LM311DR

LM311DR is the tape-and-reel SOIC-8 ordering code for the Texas Instruments LM311 voltage comparator, confirmed word-for-word on the TI order page for this exact code; the LM311 family is listed as ACTIVE and TI maintains a live order page for the DR code. It shows an input offset voltage of 2.0 mV typical and 7.5 mV maximum, input bias current of 100 nA typical and 250 nA maximum, supply current of 5.1 mA typical and 7.5 mA maximum, and a response time of 165 ns in the current TI parametrics, running from a single 3.5 V to 30 V supply or dual ±1.75 V to ±15 V rails over 0 °C to +70 °C, with an output stage that can drive loads up to 50 V and 50 mA. The selection point is the output flexibility of the classic 311 architecture: the uncommitted output transistor wires up as open-collector or open-emitter, so one comparator interfaces logic families at different voltages without a level shifter. Selection advice: response-time figures differ between the current TI tables and legacy National-era documents for this family - design from the TI figures above, and keep the offset budget on the 7.5 mV maximum rather than the typical when the trip threshold is set by a divider alone. Parameters verified against the TI LM311 product page parametrics and order page for this exact code.