Specs side by side
2 parts compared · 0 differing specs across 5 total parameters.
| Parameter | ||
|---|---|---|
| Case | DIP-8 / SOIC-8 | DIP-8 / SOIC-8 |
| Component Category | Current-Mode PWM Controllers | Current-Mode PWM Controllers |
| Market Reality | The UC384x family is the current-mode PWM controller inside a generation of offline switching supplies, adapters, chargers and ATX standby rails - an 8-pin part that appears in repair in every country, and the most-fitting-wrong-part in power-supply benches. The four suffixes are not interchangeable decorations: the start-up threshold is either 16V (3842/3844, offline rails) or 8.4V (3843/3845, low-voltage rails), and the maximum duty cycle is either full (3842/3843) or 50 percent (3844/3845, for half-bridge and push-pull topologies). The wrong suffix shows up as a supply that will not start, or a transformer that saturates. | The UC384x family is the current-mode PWM controller inside a generation of offline switching supplies, adapters, chargers and ATX standby rails - an 8-pin part that appears in repair in every country, and the most-fitting-wrong-part in power-supply benches. The four suffixes are not interchangeable decorations: the start-up threshold is either 16V (3842/3844, offline rails) or 8.4V (3843/3845, low-voltage rails), and the maximum duty cycle is either full (3842/3843) or 50 percent (3844/3845, for half-bridge and push-pull topologies). The wrong suffix shows up as a supply that will not start, or a transformer that saturates. |
| Role In Circuit | Original Reference Part | Original Reference Part |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | Active Shenzhen Spot Sourcing (24–48h) |