STMicroelectronics LMV821AICT

Overview

LMV821AICT from STMicroelectronics is a single-channel, rail-to-rail output operational amplifier with shutdown control, designed for precision signal conditioning in low-voltage, power-constrained systems. It delivers 5.5 MHz gain bandwidth, 0.8 mV max input offset voltage at 25°C, 400 µA max supply current at 5 V, and operates across –40°C to +125°C - enabling use in automotive sensor front-ends and portable medical monitors.

For engineers reviewing the LMV821AICT datasheet, LMV821AICT pinout, LMV821AICT application, or LMV821AICT equivalent, key selection criteria include its enhanced offset accuracy (vs. standard LMV821), integrated shutdown function with 50 nA max current, rail-to-rail output swing into 2 kΩ, and qualification for automotive-grade temperature and ESD robustness (4 kV HBM).

Technical Context

The LMV821AICT implements a CMOS input stage with rail-to-rail output stage, supporting operation from 2.5 V to 5.5 V supply. Its input common-mode range extends from V_CC– – 0.2 V to V_CC+ – 1 V, enabling ground-sensing capability without phase reversal. The device integrates a dedicated SHDN pin that places the amplifier in high-impedance shutdown mode with <50 nA quiescent current at 25°C.

It achieves 1.4 V/µs typical slew rate and 60° phase margin with 40 pF capacitive load, ensuring stable unity-gain follower operation. Input offset voltage drift is specified at 1 µV/°C over –40°C to +125°C, supporting high-accuracy DC-coupled amplification in thermally varying environments.

Key Specifications

Pinout & Package

LMV821AICT is supplied in SC70-5 (SOT323-5) package - a 1.25 mm × 1.65 mm, 0.65 mm pitch surface-mount outline optimized for space-constrained PCBs in wearables and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV821ICT, LMV821AICT provides 4.4× lower offset error critical for uncalibrated medical sensors; versus TSV851ICT, it trades 220 µA higher quiescent current for 4.2× higher bandwidth and integrated shutdown - making it optimal for automotive and portable diagnostic signal chains requiring both precision and responsiveness.

Availability

LMV821AICT is available at Aetrix Electronics and suitable for automotive signal conditioning, portable medical instrumentation, and battery-powered industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMV821AICT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 validation capabilities.

The LMV82x series belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-voltage signal conditioning in harsh-environment applications - including automotive cabin sensors, portable diagnostics, and industrial process monitoring.

FAQ

What is the maximum capacitive load the LMV821AICT can drive while maintaining stability?

The LMV821AICT is stable with up to 200 pF capacitive load in unity-gain follower configuration, as verified by phase margin ≥45° across –40°C to +125°C (Figure 13). For loads >100 pF, ST recommends adding a 10 Ω series resistor between output and capacitor to isolate reactive feedback and preserve 60° phase margin.

Can the SHDN pin be driven directly by a 1.8 V GPIO without level translation?

No. The SHDN pin requires VIH ≥ V_CC– + 0.5 V to enable the amplifier. With V_CC = 3.3 V, VIH must be ≥2.8 V - so a 1.8 V GPIO cannot reliably assert high. A pull-up to V_CC with open-drain GPIO or a single-transistor level shifter is required for 1.8 V control interfaces.

How does the input common-mode range affect operation with single-supply 3.3 V sensors?

The input common-mode range extends to V_CC– – 0.2 V (i.e., –0.2 V below ground), allowing direct connection of grounded-referenced sensors (e.g., thermocouples, bridge transducers) without AC coupling or bias resistors - preserving DC accuracy and simplifying PCB layout in 3.3 V systems.

Is the LMV821AICT pin-compatible with legacy LMV321 designs?

No. While both are SC70-5 op-amps, LMV321 has IN+, IN–, V–, OUT, V+ pinout; LMV821AICT uses IN–, IN+, V–, SHDN, OUT. Direct replacement requires PCB redesign. However, the LMV821AICT's superior GBP (5.5 MHz vs. 1 MHz) and lower V_IO justify layout revision for performance-critical upgrades.