Single comparator with a voltage reference on-chip
The Maxim Integrated MAX9039BEBT+T is a single comparator that integrates a voltage reference, saving the external reference resistor divider or reference IC that a standalone comparator would need. It delivers CMOS, push-pull, rail-to-rail, or TTL output drive, and the ±3mV hysteresis cleans up switching around the threshold — handy for sensor threshold detection or battery monitoring where you want a clean digital edge without extra passives.
Propagation delay and quiescent current
Propagation delay is 450ns maximum — moderate speed that works for most level-detection, over-voltage/under-voltage lockout, and window-comparator loops. It is not a high-speed PWM or zero-crossing detector part; if you need sub-100ns response, look elsewhere. Quiescent current maxes at 100µA, so it fits battery-operated gear where every microamp counts. The 8mA output drive is enough to light an LED or drive a logic gate input directly.
Input offset voltage is 1mV max at 5V, and input bias current is 1pA max, so high-impedance sources like pH probes or photodiode amplifiers are manageable.
Package and handling for the 6-WLP
The part comes in a 6-WLP (wafer-level package) — essentially the bare die with solder bumps, no plastic overmold. That means the package is the die itself, so handling requires ESD precautions and a clean, moisture-controlled environment. It is surface-mount only, and the 6-WLP footprint is tiny; rework needs a hot-air station with a fine nozzle and a steady hand. No lab, no bench — but if you have the kit, it is doable. The supplier device package is 6-WLP, and the case code is 6-WFBGA, WLBGA.