Diodes Incorporated STPF1040

Overview

STPF1040 from Diodes Incorporated is a 10A dual-leg super-fast rectifier diode in ITO-220AB package, rated for 400V peak reverse voltage, 5A average current per leg (10A total), 1.3V forward voltage at 5A/25°C, and 35ns reverse recovery time - deployed in high-frequency DC-DC converters and SMPS output stages.

For engineers reviewing the STPF1040 datasheet, STPF1040 pinout, STPF1040 application, or STPF1040 equivalent, key selection criteria include reverse recovery time (t_RR = 35 ns), low leakage (I_R = 10 µA @ 400 V), thermal resistance (R_θJC = 5 °C/W), and ITO-220AB mounting compatibility with aluminum heatsinks.

Technical Context

This dual-common-cathode super-fast rectifier uses glass-passivated silicon die to achieve tight t_RR control (≤35 ns) and stable V_F across temperature (1.20–1.50 V from 25°C to 125°C). Its 400 V V_RRM rating supports off-line and intermediate bus applications.

The device operates over –55°C to +150°C junction range and delivers 10 A total average output current when mounted on a specified 100.64 mm × 75.2 mm × 26.83 mm aluminum heatsink, leveraging its low R_θJC of 5 °C/W for thermal management.

Key Specifications

Pinout & Package

STPF1040 is housed in an ITO-220AB (Type WX) thermally enhanced plastic package with three terminals: two anodes (A1, A2) and one common cathode (K). The case is electrically isolated and serves as a heatsink interface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar super-fast rectifier applications.

Compared with STTH10R04DJF and DF10S04, STPF1040 uniquely combines dual-anode integration, 35 ns t_RR, and 1.3 V V_F in ITO-220AB - delivering superior power density and efficiency in multi-output SMPS and high-frequency DC-DC converters.

Availability

STPF1040 is available at Aetrix Electronics and suitable for switched-mode power supplies, high-frequency DC-DC converters, and LED driver power stages requiring stable component supply, thermal robustness, and RoHS-compliant packaging.

Supply support for STPF1040 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions.

The STP-series super-fast rectifiers are engineered for high-efficiency AC/DC and DC/DC conversion in computing, industrial, and automotive power systems - emphasizing low loss, fast recovery, and thermal resilience.

FAQ

What is the maximum junction temperature for STPF1040?

The STPF1040 has a specified operating junction temperature range of –55°C to +150°C. It achieves this with a thermal resistance of 5 °C/W from junction to case, requiring proper heatsinking to maintain safe operation at full 10 A total current.

Is STPF1040 suitable for automotive applications?

STPF1040 is not AEC-Q101 qualified out-of-the-box, but Diodes offers automotive-grade variants (e.g., STPF1040Q) with PPAP capability and IATF 16949 manufacturing. Standard STPF1040 may be used in non-safety-critical infotainment or body electronics with customer qualification.

How does the dual-anode configuration affect PCB layout?

The dual-anode/common-cathode structure allows independent input routing for two power paths while sharing a single low-inductance cathode return. This reduces loop area and EMI compared to two discrete TO-220 devices, especially in center-tapped or dual-output transformer designs.

What is the surge current rating of STPF1040?

STPF1040 supports a non-repetitive peak forward surge current (I_FSM) of 80 A for an 8.3 ms single half-sine wave at T_A = +25°C. This rating ensures robustness against inrush and transient overloads in power supply startup and fault conditions.