UC3842BN

UC3842BN is a current-mode PWM controller from STMicroelectronics in a through-hole DIP-8 package. It generates the gate drive for offline flyback and forward converters and is a long-established choice for adapters, auxiliary supplies, battery chargers and industrial power stages where a straightforward, well-documented control IC shortens design and troubleshooting time. The current-mode control architecture is the defining feature of the UC3842 family, giving converters cycle-by-cycle current limiting behaviour that designers rely on when sizing the transformer and the sense network. The DIP-8 package remains convenient for hand assembly, prototyping and maintenance of older equipment where surface-mount rework is impractical. Buyers should note that this page covers the STMicroelectronics UC3842BN only; the E-UC3842BN variant is a different, obsolete order code and should not be treated as the same item. Selection and sourcing advice: work from the ST datasheet for this device when checking start-up thresholds, oscillator settings and drive capability, because UC3842 implementations from different manufacturers are not identical in every limit; quote the complete UC3842BN code in your RFQ so that the ST device in DIP-8 is what gets offered. Parameters verified against STMicroelectronics documentation.