Diodes Incorporated SF30HG-B

Overview

SF30HG-B from Diodes Incorporated is a 3.0A, 500V peak repetitive reverse voltage (V_RRM) super-fast glass passivated rectifier diode in DO-201AD package, featuring 35ns reverse recovery time (t_rr), 1.5V forward voltage at 3.0A (V_FM), and 125A non-repetitive surge rating - used in high-frequency AC/DC front-end rectification for switch-mode power supplies.

For engineers reviewing the SF30HG-B datasheet, SF30HG-B pinout, SF30HG-B application, or SF30HG-B equivalent, key selection criteria include V_RRM=500V, t_rr=35ns, I_O=3.0A @ T_A=55°C, low leakage (I_RM=5.0μA @ 25°C), and DO-201AD thermal resistance (R_θJA=32°C/W).

Technical Context

This super-fast rectifier employs a diffused junction and glass passivated die construction to achieve rapid carrier recombination, enabling efficient operation in 20–100 kHz SMPS topologies. Its 35ns reverse recovery time minimizes switching losses during turn-off under inductive loads.

The device supports single-phase, half-wave rectification with 60Hz line frequency and requires derating to 2.4A for capacitive loads. Thermal performance is defined by R_θJA=32°C/W with leads held at ambient at 9.5mm from case per JEDEC standards.

Key Specifications

Pinout & Package

DO-201AD molded plastic package with axial leads, cathode band marking, tin-plated solderable terminals, and UL 94V-0 flammability rating. Weight: 1.12 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06S and ES3J, SF30HG-B offers optimal balance of 500V rating, 35ns speed, 1.5V forward drop, and DO-201AD thermal performance - making it preferred for space-constrained, medium-power SMPS where efficiency and reliability are jointly prioritized.

Availability

SF30HG-B is available at Aetrix Electronics and suitable for AC/DC adapters, LED driver input stages, industrial auxiliary supplies, and automotive aftermarket power modules requiring stable component supply and legacy-design continuity.

Supply support for SF30HG-B 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 industrial, computing, and consumer markets.

SF30HG-B belongs to the SF30xG super-fast rectifier product line, designed specifically for high-efficiency, high-frequency AC/DC conversion in cost- and space-sensitive power supplies where fast recovery and low leakage are essential.

FAQ

Is SF30HG-B RoHS compliant?

Yes, SF30HG-B features a lead-free finish and complies with RoHS Directive 2011/65/EU (Revision 13.2.2003), including exemption for high-temperature soldering per EU Annex Notes 5 and 7. Tin-plated leads meet MIL-STD-202 Method 208 solderability requirements.

What is the maximum operating temperature for SF30HG-B?

SF30HG-B has an operating junction temperature range of –65°C to +150°C. The 3.0A average forward current rating is specified at T_A = 55°C with leads maintained at ambient temperature at 9.5mm from the case per JEDEC test conditions.

Can SF30HG-B replace SF30JG in a design?

No - SF30JG has V_RRM = 600V, while SF30HG-B is rated at 500V. Substitution is only acceptable if the peak reverse voltage in the circuit remains ≤500V with sufficient margin; otherwise, overstress and premature failure may occur.

Does SF30HG-B require a heatsink in typical applications?

No heatsink is required for SF30HG-B at I_O = 3.0A and T_A ≤ 55°C, provided PCB copper area and lead length comply with JEDEC mounting conditions (9.5mm lead length at ambient). R_θJA = 32°C/W enables adequate self-cooling in most through-hole layouts.