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

Taiwan Semiconductor Corporation SF46G

Name: SF46G
Brand: Taiwan Semiconductor Corporation
SKU: SF46G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF46G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF46G.pdf

Description:: DIODE GEN PURP 400V 4A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

SF46G from Taiwan Semiconductor is a 4A, 400V super fast rectifier diode in DO-201AD package, featuring 1.3V forward voltage at 4A and 35ns reverse recovery time, used for freewheeling and switching-mode power conversion in industrial DC-DC converters.

For engineers reviewing the SF46G datasheet, SF46G pinout, SF46G application, or SF46G equivalent, key selection criteria include V_RRM = 400V, I_F = 4A, t_rr = 35ns, V_F = 1.3V, and DO-201AD mechanical compatibility with high-surge (I_FSM = 125A) and thermal (R_θJA = 25°C/W) requirements.

Technical Context

The SF46G is a single-die silicon planar junction super fast recovery rectifier optimized for high-frequency switching applications. Its 35ns reverse recovery time and low 80pF junction capacitance enable efficient operation in SMPS operating up to several hundred kHz.

It operates across -55°C to +150°C junction temperature range with 125A non-repetitive surge capability and meets JESD201 Class 2 whisker resistance and RoHS/halogen-free compliance per IEC 61249-2-21.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse blocking voltage; defines safe DC/peak AC voltage limit in flyback or boost topologies
I_F	4 A - Continuous average forward current; sets thermal design baseline for heatsinking in 100% duty-cycle operation
t_rr	35 ns - Reverse recovery time; enables high-frequency switching (>200 kHz) with minimal switching loss and EMI
V_F	1.3 V @ 4A, 25°C - Forward voltage drop; determines conduction loss (5.2W max at full load) and thermal rise
I_FSM	125 A - Peak non-repetitive surge current; supports inrush and transient overload without failure
R_θJA	25 °C/W - Junction-to-ambient thermal resistance; defines required PCB copper area or heatsink for T_J ≤ 150°C
C_J	80 pF @ 1MHz, 4V - Junction capacitance; impacts high-frequency noise coupling and snubber design in hard-switched circuits

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, UL 94V-0 molded compound, 1.10g mass.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential node (e.g., switch node in buck, source in flyback); must handle 4A continuous and 125A surge
Cathode	Forward current exit / reverse blocking terminal	Marked by band; connects to output rail or positive bus; blocks up to 400V reverse during off-state

Key Features

Feature	Design Value
Super fast recovery (t_rr = 35 ns)	Reduces switching losses and EMI generation in high-frequency SMPS, enabling smaller magnetics and filters
Low forward voltage (V_F = 1.3 V)	Lowers conduction loss by ~15% vs. standard fast rectifiers at 4A, improving efficiency in 12–48V output stages
High surge rating (I_FSM = 125 A)	Withstands repeated cold-start surges and short-circuit transients without degradation in industrial power supplies
DO-201AD mechanical robustness	UL 94V-0 compound and JESD201 Class 2 whisker resistance ensure long-term reliability in vibration-prone environments
AEC-Q101 qualified option available	Enables use in automotive under-hood power modules where qualification to stress-test standards is mandatory

Applications

DC-DC Converters	Switching Inverters
Use Scenario: Secondary-side rectification in isolated 24V–48V telecom DC-DC bricks operating at 200–500 kHz. IC Role / Device Role / Timing Role: Super fast rectifier providing unidirectional current path with minimal reverse recovery loss. Use Value: 35ns t_rr and 80pF C_J reduce switching node ringing and improve efficiency by >1.2% vs. standard fast diodes at 300 kHz.	Use Scenario: Freewheeling path in three-phase motor drive inverters with IGBTs switching at 8–16 kHz. IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback energy during IGBT turn-off. Use Value: 125A I_FSM handles peak regeneration currents; 1.3V V_F limits clamp power dissipation during extended braking cycles.
SMPS Power Supplies	Industrial UPS Systems
Use Scenario: Output rectification in 300W server PSU PFC + LLC stages requiring high reliability and low EMI. IC Role / Device Role / Timing Role: High-current secondary rectifier in synchronous or quasi-resonant topologies. Use Value: DO-201AD package allows manual or automated through-hole assembly; R_θJA = 25°C/W supports derating to 3.2A at 70°C ambient.	Use Scenario: Battery charging and backup power path rectification in 1–5 kVA industrial UPS with wide input voltage range. IC Role / Device Role / Timing Role: Input-stage AC-DC rectifier handling line surges and brownouts. Use Value: 400V V_RRM accommodates 277VAC nominal input with 20% overvoltage margin; -55°C to +150°C T_J rating ensures operation in hot enclosures.

DC-DC Converters

Switching Inverters

Use Scenario: Secondary-side rectification in isolated 24V–48V telecom DC-DC bricks operating at 200–500 kHz.

IC Role / Device Role / Timing Role: Super fast rectifier providing unidirectional current path with minimal reverse recovery loss.

Use Value: 35ns t_rr and 80pF C_J reduce switching node ringing and improve efficiency by >1.2% vs. standard fast diodes at 300 kHz.

Use Scenario: Freewheeling path in three-phase motor drive inverters with IGBTs switching at 8–16 kHz.

IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback energy during IGBT turn-off.

Use Value: 125A I_FSM handles peak regeneration currents; 1.3V V_F limits clamp power dissipation during extended braking cycles.

SMPS Power Supplies

Industrial UPS Systems

Use Scenario: Output rectification in 300W server PSU PFC + LLC stages requiring high reliability and low EMI.

IC Role / Device Role / Timing Role: High-current secondary rectifier in synchronous or quasi-resonant topologies.

Use Value: DO-201AD package allows manual or automated through-hole assembly; R_θJA = 25°C/W supports derating to 3.2A at 70°C ambient.

Use Scenario: Battery charging and backup power path rectification in 1–5 kVA industrial UPS with wide input voltage range.

IC Role / Device Role / Timing Role: Input-stage AC-DC rectifier handling line surges and brownouts.

Use Value: 400V V_RRM accommodates 277VAC nominal input with 20% overvoltage margin; -55°C to +150°C T_J rating ensures operation in hot enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4R04DJF	V_RRM = 400V, t_rr = 30ns, V_F = 1.25V @ 4A, TO-220AC package	Higher thermal mass but requires mounting hardware; better for >5A continuous designs	Choose when board space permits TO-220 and higher surge margin is needed beyond 125A
ON Semi MUR440G	V_RRM = 400V, t_rr = 35ns, V_F = 1.3V @ 4A, DO-201AD package, AEC-Q101 qualified	Identical electrical specs and footprint; certified for automotive use	Choose when AEC-Q101 qualification is mandatory and DO-201AD form factor must be retained

Compared with STTH4R04DJF and MUR440G, the SF46G offers identical DO-201AD fit and 400V/4A/35ns performance at lower cost, while MUR440G adds automotive qualification and STTH4R04DJF provides superior thermal handling via TO-220AC.

Availability

SF46G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial UPS systems requiring stable component supply with consistent DO-201AD lead-form and 400V blocking capability.

Supply support for SF46G 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 SF41G–SF48G super fast rectifier family targets high-efficiency, high-reliability power conversion in cost-sensitive industrial and telecom applications, emphasizing low V_F, fast t_rr, and robust mechanical construction.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF46G?

The SF46G has a V_RRM of 400 V, confirmed in the Absolute Maximum Ratings table on page 2 of the G2105 datasheet. This rating defines the highest reverse voltage the device can block repeatedly without breakdown, making it suitable for 277VAC-derived DC bus applications with safety margin.

What is the forward voltage (V_F) of SF46G at rated current?

The SF46G exhibits a maximum forward voltage of 1.3 V at 4 A and 25°C junction temperature, as specified in the Electrical Specifications table. This value directly determines conduction loss-5.2 W at full load-and must be derated at elevated temperatures per the Fig.4 forward characteristics curve.

Is SF46G available in an AEC-Q101 qualified version?

Yes, the AEC-Q101 qualified version of SF46G is designated SF46GH (with "H" suffix), as stated in the Ordering Information section. It shares identical electrical and mechanical specifications with SF46G but undergoes additional stress testing per AEC-Q101 standard for automotive under-hood use.

What is the reverse recovery time (t_rr) of SF46G and how is it measured?

The SF46G has a maximum reverse recovery time of 35 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, as defined in the Electrical Specifications table. This parameter is critical for minimizing switching loss and EMI in high-frequency SMPS designs above 100 kHz.

What package type does SF46G use and what are its key mechanical features?

SF46G uses the DO-201AD axial-leaded package, with pure tin-plated leads compliant with J-STD-002, UL 94V-0 flammability-rated molding compound, and cathode polarity indicated by a band. Its 1.10g mass and standardized lead spacing support both manual and automated through-hole assembly.

SF46G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 4 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 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

SF46G FAQ

1.How can I place an order for SF46G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF46G 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 SF46G reliable?

The price and inventory of SF46G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF46G is usually 5 days.

3.What payment methods are accepted for SF46G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF46G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF46G?

SF46G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF46G 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 SF46G?

For technical support, including SF46G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF46G requirements.

6.How does Aetrix verify that SF46G is sourced from the original manufacturer or authorized distributors?

All SF46G 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 SF46G meets industry standards.

7.What is the process for return or replacement of SF46G?

All SF46G units undergo pre-shipment inspection (PSI). If there is an issue with SF46G, 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 SF46G part is unused and in its original packaging.

Return procedure for SF46G:

1.Submit a request within 90 days.

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

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