Texas Instruments LM393LVDSGR

Overview

LM393LVDSGR from Texas Instruments is a dual low-voltage rail-to-rail input comparator with open-drain outputs, 1.65 V to 5.5 V supply range, 400 µV typical input offset voltage, and 600 ns typical propagation delay. It operates across –40°C to +125°C and serves as an improved replacement for LM393 in ≤5 V systems, commonly used in server PSU and motor drive voltage monitoring circuits.

For engineers reviewing the LM393LVDSGR datasheet, LM393LVDSGR pinout, LM393LVDSGR application, or LM393LVDSGR equivalent, key selection criteria include its rail-to-rail input capability up to 6 V without damage, Power-On-Reset (POR) ensuring high-impedance output during power-up, and 5 pA typical input bias current enabling high-impedance sensing in battery-powered industrial controls.

Technical Context

The LM393LVDSGR implements a dual independent comparator architecture with internal Power-On-Reset circuitry that holds outputs in high-Z state until V+ reaches minimum operating voltage, preventing transients. Its rail-to-rail input stage accepts common-mode voltages from GND to V+ (and up to 6 V absolute), with failsafe operation beyond supply rails.

Each comparator features an open-drain output stage capable of sinking 4 mA at 200 mV drop (25°C), supported by 2 kV HBM ESD protection and full automotive-grade temperature qualification (–40°C to +125°C). The device uses standard CMOS input stages with ultra-low 5 pA bias current and 2–3 pF input capacitance.

Key Specifications

Pinout & Package

LM393LVDSGR is packaged in an 8-pin SOIC (D) with body size 3.91 mm × 4.90 mm, featuring gull-wing leads and standard JEDEC MS-012AC footprint. Thermal pad is not present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL393IP and LM393QDRQ1, LM393LVDSGR delivers lowest power (25 µA/ch), built-in POR, and failsafe rail-to-rail inputs - making it optimal for space- and energy-constrained industrial and computing power management where ≤5 V operation is guaranteed.

Availability

LM393LVDSGR is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive fault detection, and wireless infrastructure power sequencing requiring stable component supply and long-term industrial availability.

Supply support for LM393LVDSGR 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 communications markets.

The LM393LV family was designed specifically to replace legacy LM393 comparators in low-voltage (≤5 V) applications, adding rail-to-rail inputs, Power-On-Reset, and extended temperature operation without changing board layout for SOIC-8 footprints.

FAQ

What is the maximum input voltage allowed on LM393LVDSGR pins?

The LM393LVDSGR permits input voltages from –0.3 V to 6 V relative to GND, independent of supply voltage. This rail-to-rail input with failsafe capability allows direct connection to signals exceeding V+ (e.g., 5.5 V inputs on a 3.3 V-powered LM393LVDSGR), preventing phase inversion or latch-up. Absolute maximum rating is 6 V - sustained operation above V+ should be verified for thermal impact in high-current scenarios.

Does LM393LVDSGR require external pull-up resistors on its outputs?

Yes, LM393LVDSGR features open-drain outputs (OUT1 and OUT2) and requires external pull-up resistors to define the high-state voltage level. Typical values range from 2.2 kΩ to 10 kΩ depending on rise time and bus loading requirements. Pull-up to any voltage ≤6 V is acceptable, including levels different from V+, enabling level translation between domains - for example, pulling up OUT1 to 1.8 V while V+ = 3.3 V.

How does the Power-On-Reset (POR) function work in LM393LVDSGR?

The LM393LVDSGR internal POR circuit monitors V+ and holds both outputs in high-impedance (high-Z) state until V+ rises above 1.65 V and stabilizes. This prevents undefined or glitched output states during power-up, brown-out, or hot-swap events. Once enabled, outputs respond normally to input conditions. POR is fully integrated - no external components or timing adjustments are needed.

Can LM393LVDSGR operate from a 1.8 V supply?

Yes, LM393LVDSGR is fully specified for operation 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. Input common-mode range remains rail-to-rail (0 V to 1.8 V), and output sink capability is characterized down to 150 mV at 4 mA load - making it suitable for ultra-low-voltage IoT sensor nodes.

Is LM393LVDSGR pin-compatible with standard LM393SOIC-8 devices?

No, LM393LVDSGR uses the industry-standard SOIC-8 pinout (D package), matching LM393, LM2903, and TL393. Pin 1 = OUT1, Pin 2 = IN1−, Pin 3 = IN1+, Pin 4 = GND, Pin 5 = IN2+, Pin 6 = IN2−, Pin 7 = OUT2, Pin 8 = V+. This allows drop-in replacement in existing LM393 layouts - however, designers must verify that 1.65–5.5 V supply and open-drain output interface match system requirements.