Texas Instruments LMV331M5X/NOPB

Overview

LMV331M5X/NOPB from Texas Instruments is a single, low-voltage, rail-to-rail input comparator with open-collector output, designed for space-constrained portable systems. It operates from 2.7 V to 5 V, draws only 60 µA typical supply current per channel, features 200 mV typical output saturation voltage at 4 mA sink, and delivers 200 ns propagation delay (5-V supply, 100-mV overdrive). It is widely used in battery-powered voltage monitoring and level detection circuits.

For engineers reviewing the LMV331M5X/NOPB datasheet, LMV331M5X/NOPB pinout, LMV331M5X/NOPB application, or LMV331M5X/NOPB equivalent, key selection considerations include its ground-sensing input range (−0.1 V to 4.2 V at 5 V), open-collector output compatibility with CMOS/TTL logic, industrial temperature rating (−40°C to +85°C), and SC70-5/SOT-23-5 package footprint constraints.

Technical Context

The LMV331M5X/NOPB implements a bipolar-input, BiCMOS-output architecture optimized for low-voltage operation and noise immunity. Its input stage supports common-mode voltages down to −0.1 V (below ground) and up to 0.8 V below V+, enabling true ground-referenced sensing without level-shifting circuitry.

It uses an uncommitted NPN output transistor requiring an external pull-up resistor (1 kΩ–10 kΩ) to enable wired-OR configurations, window comparators, and direct interfacing with mixed-voltage logic families. Propagation delay is load-dependent and specified with 5.1 kΩ pull-up and defined input overdrive conditions.

Key Specifications

Pinout & Package

LMV331M5X/NOPB is housed in a 5-pin SC70 package (2.00 mm × 1.25 mm body size), offering ~50% area reduction versus SOT-23-5. The SC70 footprint supports high-density PCB layouts in wearables and compact IoT sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV331IDBVR and MAX9021AXK+T, LMV331M5X/NOPB offers the best balance of ultra-low supply current, ground-referenced input capability, and minimal footprint-making it optimal for battery-critical, space-constrained applications where precision is secondary to power and size.

Availability

LMV331M5X/NOPB is available at Aetrix Electronics and suitable for battery voltage monitoring, power-good detection, oscillator timing circuits, and overvoltage protection applications requiring stable component supply across production lifecycles.

Supply support for LMV331M5X/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 and low-power IC design.

The LMV331M5X/NOPB belongs to TI's general-purpose low-voltage comparator family, engineered specifically for cost-sensitive, space-constrained portable electronics where supply current, ground-sensing capability, and small-outline packaging are critical.

FAQ

What is the maximum operating supply voltage for LMV331M5X/NOPB?

The absolute maximum supply voltage for LMV331M5X/NOPB is 5.5 V, but the recommended operating range is 2.7 V to 5 V. Operation above 5 V risks permanent damage per the Absolute Maximum Ratings table in the SNOS018H datasheet. At 5 V, LMV331M5X/NOPB delivers optimal propagation delay (200 ns) and output sink capability (up to 10 mA), while maintaining 60 µA typical supply current.

Does LMV331M5X/NOPB support rail-to-rail input operation?

LMV331M5X/NOPB supports rail-to-rail *input common-mode range* down to −0.1 V below ground and up to 4.2 V at 5 V supply - often described as "ground-sensing" rather than full rail-to-rail. Its input stage does not operate at the positive rail (V+), limiting the upper bound to ~0.8 V below V+. This design enables true ground-referenced sensing without external level shifters, a key feature confirmed in Section 7.3.2 of the LMV331-N datasheet.

Can LMV331M5X/NOPB drive a 3.3 V logic input directly?

Yes, LMV331M5X/NOPB can drive a 3.3 V logic input using an external pull-up resistor to 3.3 V. Its open-collector output is rated for V+ up to 5 V, so pulling up to 3.3 V is within specification. With a 10 kΩ pull-up, the output saturates to ≤200 mV (at 4 mA sink), ensuring a valid logic LOW; the HIGH level equals the pull-up voltage (3.3 V), compatible with standard 3.3 V CMOS inputs. This configuration is explicitly validated in Section 8.1.4 of the SNOS018H datasheet.

What is the purpose of the open-collector output in LMV331M5X/NOPB?

The open-collector output in LMV331M5X/NOPB enables wired-OR logic, level translation, and flexible interfacing with mixed-voltage systems. Because the output transistor sinks current only, multiple LMV331M5X/NOPB outputs (or other open-collector devices) can share a single pull-up resistor to create a logical OR function - essential for window comparators and fault-bus architectures. TI specifies a 1 kΩ–10 kΩ pull-up range in Section 7.3.1 to balance speed, power, and drive strength without overstressing the output transistor.

Is LMV331M5X/NOPB suitable for automotive applications?

LMV331M5X/NOPB is qualified for the industrial temperature range (−40°C to +85°C) and carries no AEC-Q200 qualification. While it functions reliably within that range and is used in non-safety-critical automotive cabin modules (e.g., infotainment power sequencing), it is not approved for under-hood or ASIL-B/C applications. For automotive-grade alternatives, TI recommends the TLV3701-Q1 (AEC-Q100 qualified), which shares functional similarity but adds automotive-specific testing and traceability - a distinction clearly documented in TI's automotive comparator portfolio guides.