STMicroelectronics LMV331ILT

Overview

LMV331ILT from STMicroelectronics is a single-channel, low-voltage, open-drain comparator with 2.7–5 V supply operation, 20 µA quiescent current, and 200 ns propagation delay (at 100 mV overdrive). It features rail-to-rail input common-mode range including ground, −40°C to +125°C operating temperature, and 2 kV HBM ESD tolerance. It is used in battery-powered voltage monitoring circuits where space and power efficiency are critical.

For engineers reviewing the LMV331ILT datasheet, LMV331ILT pinout, LMV331ILT application, or LMV331ILT equivalent, key selection considerations include its SOT23-5 package footprint, open-drain output compatibility with I²C bus pull-up schemes, low-input-offset drift (5 µV/°C), and guaranteed performance across automotive-grade temperature extremes.

Technical Context

The LMV331ILT implements a CMOS input stage with bipolar output transistor, enabling ground-sensing capability while maintaining low input bias current (25–400 nA) and low offset voltage (1–9 mV). Its open-drain output requires an external pull-up resistor and supports wired-OR logic and level translation across voltage domains.

It operates as a threshold-detection element in analog-to-digital signal conditioning paths - comparing a sensed voltage against a reference and asserting a digital flag. Propagation delay remains stable across 2.7–5 V supply and full temperature range, with worst-case TPHL/TPLH of 375 ns / 550 ns at 10 mV overdrive.

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact 2.9 × 2.8 × 1.3 mm surface-mount outline with exposed pad option (not thermally enhanced per datasheet); suitable for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage comparator applications.

Compared with TLV331IDBVR and NCS2200SQ2T2G, the LMV331ILT uniquely combines automotive-grade temperature range, open-drain versatility, and sub-200 ns speed at 20 µA - making it optimal for safety-critical, multi-voltage, and battery-constrained designs.

Availability

LMV331ILT is available at Aetrix Electronics and suitable for battery management systems, automotive body electronics, and portable medical devices requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LMV331ILT 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, designing and manufacturing microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer markets.

The LMV3xx series was developed specifically for low-voltage, low-power portable and automotive applications - prioritizing ground-sensing capability, wide temperature operation, and minimal board footprint without sacrificing speed or robustness.

FAQ

Can LMV331ILT operate with a 1.8 V supply?

No. The absolute maximum rating specifies minimum supply voltage of 2.7 V, and electrical characteristics are only guaranteed from 2.7 V to 5.0 V. Operation below 2.7 V may result in undefined output behavior, increased propagation delay, or failure to meet input common-mode range specifications.

Is an external pull-up resistor required on the OUT pin?

Yes. The LMV331ILT has an open-drain output and cannot source current. A pull-up resistor (typically 4.7 kΩ to 10 kΩ) must connect OUT to a defined logic-high voltage (e.g., 3.3 V or 5 V) to generate a valid HIGH signal. Without it, the output remains floating and indeterminate.

Does LMV331ILT include built-in hysteresis?

No. The device has no internal hysteresis. External positive feedback (e.g., resistor from OUT to IN+) must be added to implement noise-immune threshold switching. Typical hysteresis values range from 5 mV to 50 mV depending on resistor ratio and supply voltage.

What is the maximum sink current the OUT pin can handle continuously?

The datasheet specifies 47 mA maximum sink current at 25°C with VCC = 5 V and VOUT < 1.5 V. For continuous operation, thermal limits apply: junction temperature must remain ≤150°C. At 125°C ambient, sustained 47 mA requires careful PCB copper area design and is typically limited to pulsed or intermittent loads in practice.