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INA117AM - ±200V Difference Amplifier | Texas Instruments
INA117AM

INA117AM - ±200V Difference Amplifier | Texas Instruments

Texas Instruments INA117AM is a precision unity-gain difference amplifier with a common-mode input range up to ±200 V, a 200 kHz bandwidth, and an 8-pin TO-99 metal-can package. It is designed to extract small differential voltages from high-voltage or high-impedance signal chains without requiring an external precision resistor network. A difference amplifier is a specialized amplifier topology that amplifies the voltage between two inputs while rejecting a voltage common to both inputs. The INA117 belongs to the broader hierarchy of differential amplifiers, instrumentation signal conditioners, amplifier ICs, and analog semiconductor devices. Its integrated thin-film resistor network provides matched ratios, allowing accurate differential measurement when its common-mode and output operating limits are respected. The monolithic INA117 combines a precision operational amplifier with an integrated resistor network. Its unity-gain architecture makes it suitable for direct differential sensing, while the ±200 V common-mode capability separates the usable input signal from the potentially much larger voltage appearing at both inputs. The 200 kHz bandwidth supports measurements beyond static DC conditions but remains focused on precision signal extraction rather than high-speed data conversion. The INA117 family is also specified for operation from -40°C to 85°C. Two package options are available for the INA117 family: an 8-pin plastic mini-DIP and an 8-pin SO-8 surface-mount package. The INA117AM is the TO-99-8 metal-can ordering option shown by the manufacturer and distributor listings. The metal-can format supports compact through-hole insertion and is useful where a robust, shielded package is preferred over a surface-mount carrier. Its 8-pin configuration also means the differential amplifier requires careful signal routing and grounding around the circular package. Typical applications include high-voltage current sensing, power-converter feedback monitoring, battery-system measurement, industrial transducer interfaces, and instrumentation where a small differential signal is superimposed on a large common-mode voltage. In these systems, the INA117 can reject the common signal and present a scaled differential result to an ADC, comparator, control loop, or measurement instrument. Input protection, common-mode transient limits, output saturation, and thermal behavior must be evaluated together. When implementing this device, verify that neither input exceeds the specified common-mode range under every operating condition. Keep sensitive input and reference connections short, use a stable low-noise supply, and provide adequate return paths for high-impedance sources. Account for output settling and bandwidth when filtering small signals from fast common-mode transients, since common-mode rejection and transient performance are distinct design considerations. This product page combines the manufacturer’s device description, package information, operating-temperature range, exact ordering identifier, source documents, application guidance, and qualified replacement analysis. It also distinguishes genuine pin-compatible alternatives from devices that share only the broad function of high-voltage difference amplification, helping engineers make a PCB-level replacement decision rather than a feature-level comparison.

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INA117BM - Precision Difference Amplifier | Texas Instruments
INA117BM

INA117BM - Precision Difference Amplifier | Texas Instruments

The Texas Instruments INA117BM is a precision unity-gain difference amplifier with a very high common-mode input voltage range, integrated thin-film resistor network, and low nonlinearity of 0.001%. The device is specified for a 200 kHz bandwidth in the CSO: SHE implementation, with a 500 kHz option also described for the CSO: TID implementation. INA117BM is packaged in the 8-pin TO-99-8 metal package, making it suitable for instrumentation, buffer, and high-side current-sense applications where the signal can be close to the supply rails. The amplifier is designed to reject common-mode interference while preserving the differential signal, which helps improve measurement accuracy in systems exposed to large common-mode voltages. A difference amplifier is an analog signal-conditioning component that subtracts one input voltage from another and amplifies the resulting difference. The INA117 belongs to the instrumentation amplifier and differential amplifier family, where precision resistor matching helps maintain accurate gain and common-mode rejection. Its monolithic construction combines a precision operational amplifier with an integrated thin-film resistor network, simplifying circuit design compared with a discrete resistor network and separate op amp. The result is a fixed unity-gain device intended for applications requiring accurate differential measurement rather than adjustable gain. Key characteristics of the INA117BM include low nonlinearity of 0.001% and a 200 kHz bandwidth for the specified CSO: SHE die. The wide common-mode input range allows the input terminals to operate near the supply-voltage envelope, which is useful when measuring small differential signals riding on a larger voltage. The device is offered in an 8-pin plastic mini-DIP and an 8-pin SO-8 surface-mount package in the INA117 family; INA117BM specifically uses the TO-99-8 package. The specified operating temperature range for the family is -40°C to 85°C. Typical uses include high-side current sensing in motor-control and power-conversion systems, battery monitoring, precision bridge amplifiers, and industrial measurement front ends. The unity-gain architecture makes the part appropriate when the system requires a fixed differential gain of one and very high common-mode rejection. Applications should still verify the exact supply, common-mode, output-swing, and stability limits for the selected package and operating conditions before production release. For PCB implementation in a through-hole TO-99-8 design, preserve adequate clearance around the metal package, route sensitive input traces away from switching nodes, and use a stable reference or low-impedance return for the signal source. Because the internal gain network is precision matched, careful grounding and connector placement are important for preserving the benefit of the common-mode rejection. This page provides technical guidance, application fit, and pin-compatible replacement information for engineers evaluating the INA117BM.

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INA117KU - ±200V High CMV Difference Amplifier | TI
INA117KU

INA117KU - ±200V High CMV Difference Amplifier | TI

The Texas Instruments INA117KU is a precision unity-gain difference amplifier with a very high common-mode input voltage range of up to ±200V (VS = ±15V), housed in an 8-pin SOIC (SO-8) surface-mount package. It delivers a gain error of just 0.02% max and nonlinearity of 0.001% max. A difference amplifier is a special class of instrumentation amplifier that subtracts two input signals and rejects any voltage common to both inputs. Within the signal-chain hierarchy (difference amplifier -> instrumentation amplifier -> operational amplifier -> analog front end), the INA117 occupies a niche defined by extreme common-mode tolerance, allowing it to measure small differential signals riding on large DC or AC common-mode voltages. Key features include a ±200V common-mode input range, protected inputs rated to ±500V common-mode and ±500V differential, unity gain with 0.02% max gain error, 0.001% max nonlinearity, and a minimum CMRR of 86 dB. These numbers stem from an integrated thin-film resistor network that is precisely matched on-chip, eliminating external precision resistor matching. Architecturally, the monolithic IC combines a precision bipolar op amp with the laser-trimmed resistor network. Because the resistor ratios are trimmed on the same die, the INA117 achieves CMRR and accuracy unobtainable with discrete resistor-divided op amp circuits, and its CMRR holds up over temperature. Typical applications include current shunt measurements on high-side bus rails, industrial motor drive voltage sensing, level shifting of high-voltage signals down to ADC-compatible ranges, and test equipment input conditioning. Design-wise, note that the ±200V range requires VS of ±15V; lower supplies reduce the usable common-mode window. Reference pins should be driven from a low-impedance source to preserve CMRR. This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.

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INA117KU/2K5 - High Common-Mode Voltage Difference Amplifier | TI
INA117KU/2K5

INA117KU/2K5 - High Common-Mode Voltage Difference Amplifier | TI

The Texas Instruments INA117KU/2K5 is a precision unity-gain difference amplifier with a very high common-mode input voltage range of plus/minus 200V at VS = plus/minus 15V, delivered in an 8-pin SOIC (SO-8) surface-mount package rated from -40C to +85C. It integrates a precision monolithic op amp with a laser-trimmed thin-film resistor network, allowing accurate measurement of small differential voltages in the presence of very large common-mode signals without a discrete resistor divider front end. A difference amplifier (also called a differential amplifier or difference-amplifier IC) is a specialized analog signal-conditioning device that amplifies the voltage difference between two inputs while rejecting voltages common to both. Within the amplifier hierarchy, it sits under operational amplifiers and instrumentation amplifiers, which in turn belong to the broader class of linear amplifier ICs used in analog front ends and power management chains. Key features include common-mode input protection to plus/minus 500V (both common-mode and differential), a maximum gain error of 0.02% in unity gain, maximum nonlinearity of 0.001%, and a minimum CMRR of 86dB. The KU (SO-8) version provides a 200kHz bandwidth, per the specification note in the TI INA117 datasheet covering the CSO SHE versus TID process options. Technically, the INA117 uses an integrated precision resistor network around an internal op amp so the external circuit sees a true unity-gain subtractor. Laser trimming of the thin-film resistors sets the CMRR and gain accuracy without external calibration, and the wide protected input structure withstands faults up to plus/minus 500V. Typical applications include DC bus and motor-drive voltage sensing, battery pack monitoring, industrial process-control transducer interfaces, and data-acquisition systems that must reject high ground potential differences. The /2K5 suffix denotes the 2,500-piece tape-and-reel packing option. A key design consideration: the input pins must be series-limited per the datasheet fault-protection guidance so the plus/minus 500V protection rating holds under sustained overvoltage. This page synthesizes distributor pricing, drop-in alternative data, and practical design notes not found in the manufacturer datasheet alone.

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INA117P - ±200V High Common-Mode Difference Amplifier | TI
INA117P

INA117P - ±200V High Common-Mode Difference Amplifier | TI

The Texas Instruments INA117P is a precision unity-gain difference amplifier with a very high common-mode input voltage range of up to ±200V, housed in an 8-pin plastic DIP (PDIP-8) package. It delivers 0.001% maximum nonlinearity, a 200kHz bandwidth, and operation over the -40°C to +85°C industrial temperature range. A difference amplifier is a specialized analog signal-processing IC that measures the voltage difference between two nodes while rejecting any voltage common to both. Within the signal-chain hierarchy, it sits between a general-purpose operational amplifier and a full instrumentation amplifier: it provides a fixed, laser-trimmed gain and superior common-mode rejection, but no adjustable gain. Difference amplifiers are essential wherever a small sensor signal rides on a large common-mode offset, such as current shunt monitoring on high-voltage buses or motor-drive phase sensing. The INA117P integrates a precision op amp with a matched thin-film resistor network on a single monolithic die. This integration is the key differentiator: resistor matching and thermal tracking on-chip yield a common-mode rejection and gain accuracy that discrete resistor-op-amp solutions cannot achieve over temperature. The ±200V common-mode range far exceeds what a conventional op amp front end can tolerate, allowing direct connection across high-voltage rails without a divider or isolator. Typical applications include high-side and low-side current sensing in industrial drives, DC bus voltage monitoring in motor controllers and inverters, battery-management voltage taps, and data-acquisition front ends that must reject large ground offsets. In design, note that the device requires dual supplies (typically ±15V) and that the ±200V common-mode limit applies while powered; beyond the limit, protection must be external. Output is a ground-referenced signal equal to the input differential. This page synthesizes distributor pricing context, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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INA117P-BI - ±200V Common-Mode Differential Amplifier | TI
INA117P-BI

INA117P-BI - ±200V Common-Mode Differential Amplifier | TI

The Texas Instruments INA117P-BI is a precision unity-gain difference amplifier with a very high common-mode input voltage range of ±200V, designed to measure small differential voltages in the presence of large common-mode signals. The device uses a precision operational amplifier with an integrated thin-film resistor network, providing a compact solution for high-voltage instrumentation, current sensing, and industrial measurement systems. It is packaged in an 8-pin plastic mini-DIP package. A difference amplifier is a voltage-feedback amplifier that amplifies the voltage difference between two input terminals while rejecting voltage common to both inputs. The INA117P-BI is intended for applications where the signal of interest is small but the surrounding common-mode voltage can be large. Its ±200V common-mode input range is particularly useful when measuring small voltages across high-voltage bus systems, power-conversion circuits, and industrial equipment. Key performance specifications include a maximum unity-gain error of 0.02%, a maximum nonlinearity of 0.001%, a minimum CMRR of 86dB, and protected inputs rated at ±500V common-mode and ±500V differential. The device operates from a single supply or dual supply arrangement described by the manufacturer datasheet, and its specified operating temperature range is -40°C to +85°C. The INA117 family is also available in an 8-pin SO-8 surface-mount package for compact designs. The INA117P-BI is suitable for precision measurement, power-supply monitoring, current-shunt instrumentation, and analog signal-conditioning systems. Its integrated thin-film network improves gain matching and common-mode rejection without requiring external matched resistors. Designers should still provide input protection appropriate to the application, maintain the specified supply limits, and account for input bias-current effects and thermal conditions at the measurement nodes. For PCB implementation, place the amplifier close to the sensing components and route high-voltage and sensitive-signal paths to minimize leakage, contamination, and coupling. Use guarded grounding and clean analog return paths when measuring microvolt-level signals. The 8-pin PDIP format supports through-hole prototyping and repair, while the SO-8 alternative is preferable where board area is constrained. This page combines the manufacturer specifications, package details, sourcing information, and design guidance needed to evaluate the INA117P-BI for high-common-mode measurement systems.

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INA117PG4 - 200kHz High-CMV Difference Amp | Texas Instruments
INA117PG4

INA117PG4 - 200kHz High-CMV Difference Amp | Texas Instruments

Texas Instruments INA117PG4 is a single-amplifier precision difference amplifier with a 200 kHz bandwidth, 2.6 V/us slew rate, and a very high common-mode input voltage range. It accepts dual supplies of ±5 V to ±18 V and is packaged in an 8-pin through-hole plastic DIP. The device is intended for measuring small differential voltages in the presence of larger common-mode signals. A difference amplifier is a specialized operational-amplifier circuit that subtracts two input voltages and rejects their common component. This product type belongs to the hierarchy of difference amplifier, instrumentation amplifier, operational amplifier, and analog signal-conditioning IC. It is useful when a sensor or measurement node produces a small differential signal over a larger voltage reference or operating range. Key characteristics include an input offset voltage of 1 mV, 70 dB instrumentation-amplifier performance, 200 kHz bandwidth, and a 2.6 V/us slew rate. Its ±5 V to ±18 V supply range supports positive, negative, and split-supply operation. The single-amplifier configuration integrates the precision operational amplifier and resistive network needed for unity-gain differential measurement. The INA117PG4 uses a monolithic integrated circuit containing a precision op amp and thin-film resistor network. Its architecture supports accurate measurement of small differential voltages while suppressing common-mode voltage. The listed 20 mA per channel and 70 dB performance describe the device as an instrumentation-oriented difference amplifier rather than a general-purpose unity-gain buffer. Typical uses include high-side current measurement, bridge-sensor signal conditioning, battery monitoring, instrumentation inputs, and precision differential-to-single-ended conversion. Its broad common-mode range is especially useful when the measured difference is small relative to the voltage common to both input terminals. The 200 kHz bandwidth also makes it suitable for applications that need more signal bandwidth than a slow precision-only amplifier. Design the circuit so the common-mode voltage and differential input remain within the device's operating limits. Use a stable, low-noise reference when a nonzero differential threshold is required, and provide adequate bypassing around the supply pins. Because it is an 8-pin through-hole package, the INA117PG4 is convenient for prototyping, educational instruments, and industrial control boards with conventional DIP mounting. This product record combines the manufacturer's device classification with package, electrical, environmental, and application details, while adding comparison guidance and engineering design notes for faster component selection.

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INA117SM - High Common-Mode Difference Amplifier | TI
INA117SM

INA117SM - High Common-Mode Difference Amplifier | TI

The Texas Instruments INA117SM is a precision unity-gain difference amplifier in an 8-pin TO-99-8 package. It is designed to measure small differential voltages in the presence of large common-mode voltages. The device combines a precision operational amplifier with an integrated thin-film resistor network, providing 0.001% low nonlinearity and a bandwidth of 200 kHz when manufactured in the CSO: SHE process. A difference amplifier is a specialized amplifier configuration that rejects voltage common to both inputs and amplifies the voltage difference between them. The INA117 belongs to the high-common-mode difference-amplifier category, where its common-mode rejection capability is more important than its ability to operate only within a conventional low-voltage signal range. It is used as a signal-conditioning stage between high-voltage sensing nodes and downstream measurement or control circuitry. The principal benefits of the INA117SM are its very high common-mode input range, low nonlinearity of 0.001%, and 200 kHz bandwidth in the CSO: SHE version. Its unity-gain architecture simplifies closed-loop implementation while the integrated resistor network reduces external component count. The TO-99-8 package also provides a traditional through-hole format for instrumentation and industrial equipment where long-term availability and straightforward assembly are important. Internally, the INA117SM consists of a monolithic precision amplifier and thin-film resistor network. The difference-amplifier topology subtracts the two input voltages and multiplies the resulting differential signal by the closed-loop gain. At unity gain, the input pair is configured so that common-mode voltage is rejected while the desired sensor differential is amplified. Its specified bandwidth supports measurement systems that need more signal bandwidth than a slow precision-only amplifier, although filtering may still be required for high-noise environments. Typical applications include high-voltage current sensing, bridge-sensor signal conditioning, battery and power-system monitoring, industrial process measurement, and laboratory instrumentation. The device is particularly useful when a low-level differential signal is superimposed on a much larger common-mode voltage. System designers should also consider input protection, supply requirements, resistor tolerance, and the bandwidth required for the sensed waveform when assigning the amplifier. The main design consideration is that the INA117SM does not eliminate the need for careful analog layout. Keep input and feedback traces short, place compensation or filtering components close to the device, and avoid routing high-current paths near the sensitive input nodes. Confirm the common-mode and supply limits against the exact datasheet ordering information before applying the part where the input voltage can approach a system rail. This page consolidates the verified INA117SM product information, source links, technical distinctions, and selection guidance into one engineering reference. It also identifies same-package family options and explains where application-specific verification remains necessary, helping designers choose a replacement without assuming that different INA117 order codes are automatically interchangeable.

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INA118P - Precision Low-Power Instrumentation Amplifier | Texas Instruments
INA118P

INA118P - Precision Low-Power Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA118P is a precision, low-power instrumentation amplifier with one amplifier circuit, a maximum offset voltage of 50 µV, offset drift of 0.5 µV/°C, common-mode rejection of 110 dB at a gain of 1000, and operation from ±2.25 V supplies. It is packaged in an 8-pin plastic DIP and consumes only 350 µA quiescent current. Designed for precision signal conditioning, the INA118P uses a three-op-amp architecture and a single external gain-setting resistor to provide gains from 1 to 10000. Its current-feedback input circuitry supports wide bandwidth, including 70 kHz at a gain of 100. An instrumentation amplifier is a specialized analog amplifier optimized for measuring small differential signals while rejecting large common-mode voltages. The INA118 belongs to the broader hierarchy of instrumentation amplifier, precision amplifier, analog signal-conditioning IC, and power-management-independent semiconductor. Its internal feedback network provides accurate gain-setting while preserving high input impedance and low offset behavior. This makes it useful in sensor interfaces, current measurement, bridge transducers, biomedical instrumentation, and precision control systems. The principal accuracy features are the laser-trimmed low offset voltage of 50 µV maximum and drift of 0.5 µV/°C maximum. Input bias current is specified at 5 nA maximum, while input protection extends to ±40 V. The wide supply range reaches ±18 V, and the low 350 µA quiescent current supports battery-operated systems. The device is available in an 8-pin plastic DIP for through-hole PCB assembly, with an operating temperature range of -40°C to +85°C as stated in the supplied technical data. The three-op-amp architecture and current-feedback input stage provide useful bandwidth at higher closed-loop gains. A single external resistor sets the gain from 1 to 10000, allowing the same device to serve low-gain signal conditioning and high-gain bridge or sensor measurements. The 70 kHz bandwidth at gain 100 helps balance measurement speed against noise and accuracy, while the 110 dB common-mode rejection at gain 1000 supports measurement of weak differential signals embedded in larger common-mode environments. Typical uses include bridge-sensor amplification, strain-gauge and load-cell measurement, low-current sensing, battery-powered instrumentation, industrial process measurement, medical signal acquisition, and precision analog-to-digital converter front ends. In a bridge circuit, the instrumentation amplifier rejects supply or ground shifts shared by the sensor outputs and amplifies the small differential voltage produced by the sensor. In a current-shunt system, its low bias current helps minimize measurement error, while input protection is useful in applications where transients may reach the input terminals. The primary design consideration is selecting the external gain resistor and confirming that the resulting bandwidth, input common-mode range, output swing, supply voltage, and settling time meet the measurement requirements. Place the gain resistor close to the gain-setting pin and maintain a low-noise layout around the sensitive input pins. Verify output headroom at the intended load because instrumentation-amplifier accuracy specifications are meaningful only when the circuit operates within its input and output linear ranges. This page combines the verified manufacturer and distributor information for INA118P with package details, application guidance, comparison fields, and design notes intended to make selection and implementation more practical than a basic distributor listing.

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INA118PB - Precision Instrumentation Amplifier | Texas Instruments
INA118PB

INA118PB - Precision Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA118PB is a precision, low-power instrumentation amplifier with 50 uV maximum offset voltage, 0.5 uV/°C maximum offset drift, 5 nA maximum input bias current, and 110 dB minimum common-mode rejection, housed in an 8-pin plastic DIP package. It operates from a low 1.35 V to 18 V supply range, supports dual supplies down to ±2.25 V, and consumes only 350 uA of quiescent current. An instrumentation amplifier is a specialized analog amplifier designed to accurately amplify small differential signals while rejecting large common-mode voltages. Its internal three-op-amp architecture and current-feedback input stage provide high input impedance, stable gain, and useful bandwidth at high closed-loop gains. The INA118 belongs to the broader hierarchy of differential amplifier, instrumentation amplifier, analog amplifier, and semiconductor. The INA118PB is laser trimmed for low offset voltage and low temperature drift, while its internal input protection supports inputs to ±40 V. A single external gain-setting resistor provides gains from 1 to 10,000. According to the Texas Instruments product page, bandwidth remains 70 kHz at a gain of 100, while the low 350 uA quiescent current makes the device suitable for battery-operated and portable measurement systems. The three-op-amp internal design simplifies instrumentation-amplifier implementation while maintaining precision over the specified temperature range of -40°C to +85°C. Differential inputs minimize sensitivity to common-mode noise, and the low-offset architecture improves accuracy in bridge, shunt, and sensor-interface circuits. Its low-power operation is particularly valuable when every milliamp of supply current affects battery life or thermal design. Typical uses include bridge-amplifier interfaces, current-shunt measurements, precision sensor conditioning, biomedical instrumentation, industrial process monitoring, and low-noise battery-powered acquisition systems. The protected inputs can improve resilience to accidental signal-chain overvoltage, although the design must still maintain valid supply and common-mode conditions for accurate operation. Designers should place the gain resistor close to the RG pins, route differential inputs symmetrically, and provide local supply bypassing. Input filtering must account for the protected input network and noise requirements, while PCB cleanliness is important because high-gain measurements amplify small residual errors. The 8-pin plastic DIP format is suitable for through-hole prototypes, legacy systems, and automated test fixtures. This page combines verified Texas Instruments specifications, distributor availability, same-package drop-in alternatives, and practical engineering guidance. It adds design-focused context for gain selection, bandwidth, input protection, supply bypassing, and PCB implementation that is not directly visible in a distributor listing.

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INA118U - Precision Low-Power Instrumentation Amplifier | Texas Instruments
INA118U

INA118U - Precision Low-Power Instrumentation Amplifier | Texas Instruments

The Texas Instruments INA118U is a precision, low-power instrumentation amplifier with a nominal gain of 100, an 800 kHz bandwidth, and operation from dual supplies as low as ±2.25 V. It is packaged in an 8-pin SOIC (SO-8) surface-mount package and is intended for accurate differential-signal measurement where low offset, high common-mode rejection, low power consumption, and a simple external gain resistor are important. An instrumentation amplifier is a specialized amplifier category used to amplify a small differential voltage while rejecting a larger common-mode voltage. INA118 belongs to the precision operational-amplifier hierarchy, combining low-noise input stages, laser trimming, and stable gain-setting resistors in one integrated circuit. This makes it suitable for sensor interfaces, current measurement, portable instrumentation, and industrial acquisition systems where the source signal may be small relative to the surrounding voltage environment. The INA118U is laser-trimmed for low offset voltage of 50 μV and offset drift of 0.5 μV/°C. According to the manufacturer datasheet, common-mode rejection reaches 110 dB at a gain of 1000. The device consumes only 350 μA of quiescent current, allowing operation from low-voltage supplies and supporting battery-powered measurement systems. Its 800 kHz bandwidth provides useful response for many industrial and sensor signals without requiring a high-speed instrumentation amplifier. The INA118 uses an external gain-setting resistor, so the gain can be selected for the measurement system while the internal feedback network maintains consistent behavior. The 8-pin SOIC package simplifies assembly on conventional surface-mount PCB designs. Compared with discrete op-amp networks, the integrated instrumentation amplifier reduces component count and simplifies common-mode rejection and gain stability, while still requiring attention to input filtering, reference grounding, output range, and supply bypass capacitors. Typical applications include low-side current sensing, bridge and pressure-sensor excitation, battery monitoring, biomedical instrumentation, portable test equipment, and industrial process measurement. In these systems, the INA118U converts a small differential sensor voltage into a single-ended output while suppressing common-mode interference. The low quiescent current is especially beneficial when the measurement electronics operate continuously from limited power budgets. Designers should verify the input common-mode range and output swing against the actual supply voltages, because the usable measurement range is not limited only by the amplifier’s gain and bandwidth. Input filtering should be placed close to the pins, with care taken to preserve differential-mode behavior. A low-noise reference and properly placed supply bypass capacitors are also important when measuring small signals. This page combines verified manufacturer specifications, distributor availability information, practical application guidance, and drop-in replacement analysis to support component selection and board-level implementation.

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INA118U/2K5 - Precision Low Power Instrumentation Amp | TI
INA118U/2K5

INA118U/2K5 - Precision Low Power Instrumentation Amp | TI

The Texas Instruments INA118U/2K5 is a precision, low-power instrumentation amplifier delivering a maximum input offset voltage of 50 uV, minimum common-mode rejection of 110 dB, and 350 uA quiescent current, housed in an 8-pin SOIC (D) surface-mount package supplied in tape-and-reel (2K5 = 2500-piece reel). An instrumentation amplifier is a specialized differential amplifier designed to amplify the difference between two input signals while rejecting common-mode noise. Within the signal-chain hierarchy (amplifier -> precision amplifier -> instrumentation amplifier -> analog front end), the classic three-op-amp topology used in the INA118 provides a high-impedance, balanced differential input and a single-ended output referenced to an external reference pin, which is essential for accurate measurement of small sensor signals in noisy industrial environments. Key features include a gain set by a single external resistor from 1 V/V to 10000 V/V, current-feedback input circuitry that preserves 70 kHz of bandwidth even at a gain of 100 V/V (0.8 MHz at G = 1), input protection to plus or minus 40 V, and maximum offset drift of only 0.5 uV/degC. The wide supply range, up to plus or minus 18 V dual supply or a single supply down to 2.7 V total, allows use in both industrial 24 V systems and low-voltage portable designs. The bipolar, current-feedback input architecture maintains wide bandwidth at high gains, a key advantage over conventional three-op-amp topologies whose bandwidth collapses at high gain. The gain equation G = 1 + 50 kohm/RG uses a single precision resistor, keeping the bill of materials minimal while internal input protection clamps tolerate fault voltages up to 40 V beyond the rails. Typical applications include thermocouple and RTD temperature measurement front ends, bridge transducer (load cell and strain gauge) signal conditioning, medical ECG/EEG biopotential acquisition, and industrial process-control analog interfaces where 110 dB CMR rejects ground noise and mains interference. Design consideration: keep the gain-setting resistor RG close to pins 1 and 8, and drive the REF pin (pin 5) from a low-impedance source, since REF-pin impedance directly degrades common-mode rejection. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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INA118UB - Precision Instrumentation Amp, 800kHz SOIC-8 | TI
INA118UB

INA118UB - Precision Instrumentation Amp, 800kHz SOIC-8 | TI

The Texas Instruments INA118UB is a precision, low-power instrumentation amplifier delivering 800 kHz bandwidth (G = 1), 50 uV maximum input offset voltage, and 0.09 V/us slew rate in an 8-pin SOIC package operating from 1.35 V to 18 V per supply rail. An instrumentation amplifier is a specialized difference amplifier designed to extract small differential signals riding on large common-mode voltages. Within the signal-chain hierarchy, it sits between the sensor and the ADC, providing high input impedance, precisely gain-set amplification, and superior common-mode rejection compared to a general-purpose op amp built from discrete resistors. Key features of the INA118UB include a single external resistor that sets gain from 1 V/V to 10000 V/V, low power consumption suited to portable and battery-powered equipment, and a 3-op-amp topology that guarantees matched, temperature-stable gain. The B-grade suffix denotes enhanced offset accuracy relative to the base INA118U grade. The classic three-op-amp architecture uses a precision input stage with two buffered amplifiers feeding a difference amplifier, so gain accuracy and CMRR do not depend on external resistor matching. The REF pin allows output offset shifting for single-supply designs. Typical applications include weigh-scale and bridge transducer signal conditioning, thermocouple and RTD front ends, medical ECG/EEG biopotential amplifiers, and industrial data acquisition channels where microvolt-level signals must be amplified before digitization. Design consideration: keep the RG resistor connection short and use a low-drift resistor, since gain error and drift are dominated by this external component rather than the IC itself. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.

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INA118UB/2K5 - Precision Low Power Instrumentation Amp | TI
INA118UB/2K5

INA118UB/2K5 - Precision Low Power Instrumentation Amp | TI

The Texas Instruments INA118UB/2K5 is a precision, low-power instrumentation amplifier with a maximum input offset voltage of 50 uV, high common-mode rejection of 110 dB (minimum), and low input bias current of 5 nA maximum, housed in an 8-pin SOIC (D) package supplied in tape-and-reel of 2500 units. An instrumentation amplifier is a specialized differential amplifier designed to amplify the difference between two input signals while rejecting common-mode noise. Within the signal-chain hierarchy, it sits above general-purpose operational amplifiers: an in-amp -> differential amplifier -> amplifier -> analog front end. Its three-op-amp architecture provides a high-impedance, internally balanced input stage, making it indispensable wherever small sensor signals ride on large common-mode voltages. Key features of the INA118 include a gain range of 1 V/V to 10000 V/V set by a single external resistor, input protection to plus or minus 40 V, and a wide supply range from +-1.35 V up to +-18 V. Its current-feedback input circuitry preserves bandwidth at high gain, delivering 70 kHz of bandwidth even at a gain of 100, which distinguishes it from classic three-op-amp designs whose bandwidth collapses at high gains. Technically, the INA118 uses a current-feedback input topology with internal input protection diodes. The low offset drift of 0.5 uV per degree Celsius (maximum) ensures accuracy over the industrial temperature range, while the 350 uA quiescent current suits battery-powered and loop-powered instruments. The gain equation is G = 1 + (50 kOhm / RG), where RG is the gain-setting resistor between pins 1 and 8. Typical applications include bridge amplifiers for load cells and strain gauges, thermocouple and RTD signal conditioning, medical instrumentation front ends, and industrial process-control transmitters. The SOIC-8 footprint and wide supply range make it a drop-in fit for legacy sensor boards. When designing, choose 1 percent or better low-drift resistors for the gain network since gain error dominates total accuracy at high gains, and keep the REF pin driven from a low-impedance source to preserve CMR. This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing is as of 2026-09-13.

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INA121P - FET-Input Low Power Instrumentation Amplifier DIP-8 | Texas Instruments
INA121P

INA121P - FET-Input Low Power Instrumentation Amplifier DIP-8 | Texas Instruments

The Texas Instruments INA121P is a FET-input, low-power instrumentation amplifier (INA) offering excellent accuracy in an 8-pin PDIP package. It delivers ±4 pA typical bias current, ±450 µA quiescent current, ±200 µV input offset voltage, and ±2 µV/°C offset drift, with 106 dB common-mode rejection and a wide ±2.25V to ±18V supply range. What is an instrumentation amplifier? An instrumentation amplifier is a precision differential amplifier with very high input impedance, high common-mode rejection ratio (CMRR), and user-adjustable gain set by a single external resistor. INAs occupy the hierarchy: instrumentation amplifier -> differential amplifier -> operational amplifier -> analog IC. Compared with a discrete op-amp difference amp, a monolithic INA matches the input stage transistors on the same die, providing inherently high CMRR without precision resistor networks, making it the standard building block for low-level sensor signal conditioning. The INA121P's versatile three-op-amp topology and small footprint suit general-purpose precision applications. Internal input protection survives ±40V differential or common-mode faults, and gain is set from 1 V/V to 10,000 V/V using one external resistor between pins 1 and 8. Noise is specified at 20 nV/√Hz (f = 1 kHz) with 0.001% nonlinearity, and the bandwidth reaches 600 kHz (G = 100). The 8-pin PDIP through-hole package supports easy breadboarding and hand-repairable designs where surface-mount parts would be impractical. Architecture-wise, the INA121P uses CMOS FET input stages for sub-picoampere bias current and laser-trimmed thin-film resistors for gain accuracy. The three-op-amp topology delivers fully differential inputs and a single-ended output referenced to pin 5 (REF). Operation from a single supply down to ±2.25V accommodates battery-powered systems, while ±18V supplies support industrial 4-20 mA and ±15V signal chains. Typical applications include ECG/biomedical front-ends, weigh scales and load-cell bridges, thermocouple and RTD signal conditioning, industrial process-control transducer amplifiers, and audio-frontend microphone preamps requiring high CMRR. The ±4 pA input bias permits direct interface to photodiodes and high-impedance pH/ion-selective electrodes without input-bias compensation networks. Designers should guard-drive pin 1 and pin 8 (RG) with a buffered reference rather than leaving them floating when gain is set at minimum (1 V/V), and provide 0.1 µF supply bypass capacitors within 5 mm of pins 4 and 7. The 8-pin PDIP's higher thermal resistance (~80 °C/W) limits continuous dissipation above 400 mW, so PCB copper area should be assessed for productionized layouts. This page synthesizes distributor pricing, drop-in DIP-8 alternatives, and practical design notes not found in the manufacturer datasheet alone.

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INA121PA - Low-Power FET-Input Instrumentation Amplifier | TI
INA121PA

INA121PA - Low-Power FET-Input Instrumentation Amplifier | TI

The Texas Instruments INA121PA is a single-circuit, FET-input, low-power instrumentation amplifier with ±4 pA input bias current, ±200 µV input offset voltage, and a 106 dB common-mode rejection ratio, packaged in an 8-pin plastic DIP. Its wide supply range of ±18 V, adjustable gain from 1 to 10,000 V/V, and 600 kHz bandwidth make it suitable for precision signal conditioning involving high-impedance sources. The three-op-amp architecture supports general-purpose instrumentation applications while maintaining low nonlinearity error of 0.001%. An instrumentation amplifier is a specialized analog amplifier optimized for measuring small differential signals superimposed on larger common-mode voltages. Its internal three-op-amp topology provides high input impedance, differential gain, and common-mode rejection without requiring matched external resistors. The INA121PA adds a FET-input stage whose ±4 pA bias current is particularly useful with sensors, transducers, and laboratory sources whose output impedance is high. Low power consumption is a central advantage of the INA121 family. Its typical quiescent current is ±450 µA, helping reduce supply demand in battery-operated and portable measurement systems. Input offset voltage is specified at ±200 µV, while input offset drift is ±2 µV/°C. The 106 dB CMR figure suppresses common-mode interference, and the wide ±18 V supply range permits operation with both positive and negative supply rails when the measurement circuit requires bipolar input or output signals. The device combines a low-noise input stage with a gain range of 1 to 10,000 V/V. The 600 kHz bandwidth supports measurement signals extending from slow process-control quantities through higher-bandwidth sensor and communications signals. A low nonlinearity error of 0.001% is important when preserving amplitude accuracy through a substantial gain range. The internal three-op-amp design also simplifies implementation by integrating the gain-setting resistor network. Typical uses include bridge-transducer amplification, precision current measurement, laboratory instrumentation, biomedical signal acquisition, industrial sensor interfaces, and low-level differential sensing. The very low bias current makes the amplifier appropriate for photodiode, electrochemical-cell, and other high-output-impedance sources. The negative and positive supply capability is valuable for bipolar sensor outputs and offset signals around ground. When designing around the INA121PA, verify input and output common-mode limits under the intended supply combination, including unbalanced ±18 V operation. Place the gain-setting resistor directly across the designated pins, maintain short input paths to minimize leakage and noise pickup, and use appropriate supply bypassing near the device. Check the complete operating region because gain, supply voltage, output swing, and input common-mode range are interdependent. This product overview combines the manufacturer’s core electrical characteristics with practical design guidance, package details, and a drop-in replacement assessment. It also identifies the limits of equivalent parts so engineers can preserve the INA121PA’s ±4 pA bias current, 106 dB CMR, low-power operation, and 8-pin plastic-DIP footprint when qualifying alternatives.

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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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