Texas Instruments LM393DGKR

Overview

LM393DGKR from Texas Instruments is a dual precision voltage comparator in VSSOP-8 package, featuring 0.37 mV typical input offset voltage, 200 µA per comparator supply current, 1 µs propagation delay, rail-to-rail input common-mode range including ground, and ±38 V differential input capability. It operates from 2 V to 36 V single supply and is used in overvoltage protection circuits within server PSUs and motor drive control stages.

For engineers reviewing the LM393DGKR datasheet, LM393DGKR pinout, LM393DGKR application, or LM393DGKR equivalent, key selection considerations include its B-version enhanced ESD rating (2 kV HBM), low-input-bias-current design (3.5 nA typ), open-collector output compatibility with TTL/MOS/CMOS, and qualification for industrial temperature range (–40°C to +85°C).

Technical Context

The LM393DGKR implements two independent comparators with internal ESD clamps enabling robust 2 kV HBM tolerance. Its input stage supports common-mode voltages down to ground and up to VCC – 2 V, while differential inputs tolerate ±38 V - exceeding legacy LM393 limits. The output stage uses open-collector NPN transistors capable of sinking up to 21 mA at 5 V supply.

Quiescent current remains stable across 2 V–36 V supply range and is temperature-invariant (400–600 µA total). Propagation delay is specified at 1 µs for small-signal steps (100 mV with 5 mV overdrive) and 300 ns for TTL-level transitions, confirming high-speed response without requiring external hysteresis in many applications.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm lead pitch, exposed thermal pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and LM2903DGKR, the LM393DGKR delivers optimal thermal performance in compact layouts while maintaining industrial-grade reliability - making it preferred for high-density server PSU and cordless tool designs where size and 85°C operation are primary constraints.

Availability

LM393DGKR is available at Aetrix Electronics and suitable for server power supplies, cordless power tools, and wireless infrastructure equipment requiring stable component supply and long-term industrial lifecycle support.

Supply support for LM393DGKR 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 experience in precision analog ICs and industrial-grade components.

The LM393B family - including LM393DGKR - was designed to upgrade legacy LM393 comparators with tighter offset, lower power, faster response, and enhanced ruggedness for modern industrial and computing power systems.

FAQ

What is the maximum supply voltage supported by LM393DGKR?

The LM393DGKR supports a maximum supply voltage of 36 V, as confirmed in the Absolute Maximum Ratings table. This exceeds the 30 V limit of non-B versions and enables direct integration into 24 V industrial control rails and 36 V battery systems without external regulation. Operation at 36 V is validated across the full –40°C to +85°C temperature range.

Does LM393DGKR require a negative supply rail?

No, the LM393DGKR operates from a single positive supply (2 V to 36 V) with inputs referenced to ground. Its common-mode input range includes ground and extends up to VCC – 2 V, eliminating need for dual supplies. This simplifies power architecture in applications like appliance controllers and UPS monitoring where only +5 V or +12 V rails are available.

Can LM393DGKR drive a 5 V logic input directly?

Yes - the LM393DGKR features open-collector outputs compatible with TTL, MOS, and CMOS logic families. When paired with a 5 V pull-up resistor (e.g., 10 kΩ), its output sinks current to produce a valid logic-low (<0.4 V at 4 mA), and floats to 5 V for logic-high. No level-shifting circuitry is needed for interfacing with standard microcontrollers or FPGAs.

Is LM393DGKR pin-compatible with older LM393 variants?

Yes, the LM393DGKR is a drop-in replacement for LM293, LM393, and LM2903 in VSSOP-8 (DGK) package. Pin functions match exactly: 1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, VCC. Electrical improvements (lower offset, faster response, higher ESD) do not alter pin behavior or layout requirements.

What is the thermal pad connection requirement for LM393DGKR?

The exposed thermal pad on the underside of the LM393DGKR (VSSOP-8) must be connected directly to the GND net using multiple thermal vias. Per TI's DSG/DGK package guidelines, this connection reduces junction-to-board thermal resistance to 63.1°C/W and prevents thermal runaway during sustained 21 mA output sinking. Failure to connect the pad degrades reliability and may cause parametric drift above 60°C ambient.