Supply range and input characteristics
The LM393ADT operates from a single 2V to 36V supply or dual ±1V to ±18V rails — this wide compliance means the same comparator works across 3.3V logic, 5V industrial, 12V automotive, and 24V panel supplies without a secondary regulator. Maximum input bias current is 0.1µA at 5V — low enough that a 10kΩ source resistor drops only 1mV, preserving threshold accuracy in high-impedance sensor interfaces like thermistor bridges or photodiode transimpedance stages. Input offset voltage is trimmed to 2mV max at 30V — for a window comparator monitoring a 0-10V analog signal, this offset contributes less than 0.02% of full-scale error, well within the guard band of most 8-bit ADC thresholds.
Output drive and logic compatibility
Typical output sink current is 18mA at 5V — enough to drive a standard LED (10-15mA), a small relay coil via a base resistor, or the input of a CMOS/TTL gate without a buffer transistor. The open-collector output stage interfaces directly with CMOS, DTL, ECL, MOS, and TTL families — a single pull-up resistor to the logic rail sets the high-level voltage, making the LM393ADT a universal level translator between sensor domains and logic families.
Package and temperature grade
Housed in an 8-SOIC (0.154-inch width, 3.90mm body) with a standard 1.27mm lead pitch — the footprint matches the JEDEC MS-012AA land pattern, which is shared by thousands of op-amps and comparators, so a board spin for a second-source is rarely needed.
Lifecycle and sourcing posture
ROHS3 compliant — no exemption expiry risk for EU/RoHS-regulated markets.