Product Overview
National Semiconductor LM339N - Low-Power Quad Voltage Comparator, Open-Collector Output, TTL/CMOS/DTL Compatible
Condition
Unused NOS - New Old Stock. Sourced from legacy electronics supply chain recovery. Evaluation: Visual inspection only. Function testing not performed. Backed by our no-hassle satisfaction guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
National Semiconductor LM339N. Low-power, low-offset-voltage quad comparator in a 14-pin through-hole DIP package. Contains four independent comparator circuits. Operates on single or dual supply voltages. Open-collector outputs interface directly with TTL, CMOS, and DTL logic.
Key Features
- Four independent comparator channels in a single package
- Supply voltage: 2V to 36V (single supply) or ±1V to ±18V (dual supply)
- Open-collector output - requires external pull-up resistor
- Response time: 1.3 µs
- Package: 14-pin through-hole DIP - breadboard compatible
- Logic compatible: TTL, CMOS, DTL
Applications
- Voltage threshold detection and level monitoring
- Zero-crossing detectors and oscillator circuits
- Battery monitors and power supply supervisors
- Repair and restoration of vintage computing, arcade, and analog synthesizer hardware
Frequently Asked Questions
Does this require an external pull-up resistor?
Yes. The LM339N has open-collector outputs. Each output channel must be connected to a pull-up resistor tied to the supply rail to function as a logic switch.
Is this the through-hole DIP version, not the surface-mount version?
Yes. The LM339N is the 14-pin through-hole plastic DIP. The surface-mount version is the LM339M (SOIC). These are not interchangeable.
Is this a National Semiconductor part or a Texas Instruments reissue?
This is National Semiconductor stock recovered from legacy supply chains. National Semiconductor was acquired by TI in 2011. Chips from this recovery carry the original NSC branding - confirm by the logo on the package before purchase if vintage authenticity is required.
Can this be used as a drop-in replacement for an LM339 from another manufacturer?
The LM339N is a standard pinout and electrically equivalent to LM339N parts from other manufacturers. Verify your circuit's temperature range requirements if considering the LM239 or LM139 grades instead.
