Texas Instruments LM393PWG4

Overview

LM393PWG4 from Texas Instruments is a dual precision voltage comparator in TSSOP-8 package, designed for single-supply operation from 2 V to 36 V. It delivers ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, 1 µs propagation delay, rail-to-rail input common-mode range including ground, and open-collector outputs compatible with TTL/MOS/CMOS logic-used in server PSU overvoltage detection and motor drive enable monitoring.

For engineers reviewing the LM393PWG4 datasheet, LM393PWG4 pinout, LM393PWG4 application, or LM393PWG4 equivalent, key selection criteria include its B-version enhanced ESD rating (2 kV HBM), extended supply voltage headroom (36 V max), low-input-bias-current design (3.5 nA typ), thermal performance in TSSOP (R_θJA = 200.6°C/W), and drop-in compatibility with legacy LM393/LM293 footprints.

Technical Context

The LM393PWG4 implements two independent comparators with dedicated ESD clamps enabling 2 kV HBM robustness and improved input ruggedness. Its input stage supports common-mode voltages down to ground and up to V_CC − 2 V, while differential input range extends to ±38 V-enabling direct sensing of high-side signals without level-shifting.

Output stage uses open-collector NPN transistors with 25 mA sink capability and low saturation voltage (400 mV at 4 mA), allowing flexible pull-up configuration across logic families. Propagation delay remains stable across temperature (−40°C to +85°C) and supply voltage (2–36 V), with response time optimized for fast edge detection in power sequencing and fault monitoring.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package: 3.00 mm × 4.40 mm body, 0.65 mm pitch, exposed pad not present - suitable for compact PCB layouts with moderate thermal dissipation requirements (R_θJA = 200.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393PWR, LM393PWG4 offers identical performance but differs only in tape-and-reel packaging specification; versus LM2903PWG4, it trades 40°C lower max ambient for tighter offset voltage consistency in commercial-grade applications.

Availability

LM393PWG4 is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive enable control, vacuum robot safety interlocks, and wireless infrastructure power sequencing requiring stable component supply across multi-year production cycles.

Supply support for LM393PWG4 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 communications markets.

The LM393B family was engineered to replace legacy dual comparators with enhanced precision, ESD robustness, and supply voltage headroom - targeting power management, safety-critical monitoring, and sensor interface applications.

FAQ

What is the maximum supply voltage rating for LM393PWG4?

The LM393PWG4 supports a maximum supply voltage of 36 V, consistent with the LM393B series' enhanced absolute maximum rating. This exceeds legacy LM393 (30 V) and enables direct use in 24 V and 36 V industrial control rails without derating. Operation at 36 V is validated across the full −40°C to +85°C ambient range with no parameter degradation.

Does LM393PWG4 require a negative supply rail?

No, LM393PWG4 operates from a single positive supply rail (2 V to 36 V) with inputs referenced to ground. Its rail-to-rail input common-mode range includes ground, allowing direct connection of low-side current-sense resistors or grounded thermistors without level-shifting circuitry. The output stage is open-collector, requiring only a pull-up resistor to V_CC or another logic rail.

How does the input offset voltage of LM393PWG4 compare to older LM393 variants?

LM393PWG4 (B-version) specifies ±0.37 mV typical input offset voltage, significantly lower than standard LM393 (±9 mV max) and LM393A (±4 mV max). This 10× improvement enables precise threshold detection in low-voltage applications such as battery voltage monitoring or photodiode signal conditioning, where offset-induced errors would otherwise dominate measurement accuracy.

Can LM393PWG4 replace LM393DR in an existing SOIC-8 design?

LM393PWG4 is not pin-compatible with SOIC-8 LM393DR due to different package geometry (TSSOP-8 vs SOIC-8), though both share identical pin numbering and function mapping. A PCB redesign is required to accommodate the smaller 3.00 mm × 4.40 mm TSSOP footprint and 0.65 mm pitch. For drop-in replacement, LM393DRG4 (SOIC-8) or LM393PWR (TSSOP-8) should be selected instead.

What is the thermal resistance of LM393PWG4 in its TSSOP-8 package?

LM393PWG4 in TSSOP-8 (PW) package has a junction-to-ambient thermal resistance (R_θJA) of 200.6°C/W under standard JEDEC test conditions. This value assumes no copper pour or thermal vias; adding a 1-inch² 2-oz copper plane with 4 thermal vias reduces effective R_θJA to approximately 65°C/W, enabling continuous operation at full load up to +85°C ambient.