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Diodes Incorporated SF30FG-B
- Part No.:
- SF30FG-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF30FG-B.pdf
- Description:
- DIODE GEN PURP 300V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:3,006
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Product details
Overview
SF30FG-B from Diodes Incorporated is a 3.0A, 300V super-fast glass passivated rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 0.95V forward voltage at 3.0A, and 125A non-repetitive surge rating-designed for high-frequency switching power supplies and AC/DC front-end rectification.
For engineers reviewing the SF30FG-B datasheet, SF30FG-B pinout, SF30FG-B application, or SF30FG-B equivalent, key selection criteria include peak repetitive reverse voltage (300V), fast recovery performance (35ns), thermal resistance (32°C/W), low leakage (<5.0µA @ 25°C), and DO-201AD mechanical compatibility in compact power conversion designs.
Technical Context
This super-fast rectifier uses a diffused junction and glass passivated die construction to achieve low reverse leakage and stable high-speed switching. Its 35ns reverse recovery time (measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A) enables efficient operation in 50–100kHz SMPS topologies.
The device supports single-phase, half-wave rectification with 3.0A average output current at TA = 55°C, derated linearly above that ambient. Thermal resistance of 32°C/W (junction-to-ambient, lead length 9.5mm) defines its power dissipation limits under natural convection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Peak repetitive reverse voltage; sets maximum AC input or DC bus blocking capability |
| IO | 3.0 A @ TA = 55°C - Continuous rectified current rating; requires heatsinking or airflow above 55°C ambient |
| VFM | 0.95 V @ IF = 3.0A - Forward voltage drop; determines conduction loss and thermal load in high-current paths |
| trr | 35 ns - Reverse recovery time; critical for minimizing switching losses and EMI in high-frequency converters |
| IFSM | 125 A (8.3ms half-sine) - Surge withstand capability; handles inrush and transient overloads without failure |
| IRM | 5.0 µA @ 25°C - Reverse leakage current; ensures low standby power loss in high-impedance bias networks |
| RθJA | 32 °C/W - Junction-to-ambient thermal resistance; defines temperature rise per watt under standard mounting |
Pinout & Package
DO-201AD molded plastic package with axial leads, cathode band marking, tin-plated solderable terminals, and UL 94V-0 flammability rating. Weight: 1.12 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry point | Connected to AC input or transformer secondary; must handle full surge current path |
| Cathode (Lead 2, banded end) | Forward current exit / reverse blocking terminal | Connected to output capacitor or DC bus; polarity-sensitive for correct rectification |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die construction | Enhances moisture resistance and long-term reliability in humid or thermally cycling environments |
| Super-fast switching (35ns trr) | Reduces switching losses and improves efficiency in 50–200kHz flyback and forward converters |
| 125A surge rating (8.3ms) | Withstands cold-start inrush and line transients without degradation in industrial power supplies |
| Low reverse leakage (5.0µA @ 25°C) | Minimizes standby power loss and prevents unintended biasing in high-impedance control circuits |
| DO-201AD mechanical standardization | Enables drop-in replacement and automated through-hole assembly with legacy rectifier footprints |
Applications
| Switch-Mode Power Supply Input Stage | AC/DC Adapter Rectification |
|---|---|
Use Scenario: Single-phase, 50/60Hz AC input rectification feeding a 65–100kHz flyback converter in open-frame power supplies. IC Role / Device Role / Timing Role: Primary-side unidirectional current steering and DC bus formation; operates at line frequency but impacts high-frequency switching loss via trr. Use Value: 35ns trr reduces turn-off tail current, lowering EMI generation and improving power stage efficiency by ~0.8% vs. standard fast rectifiers. | Use Scenario: Compact wall-mount AC/DC adapters for consumer electronics requiring <15W output and low no-load consumption. IC Role / Device Role / Timing Role: Bridge or single-diode rectifier in voltage-doubler or half-wave configuration; subjected to repeated thermal cycling and surge stress. Use Value: 125A IFSM and 5.0µA IRM ensure robust startup behavior and minimal standby leakage, meeting Energy Star Level VI requirements. |
| Industrial Motor Drive Snubber Network | LED Driver Bulk Rectification |
Use Scenario: Freewheeling and snubber path in 3-phase IGBT inverter modules for HVAC blowers and pump controllers. IC Role / Device Role / Timing Role: Clamp diode in RC snubber circuit; conducts brief high-di/dt pulses during IGBT turn-off transitions. Use Value: 32°C/W RθJA and glass passivation allow reliable operation at 105°C case temperature in enclosed enclosures without forced cooling. | Use Scenario: Bulk rectification stage in constant-current LED drivers for street lighting and commercial fixtures (20–50W). IC Role / Device Role / Timing Role: High-efficiency DC bus generator feeding buck or buck-boost LED controller ICs; operates continuously at elevated ambient. Use Value: 0.95V VFM at 3.0A reduces conduction loss by 120mW vs. 1.07V alternatives, directly improving thermal margin and lumen maintenance. |
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 | Same 3.0A/600V rating, but 50ns trr and higher VFM (1.15V); TO-220AC package | Requires PCB footprint change and heatsink mounting; better suited for higher-voltage, lower-frequency designs | Select when >400V blocking is needed and board space allows TO-220; avoid if trr <40ns is required |
| ES3D-E3/57T | 3.0A/200V, 35ns trr, same DO-201AD package, but 1.3V VFM and 50µA IRM at 25°C | Compatible footprint and layout; acceptable where 200V rating suffices and higher leakage is tolerable | Use for cost-sensitive 115VAC-only systems; not suitable for universal-input (100–240VAC) designs |
Compared with STTH3L06S and ES3D-E3/57T, SF30FG-B uniquely balances 300V rating, 35ns speed, and 0.95V conduction loss in DO-201AD-making it optimal for universal-input, high-density 30–65W SMPS where thermal and EMI constraints are tight.
Availability
SF30FG-B is available at Aetrix Electronics and suitable for switch-mode power supply input stages, AC/DC adapter rectification, industrial motor drive snubber networks, and LED driver bulk rectification requiring stable component supply and long-term manufacturing continuity.
Supply support for SF30FG-B 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
SF30FG-B belongs to the SF30xG super-fast rectifier product line, engineered specifically for high-efficiency, high-frequency AC/DC conversion where low trr, controlled VFM, and rugged surge capability are essential.
FAQ
Is SF30FG-B RoHS compliant and lead-free?
Yes, SF30FG-B features a lead-free finish and is RoHS compliant per Directive 2011/65/EU Annex II, with high-temperature solder exemption applied per EU Directive Annex Notes 5 and 7. Terminal plating meets MIL-STD-202, Method 208 for solderability.
What is the maximum operating temperature for SF30FG-B?
SF30FG-B has an operating junction temperature range of –65°C to +150°C. The maximum ambient temperature for 3.0A average current is 55°C; derating curves in the datasheet show linear reduction to zero current at 150°C ambient under specified mounting conditions.
Can SF30FG-B replace SF30DG-B in a design?
Yes, SF30FG-B can replace SF30DG-B in most applications, as both share identical package, pinout, and thermal characteristics. The key difference is VRRM: SF30DG-B is rated for 200V, while SF30FG-B is rated for 300V-providing higher safety margin in universal-input or high-line designs.
Does SF30FG-B require a heatsink in typical applications?
No external heatsink is required for SF30FG-B at ≤3.0A average current and ≤55°C ambient, provided leads are maintained at ambient temperature at 9.5mm from the case per datasheet condition. At higher ambient or continuous >2.0A, PCB copper area or airflow should be increased to manage 32°C/W RθJA.
SF30FG-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 40 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 300 V
- Capacitance @ Vr, F:
- 75pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SF30FG-B FAQ
1.How can I place an order for SF30FG-B through Aetrix?
Please submit a Request for Quotation (RFQ) for SF30FG-B 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 SF30FG-B reliable?
The price and inventory of SF30FG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF30FG-B is usually 5 days.
3.What payment methods are accepted for SF30FG-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF30FG-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF30FG-B?
SF30FG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF30FG-B 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 SF30FG-B?
For technical support, including SF30FG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF30FG-B requirements.
6.How does Aetrix verify that SF30FG-B is sourced from the original manufacturer or authorized distributors?
All SF30FG-B 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 SF30FG-B meets industry standards.
7.What is the process for return or replacement of SF30FG-B?
All SF30FG-B units undergo pre-shipment inspection (PSI). If there is an issue with SF30FG-B, 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 SF30FG-B part is unused and in its original packaging.
Return procedure for SF30FG-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SF30FG-B Tags
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