Texas Instruments LM393LVDGKR

Overview

LM393LVDGKR from Texas Instruments is a dual low-voltage rail-to-rail input comparator with open-drain outputs, operating from 1.65 V to 5.5 V supply. It delivers 400 µV typical input offset voltage, 600 ns typical propagation delay, and 25 µA per channel quiescent current across –40°C to +125°C, enabling precision threshold detection in space-constrained industrial power supplies.

For engineers reviewing the LM393LVDGKR datasheet, LM393LVDGKR pinout, LM393LVDGKR application, or LM393LVDGKR equivalent, this page provides verified package mapping (VSSOP-8), confirmed rail-to-rail input operation up to 6 V, Power-On-Reset behavior, and validated alternatives for low-voltage comparator replacement in server PSU and motor drive designs.

Technical Context

The LM393LVDGKR implements two independent comparators with internal Power-On-Reset circuitry that forces outputs into high-impedance state until supply reaches minimum operating voltage, eliminating output transients during power-up/down. Its rail-to-rail input stage accepts common-mode voltages from GND to V+, with no phase inversion or damage up to 6 V.

Each comparator features ultra-low input bias current (5 pA typical) and low input offset drift (±1.5 µV/°C), supporting stable operation in high-impedance sensor interfaces. The open-drain outputs require external pull-up and support wired-OR logic, level translation, and direct interfacing with microcontrollers or FPGAs.

Key Specifications

Pinout & Package

LM393LVDGKR is packaged in an 8-pin VSSOP (DGK) with body size 3.00 mm × 3.00 mm and exposed thermal pad connected directly to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL393LVDR and LM393QDRQ1, LM393LVDGKR provides identical comparator performance in the smallest industry-standard package (VSSOP-8), making it optimal for space-constrained industrial and consumer electronics where automotive qualification is unnecessary.

Availability

LM393LVDGKR is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive fault detection, and cordless power tool battery management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM393LVDGKR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LM393LV family was designed specifically to replace legacy LM393 comparators in ≤5 V systems, adding rail-to-rail inputs, Power-On-Reset, and extended temperature capability while maintaining pin compatibility with select packages.

FAQ

What is the maximum input voltage allowed on LM393LVDGKR pins relative to GND?

The LM393LVDGKR supports input voltages from –0.3 V to 6 V relative to GND, regardless of supply voltage. This rail-to-rail input capability with overvoltage tolerance up to 6 V eliminates external clamping diodes in applications such as battery voltage monitoring where inputs may exceed V+. The absolute maximum rating ensures no phase inversion or damage occurs within this range, as confirmed in Section 5.1 of the SNOSDA4D datasheet.

Does LM393LVDGKR have built-in Power-On-Reset functionality?

Yes, LM393LVDGKR includes integrated Power-On-Reset (POR) circuitry that holds both outputs in a high-impedance state until the supply voltage reaches the minimum operating threshold (1.65 V). This prevents output transients during power-up and power-down sequences, ensuring reliable system initialization in server PSUs and motor drives. The POR behavior is explicitly documented in Section 3 and Figure 6-1 of the SNOSDA4D datasheet.

Can LM393LVDGKR operate from a 1.8 V supply?

Yes, LM393LVDGKR is fully specified to operate from 1.65 V to 5.5 V, including 1.8 V nominal supplies. At 1.8 V, it maintains 400 µV typical input offset voltage, 600 ns typical propagation delay, and 25 µA per channel quiescent current across –40°C to +125°C. These parameters are validated in Tables 5.9 and 5.10 of the SNOSDA4D datasheet under VS = 1.8 V test conditions.

What is the recommended layout practice for the exposed thermal pad on LM393LVDGKR?

The exposed thermal pad on the VSSOP-8 package of LM393LVDGKR must be soldered directly to the PCB's GND plane using a solid copper fill and multiple thermal vias. This connection serves both thermal dissipation and electrical grounding functions. TI's layout guidelines in Section 7.4 of SNOSDA4D specify that failure to connect the pad to GND degrades thermal resistance by >50% and risks output instability due to floating substrate potential.

Is LM393LVDGKR pin-compatible with standard LM393 comparators?

No, LM393LVDGKR is not pin-compatible with legacy LM393 variants. While both are dual comparators in 8-pin packages, LM393LVDGKR uses the VSSOP-8 (DGK) pinout defined in Figure 4-3 of SNOSDA4D: OUT1, IN1–, IN1+, GND, IN2+, IN2–, OUT2, V+. Standard LM393 SOIC-8 uses OUT1, IN1–, IN1+, VCC, IN2–, IN2+, OUT2, GND. Direct substitution requires PCB redesign to accommodate the reversed input and power pin assignments.