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INA114AU

INA114AU - 1MHz Precision INA Amplifier | Texas Instruments

Texas Instruments INA114AU is a precision, single-amplifier instrumentation amplifier with 1 MHz gain-bandwidth product, 50 µV maximum offset voltage, 11 nV/√Hz input noise, and 3 mA power consumption, housed in a 16-pin SOIC package. It supports dual supplies of ±2.25 V to ±18 V, provides internal input protection to ±40 V, and accepts a single gain-setting resistor for gains from 1 to 10,000. An instrumentation amplifier is a specialized amplifier that measures small differential signals while rejecting large common-mode voltages. The INA114 belongs to the precision instrumentation-amplifier hierarchy, where instrumentation amplifier, differential amplifier, analog signal-conditioning IC, and power-management-adjacent signal-chain component describe its principal function. Its three-op-amp architecture provides high input impedance and accurate differential gain, making it useful when the source resistance can vary or when a conventional op-amp differential circuit would suffer input-bias-current errors. Key features include 50 µV maximum offset voltage, 0.25 µV/°C maximum offset drift, 2 nA maximum input bias current, and 115 dB minimum common-mode rejection. A single external resistor selects gains from 1 to 10,000, while the 1 MHz gain-bandwidth product supports a 0.06 V/µs slew rate. These characteristics favor precision measurement rather than high-speed video amplification, although the 1 MHz bandwidth is sufficient for many industrial, medical, and instrumentation signals. The INA114 uses a three-op-amp internal architecture to establish differential gain while maintaining high input impedance. Laser trimming reduces offset errors, and the internal input protection network allows each input to withstand ±40 V without damage. With a typical 3 mA quiescent-current specification and operation down to ±2.25 V, the device supports dual-supply precision systems and single 5 V applications using suitable output-reference arrangements. Typical uses include bridge and strain-gauge conditioning, current-shunt measurement, laboratory instrumentation, ECG and physiological-signal acquisition, and industrial sensor interfaces. In a bridge circuit, the low offset and high common-mode rejection improve stability in the presence of long cables or supply variation. For sensor excitation, the amplifier converts a small millivolt-level differential output into a voltage suitable for an ADC. Designers must select the gain resistor carefully because its tolerance, temperature coefficient, and parasitic capacitance affect gain accuracy and bandwidth. Decoupling capacitors should be placed close to the supply pins, and the reference pin should be configured to provide the required output offset. Input filtering must preserve the required settling time because the internal protection resistors can combine with source capacitance to alter bandwidth. This product record consolidates verified manufacturer specifications, distributor information, drop-in alternatives, package details, and application guidance. It highlights the engineering trade-offs among gain, bandwidth, input protection, common-mode rejection, and supply requirements that are not apparent from the MPN alone.

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INA114BP

INA114BP - 1MHz Precision Instrumentation Amplifier | TI

Texas Instruments INA114BP is a precision three-op-amp instrumentation amplifier with a 1 MHz gain-bandwidth product, 50 uV maximum offset voltage, and an 8-pin PDIP package. It supports gains from 1 to 10,000 through one external gain-setting resistor, while input protection tolerates voltages up to +/-40 V. Its low-noise and high-accuracy characteristics make it suitable for measuring small differential signals in industrial, medical, and test systems. An instrumentation amplifier is a specialized amplifier category designed to extract a small differential voltage while rejecting common-mode interference. Its internal three-op-amp architecture provides high input impedance and precise gain control, making it more effective than ordinary operational amplifiers in many sensor-front-end applications. Within the signal-chain hierarchy, it belongs to the broader family of amplifier ICs and analog signal-conditioning components. Key features include 11 nV/sqrt(Hz) input noise, 115 dB minimum common-mode rejection, 2 nA maximum input bias current, and 0.25 uV/degree C maximum input offset drift. The low offset voltage and drift reduce measurement errors in bridge, strain-gauge, and low-level current sensing systems. Internal input protection supports +/-40 V, helping the device tolerate transient overloads encountered outside the normal operating input range. The INA114 uses a versatile three-op-amp signal chain and accepts single or dual supply operation. Its gain is established with one external resistor, allowing a single circuit implementation to cover gain settings from 1 to 10,000. The 1 MHz bandwidth supports dynamic sensor signals while remaining appropriate for precision industrial instrumentation rather than very high-frequency signal extraction. Typical uses include 4-20 mA current-loop receivers, strain-gauge bridge amplifiers, isolated-signal front ends, precision current-shunt measurements, biomedical instrumentation, and laboratory measurement equipment. The device is particularly useful when the wanted differential signal is small relative to ground offsets or common-mode noise present at the input connectors. When designing the input stage, use an external gain resistor with suitable stability and thermal characteristics, keep input traces short, and connect the reference pin to a clean analog ground when unity gain is required. Check input common-mode range and output swing at every supply voltage before selecting the final gain, because bandwidth and output capability change with operating conditions. This page combines the device's precision specifications, application guidance, package information, replacement analysis, and practical design considerations to support faster component evaluation and more reliable front-end design.

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INA114BU

INA114BU - 1MHz Precision Instrumentation Amplifier | TI

Texas Instruments INA114BU is a precision three-op-amp instrumentation amplifier with 1 MHz gain-bandwidth performance, 50 uV input-offset voltage, 11 nV/√Hz input noise, and approximately 3 mA power consumption. The device is offered in a 16-pin SOIC surface-mount package for precision measurement systems requiring differential input amplification and single-resistor gain programming. An instrumentation amplifier is a specialized analog amplifier optimized for measuring small differential signals superimposed on large common-mode voltages. It belongs to the amplifier hierarchy as an instrumentation amplifier, differential amplifier, and analog signal-conditioning IC. Its internal three-op-amp architecture improves common-mode rejection and enables gains from 1 to 10,000 by selecting one external gain-setting resistor. This makes the INA114BU useful when a sensor, transducer, or measurement bridge produces a low-level differential output that must be amplified without amplifying system noise or supply variation equally. The most prominent INA114BU characteristics are its 1 MHz bandwidth, 50 uV offset voltage, and 11 nV/√Hz noise density. The single external gain resistor simplifies adjustment while preserving a broad usable gain range. Input protection can withstand voltages to ±40 V, helping the amplifier tolerate moderate overvoltage conditions. A 2.25 V to 18 V supply range supports both low-voltage and conventional industrial analog systems, while the approximately 3 mA supply-current figure supports low-power instrumentation. The INA114BU uses a versatile three-op-amp instrumentation-amplifier architecture. Its gain is established by the external resistor connected to the gain-setting node, avoiding the need for matched resistor networks. Input and feedback resistors are integrated internally, while the specified input-noise and offset characteristics support accurate extraction of small differential signals. The 1 MHz bandwidth allows the amplifier to process signals beyond static or very-low-frequency measurement tasks while retaining a compact analog implementation. Typical uses include bridge-based pressure and load sensing, biomedical instrumentation, current-shunt measurement, laboratory test equipment, and industrial process-control front ends. The 16-pin SOIC package is useful where moderate pin count, surface-mount assembly, and access to a conventional package are preferred. Its ±40 V input-protection capability is especially relevant when a sensor line can experience transient or sustained voltage excursions. Circuit design should begin with the required gain and bandwidth. Because gain is set by one resistor, verify its noise contribution, tolerance, and stability alongside the sensor source impedance. Keep input and feedback routing short, use a clean low-noise ground reference, and place supply-bypass capacitance close to the device. Check the ±40 V protection rating against the actual maximum input voltage rather than treating it as a substitute for normal operation within the supply range. This product page combines the Texas Instruments INA114 specifications with package information, practical application guidance, drop-in comparison candidates, and design considerations. The comparisons focus on same-package precision instrumentation amplifiers, while the application guidance focuses on practical gain selection, input protection, noise, and layout considerations for measurement circuits.

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INA115AU

INA115AU - 1MHz Precision Instrumentation Amplifier | Texas Instruments

Texas Instruments INA115AU is a precision instrumentation amplifier with 1 MHz gain-bandwidth product, 50 µV maximum offset voltage, 11 nV/√Hz input noise, and 3 mA maximum quiescent current, housed in a 16-pin SOIC package. It is designed for low-level differential measurements where small sensor signals must be amplified accurately while rejecting common-mode interference. An instrumentation amplifier is a specialized amplifier category optimized for measuring a differential voltage superimposed on a larger common-mode voltage. Its internal three-op-amp topology provides high input impedance, accurate differential gain, and strong common-mode rejection. Within the broader hierarchy, an instrumentation amplifier is an analog amplifier, an analog integrated circuit, and ultimately a semiconductor designed for precision signal conditioning. The INA115AU combines switched gain operation, low input offset voltage, low drift, and low input bias current. Its specified maximum input offset voltage is 50 µV, maximum offset drift is 0.25 µV/°C, and maximum input bias current is 2 nA. Common-mode rejection reaches 115 dB minimum, while the device accepts input over-voltage protection up to ±40 V. These characteristics make the amplifier suitable for bridge outputs, current-shunt measurements, and low-level sensor interfaces. The wide supply range extends to ±18 V, with operating use supported from ±2.25 V according to the distributor data. Its 1 MHz bandwidth supports faster measurements than a purely high-resolution, slow instrumentation amplifier, while 11 nV/√Hz input noise preserves low-level signal integrity. A 16-pin SOIC package provides a conventional surface-mount footprint suitable for industrial, instrumentation, and test-equipment designs. Typical applications include precision bridge amplifiers, strain-gauge monitoring, laboratory sensor interfaces, current-shunt amplifiers, and industrial measurement systems. The switched gain function allows one amplifier to serve multiple sensitivity ranges, although the gain-setting network and feedback resistor accuracy must be checked carefully because they directly influence overall measurement accuracy. Designers should verify input common-mode limits, output swing, gain stability, and supply headroom under the intended load. Input protection improves tolerance to accidental over-voltage, but it does not remove the need for correct polarity, common-mode range, and output-swing analysis. Decoupling should follow the manufacturer datasheet guidance, and sensitive analog traces should be kept away from noisy switching paths. This page combines verified manufacturer highlights, distributor availability information, same-package alternative candidates, application guidance, and design cautions that help engineers move from part selection to a board-level implementation without overlooking the distinctions between instrumentation amplifiers.

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INA115AU-1

INA115AU-1 - 1 MHz Precision Instrumentation Amplifier | TI

Texas Instruments INA115AU-1 is a precision switched-gain instrumentation amplifier with a 1 MHz gain-bandwidth product, 50 uV input offset voltage, 11 nV/√Hz input noise, and 3 mA power consumption. The device is offered in a 16-pin SOIC package and is intended for low-level differential-signal conditioning. An instrumentation amplifier is a specialized analog amplifier that measures the voltage difference between two inputs while rejecting common-mode signals. Its internal three-op-amp architecture provides high input impedance, accurate differential gain, and a defined gain relationship, making it more convenient than a discrete difference amplifier for sensor front ends. Within the broader hierarchy, an instrumentation amplifier is an analog amplifier, a signal-conditioning IC, and part of a measurement and control system. The INA115 family combines precision input offset performance with low input-referred noise and a bandwidth of 1 MHz. Its switched-gain architecture permits gain to be selected through an external resistor connected to the gain-setting pin. The 50 uV offset specification and 11 nV/√Hz noise density are important when resolving millivolt-level or microvolt-level signals, while the 3 mA supply current supports low-power measurement systems. INA115AU-1 operates from dual supplies of ±2.25 V to ±18 V, as identified by Texas Instruments for the INA115AU/1K ordering configuration. The 0.06 V/us slew rate supports accurate settling of larger signal steps. Because the amplifier is designed for differential measurements, input-common-mode range, output swing, and input bias behavior must be checked against the actual signal and supply voltages before the circuit is released for production. Typical uses include bridge-transducer and strain-gauge front ends, precision current measurement, biomedical instrumentation, laboratory measurement equipment, and industrial sensor interfaces. The switched-gain capability simplifies systems in which several gain ranges are required, while the combination of 1 MHz bandwidth, 50 uV offset, and 11 nV/√Hz noise supports accurate signal capture without an unnecessarily high-power amplifier. The principal design consideration is the gain-setting resistor and its associated noise. Use a resistor with suitable low-noise characteristics and keep the gain network close to the gain pin to minimize parasitic capacitance. Input filtering, common-mode rejection, and output settling should be evaluated together because a high-bandwidth amplifier can amplify high-frequency interference as well as the wanted differential signal. This product page combines the exact manufacturer highlights with application guidance, package information, and a practical comparison of documented alternatives. It also highlights the distinction between electrical equivalence and packaging-only ordering codes, helping engineers make a board-level replacement decision without confusing tape-and-reel formats with functional alternatives.

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INA115BU

INA115BU - 1MHz Low-Noise INA | Texas Instruments

Texas Instruments INA115BU is a precision three-op-amp instrumentation amplifier rated for 1 MHz bandwidth, 50 uV maximum offset voltage, 11 nV/sqrt(Hz) input noise, and 3 mA maximum quiescent current. It is supplied in a 16-pin SOIC package and supports supply voltages from 2.25 V to 18 V, allowing operation from low-voltage analog systems through higher-voltage industrial instrumentation. An instrumentation amplifier is a differential analog signal-conditioning IC that amplifies the voltage between two inputs while rejecting common-mode interference. Its internal hierarchy is instrumentation amplifier, differential amplifier, analog amplifier, and semiconductor. The three-op-amp architecture uses resistive feedback to establish gain, high input impedance, and accurate differential gain control. Exposed input-amplifier connections permit switched-gain networks and alternative feedback arrangements. Key performance features include an offset voltage of 50 uV maximum, input voltage drift of 0.25 uV/degree C maximum, input bias current of 2 nA maximum, and common-mode rejection of 115 dB minimum. The device also provides input over-voltage protection to plus or minus 40 V, making it suitable for measurement interfaces where transient or fault conditions may exceed the normal common-mode range. The INA115BU combines 1 MHz bandwidth with 11 nV/sqrt(Hz) noise density. Its slew rate of 0.6 V/us supports accurate reproduction of moderate-frequency waveforms, while the external gain-setting network allows tradeoffs among gain, bandwidth, and noise. The instrumentation-amplifier topology is particularly useful when a low-level sensor differential must be measured in the presence of a larger common-mode voltage. Typical applications include bridge and strain-gauge signal conditioning, precision current measurement, biomedical instrumentation, industrial process-control sensors, and low-level differential data acquisition. The input-overvoltage protection and high common-mode rejection are useful in industrial environments, while low input bias current supports high-impedance sensor interfaces. Designers should place input and feedback resistors close to the device, maintain symmetric input routing, and verify stability with the intended gain network. Gain-setting resistance must also be checked against the required bandwidth, because the effective gain bandwidth relationship becomes increasingly important as closed-loop gain rises. This product summary combines the manufacturer specifications with practical guidance for gain selection, noise analysis, overvoltage protection, and PCB implementation. It also identifies verified nearby instrumentation amplifiers for engineers evaluating replacement or design-comparison requirements.

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INA116PA

INA116PA - 3fA Ultra Low Bias Current In-Amp | TI

The Texas Instruments INA116PA is an ultra-low input bias current instrumentation amplifier delivering 3 fA typical input bias current (25 fA at 85C), a 2 mV maximum input offset voltage, and programmable gain from 1 V/V to 1000 V/V in a 16-pin PDIP (N) package rated from -40C to +85C. An instrumentation amplifier is a specialized precision differential amplifier designed to amplify the difference between two input signals while rejecting common-mode voltage. Within the signal-chain hierarchy, it sits above general-purpose op amps in the amplifier family of analog ICs, combining three internal op-amp stages, precision matched resistors, and FET input technology to achieve performance that discrete designs cannot easily match. The headline feature of the INA116 is its Difet (dielectrically isolated FET) input stage with special guarding techniques that yield the 3 fA typical bias current at 25C. Buffered guard drive pins allow the designer to actively drive cable shields and guard rings, reducing leakage paths that would otherwise dominate performance at femtoampere input levels. Input overvoltage protection adds robustness against transient events at the inputs. The classic three-op-amp topology sets gain from 1 to 1000 V/V with a single external resistor, per the manufacturer datasheet. Minimum common-mode rejection is 86 dB, input noise is 28 nV per root hertz at 1 kHz, and quiescent current is only about 1 mA, permitting operation from +/-4.5 V to +/-18 V supplies (9 V to 36 V total). Typical applications include photodiode and ionization chamber front ends, pH and chemical sensor interfaces, electrometer-grade measurement systems, and precision transducer signal conditioning where source impedance is extremely high. Design consideration: at fA-level bias currents, PCB surface leakage dominates system error, so guard rings driven from the buffered guard outputs and careful board cleaning are essential. This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing, drop-in alternative analysis, comparison tables, and practical design guidance in one place.

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INA116UA

INA116UA - 3fA Ultra-Low Bias In-Amp SOIC-16 | Texas Instruments

The Texas Instruments INA116UA is an ultra-low input bias current instrumentation amplifier with 3 fA typical input bias current at 25C, 28 nV/Hz input noise at 1 kHz, and a 800 kHz bandwidth, housed in a 16-pin SOIC package (7.50 mm width). An instrumentation amplifier is a specialized differential amplifier designed to amplify the difference between two input signals while rejecting common-mode voltage. Within the signal-chain hierarchy, it sits above general-purpose op amps: an instrumentation amplifier (in-amp) is a precision differential amplifier -> amplifier IC -> analog signal conditioning IC. Unlike a standard op amp, an in-amp provides fixed or resistor-set gain without precision external resistor matching, making it the preferred front end for sensor bridges and transducer outputs. Key features of the INA116UA include Difet (dielectrically isolated FET) inputs achieving 3 fA bias at 25C and only 25 fA at 85C, buffered guard drive pins adjacent to both inputs that boot-strap cable and PCB leakage currents, a low 2 mV maximum input offset voltage, and a low 1 mA quiescent current. Its classic three-op-amp topology allows gain to be set from 1 V/V to 1000 V/V with a single external resistor. Technically, the guarded Difet input structure is what enables femtoampere-class bias currents: guard pins driven at the input common-mode potential intercept surface leakage paths on the PCB, so high-impedance sources such as pH electrodes, photodiodes, and ion chambers can be measured without input-current-induced errors. The 800 kHz bandwidth supports dynamic measurements at moderate gains. Typical applications include pH and ion-selective electrode front ends, photodiode and photomultiplier current monitoring, capacitive and piezoelectric sensor amplification, and precision laboratory electrometer circuits. Design consideration: the guard pins must be actively driven (bootstrapped) for the 3 fA specification to be realized on a practical PCB; without guarding, board leakage will dominate input current by orders of magnitude. This page synthesizes distributor pricing, packaging data, and practical guarding design notes not found in the manufacturer datasheet, with pricing as of 2026-09-13.

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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하위 카테고리

제품 (39,000+)

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