The STEF12 is a 12V line electronic fuse. It has a continuous current of 3.6A, an N-channel on-resistance of 53 mΩ, enable/fault functions, an output clamp voltage of 15 V, undervoltage lockout, short-circuit limit, overload current limit, controlled output voltage ramp, thermal latch of 165 °C, tiny capacitors, a working junction temperature of -40 °C to 125 °C, and a DFN10 (3x3 mm) package. It is mainly used in hard disk drives, solid state drives (SSD), hard disk and SSD arrays, set-top boxes, DVD and Blu-ray disc drivers.
The STEF12 is an integrated electronic fuse designed for 12 V power lines, optimized for monitoring output current and input voltage. It connects in series to a 12 V rail to protect electronic circuitry on its output from overcurrent and overvoltage conditions. The device features a controlled delay and turn-on time, limiting output current to a predefined safe value during overload conditions.
| Continuous current (typ) | 3.6 A |
|---|---|
| On-resistance (typ) | 53 mΩ |
| Output clamp voltage (typ) | 15 V |
| Thermal latch (typ) | 165 °C |
| Operating junction temp. | -40 °C to 125 °C |
| Package | DFN10 (3x3 mm) |
| Output clamping voltage (max) | 16.2 V |
| Undervoltage lockout (typ) | 8.5 V |
The typical continuous current is 3.6 A.
The typical thermal latch temperature is 165 °C.
Yes, an external capacitor can be added to the dv/dt pin to increase the ramp time.