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Taiwan Semiconductor Corporation SF41G R0G
- Part No.:
- SF41G R0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF41G R0G.pdf
- Description:
- DIODE GEN PURP 50V 4A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,413
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Product details
Overview
SF41G from Taiwan Semiconductor is a 4A, 50V super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.0V max forward voltage at 4A/25°C, and 125A surge capability - used in DC-DC converters and freewheeling paths where low conduction loss and fast switching are critical.
For engineers reviewing the SF41G datasheet, SF41G pinout, SF41G application, or SF41G equivalent, key selection criteria include VRRM = 50V, IF = 4A, trr = 35ns, RθJA = 25°C/W, and DO-201AD mechanical compatibility with high-reliability power conversion designs.
Technical Context
This single-die, unidirectional super fast rectifier operates with a maximum junction temperature of 150°C and supports repetitive peak reverse voltages up to 50V. Its low 1.0V forward voltage drop at rated current minimizes conduction losses in high-frequency switching topologies.
The device achieves 35ns reverse recovery time under IF = 0.5A, IR = 1.0A, Irr = 0.25A test conditions, enabling efficient operation in SMPS and inverters. Junction-to-ambient thermal resistance is 25°C/W, supporting stable thermal performance in compact layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating range in DC-DC flyback or boost stages |
| IF | 4 A - Continuous forward current rating; determines minimum trace width and heatsinking in PCB layout |
| trr | 35 ns - Reverse recovery time; enables >100 kHz switching without excessive switching loss or EMI |
| VF (max) | 1.0 V @ 4A, 25°C - Low conduction loss directly reduces power dissipation and improves efficiency |
| IFSM | 125 A - Non-repetitive surge current rating; withstands inrush and fault transients in industrial power supplies |
| RθJA | 25 °C/W - Thermal resistance from junction to ambient; informs passive cooling requirements for 4A continuous operation |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking; 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 or transformer secondary) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to output rail or positive bus; blocks reverse voltage up to 50V |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr ≤ 35 ns) | Enables high-frequency operation (>100 kHz) with minimal switching loss and reduced EMI generation |
| Low VF (1.0 V max @ 4A) | Reduces conduction loss by ~15–20% vs. standard fast rectifiers, improving thermal margin in sealed enclosures |
| DO-201AD mechanical robustness | UL 94V-0 molding compound and 1.10g mass support vibration-resistant mounting in automotive and industrial environments |
| AEC-Q101 qualification option | Available as SF41GH variant for automotive-grade reliability - includes extended temperature cycling and bias HAST validation |
Applications
| DC-DC Buck Converter | Switch-Mode Inverter Output Stage |
|---|---|
Use Scenario: Step-down voltage regulation in telecom power modules delivering 12V/3.3V from 48V input. IC Role / Device Role / Timing Role: Freewheeling diode conducting during low-side switch off-time; handles 4A continuous current with minimal voltage overshoot. Use Value: 35ns trr prevents reverse recovery tail current, reducing cross-conduction loss and MOSFET stress during synchronous rectification transition. | Use Scenario: Output rectification in 1–3kW solar microinverters converting 40–60V DC to 230V AC. IC Role / Device Role / Timing Role: Unidirectional current path in full-bridge or center-tapped transformer secondary; blocks reverse voltage during polarity reversal. Use Value: 50V VRRM and 125A IFSM ensure reliable operation during grid-synchronization surges and lightning-induced transients. |
| Freewheeling in Inductive Loads | EMI-Sensitive Industrial SMPS |
Use Scenario: Protection path for relay coils, solenoids, and motor windings in PLC I/O modules. IC Role / Device Role / Timing Role: Clamping diode absorbing stored inductive energy when drive transistor turns off. Use Value: Fast 35ns recovery suppresses voltage spikes above 50V, eliminating need for TVS clamping and simplifying BOM. | Use Scenario: Auxiliary supply in medical imaging equipment requiring low EMI and high reliability. IC Role / Device Role / Timing Role: Secondary-side rectifier in isolated flyback supplying 5V/2A control logic. Use Value: Low 1.0V VF and 100pF CJ minimize conducted noise and improve transient response over competing 1N5822 variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-4EY50 | VRRM = 50V, trr = 35ns, VF = 1.05V @ 4A - slightly higher forward drop, same DO-201AD footprint | Same freewheeling and DC-DC use cases; validated in automotive infotainment power rails | Select if dual-sourcing required; verify thermal derating due to +0.05V VF impact on 4A steady-state loss |
| ON Semiconductor MUR450 | VRRM = 50V, trr = 35ns, VF = 0.97V @ 4A - marginally lower VF, but only JEDEC-compliant (not AEC-Q101 qualified) | Preferred for cost-sensitive industrial SMPS; not recommended for automotive under-hood use | Choose for non-automotive applications where sub-1.0V VF improves efficiency at light load; no AEC-Q101 assurance |
Compared with VS-4EY50 and MUR450, the SF41G offers identical 50V/4A/35ns specs with AEC-Q101 qualification available (SF41GH), making it the preferred choice for automotive and mission-critical industrial designs requiring validated reliability.
Availability
SF41G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, long-term lifecycle support, and RoHS/halogen-free compliance.
Supply support for SF41G 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 global industrial, computing, and automotive markets since 1979.
The SF41G belongs to TSC's SF4xG super fast rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum junction temperature rating for SF41G?
The SF41G has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings in the official TSC datasheet Version G2105. This allows operation in high-ambient environments such as enclosed power supplies or under-hood automotive modules when paired with appropriate thermal design. The SF41G maintains electrical specifications up to this limit, provided RθJA = 25°C/W is respected in layout.
Is SF41G pin-compatible with standard DO-201AD rectifiers like 1N5822?
Yes, the SF41G uses the industry-standard DO-201AD package with axial leads and cathode band marking, matching mechanical dimensions and lead spacing of 1N5822. However, SF41G is a super fast rectifier (trr = 35ns), whereas 1N5822 is a Schottky diode (no reverse recovery); direct substitution requires circuit-level verification of reverse voltage stress and EMI behavior.
Does SF41G meet automotive reliability standards?
The base SF41G is not AEC-Q101 qualified, but the SF41GH variant - identical electrically and mechanically - is fully AEC-Q101 qualified per Version G2105 documentation. Customers requiring automotive-grade reliability must specify SF41GH; both share the same 50V/4A/35ns specs and DO-201AD packaging.
What is the typical junction capacitance of SF41G and how does it affect high-frequency design?
The SF41G exhibits 100 pF typical junction capacitance (CJ) at 1 MHz and 4.0V reverse bias. This value influences high-frequency switching noise and snubber design - particularly in flyback transformers and resonant LLC circuits. Compared to slower rectifiers with >200 pF CJ, the SF41G's lower capacitance reduces capacitive coupling and improves EMI profile in >200 kHz designs.
How does SF41G's forward voltage compare across temperature and current?
Per TSC's electrical specifications, SF41G's forward voltage is rated at ≤1.0 V at IF = 4A and TJ = 25°C. At elevated junction temperatures (e.g., 125°C), VF decreases slightly due to semiconductor physics, typically reaching ~0.85–0.90 V at 4A - a beneficial characteristic for thermal stability in sustained-load applications using the SF41G.
SF41G R0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 4 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 100pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF41G R0G FAQ
1.How can I place an order for SF41G R0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF41G R0G 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 SF41G R0G reliable?
The price and inventory of SF41G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF41G R0G is usually 5 days.
3.What payment methods are accepted for SF41G R0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF41G R0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF41G R0G?
SF41G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF41G R0G 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 SF41G R0G?
For technical support, including SF41G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF41G R0G requirements.
6.How does Aetrix verify that SF41G R0G is sourced from the original manufacturer or authorized distributors?
All SF41G R0G 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 SF41G R0G meets industry standards.
7.What is the process for return or replacement of SF41G R0G?
All SF41G R0G units undergo pre-shipment inspection (PSI). If there is an issue with SF41G R0G, 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 SF41G R0G part is unused and in its original packaging.
Return procedure for SF41G R0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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