Texas Instruments INA2141U

Overview

INA2141U from Texas Instruments (originally Burr-Brown) is a dual, low-power instrumentation amplifier with laser-trimmed gain of 10 or 100 V/V, 50 µV max input offset voltage, 117 dB min CMR at G = 100, and ±2.25 V to ±18 V dual supply operation - used in precision thermocouple and bridge sensor signal conditioning.

For engineers reviewing the INA2141U datasheet, INA2141U pinout, INA2141U application, or INA2141U equivalent, key selection considerations include guaranteed gain accuracy (±0.05% max at G = 10), input overvoltage protection to ±40 V, low quiescent current (750 µA per amplifier), and dual-channel independence for multi-sensor systems.

Technical Context

The INA2141U implements a 3-op-amp current-feedback architecture enabling 200 kHz bandwidth at G = 100 and 1 MHz at G = 10 while maintaining low power consumption. Its dual-channel design features fully isolated bias networks and independent sense/Ref terminals per channel.

Each channel uses laser-trimmed internal thin-film resistors to set fixed gains of 10 or 100 V/V via jumper configuration - no external resistors required. Input overvoltage protection circuitry clamps to ±40 V without damage, even with supplies disconnected.

Key Specifications

Pinout & Package

INA2141U is housed in a 16-pin SOIC (DW package drawing), surface-mount package with 1.27 mm pitch, JEDEC MS-013 compliant, moisture sensitivity level 3 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2141U, INA2128UA trades laser-trimmed stability for gain flexibility, while AD8422ARZ offers superior CMR and lower offset in a smaller package but doubles component count and layout effort for dual-sensor systems.

Availability

INA2141U is available at Aetrix Electronics and suitable for precision sensor signal conditioning, medical instrumentation, and industrial data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA2141U 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-accuracy, low-power, and robust signal conditioning ICs for demanding applications.

The INA2141U belongs to TI's legacy instrumentation amplifier family designed specifically for dual-channel, fixed-gain, low-drift sensor front-ends in industrial and medical systems where reliability and long-term calibration stability are critical.

FAQ

What gain options does the INA2141U support, and how are they configured?

The INA2141U supports fixed gains of 10 V/V and 100 V/V per channel, selected by installing or omitting a low-resistance jumper across dedicated pins (pins 1–2 for Channel A, pins 9–10 for Channel B). No external resistors are required. The internal laser-trimmed resistor network ensures ±0.05% gain accuracy at G = 10. Installing a jumper introduces ≤0.1% error if series resistance exceeds 0.5 Ω. The INA2141U datasheet confirms this configuration applies identically to both channels.

Does the INA2141U require external offset trimming in typical applications?

No, the INA2141U does not require external offset trimming in most applications because it is laser trimmed to 50 µV max input offset voltage and 0.5 µV/°C max drift. The datasheet states "most applications require no external offset adjustment," and Figure 2 shows optional trimming only for cases demanding sub-µV residual offset. For standard industrial sensor interfaces using the INA2141U, the factory-trimmed performance is sufficient to meet accuracy requirements without additional circuitry.

Can the INA2141U operate from a single supply, or is dual-supply mandatory?

The INA2141U requires dual-symmetric supplies (±2.25 V to ±18 V) and cannot operate from a true single supply. Its input common-mode range extends from (V−) + 1.7 V to (V+) − 1.4 V, and output swing is referenced to Ref pins - both dependent on symmetric rail headroom. While some designs use split-rail generation from a single source (e.g., charge pump), the INA2141U itself mandates separate positive and negative supplies. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables of the INA2141U datasheet.

How does the INA2141U handle input overvoltage conditions beyond its specified range?

The INA2141U incorporates internal overvoltage protection circuitry that safely clamps inputs to ±40 V - even when power supplies are disconnected - limiting input current to 1.5–5 mA. This is confirmed in the Absolute Maximum Ratings table and the "Input Over-Voltage V/I Characteristics" curve (page 5). Unlike unprotected amplifiers, the INA2141U sustains no damage under such faults, eliminating the need for external series resistors or TVS diodes in many field applications. This protection applies independently to each input terminal of both channels.

What is the purpose of the SenseA and SenseB pins on the INA2141U?

SenseA (pin 5) and SenseB (pin 13) are dedicated output sense feedback terminals for Channels A and B, respectively. They must be connected directly to their corresponding output pins (VOA and VOB) for normal operation. When routed to the load instead of the amplifier output, they enable 4-wire Kelvin sensing to compensate for voltage drop across PCB traces or cables - improving DC accuracy in precision applications. This function is documented in the "APPLICATION INFORMATION" section and Figure 1 of the INA2141U datasheet.