Product overview
Description
The STEF12S is an integrated electronic fuse optimized to monitor the 12 V DC power lines.
When connected in series to the main power rail, it is able to precisely detect and react to overcurrent and overvoltage conditions.
When an overload condition occurs, the device limits the output current to a safe value defined by the user. If the anomalous overload condition persists, the device goes into an open state, disconnecting the load from the power supply.
In case of overvoltage on the input, the device regulates the output to a preset safe value.
Undervoltage lockout prevents the load from malfunction, keeping the device off if the rail voltage is too low.
The STEF12S features the adjustable turn-on slew-rate, which is useful to keep the in-rush current under control during startup and hot-swap operations.
On the DFN10 package a dedicated pin provides a gate control for an external optional N-channel Power FET, used to implement the reverse current blocking in case of input voltage loss.
The STEF05S is a companion chip for the 5 V rails, useful to implement a complete power rail control in data-storage applications.
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All features
- 15 V typical output overvoltage clamp
- Absolute maximum voltage of 25 V
- Adjustable current limit
- Thermal protection
- Input undervoltage lockout
- Low inrush current during startup
- Integrated 40 mΩ Power FET
- En/fault pin
- Adjustable slew rate for output voltage
- Gate control pin for reverse current blocking FET (DFN10 package)
- TSOT23-8L and DFN10 (3x3 mm) packages
- Latch (STEF12S) or autoretry (STEF12SA) versions
- UL2367 Recognized - File N. E468771
- IEC 62368-1 CB certified
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STMicroelectronics - STEF12S
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| STEF12SAGR | Active | TSOT 8L | Industrial | Ecopack2 | |
| STEF12SAPUR | Active | DFN10 3X3 | Industrial | Ecopack2 | |
| STEF12SGR | Active | TSOT 8L | Industrial | Ecopack2 | |
| STEF12SPUR | Active | DFN10 3X3 | Industrial | Ecopack2 | |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| STEF12SPUR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STEF12SAPUR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STEF12SGR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STEF12SAGR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
STEF12SPUR Active
STEF12SAPUR Active
STEF12SGR Active
STEF12SAGR Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors