Texas Instruments LM393PWR

Overview

LM393PWR from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, 1 µs propagation delay, and rail-to-rail input capability including ground. It serves as a precision threshold detector in power supply monitoring and motor control feedback loops.

For engineers reviewing the LM393PWR datasheet, LM393PWR pinout, LM393PWR application, or LM393PWR equivalent, key selection criteria include input offset drift over temperature (±4 mV max), output sink capability (21 mA), ESD robustness (2 kV HBM), and compatibility with TTL/MOS/CMOS logic interfaces without level-shifting.

Technical Context

The LM393PWR implements two independent open-collector comparators with internal ESD clamps, enabling operation with differential input voltages up to ±38 V and common-mode range extending to VCC – 2 V. Its architecture supports direct interfacing to microcontroller GPIOs via pull-up resistors while maintaining stable performance across –40°C to +85°C.

Each comparator features low input bias current (3.5 nA typ) and high large-signal gain (50–200 V/mV), allowing accurate detection of small analog signals against noisy backgrounds. The device's quiescent current remains constant across supply voltage (2–36 V), simplifying power budgeting in wide-input-range industrial systems.

Key Specifications

Pinout & Package

Packaged in an 8-pin TSSOP (PW) with 3.00 mm × 4.40 mm body size and standard SOIC pinout compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and LM2903PWR, the LM393PWR offers optimal space efficiency in TSSOP-8 for compact consumer electronics while maintaining full drop-in compatibility with legacy LM393 designs-no schematic or firmware changes needed.

Availability

LM393PWR is available at Aetrix Electronics and suitable for power supply monitoring, motor drive protection, and appliance control applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for LM393PWR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LM393x family was engineered as industry-standard dual comparators for cost-sensitive, high-reliability applications demanding wide supply range, ground-sensing capability, and robust ESD performance.

FAQ

What is the maximum supply voltage rating for LM393PWR?

The LM393PWR has an absolute maximum supply voltage rating of 38 V, with recommended operating range from 2 V to 36 V. This allows direct use with 24 V industrial rails and 36 V battery systems while surviving transient spikes up to 38 V without damage. Operation above 36 V is not recommended for continuous use per TI's SLCS005AH datasheet Section 5.1.

Does LM393PWR support rail-to-rail input operation?

Yes, the LM393PWR supports rail-to-rail input common-mode range from ground (V–) to VCC – 2 V. Either or both inputs may reach VCC without damage, and the device correctly resolves comparisons even when one input is at ground and the other at VCC. This enables direct interface with shunt-based current sensors and 0 V–referenced signal chains without external level shifting.

What is the typical propagation delay of LM393PWR at 5 V supply?

The LM393PWR exhibits a typical propagation delay of 1 µs at 5 V supply, measured under conditions of VO_PULLUP = 5 V, CL = 15 pF, RL = 5.1 kΩ, and 100 mV input step with 5 mV overdrive. This value is confirmed in Section 5.7 of the SLCS005AH datasheet and remains stable across –40°C to +85°C operating temperature.

Can LM393PWR replace older LM393 variants without circuit modifications?

Yes, the LM393PWR is a drop-in replacement for LM393, LM293, and LM2903 in TSSOP-8 (PW) and SOIC-8 (D) packages. It maintains identical pinout, electrical behavior, and footprint compatibility. Key improvements-including lower offset voltage (±4 mV vs. ±9 mV), faster response (1 µs vs. 1.3 µs), and 2 kV HBM ESD rating-require no schematic or layout changes.

What output interface standards is LM393PWR compatible with?

The LM393PWR open-collector outputs are compatible with TTL, MOS, and CMOS logic families when used with appropriate pull-up resistors. Its 21 mA sink capability supports direct driving of LEDs, small relays, and standard 5 V or 3.3 V logic inputs. No level-shifting circuitry is required, simplifying interface design in mixed-voltage systems.