Texas Instruments LMV331M5X

Overview

LMV331M5X from Texas Instruments is a single-channel, low-voltage, rail-to-ground input comparator in SOT-23-5 package, featuring 2.7–5 V supply operation, 60 µA typical supply current per channel, 200 ns propagation delay (at 5 V, 100 mV overdrive), and open-collector output compatible with TTL/CMOS logic. It serves as a precision threshold detector in battery-powered portable electronics where space, power, and cost are critical.

For engineers reviewing the LMV331M5X datasheet, LMV331M5X pinout, LMV331M5X application, or LMV331M5X equivalent, key selection considerations include its ground-sensing input range (−0.1 V to 4.2 V at 5 V supply), low 200 mV saturation voltage (ISINK ≤ 4 mA), 7 mV typical input offset voltage, and compatibility with wired-OR configurations via open-collector output.

Technical Context

The LMV331M5X implements a bipolar-input, BiCMOS-output comparator architecture optimized for low-voltage operation. Its input stage supports common-mode voltages down to −0.1 V (enabling ground-referenced sensing), while the open-collector NPN output requires an external pull-up resistor (1–10 kΩ) and enables direct interface with multiple logic families or wired-OR bus topologies.

It operates across −40°C to +85°C and is characterized at both 2.7 V and 5 V supplies - ensuring consistent performance in single-cell Li-ion (3.0–3.6 V), two-cell alkaline (2.7–3.2 V), or regulated 3.3 V/5 V systems. Propagation delay varies with input overdrive (200 ns at 100 mV, 450 ns at 10 mV), supporting both fast edge detection and noise-immune slow-signal monitoring.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV331IDBVR, LMV331M5X trades 5 µA current and 50 ns speed for broader package availability (SOT-23-5) and proven design-in history in portable consumer gear; versus LM393DGKR, it delivers 17× lower supply current and true ground-referenced input - but cannot operate above 5 V.

Availability

LMV331M5X is available at Aetrix Electronics and suitable for battery-powered electronics, mobile communications, and general-purpose portable devices requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LMV331M5X 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, embedded processing, and connectivity technologies, with decades of expertise in precision signal chain components.

The LMV331M5X belongs to TI's LMV33x-N low-voltage comparator family, engineered specifically for space-constrained, battery-operated applications demanding high accuracy, low power, and robust ground-sensing capability.

FAQ

What is the maximum supply voltage for LMV331M5X?

The absolute maximum supply voltage for LMV331M5X is 5.5 V, but the recommended operating range is 2.7 V to 5 V. Operation above 5 V risks permanent damage and violates the device's specified electrical characteristics. At 5 V, LMV331M5X delivers optimal propagation delay (200 ns) and output sink capability (up to 4 mA), making LMV331M5X ideal for standard 3.3 V or 5 V logic interfaces.

Does LMV331M5X support rail-to-rail input?

LMV331M5X does not support full rail-to-rail input - its input common-mode range extends from −0.1 V to 4.2 V at 5 V supply (or −0.1 V to 2.0 V at 2.7 V). This "ground-sensing" capability allows the inverting or non-inverting input to accept signals at or slightly below ground, but the upper limit remains ~0.8 V below V+. So while LMV331M5X accepts inputs down to −0.1 V, it cannot reliably sense signals near V+ without attenuation.

Can LMV331M5X drive a MOSFET gate directly?

No, LMV331M5X cannot drive a MOSFET gate directly due to its open-collector output and limited sink current (max 4 mA at 5 V). It requires an external pull-up resistor to set the HIGH state and lacks source capability entirely. To drive a MOSFET gate, LMV331M5X must interface through a discrete transistor buffer or dedicated gate driver IC - for example, using LMV331M5X's output to control the base of a PNP/NPN pair that switches the gate voltage.

Is LMV331M5X pin-compatible with other SOT-23-5 comparators like TLV331?

LMV331M5X and TLV331IDBVR share identical SOT-23-5 pinout (1:+IN, 2:GND, 3:−IN, 4:OUT, 5:V+), enabling PCB footprint reuse. However, they are not functionally interchangeable without validation: TLV331 offers rail-to-rail input and lower supply current (55 µA), while LMV331M5X provides better noise immunity via bipolar input stage and wider temperature specification (−40°C to +85°C fully characterized). System-level testing is required before substitution.

What pull-up resistor value should I use with LMV331M5X's open-collector output?

Texas Instruments recommends a pull-up resistor between 1 kΩ and 10 kΩ for LMV331M5X. A 4.7 kΩ resistor balances speed (reducing rise time) and power (limiting current to ~1 mA at 5 V), while still allowing safe interfacing with 3.3 V or 5 V logic inputs. Lower values improve switching speed but increase static current; higher values reduce power but risk slow edges or noise susceptibility - especially with capacitive loads exceeding 20 pF. The exact value depends on load capacitance and required rise time in your LMV331M5X application.