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INA101KU - High Accuracy Instrumentation Amp | Texas Instruments
The Texas Instruments INA101KU is a very high accuracy instrumentation amplifier with 25 uV maximum input offset voltage, 0.25 uV/C maximum offset drift, and 0.002% maximum nonlinearity, housed in a 16-pin SOIC (DW, SOL-16) surface-mount package. An instrumentation amplifier is a specialized differential amplifier designed to amplify small sensor signals while rejecting common-mode noise. It sits at the front end of the signal chain hierarchy: sensor -> instrumentation amplifier -> filter -> ADC. Unlike a standard op amp, an instrumentation amplifier provides a user-set gain via a single external resistor, extremely high common-mode rejection (CMR at 60 Hz), very high input impedance, and matched, high-impedance differential inputs, making it the standard choice for precision bridge and transducer readout. Key features of the INA101KU include 13 nV/Hz input-referred voltage noise, high common-mode rejection at 60 Hz (targeted at 50/60 Hz line-noise rejection), input impedance of 10^10 ohm, and a classic three-amplifier topology on a single monolithic die. These parameters directly improve system accuracy: the 25 uV offset and 0.25 uV/C drift eliminate the need for external offset trimming in most strain-gage applications, and 0.002% nonlinearity preserves end-to-end measurement integrity over a wide gain range. Architecturally, the INA101 uses three internally compensated amplifiers configured as a classic two-stage instrumentation amplifier, with gain set by one external resistor RG (G = 1 + 40 kOhm/RG). It operates from dual supplies of +/-5 V to +/-20 V with a slew rate of 0.4 V/uS and a bandwidth of approximately 25 kHz, sufficient for static and low-frequency dynamic measurements. Typical applications include strain-gage bridge amplifiers, thermocouple and RTD conditioning, weigh scales, low-level data acquisition front ends, and medical transducer interfaces where microvolt-level signals must be amplified in electrically noisy environments. Design consideration: at high gains, keep the gain resistor RG traces short and use a low-drift, low-TCR resistor, since RG mismatch and self-heating directly degrade gain accuracy and drift. This page synthesizes distributor pricing, drop-in alternatives, cross-reference data, and practical design notes not consolidated in the manufacturer datasheet.
INA101KU/1K - High Accuracy Instrumentation Amplifier | TI
The Texas Instruments INA101KU/1K is a very high accuracy instrumentation amplifier with 25 uV maximum offset voltage, 0.25 uV/C maximum offset drift, and 0.002% maximum nonlinearity, housed in a 16-pin SOIC (DW) surface-mount package. An instrumentation amplifier is a specialized differential amplifier designed to amplify the difference between two input signals while rejecting common-mode voltage. Unlike a general-purpose operational amplifier, an instrumentation amplifier (in-amp) provides a fixed or gain-set internal architecture, very high input impedance, and high common-mode rejection, making it a key building block in the precision analog signal chain hierarchy: instrumentation amplifier -> precision amplifier -> analog front end -> signal conditioning system. Key features include ultra-low input offset voltage of 25 uV max, low offset temperature drift of 0.25 uV/C max, nonlinearity of just 0.002%, and low input noise of 13 nV/sqrt(Hz). The device also provides high common-mode rejection at 60 Hz and very high input impedance of 10^10 ohms, which allows direct connection to high-impedance sources such as strain gauge bridges without loading errors. The INA101 architecture integrates three internally matched operational amplifiers with a single external resistor setting the gain, preserving offset and drift performance across the gain range that would be difficult to achieve with discrete op-amp designs. Gain is configured via external resistor according to the manufacturer datasheet formula, enabling gains from 1 to over 1000 V/V. Typical applications include strain gauge and weigh-scale bridge amplification, thermocouple and RTD temperature measurement front ends, industrial process-control signal conditioning, and medical biopotential acquisition where microvolt-level signals must be extracted in the presence of large common-mode interference such as 50/60 Hz mains hum. When designing with the INA101KU/1K, keep gain-setting resistor traces short and use low-drift resistors to avoid degrading the intrinsic 0.25 uV/C offset drift. Careful grounding and a guard ring around the input pins preserve the high input impedance and CMR at 60 Hz. This page synthesizes distributor pricing, verified drop-in alternatives, practical design notes, and application guidance not found in the manufacturer datasheet alone.
INA101SG - Military High Accuracy Instrumentation Amplifier | TI
The Texas Instruments INA101SG is a very high accuracy instrumentation amplifier, originally introduced by Burr-Brown, delivered in a 14-pin ceramic DIP (CDIP-14) package and qualified to a military temperature grade. Headline specifications include a maximum offset voltage drift of 0.25 uV/C, a maximum input offset voltage of 25 uV, and low nonlinearity of 0.002%, with input voltage noise of 13 nV/Hz. An instrumentation amplifier is a specialized differential amplifier designed to amplify the small difference between two input signals while rejecting any voltage common to both inputs. Within the signal-chain hierarchy (instrumentation amplifier -> precision differential amplifier -> operational amplifier -> analog front end), it provides the high common-mode rejection and high input impedance that single op-amp stages cannot achieve, making it the standard front end for bridge transducers and low-level sensor signals. Key features of the INA101SG include its three-op-amp topology with laser-trimmed metal-film resistors integrated on a single monolithic die, which delivers the tight resistor matching responsible for 0.002% nonlinearity and high CMR at 60 Hz. Input impedance is approximately 10^10 ohms, so the device loads bridges and high-impedance sources negligibly. Gain is set by a single external resistor, and the ceramic DIP package supports hermetic, high-reliability military and aerospace assemblies. The bipolar process and precision trimming give the INA101 family its signature combination of microvolt-level offset and sub-microvolt-per-degree drift. Compared with discrete three-op-amp front ends, the monolithic construction guarantees resistor ratio tracking over temperature, which is the dominant error source in precision differential measurements. Typical applications include strain-gauge bridge amplification, thermocouple and RTD signal conditioning, and general-purpose data-acquisition front ends where low-level differential signals must be amplified with minimal added error. Design-wise, keep gain-setting resistor leads short and use a Kelvin ground for the reference pin; offset and drift specifications are guaranteed only when the reference pin is driven from a low-impedance source. This page synthesizes verified distributor data, family cross-references, and practical design guidance not consolidated in the manufacturer datasheet.
INA101SM - High Accuracy Instrumentation Amplifier | TI
The Texas Instruments INA101SM is a very high accuracy instrumentation amplifier for low-level signal amplification and general-purpose data acquisition, packaged in a 10-pin TO-100 package. It integrates three precision operational amplifiers and laser-trimmed metal-film resistors on one monolithic IC. The verified data identifies a maximum input offset voltage of 25 uV, maximum input drift of 0.25 uV/°C, low nonlinearity of 0.002%, and input-referred noise of 13 nV/√Hz. These characteristics make the device suitable for precision bridge, strain-gauge, sensor, and biomedical signal-chain designs where offset and drift errors must remain small relative to the measured signal. An instrumentation amplifier is a specialized differential amplifier optimized for measuring small signals superimposed on a large common-mode voltage. Its internal gain-setting network and three-op-amp architecture provide high input impedance, controlled gain, and strong common-mode rejection. In the broader semiconductor hierarchy, an instrumentation amplifier is an analog signal-conditioning amplifier, a linear amplifier, and ultimately an integrated circuit used within data-acquisition and measurement systems. The INA101 is intended to preserve signal integrity from sensor excitation through differential amplification. Key features include a 13 nV/√Hz noise density, 25 uV maximum offset voltage, 0.25 uV/°C maximum drift, and 0.002% low nonlinearity. Its integrated precision resistors reduce external gain-setting components and help establish repeatable performance between assemblies. The high input impedance prevents the amplifier from significantly loading the source, while common-mode rejection is important when the wanted differential signal is much smaller than the voltage shared by both input terminals. The verified data describes the INA101 as a monolithic integrated circuit combining three precision op amps with laser-trimmed metal-film resistors. The design is suited to precision amplification of differential inputs rather than single-ended audio or general logic signals. Comparison information identifies a typical dual-supply condition of ±15 V, with an indicated minimum of ±5 V and maximum of ±20 V; maximum power dissipation is listed as 600 mW. These operating details must be checked against the complete manufacturer datasheet for design limits and test conditions. Typical applications include strain-gauge bridge excitation and measurement, low-level sensor acquisition, biomedical instrumentation, and general-purpose differential data acquisition. In a bridge circuit, the small millivolt-level differential output can be amplified while the instrumentation amplifier rejects common-mode excitation and prevents source loading. In biomedical or industrial measurement systems, the combination of low offset, low drift, and high input impedance helps preserve measurements over time and across varying source impedances. Designers should confirm the exact pin assignments, gain configuration, supply sequencing, common-mode range, and output-swing limits in the manufacturer datasheet before layout. Because this through-hole TO-100 device can dissipate up to 600 mW according to the verified comparison data, adequate PCB copper and thermal spacing should be provided. Input and reference-ground connections should be kept short, and the gain-setting method should follow the datasheet's recommended resistor topology. This page combines verified manufacturer and distributor information, source traceability, application guidance, and a disciplined alternative assessment. The available cross-reference results did not establish five verified, pin-compatible drop-in parts in the same package, so no unsupported replacements are presented as drop-in equivalents.
INA103KP - 6 MHz Low-Noise Instrumentation Amplifier | TI
The Texas Instruments INA103KP is a low-noise, low-distortion monolithic instrumentation amplifier with 1 nV/√Hz noise density, 6 MHz bandwidth, and greater than 100 dB common-mode rejection in a 16-pin PDIP package. Designed for differential low-level signal acquisition, it combines current-feedback circuitry, internal gain-setting resistors, and a wide ±25 V supply range. The INA103KP is particularly suited to balanced low-impedance microphone and other precision audio inputs, where low source impedance allows the amplifier to approach its theoretical noise-performance limit. An instrumentation amplifier is a differential amplifier optimized for measuring small signals superimposed on larger common-mode voltages. Its internal architecture provides accurate differential gain while rejecting common-mode interference, making it more suitable than a general-purpose op amp when source signals are balanced, sensor outputs are small, or grounding noise is difficult to control. The INA103KP belongs to the broader signal-conditioning IC hierarchy: instrumentation amplifier, differential amplifier, analog signal-conditioning IC, and semiconductor. The device offers a 6 MHz gain-bandwidth product, 1 nV/√Hz input-noise density, and common-mode rejection greater than 100 dB. Its current-feedback topology supports wide bandwidth and fast dynamic response. Internal gain-setting resistors simplify circuit construction, while the manufacturer identifies the INA103 as an upgrade path for designs previously based on the AD625. These characteristics allow low-level signals to be amplified without relying on an extremely high closed-loop gain. Typical uses include balanced low-impedance microphones, low-level audio acquisition, industrial measurement systems, instrumentation interfaces, and precision differential sensor inputs. The 16-pin PDIP package provides through-hole accessibility and straightforward prototype assembly. Its relatively high bandwidth makes it suitable for signals extending beyond conventional audio-band instrumentation, although system-level filtering and stability analysis remain necessary. A primary design consideration is source impedance. The manufacturer states that near-theoretical noise performance is obtained with a 200 Ω source impedance, so cable, microphone, or transducer impedance directly affects achievable signal-to-noise ratio. Designers should also verify supply headroom, input common-mode range, gain configuration, output swing, and stability for the selected feedback network using the manufacturer datasheet. This product data combines manufacturer specifications, current distributor evidence, application guidance, and explicitly identified gaps. It distinguishes verified drop-in replacement evidence from merely similar or functionally equivalent parts, helping engineers avoid treating package-compatible substitution as a safe assumption.
INA106KP - Precision Gain 10 Differential Amplifier | Texas Instruments
The Texas Instruments INA106KP is a precision fixed-gain differential amplifier with a nominal gain of 10, supplied in an 8-pin plastic DIP package. It integrates a precision operational amplifier with on-chip metal-film resistors, and the resistor network is laser trimmed for accurate gain and high common-mode rejection. The fixed gain architecture simplifies instrumentation circuits that require differential input measurement without external gain-setting resistors. The verified product data identifies INA106KP as a one-circuit, 8-pin differential amplifier. A differential amplifier is a circuit that amplifies the voltage difference between two input terminals while rejecting common-mode signals. In the broader semiconductor hierarchy, the INA106KP belongs to the instrumentation amplifier and special-purpose amplifier family, within the amplifier IC and analog signal-processing categories. Its integrated precision resistor network is designed to improve gain accuracy and common-mode rejection while reducing the number of external components required in sensor, bridge, and measurement applications. The INA106 family is specified as a gain-of-10 differential amplifier. The manufacturer describes the device as using a precision operational amplifier together with on-chip metal-film resistors. These resistors are laser trimmed for accurate gain and high common-mode rejection, while their temperature coefficient tracking is intended to preserve gain accuracy and CMRR over temperature. The available verified data does not provide the complete electrical limits, so detailed voltage, current, bandwidth, and temperature specifications are marked as data needed below rather than estimated. Typical uses include conditioning low-level differential sensor signals, bridge outputs, current-shunt measurements, and industrial instrumentation where a fixed gain of 10 is suitable. Because the gain is integrated and fixed, the device is most useful when the system designer wants repeatable gain accuracy without selecting and balancing external precision resistors. The PCB footprint should use the manufacturer’s 8-pin plastic DIP drawing, with supply and signal routing completed according to the datasheet’s recommended layout. A key design consideration is that the INA106KP is not a general-purpose unity-gain op-amp substitute. Its fixed gain, internal resistor network, input topology, supply requirements, and pin functions must match the original circuit. Designers should confirm differential input range, common-mode range, output swing, supply voltage, noise, and stability requirements against the current INA106 datasheet before production use. This page consolidates verified manufacturer and distributor information, documented package details, engineering application guidance, and a strict drop-in replacement review. It distinguishes confirmed INA106KP facts from parameters that require confirmation from the manufacturer datasheet, helping engineers shortlist the part without presenting unverified electrical values as facts.
INA106U - Gain 10 Differential Amplifier | Texas Instruments
The Texas Instruments INA106U is a precision fixed-gain differential amplifier with a nominal gain of 10, 86 dB minimum common-mode rejection, and an 8-pin SOIC package. The device is designed for accurate differential measurement and signal conditioning where common-mode noise must be rejected before downstream amplification or conversion. Its monolithic construction combines a precision operational amplifier with laser-trimmed on-chip metal-film resistors. A differential amplifier is a circuit that amplifies the voltage difference between two input terminals while suppressing voltage common to both inputs. In the signal-chain hierarchy, differential amplification sits between sensors or front ends and higher-gain analog processing. The INA106 family is commonly used for bridge, current, and instrumentation-amplifier input stages where preserving small differential signals is more important than accepting large common-mode signals. Key documented features include accurate gain of ±0.025% maximum, common-mode rejection of 86 dB minimum, and nonlinearity of 0.001% maximum. The laser-trimmed resistor network is intended to maintain accurate gain and common-mode rejection over temperature. The manufacturer describes applications including a gain-of-10 differential amplifier, a -10 amplifier, and a +11 amplifier configuration. The available INA106 family packages include 8-pin plastic DIP and SOIC options, while INA106U specifically denotes the SOIC ordering variant. The internal architecture is important because the matched resistor network determines gain accuracy and common-mode behavior. Unlike a discrete implementation using an operational amplifier and four external resistors, the integrated approach reduces resistor-matching variability and simplifies the physical circuit. The device should be evaluated against its complete datasheet electrical limits, including supply voltage, input range, output swing, frequency response, and temperature limits. Typical applications include precision bridge excitation and sensing, instrumentation front ends, current measurement, sensor signal conditioning, and rejection of common-mode noise in industrial control systems. The SOIC-8 package is suitable for conventional surface-mount assembly, but exposed thermal performance and output-drive limits still depend on the exact operating conditions. For layout, keep input traces short and symmetric, provide a clean reference connection, and place input filtering close to the amplifier. Confirm common-mode and output-swing limits before selecting external gain resistors or adding downstream gain. The fixed internal gain also means changing the system gain generally requires a different amplifier rather than an external resistor adjustment. This page combines the verified Texas Instruments product and datasheet information, distributor references, package guidance, and practical selection considerations. It is intended to help engineers identify whether the INA106U fixed-gain architecture matches the required accuracy, common-mode rejection, package, and supply conditions.
INA111BP - 2MHz FET-Input Instrumentation Amp | Texas Instruments
Texas Instruments INA111BP is a high-speed, FET-input instrumentation amplifier with 2 MHz bandwidth at a gain of 10, 17 V/us slew rate, and low input bias current of 20 pA maximum, housed in an 8-pin PDIP package. The single-circuit device supports externally selected gains from 1 to more than 1000 through one resistor and uses a current-feedback topology to maintain speed at higher closed-loop gains. An instrumentation amplifier is a specialized analog signal-conditioning IC designed to amplify small differential sensor signals while rejecting common-mode voltage. The INA111 belongs to the instrumentation-amplifier hierarchy, which combines differential input, high input impedance, precise gain setting, and common-mode rejection. Its FET inputs suit high-impedance transducers, while laser-trimmed offset characteristics support accurate measurement of low-level signals. Key features include a 20 pA maximum input bias current, 500 uV maximum offset voltage, 5 uV/°C maximum offset drift, and 106 dB minimum common-mode rejection. The INA111 settles to 0.01% in 4 us at a gain of 100. These characteristics make the device useful where fast acquisition and high source impedance must coexist with accurate differential amplification. The current-feedback architecture differentiates the INA111 from conventional voltage-feedback instrumentation amplifiers. It provides extended bandwidth of 2 MHz at a gain of 10 and a 17 V/us high slew rate, improving response to rapidly changing inputs. Gain is set by one external resistor, while the internal resistor network supports gain selections that do not require that external component. Typical applications include bridge-sensor signal conditioning, industrial process measurement, biomedical instrumentation, current-shunt monitoring, and precision data-acquisition systems. The low input bias current is particularly useful with high-impedance sources, while the 2 MHz bandwidth benefits sampled or multiplexed measurement systems requiring short acquisition times. When designing around the INA111BP, verify the input and output voltage limits, supply headroom, and common-mode range for the intended signal. Place the gain-setting resistor close to the appropriate RG pins, maintain symmetric input routing, and use adequate bypassing at the supply pins to preserve bandwidth and minimize added noise. This page combines verified manufacturer specifications, distributor pricing, same-package replacement guidance, comparison parameters, and practical design notes. It is intended to help engineers evaluate the INA111BP beyond a basic distributor listing while highlighting the checks required before substituting any pin-compatible device.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.