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Product Overview

LM393DR2G is a widely used dual-channel voltage comparator in the classic LM393 series. It has two independent comparators built in to compare two input voltages. The output is an open drain structure that is suitable for a variety of logic and level environments. The device supports a supply voltage range of 2V to 36V or ±1V to ±18V. It is designed for industrial environments and has reliability and anti-interference capabilities.

Key technical parameters

• Comparator type: dual voltage comparator
• Supply voltage: 2V to 36V, DC wide input
• Input voltage range: ground to VCC – 1.5V
• Offset voltage: typical value is about 2–5mV (room temperature)
• Reference rise time: about 5μs for hysteresis trigger
• Comparison speed: 20kHz – 500kHz (based on pull-up resistor and input step conditions)
• Output structure: open-drain push-pull type, external pull-up resistor required
• Output current capability: maximum 16mA under sank current
• Input bias current: ±25nA (room temperature)
• Operating current: maximum about 200μA per comparator
• Operating temperature range: –40°C to +125°C
• Package type: SOIC‑8 / TSSOP‑8 / TSOP‑8 industrial-grade package
• Functional advantages and highlights
• Wide power supply compatibility: suitable for single-power supply and dual-power supply systems
• Open-drain output flexibility: supports TTL, CMOS Level output, very simple pull-up connection
• Low offset ensures accuracy: suitable for fine measurement and analog regulation control
• Low power design: very suitable for battery-powered or multi-channel comparison occasions
• Industrial-grade temperature coverage: suitable for high/low temperature environments, stable and reliable
• Simplified input bypass: no need for too many external components, simple design

Typical application scenarios

• Sensor threshold detection: temperature, pressure, photoelectric and other analog signal detection
• Voltage overload/undervoltage monitoring: protection circuit in DC-DC power supply, UPS, battery system
• LED drive or optocoupler isolation trigger
• Independent pulse generator/square wave oscillator
• Hardware watchdog comparison interference: used for reset detection or voltage monitoring module

Pin function description (TSOP‑8)

Pin number Name Function description

1 OUTA Comparator A open drain output
2 INA‑ Comparator A negative input
3 INA+ Comparator A positive input
4 V– / GND Common ground/negative power supply pin
5 INB+ Comparator B positive input
6 INB– Comparator B negative input
7 OUTB Comparator B open drain output
8 V+ positive power supply terminal (+2V to +36V)

Design and wiring recommendations

• Pull-up resistor selection: 10kΩ is a common pull-up resistor value, connected to the target logic level.
• Decoupling capacitor: Place a 0.1µF ceramic capacitor between V+ and GND to filter out power supply noise.
• Input layout optimization: If low offset or high precision events are used, wiring can be close to the sensor input and filter resistors can be used.
• Output protection design: If the output is connected to a high load device (such as an LED), it is recommended to add a current limiting resistor.
• Module packaging: It is recommended to partition the analog ground and digital ground wiring to reduce noise interference.

Compatible and alternative models recommended

Model Comparison type Package form Features

• LM393DR2G Dual comparator TSOP‑8 Classic industrial model
• MCP6542 Dual low offset comparator SOT‑23‑5 Lower input offset voltage
• TLV7031* Single channel, ultra-low power SC‑70 Low voltage dropout low power version
• LM311 Single channel, open collector output DIP8 / SOIC8 Provide pulse trigger, adapt to TTL level

Summary

LM393DR2G is a classic and reliable dual-channel voltage comparator with industrial-grade power supply compatibility, low power consumption, high anti-interference and precise Schmitt input performance. It is suitable for building various analog detection, hardware protection, frequency detection and automatic control circuits. Its simple design and industry compatibility make it the preferred comparator device for engineers.
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