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Diodes Incorporated SF20DG_HF
- Part No.:
- SF20DG_HF
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SF20DG_HF.pdf
- Description:
- Superfast Recovery Rectifier DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,770
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Product details
Overview
SF20DG_HF from Diodes Incorporated is a super fast glass passivated rectifier diode rated for 200 V reverse voltage, 2.0 A average forward current, and 35 ns reverse recovery time, designed for high-frequency switching power supplies, DC-DC converters, and freewheeling applications where low conduction loss and fast recovery are critical.
For engineers reviewing the SF20DG_HF datasheet, SF20DG_HF pinout, SF20DG_HF application, or SF20DG_HF equivalent, key selection criteria include reverse recovery time (trr = 35 ns), forward voltage drop (VF = 0.95 V @ 2.0 A), thermal resistance (RthJA = 35 °C/W), and DO-15 package compatibility with through-hole PCB layouts and automated insertion processes.
Technical Context
This device operates as a unidirectional silicon rectifier with a planar junction structure and glass passivation for enhanced reliability under thermal cycling and humidity stress. Its 35 ns reverse recovery time enables efficient operation in 100–500 kHz SMPS topologies, while the 0.95 V forward voltage at 2.0 A reduces conduction losses in output stage rectification.
The DO-15 package provides mechanical robustness and standardized lead spacing (2.6–3.6 mm diameter leads) for wave soldering and manual assembly. With a maximum junction temperature of +150°C and storage range from –55°C to +150°C, it supports industrial and automotive under-hood environments when derated per I(AV) vs. TA curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum peak reverse voltage before breakdown; defines safe blocking capability in flyback or boost converter secondary side |
| I(AV) | 2.0 A @ TA = 75°C - Continuous DC output current rating with heatsinking via PCB copper; requires minimum 1.5 cm² 2-oz copper pad for thermal compliance |
| VF | 0.95 V @ 2.0 A - Forward voltage drop directly impacts power loss (Ploss ≈ 1.9 W at full load); lower than standard FR series diodes |
| trr | 35 ns - Reverse recovery time measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables stable operation up to ~300 kHz without excessive switching noise |
| IR | 5 µA @ 200 V, 25°C - Low leakage ensures minimal standby power loss in offline AC-DC adapters and energy-efficient standby circuits |
| RthJA | 35 °C/W - Junction-to-ambient thermal resistance on standard FR-4 board; determines required board area and airflow for thermal management |
Pinout & Package
DO-15 molded plastic package with axial leads; cathode indicated by color band. Leads are tin-plated copper, RoHS-compliant and halogen-free. Weight: 0.4 g. Mounting position: any orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node in synchronous rectifier assist) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor positive; must withstand full VRRM during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip | Eliminates moisture-induced degradation and improves long-term reliability in humid or condensing environments |
| Super fast switching (trr = 35 ns) | Reduces switching loss and EMI generation compared to standard recovery rectifiers (e.g., 1N4007 trr > 2 µs) |
| Low VF (0.95 V @ 2.0 A) | Enables higher efficiency in 5–24 V output DC-DC converters where conduction loss dominates total loss budget |
| UL 94V-0 plastic body | Meets flammability requirements for Class II insulated AC-DC power supplies and ITE equipment enclosures |
| Lead-free, RoHS & "Green" compliant | Supports global environmental compliance including EU RoHS 3 and halogen-free mandates (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| Switch-Mode Power Supply Output Rectification | DC-DC Converter Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side rectification in 12 V/2 A offline flyback adapter with 100–250 kHz switching frequency. IC Role / Device Role / Timing Role: Unidirectional current steering and energy transfer during transformer demagnetization phase. Use Value: 35 ns trr minimizes reverse recovery ringing and EMI, while 0.95 V VF keeps conduction loss below 2.0 W at full load. | Use Scenario: Freewheeling path in non-synchronous buck converter supplying FPGA core voltage (1.2 V @ 1.5 A). IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side MOSFET off-time. Use Value: Low RthJA (35 °C/W) and 150°C max TJ enable reliable operation without heatsink in compact 2-layer PCB layout. |
| AC-DC Adapter Standby Rectification | Industrial Sensor Power Supply Input Stage |
Use Scenario: Auxiliary winding rectification in 5 V/0.5 A standby circuit of a 65 W laptop adapter. IC Role / Device Role / Timing Role: Delivers low-power bias supply with minimal no-load loss. Use Value: 5 µA IR at 25°C ensures standby power remains below 1 mW, supporting Energy Star Level VI compliance. | Use Scenario: Input rectification for 24 V DC-powered industrial temperature sensor node with wide ambient range (–40°C to +85°C). IC Role / Device Role / Timing Role: Converts AC ripple from unregulated transformer output to stable DC bus. Use Value: –55°C to +150°C operating range and glass passivation ensure stable performance across thermal shock cycles in factory-floor 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 |
|---|---|---|---|
| STTH2R02 | Same DO-15 package, trr = 30 ns, VF = 0.92 V @ 2 A, but rated for 200 V only and lacks UL 94V-0 certification | Better efficiency at light loads due to lower VF; unsuitable for safety-critical AC-DC designs requiring flame-retardant housing | Select when ultra-low VF is prioritized over safety certification and leakage is not constrained |
| ES2D | DO-214AA (SMA) surface-mount package, trr = 35 ns, VF = 0.92 V @ 2 A, IR = 10 µA @ 200 V | Enables automated reflow assembly and smaller footprint; higher IR increases standby loss in always-on systems | Choose for space-constrained PCBs where reflow compatibility and size outweigh through-hole reliability and lower leakage |
Compared with STTH2R02 and ES2D, SF20DG_HF uniquely combines UL 94V-0 compliance, 5 µA low leakage, and proven DO-15 mechanical robustness-making it optimal for cost-sensitive, safety-certified, through-hole power supplies where thermal margin and long-term stability are design priorities.
Availability
SF20DG_HF is available at Aetrix Electronics and suitable for switch-mode power supply output rectification, DC-DC converter freewheeling, and AC-DC adapter standby circuits requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for SF20DG_HF 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
SF20DG_HF belongs to Diodes' Super Fast Rectifier product line, engineered specifically for high-efficiency, high-frequency AC-DC and DC-DC conversion in consumer, industrial, and computing power supplies.
FAQ
What is the maximum junction temperature and how does it affect layout?
The SF20DG_HF has a maximum junction temperature of +150°C. To maintain reliability, PCB layout must provide adequate copper area (minimum 1.5 cm² of 2-oz copper per lead) and avoid thermal bottlenecks near the DO-15 body. Derating curves in the datasheet show I(AV) drops to 1.4 A at TA = 100°C, so thermal simulation or IR imaging is recommended for enclosed or high-ambient designs.
Is SF20DG_HF suitable for use in automotive applications?
SF20DG_HF meets AEC-Q101 stress test requirements for discrete diodes and operates from –55°C to +150°C, making it suitable for under-dash or engine-compartment-adjacent auxiliary power modules-provided the system-level thermal design maintains junction temperature within limits and the application does not require ASIL-level functional safety validation.
How does its reverse recovery time compare to standard rectifiers like 1N4007?
SF20DG_HF's 35 ns trr is over 50× faster than the 1N4007's typical 2–4 µs recovery time. This eliminates severe switching spikes and EMI in high-frequency converters, avoids cross-conduction in quasi-resonant topologies, and allows direct replacement in legacy designs upgrading from 60 Hz to 100+ kHz operation-without snubber redesign.
Can SF20DG_HF be used in parallel for higher current handling?
Parallel operation is not recommended due to mismatched forward voltage characteristics between units, which causes current imbalance and thermal runaway. For >2.0 A applications, select a single higher-rated device (e.g., SF30DG_HF) or implement active current sharing with external sensing and control-never rely on inherent matching in DO-15 packaged diodes.
SF20DG_HF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- 40pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF20DG_HF FAQ
1.How can I place an order for SF20DG_HF through Aetrix?
Please submit a Request for Quotation (RFQ) for SF20DG_HF 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 SF20DG_HF reliable?
The price and inventory of SF20DG_HF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF20DG_HF is usually 5 days.
3.What payment methods are accepted for SF20DG_HF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF20DG_HF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF20DG_HF?
SF20DG_HF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF20DG_HF 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 SF20DG_HF?
For technical support, including SF20DG_HF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF20DG_HF requirements.
6.How does Aetrix verify that SF20DG_HF is sourced from the original manufacturer or authorized distributors?
All SF20DG_HF 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 SF20DG_HF meets industry standards.
7.What is the process for return or replacement of SF20DG_HF?
All SF20DG_HF units undergo pre-shipment inspection (PSI). If there is an issue with SF20DG_HF, 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 SF20DG_HF part is unused and in its original packaging.
Return procedure for SF20DG_HF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SF20DG_HF Tags
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BAV21W-7-F
Diodes Incorporated
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