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Diodes Incorporated SF20FG-T
- Part No.:
- SF20FG-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SF20FG-T.pdf
- Description:
- DIODE GEN PURP 300V 2A DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,571
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Product details
Overview
SF20FG-T from Diodes Incorporated is a 2.0A super-fast glass passivated rectifier diode with 300V peak repetitive reverse voltage (VRRM), 0.95V forward voltage at 2.0A, and 35ns reverse recovery time (trr), designed for high-frequency switching power supplies and AC/DC front-end rectification in industrial SMPS.
For engineers reviewing the SF20FG-T datasheet, SF20FG-T pinout, SF20FG-T application, or SF20FG-T equivalent, key selection criteria include VRRM rating, trr performance under 40ns, thermal resistance (RθJA = 40°C/W), surge capability (IFSM = 60A), and DO-15 package compatibility with through-hole PCB layouts.
Technical Context
This device operates as a unidirectional silicon junction rectifier optimized for high-efficiency, high-frequency operation. Its glass passivated die construction ensures stable reverse leakage (IR = 10µA @ 25°C) and robust surge tolerance (60A half-sine, 8.3ms).
The DO-15 package supports lead-free reflow and wave soldering per MIL-STD-202, with cathode band polarity marking and 0.35g mass. Thermal derating follows a defined curve: full 2.0A rating at TA = 75°C, reduced linearly to zero at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum non-repetitive reverse voltage before breakdown; sets safe operating limit in 230VAC-derived DC bus designs. |
| IO | 2.0 A - Average forward current at TA = 75°C; defines continuous conduction capability in rectifier stage. |
| VF @ 2.0A | 0.95 V - Forward voltage drop at rated current; directly impacts conduction loss and thermal design in high-duty-cycle applications. |
| trr | 35 ns - Reverse recovery time measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables operation up to ~3–5 MHz switching frequencies. |
| IFSM | 60 A - Non-repetitive peak surge current (8.3ms half-sine); withstands inrush and transient overloads without failure. |
| RθJA | 40 °C/W - Junction-to-ambient thermal resistance; determines heatsinking requirement for ambient temperatures above 75°C. |
Pinout & Package
Package: DO-15 molded plastic case (UL 94V-0), axial leaded, cathode indicated by band. Weight: 0.35 g. Moisture sensitivity level: MSL 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to AC input or transformer secondary; must handle full 2.0A average and 60A surge currents. |
| Cathode | Forward current exit terminal | Marked with band; connects to output capacitor or DC bus; carries same current as anode with 0.95V drop at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates surface contamination risk and improves long-term reliability under humid or contaminated environments. |
| Super-fast switching (trr = 35 ns) | Reduces switching losses and EMI generation in high-frequency SMPS, enabling smaller filter components. |
| 60A surge rating | Supports cold-start inrush in offline power supplies without requiring oversized parallel devices. |
| Low IR (10 µA @ 25°C) | Minimizes standby power loss in energy-sensitive applications such as no-load or light-load operation. |
Applications
| Industrial Switch-Mode Power Supplies | AC/DC Adapters for Consumer Electronics |
|---|---|
Use Scenario: Rectifying 50/60Hz or high-frequency AC from transformer secondaries in 30–100W open-frame PSUs. IC Role / Device Role / Timing Role: Primary-side unidirectional current path; converts AC to pulsating DC prior to bulk capacitance. Use Value: 35ns trr reduces turn-off loss and snubber stress compared to standard recovery diodes, improving efficiency >2% at 100kHz. |
Use Scenario: Input rectification in compact wall-plug adapters powering routers, set-top boxes, and IoT gateways. IC Role / Device Role / Timing Role: High-reliability discrete rectifier replacing slower alternatives in space-constrained DO-15 footprints. Use Value: 0.95V VF at 2.0A lowers conduction loss versus 1.1V alternatives, reducing thermal rise in sealed enclosures. |
| LED Driver Front-End Rectification | UPS and Battery Charger Input Stages |
Use Scenario: Bridge or single-diode rectification feeding constant-current LED driver ICs in commercial lighting. IC Role / Device Role / Timing Role: Line-frequency rectifier with low leakage ensuring stable bias during dimming cycles. Use Value: 10µA IR at 25°C prevents capacitor discharge drift during PWM dimming pauses, maintaining output stability. |
Use Scenario: Input-stage rectification in line-interactive UPS units and smart battery chargers handling 100–240VAC inputs. IC Role / Device Role / Timing Role: Surge-tolerant rectifier absorbing line transients and battery-reverse protection events. Use Value: 60A IFSM withstands 10× nominal current surges from grid spikes or battery backfeed without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R06U | VRRM = 600V, trr = 30ns, VF = 1.15V @ 2A, TO-220AC package | Higher voltage rating and faster recovery but larger footprint and higher VF; requires heatsink above 1.2A. | Select when >400V blocking is required or board layout allows TO-220 mounting and thermal management. |
| ES2D-E3/57T | VRRM = 200V, trr = 35ns, VF = 0.93V @ 2A, DO-214AA (SMA) package | Lower VRRM, surface-mount, identical trr, slightly lower VF; limited surge rating (IFSM = 50A). | Choose for SMT assembly where 200V rating suffices and space constraints prohibit axial DO-15 placement. |
Compared with STTH2R06U and ES2D-E3/57T, SF20FG-T uniquely balances 300V blocking, 35ns speed, 0.95V conduction, and DO-15 through-hole compatibility-making it optimal for cost-sensitive, medium-voltage, high-reliability rectifier roles where thermal budget and board real estate are constrained.
Availability
SF20FG-T is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, AC/DC adapters, LED driver front-ends, and UPS input stages requiring stable component supply and legacy-design continuity.
Supply support for SF20FG-T 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, high-efficiency power management and signal integrity solutions.
SF20FG-T belongs to the SF20xG super-fast rectifier product line, engineered for high-frequency AC/DC conversion in cost-sensitive industrial and consumer power systems where DO-15 compatibility and surge resilience are critical.
FAQ
Is SF20FG-T still in active production?
No-SF20FG-T is officially obsolete per Diodes Incorporated's DS24013 Rev. 4 (February 2015). It has no designated replacement. Aetrix Electronics maintains limited legacy stock for design continuity and repair programs, with full traceability and RoHS-compliant documentation.
What is the maximum allowable junction temperature for SF20FG-T?
The absolute maximum junction temperature is +150°C. Operation at this limit requires strict thermal design: derated average current to zero at TA = 150°C, and RθJA = 40°C/W assumes 9.5mm lead length at ambient temperature-no heatsink assumed.
Can SF20FG-T be used in a full-wave bridge configuration?
Yes-SF20FG-T is rated for single-phase, half-wave operation per datasheet test conditions, but its 300V VRRM and 60A IFSM make it suitable for use in discrete full-wave bridges. Each diode sees ≤ VRRM/√2 in typical configurations, well within its 300V rating for 230VAC inputs.
How does SF20FG-T compare to standard recovery rectifiers like 1N4007?
SF20FG-T offers 35ns reverse recovery versus 30µs for 1N4007-nearly 1000× faster-enabling efficient operation above 20kHz. Its 0.95V VF is comparable, but its 60A surge rating exceeds 1N4007's 30A, making it suitable for modern high-frequency, high-reliability power conversion.
SF20FG-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 40 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 300 V
- Capacitance @ Vr, F:
- 75pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
- Operating Temperature - Junction:
- -65°C ~ 150°C
SF20FG-T FAQ
1.How can I place an order for SF20FG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SF20FG-T 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 SF20FG-T reliable?
The price and inventory of SF20FG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF20FG-T is usually 5 days.
3.What payment methods are accepted for SF20FG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF20FG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF20FG-T?
SF20FG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF20FG-T 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 SF20FG-T?
For technical support, including SF20FG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF20FG-T requirements.
6.How does Aetrix verify that SF20FG-T is sourced from the original manufacturer or authorized distributors?
All SF20FG-T 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 SF20FG-T meets industry standards.
7.What is the process for return or replacement of SF20FG-T?
All SF20FG-T units undergo pre-shipment inspection (PSI). If there is an issue with SF20FG-T, 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 SF20FG-T part is unused and in its original packaging.
Return procedure for SF20FG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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