LM393 Dual Differential Comparator IC

While microcontrollers are excellent at reading digital ones and zeros, the physical world is entirely analog. When you need a circuit to take a fluctuating analog signal like the fading light on a photoresistor or the rising heat of a thermistor and instantly convert it into a definitive "ON" or "OFF" digital trigger, the LM393 is the industry standard tool for the job.

This integrated circuit contains two completely independent differential voltage comparators inside a single 8-pin package. Each comparator actively monitors two input voltages: a reference voltage (your set threshold) and a variable voltage (from your sensor). If the sensor voltage rises above your threshold, the output pin instantly changes state. What makes the LM393 incredibly popular among circuit designers is its "open-collector" output stage. Instead of forcing a specific output voltage, it acts as an electronic switch to ground. By adding a simple pull-up resistor to the output, you can have this chip trigger a 3.3-Volt Raspberry Pi, a 5-Volt Arduino, or a 12-Volt industrial relay array, making it the ultimate logic-level translator.

Key Features & Functional Advantages

• Dual Independent Channels: Contains two separate comparators in one tiny package, allowing you to monitor two different sensors or create complex upper-and-lower "window" limits.

• Open-Collector Output: The output does not supply its own voltage; instead, it pulls down to ground. This allows you to safely interface the comparator with microcontrollers running at completely different logic levels using a simple pull-up resistor.

• Massive Voltage Range: Operates reliably on a single supply ranging from a mere 2 Volts all the way up to 36 Volts DC, making it equally suited for coin-cell battery projects and heavy industrial machinery.

• Low Power Consumption: Draws a very small amount of baseline current, ensuring it won't drain your batteries while waiting for a sensor threshold to be crossed.

• High Precision: Features a low input offset voltage, allowing the chip to accurately detect very small voltage differences between its inputs.

Perfect For

• Analog Sensor Modules: The exact chip found on almost all standard hobbyist sensor breakout boards (like sound sensors, line tracking modules, and light detectors) to provide a clean digital output.

• Window Comparators: Wiring the two internal channels together to monitor whether a battery voltage is safely sitting between an upper maximum limit and a lower minimum limit.

• Logic Level Shifting: Safely triggering low-voltage digital processors using high-voltage analog sensor signals.

• Overvoltage Alarms: Instantly triggering a warning buzzer or hardware shutdown when a power supply exceeds a safe preset limit, acting much faster than a microcontroller could.

Technical Specifications

• Device Type: Dual Differential Voltage Comparator

• Number of Channels: 2 Independent Comparators

• Operating Voltage Range: 2.0 Volts to 36.0 Volts DC (Single Supply)

• Output Type: Open-Collector (Requires external Pull-Up Resistor)

• Maximum Output Sink Current: Typically around 16 milliamps

• Package Type: 8-Pin Dual Inline Package (DIP-8) or Surface Mount (SOIC-8) depending on specific batch

Ensure your order is placed by 2PM to guarantee next-day delivery! Our commitment to prompt service includes a 24-hour delivery system through our network of carriers, aimed at ensuring your package arrives right on schedule.

Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.