Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation SF21G R0G

Name: SF21G R0G
Brand: Taiwan Semiconductor Corporation
SKU: SF21G R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SF21G R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: SF21G R0G.pdf

Description:: DIODE GEN PURP 50V 2A DO204AC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,004

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SF21G R0G from Taiwan Semiconductor is a 2 A, 50 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 2 A, and 50 A surge current capability - deployed in DC-DC converters and freewheeling paths of switching power supplies.

For engineers reviewing the SF21G R0G datasheet, SF21G R0G pinout, SF21G R0G application, or SF21G R0G equivalent, key selection criteria include V_RRM = 50 V, I_F = 2 A, t_rr = 35 ns, thermal resistance R_θJA = 65 °C/W, and AEC-Q101 qualification status (R0G suffix denotes standard grade; H-suffix variants are AEC-Q101 qualified).

Technical Context

This single-die, glass-passivated silicon rectifier operates with low conduction loss due to its 0.95 V V_F at 2 A and 25 °C, enabling high-efficiency operation in high-frequency switching topologies. Its 35 ns t_rr supports clean commutation in SMPS operating up to several hundred kHz.

The device exhibits 5 µA maximum reverse leakage at 25 °C and 100 µA at 125 °C, with junction-to-ambient thermal resistance of 65 °C/W and junction-to-case of 16 °C/W - critical for thermal design in compact, convection-cooled layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - maximum repetitive reverse voltage before breakdown; sets upper limit for input/output voltage rails in buck/boost stages
I_F	2 A continuous - average forward current rating at 75 °C ambient; defines steady-state power handling capacity
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables low switching loss in >200 kHz converters
V_F	0.95 V @ 2 A, 25 °C - low forward drop reduces conduction loss and improves system efficiency
I_FSM	50 A @ 8.3 ms half-sine - withstands inrush and transient overloads without failure
R_θJA	65 °C/W - thermal resistance from junction to ambient; determines temperature rise under given power dissipation

Pinout & Package

DO-204AC (DO-15) axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker test requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter freewheel path)
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to higher-potential rail; blocks reverse voltage up to 50 V

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability and moisture resistance in humid or industrial environments
Low V_F (0.95 V)	Reduces power loss by ~190 mW vs. typical 1.15 V diodes at 2 A, lowering thermal stress
35 ns t_rr	Minimizes reverse recovery charge (Q_rr) and associated switching losses in high-frequency designs
RoHS & halogen-free	Complies with IEC 61249-2-21 and environmental regulations for automotive and industrial PCB assembly

Applications

DC-DC Buck Converter	Switch-Mode Inverter Output Stage
Use Scenario: Freewheeling diode in non-synchronous buck regulator supplying 3.3 V/2 A to FPGA core logic. IC Role / Device Role / Timing Role: Provides low-loss current path during high-side MOSFET off-time; conducts for ~70% duty cycle at 500 kHz. Use Value: 0.95 V V_F limits conduction loss to 1.9 W, while 35 ns t_rr prevents shoot-through-induced ringing and EMI.	Use Scenario: Output rectification in 24 V input, 48 V output isolated flyback converter for PoE++ PSE. IC Role / Device Role / Timing Role: Single-ended rectifier on secondary side; handles 2 A average output current with 50 A surge tolerance during load transients. Use Value: 50 V V_RRM provides 2× safety margin over 24 V input-referred reflected voltage; DO-15 package enables manual rework and through-hole reliability.
Automotive Body Control Module	Industrial PLC Power Supply
Use Scenario: Reverse polarity protection and load dump clamping in 12 V BCM power input stage. IC Role / Device Role / Timing Role: Forward-conducting protection diode; blocks reverse battery connection and absorbs ISO 7637-2 pulse 5a energy. Use Value: 50 A I_FSM withstands 100 ms load dump surges; glass passivation ensures stability across -40 °C to +125 °C ambient.	Use Scenario: Input bridge rectifier in 24 V AC/DC power supply for DIN-rail mounted PLC CPU module. IC Role / Device Role / Timing Role: Half-wave rectifier in discrete linear supply feeding LDOs; operates continuously at 1.5 A average current. Use Value: 65 °C/W R_θJA allows 2.5 W dissipation with <50 °C rise in enclosed chassis; UL 94V-0 molding compound meets industrial fire safety standards.

DC-DC Buck Converter

Switch-Mode Inverter Output Stage

Use Scenario: Freewheeling diode in non-synchronous buck regulator supplying 3.3 V/2 A to FPGA core logic.

IC Role / Device Role / Timing Role: Provides low-loss current path during high-side MOSFET off-time; conducts for ~70% duty cycle at 500 kHz.

Use Value: 0.95 V V_F limits conduction loss to 1.9 W, while 35 ns t_rr prevents shoot-through-induced ringing and EMI.

Use Scenario: Output rectification in 24 V input, 48 V output isolated flyback converter for PoE++ PSE.

IC Role / Device Role / Timing Role: Single-ended rectifier on secondary side; handles 2 A average output current with 50 A surge tolerance during load transients.

Use Value: 50 V V_RRM provides 2× safety margin over 24 V input-referred reflected voltage; DO-15 package enables manual rework and through-hole reliability.

Automotive Body Control Module

Industrial PLC Power Supply

Use Scenario: Reverse polarity protection and load dump clamping in 12 V BCM power input stage.

IC Role / Device Role / Timing Role: Forward-conducting protection diode; blocks reverse battery connection and absorbs ISO 7637-2 pulse 5a energy.

Use Value: 50 A I_FSM withstands 100 ms load dump surges; glass passivation ensures stability across -40 °C to +125 °C ambient.

Use Scenario: Input bridge rectifier in 24 V AC/DC power supply for DIN-rail mounted PLC CPU module.

IC Role / Device Role / Timing Role: Half-wave rectifier in discrete linear supply feeding LDOs; operates continuously at 1.5 A average current.

Use Value: 65 °C/W R_θJA allows 2.5 W dissipation with <50 °C rise in enclosed chassis; UL 94V-0 molding compound meets industrial fire safety standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R06	V_RRM = 600 V, V_F = 1.15 V @ 2 A, t_rr = 35 ns, DO-204AL (DO-41) package	Higher voltage rating but larger footprint and higher V_F; suited for universal-input offline supplies	Select STTH2R06 only if system requires >50 V reverse blocking; not drop-in due to different package and lead spacing
ON Semi MUR220	V_RRM = 200 V, V_F = 0.92 V @ 2 A, t_rr = 35 ns, DO-204AC (DO-15) package	Same mechanical fit and thermal profile, but rated for 200 V - over-spec'd for 50 V use cases	MUR220 offers identical pinout and mounting, but higher cost and unnecessary voltage margin for 50 V systems

Compared with STTH2R06 and MUR220, SF21G R0G delivers optimal balance of 50 V rating, 0.95 V V_F, DO-15 compatibility, and cost efficiency for low-voltage DC-DC and automotive auxiliary power applications - avoiding over-engineering or mechanical incompatibility.

Availability

SF21G R0G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for SF21G R0G 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, specializing in power rectifiers, TVS devices, and MOSFETs since 1979.

The SF2xG series was designed specifically for high-efficiency, high-reliability power conversion in automotive body electronics, industrial SMPS, and consumer power adapters - emphasizing fast recovery, low V_F, and robust thermal performance in legacy through-hole packages.

FAQ

What is the maximum junction temperature rating for SF21G R0G?

The SF21G R0G has a maximum junction temperature (T_J) of +150 °C, with operational range from –55 °C to +150 °C. This rating enables reliable use in under-hood automotive modules and enclosed industrial power supplies where ambient temperatures exceed 85 °C. Derating curves in the SF21G R0G datasheet define safe I_F limits above 75 °C ambient.

Is SF21G R0G AEC-Q101 qualified?

No, SF21G R0G is not AEC-Q101 qualified. The "R0G" suffix indicates standard commercial/industrial grade. AEC-Q101 qualified versions are marked with "H" suffix (e.g., SF21GH). While SF21G R0G shares the same die and construction as qualified variants, only H-suffix parts have undergone full AEC-Q101 stress testing and certification per revision D.

What is the reverse leakage current of SF21G R0G at elevated temperature?

The SF21G R0G exhibits ≤100 µA reverse leakage current (I_R) at rated V_RRM = 50 V and T_J = 125 °C. At 25 °C, I_R is ≤5 µA. This low leakage supports stable operation in high-impedance bias networks and minimizes standby power loss in always-on subsystems.

Can SF21G R0G be used as a direct replacement for 1N4001 in a 50 V circuit?

Yes, SF21G R0G can replace 1N4001 in 50 V circuits, but with significant performance gains: it offers 35 ns t_rr versus 30 µs for 1N4001, enabling use in switching supplies >100 kHz, and 0.95 V V_F versus ~1.1 V - reducing conduction loss by ~15%. Mechanical fit is identical (DO-15), but thermal design must account for higher peak power density.

What is the junction-to-case thermal resistance of SF21G R0G?

The SF21G R0G has a junction-to-case thermal resistance (R_θJC) of 16 °C/W, measured from die to lead termination. This value enables accurate thermal modeling when heatsinking is applied to the leads or when mounted on copper-clad PCBs with thermal vias - critical for predicting junction temperature in high-duty-cycle freewheeling applications.

SF21G R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 2 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 40pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

Operating Temperature - Junction:: -55°C ~ 150°C

SF21G R0G FAQ

1.How can I place an order for SF21G R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF21G R0G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SF21G R0G reliable?

The price and inventory of SF21G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF21G R0G is usually 5 days.

3.What payment methods are accepted for SF21G R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF21G R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF21G R0G?

SF21G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF21G R0G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SF21G R0G?

For technical support, including SF21G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF21G R0G requirements.

6.How does Aetrix verify that SF21G R0G is sourced from the original manufacturer or authorized distributors?

All SF21G R0G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SF21G R0G meets industry standards.

7.What is the process for return or replacement of SF21G R0G?

All SF21G R0G units undergo pre-shipment inspection (PSI). If there is an issue with SF21G R0G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SF21G R0G part is unused and in its original packaging.

Return procedure for SF21G R0G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…