Texas Instruments LM393LVDDFR

Overview

LM393LVDDFR 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, featuring 400 µV typical input offset voltage, 600 ns typical propagation delay, and full –40°C to +125°C temperature range. It serves as a drop-in replacement for legacy LM393 in ≤5 V systems, used in server PSUs and motor drives for precise voltage monitoring and threshold detection.

For engineers reviewing the LM393LVDDFR datasheet, LM393LVDDFR pinout, LM393LVDDFR application, or LM393LVDDFR equivalent, key selection criteria include its rail-to-rail input capability up to 6 V without damage, Power-On-Reset (POR) ensuring known startup state, and ultra-low 25 µA/ch quiescent current enabling battery-sensitive designs.

Technical Context

The LM393LVDDFR integrates two independent comparators with internal POR circuitry that holds outputs in high-impedance until V+ reaches minimum operating voltage, preventing transients during power-up/down. Its rail-to-rail input stage accepts common-mode voltages from GND to V+, including overvoltage tolerance up to 6 V.

Each comparator features picoamp-level input bias current (5 pA typical), 60–65 dB CMRR at 5 V, and open-drain output capable of sinking 4 mA with ≤300 mV VOL across –40°C to +125°C - enabling flexible level-shifting and wired-OR logic configurations.

Key Specifications

Pinout & Package

LM393LVDDFR is packaged in an 8-pin SOIC (D) with body size 3.91 mm × 4.90 mm, lead pitch 1.27 mm, and exposed pad not present. Pin 1 is OUT1; pin 4 is GND; pin 8 is V+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL393LVDR, LM393LVDDFR offers identical functionality in smaller reel quantity; versus LM393QDR, it delivers superior precision, lower power, and failsafe input behavior essential for modern 1.8 V–5 V embedded systems.

Availability

LM393LVDDFR is available at Aetrix Electronics and suitable for server PSU, motor drive, and vacuum robot applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LM393LVDDFR 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The LM393LV family was designed specifically to upgrade legacy comparator applications operating at ≤5 V, adding rail-to-rail input, POR, and ultra-low power while maintaining pin compatibility with industry-standard SOIC-8 footprints.

FAQ

What is the maximum input voltage allowed on the IN+ and IN– pins of LM393LVDDFR?

The LM393LVDDFR supports rail-to-rail input with failsafe: inputs tolerate voltages from GND to V+ under normal operation, and up to 6 V absolute maximum without damage or phase inversion. This eliminates external clamping diodes in systems where sensor outputs may exceed V+, such as in automotive load-dump scenarios. The LM393LVDDFR datasheet specifies ±0.3 V absolute maximum ratings relative to GND, but the failsafe design permits sustained 6 V input.

Does LM393LVDDFR have built-in Power-On-Reset (POR) functionality?

Yes, LM393LVDDFR includes an integrated Power-On-Reset circuit that holds both outputs in high-impedance state until V+ reaches and stabilizes above 1.65 V. This prevents spurious output transitions during power-up, brown-out, or hot-plug events - a critical feature absent in standard LM393. The POR behavior is confirmed in Section 6.3 of the LM393LVDDFR datasheet and applies across the full –40°C to +125°C temperature range.

Can LM393LVDDFR replace standard LM393 in existing designs without layout changes?

Yes, LM393LVDDFR is pin-compatible with LM393 in SOIC-8 (D) package and maintains identical footprint, pad layout, and pin functions. However, due to its rail-to-rail input and POR features, minor schematic updates may be needed - such as removing external input clamps or adjusting pull-up resistor values to match the lower VOL. Electrical validation is recommended, but PCB redesign is not required for drop-in replacement in ≤5 V systems.

What is the typical quiescent current per channel of LM393LVDDFR at 1.8 V supply?

The LM393LVDDFR draws 25 µA per channel typical at 1.8 V supply and 25°C, rising to 50 µA maximum across –40°C to +125°C. This ultra-low current enables always-on monitoring in battery-powered devices like cordless power tools and vacuum robots. Measured data is provided in Table 5.9 (Electrical Characteristics, LM393LV) of the official TI datasheet SNOSDA4D.

Is LM393LVDDFR qualified for automotive applications?

LM393LVDDFR is not AEC-Q200 qualified, though it operates across –40°C to +125°C and meets industrial reliability standards. For automotive use, TI recommends the pin-compatible LM393QDR (AEC-Q100 Grade 1). LM393LVDDFR is targeted at industrial, computing, and consumer applications including server PSUs, factory automation, and appliances - where its 1.65 V–5.5 V supply range and 5 pA input bias current deliver distinct advantages over automotive-grade alternatives.