Taiwan Semiconductor Corporation SF27G-T

Overview

SF27G-T from Taiwan Semiconductor is a 2 A, 500 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 35 ns reverse recovery time, 1.70 V forward voltage at 2 A and 25°C, and 5 µA reverse leakage at rated VR and 25°C - used in high-frequency switching mode power supplies for freewheeling and output rectification.

For engineers reviewing the SF27G-T datasheet, SF27G-T pinout, SF27G-T application, or SF27G-T equivalent, key selection criteria include its 500 V V_RRM, 50 A I_FSM, 150°C maximum junction temperature, low 20 pF junction capacitance at 1 MHz/4 V, and thermal resistance of 65°C/W (junction-to-ambient).

Technical Context

The SF27G-T implements a single-die, glass-passivated PN junction optimized for high-speed switching with minimal stored charge. Its 35 ns trr and 20 pF C_J enable efficient operation in DC–DC converters operating above 100 kHz.

Designed for unidirectional conduction, it supports repetitive peak reverse voltages up to 500 V and handles surge currents up to 50 A (8.3 ms half-sine), with thermal performance defined by R_θJA = 65°C/W and R_θJC = 16°C/W under standard mounting conditions.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial leaded, glass-passivated, RoHS-compliant, halogen-free molding compound (UL 94V-0), pure tin-plated leads, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06 and ES2D, the SF27G-T uniquely balances 500 V blocking, 1.70 V forward drop, and 35 ns recovery in a standard DO-15 footprint - making it optimal for 375 VDC bus applications like telecom PSUs and industrial 24/48 V systems requiring precise voltage margin control.

Availability

SF27G-T is available at Aetrix Electronics and suitable for DC–DC converters, switching mode power supplies, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for SF27G-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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.

The SF2xG-T series was developed specifically for high-efficiency, high-reliability AC–DC and DC–DC power conversion, emphasizing fast recovery, low leakage, and robust surge capability in standard axial packages.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF27G-T?

The SF27G-T has a maximum repetitive peak reverse voltage (V_RRM) of 500 V, verified per Taiwan Semiconductor's C2105 datasheet revision. This rating defines the highest reverse voltage the device can block repeatedly without avalanche breakdown under normal operating conditions. The SF27G-T is part of the SF21G-T to SF28G-T family, where "27" corresponds to the 500 V grade. It must not be operated beyond this limit in continuous or repetitive modes.

What is the forward voltage (V_F) of SF27G-T at 2 A and 25°C?

The forward voltage (V_F) of SF27G-T is 1.70 V at 2 A forward current and 25°C junction temperature, as specified in the Electrical Specifications table of the official datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At elevated temperatures (e.g., 125°C), V_F decreases slightly due to semiconductor physics, but system design should use the 25°C value for worst-case conduction loss calculation.

Does SF27G-T have a specified reverse recovery time (t_rr)?

Yes, SF27G-T has a specified reverse recovery time (t_rr) of 35 ns, tested at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is critical for high-frequency switching applications such as 100–500 kHz SMPS, where shorter t_rr reduces switching losses and EMI generation. The value is consistent across the SF25G-T through SF28G-T variants and reflects the super fast recovery design of the die.

What package type does SF27G-T use, and what are its mechanical features?

SF27G-T uses the DO-204AC (DO-15) axial package, with pure tin-plated leads compliant with J-STD-002 solderability standards and passing JESD 201 Class 1A whisker testing. The molding compound meets UL 94V-0 flammability rating, and polarity is marked by a cathode band. Its weight is approximately 0.400 g. This standardized through-hole package enables compatibility with legacy wave-solder and hand-solder assembly processes.

Is SF27G-T RoHS and halogen-free compliant?

Yes, SF27G-T is RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as confirmed in the Features section of the Taiwan Semiconductor datasheet (Version C2105). The device uses a green compound molding material and contains no brominated flame retardants or chlorine-based additives, satisfying environmental requirements for industrial, medical, and consumer electronics sold in EU, Japan, and North America.