Texas Instruments LM339D

Overview

LM339D from Texas Instruments is a quad differential comparator IC designed for single-supply operation across 2V to 36V, featuring 0.37mV typical input offset voltage, 200µA per comparator quiescent current, and 1µs response time-used in server PSU overvoltage detection, motor drive enable logic, and appliance safety interlocks.

For engineers reviewing the LM339D datasheet, LM339D pinout, LM339D application, or LM339D equivalent, this page delivers verified electrical specs, SOIC-14 package details, real-world use cases in industrial power systems, and two validated alternative parts with documented functional trade-offs.

Technical Context

The LM339D implements four independent open-collector comparators with rail-to-rail common-mode input range (down to ground), ±38V differential input capability, and TTL/MOS/CMOS-compatible outputs. Its architecture supports direct interface with microcontroller GPIOs and discrete pull-up networks without level-shifting.

It operates over –40°C to +85°C ambient temperature, maintains stable quiescent current independent of supply voltage, and integrates ESD protection rated at 2kV HBM-enabling robust deployment in noisy factory automation and UPS control circuits.

Key Specifications

Pinout & Package

LM339D is housed in a 14-pin SOIC package (8.70mm × 3.90mm body size) with standard JEDEC MS-012AC footprint and gull-wing leads for automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad comparator applications.

Compared with LM339DR and LM2901DT, the LM339D offers identical core performance in the standard industrial temperature grade, with tube packaging enabling manual placement and field replacement-making it optimal for service depots and low-volume control panel builds.

Availability

LM339D is available at Aetrix Electronics and suitable for server PSU monitoring, vacuum robot safety logic, and cordless power tool battery management requiring stable component supply across extended product lifecycles.

Supply support for LM339D 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 specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal chain and power management ICs.

The LM339D belongs to TI's legacy quad comparator family, engineered for reliability in industrial power conversion, motor control, and safety-critical monitoring systems where predictable analog decision-making is essential.

FAQ

What is the maximum supply voltage for LM339D?

The LM339D supports a maximum supply voltage of 36V, with absolute maximum rating up to 38V. This allows direct integration into 24V and 36V industrial control rails without external regulators, and its design accommodates transient overvoltage events common in motor drive and UPS applications. The LM339D maintains full functionality across the 2V to 36V range, making it suitable for both low-power sensor nodes and high-voltage power system monitoring.

Does LM339D have rail-to-rail input capability?

Yes, the LM339D features a rail-to-rail common-mode input voltage range that includes ground (V–) and extends to within 2V of VCC. This enables direct comparison of signals referenced to ground or near the positive rail-critical for single-supply systems like battery-powered tools and server PSUs. Both inputs can tolerate voltages up to VCC without damage, though only one needs to remain within the valid common-mode window for correct operation. This behavior is confirmed in the LM339B/LM2901B datasheet Section 6.7.

What is the typical input offset voltage of LM339D?

The LM339D has a typical input offset voltage of ±0.37mV at 25°C and across its full 5V–36V supply range. Over the industrial temperature range (–40°C to +85°C), the maximum offset is ±5.5mV. This low offset enables accurate threshold detection in precision applications such as Li-ion cell voltage monitoring and HVAC temperature setpoint control, where errors below 10mV are required for reliable system behavior.

Can LM339D outputs drive TTL logic directly?

Yes, LM339D outputs are fully compatible with TTL, MOS, and CMOS logic families. Its open-collector outputs can sink up to 25mA and interface directly with TTL inputs when paired with an appropriate pull-up resistor (typically 1kΩ–10kΩ to VCC or another logic rail). No level-shifting circuitry is needed, simplifying design in mixed-voltage systems like industrial PLCs where 5V logic controls 24V actuators via comparator decisions.

What package type is used for LM339D?

The LM339D uses a 14-pin SOIC (Small Outline Integrated Circuit) package with nominal body dimensions of 8.70mm × 3.90mm. It follows JEDEC MS-012AC standards, features gull-wing leads, and is RoHS-compliant. This surface-mount package supports automated reflow assembly and provides thermal performance characterized at RθJA = 111.2°C/W, making it suitable for dense industrial PCB layouts where space and thermal management are constrained.