BUK203-50Y TOPFET is a high side switch produced by Philips Semiconductors. It adopts MOSFET technology and has temperature protection and overload protection functions. The rated load current is 1.6A and the maximum continuous load current is 4A. The working temperature is 150℃ and the switch resistance is 220mΩ.
The Philips BUK203-50Y is a PowerMOS transistor designed as a TOPFET high side switch. It features monolithic temperature and overload protection based on MOSFET technology in a 5-pin plastic envelope (SOT263). The device acts as a single high-side switch suitable for driving lamps, motors, solenoids, and heaters.
| Nominal load current (ISO) | 1.6 A |
|---|---|
| Continuous off-state supply voltage | 50 V |
| Continuous load current | 4 A |
| On-state resistance (typical) | 220 mΩ |
| Continuous junction temperature | 150 °C |
Yes, it includes overtemperature protection that self resets with hysteresis.
It can handle up to 1.4 J of non-repetitive clamping energy at a junction temperature of 150 °C.
The total switching time during turn-on is typically 40 ns under specified test conditions.