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

Taiwan Semiconductor Corporation SF34G B0G

Name: SF34G B0G
Brand: Taiwan Semiconductor Corporation
SKU: SF34G B0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF34G B0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF34G B0G.pdf

Description:: DIODE GEN PURP 200V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:9,411

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Product details

Overview

SF34G B0G from Taiwan Semiconductor is a 200V, 3A super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 0.95V forward voltage at 3A/25°C, and 125A surge capability - deployed in switching-mode DC-DC converters and freewheeling paths for high-efficiency power supplies.

For engineers reviewing the SF34G B0G datasheet, SF34G B0G pinout, SF34G B0G application, or SF34G B0G equivalent, key selection criteria include V_RRM = 200V, I_F = 3A, t_rr = 35ns, R_θJL = 10°C/W, and DO-201AD mechanical compatibility with automated through-hole or surface-mount reflow assembly.

Technical Context

This single-die silicon rectifier operates as a unidirectional current switch with ultra-fast recovery (t_rr ≤ 35ns), enabling high-frequency (>100 kHz) switching topologies. Its low V_F (0.95V @ 3A) and low junction-to-lead thermal resistance (10°C/W) reduce conduction loss and improve thermal management in compact power stages.

The device meets JESD201 Class 2 whisker resistance and uses pure tin-plated leads compliant with J-STD-002 solderability. Polarity is marked by cathode band; no AEC-Q101 qualification (B0G = standard grade, not H-suffix).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for blocking capability in flyback/freewheeling applications
I_F	3 A - Continuous average forward current rating at T_L = 75°C; defines steady-state power handling in DC-DC output stages
t_rr	35 ns - Reverse recovery time under IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables efficient operation up to ~500 kHz switching
V_F	0.95 V @ 3A, 25°C - Forward voltage drop; directly determines conduction loss (P_cond ≈ 2.85W at full load)
R_θJL	10 °C/W - Junction-to-lead thermal resistance; allows direct heatsinking via PCB copper pour or lead frame for thermal reliability
C_J	80 pF @ 1 MHz, 4V - Junction capacitance; impacts high-frequency switching noise and EMI filter design

Pinout & Package

DO-201AD axial-leaded package with cathode-indicating band; leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight: ~1.10 g.

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); must withstand I_FSM = 125A surge
Cathode (banded end)	Forward current exit / reverse voltage blocking terminal	Connected to output rail or ground return; blocks up to 200V reverse bias during off-state

Key Features

Feature	Design Value
Super fast recovery (t_rr ≤ 35 ns)	Enables high-frequency switching with minimal reverse recovery loss and reduced EMI generation
Low forward voltage (0.95 V @ 3A)	Reduces conduction losses by ~15% vs. standard fast rectifiers, improving efficiency in 12–48V output converters
High surge rating (I_FSM = 125 A)	Withstands transient overloads from inductive kickback or startup surges without degradation
DO-201AD mechanical robustness	UL 94V-0 molding compound and JESD201 Class 2 whisker resistance ensure long-term reliability in industrial environments

Applications

Buck Converter Output Stage	Active Clamp Flyback Snubber
Use Scenario: Used as synchronous rectifier replacement in 24V-output buck converters operating at 200–500 kHz. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side switch off-time. Use Value: 35ns t_rr minimizes reverse recovery charge (Q_rr), reducing switching loss and MOSFET stress compared to standard fast diodes.	Use Scenario: Placed across clamp capacitor and primary winding in active clamp flyback for telecom power supplies. IC Role / Device Role / Timing Role: Clamping diode conducting only during reset phase to recycle leakage energy. Use Value: 200V V_RRM and 125A I_FSM safely handle peak clamp voltage transients and surge currents without avalanche failure.
DC-DC Isolated Auxiliary Supply	Industrial Motor Drive Freewheeling
Use Scenario: Secondary-side rectifier in 5V/1A isolated flyback supplying control logic and gate drivers. IC Role / Device Role / Timing Role: Unidirectional rectifier converting high-frequency AC from transformer secondary to regulated DC. Use Value: 0.95V V_F ensures >85% efficiency at light loads, critical for standby power compliance.	Use Scenario: Freewheeling path across H-bridge leg in 24V BLDC motor controllers. IC Role / Device Role / Timing Role: Provides safe current recirculation when PWM switches turn off abruptly. Use Value: 10°C/W R_θJL allows direct thermal coupling to PCB copper, maintaining T_J < 135°C under 3A continuous conduction.

Buck Converter Output Stage

Active Clamp Flyback Snubber

Use Scenario: Used as synchronous rectifier replacement in 24V-output buck converters operating at 200–500 kHz.

IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side switch off-time.

Use Value: 35ns t_rr minimizes reverse recovery charge (Q_rr), reducing switching loss and MOSFET stress compared to standard fast diodes.

Use Scenario: Placed across clamp capacitor and primary winding in active clamp flyback for telecom power supplies.

IC Role / Device Role / Timing Role: Clamping diode conducting only during reset phase to recycle leakage energy.

Use Value: 200V V_RRM and 125A I_FSM safely handle peak clamp voltage transients and surge currents without avalanche failure.

DC-DC Isolated Auxiliary Supply

Industrial Motor Drive Freewheeling

Use Scenario: Secondary-side rectifier in 5V/1A isolated flyback supplying control logic and gate drivers.

IC Role / Device Role / Timing Role: Unidirectional rectifier converting high-frequency AC from transformer secondary to regulated DC.

Use Value: 0.95V V_F ensures >85% efficiency at light loads, critical for standby power compliance.

Use Scenario: Freewheeling path across H-bridge leg in 24V BLDC motor controllers.

IC Role / Device Role / Timing Role: Provides safe current recirculation when PWM switches turn off abruptly.

Use Value: 10°C/W R_θJL allows direct thermal coupling to PCB copper, maintaining T_J < 135°C under 3A continuous conduction.

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 = 600V, t_rr = 35ns, V_F = 1.15V @ 3A - higher blocking, higher V_F	Preferred where input voltage exceeds 300V or universal input AC-DC is required	Select STTH3L06S only if system requires >200V reverse margin; otherwise SF34G B0G offers lower conduction loss
ON Semi MUR320	V_RRM = 200V, t_rr = 35ns, V_F = 0.92V @ 3A - near-identical specs, slightly lower V_F	Drop-in compatible in DO-201AD footprint; same thermal and electrical envelope	MUR320 is a functional alternative with marginally better V_F; verify marking and tape/reel packaging (B0G = 1250/reel)

Compared with STTH3L06S and MUR320, SF34G B0G delivers optimal balance of 200V blocking, 0.95V V_F, and proven DO-201AD manufacturability - making it preferred for cost-sensitive, high-volume 24–48V DC-DC designs where exact V_RRM matching matters.

Availability

SF34G B0G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling circuits requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for SF34G B0G 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 SF3xG series targets high-efficiency power conversion systems, emphasizing fast recovery, low V_F, and rugged packaging for reliable operation in demanding switching power supplies and motor controls.

FAQ

What is the maximum junction temperature rating for SF34G B0G?

The SF34G B0G has a maximum junction temperature (T_J) of +150°C, with operational storage range from –55°C to +150°C. This rating supports use in enclosed industrial enclosures and automotive under-hood auxiliary supplies where ambient temperatures exceed 85°C, provided thermal design maintains T_J within limit using the 10°C/W R_θJL.

Is SF34G B0G AEC-Q101 qualified?

No, SF34G B0G is not AEC-Q101 qualified. The "B0G" suffix indicates standard industrial grade; AEC-Q101 versions carry "H" suffix (e.g., SF34GH). For automotive applications requiring stress-tested reliability, SF34GH must be selected instead of SF34G B0G.

What does the "B0G" in SF34G B0G signify?

The "B0G" denotes packaging and grading: "B" = tape-and-reel packaging (1250 units per reel), "0" = standard temperature grade (non-AEC-Q101), "G" = green (halogen-free) compound per IEC 61249-2-21. It is distinct from "H"-suffix AEC-Q101 variants and "A0G" ammo box packaging.

Can SF34G B0G replace SF34G in existing designs?

Yes, SF34G B0G is functionally identical to SF34G - both share identical electrical specs (V_RRM = 200V, t_rr = 35ns, V_F = 0.95V), DO-201AD package, and marking. The "B0G" suffix only specifies tape-and-reel packaging and halogen-free material; no circuit-level redesign is needed.

What is the reverse leakage current specification for SF34G B0G at 125°C?

At T_J = 125°C and rated reverse voltage (200V), the SF34G B0G exhibits a maximum reverse leakage current (I_R) of 100 µA, per datasheet Note 2 (30ms pulse test). This value is critical for low-power standby modes where leakage directly impacts quiescent current.

SF34G B0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Bulk

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 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 @ 200 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

SF34G B0G FAQ

1.How can I place an order for SF34G B0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF34G B0G 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 SF34G B0G reliable?

The price and inventory of SF34G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF34G B0G is usually 5 days.

3.What payment methods are accepted for SF34G B0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF34G B0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF34G B0G?

SF34G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF34G B0G 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 SF34G B0G?

For technical support, including SF34G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF34G B0G requirements.

6.How does Aetrix verify that SF34G B0G is sourced from the original manufacturer or authorized distributors?

All SF34G B0G 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 SF34G B0G meets industry standards.

7.What is the process for return or replacement of SF34G B0G?

All SF34G B0G units undergo pre-shipment inspection (PSI). If there is an issue with SF34G B0G, 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 SF34G B0G part is unused and in its original packaging.

Return procedure for SF34G B0G:

1.Submit a request within 90 days.

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

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