STMicroelectronics LM339PT

Overview

LM339PT 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 1.1 mA typical supply current, ±1 mV typical input offset voltage, and rail-to-rail input common-mode range including ground. It drives TTL, CMOS, and MOS logic directly and is used in voltage monitoring, window detection, and analog-to-digital interface circuits.

For engineers reviewing the LM339PT datasheet, LM339PT pinout, LM339PT application, or LM339PT equivalent, key selection criteria include input offset voltage stability over temperature, output sink capability (6–16 mA), wide supply range compatibility, and TSSOP-14 thermal performance (R_thJA = 100 °C/W) in space-constrained industrial control designs.

Technical Context

The LM339PT implements four independent open-collector comparators with PNP differential input stages, enabling ground-sensing operation even on single supplies. Its input common-mode range extends from 0 V to (V_CC − 1.5 V), and differential input voltage tolerance equals full supply voltage (±36 V).

Output stage is optimized for sinking up to 16 mA at 250 mV saturation voltage (I_SINK = 4 mA), supporting direct interfacing with logic families without pull-up resistors. Response time is 1.3 μs (100 mV step, 5 mV overdrive) and improves to 300 ns with larger overdrive.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9 mm × 6.4 mm footprint, 0.65 mm pitch, 1.2 mm max height, R_thJA = 100 °C/W - optimized for compact PCB layouts with moderate thermal dissipation requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL339CDR and LM339DT, the LM339PT offers superior thermal performance in space-constrained designs and tighter offset voltage consistency, making it optimal for precision industrial monitoring where TSSOP-14 integration and long-term threshold stability are critical.

Availability

LM339PT is available at Aetrix Electronics and suitable for overvoltage protection, zero-crossing detection, thermal trip monitoring, and level translation requiring stable component supply across automotive, industrial automation, and power management programs.

Supply support for LM339PT 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 intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The LM339 series belongs to ST's precision analog comparators product line, engineered for robust, low-power voltage comparison in harsh environments with wide supply flexibility and ground-sensing capability.

FAQ

Can LM339PT operate from a 3.3 V single supply?

Yes - the LM339PT supports single-supply operation down to +2 V, making it fully compatible with 3.3 V systems. Its input common-mode range includes ground, and output saturation voltage remains ≤700 mV at 4 mA sink current, ensuring reliable logic-level interfacing without additional level-shifting circuitry.

Does LM339PT require external pull-up resistors on its outputs?

Yes - all four outputs are open-collector and must be pulled up to a valid logic-high voltage (e.g., V_CC or another rail). Typical values range from 1 kΩ to 10 kΩ depending on speed and drive strength requirements; lower resistance improves rise time but increases power consumption during low-state output conduction.

What is the maximum input voltage allowed when using LM339PT with a 24 V supply?

The absolute maximum input voltage is +36 V, regardless of supply voltage. However, the common-mode input range is limited to 0 V to (V_CC − 1.5 V); thus, at 24 V supply, inputs must stay within 0–22.5 V. Differential input voltage may reach ±36 V, allowing one input to exceed V_CC if the other remains within common-mode bounds.

How does LM339PT handle ESD in automated PCB assembly?

The LM339PT features 500 V HBM, 100 V MM, and 1500 V CDM ESD ratings per JESD22 standards. These levels meet IPC-7351B Class 2 requirements for surface-mount assembly, supporting standard reflow and handling protocols without special ESD mitigation - provided board-level grounding and handling follow IEC 61340-5-1 guidelines.