Texas Instruments INA141U/2K5G4

Overview

INA141U/2K5G4 from Texas Instruments is a precision instrumentation amplifier with fixed gains of 10 V/V or 100 V/V, 50 µV max input offset voltage, 117 dB min CMR at G = 100, and 750 µA quiescent current - used in thermocouple amplification, bridge sensing, and medical ECG front-ends where low drift and high common-mode rejection are critical.

For engineers reviewing the INA141U/2K5G4 datasheet, INA141U/2K5G4 pinout, INA141U/2K5G4 application, or INA141U/2K5G4 equivalent, key selection considerations include gain configuration method (jumper-selectable), ±40 V input overvoltage protection, SO-8 package thermal resistance (150 °C/W), –40°C to +85°C operating range, and compatibility with low-voltage ±2.25 V supplies.

Technical Context

The INA141U/2K5G4 employs a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 while maintaining low power consumption. Its laser-trimmed thin-film resistors ensure ±0.05% gain accuracy at G = 10 and <0.5 µV/°C offset drift.

Input stage protection tolerates ±40 V differential or common-mode overvoltage independent of supply presence. The Ref pin establishes output reference level and requires low-impedance grounding to preserve >110 dB CMR; series resistance >8 Ω degrades CMR significantly.

Key Specifications

Pinout & Package

INA141U/2K5G4 is housed in an 8-pin SOIC (SO-8) surface-mount package with JEDEC MS-012AC footprint, 150 °C/W junction-to-ambient thermal resistance, and RoHS-compliant green finish (Pb-free, no Sb/Br).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with INA128UA/2K5 and AD8421ARMZ, the INA141U/2K5G4 offers the lowest quiescent current and best low-frequency noise for fixed-gain, battery-sensitive applications - but lacks programmable gain and has lower maximum supply voltage.

Availability

INA141U/2K5G4 is available at Aetrix Electronics and suitable for bridge amplifier circuits, thermocouple signal conditioning, and portable medical instrumentation requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.

Supply support for INA141U/2K5G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA141U/2K5G4 belongs to TI's precision instrumentation amplifier product line, designed specifically for high-accuracy DC-coupled sensor signal conditioning in space-constrained, low-power systems.

FAQ

What gain options does the INA141U/2K5G4 support, and how are they configured?

The INA141U/2K5G4 supports two fixed gains: 10 V/V and 100 V/V. Gain is selected by installing or omitting a low-resistance jumper between Pins 1 and 8. No external resistors are required. The internal laser-trimmed resistor network ensures ±0.05% gain accuracy at G = 10. For reliable operation, jumper resistance must remain below 0.5 Ω to avoid gain error exceeding specification limits in the INA141U/2K5G4.

Does the INA141U/2K5G4 require external input protection when interfacing with ±30 V transducers?

No, the INA141U/2K5G4 does not require external input protection for ±30 V transducers. Its inputs are individually protected to ±40 V - exceeding the ±30 V requirement - and this protection remains active even when power supplies are disconnected. Internal circuitry limits input current to 1.5–5 mA during overload, preventing damage. This capability is confirmed in the Absolute Maximum Ratings table and Input Over-Voltage V/I Characteristics curve of the INA141U/2K5G4 datasheet.

How does the Ref pin affect common-mode rejection in the INA141U/2K5G4?

The Ref pin sets the output reference level and directly impacts common-mode rejection ratio (CMR). To maintain >110 dB CMR, the Ref pin must be connected to a low-impedance node - ideally ground - with series resistance ≤8 Ω. Higher impedance introduces CMR degradation; for example, 8 Ω in series reduces typical CMR to ~80 dB at G = 1. This behavior is documented in the Application Information section and verified in typical performance curves for the INA141U/2K5G4.

Can the INA141U/2K5G4 operate from a single +5 V supply?

No, the INA141U/2K5G4 cannot operate from a single +5 V supply. It requires dual supplies (e.g., ±2.25 V to ±18 V) as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. The input common-mode range extends only to (V+) – 1.4 V and (V–) + 1.7 V, and the output swing is centered around the Ref pin potential - both functions depend on symmetric or bipolar rails. Attempting single-supply operation will result in input saturation and invalid output behavior in the INA141U/2K5G4.

What is the maximum bandwidth achievable with the INA141U/2K5G4 at G = 100?

The maximum small-signal bandwidth of the INA141U/2K5G4 at G = 100 is 200 kHz (–3 dB point), as measured under standard conditions (T_A = +25°C, V_S = ±15 V, R_L = 10 kΩ). This bandwidth is enabled by its current-feedback architecture and is validated in the Gain vs Frequency typical performance curve. At G = 10, bandwidth increases to 1 MHz. These values are guaranteed minimums per the specifications table for the INA141U/2K5G4.