Overview
The STEF12EPUR is an integrated electronic fuse designed and manufactured by STMicroelectronics. This device is optimized for monitoring and regulating output current and input voltage, particularly in 12 V power rails. It provides comprehensive protection against overcurrent and overvoltage conditions, ensuring the safety and reliability of electronic circuitry. The STEF12EPUR features a controlled delay and turn-on time, and it can limit the output current to a predefined safe value during overload conditions. Unlike mechanical fuses, this electronic fuse does not degrade in performance after short-circuit or thermal protection interventions and can be reset by recycling the supply voltage or using the Enable pin.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | STEF12EPUR |
| Continuous Current (typ.) | 3.6 A |
| N-channel On-resistance (typ.) | 45 mΩ |
| Supply Voltage - Min. | 7.6 V |
| Supply Voltage - Max. | 18 V |
| Output Clamp Voltage (typ.) | 15 V |
| Undervoltage Lockout | Yes |
| Short-circuit Limit | Yes |
| Overload Current Limit | Yes |
| Controlled Output Voltage Ramp | Yes |
| Thermal Latch (typ.) | 165 °C |
| Operating Junction Temperature | -40 °C to 125 °C |
| Package | DFN10 (3x3 mm) |
| Mounting Style | SMD/SMT |
| RoHS Compliance | Ecopack2 |
Key Features
- Continuous current typ. 3.6 A
- N-channel on-resistance typ. 45 mΩ
- Enable/fault functions
- Output clamp voltage typ. 15 V
- Undervoltage lockout
- Short-circuit limit
- Overload current limit
- Controlled output voltage ramp
- Thermal latch typ. 165 °C
- Uses tiny capacitors
- Operating junction temperature -40 °C to 125 °C
- Available in DFN10 (3x3 mm) package
- UL2367 Recognized - File N. E468771
Applications
- Hard disk drives
- Solid state drives (SSD)
- Hard disk and SSD arrays
- Set-top boxes
- DVD and Blu-ray disc drivers
Q & A
- What is the STEF12EPUR used for? The STEF12EPUR is used as an integrated electronic fuse to protect electronic circuitry from overcurrent and overvoltage conditions in 12 V power rails.
- What are the key features of the STEF12EPUR? Key features include continuous current of 3.6 A, N-channel on-resistance of 45 mΩ, enable/fault functions, output clamp voltage of 15 V, and thermal latch at 165 °C.
- How does the STEF12EPUR handle overload conditions? During an overload condition, the STEF12EPUR limits the output current to a predefined safe value. If the overload persists, it goes into an open state, disconnecting the load from the power supply.
- What is the operating junction temperature range of the STEF12EPUR? The operating junction temperature range is -40 °C to 125 °C.
- What package type is the STEF12EPUR available in? The STEF12EPUR is available in a DFN10 (3x3 mm) package.
- Is the STEF12EPUR RoHS compliant? Yes, the STEF12EPUR is RoHS compliant with an Ecopack2 designation.
- What are some common applications of the STEF12EPUR? Common applications include hard disk drives, solid state drives (SSD), set-top boxes, and DVD and Blu-ray disc drivers.
- How is the thermal protection signalled in the STEF12EPUR? The intervention of the thermal protection is signalled to the board monitoring circuits through a signal on the Fault pin.
- Can the STEF12EPUR be reset after a short-circuit or thermal protection event? Yes, the STEF12EPUR can be reset either by recycling the supply voltage or using the Enable pin.
- What is the advantage of using the STEF12EPUR over mechanical fuses? Unlike mechanical fuses, the STEF12EPUR does not degrade in performance after short-circuit or thermal protection interventions and does not need to be physically replaced.
