Texas Instruments LM393LVDR

Overview

LM393LVDR 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 precise threshold detection in server PSUs and motor drive control circuits.

For engineers reviewing the LM393LVDR datasheet, LM393LVDR pinout, LM393LVDR application, or LM393LVDR equivalent, key selection criteria include its rail-to-rail input capability up to 6 V without damage, Power-On-Reset (POR) for known startup state, and compatibility with low-voltage systems requiring high ESD immunity (2 kV HBM) and wide temperature operation.

Technical Context

The LM393LVDR integrates two independent comparators with internal POR circuitry that forces outputs into high-impedance until V+ reaches minimum operating voltage, eliminating power-up transients. Its rail-to-rail input stage accepts common-mode voltages from GND to V+, including overvoltage tolerance up to 6 V.

Each comparator features an open-drain output capable of sinking 4 mA with ≤300 mV VOL at full temperature range, and exhibits 5 pA typical input bias current with 2 pF differential input capacitance-enabling high-impedance sensing in battery-powered and industrial control applications.

Key Specifications

Pinout & Package

LM393LVDR is supplied in an 8-pin SOIC package (3.91 mm × 4.90 mm) with standard surface-mount footprint and gull-wing leads.

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, the LM393LVDR uniquely combines rail-to-rail input operation, 25 µA quiescent current, and integrated POR in a single 8-pin SOIC package-making it the preferred choice for space-constrained, low-voltage, and power-sensitive designs where deterministic startup and precision thresholding are critical.

Availability

LM393LVDR is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive fault detection, and wireless infrastructure power sequencing requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LM393LVDR 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 LM393LVDR belongs to TI's LV comparator family, engineered specifically to replace legacy LM393 devices in ≤5 V systems-delivering improved input range, lower power, and enhanced reliability for modern low-voltage electronics.

FAQ

What is the maximum input voltage allowed on the IN+ and IN– pins of the LM393LVDR?

The LM393LVDR supports rail-to-rail inputs from GND to V+, and its inputs are rated for overvoltage tolerance up to 6 V regardless of supply voltage. This means IN+ and IN– can safely accept up to 6 V even when V+ = 1.8 V, preventing damage or phase inversion during transient events-critical in noisy industrial or automotive environments where the LM393LVDR operates.

Does the LM393LVDR have built-in Power-On-Reset functionality?

Yes, the LM393LVDR includes an integrated Power-On-Reset (POR) circuit that holds both outputs in a high-impedance (high-Z) state until V+ rises above the minimum operating voltage (1.65 V). This ensures no spurious output transitions occur during power-up or brown-out conditions, making the LM393LVDR especially valuable in server PSUs and motor controllers where deterministic startup behavior is essential.

Can the LM393LVDR drive a 5 V microcontroller interrupt pin directly?

Yes, the LM393LVDR's open-drain outputs can interface directly with 5 V microcontrollers when used with an external pull-up resistor to 5 V. Since the output stage is not internally clamped, it safely sinks current while presenting a valid logic-low level (<300 mV) and floats to 5 V when inactive-enabling mixed-voltage system integration without level translators, as confirmed in LM393LVDR application schematics for wireless infrastructure designs.

What is the typical quiescent current per channel of the LM393LVDR at 1.8 V supply?

The LM393LVDR draws 25 µA per channel typical quiescent current at 1.8 V supply and 25°C ambient temperature, rising to 50 µA maximum across the full –40°C to +125°C range. This ultra-low current enables continuous operation in battery-backed systems such as vacuum robots, where the LM393LVDR contributes less than 0.1% of total standby power consumption.

Is the LM393LVDR pin-compatible with the legacy LM393DR?

No, the LM393LVDR is not pin-compatible with the standard LM393DR. While both are 8-pin SOIC dual comparators, the LM393LVDR uses a different pinout: IN1– is on pin 2 and IN1+ on pin 3, whereas the LM393DR places IN1+ on pin 2 and IN1– on pin 3. This reversal requires PCB layout revision; however, the LM393LVDR offers superior specs-including rail-to-rail inputs, POR, and lower IQ-justifying the redesign effort in new low-voltage designs.