LM393 Low Power Low Offset Voltage Dual Comparator IC SOIC-8

LM393 Low Power Low Offset Voltage Dual Comparator IC (SOIC-8) delivers fast, low-power voltage comparison for digital interfacing and sensing. Designers deploy it in threshold detection, window comparators, and zero-crossing detectors where low offset and open-collector outputs simplify level translation.

Key Features:

• Dual Comparators: Two independent precision comparators in one package.
• Wide Supply Range: Operates from 2 V to 36 V single supply or ±1 V to ±18 V dual supply.
• Low Input Offset: Typical 2 mV for accurate threshold detection.
• Open-Collector Outputs: Supports wired-OR and level shifting up to 36 V with a pull-up.
• Low Power: Typical supply current ~0.4 mA per comparator.
• Input Includes Ground: Common-mode range extends to ground for single-supply use.
• Fast Response: Propagation delay ~1.3 µs (typical).

Technical Specifications:

• Supply Voltage (V_CC): 2 V to 36 V (single) or ±1 V to ±18 V (dual)
• Input Offset Voltage: Typ 2 mV, Max ~7 mV
• Input Bias Current: Typ 25 nA
• Input Common-Mode Range: 0 V to V_CC − 1.5 V (includes ground)
• Output Type: Open-collector, sinks ≥ 16 mA (typical)
• Propagation Delay: ~1.3 µs (typ, with 5 mV overdrive)
• Operating Temperature: −40 °C to +85 °C
• Quiescent Current: ~0.4 mA per comparator (typ)

Mechanical Specifications:

• Package: SOIC-8 (surface-mount)
• Mounting: Standard SMT reflow compatible
• Lead Finish: Tin-plated leads
• Body Material: Molded epoxy resin

Dimensions:

• Package Footprint: Approx. 3.9 mm × 4.9 mm
• Lead Pitch: 1.27 mm
• Body Height: ~1.5 mm

Pinout and Wiring:

• Pin 1: OUT A (open collector)
• Pin 2: IN− A
• Pin 3: IN+ A
• Pin 4: GND / V−
• Pin 5: IN+ B
• Pin 6: IN− B
• Pin 7: OUT B (open collector)
• Pin 8: V_CC
• Use a pull-up resistor from each OUT pin to the desired logic rail. Add hysteresis with positive feedback for noisy signals.

Datasheet Reference:

• LM393 datasheet

Applications:

• Threshold and Window Detectors: Monitor battery, sensors, and rails.
• Zero-Crossing Detection: Shape AC or sensor signals for digital logic.
• Oscillators and Pulse Generators: Build relaxation oscillators and PWM blocks.
• Overcurrent/Overvoltage Protection: Trip comparators in power systems.

Equivalent Models:

• LM2903: Automotive/industrial grade dual comparator
• LM393A: Tighter offset variant
• TLC393 / LMV393: Low-voltage, low-power CMOS alternatives

Package Includes:

• 1 x LM393 Low Power Dual Comparator IC (SOIC-8)