Diodes Incorporated PDU420-13

Overview

PDU420-13 from Diodes Incorporated is an ultra-fast recovery rectifier diode in PowerDI®5 package, rated for 200 V peak repetitive reverse voltage and 4 A average forward current, with 25 ns reverse recovery time and 0.875 V forward voltage at 3 A/25°C. It serves as a primary output rectifier in low-voltage, high-frequency DC/DC converters and flyback power supplies.

For engineers reviewing the PDU420-13 datasheet, PDU420-13 pinout, PDU420-13 application, or PDU420-13 equivalent, key selection criteria include ultra-fast trr (25 ns), thermal resistance to solder point (3.0 °C/W), AEC-Q101 qualification, RoHS-compliant "green" molding compound, and PowerDI®5 footprint compatibility with FR-4 and polyimide PCBs.

Technical Context

This device employs glass-passivated die construction to ensure stable reverse breakdown and low leakage across -65°C to +175°C junction temperature range. Its ultra-fast recovery enables efficient operation in switching frequencies up to several hundred kHz without significant switching loss penalties.

The PowerDI®5 package integrates bottom-side thermal pad contact for direct PCB heat sinking, supporting three distinct R_θJA values (85 °C/W on FR-4, 60 °C/W on polyimide, 40 °C/W with optimized cathode pad layout), enabling design flexibility across cost- and performance-tiered applications.

Key Specifications

Pinout & Package

PowerDI®5 is a surface-mount, thermally enhanced package with exposed cathode pad on the bottom side and anode terminal on the right edge. The case uses UL 94V-0 "green" molding compound and matte tin-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4L06S and SB420-E3/54, PDU420-13 delivers superior thermal performance (R_θJS = 3.0 °C/W), faster recovery (25 ns), and smaller footprint-making it optimal for space-constrained, high-efficiency 12–48 V power conversion where thermal management and switching loss are critical.

Availability

PDU420-13 is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS secondary rectification, and USB-C PD fast charging adapters requiring stable component supply, AEC-Q101 compliance, and consistent thermal performance across production volumes.

Supply support for PDU420-13 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 solutions for automotive, industrial, and consumer markets.

The PowerDI® rectifier product line targets high-efficiency, thermally demanding power conversion applications-designed specifically to replace legacy SMA/SMB/SOT-223 devices with enhanced thermal dissipation and AEC-Q101 qualification.

FAQ

What is the maximum allowable PCB copper area for optimal thermal performance of PDU420-13?

The datasheet specifies a cathode pad dimension of 9.4 mm × 7.2 mm for achieving R_θJA = 40 °C/W. This area must be solid copper, directly connected to internal ground/power planes via ≥4 thermal vias (0.3 mm diameter, spaced ≤2 mm apart). Smaller pads increase thermal resistance proportionally-e.g., halving the area raises R_θJA by ~25%.

Can PDU420-13 be used in capacitive-input filter applications without derating?

No. The datasheet explicitly states that for capacitive loads, the average forward current must be derated by 20%. At 25°C ambient, this reduces usable I_O from 4 A to 3.2 A. Derating is required because capacitive input causes high peak currents and increased RMS heating not captured by DC-rated current specifications.

Is PDU420-13 pin-compatible with other PowerDI®5 rectifiers like PDU340?

Yes-PDU420-13 shares identical PowerDI®5 mechanical dimensions, pad layout, and terminal configuration with PDU340 and PDU520. However, electrical parameters differ: PDU340 has 400 V V_RRM, while PDU520 offers 5 A I_O. Pinout compatibility enables drop-in substitution only when voltage/current ratings align with design requirements.

Does PDU420-13 require special reflow profile considerations due to its thermal pad?

Yes. The exposed cathode pad demands extended time above liquidus (≥60 seconds at >217°C) and peak temperature of 245 ±5°C to ensure void-free solder joint formation. Use nitrogen atmosphere or high-activity no-clean flux; insufficient thermal mass or ramp rate causes cold joints and elevated R_θJA-verified per J-STD-020C Level 1 moisture sensitivity handling.