Texas Instruments LMP2231AMAX/NOPB

Overview

LMP2231AMAX/NOPB from Texas Instruments is a single micropower precision operational amplifier with CMOS inputs, designed for ultra-low-power sensor interface and instrumentation applications. It delivers 10 µA supply current, ±150 µV max input offset voltage, ±0.4 µV/°C max offset drift (LMP2231A grade), rail-to-rail output swing within 15 mV of rails, and operates from 1.6V to 5.5V - enabling high-accuracy signal conditioning in battery-powered medical devices and strain gauge bridges.

For engineers reviewing the LMP2231AMAX/NOPB datasheet, LMP2231AMAX/NOPB pinout, LMP2231AMAX/NOPB application, or LMP2231AMAX/NOPB equivalent, key selection criteria include guaranteed low TCVOS (±0.4 µV/°C max), femtoampere-level input bias current (±20 fA), 120 dB PSRR/CMRR, 130 kHz gain-bandwidth product, and operation down to 1.6V supply - all validated across –40°C to 125°C.

Technical Context

The LMP2231AMAX/NOPB employs a CMOS input stage enabling ultra-low input bias current (20 fA typical) and high input impedance (>10¹³ Ω), critical for interfacing high-impedance sensors like thermocouples and piezoresistive elements. Its precision architecture includes laser-trimmed input offset and drift compensation, ensuring stable DC accuracy over temperature and supply variation.

It features rail-to-rail output with 15 mV headroom at 5V, common-mode input range extending 200 mV below V–, and unity-gain stability with capacitive loads up to 100 pF. The device maintains 120 dB open-loop gain and 120 dB PSRR across its full 1.6V–5.5V supply range, supporting robust performance in single-supply, ground-sensing configurations.

Key Specifications

Pinout & Package

Package: 5-Pin SOT-23 (DBV0005A). Compact footprint (2.9 mm × 1.6 mm) suitable for space-constrained wearable and implantable medical designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op-amp applications.

Compared with OPA333AIDBVR and MAX44260AUT+T, the LMP2231AMAX/NOPB uniquely balances ultra-low power (10 µA), precision (±150 µV VOS), and femtoampere input bias - making it optimal for always-on, battery-constrained sensing where both accuracy and longevity are non-negotiable.

Availability

LMP2231AMAX/NOPB is available at Aetrix Electronics and suitable for precision instrumentation amplifiers, battery powered medical instrumentation, high impedance sensors, strain gauge bridge amplifiers, and thermocouple amplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMP2231AMAX/NOPB 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain solutions.

The LMP™ precision amplifier family, including the LMP2231AMAX/NOPB, was engineered specifically for ultra-low-power, high-accuracy sensor interface applications in portable and industrial systems where battery life and DC stability are critical.

FAQ

What is the maximum guaranteed input offset voltage for LMP2231AMAX/NOPB?

The LMP2231AMAX/NOPB has a maximum input offset voltage of ±150 µV across temperature and supply conditions, as specified in the TI SNOSB01E datasheet. This value is guaranteed for the "A" grade variant and applies over the full –40°C to 125°C operating range. The LMP2231AMAX/NOPB achieves this via laser trimming during wafer sort, ensuring consistent performance without post-assembly calibration.

Does LMP2231AMAX/NOPB support rail-to-rail input common-mode range?

No, the LMP2231AMAX/NOPB does not support rail-to-rail input. Its common-mode input voltage range extends 200 mV below the negative supply (V–) but only up to V+ − 1.2 V. For example, at 5V supply, the valid input range is –0.2 V to +3.8 V. This limitation is inherent to its CMOS input stage design and is explicitly defined in the Electrical Characteristics tables of the LMP2231AMAX/NOPB datasheet.

Can LMP2231AMAX/NOPB operate from a 1.6V supply?

Yes, the LMP2231AMAX/NOPB is fully specified to operate from 1.6V to 5.5V supply voltage. At 1.6V, it maintains 10 µA typical supply current, ±230 µV max input offset voltage, and functional rail-to-rail output swing. All key parameters-including PSRR, CMRR, and gain-bandwidth-are characterized down to 1.6V, making the LMP2231AMAX/NOPB suitable for direct integration with emerging low-voltage energy harvesting systems.

What package type is used for LMP2231AMAX/NOPB?

The LMP2231AMAX/NOPB is supplied in a 5-pin SOT-23 package (TI package code DBV0005A), measuring 2.9 mm × 1.6 mm × 1.0 mm. This surface-mount package features gull-wing leads, is RoHS-compliant and lead-free (NOPB suffix), and is optimized for automated assembly in high-density PCB layouts typical of portable medical and industrial sensor modules.

How does the input bias current of LMP2231AMAX/NOPB compare to bipolar-input op-amps?

The LMP2231AMAX/NOPB specifies a maximum input bias current of ±20 fA - over six orders of magnitude lower than typical bipolar-input op-amps (e.g., LM358: ~45 nA). This femtoampere-level bias enables accurate amplification of signals from ultra-high-impedance sources such as glass pH electrodes, piezoelectric sensors, and photodiode arrays without introducing significant input error voltage or drift. The LMP2231AMAX/NOPB achieves this via its CMOS input architecture.