Diodes Incorporated 1N5408G-T

Overview

1N5408G-T from Diodes Incorporated is a glass passivated silicon rectifier diode rated for 3.0A average forward current, 1000V peak repetitive reverse voltage, and 125A non-repetitive surge current, used in AC/DC power supply front-ends, battery chargers, and industrial DC power conversion circuits.

For engineers reviewing the 1N5408G-T datasheet, 1N5408G-T pinout, 1N5408G-T application, or 1N5408G-T equivalent, key selection criteria include its DO-201AD package thermal resistance (16°C/W), low 1.1V forward voltage at 3.0A, 5.0μA max reverse leakage at 25°C, and 2.0μs typical reverse recovery time in high-efficiency linear power supplies.

Technical Context

This device operates as a single-phase, half-wave rectifier under 60Hz resistive or inductive loads, with derating required for capacitive loads (−20% current). Its glass passivated die construction ensures stable junction performance across −65°C to +150°C operating range.

The 1N5408G-T exhibits 40pF typical junction capacitance at 1MHz/4V reverse bias and delivers 3.0A IO only when leads are maintained at ambient temperature at ≥9.5mm from case-critical for PCB layout and heatsinking decisions in offline SMPS and industrial power modules.

Key Specifications

Pinout & Package

Package: DO-201AD molded plastic case (UL 94V-0), cathode indicated by band, matte tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Compared with STTH3L06S and MUR460, the 1N5408G-T provides superior 1000V blocking and 125A surge margin for ruggedized 60Hz line rectification, while trading off speed for cost and thermal robustness in legacy power architectures.

Availability

1N5408G-T is available at Aetrix Electronics and suitable for AC/DC power adapters, industrial DC power supplies, and battery chargers requiring stable component supply and long-lifecycle support.

Supply support for 1N5408G-T 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 and signal integrity solutions.

The 1N5400G–1N5408G series belongs to Diodes' general-purpose rectifier product line, engineered for cost-effective, thermally robust AC/DC conversion in industrial, consumer, and infrastructure power systems.

FAQ

What is the maximum allowable ambient temperature for full 3.0A current operation?

The 1N5408G-T delivers its rated 3.0A average forward current only when leads are maintained at ambient temperature at a distance of ≥9.5mm from the case, and ambient temperature does not exceed +55°C. Above this, current must be derated per Figure 1 in the datasheet.

Can the 1N5408G-T be used in capacitive-input filter designs?

No-capacitive loads require 20% derating of the average forward current due to increased peak currents and thermal stress. For such applications, consult the derated IO curve or select a higher-current-rated device like the 1N5408G-B in bulk packaging for improved thermal margin.

Is the 1N5408G-T suitable for surface-mount assembly?

No-it is a through-hole DO-201AD device with axial leads designed for wave soldering or manual insertion. It lacks SMD-compatible terminations or land patterns; use SMT alternatives like the SB3100 or ES3J only if board space or automation mandates surface mount.

Does the 1N5408G-T meet halogen-free and green material requirements?

Yes-the device complies with Diodes Incorporated's "Green" definition: halogen-free (≤900ppm Cl, ≤900ppm Br, ≤1500ppm total halogens) and antimony-free, as defined on their website and aligned with JEDEC JS709 standards.