INA141U - Precision Low-Power Instrumentation Amplifier | Texas Instruments
MPN: INA141U ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.75 | $6.75 |
| 10 | $6.75 | $67.50 |
| 100 | $6.75 | $675.00 |
| 500 | $6.75 | $3,375.00 |
| 1,000 | $6.75 | $6,750.00 |
INA141U Overview
An instrumentation amplifier is a specialized analog IC that amplifies the difference between two input voltages while rejecting signals common to both inputs. It belongs to the signal-conditioning and amplifier hierarchy, where instrumentation amplifiers are used ahead of analog-to-digital converters, measurement systems, sensors, and precision control equipment. The INA141U is intended for applications requiring high input impedance, accurate gain, low offset, and good common-mode rejection.
Key verified characteristics include a gain accuracy of ±0.05% at G = 10, maximum low input bias current of 5 nA, minimum common-mode rejection of 117 dB, input protection to ±40 V, and a wide ±18 V supply range. The listed low offset voltage is 50 µV maximum, with low drift specified at 0.5 µV/°C maximum. These features make the device suitable for low-level differential measurements and applications where common-mode noise or input-source imbalance could otherwise reduce measurement accuracy.
The INA141U combines a three-op-amp instrumentation-amplifier topology with a compact 8-pin SOIC package. The manufacturer describes current-feedback input circuitry and a bandwidth of 200 kHz at G = 100 V/V. This architecture supports a broader operating range than a simple resistive differential amplifier, although bandwidth, output swing, supply voltage, input common-mode range, and external gain-setting requirements must still be checked against the datasheet.
Typical uses include sensor-interface signal conditioning, bridge excitation and readout, industrial measurement systems, biomedical instrumentation, audio and communication front ends, and precision analog-to-digital converter inputs. The INA141 is specified for a −40°C to +85°C temperature range in the 8-pin SOIC package, making it suitable for industrial equipment where extended commercial temperature operation is required.
A practical design should begin by checking differential signal range, common-mode voltage, gain selection, supply headroom, output swing, and the input network. The gain is selected through the external resistor connected to the gain-setting pin according to the manufacturer application guidance. Keep input and feedback routing short, use a stable reference and resistor network where applicable, and provide decoupling close to the supply pins.
This page consolidates verified manufacturer and distributor information, practical design guidance, application context, and strict source traceability. Because the supplied data does not include a verified public pinout table, pricing tiers beyond the provided marketplace indication, or verified drop-in substitute specifications, those fields are conservatively marked for validation rather than inferred.
Drop-in alternatives for INA141U — 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 INA141U (same form factor and footprint) — differing in Architecture, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA141UA/2K5
✅ Drop-In📋 Reference alternative (not in catalog)
INA141UA
✅ Drop-In📋 Reference alternative (not in catalog)
INA141
✅ Drop-In📋 Reference alternative (not in catalog)
INA141U
✅ Drop-In✓ In Stock
$6.75 / Unit
View Datasheet →INA141UA/2K5
✅ Drop-In📋 Reference alternative (not in catalog)
INA141U Maximum Ratings & Electrical Characteristics
| Product Type | Precision, low-power instrumentation amplifier |
| Architecture | Three-op-amp instrumentation amplifier |
| Gain | 10 V/V or 100 V/V |
| Gain Accuracy | ±0.05% at G = 10 |
| Offset Voltage | 50 µV maximum |
| Offset Drift | 0.5 µV/°C maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection | 117 dB minimum |
| Input Protection | ±40 V |
| Supply Range | ±18 V |
| Bandwidth | 200 kHz at G = 100 V/V |
| Quiescent Current | 750 µA maximum |
| Package | 8-pin SOIC |
| Operating Temperature | −40°C to +85°C |
| RoHS Status | Green product; no Sb/Br |
| Input Protection Class | Differential and common-mode inputs protected to ±40 V |
INA141U 8-pin soic Pin Configuration Guide
Pin configuration for INA141U (8-pin soic package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA141U.
Refer to the datasheet for full pin configuration.
Typical Applications
INA141U is suitable for 6 applications: Bridge Sensor Signal Conditioning, Industrial Current and Voltage Measurement, Precision Analog-to-Digital Converter Front End, Medical and Biopotential Signal Conditioning, Audio and Communication Front Ends, Portable and Battery-Powered Instrumentation.
Bridge Sensor Signal Conditioning
INA141U fits low-level bridge measurements where a small differential sensor output must be amplified while common-mode voltage is present on both input lines. Its selectable gains of 10 V/V and 100 V/V, ±0.05% accuracy at G = 10, and 117 dB minimum common-mode rejection provide useful signal integrity. Place the amplifier at the bridge output, use the datasheet gain resistor arrangement, and keep the bridge excitation and sensitive input traces short. The 200 kHz bandwidth at G = 100 supports many slow-to-moderate-speed measurement systems, although sensor response and output settling must be checked.
Recommended
Industrial Current and Voltage Measurement
The INA141U is appropriate for industrial analog front ends that measure small differential voltages superimposed on a larger common-mode signal. Its 5 nA maximum input bias current reduces loading on high-impedance sources, while 50 µV maximum offset and 0.5 µV/°C maximum drift help maintain accuracy as temperature changes. Use it between the sensing element and an ADC or controller, observe the ±18 V supply limitation, and verify the input common-mode range for the selected gain. External filtering may be required when the measurement includes switching-converter ripple.
Recommended
Precision Analog-to-Digital Converter Front End
INA141U can condition a differential sensor or transducer signal before conversion by an ADC, especially when the source contains a substantial common-mode component. Gain can be selected as 10 V/V or 100 V/V, and the instrumentation topology avoids the resistor-matching burden of a discrete differential stage. Keep the amplifier-to-ADC path short, use suitable decoupling, and confirm that the output swing and settling behavior meet the ADC acquisition requirements. The 200 kHz figure is a verified bandwidth point at G = 100, not a guarantee of ADC settling time for every gain and load.
Recommended
Medical and Biopotential Signal Conditioning
INA141U may be used in low-level biomedical measurement paths when the front end requires differential gain and high input impedance, but its application suitability depends on the safety and regulatory requirements of the complete system. The verified 5 nA maximum input bias current and 117 dB minimum common-mode rejection can help preserve weak differential signals. Input protection is stated as ±40 V, but external isolation, clamping, leakage, and patient-safety design cannot be inferred from the IC rating. Validate the complete instrument against the applicable medical standards before connecting it to human subjects.
Recommended
Audio and Communication Front Ends
INA141U can serve as a differential input stage for audio or communication equipment when the source is balanced and the signal bandwidth is compatible with the amplifier. The 10 V/V and 100 V/V gain options provide useful scaling flexibility, while common-mode rejection helps isolate the intended differential signal. The designer should verify the 200 kHz bandwidth point at G = 100, output swing, supply noise sensitivity, and required filtering. For high-fidelity audio, additional low-noise power design, input protection, and careful grounding are necessary because the supplied data does not establish a specific audio noise figure.
Recommended
Portable and Battery-Powered Instrumentation
INA141U is suitable for portable measurement systems that need low-power differential signal conditioning. The verified low quiescent current is 750 µA maximum, and the device is available in an 8-pin SOIC package that supports compact layouts. Its low bias current can reduce loading on sensors, while the selectable gain allows the designer to increase signal level without using a higher-gain amplifier indiscriminately. Battery applications still require checking the full supply range, input common-mode limits, leakage paths, and protection current, since the quoted current is an IC specification rather than a complete system power budget.
Recommended
Recommended Products Summary
Engineering reference data for INA141U — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA141UA/2K5 | INA141UA | INA141 | INA141U | INA141UA/2K5 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC option | 8-pin SOIC | 8-pin SOIC |
Key Differentiators
- Precision gain accuracy (vs INA141UA)
- Low input bias current (vs INA141UA/2K5)
- Common-mode rejection (vs INA141)
- Input fault protection (vs INA141UA)
- Bandwidth at high gain (vs INA141UA/2K5)
Design Notes
Place the instrumentation amplifier close to the sensor or source so the differential input traces remain short and symmetric. Keep the two input routes away from switching nodes, motor windings, high-current returns, and clocks. Route the pair with a consistent ground reference and avoid creating a large loop between the input source and amplifier. Decoupling capacitors should be placed close to the supply pins, with their grounding arranged to minimize parasitic inductance.
Use the gain selection method and resistor values specified by the current Texas Instruments datasheet, and verify the resulting input common-mode range and output swing for every operating condition. The device is verified for gains of 10 V/V and 100 V/V and 200 kHz bandwidth at G = 100 V/V, but those figures do not guarantee the same settling performance at every gain, load, or supply voltage. Confirm source impedance, differential input capacitance, cable or connector effects, and ADC acquisition requirements before finalizing the front end.
The verified supply range extends to ±18 V, but the input signal and output voltage must remain within the usable operating region for the selected gain and supply combination. Do not infer that a ±18 V rating permits arbitrary ±18 V signal inputs or outputs. Add appropriate protection for transients beyond the stated ±40 V input-protection condition, and account for source current, clamp current, supply impedance, and amplifier power dissipation when selecting protection components.
Do not treat the SOIC package name as proof of pin compatibility. For any proposed substitute, compare the complete manufacturer pinout, gain-setting terminal, supply pins, input common-mode range, output swing, bandwidth, offset, bias current, and protection behavior. The supplied search data mentions INA141UA, INA141UA/2K5, INA141AID, and INA148UA comparisons, but it does not verify a distinct pin-to-pin replacement for INA141U. Use the official INA141 datasheet for production release.
Compliance Information
The supplied distributor-related data identifies INA141U as a Green product with no Sb/Br. RoHS status is treated as compliant based on that supplied statement. Reach, lead-free status, halogen-free status, conflict-minerals status, and automotive qualification are not explicitly verified in the supplied data.