Diodes Incorporated STPR2040CTW

Overview

STPR2040CTW from Diodes Incorporated is a superfast glass passivated rectifier diode in TO-220AB package, rated for 400 V repetitive peak reverse voltage and 20 A average forward current at TC = 100°C, with 35 ns reverse recovery time and 1.02 V forward voltage at 20 A/25°C - used in high-frequency DC-DC converters and switching-mode power supplies.

For engineers reviewing the STPR2040CTW datasheet, STPR2040CTW pinout, STPR2040CTW application, or STPR2040CTW equivalent, key selection criteria include reverse recovery time (35 ns), thermal resistance (2 °C/W junction-to-case), forward voltage at full load (1.02 V @ 20 A), surge rating (125 A @ 8.3 ms), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This dual-die common-cathode fast rectifier integrates two independent 400 V / 20 A diodes sharing one cathode terminal, enabling full-wave bridge configurations with reduced component count. Its superfast recovery (Trr ≤ 35 ns) minimizes switching losses in high-frequency topologies above 100 kHz.

The device uses glass passivation for stable surface protection and operates across –55 °C to +150 °C junction temperature range. Thermal resistance of 2 °C/W (junction-to-case) supports direct mounting to heatsinks for sustained 20 A conduction under controlled thermal conditions.

Key Specifications

Pinout & Package

Package: JEDEC TO-220AB, 3-terminal, common-cathode dual diode configuration. Molded "Green" compound (UL 94V-0), lead-free, halogen- and antimony-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2004D and MBR2040CT, STPR2040CTW uniquely combines 400 V rating, AEC-Q101 qualification, and integrated common-cathode topology - making it optimal for automotive and industrial 48–400 V rectification where reliability, layout simplicity, and thermal performance are jointly critical.

Availability

STPR2040CTW is available at Aetrix Electronics and suitable for switching-mode power supplies, high-frequency DC-DC converters, and automotive power conversion systems requiring stable component supply and long-term lifecycle support.

Supply support for STPR2040CTW 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-efficiency power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.

STPR2040CTW belongs to Diodes' Superfast Rectifier product line, engineered for high-frequency switching power conversion where low recovery loss and robust surge capability are essential in harsh thermal and electrical environments.

FAQ

What is the maximum junction temperature for continuous operation?

The STPR2040CTW has a specified operating junction temperature range of –55 °C to +150 °C. For reliable continuous operation at 20 A average current, the case temperature must be maintained at or below 100 °C, requiring thermal design that limits junction-to-case rise to ≤50 °C (using RthJC = 2 °C/W). Derating curves confirm 20 A is sustainable only up to TC = 100 °C.

Is STPR2040CTW suitable for use in a full-wave bridge configuration?

Yes - STPR2040CTW is a dual-anode, common-cathode rectifier specifically designed for full-wave rectification without external interconnects. Pins 1 and 3 serve as independent anodes, while Pin 2 is the shared cathode output. This eliminates the need for external cathode tying and reduces PCB trace inductance compared to discrete diode solutions.

Does this part require a heatsink in 20 A applications?

Yes - at 20 A average forward current, the power dissipation exceeds 20 W (based on VF ≈ 1.02–1.4 V), necessitating active or passive heatsinking. The 2 °C/W RthJC rating assumes mounting on a 100 mm × 100 mm × 1.9 mm copper pad; smaller pads or ambient temperatures >50 °C require additional heatsink area or forced airflow to maintain TJ ≤ 150 °C.

How does AEC-Q101 qualification impact board-level reliability?

AEC-Q101 qualification means STPR2040CTW has passed stress tests including HTGB, HTRB, TCT, and UHAST - verifying robustness against high-temperature gate bias, humidity, thermal cycling, and unbiased HAST. This ensures stable parametric performance and no latent failures after 1,000+ hours of operation in automotive under-hood environments (–40 °C to +125 °C ambient).