Product Overview
LM339N 14-Pin DIP Quad Comparator - Voltage Threshold Detection, Level Shifting, TTL/CMOS Logic Interface
Condition
Unused NOS - New Old Stock. Sourced from an electronics distributor consolidating inventory. Evaluation: Visual inspection only. Function testing not performed. No accessories included.
Ships same business day from Idaho. Packed carefully.
Product Overview
STMicroelectronics LM339N - four independent voltage comparators in a single 14-pin plastic DIP package. Each comparator accepts two analog inputs and drives an open-collector output to signal which input is higher. Compatible with TTL, DTL, ECL, MOS, and CMOS logic families. Supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply) suits a wide range of circuit designs.
Key Features
- 4 independent comparator channels
- 14-pin PDIP package - through-hole, breadboard compatible
- Supply voltage: 2V to 36V single supply / ±1V to ±18V dual supply
- Open-collector output - external pull-up resistor required
- Input offset voltage: 2 mV typical, 5 mV max
- Supply current: 0.8 mA typical (low power)
- TTL, DTL, ECL, MOS, and CMOS compatible
Applications
- Voltage threshold detection and limit alarms
- Battery voltage monitoring and over-current protection
- Level detectors and sensor interfaces in automation
- Square wave oscillators and window comparator circuits
- Analog-to-digital signal bridging in microcontroller designs
Frequently Asked Questions
Does this chip require a pull-up resistor?
Yes. The LM339N uses open-collector outputs. A pull-up resistor to your logic supply rail is required to obtain a logic-high output. Without it, the output will only pull low - it cannot drive high on its own.
Is this the same as an op-amp? Can I use it for audio amplification?
No. The LM339N is a voltage comparator, not an operational amplifier. It is optimized for switching between two states, not linear signal amplification. Using it in a linear audio circuit will produce severe distortion.
What package is this? Will it fit a standard breadboard or DIP socket?
The LM339N is a 14-pin plastic DIP (through-hole). It fits standard breadboards and 14-pin DIP sockets without modification.
The LM339N is a widely used, well-documented part. Datasheets and reference circuits are readily available from STMicroelectronics and major component databases.
