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

Taiwan Semiconductor Corporation SF31G R0G

Name: SF31G R0G
Brand: Taiwan Semiconductor Corporation
SKU: SF31G R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF31G R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF31G R0G.pdf

Description:: DIODE GEN PURP 50V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:2,100

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Product details

Overview

SF31G R0G from Taiwan Semiconductor is a 3A, 50V super fast recovery rectifier diode in DO-201AD package, featuring 0.95V forward voltage at 3A/25°C, 35ns reverse recovery time, and 125A surge current capability; used in DC-DC converters and switching-mode power supplies for high-efficiency freewheeling.

For engineers reviewing the SF31G R0G datasheet, SF31G R0G pinout, SF31G R0G application, or SF31G R0G equivalent, key selection criteria include V_RRM = 50V, I_F = 3A, t_rr = 35ns, thermal resistance R_θJL = 10°C/W, and AEC-Q101 qualification status (R0G suffix indicates standard grade, not AEC-Q101).

Technical Context

The SF31G R0G implements a single-die silicon PN junction structure optimized for fast switching in high-frequency power conversion. Its 35ns reverse recovery time and low 0.95V forward voltage at rated current enable reduced conduction and switching losses in 50–100 kHz SMPS topologies.

Thermal performance is defined by R_θJL = 10°C/W and R_θJA = 35°C/W, supporting continuous 3A operation with appropriate PCB copper area. The DO-201AD package uses pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse blocking voltage; sets upper limit for input/output voltage rails in buck, flyback, or freewheeling paths
I_F	3 A - Continuous average forward current; defines steady-state power handling without derating at T_A ≤ 75°C
t_rr	35 ns - Reverse recovery time at I_F = 0.5A, I_R = 1.0A; enables stable operation up to ~500 kHz switching frequency
V_F	0.95 V @ 3A, 25°C - Forward voltage drop; determines conduction loss of 2.85W at full load, critical for thermal design
I_FSM	125 A - Non-repetitive surge current (8.3ms half-sine); withstands inrush and fault transients in industrial power supplies
R_θJL	10 °C/W - Junction-to-lead thermal resistance; allows direct thermal path to PCB copper or heatsink via lead frame
Junction Temp	−55°C to +150°C - Operating temperature range; supports under-hood automotive auxiliary supplies and industrial ambient conditions

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Weight ≈1.10g.

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, transformer secondary center-tap)
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail or filter capacitor; polarity must be observed to prevent catastrophic failure

Key Features

Feature	Design Value
Super fast recovery (t_rr = 35 ns)	Enables high-frequency switching (>200 kHz) with minimal switching loss and EMI generation
Low forward voltage (V_F = 0.95 V @ 3A)	Reduces conduction loss by ~15% vs. standard FRDs with V_F ≥ 1.1V, improving efficiency in 12V–48V systems
High surge rating (I_FSM = 125 A)	Survives cold-start inrush and short-circuit events without bond wire fusing in 3A-rated power stages
DO-201AD mechanical robustness	UL 94V-0 molding compound and 1.10g mass provide mechanical stability in vibration-prone industrial environments
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and global environmental regulations for automotive and industrial end equipment

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated 24V–48V input DC-DC converters delivering 3A to FPGA or microcontroller power rails. IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC; timing role defined by switching frequency and t_rr-limited turn-off edge. Use Value: 35ns t_rr minimizes reverse recovery charge (Q_rr), reducing MOSFET turn-on loss and enabling >300 kHz operation without excessive heating.	Use Scenario: Freewheeling path across inductive loads (e.g., motor windings, solenoids) in half-bridge inverters operating at 20–100 kHz. IC Role / Device Role / Timing Role: Passive clamp diode providing low-impedance return path during switch off-time; timing role governed by t_rr and stored carrier lifetime. Use Value: 0.95V V_F limits freewheeling conduction loss to <3W, preventing thermal runaway during sustained 100% duty-cycle braking.
AC-DC Adapter Secondary Rectification	Industrial Power Supply Snubber Network
Use Scenario: Output rectification in compact 5V/3A wall adapters using quasi-resonant flyback topology. IC Role / Device Role / Timing Role: High-speed unidirectional conductor synchronizing with primary-side MOSFET switching edges; t_rr directly impacts valley-switching accuracy. Use Value: Low 35ns t_rr ensures clean zero-current switching transitions, improving efficiency by 0.8–1.2% over standard 100ns FRDs.	Use Scenario: Clamp diode in RCD snubber networks protecting IGBTs in 3-phase 400V industrial drives. IC Role / Device Role / Timing Role: Fast-turn-on clamping element absorbing inductive energy spikes; role defined by V_RRM margin and t_rr-driven voltage overshoot control. Use Value: 50V V_RRM provides 2× margin over 24V bus clamping targets, while 35ns t_rr limits peak clamp voltage to <65V during 1µs dV/dt events.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated 24V–48V input DC-DC converters delivering 3A to FPGA or microcontroller power rails.

IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC; timing role defined by switching frequency and t_rr-limited turn-off edge.

Use Value: 35ns t_rr minimizes reverse recovery charge (Q_rr), reducing MOSFET turn-on loss and enabling >300 kHz operation without excessive heating.

Use Scenario: Freewheeling path across inductive loads (e.g., motor windings, solenoids) in half-bridge inverters operating at 20–100 kHz.

IC Role / Device Role / Timing Role: Passive clamp diode providing low-impedance return path during switch off-time; timing role governed by t_rr and stored carrier lifetime.

Use Value: 0.95V V_F limits freewheeling conduction loss to <3W, preventing thermal runaway during sustained 100% duty-cycle braking.

AC-DC Adapter Secondary Rectification

Industrial Power Supply Snubber Network

Use Scenario: Output rectification in compact 5V/3A wall adapters using quasi-resonant flyback topology.

IC Role / Device Role / Timing Role: High-speed unidirectional conductor synchronizing with primary-side MOSFET switching edges; t_rr directly impacts valley-switching accuracy.

Use Value: Low 35ns t_rr ensures clean zero-current switching transitions, improving efficiency by 0.8–1.2% over standard 100ns FRDs.

Use Scenario: Clamp diode in RCD snubber networks protecting IGBTs in 3-phase 400V industrial drives.

IC Role / Device Role / Timing Role: Fast-turn-on clamping element absorbing inductive energy spikes; role defined by V_RRM margin and t_rr-driven voltage overshoot control.

Use Value: 50V V_RRM provides 2× margin over 24V bus clamping targets, while 35ns t_rr limits peak clamp voltage to <65V during 1µs dV/dt events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L05S	V_RRM = 50V, I_F = 3A, t_rr = 30ns, V_F = 0.92V @ 3A - slightly faster and lower V_F, but DO-201AD footprint identical	Same mounting and thermal interface; preferred where <30ns t_rr required for >500 kHz designs	Select STTH3L05S when optimizing for minimum switching loss in high-frequency resonant converters
ON Semi MUR305	V_RRM = 50V, I_F = 3A, t_rr = 50ns, V_F = 0.97V @ 3A - slower recovery, same package and current rating	Higher Q_rr increases MOSFET turn-on loss; acceptable in <100 kHz applications with relaxed EMI requirements	Choose MUR305 only if cost sensitivity outweighs efficiency and EMI targets in legacy 50–100 kHz designs

Compared with STTH3L05S and MUR305, the SF31G R0G delivers balanced performance: 35ns t_rr enables mid-frequency SMPS efficiency gains without the premium pricing of ultra-fast variants, while maintaining full DO-201AD compatibility and proven reliability in industrial power supplies.

Availability

SF31G R0G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant manufacturing.

Supply support for SF31G 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, serving industrial, computing, and consumer markets since 1979.

The SF31G R0G belongs to TSC's SF3xG super fast rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained industrial and automotive auxiliary power supplies.

FAQ

What is the maximum junction temperature rating for SF31G R0G?

The SF31G R0G has a maximum junction temperature (T_J) of +150°C and a minimum of −55°C. This rating allows reliable operation in under-hood automotive auxiliary supplies and industrial environments with elevated ambient temperatures. Derating curves in the official datasheet define safe I_F limits above 75°C ambient. The SF31G R0G must be mounted on PCB copper with adequate thermal relief to maintain T_J ≤ 150°C under full 3A load.

Is SF31G R0G AEC-Q101 qualified?

No, SF31G R0G is not AEC-Q101 qualified. The "R0G" suffix denotes the standard industrial-grade version. AEC-Q101 qualified versions are marked with "H" suffix (e.g., SF31GH). While SF31G R0G shares the same die and DO-201AD package, only SF31GH undergoes the full stress test sequence per AEC-Q101. For automotive body electronics requiring qualification, SF31GH must be specified instead of SF31G R0G.

What does the "R0G" suffix mean in SF31G R0G?

The "R0G" suffix in SF31G R0G identifies the packaging and environmental specification: "R" indicates tape-and-reel packaging (1,250 pcs/reel), "0" is a placeholder, and "G" denotes green (halogen-free) molding compound compliant with IEC 61249-2-21. It is not an AEC-Q101 indicator - that requires "H". The SF31G R0G is functionally identical to SF31G in electrical specs and DO-201AD mechanical form.

What is the reverse recovery time measurement condition for SF31G R0G?

The reverse recovery time (t_rr) of 35 ns for SF31G R0G is measured under standardized conditions: forward current I_F = 0.5 A, reverse current I_R = 1.0 A, and reverse recovery current I_rr = 0.25 A, per JEDEC JESD24-11. This test setup reflects real-world switching behavior in hard-commutated topologies. The SF31G R0G maintains this t_rr value across its full operating temperature range (−55°C to +150°C), with minor variation below ±10%.

Can SF31G R0G replace a standard FR107 diode in a 50 kHz flyback supply?

Yes, SF31G R0G can directly replace FR107 in a 50 kHz flyback supply due to identical DO-201AD package, 50V V_RRM, and 3A I_F rating. However, SF31G R0G offers significantly faster t_rr (35 ns vs. 500 ns for FR107), reducing switching loss and EMI. Thermal design must verify R_θJL = 10°C/W meets system cooling requirements. No PCB changes are needed - the SF31G R0G fits the same footprint and solder profile as FR107.

SF31G R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

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

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 3 A

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

Reverse Recovery Time (trr):: 35 ns

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

Capacitance @ Vr, F:: 80pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF31G R0G FAQ

1.How can I place an order for SF31G R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF31G 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 SF31G R0G reliable?

The price and inventory of SF31G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF31G R0G is usually 5 days.

3.What payment methods are accepted for SF31G R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF31G R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF31G R0G?

SF31G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF31G 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 SF31G R0G?

For technical support, including SF31G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF31G R0G requirements.

6.How does Aetrix verify that SF31G R0G is sourced from the original manufacturer or authorized distributors?

All SF31G 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 SF31G R0G meets industry standards.

7.What is the process for return or replacement of SF31G R0G?

All SF31G R0G units undergo pre-shipment inspection (PSI). If there is an issue with SF31G 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 SF31G R0G part is unused and in its original packaging.

Return procedure for SF31G R0G:

1.Submit a request within 90 days.

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

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