Product Overview
LM339N Quad Comparator IC, 14-Pin DIP, Open-Collector Output, TTL/CMOS Compatible
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Sourced through our network of surplus and legacy suppliers. Backed by our no-hassle satisfaction guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Texas Instruments LM339N — low-power quad differential voltage comparator in a 14-pin PDIP (through-hole) package. Houses four independent comparator channels in one chip. Compares two input voltages and drives an open-collector output high or low based on which input is larger. Compatible with TTL, DTL, ECL, MOS, and CMOS logic families.
Key Features
- 4 independent comparator channels
- Supply voltage: 2V to 36V (single) or ±1V to ±18V (dual)
- Output type: Open-collector — external pull-up resistor required
- Response time: 1.3 µs
- Supply current drain: 1.1 mA typical
- Package: 14-pin PDIP — breadboard and through-hole compatible
- Logic family compatible: TTL, DTL, ECL, MOS, CMOS
Applications
- Battery voltage monitoring and low-voltage detection
- Power supply supervision and level detection
- Zero-crossing detectors
- Analog synthesizer waveform shaping
- Retro electronics repair — 80s/90s computing and arcade hardware power rails
Frequently Asked Questions
Does this chip require an external pull-up resistor?
Yes. The LM339N uses an open-collector output. Without an external pull-up resistor connected to the output pin, a logic-high signal will not be generated. This is a design requirement, not a defect.
Is this compatible with Arduino, TTL, or CMOS circuits?
Yes. The LM339N is confirmed compatible with TTL, DTL, ECL, MOS, and CMOS logic families, making it suitable for interfacing analog sensors with digital microcontrollers including Arduino.
What is the difference between LM339N and LM339AN?
The LM339AN is a precision variant with tighter input offset voltage. The LM339N is the standard version. Both use the same 14-pin PDIP package and open-collector output.
Is this suitable for high-frequency or audio amplification applications?
No. The 1.3 µs response time is too slow for high-speed data transmission. The LM339N is a comparator, not an op-amp — using it in an audio feedback loop will produce poor results.
