UC3845BD1R2G

UC3845BD1R2G is an onsemi high-voltage current-mode PWM controller in an SOIC-8 package (case 751), for offline flyback and forward converters. Its undervoltage lockout is 8.5 V on / 7.6 V off, switching frequency reaches 500 kHz, the maximum duty cycle is held near 50% by the internal toggle flip-flop (deadtime adjustable over roughly 50% to 70%), and the totem-pole output sources and sinks 1.0 A; this code is the commercial 0 to +70 °C grade. Selection advice: within the UC384xB family the member digit sets the UVLO and duty-cycle behaviour — the UC3845's ~50% duty cap suits single-ended forward and flyback stages that must never cross 50%, unlike the 96%-duty UC3843B — and use the SOIC-8 values here, not the SOIC-14 variant's, and do not treat the industrial UC2845B as an equivalent. The code is formed from the UC384xBD1R2G ordering row of the onsemi UC3844B/UC3845B datasheet, and authorized distributor listings carry it as Active. Parameters verified against onsemi documentation.