Diodes Incorporated SR306-T

Overview

SR306-T from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD axial package, rated for 60 V DC blocking voltage, 3.0 A average forward current at 95°C lead temperature, and 80 A non-repetitive surge current (8.3 ms half-sine). It delivers low forward voltage drop (0.72 V @ 3.0 A) and low thermal resistance (20 °C/W), enabling efficient power conversion in offline AC/DC front-end and DC-DC secondary-side rectification.

For engineers reviewing the SR306-T datasheet, SR306-T pinout, SR306-T application, or SR306-T equivalent, key selection criteria include its 60 V VRRM rating, 0.72 V VF at 3.0 A, 80 A IFSM surge capability, DO-201AD mechanical compatibility, and thermal performance under sustained conduction in compact power supplies.

Technical Context

This Schottky rectifier uses a guard-ringed die structure to enhance transient voltage robustness while maintaining low forward conduction loss. Its 300 pF typical junction capacitance and 20 °C/W junction-to-ambient thermal resistance are optimized for high-frequency switching applications up to 1 MHz with minimal reverse recovery penalty.

The device operates across –65°C to +150°C junction temperature range and exhibits 1.0 mA peak reverse current at 25°C and 20 mA at 100°C under rated DC blocking voltage - critical for thermal stability in unregulated or high-ambient environments.

Key Specifications

Pinout & Package

DO-201AD axial-leaded plastic package (UL 94V-0 rated); cathode identified by band; leads solderable per MIL-STD-202, Method 208; weight ≈1.2 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SR306-T, SB360-T offers lower forward loss and updated process technology, while SS36-E3/57T trades axial through-hole convenience for superior thermal management and SMT scalability - both retain 60 V blocking and 3 A rating but differ in form factor and efficiency envelope.

Availability

SR306-T is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC converter output stages, and LED driver constant-current paths requiring stable component supply and proven legacy reliability.

Supply support for SR306-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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The SR302–SR306 series belongs to Diodes' high-current Schottky rectifier product line, engineered for cost-effective, thermally robust rectification in legacy and maintenance-focused power supply designs where axial-leaded DO-201AD compatibility is required.

FAQ

Is SR306-T suitable for new designs?

No - the datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, USE SB3X0 SERIES". SR306-T remains viable for repair, replacement, or legacy BOM continuity, but Diodes Incorporated positions the SB3x0 family (e.g., SB360-T) as the preferred solution for new projects due to improved VF, reliability, and long-term supply assurance.

What is the maximum allowable junction temperature for SR306-T?

The absolute maximum junction temperature is +150°C, with storage temperature matching this range (–65°C to +150°C). Operation at TJ > 125°C requires derating IO below 3.0 A per the forward current derating curve (Fig. 1), and thermal design must ensure RJA × PD does not exceed the margin to 150°C under worst-case ambient and power dissipation.

Can SR306-T replace a 1N5408 in a 3 A power supply?

Yes, with critical caveats: SR306-T offers lower VF (0.72 V vs. ~1.1 V for 1N5408), reducing conduction loss and heat, but its 60 V VRRM is lower than 1N5408's 1000 V rating. It is only suitable where reverse voltage stress stays ≤60 V - e.g., secondary-side rectification - not primary-side or high-voltage DC links.

Does SR306-T have a specified reverse recovery time (trr)?

No - as a Schottky barrier rectifier, SR306-T has no minority-carrier storage and therefore no defined reverse recovery time. Its switching behavior is governed by junction capacitance (300 pF) and series resistance, enabling clean turn-off with negligible reverse recovery loss - a key advantage over PN-junction rectifiers in high-frequency applications.