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

Taiwan Semiconductor Corporation SF33G

Name: SF33G
Brand: Taiwan Semiconductor Corporation
SKU: SF33G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF33G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF33G.pdf

Description:: DIODE GEN PURP 150V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:5,356

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Product details

Overview

SF33G from Taiwan Semiconductor is a 150 V, 3 A super fast recovery rectifier diode in DO-201AD package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 3 A, and 125 A surge capability - used in DC-DC converters and switching inverters for high-efficiency power conversion.

For engineers reviewing the SF33G datasheet, SF33G pinout, SF33G application, or SF33G equivalent, key selection criteria include V_RRM = 150 V, I_F = 3 A, t_rr = 35 ns, V_F = 0.95 V (at 3 A), and DO-201AD thermal performance (R_θJL = 10 °C/W).

Technical Context

The SF33G is a single-die, planar junction silicon rectifier optimized for high-frequency switching applications. Its 35 ns reverse recovery time enables efficient operation in SMPS topologies up to several hundred kHz, while its 150 V V_RRM rating targets mid-voltage industrial and automotive auxiliary power rails.

Thermal design is supported by R_θJL = 10 °C/W and R_θJC = 9 °C/W, allowing direct lead-to-heatsink conduction. The device operates across –55 °C to +150 °C junction temperature range and meets JESD201 Class 2 whisker resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	150 V - maximum repetitive reverse voltage; defines safe blocking capability in 12–48 V system-derived bus designs
I_F	3 A continuous - average forward current rating at T_L = 75 °C; determines steady-state power handling without heatsink
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables low-loss commutation in 200–500 kHz converters
V_F	0.95 V @ 3 A, 25 °C - forward voltage drop directly impacts conduction loss and thermal rise in high-duty-cycle operation
I_FSM	125 A @ 8.3 ms half-sine - peak non-repetitive surge rating; supports inrush and fault-current tolerance
R_θJL	10 °C/W - junction-to-lead thermal resistance; enables PCB copper pour or clip-based thermal management without case mounting

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 ≈ 1.10 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to lower-potential side of load or switch node; requires adequate trace width for 3 A RMS
Cathode (banded end)	Forward current exit / reverse voltage blocking terminal	Connected to output rail or switching node; polarity must be verified before PCB assembly

Key Features

Feature	Design Value
Super fast recovery (t_rr = 35 ns)	Reduces switching losses and EMI generation in high-frequency DC-DC stages compared to standard rectifiers
Low V_F (0.95 V @ 3 A)	Minimizes conduction loss and thermal stress in compact, unheatsinked power supplies
High I_FSM (125 A)	Withstands repeated cold-start surges and short-circuit transients without degradation
DO-201AD mechanical robustness	UL 94V-0 molding compound and JESD201 Class 2 whisker resistance ensure long-term reliability in automotive and industrial environments

Applications

DC-DC Converter Secondary Side	Switching Inverter Freewheel Path
Use Scenario: Output rectification in isolated flyback or forward converters delivering 5–24 V at ≤3 A. IC Role / Device Role / Timing Role: Unidirectional current steering during transformer reset phase; conducts only when secondary winding voltage exceeds output rail. Use Value: 35 ns t_rr prevents reverse recovery tail current from overlapping with next switching cycle, reducing cross-conduction loss.	Use Scenario: Freewheeling path across IGBTs/MOSFETs in motor drive H-bridge inverters operating at 10–50 kHz. IC Role / Device Role / Timing Role: Provides low-loss return path for inductive current when main switch turns off. Use Value: 0.95 V V_F limits freewheeling conduction loss, improving inverter efficiency at partial load.
Automotive Auxiliary Power Supply	Industrial AC-DC Adapter Output Stage
Use Scenario: 12 V/24 V battery-fed buck-derived supply powering infotainment or body control modules. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in cost-sensitive designs where gate drive complexity is avoided. Use Value: AEC-Q101 qualified variant available; 150 V V_RRM provides margin against load dump transients up to ±100 V.	Use Scenario: Output rectification in universal-input (85–265 VAC) offline adapters rated ≤60 W. IC Role / Device Role / Timing Role: Main output diode in discontinuous conduction mode (DCM) flyback topology. Use Value: 125 A I_FSM withstands repeated 100 ms overloads during capacitor charging, ensuring field reliability.

DC-DC Converter Secondary Side

Switching Inverter Freewheel Path

Use Scenario: Output rectification in isolated flyback or forward converters delivering 5–24 V at ≤3 A.

IC Role / Device Role / Timing Role: Unidirectional current steering during transformer reset phase; conducts only when secondary winding voltage exceeds output rail.

Use Value: 35 ns t_rr prevents reverse recovery tail current from overlapping with next switching cycle, reducing cross-conduction loss.

Use Scenario: Freewheeling path across IGBTs/MOSFETs in motor drive H-bridge inverters operating at 10–50 kHz.

IC Role / Device Role / Timing Role: Provides low-loss return path for inductive current when main switch turns off.

Use Value: 0.95 V V_F limits freewheeling conduction loss, improving inverter efficiency at partial load.

Automotive Auxiliary Power Supply

Industrial AC-DC Adapter Output Stage

Use Scenario: 12 V/24 V battery-fed buck-derived supply powering infotainment or body control modules.

IC Role / Device Role / Timing Role: Synchronous rectifier replacement in cost-sensitive designs where gate drive complexity is avoided.

Use Value: AEC-Q101 qualified variant available; 150 V V_RRM provides margin against load dump transients up to ±100 V.

Use Scenario: Output rectification in universal-input (85–265 VAC) offline adapters rated ≤60 W.

IC Role / Device Role / Timing Role: Main output diode in discontinuous conduction mode (DCM) flyback topology.

Use Value: 125 A I_FSM withstands repeated 100 ms overloads during capacitor charging, ensuring field reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600 V, t_rr = 30 ns, V_F = 1.15 V @ 3 A, DO-201AD	Higher voltage rating; higher V_F increases conduction loss at 150 V-class systems	Select when >300 V blocking is required; avoid if minimizing V_F is critical in 150 V designs
ON Semi MUR315	V_RRM = 150 V, t_rr = 35 ns, V_F = 0.92 V @ 3 A, DO-201AD	Nearly identical specs; slightly lower V_F, no AEC-Q101 option listed	Drop-in alternative where automotive qualification is not mandatory; verify packaging and reel compatibility

Compared with STTH3L06S and MUR315, the SF33G offers optimal balance of low V_F, precise 150 V rating, and AEC-Q101 availability - making it preferred for cost-sensitive, thermally constrained 12–48 V automotive and industrial power supplies.

Availability

SF33G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for SF33G 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, automotive, and consumer markets since 1979.

The SF3xG series belongs to TSC's Super Fast Rectifier product line, engineered specifically for high-efficiency, high-frequency switching power supplies where low V_F, fast t_rr, and rugged thermal performance are essential.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF33G?

The SF33G has a V_RRM rating of 150 V, meaning it can safely block up to 150 V of repetitive reverse voltage in circuit operation. This value is confirmed in the Absolute Maximum Ratings table on page 2 of the H2105 datasheet and is specific to the SF33G variant - not extrapolated from adjacent part numbers.

Is SF33G suitable for automotive applications?

Yes - an AEC-Q101 qualified version of SF33G is available (ordering code: SF33GH). It meets stress test requirements for temperature cycling, humidity, and mechanical shock, making SF33G appropriate for under-hood and cabin electronics where reliability under thermal and vibration stress is critical.

What is the forward voltage (V_F) of SF33G at rated current?

The SF33G exhibits a typical forward voltage of 0.95 V at I_F = 3 A and T_J = 25 °C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents conduction loss under nominal load conditions.

Does SF33G have a defined reverse recovery time (t_rr)?

Yes - the SF33G has a maximum reverse recovery time of 35 ns, tested under standardized conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This parameter is explicitly listed in the Electrical Specifications section and applies directly to the SF33G, not inferred from family averages.

What package type does SF33G use, and what are its thermal characteristics?

SF33G uses the DO-201AD axial package with pure tin-plated leads. Its thermal performance includes R_θJL = 10 °C/W (junction-to-lead) and R_θJC = 9 °C/W (junction-to-case), enabling effective heat transfer through PCB copper or external heatsinking without requiring surface-mount reflow modifications.

SF33G 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):: 150 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 @ 150 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

SF33G FAQ

1.How can I place an order for SF33G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF33G 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 SF33G reliable?

The price and inventory of SF33G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF33G is usually 5 days.

3.What payment methods are accepted for SF33G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF33G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF33G?

SF33G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF33G 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 SF33G?

For technical support, including SF33G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF33G requirements.

6.How does Aetrix verify that SF33G is sourced from the original manufacturer or authorized distributors?

All SF33G 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 SF33G meets industry standards.

7.What is the process for return or replacement of SF33G?

All SF33G units undergo pre-shipment inspection (PSI). If there is an issue with SF33G, 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 SF33G part is unused and in its original packaging.

Return procedure for SF33G:

1.Submit a request within 90 days.

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

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