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Diodes Incorporated SF30DG-B
- Part No.:
- SF30DG-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF30DG-B.pdf
- Description:
- DIODE GEN PURP 200V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:8,132
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Product details
Overview
SF30DG-B from Diodes Incorporated is a 3.0A, 200V glass passivated super-fast 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-efficiency AC/DC front-end rectification in offline switch-mode power supplies.
For engineers reviewing the SF30DG-B datasheet, SF30DG-B pinout, SF30DG-B application, or SF30DG-B equivalent, key selection criteria include VRRM=200V, trr=35ns, VFM=0.95V @3A, IRM=5.0μA @25°C, and thermal resistance RθJA=32°C/W-critical for high-frequency, thermally constrained rectifier designs.
Technical Context
This super-fast rectifier employs a diffused junction and glass passivated die construction to achieve low reverse leakage (5.0μA at 25°C) and fast switching (35ns trr), enabling reduced switching losses in 50–100kHz SMPS topologies. Its DO-201AD package supports lead-free soldering per MIL-STD-202 and UL 94V-0 flammability compliance.
The device operates across –65°C to +150°C with derated current above 55°C ambient (see Fig.1), and exhibits 75pF typical junction capacitance at 1MHz/4V reverse bias-optimized for minimal capacitive loading in high-speed rectifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse blocking voltage; defines safe AC input peak handling in bridge or single-phase rectifiers. |
| IO @ TA=55°C | 3.0 A - Average forward current rating at 55°C ambient; requires heatsinking or airflow above this temperature. |
| trr | 35 ns - Reverse recovery time measured at IF=0.5A, IR=1.0A, Irr=0.25A; enables efficient operation up to ~100kHz switching frequencies. |
| VFM @ IF=3.0A | 0.95 V - Forward voltage drop at rated DC output current; directly impacts conduction loss and thermal design in 12–24V output supplies. |
| IFSM | 125 A - Non-repetitive surge rating for 8.3ms half-sine; withstands inrush currents during cold-start of AC/DC converters. |
| IRM @ 25°C | 5.0 μA - Peak reverse leakage at rated DC blocking voltage; ensures low standby power loss in no-load conditions. |
| RθJA | 32 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area or heatsink for thermal management. |
Pinout & Package
DO-201AD axial-leaded plastic package with cathode band marking; leads are tin-plated, solderable per MIL-STD-202 Method 208, and compliant with RoHS (EU Directive Annex Notes 5 & 7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to AC input or transformer secondary; must handle full load current and surge transients. |
| Cathode | Forward current exit terminal | Connected to bulk capacitor or downstream converter; polarity marked by band on case. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enhances moisture resistance and long-term reliability under humid or thermally cycling environments. |
| Super-fast switching (35ns trr) | Reduces switching loss and EMI generation compared to standard rectifiers in 50–100kHz SMPS designs. |
| 125A surge rating | Supports robust cold-start performance without external fusing in industrial AC/DC adapters and LED drivers. |
| Low VFM (0.95V @3A) | Lowers conduction loss by ~0.3W vs. 1.25V alternatives, improving efficiency and easing thermal design at full load. |
Applications
| AC/DC Power Adapters | LED Driver Front-End |
|---|---|
Use Scenario: 100W universal-input offline flyback adapter for consumer electronics. IC Role / Device Role / Timing Role: Primary-side super-fast rectifier in single-phase bridge configuration. Use Value: 35ns trr minimizes switching loss and improves efficiency over standard FR107, while 0.95V VFM reduces thermal stress on PCB layout. |
Use Scenario: Constant-current LED driver for street lighting operating from 230VAC mains. IC Role / Device Role / Timing Role: Input rectifier stage before PFC controller and buck converter. Use Value: 125A IFSM withstands repeated lamp hot-restrike surges; DO-201AD package allows through-hole mounting on thermally enhanced metal-core PCBs. |
| Industrial SMPS | UPS Rectifier Stage |
Use Scenario: 200W open-frame industrial power supply with wide ambient range (–25°C to +70°C). IC Role / Device Role / Timing Role: High-reliability rectifier in dual-switch forward topology. Use Value: –65°C to +150°C operating range and 5.0μA IRM ensure stable performance in unventilated enclosures. |
Use Scenario: Line-interactive UPS with battery backup and automatic voltage regulation. IC Role / Device Role / Timing Role: Mains rectifier feeding battery charger and inverter DC bus. Use Value: 200V VRRM provides margin against 230VAC line spikes; glass passivation prevents corrosion in dusty, high-humidity data center 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 |
|---|---|---|---|
| STTH3L02 | VRRM=200V, trr=30ns, VFM=0.92V @3A, TO-220AC package | Higher thermal mass but requires mounting hardware; better for >5A continuous designs | Select when higher surge immunity and board-level heatsinking are needed over axial-leaded simplicity. |
| ES3D | VRRM=200V, trr=35ns, VFM=0.95V @3A, DO-204AL (SMA) package | Surface-mount alternative with lower profile and automated assembly compatibility | Choose for space-constrained PCBs where reflow compatibility and smaller footprint outweigh axial lead serviceability. |
Compared with STTH3L02 and ES3D, SF30DG-B offers identical electrical specs in a cost-effective, through-hole DO-201AD package-ideal for prototyping, repair, and medium-volume power supplies where manual assembly or legacy board compatibility is required.
Availability
SF30DG-B is available at Aetrix Electronics and suitable for AC/DC power adapters, LED driver front-ends, and industrial SMPS requiring stable component supply with consistent DO-201AD packaging and RoHS-compliant tin plating.
Supply support for SF30DG-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 and signal integrity solutions for industrial, computing, and consumer markets.
SF30DG-B belongs to the SF30xG super-fast rectifier product line, engineered specifically for high-efficiency, high-frequency AC/DC conversion where low trr and low VFM are critical to system-level thermal and efficiency targets.
FAQ
Is SF30DG-B suitable for use in automotive applications?
No-SF30DG-B is not AEC-Q101 qualified and lacks automotive-grade screening, temperature margin beyond +150°C, or PPAP documentation. It is rated for industrial and commercial use only, with operating range –65°C to +150°C and no guaranteed performance under automotive vibration, humidity, or transient requirements.
What is the maximum allowable PCB trace width for SF30DG-B at 3.0A continuous current?
For 3.0A continuous current with ≤10°C temperature rise, a minimum 2.0mm (78 mil) wide, 2oz copper trace is recommended on external layers. Internal layer traces require ≥3.0mm width due to reduced heat dissipation; thermal vias near pads improve junction-to-PCB conduction.
Does SF30DG-B have a specified junction capacitance at 100kHz?
No-junction capacitance is specified only at 1.0MHz and 4.0V reverse bias (75pF typical). At 100kHz, CT increases significantly due to frequency-dependent depletion region behavior; design should rely on the 1MHz value for EMI filter modeling and avoid extrapolation.
Can SF30DG-B replace SF30AG-B in an existing design?
Yes-both share identical DO-201AD package, thermal characteristics, and pinout. SF30DG-B differs only in VRRM (200V vs. 50V), so replacement is valid only if the circuit's peak reverse voltage does not exceed 200V and the higher trr/VFM of SF30AG-B is not required for low-voltage operation.
SF30DG-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):
- 200 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 @ 200 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
SF30DG-B FAQ
1.How can I place an order for SF30DG-B through Aetrix?
Please submit a Request for Quotation (RFQ) for SF30DG-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 SF30DG-B reliable?
The price and inventory of SF30DG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF30DG-B is usually 5 days.
3.What payment methods are accepted for SF30DG-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF30DG-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF30DG-B?
SF30DG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF30DG-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 SF30DG-B?
For technical support, including SF30DG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF30DG-B requirements.
6.How does Aetrix verify that SF30DG-B is sourced from the original manufacturer or authorized distributors?
All SF30DG-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 SF30DG-B meets industry standards.
7.What is the process for return or replacement of SF30DG-B?
All SF30DG-B units undergo pre-shipment inspection (PSI). If there is an issue with SF30DG-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 SF30DG-B part is unused and in its original packaging.
Return procedure for SF30DG-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SF30DG-B Tags
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