Product Overview
STMicroelectronics LM393N Dual Voltage Comparator DIP-8
Condition
Used equipment pull. Markings legible: ST logo, TAI, LM393N, AAB644. Through-hole leads show solder residue from previous equipment installation. Visual inspection completed; functional testing not performed.
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Product Overview
STMicroelectronics LM393N is an industry-standard dual independent precision voltage comparator in an 8-pin plastic dual in-line package (DIP-8). Designed to operate from a single power supply across a wide voltage range or from dual supplies, it features low quiescent current drain and open-collector output stages compatible with TTL, DTL, MOS, and CMOS logic.
Key Features
- Dual independent comparator channels in an 8-pin DIP package
- Wide supply voltage range: 2.0 V to 36 V single supply or ±1.0 V to ±18 V dual supply
- Low supply current drain of 0.8 mA typical, independent of supply voltage
- Input common-mode voltage range includes ground
- Low input bias current of 250 nA maximum
- Open-collector output configuration for flexible logic interfacing and wired-OR connections
- Operating temperature range from 0°C to +70°C
Applications
- Breadboard prototyping and testing of analog threshold detection circuits
- Component-level repair and maintenance on vintage industrial control and power boards
- DIY electronic builds including zero-crossing detectors, window comparators, and oscillators
Frequently Asked Questions
What is the pin configuration for the LM393N?
The LM393N follows the standard 8-pin dual comparator layout: Pin 1 Output A, Pin 2 Inverting Input A, Pin 3 Non-Inverting Input A, Pin 4 Ground/Negative Supply, Pin 5 Non-Inverting Input B, Pin 6 Inverting Input B, Pin 7 Output B, and Pin 8 Positive Supply.
Does the LM393N require external pull-up resistors?
Yes. Because the LM393N uses open-collector outputs, external pull-up resistors tied to the desired positive logic rail are required to establish a high logic level.
Why buy an individual pulled comparator instead of a bulk reel?
For a focused repair bench or breadboard project, buying the single verified STMicroelectronics part you need saves you from storing unused multi-packs. Shipping is $8 flat rate, free on orders over $28, and orders leave our Idaho warehouse the same or next business day.
Through-hole analog utility from the days when building a circuit meant dropping a DIP into a breadboard. Plug it into your socket and let the switching thresholds do the rest.
