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

Taiwan Semiconductor Corporation SF12G B0G

Name: SF12G B0G
Brand: Taiwan Semiconductor Corporation
SKU: SF12G B0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF12G B0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SF12G B0G.pdf

Description:: DIODE GEN PURP 100V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:2,352

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Product details

Overview

SF12G B0G from Taiwan Semiconductor is a 1A, 100V super fast recovery rectifier diode in DO-204AL (DO-41) package, featuring 35ns reverse recovery time, 0.95V forward voltage at 1A/25°C, and 30A surge capability - used in DC-DC converters and switching-mode power supplies for efficient freewheeling and output rectification.

For engineers reviewing the SF12G B0G datasheet, SF12G B0G pinout, SF12G B0G application, or SF12G B0G equivalent, key selection criteria include V_RRM = 100 V, I_F = 1 A, t_rr = 35 ns, V_F = 0.95 V, and DO-41 mechanical compatibility in high-frequency power conversion designs.

Technical Context

The SF12G B0G implements a single-die silicon PN junction optimized for super-fast switching with low stored charge, enabling reduced switching losses in high-frequency SMPS topologies. Its 35 ns reverse recovery time and 20 °C/W junction-to-lead thermal resistance support reliable operation under repetitive surge conditions up to 30 A (8.3 ms half-sine).

Designed for unidirectional conduction, it features a cathode-banded polarity marking, pure tin-plated leads compliant with J-STD-002, and UL 94V-0 mold compound - meeting automotive-grade reliability per AEC-Q101 when ordered with 'H' suffix (not applicable to B0G variant).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - maximum repetitive reverse voltage before breakdown; sets upper limit for circuit blocking capability
I_F	1 A - continuous average forward current rating at T_A = 75°C; defines steady-state power handling
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables operation up to ~3 MHz switching frequencies
V_F	0.95 V @ 1 A, 25°C - forward voltage drop directly impacts conduction loss and thermal rise in output stage
R_θJL	20 °C/W - junction-to-lead thermal resistance; determines temperature rise above lead temperature under 1 A DC load
I_FSM	30 A - non-repetitive peak surge current (8.3 ms half-sine); supports inrush and fault-current tolerance

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode indicated by a painted band on the body; leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must withstand 30 A surge
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; connects to output rail; blocks 100 V reverse bias during off-state

Key Features

Feature	Design Value
Super fast recovery	t_rr = 35 ns enables high-frequency operation (>1 MHz) with minimal switching loss
Low forward voltage	V_F = 0.95 V @ 1 A reduces conduction loss and improves efficiency in 12–48 V output stages
High surge robustness	I_FSM = 30 A supports startup surges and transient overloads without failure
Thermally efficient package	R_θJL = 20 °C/W allows direct heat transfer to PCB copper or heatsink via lead frame

Applications

DC-DC Converters	Switching Inverters
Use Scenario: Secondary-side synchronous rectification in isolated flyback or forward converters delivering 5–24 V at ≤1 A. IC Role / Device Role / Timing Role: Freewheeling diode providing unidirectional current path during MOSFET off-time. Use Value: 35 ns t_rr minimizes reverse recovery loss, while 0.95 V V_F maintains >88% efficiency at full load.	Use Scenario: Output rectification in single-phase H-bridge inverters for UPS or solar microinverters. IC Role / Device Role / Timing Role: High-speed clamp and commutation diode handling bidirectional reactive energy. Use Value: 100 V V_RRM and 30 A I_FSM ensure safe operation during inductive kickback and grid synchronization transients.
AC-DC Adapters	Industrial Power Supplies
Use Scenario: Output rectification in compact 12 V/1 A wall adapters with high-density layout constraints. IC Role / Device Role / Timing Role: Primary output rectifier replacing slower general-purpose diodes to reduce size and thermal footprint. Use Value: DO-41 package fits standard through-hole footprints; 0.35 g weight supports automated assembly and vibration resilience.	Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules requiring long-term reliability. IC Role / Device Role / Timing Role: Low-loss, high-reliability rectifier in 24 V control rail generation. Use Value: UL 94V-0 molding and JESD 201 Class 2 whisker compliance ensure safety and longevity in harsh industrial environments.

DC-DC Converters

Switching Inverters

Use Scenario: Secondary-side synchronous rectification in isolated flyback or forward converters delivering 5–24 V at ≤1 A.

IC Role / Device Role / Timing Role: Freewheeling diode providing unidirectional current path during MOSFET off-time.

Use Value: 35 ns t_rr minimizes reverse recovery loss, while 0.95 V V_F maintains >88% efficiency at full load.

Use Scenario: Output rectification in single-phase H-bridge inverters for UPS or solar microinverters.

IC Role / Device Role / Timing Role: High-speed clamp and commutation diode handling bidirectional reactive energy.

Use Value: 100 V V_RRM and 30 A I_FSM ensure safe operation during inductive kickback and grid synchronization transients.

AC-DC Adapters

Industrial Power Supplies

Use Scenario: Output rectification in compact 12 V/1 A wall adapters with high-density layout constraints.

IC Role / Device Role / Timing Role: Primary output rectifier replacing slower general-purpose diodes to reduce size and thermal footprint.

Use Value: DO-41 package fits standard through-hole footprints; 0.35 g weight supports automated assembly and vibration resilience.

Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules requiring long-term reliability.

IC Role / Device Role / Timing Role: Low-loss, high-reliability rectifier in 24 V control rail generation.

Use Value: UL 94V-0 molding and JESD 201 Class 2 whisker compliance ensure safety and longevity in harsh industrial environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R010U (STMicroelectronics)	V_RRM = 100 V, t_rr = 30 ns, V_F = 0.92 V @ 1 A - slightly faster and lower V_F, but DO-204AL package identical	Same footprint and function; preferred where <5 ns t_rr reduction justifies sourcing change	Select STTH1R010U if optimizing for lowest possible switching loss in >500 kHz designs
ES1B (ON Semiconductor)	V_RRM = 100 V, t_rr = 35 ns, V_F = 0.98 V @ 1 A - nearly identical timing, +0.03 V higher V_F, same DO-41 package	Drop-in replacement with no layout change; suited for cost-sensitive industrial BOMs	Choose ES1B when prioritizing second-source availability and qualification continuity over marginal V_F gain

Compared with STTH1R010U and ES1B, the SF12G B0G offers balanced performance: identical t_rr to ES1B but lower V_F, and slightly higher V_F than STTH1R010U while maintaining Taiwan Semiconductor's process consistency and traceable green compound (G-marked).

Availability

SF12G B0G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply, consistent DO-41 form factor, and verified 100 V/1 A super fast rectification performance.

Supply support for SF12G 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, specializing in rectifiers, TVS diodes, MOSFETs, and bipolar transistors since 1979.

The SF11G–SF18G family was developed to deliver cost-effective, high-reliability super fast rectifiers for mainstream power conversion - emphasizing low V_F, controlled t_rr, and robust thermal performance in standard DO-41 packaging.

FAQ

What is the maximum junction temperature rating for SF12G B0G?

The SF12G B0G has a maximum junction temperature (T_J) of +150°C, with an operating range from –55°C to +150°C. This rating allows reliable use in enclosed power supplies and industrial environments where ambient temperatures exceed 70°C, provided thermal design accounts for R_θJL = 20°C/W and appropriate PCB copper area is allocated for heat dissipation. The SF12G B0G must not exceed this limit during continuous or surge operation.

Does SF12G B0G meet AEC-Q101 automotive qualification?

No, SF12G B0G does not meet AEC-Q101 qualification. The 'B0G' suffix indicates standard commercial-grade packaging (green compound, ammo box packing), whereas AEC-Q101 qualification requires the 'H' suffix (e.g., SF12GH). Only variants explicitly marked with 'H' undergo stress testing per AEC-Q101 Rev D; SF12G B0G is rated for industrial and consumer applications only.

What is the reverse leakage current specification for SF12G B0G at elevated temperature?

At T_J = 125°C and rated reverse voltage (100 V), the SF12G B0G exhibits a maximum reverse leakage current (I_R) of 100 µA, per pulse test (PW = 30 ms). At 25°C, I_R is limited to 5 µA. This low leakage ensures minimal standby power loss in battery-backed or energy-sensitive systems using the SF12G B0G as a hold-up or isolation diode.

Can SF12G B0G be used as a direct replacement for 1N4934 in existing designs?

Yes, SF12G B0G is a functional upgrade to 1N4934: both are DO-41 packaged 100 V/1 A fast rectifiers, but SF12G B0G offers t_rr = 35 ns vs. 1N4934's 200 ns, and V_F = 0.95 V vs. ~1.1 V. No PCB changes are needed due to identical pinout and dimensions; however, improved switching speed may require re-evaluation of snubber networks in high-dV/dt circuits using the SF12G B0G.

What does the 'B0G' suffix mean in SF12G B0G ordering code?

The 'B0G' suffix in SF12G B0G denotes packaging and environmental compliance: 'B' indicates tape-and-reel packaging (5,000 pcs/reel), '0' is a placeholder, and 'G' specifies halogen-free, RoHS-compliant green molding compound per IEC 61249-2-21. It is distinct from 'H' (AEC-Q101 qualified) or 'A0G' (ammo box packing). The SF12G B0G is supplied in 5,000-unit reels with J-STD-002 solderable leads.

SF12G B0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 100 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 1 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 100 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

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

SF12G B0G FAQ

1.How can I place an order for SF12G B0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF12G 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 SF12G B0G reliable?

The price and inventory of SF12G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF12G B0G is usually 5 days.

3.What payment methods are accepted for SF12G B0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF12G B0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF12G B0G?

SF12G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF12G 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 SF12G B0G?

For technical support, including SF12G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF12G B0G requirements.

6.How does Aetrix verify that SF12G B0G is sourced from the original manufacturer or authorized distributors?

All SF12G 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 SF12G B0G meets industry standards.

7.What is the process for return or replacement of SF12G B0G?

All SF12G B0G units undergo pre-shipment inspection (PSI). If there is an issue with SF12G 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 SF12G B0G part is unused and in its original packaging.

Return procedure for SF12G B0G:

1.Submit a request within 90 days.

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

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