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INA121U - Low-Power FET Instrumentation Amplifier | Texas Instruments
INA121U

INA121U - Low-Power FET Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA121U is a low-power, FET-input instrumentation amplifier with one channel, ±4 pA input bias current, ±450 µA quiescent current, and a 600 kHz bandwidth in an 8-pin SOIC package. According to the verified product data, it supports a wide ±2.25 V to ±18 V supply range and is specified for a -40 °C to +85 °C industrial temperature range. Its instrumentation-amplifier architecture is intended for amplifying small differential sensor signals while rejecting large common-mode voltages. An instrumentation amplifier is a specialized analog amplifier that provides differential input, high input impedance, accurate differential gain, and strong common-mode rejection. The INA121 belongs to the broader hierarchy of operational amplifiers, analog amplifiers, signal-conditioning ICs, and semiconductors. Its three-op-amp design makes it suitable for bridge sensors, current measurements, biomedical instrumentation, and industrial sensor interfaces where the common-mode voltage may be much larger than the wanted signal. Verified features include low input offset voltage of ±200 µV, low input offset drift of ±2 µV/°C, high common-mode rejection of 106 dB, and low nonlinear-ty error of 0.001%. The input-noise specification is listed as 100 nV/√Hz in the verified search data. These characteristics support precision measurement by reducing offset error, drift, common-mode interference, and amplitude distortion. The device is identified as a one-amplifier, 8-SOIC instrumentation amplifier by DigiKey. The INA121’s low-power design is useful when system power is constrained or when added analog circuitry would otherwise increase overall power consumption. The wide supply range supports both low-voltage portable systems and higher-voltage industrial interfaces, although the actual signal and output headroom must remain within the device ratings. The ±450 µA quiescent-current value is especially relevant to battery-powered and distributed sensor systems. Typical applications include strain-gauge and load-cell bridges, thermocouple and temperature-sensor front ends, low-current measurement, biomedical instrumentation, industrial process monitoring, and general differential signal conditioning. The design should provide suitable input filtering, power bypassing, gain-setting resistors, and output-voltage headroom. Pin assignment, gain calculation, and common-mode limits should be confirmed from the manufacturer datasheet before layout release. This product data consolidates the verified manufacturer description, distributor package identification, feature snippets, and sourcing links for INA121U. Pricing tiers below use the distributor value explicitly available as of 2026-10-22; the LCSC listing is for the distinct INA121U/2K5 ordering variant and is not substituted for INA121U.

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INA121UA - FET-Input Low Power INA | SOIC-8 | Texas Instruments
INA121UA

INA121UA - FET-Input Low Power INA | SOIC-8 | Texas Instruments

The Texas Instruments INA121UA is a FET-input, low-power instrumentation amplifier (INA) that delivers excellent DC accuracy for general-purpose precision signal conditioning, housed in an 8-pin SOIC (D) package. Headline specifications are 600 kHz bandwidth (G = 100), 70 kHz small-signal bandwidth at unity gain, 0.07 V/us slew rate, 4 pA maximum input bias current, and a wide +/-2.25 V to +/-18 V dual supply range. The internal three-op-amp topology is externally gain-programmed with a single resistor from 1 V/V to 10,000 V/V, eliminating the need for matched external networks. An instrumentation amplifier is a precision differential amplifier that combines high input impedance, high common-mode rejection ratio (CMRR), and user-settable gain, making it ideal for extracting small differential signals riding on large common-mode voltages. Within the signal-chain taxonomy, the INA sits between the transducer/bridge and the analog-to-digital converter (ADC), and is itself a category of analog amplifier IC that subclasses under operational amplifier ICs (op-amp IC). The INA121 specifically targets FET-input applications where source impedance is high or where bias current must be minimized to avoid error and self-heating. Key features include +/-200 uV maximum input offset voltage, +/-2 uV/degrees C input offset drift, 100 nV/sqrt(Hz) low input noise voltage density, 106 dB minimum CMRR, and a low 450 uA typical quiescent current. The device also integrates input protection that can withstand up to +/-40 V differential or common-mode overvoltages without damage, and an output stage capable of driving 1 kohm loads to within 1.5 V of either supply rail. Internally, the INA121 uses a precision thin-film resistor network with laser-trimmed matching to deliver 0.001% maximum nonlinearity at G = 100. The FET front-end keeps bias current roughly two orders of magnitude lower than bipolar-input instrumentation amplifiers such as the AD620, which simplifies thermal management of high-impedance sensor sources. Typical applications include weigh scales and load-cell bridges, ECG/biopotential front-ends, thermocouple and RTD signal conditioning, industrial process controls with 4-20 mA loops, and battery-powered portable instrumentation. The wide supply range allows direct operation from industrial +/-15 V rails as well as low-voltage single-supply configurations down to 4.5 V total. When designing with the INA121UA, place the gain-setting resistor as close as possible to the RG pins to minimize parasitic capacitance, and provide 0.1 uF ceramic bypass capacitors within 5 mm of each supply pin. For single-supply operation, reference the output to mid-rail (VREF = VS/2) and bias the input common-mode voltage above ground by at least 1 V to preserve linear operation. Compared with monolithic zero-drift alternatives, the INA121 trades chopper-stabilized offset for higher bandwidth and lower quiescent current, making it preferred when AC signal fidelity matters more than nano-volt DC accuracy. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not found on the manufacturer datasheet front page.

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INA122P - 36V Micropower Instrumentation Amplifier | TI
INA122P

INA122P - 36V Micropower Instrumentation Amplifier | TI

The Texas Instruments INA122P is a precision, low-noise instrumentation amplifier for accurate differential signal acquisition, featuring 60 µA quiescent current, operation from 2.2 V to 36 V, and an 8-pin plastic DIP package. Its two-op-amp architecture supports single- and dual-supply operation, making it suitable for portable medical equipment, data-acquisition systems, and low-level transducer interfaces. The device is designed for accurate measurement of small differential signals while maintaining low power consumption. An instrumentation amplifier is a specialized amplifier category that measures the voltage difference between two input signals while rejecting common-mode noise. INA122P belongs to the broader hierarchy of instrumentation amplifier, differential amplifier, amplifier IC, and analog signal-conditioning IC. This position allows the device to sit between a sensor and an ADC or measurement system, where weak sensor outputs must be amplified without allowing the common-mode voltage to corrupt the result. Key features include a 60 µA low quiescent current, single-supply operation up to 36 V, dual-supply operation up to ±18 V, a common-mode range extending to V− − 0.1 V, and rail-to-rail output swing. The verified manufacturer data also identifies low offset voltage, low offset drift, and low noise as important characteristics for precision measurements. These features support battery-powered and portable systems where power consumption, input range, and signal fidelity are primary design constraints. The two-op-amp design provides accurate, low-noise differential acquisition in a single integrated circuit. Unlike a general-purpose op-amp used with a manually matched resistor network, the INA122P integrates the differential signal-conditioning function and is intended for applications such as bridges, load cells, thermocouples, and other low-level transducers. The common-mode and output-swing characteristics allow the amplifier to operate near the lower supply rail, which is useful in single-supply sensor systems. Typical applications include portable medical monitoring, industrial data acquisition, battery-powered instrumentation, bridge and load-cell signal conditioning, thermocouple interfaces, and low-level sensor measurement. In each case, the device can amplify a differential sensor signal while its low quiescent current helps preserve battery life. Designers should still verify input common-mode limits, output swing, gain configuration, supply range, and external resistor or capacitor requirements against the manufacturer datasheet. A key design consideration is maintaining adequate supply headroom and correct gain-setting components. Input and output signal ranges must remain within the specified common-mode and swing limits at every temperature and load condition. Place the device close to the sensor source when possible to reduce noise pickup, and follow the manufacturer datasheet for decoupling, gain resistor selection, grounding, and input protection. This page combines the verified Texas Instruments datasheet information, distributor listing data, and application-oriented engineering guidance for engineers evaluating the INA122P. It also distinguishes exact INA122 family packaging variants from unverified substitutes, helping PCB designers avoid assuming that different packages or amplifier families are drop-in compatible.

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INA122PA - 60uA Micropower Instrumentation Amplifier, 36V | Texas Instruments
INA122PA

INA122PA - 60uA Micropower Instrumentation Amplifier, 36V | Texas Instruments

The Texas Instruments INA122PA is a single-channel, low-power instrumentation amplifier with 60 uA quiescent current, a 2.2 V to 36 V single-supply (or plus/minus 18 V dual-supply) operating range, and programmable gains from 5 V/V to 10,000 V/V, packaged in an 8-pin PDIP (P) package. It adds differential input measurement with high input impedance to low-level sensor signals while drawing very little supply current. An instrumentation amplifier (INA) is a precision differential amplifier optimized for sensing small signals buried in noise and common-mode interference. Structurally it sits above an operational amplifier, which itself sits inside the broader family of analog signal-chain amplifiers. The INA122 uses a two-op-amp architecture with excellent performance and very low quiescent current, so the hierarchy is instrumentation amplifier to difference amplifier to operational amplifier to analog IC, with the INA122 designed for portable instrumentation and data-acquisition systems. Key specifications include a low quiescent current of 60 uA, a wide power-supply range reaching 36 V on a single supply, a common-mode range of (V-) minus 0.1 V, and a rail-to-rail output swing. Input offset voltage is specified at 250 uV maximum and input offset drift at 3 uV/degC maximum, which keeps gain error and drift low at high gain settings. The device offers 120 kHz bandwidth and 90 dB common-mode rejection, so high-frequency common-mode noise and gain-bandwidth-limited signals are both well controlled. Technically, the two-op-amp topology gives a gain set entirely by one external resistor connected between the RG pins. That means the gain equation is set by a single component value rather than a matched resistor network, which simplifies calibration and keeps the design robust across temperature. Internal feedback resistors are laser trimmed, so CMRR and offset behavior stay consistent without external trimming. Typical uses include bridge and load-cell front ends, thermocouple and RTD signal conditioning, battery-powered portable medical monitors, current-shunt measurement in power supplies, and general-purpose low-level data acquisition front ends where both low quiescent current and wide supply range matter. When designing around the INA122PA, plan the RG resistor network for the lowest gain you can tolerate, place input filtering close to the pins, and note that the input common-mode range sits close to the negative rail, so the signal must remain above (V-) minus 0.1 V. Reference and supply decoupling capacitors should be placed adjacent to pins 5 and 7 for stable operation. This page consolidates manufacturer specifications, drop-in PDIP-8 alternatives, comparison data and practical design notes into one engineering reference that goes beyond a single datasheet download.

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INA122U - 36V Micropower Instrumentation Amplifier | TI
INA122U

INA122U - 36V Micropower Instrumentation Amplifier | TI

The Texas Instruments INA122U is a precision, low-power instrumentation amplifier with a 2.2 V to 36 V supply range, 60 µA typical quiescent current, and an 8-pin SOIC package. Designed for differential signal acquisition, it uses a two-op-amp architecture to provide accurate amplification of low-level sensor signals while operating from either a single supply or dual supplies. The device is suitable for portable medical instrumentation, data acquisition systems, industrial sensing, and low-power measurement equipment. What is an instrumentation amplifier? An instrumentation amplifier is a differential amplifier optimized for measuring a small voltage difference between two inputs while rejecting common-mode interference. In the signal-chain hierarchy, an instrumentation amplifier sits between a sensor and a higher-level processing circuit; it provides gain, input impedance, and common-mode rejection in one dedicated analog block. Unlike a general-purpose operational amplifier, an instrumentation amplifier is intended for differential sensing and often preserves signal integrity when large common-mode voltages are present. Key features of the INA122U include a low quiescent current of 60 µA, wide supply operation from 2.2 V to 36 V, a common-mode range extending to (V−) − 0.1 V, rail-to-rail output swing, low offset voltage of 250 µV maximum, low offset drift of 3 µV/°C maximum, and low noise. The 8-SOIC package supports conventional surface-mount assembly and is identified by DigiKey as a one-circuit instrumentation amplifier. The two-op-amp architecture provides a straightforward gain-setting network while keeping the device suitable for portable and low-power systems. The INA122U is designed for accurate, low-noise differential signal acquisition rather than high-speed waveform processing. Its supply flexibility allows operation from a compact single supply or from dual supplies up to ±18 V, depending on the application requirements. The low 60 µA quiescent current helps limit battery drain when the amplifier is part of a portable instrument. Typical applications include low-level sensor front ends, portable medical monitoring, strain and pressure measurement, battery-powered data acquisition, current sensing, and industrial process instrumentation. The device is particularly useful when a small differential signal must be amplified before conversion by an ADC. In these systems, the engineer should verify the selected gain against the input range, common-mode voltage, output swing, supply voltage, and settling requirements. The main design consideration is ensuring that the input and output signals remain within the device's electrical limits while the external gain network is selected correctly. Input filtering, proper grounding, stable reference connections, and PCB trace symmetry help preserve differential accuracy. The INA122U combines low power, flexible supply operation, and precision-oriented specifications in a compact package for portable and measurement applications. This page summarizes the verified manufacturer information, distributor listing, practical application guidance, and available comparison context for engineers evaluating INA122U. Because detailed gain-current, noise-density, bandwidth, and package-temperature data are not all present in the supplied source material, those values should be confirmed against the current Texas Instruments datasheet before final design release.

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INA122UA - 36V Micropower Instrumentation Amplifier | Texas Instruments
INA122UA

INA122UA - 36V Micropower Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA122UA is a single-supply, micropower precision instrumentation amplifier rated for supply voltages from 2.2 V to 36 V, featuring a 60 uA quiescent current, a bandwidth of 120 kHz, and an 8-pin SOIC package. Designed for differential signal acquisition, it provides low offset voltage and low offset drift while consuming minimal power. The device can operate from either a single positive supply or a dual supply, making it suitable for portable medical equipment, battery-powered instruments, and distributed data-acquisition systems. An instrumentation amplifier is a specialized analog signal-conditioning amplifier that measures the voltage difference between two inputs. Its internal differential architecture rejects common-mode interference, while programmable gain amplifies weak sensor signals before they reach an ADC. Within the broader hierarchy, the INA122UA is an instrumentation amplifier, analog amplifier, signal-conditioning IC, and power-management-compatible analog semiconductor designed for low-voltage precision acquisition. Key features include a 60 uA typical quiescent current, a wide single-supply operating range extending to 36 V, and operation from dual supplies up to plus or minus 18 V. The input common-mode range can extend approximately 0.1 V below the negative supply, and the output supports rail-to-rail swing. Maximum offset voltage is 250 uV, while maximum offset drift is 3 uV per degree Celsius, supporting stable measurements where sensor baselines change with temperature. The INA122UA uses a two-op-amp instrumentation-amplifier architecture to provide accurate, low-noise differential acquisition. Its gain is established by an external resistor, allowing the signal chain to be scaled without sacrificing input impedance or common-mode rejection. The 120 kHz bandwidth supports low-frequency industrial, biomedical, and instrumentation signals, but it is not intended for high-speed signal capture. Exact gain limits, noise density, input impedance, and common-mode rejection values require confirmation in the manufacturer datasheet. Typical applications include portable ECG and physiological-signal front ends, industrial pressure and temperature sensors, low-current transducers, laboratory measurement systems, and battery-operated data loggers. In each case, the device combines a broad supply range with low quiescent current, helping preserve battery life while accepting sensor outputs that require common-mode rejection. A key design consideration is the interaction between common-mode range, output swing, gain, and supply voltage. The input and output operating regions must remain valid during startup, sensor faults, and maximum signal excursions. Input filtering, source impedance balancing, and careful grounding are also important when offset and noise-sensitive measurements are required. This page consolidates the verified manufacturer and distributor information for the INA122UA with package guidance, pricing availability notes, application analysis, and carefully qualified replacement considerations. Because the supplied records do not include complete numerical pricing or a complete pin map, those details are identified as unavailable rather than inferred.

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INA125P - Precision Bridge Amplifier with 10V Reference | Texas Instruments
INA125P

INA125P - Precision Bridge Amplifier with 10V Reference | Texas Instruments

The Texas Instruments INA125P is a low-power, high-accuracy instrumentation amplifier with a built-in precision voltage reference, maximum input offset voltage of 250 µV, slew rate of 0.02 V/µs, bandwidth of 150 kHz, and a 16-pin plastic through-hole DIP package. It provides differential bridge amplification and excitation from one integrated circuit. An instrumentation amplifier is a precision analog amplifier optimized for measuring small differential signals while rejecting large common-mode voltages. In the signal-chain hierarchy, the INA125P belongs to the instrumentation-amplifier class, then analog signal-conditioning amplifiers, then amplifiers and integrated analog ICs. Its internal three-op-amp-style signal conditioning is particularly useful for resistive sensors whose outputs are small, differential, and referenced to a bridge supply. Key features include a low 460 µA typical quiescent current, a 10 V precision reference, sleep-mode shutdown, low input bias current, and an industrial temperature range of -40°C to +85°C. The integrated reference can excite a bridge directly, while the differential amplifier rejects common-mode voltage present on both sensor inputs. Sleep mode supports duty-cycle operation and can reduce supply demand when measurements are not continuously required. The verified distributor data identifies a 2.7 V to 36 V supply capability, while another distributor result describes operation from 1.35 V to ±18 V. The manufacturer describes the device as usable in single-supply or dual-supply arrangements, subject to the detailed datasheet limits. The 150 kHz bandwidth and 0.02 V/µs slew rate support low-to-moderate-frequency measurements where fast settling is less important than low offset and low power. Typical uses include load-cell signal conditioning, strain-gauge bridge measurements, pressure-transducer interfaces, industrial weighing systems, and portable sensor instrumentation. The internal 10 V reference is particularly valuable when the sensing bridge needs excitation and a compact analog front end is preferred. When designing around the INA125P, check the selected gain, reference configuration, supply voltage, input common-mode range, and output swing against the manufacturer datasheet. Decoupling capacitors should be placed close to the supply pins, and the sensor return should be connected with care to preserve differential accuracy. The 16-pin DIP package is through-hole and is not mechanically interchangeable with the SO-16 variant. This page consolidates verified manufacturer and distributor information, package distinctions, application guidance, pricing context, and replacement-search results. It distinguishes confirmed drop-in evidence from unavailable alternatives rather than presenting unverified substitutions.

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INA125PA - 10V Reference Bridge Amplifier | Texas Instruments
INA125PA

INA125PA - 10V Reference Bridge Amplifier | Texas Instruments

The Texas Instruments INA125PA is a single-channel instrumentation amplifier with an integrated 10 V precision voltage reference, differential input amplification, and bridge-excitation capability in a 16-pin PDIP package. It supports externally selected gains from 4 to 10,000, operates from 1.35 V to 18 V, and provides a typical bandwidth of 150 kHz. The device is designed for low-power measurement systems requiring accurate amplification of small differential signals. An instrumentation amplifier is a specialized amplifier IC that converts a low-level differential signal into a single-ended or differential output. Its internal architecture rejects common-mode noise while amplifying the voltage difference between two inputs. In the power-management and signal-chain hierarchy, an instrumentation amplifier is an amplifier IC used for sensor-interface, bridge-measurement, and precision signal-conditioning applications. The INA125 adds an internal voltage reference capable of exciting resistive sensor bridges. The INA125PA provides a low quiescent current of 460 µA, a maximum low-frequency offset voltage of 250 µV, and maximum offset drift of 2 µV/°C. Its precision voltage reference is fixed at 10 V. A single external resistor sets the gain, allowing gains from 4 to 10,000 while avoiding the need for a resistor network. Low offset, low drift, and low power consumption make the device useful for battery-powered and precision industrial equipment. Internally, the amplifier combines a precision gain stage with an integrated reference and low-noise input network. The high gain range supports resistive bridges with relatively small differential outputs, while the 150 kHz bandwidth covers many temperature, pressure, force, and position sensing applications. Because this is athrough-hole PDIP device rather than a surface-mount package, it is especially convenient for prototype boards, educational instruments, legacy industrial controls, and repair assemblies. Typical uses include Wheatstone bridge excitation and measurement, load-cell signal conditioning, industrial pressure transducers, portable measurement instruments, and low-power sensor interfaces. The 10 V reference can bridge suitable high-impedance resistive networks, but the bridge and input network must remain within the device's supply, common-mode, and electrical limits. The broad gain range also permits direct measurement of small millivolt-level signals without a separate front-end amplifier. Designers should place the gain-setting resistor close to the gain resistor pins and use a stable, low-temperature-coefficient resistor when gain accuracy matters. Input filtering should preserve the required bandwidth, while supply bypassing should use short, low-inductance connections. Because the INA125PA includes a precision reference, designers must account for reference current loading when the 10 V output is used to power external circuitry. This page consolidates verified manufacturer and distributor information, explicit data gaps, practical design guidance, and a careful same-package replacement assessment. The supplied sources establish the INA125PA's core functionality but do not provide five verified pin-to-pin alternatives, so the replacement list is intentionally limited rather than padded with electrically different or differently packaged parts.

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INA125U - Precision Bridge Amplifier, 10V Ref | Texas Instruments
INA125U

INA125U - Precision Bridge Amplifier, 10V Ref | Texas Instruments

The Texas Instruments INA125U is a low-power, high-accuracy instrumentation amplifier with a precision 10V voltage reference, user-selectable gain from 4 to 10,000, and a 16-pin SOIC package. It combines bridge excitation and differential-input amplification on one integrated circuit, making it suitable for strain-gauge, pressure-transducer, and other bridge-sensor signal chains. An instrumentation amplifier is a specialized differential amplifier designed for sensors whose useful output is small and appears across two input terminals. Its internal architecture provides high input impedance, accurate differential gain, and strong common-mode rejection. The INA125 adds a precision reference output, allowing a bridge circuit to be excited and its output measured relative to a stable midpoint. The INA125U offers a 2.7V to 36V supply range, low 460µA quiescent current, maximum 250µV input offset voltage, maximum 2µV/°C offset drift, and a sleep mode. A single external resistor sets the gain, while the integrated amplifier can provide 150kHz bandwidth according to the retrieved product data. These features balance precision, power consumption, and measurement speed for portable and industrial instrumentation. Electrically, the device is intended for bridge outputs and other low-level differential sources. Input common-mode range, reference accuracy, gain error, and maximum input voltage must be checked against the actual bridge excitation and sensor output. The SOIC package also requires careful attention to ground return paths and supply decoupling when low-level signals are measured. Typical uses include quarter-bridge and full-bridge strain sensors, load-cell front ends, pressure and force measurement, biomedical instrumentation, industrial process controls, and precision data-acquisition systems. The 10V reference can simplify excitation when the sensor and measurement chain require a defined bridge supply. The most important design consideration is preserving common-mode and differential signal integrity. Place input and reference grounding deliberately, use low-noise supply bypass capacitors, and verify that the selected gain resistor stays within its recommended range. This page combines verified manufacturer and distributor information with practical application guidance and explicit data gaps rather than estimating unprovided specifications.

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INA125UA - Precision Bridge Instrumentation Amplifier | TI
INA125UA

INA125UA - Precision Bridge Instrumentation Amplifier | TI

The Texas Instruments INA125UA is a low-power, high-accuracy instrumentation amplifier with an integrated precision voltage reference, one differential input channel, and a 16-pin SOIC package. A single external resistor sets the gain from 4 to 10,000 V/V, while the integrated bridge excitation and reference circuitry support complete sensor-conditioning solutions in one IC. An instrumentation amplifier is a specialized analog signal-conditioning IC designed to amplify small differential voltages while rejecting common-mode interference. Its functional hierarchy is instrumentation amplifier, differential amplifier, analog front end, and signal-conditioning IC. This device is particularly useful when a sensor produces a small differential output and the measurement environment contains noise, ground-potential differences, or substantial common-mode voltage. The INA125UA combines differential-input amplification, adjustable gain, bridge excitation, and a precision voltage reference in one package. Its gain range of 4 to 10,000 V/V allows the same device family to serve strain-gauge, pressure-sensor, and resistive-bridge systems. The single-resistor gain-setting arrangement simplifies calibration and reduces the number of external components required for many precision measurement circuits. The device is laser-trimmed for accuracy, and the family operates across a supply range of 2.7 V to 36 V. The INA125UA ordering option is supplied in a 16-pin SOIC package for surface-mount assembly. The integrated reference can support excitation or output-referencing requirements where an external precision reference would otherwise increase component count and introduce another error source. Typical uses include strain-gauge load cells, resistive pressure and temperature sensors, current-shunt instrumentation, industrial process monitoring, and precision laboratory measurement systems. It is especially appropriate when differential signal integrity, adjustable gain, and integrated bridge excitation are needed within one analog front end. The wide supply range also allows operation from low-voltage portable systems through higher-voltage industrial measurement equipment. Designers should follow the TI datasheet for the exact gain-resistor equation, reference-output behavior, input and output range, supply decoupling, and common-mode limitations. Place bypass capacitors close to the supply pins, keep sensitive differential routes compact and symmetric, and verify that transducer excitation, input common-mode voltage, output swing, and gain remain within their permitted operating limits. This page organizes the INA125UA specifications, pin package, application guidance, comparison parameters, and drop-in alternatives. It also identifies the engineering trade-offs between same-footprint family members and provides sourcing workflows for price, availability, and lead-time requests.

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INA126P - 36V MicroPower Precision INA | Texas Instruments
INA126P

INA126P - 36V MicroPower Precision INA | Texas Instruments

The Texas Instruments INA126P is a precision micropower instrumentation amplifier rated for a 36 V maximum supply, with 175 µA quiescent current, 250 µV input offset voltage, and gain values set by an external resistor. It is supplied in an 8-pin PDIP package for through-hole industrial, portable, and measurement-instrumentation designs. An instrumentation amplifier is a differential analog-front-end IC that amplifies the voltage difference between two inputs while rejecting common-mode interference. INA126 belongs to the instrumentation-amplifier hierarchy within operational amplifiers and analog signal-chain ICs. Its two-op-amp architecture supports accurate, low-noise acquisition from sensors, bridges, and low-level transducers, especially where power consumption and input precision are important. The verified features include 250 µV offset, 175 µA typical quiescent current, and operation from ±1.35 V to ±18 V, corresponding to a stated 36 V maximum supply condition. The INA126 family also provides programmable gains of 1, 10, 100, or 1000 through the external gain resistor. These values make it suitable for battery-powered instrumentation, industrial measurement, portable diagnostics, and sensor interfaces where common-mode rejection and low bias current are more valuable than wide bandwidth. The device uses a two-op-amp internal architecture rather than a three-op-amp topology, helping keep power consumption low. Because the gain depends on the external resistor and its matching, PCB resistor placement, source impedance balance, input filtering, grounding, and reference-connection practices directly influence accuracy. The 8-pin PDIP package is mechanically straightforward for through-hole assembly but requires adequate lead spacing and clean soldering practice. Typical applications include bridge-based pressure and load measurement, low-level sensor conditioning, portable medical or industrial instrumentation, battery-operated data acquisition, and differential signal acquisition where a precision offset and low supply current are required. For single-supply systems, the output-reference arrangement must be designed to keep the output within the input and output common-mode limits. The principal design trade-off is the relatively modest micropower-focused feature set versus higher-bandwidth or lower-noise instrumentation amplifiers. Confirm supply voltage, input range, gain resistor, output swing, reference connection, and common-mode limits against the manufacturer datasheet before committing a PCB design. This page combines verified manufacturer and distributor information with design guidance, selection criteria, and same-package comparison context for engineers evaluating the INA126P.

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INA126PA - 36V Micropower Instrumentation Amplifier | TI
INA126PA

INA126PA - 36V Micropower Instrumentation Amplifier | TI

The Texas Instruments INA126PA is a single-channel, precision micropower instrumentation amplifier with a 36 V maximum supply rating, 250 µV input offset voltage, 175 µA quiescent current per channel, and an 8-pin PDIP package. It is designed to acquire accurate, low-noise differential signals while consuming very little power. The two-operating-amplifier architecture supports common-mode rejection and differential signal conditioning in compact, portable, and industrial instrumentation systems. An instrumentation amplifier is a specialized amplifier category used to amplify the difference between two input signals while rejecting common-mode voltage. Within the amplifier hierarchy, an instrumentation amplifier is a precision analog amplifier, while an operational amplifier is a more general-purpose building block. The INA126PA belongs to the micro-power instrumentation-amplifier family and combines differential input measurement, adjustable gain, and low bias current in one integrated circuit. The principal advantages are low power consumption, low offset voltage, a wide operating-supply range of ±1.35 V to ±18 V, and operation from a single supply down to 2.7 V. According to the manufacturer datasheet, the device uses 175 µA per channel and provides a gain adjustment range of 1 V/V to 1000 V/V. These characteristics suit battery-powered and portable measurement systems where amplifier power can materially affect available operating time. The INA126PA uses a two-operating-amplifier architecture for accurate, low-noise differential-signal acquisition. Its instrumentation-amplifier function is useful when the wanted signal is smaller than the voltage shared by both input nodes. The low 175 µA quiescent current is particularly important in portable instrumentation and data-acquisition systems, while the 250 µV offset specification supports precision measurement of small differential voltages. Typical applications include portable sensor acquisition, industrial process measurement, battery-operated diagnostic equipment, low-current transducers, and differential voltage sensing. In each case, the device can condition a low-level differential input before it reaches an ADC or another signal-processing stage. Its single- and dual-supply flexibility allows it to be used with compact analog systems operating from low-voltage sources as well as higher-voltage industrial rails. Designers should verify the exact gain-setting resistor against the manufacturer gain table and preserve the input and reference-pin arrangements shown in the datasheet. The reference input should be connected to a defined low-impedance voltage, and unused inputs must not be allowed to float. PCB layout should keep the gain-setting resistor close to the device to minimize added noise and instability in sensitive measurement circuits. This product page consolidates verified manufacturer and distributor information, lifecycle guidance, package details, replacement analysis, and practical design guidance. It also distinguishes verified drop-in candidates from changes requiring a different package, helping engineers avoid confusing functional equivalence with literal PCB-level replaceability.

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INA126U - 36V Micropower Instrumentation Amp | Texas Instruments
INA126U

INA126U - 36V Micropower Instrumentation Amp | Texas Instruments

The Texas Instruments INA126U is a single-circuit micropower precision instrumentation amplifier rated for a 36 V total supply, with 175 µA quiescent current per channel, 250 µV offset, and an 8-pin SOIC package. Its differential-input architecture supports accurate, low-noise signal acquisition where common-mode interference, source impedance mismatch, and power consumption must all be controlled. An instrumentation amplifier is a specialized amplifier and the final member of the signal-chain hierarchy: sensor output → differential input → instrumentation amplifier → ADC or measurement system. Unlike a general-purpose operational amplifier, an instrumentation amplifier internally supports high input impedance and accurate differential gain, reducing errors when both inputs originate from balanced sensors, resistive bridges, or shunt measurements. The INA126 family uses a two-op-amp architecture optimized for precision and micropower operation. Verified headline features include a 36 V maximum supply, 175 µA per-channel quiescent current, and 250 µV offset. The manufacturer describes the device for accurate, low-noise differential-signal acquisition across a wide operating voltage range of ±1.35 V to ±18 V. These properties suit portable instruments and low-power acquisition systems where battery energy is limited but input-referred accuracy remains important. The single amplifier in the INA126U also avoids the extra power and board area associated with an unnecessary dual channel. The INA126U can be configured through an external gain-setting resistor. Because its instrumentation-amplifier architecture rejects common-mode signals before they reach the output, it is particularly useful when the wanted differential signal is much smaller than the voltage shared by both inputs. Designers must still verify input and output common-mode limits, maximum differential input voltage, gain-bandwidth behavior, resistor tolerance, output swing, and the sensor output range for the intended supply voltage. Precision performance ultimately depends on resistor matching and careful grounding as well as the amplifier itself. Typical uses include battery-powered sensor interfaces, portable measurement instruments, current-shunt amplifiers, bridge-signal conditioning, and low-power data-acquisition front ends. The 175 µA per-channel quiescent current is particularly useful where idle current directly affects battery life. The 250 µV offset specification gives designers a defined input-referred error reference, while the 36 V supply capability supports higher-voltage industrial systems when the individual input and output ranges are observed. For PCB implementation, keep the external gain resistor close to the gain-setting pins, use a stable low-noise reference plane, and place input-protection capacitance only after checking its effect on bandwidth and transient response. Avoid long parallel input traces, maintain symmetric routing where practical, and provide local supply bypassing. Verify common-mode headroom at worst-case sensor voltage and load current rather than relying only on nominal supply conditions. This page combines verified manufacturer facts, distributor pricing, same-package alternatives, and application-oriented design guidance. It also distinguishes documented values from parameters requiring confirmation from the complete manufacturer datasheet, helping engineers move from component selection to a defensible low-power sensor-board design.

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INA126UA - 36V Precision MicroPower Instrumentation Amplifier | TI
INA126UA

INA126UA - 36V Precision MicroPower Instrumentation Amplifier | TI

The Texas Instruments INA126UA is a single-channel precision instrumentation amplifier with a 36 V maximum supply, 175 µA quiescent current per channel, 250 µV input offset voltage, and an 8-pin SOIC package. It is designed for accurate, low-noise differential-signal acquisition where low power consumption and high common-mode rejection are important. An instrumentation amplifier is a differential-input amplifier optimized for measuring small signals embedded in larger common-mode voltages. Its internal gain stage rejects common-mode noise and converts the differential difference between two inputs into a single-ended output. The INA126 belongs to the broader hierarchy of instrumentation amplifier, precision amplifier, analog signal-conditioning IC, and semiconductor. The INA126UA uses a two-op-amp architecture with external gain-setting resistors. Its precision input offset voltage supports accurate bridge, current-sense, and sensor measurements, while the 175 µA per channel quiescent current suits battery-powered and portable equipment. The 250 µV input offset specification is particularly useful when the measured differential signal is small relative to the allowed error. The device supports supply voltages from 2.7 V to 36 V total, corresponding to the documented operating range of ±1.35 V to ±18 V. Its 200 kHz bandwidth suits relatively slow precision measurements rather than high-speed waveform capture. The two-op-amp topology balances low noise and low quiescent current with a practical gain-setting arrangement using an external resistor. Typical uses include strain-gauge and RTD signal conditioning, low-side current measurement, bridge excitation, biomedical instrumentation, and portable sensor acquisition. For bridge-based sensors, the instrumentation amplifier rejects ground offsets and common-mode interference before the signal reaches an ADC. For battery-powered systems, the 175 µA per channel current helps limit standby consumption. Choose the INA126UA when the design requires a precision single-channel amplifier with an 8-pin SOIC footprint and very low quiescent current. Verify the selected gain, output swing, supply voltage, bandwidth, and output-reference arrangement against the manufacturer datasheet. Input and reference pins should be routed away from switching nodes and noisy return currents. This page combines device specifications, verified drop-in alternatives, application guidance, package details, and selection trade-offs to help engineers evaluate the INA126UA before circuit implementation.

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INA128HD - 130dB CMRR Low-Power Instrumentation Amplifier | TI
INA128HD

INA128HD - 130dB CMRR Low-Power Instrumentation Amplifier | TI

The Texas Instruments INA128HD is a precision, low-power instrumentation amplifier with 130 dB CMRR, 700 µA typical quiescent current, and a 1.3 MHz gain-bandwidth product, housed in an 8-pin SOIC package. It accepts input protection to ±40 V, supports supply voltages up to ±18 V, and uses one external resistor to set gain from 1 to 10,000. The INA128HD is the high-temperature member of the INA128-HT family and is intended for precision bridge, sensor, and low-level differential-signal measurement. An instrumentation amplifier is a specialized amplifier that amplifies the voltage difference between two inputs while rejecting signals common to both inputs. This three-operational-amplifier architecture belongs to the broader measurement-amplifier and analog-signal-conditioning hierarchy. It is especially useful when a small sensor voltage is mixed with a larger common-mode voltage and the measurement requires high input impedance, accurate differential gain, and low output offset. Key characteristics include 25 µV typical offset voltage, 93 dB minimum CMRR at gain settings of 100 or higher, a 4 V/µs slew rate, and a gain equation based on a 49.4 kΩ gain-setting resistor. Input bias current is listed as 50 nA typical. These features allow the INA128HD to preserve small differential signals while rejecting power-supply ripple, ground offsets, and other common-mode disturbances. The INA128 uses a current-feedback input stage to maintain usable bandwidth at higher closed-loop gains. A single resistor between the gain-setting terminals establishes the desired gain, while the internal amplifier stages provide differential sensing and single-ended output. The manufacturer describes the INA128-HT as a laser-trimmed design with low offset and high CMRR, making it appropriate for precision analog front ends where gain accuracy and signal purity are more important than minimum cost. Typical uses include Wheatstone bridge sensing, pressure and force measurement, biomedical instrumentation, industrial sensor acquisition, and low-level differential receiver circuits. The 8-pin SOIC package is also practical for high-density analog boards, although the specified operating temperature range and total input error should be checked against the mechanical and environmental requirements of the target equipment. For PCB design, place the gain resistor close to pins 1 and 8 to minimize parasitic resistance and instability. Keep input and reference-node routing away from switching nodes and high-current return paths. Check the maximum differential input voltage, common-mode range, supply limits, and output swing in the manufacturer datasheet before finalizing the sensor interface. This product page combines manufacturer specifications, sourcing guidance, application analysis, and same-package drop-in comparisons. It also highlights practical PCB and signal-integrity considerations that help engineers evaluate the INA128HD beyond a basic parametric component listing.

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INA128P - 130dB CMRR Precision INA | Texas Instruments
INA128P

INA128P - 130dB CMRR Precision INA | Texas Instruments

The Texas Instruments INA128P is a precision, low-power instrumentation amplifier with 130 dB CMRR, a 700 µA quiescent current, and an 8-pin PDIP package. It provides 50 µV maximum offset voltage, 0.5 µV/°C maximum offset drift, 5 nA maximum input bias current, and 1.3 MHz bandwidth. The device accepts supply voltages from ±2.25 V to ±18 V and supports input protection to ±40 V. An instrumentation amplifier is a specialized amplifier-IC category designed to amplify small differential sensor signals while rejecting common-mode interference. INA128P belongs to the instrumentation-amplifier hierarchy, which also includes differential amplifiers and analog front ends for measurement systems. Its three-op-amp architecture provides accurate differential gain, high input impedance, and flexible gain selection with an external resistor. Key features include a low offset voltage of 50 µV maximum and low offset drift of 0.5 µV/°C maximum. The 130 dB CMRR figure minimizes errors when a sensor signal is small relative to its common-mode voltage. Current-feedback input circuitry preserves bandwidth at higher gain, including 200 kHz bandwidth at a gain of 100. Input bias current remains low at 5 nA maximum, which is valuable for high-impedance sensors. The INA128P uses a versatile three-op-amp instrumentation-amplifier architecture and is available in an 8-pin plastic DIP package. Its ±2.25 V to ±18 V supply range supports dual-supply analog systems and higher-voltage industrial interfaces. The specified operating temperature range is -40 °C to +85 °C. The low 700 µA quiescent current helps reduce power consumption in portable and low-power measurement equipment. Typical applications include bridge and strain-gauge signal conditioning, current measurement, biomedical instrumentation, industrial sensor interfaces, precision data acquisition, and laboratory measurement systems. The device is particularly suitable when common-mode rejection and low offset are more important than very high bandwidth. The manufacturer datasheet also identifies current-feedback input circuitry for improved high-gain bandwidth. When designing around INA128P, choose the external gain resistor carefully because it determines gain accuracy and stability. Keep input and feedback routing compact, observe the specified supply limits, and verify common-mode voltage, input protection, and output-swing requirements against the actual sensor and measurement chain. The INA128P is not a power semiconductor, so safe-operating-area data is not applicable. This page combines verified manufacturer specifications, distributor availability information, cross-reference results, and practical design guidance for engineers evaluating precision sensor-signal conditioning.

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INA128PA - 130dB CMRR Low-Power INA | Texas Instruments
INA128PA

INA128PA - 130dB CMRR Low-Power INA | Texas Instruments

The Texas Instruments INA128PA is a precision, low-power instrumentation amplifier with 130 dB CMRR, 700 µA quiescent current, and an 8-pin PDIP package. It uses a versatile three-op-amp architecture to amplify small differential signals while rejecting common-mode interference. Its specified low offset voltage, low drift, low bias current, wide supply range, and protected inputs make it suitable for precision measurement systems. The device supports gains from 1 through 10,000 using one external gain-setting resistor and retains useful bandwidth at high gain. An instrumentation amplifier is a specialized analog amplifier optimized for measuring low-level differential signals in the presence of large common-mode voltages. Its internal three-op-amp arrangement provides high input impedance, accurate differential gain, and strong common-mode rejection without requiring matched external resistors. INA128PA belongs to the instrumentation-amplifier hierarchy, which sits within signal-conditioning and amplifier ICs used in instrumentation, industrial control, biomedical measurement, and test equipment. Verified features include a maximum input offset voltage of 50 µV, maximum input voltage drift of 0.5 µV/°C, maximum input bias current of 5 nA, minimum CMR of 120 dB, input protection to ±40 V, and a supply range up to ±18 V. The low quiescent current is 700 µA, making the device suitable for power-conscious precision analog systems. According to the verified TI product data, the INA128 family provides 200 kHz bandwidth at a gain of 100. The three-op-amp internal design uses current-feedback input circuitry to preserve bandwidth as gain increases. This architecture is important when the measured signal is small and the source impedance is not negligible: the low 5 nA maximum bias current reduces loading of high-resistance sensors. The 130 dB CMRR specification helps reject common-mode voltage produced by motor systems, mains-coupled noise, or long sensor cables. Typical uses include precision current sensing, bridge-transducer amplification, biomedical instrumentation, portable measurement, laboratory equipment, and industrial process monitoring. The part can operate from dual or single supplies as supported by the family documentation, but the exact operating modes and output-swing limits should be checked against the manufacturer datasheet before final design release. For PCB implementation, keep the gain resistor close to the gain-setting pins and use a quiet ground return for the signal path. Input filtering, common-mode voltage limits, output settling, and supply decoupling must be evaluated for the target gain and bandwidth. Do not assume that the protected input rating removes the need for external transient protection in every system. This page combines verified manufacturer and distributor information, package-specific identification, application guidance, and cautious replacement analysis. Values not explicitly verified in the supplied data remain marked for engineering review rather than estimated.

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INA128U - 130dB CMRR Precision Instrumentation Amplifier | TI
INA128U

INA128U - 130dB CMRR Precision Instrumentation Amplifier | TI

The Texas Instruments INA128U is a precision, low-power, three-op-amp instrumentation amplifier with 130 dB CMRR, a 700 µA quiescent current, and an 8-pin SOIC package. It operates from ±2.25 V to ±18 V, supports gains from 1 to 100,000 through an external gain-setting resistor, and is designed for measuring small differential signals superimposed on large common-mode voltages. An instrumentation amplifier is a differential amplifier optimized for sensors and balanced signal chains. Its internal three-op-amp architecture provides high input impedance and accurate differential gain, making it more practical than connecting a general-purpose op amp directly to a balanced source. Within the signal-processing hierarchy, an instrumentation amplifier is a specialized amplifier IC, while the INA128U also belongs to the broader precision analog and low-power signal-conditioning family. Key characteristics include a maximum input offset voltage of 50 µV, maximum offset drift of 0.5 µV/°C, maximum input bias current of 5 nA, and input protection to ±40 V. Current-feedback input circuitry maintains useful bandwidth at higher gain, including approximately 200 kHz at a gain of 100. The low 700 µA supply consumption supports battery-powered and portable measurement systems where amplifier power can materially affect operating time. The INA128U uses an external resistor to establish gain, simplifying programming when only one gain is required. Its three-op-amp topology offers accurate gain control and strong common-mode rejection, but requires adequate layout discipline around high-impedance inputs and the gain resistor. Input and output filtering must be selected carefully because excessive capacitance can affect stability or reduce usable bandwidth. Typical applications include bridge-transducer and pressure-sensor interfaces, precision current measurement, biomedical instrumentation, industrial process monitoring, and low-level differential sensing. The INA128U is particularly appropriate where a small sensor signal must be measured accurately in the presence of a much larger common-mode voltage and where low quiescent current is more important than very high bandwidth. For reliable operation, keep input and gain-resistor connections short, provide adequate input and output decoupling, and verify stability with the actual source impedance and cable capacitance. If the input can exceed the supply rails, use the specified protection method rather than assuming ordinary op-amp input clamps can safely absorb the applied voltage. The effective system accuracy also depends on resistor tolerance and temperature coefficient. This product record combines verified manufacturer specifications, distributor references, package and sourcing information, alternative-part analysis, and application guidance. It is intended to help engineers locate the datasheet, compare genuine same-package choices, estimate fit, and identify the design details that are not visible from a distributor listing alone.

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INA128UA - 130dB CMRR Low-Power Instrumentation Amplifier
INA128UA

INA128UA - 130dB CMRR Low-Power Instrumentation Amplifier

The Texas Instruments INA128UA is a precision, low-power instrumentation amplifier with 130 dB CMRR, 700 uA quiescent current, and 1.3 MHz gain-bandwidth performance in an 8-pin SOIC package. Maximum input offset voltage is 50 uV, while input bias current is limited to 5 nA, making the device suitable for precision sensor-signal conditioning. An instrumentation amplifier is a specialized amplifier that amplifies the difference between two input signals while rejecting common-mode interference. Its internal three-op-amp architecture provides high input impedance, controlled differential gain, and strong common-mode rejection. In the power-management hierarchy, the INA128 belongs to the amplifier IC category, where it converts low-level differential sensor outputs into stable signals suitable for measurement, conversion, or control systems. Key characteristics include an externally adjustable gain from 1 to 10,000 V/V, input protection to ±40 V, and operation across dual supplies of ±2.25 V to ±18 V. The 130 dB CMRR suppresses common-mode noise from sensors and long cables, while the 50 uV maximum offset limits measurement error. Its 700 uA quiescent current also makes it appropriate for compact, low-power instrumentation. The INA128 uses a versatile three-op-amp architecture with current-feedback input circuitry. This structure supports usable bandwidth even at high gain, including approximately 200 kHz at a gain of 100. A precision gain-setting resistor between the RG pins establishes the differential gain, allowing the same device family to serve bridge, current-shunt, and general differential-signal applications. Typical uses include precision bridge transducers, strain-gauge sensing, medical instrumentation, industrial process-control equipment, and low-level current measurement. The ±40 V input protection rating can simplify protection around sensor inputs, although system designers must still maintain appropriate common-mode and supply operating limits. Designers should keep the gain resistor close to the RG pins, provide stable reference and supply bypassing, and check input and output common-mode ranges at the intended gain. Input bias-current errors, source-imbalance effects, resistor tolerance, and printed-circuit-board leakage should be included in the error budget for precision measurements. This page combines manufacturer specifications, package and pin information, drop-in replacement guidance, comparative parameters, and application-focused engineering guidance to support component selection, PCB implementation, and precision signal-chain design.

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INA129A - Precision Instrumentation Amplifier | Texas Instruments
INA129A

INA129A - Precision Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA129A is a precision, low-power instrumentation amplifier packaged in an 8-pin SOIC. It offers excellent accuracy for general-purpose signal conditioning, with low offset voltage, low drift, low input bias current, high common-mode rejection, and input protection to ±40 V. Its versatile three-op-amp architecture supports externally set gains and current-feedback input circuitry that maintains wide bandwidth even at high gain, including 200 kHz at a gain of 100. An instrumentation amplifier is a specialized amplifier that amplifies the difference between two input signals while rejecting common-mode voltage and providing high input impedance. The INA129A belongs to the broader precision analog signal-conditioning hierarchy: instrumentation amplifier, differential amplifier, analog amplifier, and semiconductor. It is used where sensors, transducers, strain gauges, bridge circuits, and measurement front ends require accurate differential amplification with minimal disturbance to the source. The INA129 family is designed for low-power precision applications. A single external resistor sets the gain from 1 to 10,000, according to the manufacturer product information. The device provides a wide supply range of ±18 V, a minimum common-mode rejection of 120 dB, input bias current of 5 nA maximum, and input protection to ±40 V. Its current-feedback input stage is particularly useful in higher-gain designs because it preserves bandwidth better than a conventional voltage-feedback input arrangement. The INA129A can amplify low-level sensor signals in industrial measurement systems, bridge-based load cells, biomedical instrumentation, audio equipment, and data-acquisition systems. Its common-mode rejection helps suppress equal voltages appearing on both inputs, while high input impedance limits loading of the measured source. The ±40 V input protection provides additional robustness when connected to external wiring or larger transients, subject to the complete datasheet ratings and system design limits. When using INA129A, place the gain-setting resistor close to the appropriate gain pins and keep input and feedback traces short to reduce parasitic capacitance and noise pickup. Check supply decoupling, input common-mode range, output swing, and resistor tolerance before finalizing a design. Because the INA129A is a precision analog amplifier, grounding, shielding, clean references, and careful PCB layout can matter as much as nominal gain accuracy. This product page combines the verified INA129A electrical and physical details, manufacturer and distributor references, comparison parameters, and practical design guidance. The listed alternatives are limited to candidates supported by the supplied cross-reference data; package and pin compatibility should still be confirmed against the current manufacturer datasheet before substitution.

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INA129P - Precision Low-Power 8-Pin Instrumentation Amp | TI
INA129P

INA129P - Precision Low-Power 8-Pin Instrumentation Amp | TI

The Texas Instruments INA129P is a precision, low-power instrumentation amplifier with one amplifier circuit, 120 dB minimum common-mode rejection, 50 uV maximum offset voltage, and a 200 kHz bandwidth at gain 100, packaged in an 8-pin PDIP. It accepts signals within the low-noise, low-offset instrumentation-amplifier class and supports wide bipolar supply operation up to ±18 V. An instrumentation amplifier is a specialized analog amplifier that measures a small differential voltage while rejecting common-mode interference. Its internal three-op-amp architecture supports high input impedance and adjustable gain, making it useful when a sensor produces a low-level signal and the surrounding wiring introduces substantial common-mode voltage. The INA129P is therefore positioned between a general-purpose operational amplifier and a more specialized precision measurement amplifier. Key features include 50 uV maximum offset voltage, 0.5 uV/°C maximum offset drift, 5 nA maximum input bias current, and input protection to ±40 V. The single external gain-setting resistor provides gain adjustment from 1 through 10,000 according to the manufacturer family information, while current-feedback input circuitry maintains useful bandwidth at higher gain. The stated 200 kHz bandwidth at gain 100 makes the device suitable for sensor and instrumentation signal paths rather than only static measurement. The INA129P uses a low-power instrumentation-amplifier architecture intended for precision measurement systems. Its common-mode rejection helps suppress voltage common to both inputs, and the low offset and drift reduce measurement error in bridge, current, and industrial sensor applications. The ±18 V supply capability provides flexibility for dual-supply analog systems, while the 8-pin PDIP format supports through-hole assembly and prototyping. Typical uses include bridge and load-cell signal conditioning, industrial process measurement, biomedical instrumentation, current sensing, and precision test equipment. The ±40 V input protection specification is useful when the amplifier is positioned near sensor wiring, although system-level protection and operating conditions still require engineering review. The principal design consideration is ensuring that the external gain resistor, supply bypassing, input protection, and common-mode range are matched to the sensor. For a new design, verify the exact INA129P pinout and electrical limits against the current Texas Instruments datasheet before layout release. This page consolidates verified distributor snippets, manufacturer family information, package details, and application guidance, while distinguishing documented specifications from information that requires design-team verification.

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INA129PA - Precision Low-Power Instrumentation Amplifier | TI
INA129PA

INA129PA - Precision Low-Power Instrumentation Amplifier | TI

The Texas Instruments INA129PA is a precision, low-power instrumentation amplifier in an 8-pin plastic DIP package, with a maximum input offset voltage of 50 uV, maximum offset drift of 0.5 uV/degC, maximum input bias current of 5 nA, and minimum common-mode rejection of 120 dB. Its input stage tolerates voltages from -40 V to +40 V, while its supply range extends to plus or minus 18 V. These characteristics make it appropriate for precision signal conditioning where low offset, low drift, high common-mode rejection, and input protection are important. An instrumentation amplifier is a differential analog IC used to amplify the voltage difference between two inputs while rejecting signals common to both inputs. The INA129 belongs to the broader instrumentation-amplifier, amplifier-IC, and analog-semiconductor hierarchy. Its internal gain-setting arrangement supports precise amplification of small differential signals in sensor interfaces, industrial measurement systems, and laboratory equipment. The verified device features distinguish the INA129 from ordinary general-purpose operational amplifiers. A 50 uV maximum input offset voltage reduces the effect of input-referred mismatch, while the 0.5 uV/degC maximum drift limits offset variation with temperature. Maximum input bias current of 5 nA is especially relevant when the source impedance is high. Minimum CMRR of 120 dB suppresses common-mode interference, and the -40 V to +40 V input protection range helps the interface tolerate larger external voltages than the internal operating range. The INA129 supports a wide supply range of plus or minus 18 V. A wide operating range allows the amplifier to process signals within systems using higher-voltage rails while retaining the low-power characteristics highlighted for this device. Exact gain, bandwidth, quiescent-current, input-voltage, and output-voltage limits were not available in the supplied verified data and should be taken from the manufacturer datasheet before final design release. Typical uses include bridge-sensor interfaces, current-shunt measurement, precision data acquisition, industrial process monitoring, and low-level differential signal conditioning. For bridge or shunt circuits, the 120 dB minimum CMRR helps reject common-mode noise, while low offset voltage and drift reduce measurement error. The protected inputs may improve robustness when transients or nearby switching nodes can appear at the input terminals. Designers should verify the gain equation, external resistor value, permissible input and output swing, and supply-current limits against the current manufacturer datasheet. Input filtering, source-impedance balancing, grounding, and placement near the measured signal are also important because excessive imbalance can degrade CMRR and the low-offset performance expected from this precision device. This page combines verified manufacturer and distributor information with practical selection guidance, application analysis, pricing context, and verified drop-in alternatives. It distinguishes documented INA129PA characteristics from information that remains unavailable, helping engineers make a more reliable instrumentation-amplifier choice without inventing specifications.

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INA129PG4 Precision Instrumentation Amplifier | Texas Instruments
INA129PG4

INA129PG4 Precision Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA129PG4 is a precision, low-power instrumentation amplifier rated for a 700 µA supply current, 1.3 MHz gain-bandwidth product, and 8-PDIP package. It provides a 120 dB minimum common-mode rejection ratio, a 50 µV maximum offset voltage, and a 5 nA maximum input bias current for accurate differential-signal conditioning. An instrumentation amplifier is a specialized amplifier category designed to amplify the difference between two input signals while rejecting common-mode voltage. The instrumentation-amplifier hierarchy includes differential amplifiers, analog signal-conditioning ICs, amplifiers, and semiconductor devices. Its three-op-amp architecture and current-feedback input stage make it suitable for sensors and measurement systems in which small differential signals are superimposed on a larger common-mode voltage. Key characteristics include 4 V/µs slew rate, low offset drift of 0.5 µV/5°C maximum, and input protection to +40 V. The wide supply range extends to +18 V, while the input architecture retains a bandwidth of 200 kHz at a gain of 100. These characteristics support precision bridge, current-shunt, and sensor-amplification circuits without requiring a high-power amplifier. The INA129PG4 uses a versatile three-op-amp architecture. A single external resistor establishes the gain, allowing the same device to serve multiple measurement ranges. Its current-feedback input circuitry is designed to preserve usable bandwidth at higher closed-loop gains. The combination of low supply current, low offset, high CMRR, and protected inputs makes it especially useful for compact, low-power measurement instruments. Typical applications include bridge-sensor signal conditioning, portable instrumentation, industrial process monitoring, medical measurement interfaces, and low-level differential-signal acquisition. Its protected inputs can simplify front-end design when the source may produce transient overvoltage, although the complete application must still satisfy the device's absolute maximum ratings. For a new PCB, use the manufacturer pin-description table to assign all eight DIP connections and place the gain resistor close to the gain-setting pin. Check supply voltage, common-mode input range, input impedance, and output swing at the intended gain before finalizing component values. This product page combines the manufacturer specifications, package details, replacement analysis, parameter comparisons, and practical design guidance to help engineers evaluate the INA129PG4 before committing a precision measurement circuit to production.

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INA129U - ±18V Precision Instrumentation Amp | Texas Instruments
INA129U

INA129U - ±18V Precision Instrumentation Amp | Texas Instruments

The Texas Instruments INA129U is a precision, low-power instrumentation amplifier with a 1.3 MHz gain-bandwidth product, 120 dB minimum common-mode rejection, and an 8-pin SOIC package. It accepts single or dual supplies up to ±18 V and uses one external resistor to set gain from 1 through 10,000. Designed around a versatile three-op-amp architecture, the INA129U supports accurate differential measurement while preserving wide common-mode range and robust input protection. An instrumentation amplifier is a specialized amplifier category that measures the voltage difference between two inputs while rejecting signals common to both nodes. INA129U belongs to the hierarchy instrumentation amplifier, differential amplifier, analog signal-conditioning IC, and power-management-independent semiconductor. Its three-op-amp topology provides high input impedance, precise differential gain, and improved common-mode rejection compared with a simple difference amplifier. Key verified features include maximum offset voltage of 50 µV, maximum offset drift of 0.5 µV/°C, maximum input bias current of 5 nA, and differential input protection extending to ±40 V. The current-feedback input circuitry maintains useful bandwidth at higher closed-loop gains, including 200 kHz at a gain of 100. These characteristics make the device useful where small transducer outputs must be amplified accurately in the presence of a larger common-mode voltage. The INA129 gain equation uses a 49.4 kΩ external resistor to support drop-in replacement with comparable instrumentation amplifiers. Gain accuracy depends on that resistor and associated layout parasitics, so designers should follow the manufacturer gain-setting guidance and preserve a symmetric input path. Low bias current is especially valuable for high-impedance sensor sources, while high CMR suppresses supply and ground disturbances that appear equally on both inputs. Typical uses include bridge-transducer signal conditioning, isolated low-voltage sensing, current-shunt measurement, biomedical acquisition, industrial sensor interfaces, laboratory instrumentation, and portable diagnostic equipment. For these applications, the ±40 V protected inputs can reduce accidental overload risk, although external protection and supply limits still require validation. The principal design consideration is keeping both input paths symmetric and placing the gain resistor close to the device. Incorrect Kelvin routing or unequal input impedance can degrade CMR and offset performance. The 8-pin SOIC also makes PCB assembly straightforward, while exposed thermal behavior and supply noise still require normal analog-layout practices. This page consolidates verified manufacturer and distributor information, package details, purchasing context, applications, and replacement guidance. It also distinguishes explicitly supported drop-in candidates from parts that require engineering review, helping designers compare the INA129U with alternatives rather than treating them as automatic equivalents.

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