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Texas Instruments LM139AD — Analog & Data Acquisition

LM139AD Quad Differential Comparator, 14-SOIC

MPNLM139AD
End of Life

STMicroelectronics LM139AD, quad differential comparator, 14-SOIC package, single/dual supply 2V to 30V / ±1V to ±15V, 2mA max quiescent current, -55°C to 125°C operating temperature.

$5.0Ref. price · indicative, final on quote
Texas Instruments LM139AD datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM139AD specifications
ParameterValue
TypeDifferential
Output typeCMOS, MOS, Open-Collector, TTL
MountingSurface Mount
Voltage - input offset2mV @ 30V
Voltage - supply, single (Dual (±))2V ~ 30V, ±1V ~ 15V
Output current20mA
Current - quiescent2mA
Current - input bias0.1µA @ 5V
Operating temperature-55°C ~ 125°C
PackageTube
Case14-SOIC (0.154\", 3.90mm Width)
Number of elements4

Product details

Supply voltage and quiescent current — design margin for rail selection

The 2 V to 30 V single-supply range covers common industrial rails. The 2 mA maximum quiescent current (all four comparators) is moderate. The 0.1 µA maximum input bias current at 5 V suits high-impedance sources.

Input offset and output flexibility — threshold accuracy and logic interface

Maximum input offset voltage is 2 mV at 30 V supply. The open-collector outputs allow wired-OR connections and level translation. CMOS/MOS and TTL output compatibility means no extra level-shifter for mixed-voltage boards.

Package and mounting — 14-SOIC footprint for automated assembly

The 14-SOIC (0.154", 3.90 mm width) package is a standard surface-mount footprint shared by many quad op-amps and comparators.

The active status means standard lead times apply through the distribution channel; no premium or broker sourcing is required for normal procurement.

Frequently asked questions

What are the direct equivalents or replacements for LM139AD?

The LM139AD is a standard quad differential comparator in 14-SOIC. Pin-compatible equivalents include the TI LM139AD and the Analog Devices (ADI) quad comparator in the same footprint. The TLV9032DDFR is a different class — a dual, rail-to-rail, push-pull comparator with 100 ns propagation delay, not a direct functional replacement for the LM139AD's open-collector, wide-supply, quad configuration.

What is LM139AD's listed type (Differential) on this component line?

The listed type is Differential, meaning the comparator responds to the difference between its non-inverting and inverting inputs, not to a single-ended voltage relative to ground. This is standard for all comparators; the term distinguishes it from single-ended or rail-to-rail input structures.