STMicroelectronics STEF12H60MPUR

Overview

STEF12H60MPUR from STMicroelectronics is a 60 A integrated electronic fuse (eFuse) for 12 V DC power rails, featuring an internal 0.85 mΩ N-channel Power MOSFET, programmable current limit via CLREF pin (0.2–1.4 V), adjustable soft-start (10–100 ms), and precise current monitoring (±3% accuracy at 10–60 A). It operates across –40°C to +125°C and is used in server main eFuse protection.

For engineers reviewing the STEF12H60MPUR datasheet, STEF12H60MPUR pinout, STEF12H60MPUR application, or STEF12H60MPUR equivalent, this device delivers accurate overcurrent response (100 µs), thermal fault detection (130–150°C shutdown), dual-mode fault management (latch-off or auto-retry), parallel operation support, and integrated diagnostics including gate-drain short detection and self-test during startup.

Technical Context

The STEF12H60MPUR implements a closed-loop current-limiting architecture using a replica-MOSFET current sense circuit (ACS = 10 µA/A) and a voltage-comparator-based CLREF threshold interface. Its soft-start control uses a constant-current-charged external capacitor (ISS = 5.2 µA typical) to generate monotonic VOUT ramp-up, with foldback current limiting active below 40% VIN and stepped limits up to 80% VIN.

Thermal protection integrates a calibrated on-die temperature sensor (450 mV at 25°C, 10 mV/°C coefficient) feeding a comparator with 130–150°C shutdown threshold. Fault status is reported via open-drain GOK (gate-OK) and D_OC (overcurrent) outputs, both 5 V compliant, with 1 µs D_OC response time and 250 µs shutdown timer after current limit activation.

Key Specifications

Pinout & Package

STEF12H60MPUR is housed in a thermally optimized QFN32 (5 mm × 5 mm, 0.5 mm pitch) package with an exposed thermal pad connected internally to VIN. The package supports high-current routing via eight VIN and eight VOUT pins, and includes dedicated analog sensing (IMON, VTEMP, CS, CLREF), control (ON/PD, SS), and status (GOK, D_OC) terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar electronic fuse applications.

Compared with TPS25982LMLR and RTQ2131BGQW, STEF12H60MPUR uniquely combines integrated 0.85 mΩ FET, programmable soft-start, startup foldback, parallel current balancing, and full self-diagnostics-making it optimal for high-reliability, high-current 12 V infrastructure where layout simplicity and fault visibility are critical.

Availability

STEF12H60MPUR is available at Aetrix Electronics and suitable for server main eFuse, hot-swap board protection, and high-power industrial 12 V rail protection requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STEF12H60MPUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, automotive ICs, and industrial microcontrollers with over 45 years of analog/mixed-signal design heritage.

The STEF12H60MPUR belongs to ST's eFuse portfolio designed specifically for high-current, high-reliability DC power rail protection in datacenter, telecom, and industrial systems-emphasizing integration, diagnostics, and thermal robustness over discrete alternatives.

FAQ

What is the difference between STEF12H60MPUR and STEF12H60MAPUR?

STEF12H60MPUR is the latch-off version: after thermal or overcurrent shutdown, it remains off until power cycle or VDD UVLO reset. STEF12H60MAPUR is the auto-retry variant with 1 s fixed restart delay after fault clearance. Both share identical pinout, electrical specs, and package; only fault recovery behavior differs. Selection depends on system-level fault policy-latch-off for safety-critical isolation, auto-retry for high-availability redundancy.

How is current limit set and verified in-circuit?

Current limit is set by applying a voltage (0.2–1.4 V) to CLREF; the resulting I_LIM = V_CLREF / (R_CS × 10 µA/A). For example, 1.0 V with 2.2 kΩ RCS yields ~45.5 A. Verification is done by measuring IMON voltage across R_MON: V_IMON = I_OUT × R_MON × 10 µA/A. At 60 A and R_MON = 100 Ω, expect 60 mV ±1.8 mV (±3%).

Can STEF12H60MPUR operate with 5 V input?

Yes-STEF12H60MPUR supports 5–18 V input per datasheet Table 4. However, at 5 V, the 0.85 mΩ R_DS(on) causes only ~51 mV drop at 60 A, preserving regulation margin. Critical constraints include: VINF must be ≥5.5 V (via LDO), so external RC filter from VIN to VINF must ensure ≥5.5 V at VINF even at 5 V VIN-requiring careful LDO bias design or auxiliary supply.

What layout practices minimize thermal resistance?

To achieve R_θJA = 26°C/W, use ≥4 thermal vias (0.3 mm diameter, 0.6 mm pitch) under the exposed pad, connect to inner-layer copper pour ≥100 mm², and avoid solder mask over thermal pads. Route all eight VIN and eight VOUT pins with ≥0.5 mm trace width and 2 oz copper. Keep IMON, VTEMP, and CLREF traces short and away from switching nodes to preserve analog accuracy.