LM393 Dual Voltage Comparator IC DIP-8 – Open-Collector, 2V–36V Single Supply

LM393 Dual Voltage Comparator IC – DIP-8

The LM393 is the industry-standard dual voltage comparator – a dedicated IC designed specifically for comparing two analog voltages and producing a digital output. With open-collector outputs, wide supply voltage range (2V–36V single supply), and the ability to interface directly with TTL and CMOS logic, the LM393 is the go-to comparator for sensor threshold detection, zero-crossing detection, and analog-to-digital signal conversion. Two comparator channels in one DIP-8 package.

Electrical Specifications

• Part Number: LM393 / LM393N / LM393P
• Package: DIP-8 (through-hole, 2.54mm pitch)
• Comparators: 2 (dual, independent)
• Output Type: Open-collector (requires external pull-up resistor)
• Supply Voltage: 2V – 36V (single) / ±1V – ±18V (dual)
• Input Common-Mode Range: GND to VCC−1.5V
• Response Time: 1.3μs (typical, 5mV overdrive)
• Output Sink Current: 16mA (max)
• Supply Current: 0.8mA (typical)
• Operating Temperature: 0°C to +70°C

Typical Applications

• Sensor threshold detection: Temperature, light, pressure sensor alarm circuits
• Zero-crossing detection: AC waveform zero-crossing for phase control
• Window comparator: Detect if signal is within a voltage window
• Battery monitor: Low-battery detection and alert circuits
• Schmitt trigger: Add hysteresis with positive feedback for noise-immune switching
• Arduino analog comparator: External comparator for faster response than internal ADC

Package Contents

• 1 × LM393 DIP-8 dual voltage comparator IC

Two precision comparators, open-collector outputs, 2V–36V supply – the LM393 is the correct tool for any voltage comparison task in analog and mixed-signal circuit design.