4.38V threshold supervisor in SC-70-3
The MIC803-44D2VC3-TR is a single-channel voltage supervisor from Microchip Technology that asserts a reset signal when the monitored supply drops below 4.38V and holds reset for at least 20ms after the supply returns above threshold. The open-drain, active-low output lets multiple supervisors share a common pull-up resistor on a wired-OR reset bus — a common topology in multi-rail systems where any undervoltage must force a system-wide reset.
Temperature range and package fit
Housed in the 3-lead SC-70 (SOT-323) package, the 0.65mm pitch and 2.0mm × 2.1mm footprint fit densely populated boards where a SOT-23 would crowd the passives around a processor's reset pin.
Active production, no cross-reference on record
No official pin-compatible second source or manufacturer cross-reference is documented for this exact 4.38V threshold variant in the SC-70-3 package.