Texas Instruments LM339AN

Overview

LM339AN from STMicroelectronics is a quad low-power voltage comparator in 14-pin PDIP (plastic dual in-line) package, designed for single-supply operation from +2 V to +36 V or dual supplies ±1 V to ±18 V. It features ±1 mV typical input offset voltage, 25 nA typical input bias current, and 250 mV typical low-level output saturation voltage at 4 mA sink current-enabling precise threshold detection in industrial control and power monitoring circuits.

For engineers reviewing the LM339AN datasheet, LM339AN pinout, LM339AN application, or LM339AN equivalent, key selection considerations include input common-mode range extending to ground on single supply, TTL/CMOS-compatible open-collector outputs, and guaranteed operation across 0 °C to +70 °C ambient temperature.

Technical Context

The LM339AN integrates four independent PNP-input comparators with rail-to-rail differential input voltage capability up to ±36 V and common-mode input range from 0 V to (V_CC − 1.5 V). Its input stage draws only 25 nA bias current and exhibits minimal loading on reference sources due to constant-current sourcing behavior.

Each comparator delivers open-collector output capable of sinking ≥6 mA while maintaining ≤700 mV saturation voltage at 4 mA load. Response time is 1.3 μs (100 mV step, 5 mV overdrive) and improves to 300 ns with larger overdrive-supporting reliable level-shifting and fast edge detection in analog interface circuits.

Key Specifications

Pinout & Package

LM339AN is supplied in a 14-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole mounting. Pin spacing follows JEDEC MS-001BA, compatible with legacy PCB footprints and wave-solder processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and TL331IDBVR, the LM339AN offers drop-in compatibility with legacy through-hole systems, identical electrical behavior across temperature, and proven reliability in long-lifecycle industrial deployments-making it optimal for cost-sensitive, serviceable, or repair-oriented hardware.

Availability

LM339AN is available at Aetrix Electronics and suitable for industrial power monitors, automotive battery supervisors, appliance motor control interfaces, and medical sensor signal conditioning requiring stable component supply across extended production lifecycles.

Supply support for LM339AN 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering microcontrollers, analog ICs, power management, and MEMS solutions for industrial, automotive, and consumer markets.

The LM339 family belongs to ST's precision analog comparators product line, engineered specifically for robust, low-cost threshold detection in harsh environments-emphasizing ground-sensing capability, wide supply tolerance, and long-term parametric stability.

FAQ

Can LM339AN operate from a single 3.3 V supply?

Yes. The LM339AN supports single-supply operation down to +2 V, making it fully functional at 3.3 V. Input common-mode range extends to ground, and output saturation remains below 400 mV at 4 mA sink-ensuring clean logic transitions into 3.3 V CMOS inputs when paired with a 3.3 V pull-up resistor.

Does LM339AN require external hysteresis for noise immunity?

Not inherently-the device has no built-in hysteresis. For noisy input signals (e.g., motor back-EMF or unfiltered sensor outputs), external positive feedback (e.g., 1 MΩ from output to non-inverting input) must be added to create 10–50 mV of hysteresis, preventing multiple toggles near threshold crossings.

What is the maximum sink current per output of LM339AN?

The LM339AN output can continuously sink up to 16 mA per channel (per datasheet Table 3, ISINK = 6–16 mA min/max), with 250 mV typical saturation voltage at 4 mA. Sustained 16 mA operation requires derating above +50 °C ambient to maintain junction temperature ≤150 °C.

Is LM339AN pin-compatible with LM339N or LM339D?

Yes-LM339AN, LM339N, and LM339D share identical 14-pin PDIP pinout and electrical specifications. The "A" suffix denotes improved initial offset voltage (±1 mV typ. vs. ±2 mV typ. for non-A versions), but all function identically in existing designs and require no layout changes.