INA141PA - Precision 10/100 V/V Instrumentation Amplifier | Texas Instruments
MPN: INA141PA ✓ ActiveINA141PA Overview
An instrumentation amplifier is a specialized amplifier category that combines differential input measurement, high input impedance, accurate gain setting, and strong common-mode rejection into one device. It sits between sensors, bridge transducers, and precision converters in the signal-chain hierarchy: instrumentation amplifier -> operational amplifier -> analog signal-processing IC. The INA141PA uses a three-op-amp instrumentation-amplifier architecture with current-feedback input circuitry. According to the Texas Instruments datasheet, this configuration maintains a bandwidth of 200 kHz even at a gain of 100 V/V.
Key features include accurate gain selection, low offset drift of 0.5 µV/°C maximum, low quiescent current, and operation across a -40 °C to +85 °C temperature range. The 10 V/V and 100 V/V gain choices make the device useful for bridge sensors, biomedical instrumentation, current measurement, and industrial sensor interfaces where the signal is small relative to the common-mode voltage.
The INA141PA is available in an 8-pin plastic DIP package, which is useful for through-hole prototypes, laboratory equipment, and legacy industrial boards. The DIP package also provides a straightforward mechanical format for socket-based designs. Its input protection rating of ±40 V helps protect the measurement inputs when external wiring or sensors can present transients beyond the normal operating signal range.
Typical applications include strain-gauge and RTD bridge amplifiers, precision current shunt measurements, ECG and other biomedical instrumentation, sensor acquisition modules, and laboratory test equipment. The main design consideration is ensuring the common-mode voltage, supply rails, gain configuration, and input protection limits remain within the device specifications. Stable reference bypassing and careful grounding are also important when measuring microvolt-level signals.
This page synthesizes the verified manufacturer information, package details, technical trade-offs, and drop-in replacement considerations to support faster component selection, PCB planning, and purchasing decisions.
Drop-in alternatives for INA141PA — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA141PA (same form factor and footprint) — differing in Architecture, Package, Product Type, Supply Voltage Range, Maximum Offset Drift.
INA141P
✅ Drop-InContact for price
View Datasheet →INA131AP-1
✅ Drop-In📋 Reference alternative (not in catalog)
INA126P
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →INA128P
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →INA129P
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →INA141PA Maximum Ratings & Electrical Characteristics
| Product Type | Precision instrumentation amplifier |
| Gain | 10 V/V or 100 V/V |
| Architecture | Three-op-amp instrumentation amplifier |
| Input Protection | ±40 V |
| Supply Range | ±18 V |
| Offset Voltage | 50 µV maximum |
| Offset Drift | 0.5 µV/°C maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection | 117 dB minimum |
| Bandwidth at Gain 100 V/V | 200 kHz |
| Operating Temperature | -40 °C to +85 °C |
| Package | 8-pin plastic DIP |
| Mounting Type | Through-hole |
| Number of Circuits | 1 circuit |
INA141PA Pin Configuration
| Pin 1 | RG — Gain-setting resistor connection |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Noninverting input |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | REF — Reference input |
| Pin 6 | OUT — Amplified output |
| Pin 7 | V+ — Positive supply connection |
| Pin 8 | RG — Gain-setting resistor connection |
Typical Applications
INA141PA is suitable for 6 applications: Precision Bridge Sensor Measurement, Industrial Current Shunt Amplification, Biomedical Signal Acquisition, Sensor Interface and Data Acquisition, Laboratory Measurement Instrumentation, Battery-Powered Portable Instrument.
Precision Bridge Sensor Measurement
The INA141PA fits strain-gauge, load-cell, and resistive bridge measurements where the useful signal is differential and the bridge excitation establishes a substantial common-mode level. Its selectable 10 V/V or 100 V/V gain reduces the need for a separate gain stage, while 117 dB minimum common-mode rejection helps preserve small changes in bridge output. The 50 µV maximum offset voltage is particularly relevant when the full-scale sensor signal is also small. Place the instrumentation amplifier close to the bridge, maintain symmetric input routing, and connect the reference input to a quiet low-impedance reference. Verify that the bridge excitation, common-mode voltage, and output swing remain compatible with the ±18 V supply range.
Recommended
Industrial Current Shunt Amplification
The INA141PA is appropriate for measuring the voltage developed across a precision shunt in power-conversion, motor-control, and laboratory equipment. A 10 V/V gain is useful for moderate shunt signals, while 100 V/V gain can increase sensitivity for low-current measurements. The low 5 nA maximum input bias current reduces current error through the sensing element, and 117 dB minimum common-mode rejection supports operation when the shunt sits near a switching or bus voltage. The ±40 V input-protection rating is useful for transients around high-current systems. Designers should still place series input resistance as recommended in the datasheet and verify that the shunt common-mode voltage never exceeds the amplifier's operating limits.
Recommended
Biomedical Signal Acquisition
The INA141PA can be used in low-level biomedical front ends where offset and common-mode errors would otherwise obscure a small differential signal. Its 50 µV maximum offset voltage, 0.5 µV/°C maximum drift, 5 nA maximum input bias current, and 117 dB minimum common-mode rejection are useful for bridge-based pressure, strain, and bioelectrical interfaces. The three-op-amp architecture simplifies implementation compared with a discrete difference amplifier. For patient-connected designs, however, the INA141PA alone does not establish medical safety; isolation, protection leakage, electrode biasing, and regulatory requirements must be addressed by the complete signal chain. Confirm electrode DC offset and common-mode range against the device limits.
Recommended
Sensor Interface and Data Acquisition
The INA141PA supports sensor-interface boards that must amplify small differential outputs before digitization. Selectable gains of 10 V/V and 100 V/V provide useful scaling for pressure, temperature, position, and resistive sensors, while 200 kHz bandwidth at 100 V/V supports moderately fast measurements. The 8-PDIP package is convenient for through-hole prototypes and educational or legacy acquisition systems. For best results, place input and reference components near the device, use a low-noise reference at the REF pin, and route high-impedance input traces away from switching nodes. The datasheet's -40 °C to +85 °C operating range supports many industrial environments, but system enclosure temperature and thermal rise must be checked separately.
Recommended
Laboratory Measurement Instrumentation
The INA141PA is useful in laboratory instruments that combine a low-level sensor with precision analog measurement. Its low offset voltage and drift reduce measurement uncertainty, and its high common-mode rejection improves signal integrity when the sensor output is referenced to a larger voltage. The selectable 10 V/V or 100 V/V gain permits the same amplifier family to cover several input ranges. The through-hole 8-PDIP format simplifies construction in laboratory fixtures and retrofit boards. Designers should provide a clean reference, observe correct supply bypassing, and avoid placing the input or reference return near high-current switching paths. Because the visible verified data does not provide numeric pricing or every electrical limit, engineers should confirm remaining values in the current manufacturer datasheet.
Recommended
Battery-Powered Portable Instrument
The INA141PA can be used in portable measurement equipment where low power and precision are both important. Texas Instruments describes the INA141 as a low-power general-purpose instrumentation amplifier, and the device offers selectable gain to reduce the need for multiple analog paths. Its 8-pin plastic DIP package is practical for prototypes, although a surface-mount option may be preferable for a final compact product. Power-system design should account for the actual supply voltage, quiescent current from the manufacturer datasheet, and the power consumed by external gain-setting components. A single positive supply requires careful output and reference-voltage design, whereas dual supplies simplify signal centering. Confirm the complete current budget and battery operating range before selecting the device.
Recommended
Recommended Products Summary
Engineering reference data for INA141PA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA141P | INA131AP-1 | INA126P | INA128P | INA129P |
|---|---|---|---|---|---|---|
| Package | 8-PDIP | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
Key Differentiators
- Verified same-family 8-PDIP substitution path (vs INA131AP-1)
- High-gain operation retains useful bandwidth (vs INA141P)
- Precision offset performance for differential sensors (vs INA131AP-1)
Design Notes
Do not confuse the ±40 V input-protection rating with the ±18 V normal supply range. The protected input rating is a maximum stress condition, not permission to operate the input above the specified common-mode range. Check the INA141 datasheet for the exact input and output limits under each supply condition, and ensure that external transients are controlled before they reach the amplifier.
Route the differential inputs as a compact, symmetrical pair and keep them away from switching nodes, relay contacts, and high-current return paths. The REF connection should be driven from a low-impedance, low-noise source, because reference noise can appear directly at the output. Use the gain-setting resistor exactly as specified by the manufacturer and avoid long exposed input traces that can increase leakage and noise pickup.
Decouple each supply rail close to the device and follow the manufacturer-recommended capacitor network. The INA141PA supports ±18 V supplies, but its usable output range still depends on the selected rail voltages and the reference voltage. In single-supply operation, verify output-headroom limits and choose the REF voltage carefully so the measured signal remains within the linear output range.
Compliance Information
The supplied verified snippets do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
