The LM2903BIDGKR is a dual differential comparator with a 2V to 36V single-supply or ±1V to ±18V dual-supply range. Its open-collector output interfaces with logic families at a different voltage than the comparator's supply.
Supply range and output flexibility — the BOM-fit decision
A 2V to 36V single-supply range means this comparator can share a 3.3V logic rail or a 24V industrial bus without a secondary regulator. The open-collector output (rated for CMOS, MOS, and TTL compatibility) lets you pull up to a different voltage than Vcc — for example, a 5V pull-up on the output while the comparator runs from 24V. That saves a level-shifter IC on the BOM.
Speed and precision — what the 1µs delay and 2.5mV offset mean
The 1µs typical propagation delay is adequate for line-frequency monitoring (50/60Hz zero-cross detection), overvoltage/undervoltage lockout, and slow sensor threshold circuits. It is not fast enough for switching-regulator feedback loops or high-frequency PWM control — those need sub-100ns comparators. The 2.5mV maximum input offset at 36V is standard for an industrial-grade part; it will not drift enough to cause false triggers in a thermostat or a pressure-switch monitor, but it is not a precision nulling device. The 0.025µA maximum input bias current at 5V means negligible loading on high-impedance sources like thermocouples or photodiode amplifiers.
The LM2903BIDGKR comes in an 8-VSSOP package (the supplier device package code), which is the same 3.00mm-width footprint as the 8-TSSOP and 8-MSOP options. It is a surface-mount part, so plan for standard reflow soldering. The dual-element layout means two independent comparators in one package, saving board area versus two single-channel devices.
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