Differential comparator in 8-SOIC — supply range and output stage
The Texas Instruments LP211D is a single-element differential comparator in an 8-SOIC surface-mount package, with open-collector and open-emitter outputs. It accepts a wide supply range: single 3.5 V to 30 V, or dual ±1.75 V to ±15 V.
Input offset and bias — what matters for threshold accuracy
Maximum input offset voltage is 7.5 mV at ±15 V supply — this sets the achievable threshold precision in window comparators or zero-crossing detectors. Maximum input bias current is 0.1 µA at ±15 V, which keeps the voltage drop across high-impedance source resistors low enough to avoid shifting the trip point. Quiescent current draws 300 µA max — low enough for battery-powered threshold sensing where the comparator stays on continuously.
Package and rework — 8-SOIC on the bench
Supplied in tube — the tubes protect the leads during handling, but the parts are loose, so a pick-and-place feeder requires a tube-to-tape adapter or manual loading.