Diodes Incorporated SF30GG-B

Overview

SF30GG-B from Diodes Incorporated is a 400V, 3.0A super-fast glass passivated rectifier diode in DO-201AD package, optimized for high-efficiency AC/DC conversion in offline power supplies and switch-mode power adapters. It delivers 35ns reverse recovery time, 0.95V forward voltage at 3.0A, and withstands 125A non-repetitive surge current, enabling compact, thermally efficient designs in industrial and consumer power stages.

For engineers reviewing the SF30GG-B datasheet, SF30GG-B pinout, SF30GG-B application, or SF30GG-B equivalent, key selection criteria include its 400V VRRM rating, 35ns trr for reduced switching loss, DO-201AD thermal resistance (32°C/W), low IRM (5.0µA @ 25°C), and RoHS-compliant tin-plated leads suitable for lead-free reflow.

Technical Context

This super-fast rectifier employs a diffused junction and glass passivated die construction to achieve tight control of reverse recovery characteristics and low leakage. Its 35ns trr is measured under standardized conditions (IF = 0.5A, IR = 1.0A, Irr = 0.25A), supporting high-frequency operation up to 100kHz in flyback and forward converters.

The device operates across –65°C to +150°C with a thermal resistance of 32°C/W (junction-to-ambient, leads held at ambient at 9.5mm from case). Its 75pF typical capacitance at 1MHz/4V reverse bias minimizes high-frequency noise coupling in EMI-sensitive power stages.

Key Specifications

Pinout & Package

Package: DO-201AD molded plastic case (UL 94V-0), cathode indicated by band, tin-plated leads, 1.12g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L04, SF30GG-B offers identical voltage/current specs but uses a smaller, leaded DO-201AD package with higher RθJA-favoring cost-sensitive, space-constrained designs where thermal margin is acceptable. Versus ES3D, SF30GG-B doubles VRRM for global input compatibility at slightly higher unit cost.

Availability

SF30GG-B is available at Aetrix Electronics and suitable for AC/DC adapter power stages, industrial SMPS input rectification, and LED driver bulk rectification requiring stable component supply and consistent DO-201AD form factor.

Supply support for SF30GG-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.

SF30GG-B belongs to the SF30xG super-fast rectifier product line, designed specifically for high-efficiency, high-frequency AC/DC conversion in cost-sensitive consumer and industrial power supplies.

FAQ

Is SF30GG-B suitable for use in universal-input (90–264VAC) power supplies?

Yes. With a 400V peak repetitive reverse voltage (VRRM), SF30GG-B provides 100V margin above the 373V peak of 264VAC input, satisfying safety standards for universal-input offline SMPS. Its 35ns trr and low VFM ensure efficiency across the full input range without derating.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is +150°C. Under continuous 3.0A DC load at TA = 55°C, junction temperature rises by (3.0A² × 0.95V × 32°C/W) ≈ 274°C - which exceeds limits. Therefore, actual design must limit average current or improve heatsinking; derating curves show 2.0A max at 70°C ambient per Figure 1.

Does SF30GG-B require snubber circuitry in typical 65kHz flyback designs?

Snubbers are not mandatory due to its 35ns trr and low stored charge, but may still be needed depending on transformer leakage inductance and layout parasitics. Measured ringing amplitude and EMI test results should guide snubber inclusion; many reference designs omit snubbers when using SF30GG-B with optimized PCB routing.

Can SF30GG-B replace SF30DG-B in an existing design?

Yes, with voltage derating consideration. SF30DG-B has 200V VRRM versus SF30GG-B's 400V, so replacement is safe electrically but increases blocking margin. No changes to footprint, thermal design, or drive circuitry are needed - both share DO-201AD package, 3.0A rating, and identical pinout and soldering profile.