{"product_id":"lm393-dual-comparator-ic-low-power-wide-voltage-range","title":"LM393 Dual Comparator IC – Low Power, Wide Voltage Range","description":"\u003ch1\u003eLM393 Dual Comparator IC – Low Power, Wide Voltage Range\u003c\/h1\u003e\u003cp\u003eThe LM393 is a dual differential comparator designed to operate from a single or split power supply. It compares two input voltages and outputs a digital signal based on which is higher. With a wide supply voltage range, low current drain, and open-collector outputs, it's a go-to IC for signal conditioning, level detection, and voltage monitoring in embedded systems.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2V to 36V (single) or ±1V to ±18V (dual)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Offset Voltage\u003c\/td\u003e\n\u003ctd\u003eTypically 2mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Bias Current\u003c\/td\u003e\n\u003ctd\u003e25nA (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eOpen Collector (requires pull‑up)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Comparators\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eDIP‑8 (through‑hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWindow comparator for battery voltage monitoring\u003c\/li\u003e\n\u003cli\u003eOvervoltage protection circuit with relay driver\u003c\/li\u003e\n\u003cli\u003eLight\/dark detection threshold switch\u003c\/li\u003e\n\u003cli\u003eZero‑crossing detector for AC signal processing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThe LM393 operates over a supply range that matches common 3.3V and 5V logic levels, making it suitable for direct connection to Arduino, Raspberry Pi, or ESP32 boards. Its open‑collector outputs can sink up to 16mA, allowing direct drive of small relays or LEDs with a pull‑up resistor. It's often paired with transistor or MOSFET drivers for higher current loads.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect Vcc (pin 8) to your positive supply and GND (pin 4) to ground. Apply input signals to the non‑inverting (pins 3,5) and inverting (pins 2,6) terminals. Outputs (pins 1,7) require a pull‑up resistor (typically 4.7kΩ to 10kΩ) to Vcc to obtain a high logic level. Keep input voltages within the common‑mode range (0V to Vcc−1.5V) for reliable operation.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, you can power the LM393 from the Arduino's 5V pin. Connect its output to any digital input; a 10kΩ pull‑up resistor to 5V is needed for proper logic levels.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I use it as a zero‑crossing detector?\u003c\/summary\u003e\u003cp\u003eSet one input to ground and the other to your AC signal through a series resistor. The output will toggle on each zero crossing; a software debounce may be required.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat pull‑up resistor value should I choose?\u003c\/summary\u003e\u003cp\u003eA 4.7kΩ resistor is a good starting point for most applications. Lower values increase speed but draw more current; a 10kΩ value works well for low‑speed logic interfacing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445081596269,"sku":"CDN-0940","price":35.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_52387cae-3ad5-4acd-aba8-fd60e2be506f.jpg?v=1781513193","url":"https:\/\/compoden.com\/products\/lm393-dual-comparator-ic-low-power-wide-voltage-range","provider":"Compoden","version":"1.0","type":"link"}