Texas Instruments INA2141P

Overview

INA2141P from Burr-Brown (now Texas Instruments) is a dual, low-power instrumentation amplifier with fixed gains of 10 V/V or 100 V/V, laser-trimmed for 50 µV max input offset voltage, 0.5 µV/°C max drift, and 117 dB min CMR at G = 100. It operates from ±2.25 V to ±18 V supplies and draws only 750 µA per channel-ideal for precision sensor signal conditioning in battery-powered medical and industrial systems.

For engineers reviewing the INA2141P datasheet, INA2141P pinout, INA2141P application, or INA2141P equivalent, key selection considerations include its dual-channel architecture, internal gain-setting resistors, ±40 V input overvoltage protection, guaranteed performance across –40°C to +85°C, and compatibility with thermocouple, RTD, and bridge-based measurement topologies.

Technical Context

The INA2141P implements a 3-op-amp current-feedback topology enabling 200 kHz bandwidth at G = 100 and 1 MHz at G = 10 while maintaining low quiescent current. Its dual independent channels share no bias circuitry, ensuring negligible crosstalk below 100 kHz.

Gain is selected per channel via jumper configuration (open = G = 10, shorted = G = 100), using laser-trimmed internal 40 kΩ and 252 Ω resistor networks. Input overvoltage protection clamps ±40 V inputs without damage, even with supplies disconnected.

Key Specifications

Pinout & Package

INA2141P is supplied in a 16-pin plastic DIP package (drawing 180), through-hole mounted, rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2128UA and AD8422ARZ, the INA2141P delivers lowest power (750 µA/channel) and best value for fixed-gain dual-channel applications-its laser-trimmed 50 µV offset and ±40 V input protection are unmatched in its class for battery-operated sensor nodes.

Availability

INA2141P is available at Aetrix Electronics and suitable for thermocouple amplification, bridge sensor interfacing, ECG front-end design, and multi-channel data acquisition requiring stable component supply and long-term obsolescence management.

Supply support for INA2141P 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

Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog signal conditioning ICs for test & measurement and industrial control.

The INA2141P belongs to Burr-Brown's dual instrumentation amplifier product line, engineered specifically for low-power, high-accuracy DC-coupled sensor signal conditioning in medical, industrial, and portable instrumentation.

FAQ

What are the exact gain options supported by the INA2141P?

The INA2141P supports only two precise, factory-laser-trimmed gain settings per channel: 10 V/V (jumper open) and 100 V/V (jumper shorted). These values are guaranteed to ±0.05% at G = 10 and ±0.075% at G = 100 across temperature. External resistor networks cannot reliably achieve intermediate gains due to ±25% internal resistor tolerance-use INA2128 for programmable gain.

Does the INA2141P require external components for basic operation?

No-INA2141P requires only power supplies (±2.25 V to ±18 V), input signals, and output loads. Gain is set by jumpers; Ref and Sense pins must be connected as specified (Ref to low-impedance ground, Sense to respective VO). Decoupling capacitors (0.1 µF) near V+/V– are recommended for noisy supplies, but not mandatory for bench evaluation.

Can the INA2141P operate from a single supply?

Yes-the INA2141P supports single-supply operation when biased appropriately. For example, with V+ = +5 V and V– = 0 V, inputs must remain within (V–) + 1.7 V to (V+) – 1.4 V (i.e., 1.7 V to 3.6 V), and Ref pins should be tied to mid-supply (2.5 V) via low-impedance source. Output swing will be 0.9 V to 4.1 V at RL = 10 kΩ.

What is the maximum safe input voltage for the INA2141P?

The INA2141P inputs are protected to ±40 V-meaning either input can withstand –40 V to +40 V continuously, even with power supplies disconnected. This rating applies independently per input; simultaneous application of –40 V on one input and +40 V on the other is safe. Exceeding ±40 V risks permanent damage to internal protection diodes.

How does channel crosstalk behave in the INA2141P?

INA2141P features fully independent bias networks and signal paths per channel, resulting in <–100 dB crosstalk at DC and low frequencies. Crosstalk rises with frequency-reaching ~–60 dB at 100 kHz (G = 100)-primarily due to capacitive coupling. Layout best practices (guard traces, separated input routing) reduce this further; it does not affect static or slow-varying sensor measurements.