Product Overview
LM339N Quad Comparator IC - 4-Channel Open-Collector, 2V-36V, DIP-14 Through-Hole
Condition
Unused NOS - New Old Stock. Sourced from an electronics distributor consolidating inventory. Evaluation: Visual inspection only. Function testing not performed. National Semiconductor-branded production - NS logo, not TI.
Ships same business day from Idaho. Packed carefully.
Product Overview
LM339N is a low-power, low-offset-voltage quad voltage comparator from National Semiconductor. Contains four independent open-collector comparator channels in a standard 14-pin through-hole DIP package. Compatible with TTL, CMOS, and DTL logic. Breadboard-ready.
Key Features
- Four independent comparator channels
- Supply voltage: 2V to 36V single supply, or ±1V to ±18V split supply
- Output type: Open-collector - requires external pull-up resistor for logic-high output
- Response time: 1.3 µs
- Package: 14-DIP, through-hole
- Logic compatible: TTL, CMOS, DTL
- Output sink current: up to 16 mA
Applications
- Voltage threshold detection and level sensing
- Battery monitor and power supply supervisor circuits
- Zero-crossing detectors and limit switch circuits
- Analog synthesizer modules - waveform shaping, VCO, and envelope circuits
- Retro computing repair - Apple II, Commodore, and arcade hardware power boards
Frequently Asked Questions
Does this require a pull-up resistor?
Yes. The LM339N has an open-collector output. It can only sink current - it cannot drive a logic-high on its own. An external pull-up resistor to your supply voltage is required for a complete output circuit.
Is this the same as an op-amp like the LM324?
No. The LM339N shares the DIP-14 footprint with the LM324 but is not an op-amp. It is optimized for high-speed switching and comparator functions. It will not perform correctly if substituted into linear amplification circuits.
How do I confirm this is original National Semiconductor production and not TI?
Look for the NS or wavy-line logo on the chip body. National Semiconductor was acquired by Texas Instruments in 2011. Stock bearing the TI logo indicates post-acquisition production. This stock is sourced as National Semiconductor-branded NOS.
What is the difference between the LM339N and the LM339AN?
The LM339AN is a precision variant with a lower input offset voltage specification. The LM339N is the standard-grade version. For most repair and DIY applications the LM339N is the correct part.
Backed by our no-hassle satisfaction guarantee. Verify supply voltage and pull-up resistor requirements against your schematic before installation.
