Texas Instruments INA2141UA

Overview

INA2141UA 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 supply range - used in precision sensor signal conditioning for thermocouples and bridge transducers.

For engineers reviewing the INA2141UA datasheet, INA2141UA pinout, INA2141UA application, or INA2141UA equivalent, key selection criteria include guaranteed dual-channel independence, ±40 V input overvoltage protection, 200 kHz bandwidth at G = 100, and SOIC-16 surface-mount packaging for space-constrained industrial measurement systems.

Technical Context

The INA2141UA implements a 3-op-amp current-feedback architecture enabling wide bandwidth (200 kHz at G = 100) without sacrificing DC precision. Its dual channels operate fully independently - no shared bias circuitry - ensuring negligible crosstalk even at high frequencies.

Gain is set by internal laser-trimmed resistor networks (40 kΩ/252 Ω ratio), supporting only two factory-configured options: G = 10 (open jumper) or G = 100 (shorted jumper). Input overvoltage protection clamps to ±40 V regardless of power supply state, and reference pins (RefA/RefB) must be low-impedance grounded to maintain >110 dB CMR.

Key Specifications

Pinout & Package

INA2141UA is housed in a 16-pin SOIC (DW package drawing), 7.5 mm × 10.3 mm body, RoHS-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 INA2141UA, INA2128U trades guaranteed low-drift fixed gain for programmability and higher noise, while AD8222ARZ offers superior CMR scalability but demands external protection and doubles component count for dual-channel operation.

Availability

INA2141UA is available at Aetrix Electronics and suitable for industrial sensor interfaces, medical biopotential acquisition, and multi-channel data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA2141UA 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 signal chain components for industrial and medical applications.

The INA2141 series was designed specifically for dual-channel, low-drift, overvoltage-hardened sensor signal conditioning - targeting applications where channel independence, input robustness, and DC precision outweigh programmability needs.

FAQ

What gain options does the INA2141UA support, and how are they configured?

The INA2141UA supports only two factory-set gains: G = 10 V/V (jumper open) or G = 100 V/V (jumper shorted) on each channel independently. Configuration is done externally via solder jumpers between Pins 13–14 (Channel A) and Pins 15–16 (Channel B). Internal laser-trimmed resistors ensure ±0.05% gain accuracy at G = 100 - no external resistors are used or recommended. The INA2141UA datasheet specifies that external gain-setting resistors introduce uncertainty due to ±25% internal resistor tolerance.

Does the INA2141UA require external input protection when interfacing with industrial sensors?

No, the INA2141UA does not require external input protection. Its inputs are individually rated for ±40 V continuous overvoltage - including operation with supplies disconnected - and limit input current to 1.5–5 mA during overload. This integrated protection eliminates the need for external TVS diodes or series resistors in typical bridge, thermocouple, or RTD applications. The INA2141UA's protection circuitry is validated across the full –40°C to +85°C temperature range and remains active regardless of supply state.

How does the dual-channel architecture of the INA2141UA prevent crosstalk between channels?

The INA2141UA uses fully independent circuitry for each channel - including separate input stages, amplifiers, bias networks, and reference paths - resulting in negligible crosstalk (< –120 dB at 1 kHz). Unlike multiplexed or shared-core architectures, this physical isolation prevents signal coupling through power rails or substrate. Layout best practices (e.g., guard traces, separated input routing) further reduce capacitive coupling, making the INA2141UA suitable for simultaneous high-precision acquisition of unrelated sensor signals - a capability confirmed in the INA2141UA datasheet's crosstalk vs. frequency curves.

Can the INA2141UA operate from a single 5 V supply, and what are the input/output voltage limitations?

Yes, the INA2141UA can operate from a single 5 V supply configured as ±2.5 V (V+ = +2.5 V, V– = –2.5 V). In this configuration, the linear input common-mode range is reduced to approximately (V+) – 1.4 V to (V–) + 1.7 V - i.e., +1.1 V to –0.8 V - and output swing is limited to (V+) – 0.9 V to (V–) + 0.9 V. These constraints are detailed in the INA2141UA's "Input Common-Mode Range vs Output Voltage" typical curves for ±2.5 V supplies. Operation at minimum ±2.25 V rails is supported but requires careful attention to input headroom.

What is the purpose of the SenseA and SenseB pins on the INA2141UA, and are they mandatory?

SenseA (Pin 5) and SenseB (Pin 10) are dedicated output sense terminals required for stable closed-loop operation of the INA2141UA. They must be connected directly to their respective output pins (VOA and VOB) unless remote Kelvin sensing is implemented - in which case SenseA connects to the load's high-side terminal. Leaving these pins unconnected causes instability and oscillation, as confirmed in the INA2141UA application information section. The internal feedback path relies on this connection to regulate output accurately, especially under varying load conditions or PCB trace impedance.