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Taiwan Semiconductor Corporation SF31G B0G
- Part No.:
- SF31G B0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF31G B0G.pdf
- Description:
- DIODE GEN PURP 50V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,817
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Product details
Overview
SF31G B0G from Taiwan Semiconductor is a 3A, 50V 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 current capability; used in DC-DC converters and freewheeling paths in automotive-grade power supplies.
For engineers reviewing the SF31G B0G datasheet, SF31G B0G pinout, SF31G B0G application, or SF31G B0G equivalent, key selection criteria include VRRM = 50V, IF = 3A, trr = 35ns, thermal resistance RθJL = 10°C/W, and AEC-Q101 qualification status (B0G suffix denotes standard grade, not AEC-Q101).
Technical Context
The SF31G B0G is a single-die, planar junction super fast rectifier optimized for high-frequency switching applications. Its 35ns reverse recovery time and low 0.95V forward voltage at rated current minimize conduction and switching losses in SMPS topologies.
Thermal performance is defined by RθJL = 10°C/W and RθJA = 35°C/W, enabling reliable operation up to TJ = 150°C. The DO-201AD package supports lead-free soldering per J-STD-002 and meets UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; sets minimum isolation margin in 24–48V input DC-DC stages |
| IF | 3 A - Continuous average forward current; defines steady-state power handling in freewheeling diode position |
| trr | 35 ns - Reverse recovery time at IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables stable operation up to ~500 kHz switching frequency |
| VF | 0.95 V @ 3A, 25°C - Forward voltage drop; determines conduction loss of 2.85W at full load, critical for thermal design |
| RθJL | 10 °C/W - Junction-to-lead thermal resistance; allows direct heatsinking via PCB copper pour or lead frame in TO-220-equivalent layouts |
| IFSM | 125 A - Non-repetitive surge current (8.3ms half-sine); withstands inrush and fault transients in industrial power rails |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated and solderable per J-STD-002. Device polarity is unidirectional: anode and cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck freewheel path or transformer secondary center-tap) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to output rail or positive bus; blocks 50V reverse during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery | trr = 35 ns enables high-frequency (>300 kHz) SMPS designs with minimal switching loss and EMI |
| Low forward voltage | VF = 0.95 V @ 3A reduces conduction loss by ~15% vs. standard FR series at same current |
| High surge robustness | IFSM = 125 A supports repeated cold-start and short-circuit events without degradation |
| RoHS & halogen-free | Complies with IEC 61249-2-21; suitable for automotive and industrial assemblies requiring green material compliance |
Applications
| DC-DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side rectification in isolated 24V–48V input buck-derived DC-DC modules for telecom and industrial PLCs. IC Role / Device Role / Timing Role: Freewheeling diode conducting during high-side switch off-time; clamps inductive kickback and recirculates energy. Use Value: 35ns trr prevents reverse recovery tail current overlap with next switching cycle, reducing shoot-through risk and MOSFET stress. | Use Scenario: Output stage anti-parallel diode in half-bridge motor drive inverters for HVAC blowers and pump controllers. IC Role / Device Role / Timing Role: Bidirectional current path for inductive load current commutation during PWM dead-time intervals. Use Value: 0.95V VF limits conduction loss to ≤2.85W at 3A, easing thermal management on compact PCBs. |
| Automotive Power Supplies | Industrial Freewheeling |
Use Scenario: Input rectification in 12V battery-fed auxiliary power modules meeting ISO 7637-2 pulse immunity. IC Role / Device Role / Timing Role: Primary rectifier converting alternator AC to regulated 12V DC; handles load dump transients up to 125A surge. Use Value: 125A IFSM and 150°C TJmax ensure reliability under automotive transient conditions without derating. | Use Scenario: Snubberless flyback diode across solenoid valves and relay coils in factory automation I/O modules. IC Role / Device Role / Timing Role: Suppresses inductive voltage spikes during coil de-energization; conducts brief high-current reverse recovery tail. Use Value: 35ns trr minimizes voltage overshoot and EMI generation compared to standard recovery diodes (>500ns). |
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 | VRRM = 60V, trr = 30ns, VF = 0.92V @ 3A - slightly faster and lower VF, but higher cost and different DO-201AD footprint tolerance | Preferred in noise-sensitive 48V telecom PSUs where <30ns trr reduces EMI filter size | Select STTH3L06S when 30ns trr and tighter VF tolerance are required; verify lead coplanarity for automated assembly |
| ES3D | VRRM = 200V, trr = 35ns, VF = 0.92V @ 3A - higher voltage rating, same speed, lower VF, but not AEC-Q101 qualified | Suitable for universal-input offline adapters where 200V VRRM provides margin over 170V peak line | Choose ES3D for non-automotive 100–240VAC input designs needing wider VRRM margin; SF31G B0G remains optimal for 50V-specific systems |
Compared with STTH3L06S and ES3D, the SF31G B0G offers precise 50V VRRM headroom for 24–36V systems, consistent 35ns trr, and DO-201AD compatibility with legacy production tooling - making it ideal for cost-sensitive, volume automotive and industrial power supply replacements.
Availability
SF31G B0G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial freewheeling applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for SF31G 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 power rectifiers, TVS devices, and protection ICs since 1979.
The SF31G B0G belongs to TSC's SF3xG super fast rectifier family, engineered for high-efficiency, high-reliability power conversion in automotive and industrial environments where fast recovery, low loss, and thermal robustness are mandatory.
FAQ
What is the maximum junction temperature rating for SF31G B0G?
The SF31G B0G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows continuous operation in high-ambient environments such as engine bay power modules or enclosed industrial enclosures, provided thermal design maintains TJ ≤ 150°C using RθJL = 10°C/W data.
Does SF31G B0G meet AEC-Q101 reliability standards?
No, SF31G B0G does not meet AEC-Q101. The "B0G" suffix indicates standard commercial/industrial grade; AEC-Q101 qualified versions are marked with "H" (e.g., SF31GH). SF31G B0G is suitable for non-automotive applications or automotive subsystems not requiring AEC-Q101 certification.
What is the reverse recovery time (trr) test condition for SF31G B0G?
The reverse recovery time trr = 35 ns for SF31G B0G is measured under the condition: IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A, per the Electrical Specifications table. This reflects real-world switching behavior in hard-commutated circuits like buck converters and motor drives.
Is SF31G B0G RoHS and halogen-free compliant?
Yes, SF31G B0G is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and the pure tin-plated leads meet J-STD-002 solderability requirements - supporting green manufacturing and end-of-life recycling.
What package type and marking does SF31G B0G use?
SF31G B0G uses the DO-201AD axial package with cathode band polarity marking. The device marking reads "SF31G" followed by date code and factory identifier; "B0G" is the ordering suffix indicating tape-and-reel packaging (1250 pcs/reel) and standard grade - not part of the visible marking on the body.
SF31G 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):
- 50 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 @ 50 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
SF31G B0G FAQ
1.How can I place an order for SF31G B0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF31G 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 SF31G B0G reliable?
The price and inventory of SF31G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF31G B0G is usually 5 days.
3.What payment methods are accepted for SF31G B0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF31G B0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF31G B0G?
SF31G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF31G 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 SF31G B0G?
For technical support, including SF31G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF31G B0G requirements.
6.How does Aetrix verify that SF31G B0G is sourced from the original manufacturer or authorized distributors?
All SF31G 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 SF31G B0G meets industry standards.
7.What is the process for return or replacement of SF31G B0G?
All SF31G B0G units undergo pre-shipment inspection (PSI). If there is an issue with SF31G 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 SF31G B0G part is unused and in its original packaging.
Return procedure for SF31G B0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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