Diodes Incorporated STPR1040CTW

Overview

STPR1040CTW from Diodes Incorporated is a superfast glass passivated dual common-cathode rectifier diode rated for 400 V repetitive peak reverse voltage and 10 A average forward current per leg, with 35 ns reverse recovery time and 1.50 V forward voltage at 10 A/25°C - used in high-frequency AC-DC front-end rectification for industrial power supplies.

For engineers reviewing the STPR1040CTW datasheet, STPR1040CTW pinout, STPR1040CTW application, or STPR1040CTW equivalent, key selection criteria include reverse recovery time under switching stress, thermal resistance (R_ΘJC = 4.2 °C/W), AEC-Q101 qualification for automotive-grade reliability, and TO-220AB package mounting torque specification (0.5 N·m).

Technical Context

This dual common-cathode rectifier integrates two independent superfast diode chips in a single TO-220AB thermally optimized plastic package, enabling interleaved or parallel rectification topologies. Its 35 ns trr and low Q_rr support operation up to 100 kHz in PFC and SMPS stages without excessive switching loss.

The device operates across –55°C to +150°C junction temperature range with 10 µA max reverse leakage at 400 V/25°C and 250 µA at 100°C, ensuring stable performance in thermally demanding environments such as engine bay-mounted DC-DC converters.

Key Specifications

Pinout & Package

TO-220AB package with three leads: Pin 1 (Anode 1), Pin 2 (Cathode, common), Pin 3 (Anode 2). Mounting tab is electrically connected to cathode (Pin 2) and serves as primary thermal path to heatsink. Maximum mounting torque: 0.5 N·m.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar superfast dual common-cathode rectifier applications.

Compared with STPR1040CTW, STTH10R06DJF trades 200 V higher blocking voltage and faster recovery for increased conduction loss, while ES1J-M3/84A fails to meet core requirements of dual-leg topology and 10 A current handling - making STPR1040CTW uniquely balanced for 400 V/10 A industrial rectification.

Availability

STPR1040CTW is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, automotive on-board chargers, solar microinverters, and server PSU front-end rectification requiring stable component supply and AEC-Q101-compliant reliability.

Supply support for STPR1040CTW 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-reliability power management, signal integrity, and protection devices for industrial, automotive, and computing markets.

The STPR series targets high-efficiency AC-DC conversion in thermally constrained environments, emphasizing superfast recovery, AEC-Q101 qualification, and robust thermal design for mission-critical power front-ends.

FAQ

Is STPR1040CTW suitable for synchronous rectification topologies?

No - STPR1040CTW is a passive superfast rectifier diode, not a MOSFET-based synchronous rectifier. It lacks gate control terminals and cannot be actively switched. Its 35 ns t_rr makes it appropriate for high-frequency hard-switched PFC and flyback stages, but synchronous rectification requires externally driven FETs with precise timing control.

What is the maximum recommended heatsink temperature for continuous 10 A operation?

Per FIG.1 in DS44288, the average forward current derates linearly from 10 A at 25°C case temperature to 0 A at 175°C. For continuous 10 A operation, case temperature must remain ≤75°C. With R_ΘJC = 4.2 °C/W and 15 W dissipation per leg, heatsink temperature must stay ≤60°C to maintain safe junction margin below 150°C.

Does the TO-220AB package require electrical isolation when mounted to a grounded heatsink?

Yes - Pin 2 (common cathode) is internally connected to the metal mounting tab. If the heatsink is grounded, the cathode node becomes earth-referenced. To avoid shorting the AC input phases to ground, an electrically isolating pad (e.g., mica or polymer film) with thermal conductivity ≥1.0 W/m·K must be used between tab and heatsink.

How does AEC-Q101 qualification impact STPR1040CTW's use in non-automotive applications?

AEC-Q101 qualification subjects STPR1040CTW to accelerated stress tests including temperature cycling, humidity bias, and ESD (8 kV HBM), resulting in higher intrinsic reliability and longer field lifetime. This benefits industrial and telecom applications where extended service intervals, unattended operation, and harsh environmental exposure are critical - even outside automotive contexts.