STMicroelectronics LM339APT

Overview

LM339APT from STMicroelectronics is a low-power quad voltage comparator in TSSOP-14 package, designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V dual supply), featuring ±1 mV typical input offset voltage, 25 nA typical input bias current, and 250 mV typical output saturation voltage at 4 mA sink current - used in precision threshold detection, window comparators, and analog-to-digital interface circuits.

For engineers reviewing the LM339APT datasheet, LM339APT pinout, LM339APT application, or LM339APT equivalent, key selection considerations include input common-mode range extending to ground on single supply, TTL/CMOS-compatible open-collector outputs, wide temperature range (0 °C to +70 °C), and thermal resistance of 100 °C/W (junction-to-ambient).

Technical Context

The LM339APT implements 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 - enabling direct ground-referenced sensing without level-shifting. Its open-collector outputs support wired-OR logic and mixed-voltage interfacing.

Each comparator delivers 1.1 mA typical supply current independent of V_CC, 1.3 μs typical response time at 100 mV overdrive, and maintains stable operation across industrial ambient temperatures (0 °C to +70 °C) with no internal compensation required.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9–5.1 mm × 6.2–6.6 mm footprint, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant ECOPACK®2 package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DT and TLV339IPWR, the LM339APT uniquely balances wide supply range (+2–36 V), ground-referenced input operation, open-collector flexibility, and compact TSSOP-14 packaging - making it optimal for industrial sensor interfaces where voltage headroom and layout density both matter.

Availability

LM339APT is available at Aetrix Electronics and suitable for overvoltage protection circuits, zero-crossing detectors, transducer signal conditioning, and crystal oscillator enable logic requiring stable component supply across industrial temperature ranges.

Supply support for LM339APT 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The LM339 series 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 LM339APT operate from a single 3.3 V supply?

Yes - the LM339APT supports single-supply operation down to +2 V. At 3.3 V, its input common-mode range spans 0 V to 1.8 V, and output saturation remains below 400 mV at 4 mA sink, ensuring reliable interfacing with 3.3 V logic families when paired with appropriate pull-up resistors.

Does LM339APT require external hysteresis for noise immunity?

Yes - the LM339APT has no internal hysteresis. For noisy input signals (e.g., from inductive sensors), external positive feedback (e.g., 1 MΩ resistor from output to non-inverting input) must be added to create 10–50 mV of hysteresis, preventing multiple transitions near threshold.

What is the maximum sink current per output of LM339APT?

The LM339APT output can continuously sink up to 16 mA per channel (per datasheet Table 3, ISINK = 6–16 mA). Sustained operation above 6 mA increases output saturation voltage and junction temperature - derating is recommended above 10 mA in TSSOP-14 packages.

Is LM339APT pin-compatible with LM339DT?

Yes - LM339APT (TSSOP-14) and LM339DT (SO-14) share identical pin numbering and electrical functionality. However, PCB layout, thermal relief, and soldering profiles differ significantly due to package geometry and thermal pad absence in TSSOP-14.