Diodes Incorporated SF20DG-T

Overview

SF20DG-T from Diodes Incorporated is a 2.0A, 200V peak repetitive reverse voltage super-fast glass passivated rectifier diode in DO-15 package, with 35ns reverse recovery time, 0.95V forward voltage at 2.0A, and 10µA reverse leakage at 25°C - used in high-frequency switch-mode power supplies and AC/DC adapters.

For engineers reviewing the SF20DG-T datasheet, SF20DG-T pinout, SF20DG-T application, or SF20DG-T equivalent, key selection criteria include VRRM=200V, trr=35ns, VFM=0.95V@2A, IRM=10µA@25°C, and DO-15 thermal resistance of 40°C/W for thermal design validation.

Technical Context

This super-fast rectifier employs glass passivated die construction to achieve low reverse leakage and stable switching performance under high dv/dt conditions. Its 35ns reverse recovery time and 75pF junction capacitance support operation in 100kHz–500kHz SMPS topologies without excessive switching loss.

The device operates across –65°C to +150°C junction temperature range and sustains 60A non-repetitive surge current (8.3ms half-sine), enabling robustness against line transients in offline power stages where fast recovery and low conduction loss are jointly required.

Key Specifications

Pinout & Package

DO-15 axial-leaded plastic package with cathode band marking; lead finish is matte tin, solderable per MIL-STD-202 Method 208. Weight: 0.35 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R02DJF and MUR220G, SF20DG-T offers optimal balance of low VFM (0.95V), proven DO-15 thermal performance (RθJA = 40°C/W), and industry-standard cathode-band polarity - making it preferred for cost-sensitive, thermally demanding AC/DC front ends.

Availability

SF20DG-T is available at Aetrix Electronics and suitable for AC/DC adapters, offline switch-mode power supplies, and industrial motor drive snubbers requiring stable component supply and long-lifecycle support despite its obsolete status.

Supply support for SF20DG-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the US.

SF20DG-T belongs to the SF20xG super-fast rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC conversion in consumer and industrial power supplies where fast recovery and low leakage are mandatory.

FAQ

Is SF20DG-T still in active production?

No - SF20DG-T is officially obsolete per Diodes Incorporated's DS24013 Rev. 4 (February 2015). It is no longer manufactured, but Aetrix Electronics maintains legacy inventory and provides traceable, tested stock for ongoing production and repair programs.

What is the maximum allowable ambient temperature for 2.0A continuous operation?

Per datasheet Fig. 1, SF20DG-T supports 2.0A average forward current only up to 75°C ambient temperature. At 100°C ambient, derated current drops to ~1.3A due to thermal limitations imposed by RθJA = 40°C/W and Tj(max) = 150°C.

Can SF20DG-T replace SF20AG-T in a 50V design?

Yes - SF20DG-T (200V VRRM) exceeds the 50V requirement of SF20AG-T and shares identical DO-15 package, pinout, and thermal characteristics. However, its higher VRRM correlates with slightly higher VFM (0.95V vs. 0.85V for SF20AG-T), increasing conduction loss by ~12% at 2A.

Does SF20DG-T require a heatsink in typical 2.0A applications?

No - with RθJA = 40°C/W and Tj(max) = 150°C, SF20DG-T operates safely at 2.0A and 75°C ambient without a heatsink, provided PCB copper area meets datasheet lead-mounting condition (leads held at ambient at 9.5mm from case).