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

Taiwan Semiconductor Corporation SF12G R1G

Name: SF12G R1G
Brand: Taiwan Semiconductor Corporation
SKU: SF12G R1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF12G R1G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SF12G R1G.pdf

Description:: DIODE GEN PURP 100V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:5,672

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Product details

Overview

SF12G R1G 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 R1G datasheet, SF12G R1G pinout, SF12G R1G application, or SF12G R1G equivalent, key selection criteria include V_RRM = 100V, I_F = 1A, t_rr = 35ns, V_F = 0.95V, and DO-41 mechanical compatibility in high-frequency switching topologies.

Technical Context

The SF12G R1G implements a single-die silicon PN junction optimized for super-fast recovery (t_rr ≤ 35ns), enabling operation in high-frequency SMPS up to several hundred kHz. Its low V_F (0.95V @ 1A) and low C_J (20pF @ 4V) reduce conduction and switching losses simultaneously.

Thermally, it delivers R_θJL = 20°C/W and R_θJA = 80°C/W in DO-41 package, supporting continuous 1A operation up to +125°C ambient with appropriate PCB copper area. Polarity is marked by cathode band; leads are pure tin-plated per J-STD-002.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in 100V-rated DC-DC outputs.
I_F	1 A - Continuous average forward current; supports compact 1A-output flyback or buck converters without heatsinking.
t_rr	35 ns - Reverse recovery time; enables stable operation at ≥200 kHz switching frequencies with minimal switching loss.
V_F	0.95 V @ 1A/25°C - Low forward voltage drop; reduces conduction loss to ~0.95W at full load, improving efficiency.
C_J	20 pF @ 1MHz/4V - Junction capacitance; limits high-frequency displacement current and EMI generation in snubberless designs.
I_FSM	30 A - Non-repetitive surge rating; withstands inrush and fault currents in 12V–48V input systems.
T_J(max)	+150°C - Maximum junction temperature; allows operation in sealed industrial enclosures with limited airflow.

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case meeting UL 94V-0; cathode indicated by band; weight ≈ 0.350g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); accepts 1A continuous, 30A surge.
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail; blocks up to 100V reverse bias; marked by visible band on body.

Key Features

Feature	Design Value
Super-fast recovery (t_rr ≤ 35ns)	Enables high-frequency switching (>200 kHz) with low turn-off loss and reduced EMI vs. standard rectifiers.
Low V_F (0.95V @ 1A)	Minimizes conduction loss in 1A-output power stages, improving thermal margin and efficiency in space-constrained designs.
DO-41 package with tin-plated leads	Ensures reliable solderability per J-STD-002 and compatibility with automated through-hole assembly processes.
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and environmental requirements for automotive and industrial end equipment.

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Used as secondary-side rectifier in isolated 12V/1A flyback converters powering industrial sensors. IC Role / Device Role / Timing Role: Power rectifier converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 35ns t_rr prevents reverse recovery oscillation, while 0.95V V_F keeps conduction loss under 1W at full load.	Use Scenario: Placed across inductive loads (e.g., solenoids, relay coils) in 24V automotive control modules. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during MOSFET turn-off. Use Value: 100V V_RRM safely absorbs 24V × 3× transients; 30A I_FSM handles repeated coil energy dumps.
Buck Converter Synchronous Replacement	AC-DC Adapter Secondary Rectification
Use Scenario: As low-cost asynchronous rectifier in cost-sensitive 5V/1A buck regulators where synchronous FETs are omitted. IC Role / Device Role / Timing Role: Uncontrolled rectifier providing unidirectional current path during low-side switch off-time. Use Value: DO-41 footprint allows direct replacement of legacy 1N400x; 35ns t_rr avoids cross-conduction issues in 500kHz designs.	Use Scenario: Output rectifier in 12V/1A wall adapters for consumer electronics with universal AC input. IC Role / Device Role / Timing Role: High-efficiency rectifier converting transformer secondary AC to DC after filtering. Use Value: 20pF C_J minimizes capacitive coupling noise; RoHS/halogen-free compliance meets global safety certifications.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Used as secondary-side rectifier in isolated 12V/1A flyback converters powering industrial sensors.

IC Role / Device Role / Timing Role: Power rectifier converting high-frequency AC from transformer secondary into regulated DC output.

Use Value: 35ns t_rr prevents reverse recovery oscillation, while 0.95V V_F keeps conduction loss under 1W at full load.

Use Scenario: Placed across inductive loads (e.g., solenoids, relay coils) in 24V automotive control modules.

IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during MOSFET turn-off.

Use Value: 100V V_RRM safely absorbs 24V × 3× transients; 30A I_FSM handles repeated coil energy dumps.

Buck Converter Synchronous Replacement

AC-DC Adapter Secondary Rectification

Use Scenario: As low-cost asynchronous rectifier in cost-sensitive 5V/1A buck regulators where synchronous FETs are omitted.

IC Role / Device Role / Timing Role: Uncontrolled rectifier providing unidirectional current path during low-side switch off-time.

Use Value: DO-41 footprint allows direct replacement of legacy 1N400x; 35ns t_rr avoids cross-conduction issues in 500kHz designs.

Use Scenario: Output rectifier in 12V/1A wall adapters for consumer electronics with universal AC input.

IC Role / Device Role / Timing Role: High-efficiency rectifier converting transformer secondary AC to DC after filtering.

Use Value: 20pF C_J minimizes capacitive coupling noise; RoHS/halogen-free compliance meets global safety certifications.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R0100	V_RRM = 100V, t_rr = 30ns, V_F = 0.97V @ 1A - slightly faster but higher V_F; DO-41 package.	Same 100V/1A rating; optimized for ultra-low t_rr in PFC stages.	Prefer when <30ns t_rr is critical; verify layout thermal relief for identical DO-41 footprint.
ON Semi MUR110E	V_RRM = 100V, t_rr = 50ns, V_F = 0.92V @ 1A - slower recovery but lowest V_F; DO-41 package.	Better conduction loss at light load; less suitable above 150 kHz.	Select for cost-sensitive 50–100 kHz applications where efficiency at partial load outweighs switching speed.

Compared with STTH1R0100 and MUR110E, the SF12G R1G offers balanced t_rr/V_F trade-off (35ns/0.95V) ideal for 100–300 kHz industrial DC-DC converters requiring reliability, RoHS compliance, and proven DO-41 manufacturability.

Availability

SF12G R1G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for SF12G R1G 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 SF12G R1G belongs to TSC's SF1xG super fast rectifier family, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained and thermally demanding environments.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF12G R1G?

The SF12G R1G has a V_RRM of 100 V, meaning it can reliably block up to 100 volts of reverse-biased voltage in repetitive operation without breakdown. This rating is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version H2104), and aligns with the "12" in the part number indicating 100V (SF11G = 50V, SF12G = 100V, etc.). The SF12G R1G must not be operated beyond this limit in continuous or transient conditions.

Is SF12G R1G AEC-Q101 qualified?

No, SF12G R1G is not AEC-Q101 qualified. Only variants marked with suffix "H" (e.g., SF12GH) are AEC-Q101 qualified per the Ordering Information section. The "R1G" suffix denotes tape-and-reel packaging (5,000 pcs) and standard industrial grade. For automotive applications requiring qualification, SF12GH - not SF12G R1G - must be selected and verified against TSC's AEC-Q101 test reports.

What is the forward voltage (V_F) of SF12G R1G at rated current?

The SF12G R1G exhibits a typical forward voltage of 0.95 V at I_F = 1 A and T_J = 25°C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating. At elevated junction temperatures (e.g., 125°C), V_F decreases slightly; actual system-level V_F depends on thermal design and duty cycle. The SF12G R1G maintains this low V_F across its full 1A operating range.

Does SF12G R1G have a defined reverse recovery time (t_rr)?

Yes, the SF12G R1G has a maximum reverse recovery time of 35 ns, tested at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is explicitly listed in the Electrical Specifications table and distinguishes SF12G R1G as a "super fast" rectifier - significantly faster than general-purpose 1N400x diodes (t_rr > 2 µs). The SF12G R1G's 35 ns t_rr enables clean switching in high-frequency power supplies.

What package type does SF12G R1G use, and are the leads lead-free?

SF12G R1G uses the DO-204AL (DO-41) axial-leaded package, with pure tin-plated leads compliant with J-STD-002 for solderability. It is RoHS-compliant and halogen-free per IEC 61249-2-21. The "R1G" suffix indicates tape-and-reel packaging (5,000 units), not a package variant. No lead content is present - the leads are 100% tin-plated copper, fully compatible with lead-free reflow and wave soldering processes.

SF12G R1G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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 R1G FAQ

1.How can I place an order for SF12G R1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF12G R1G 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 R1G reliable?

The price and inventory of SF12G R1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF12G R1G is usually 5 days.

3.What payment methods are accepted for SF12G R1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF12G R1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF12G R1G?

SF12G R1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF12G R1G 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 R1G?

For technical support, including SF12G R1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF12G R1G requirements.

6.How does Aetrix verify that SF12G R1G is sourced from the original manufacturer or authorized distributors?

All SF12G R1G 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 R1G meets industry standards.

7.What is the process for return or replacement of SF12G R1G?

All SF12G R1G units undergo pre-shipment inspection (PSI). If there is an issue with SF12G R1G, 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 R1G part is unused and in its original packaging.

Return procedure for SF12G R1G:

1.Submit a request within 90 days.

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

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