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Diodes Incorporated SF20AG-T
- Part No.:
- SF20AG-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SF20AG-T.pdf
- Description:
- DIODE GEN PURP 50V 2A DO15
- Quantity:
- Payment:
- Shipping:
Inventory:9,844
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Product details
Overview
SF20AG-T from Diodes Incorporated is a 2.0A, 50V peak repetitive reverse voltage super-fast glass passivated rectifier diode in DO-15 package, with 35ns reverse recovery time, 0.95V forward voltage at 2.0A, and 10µA reverse leakage at 25°C, used in high-efficiency AC/DC front-end rectification for offline switch-mode power supplies.
For engineers reviewing the SF20AG-T datasheet, SF20AG-T pinout, SF20AG-T application, or SF20AG-T equivalent, key selection criteria include fast recovery performance under 60Hz/400Hz line-frequency switching, low conduction loss at 2A DC output, thermal derating above 75°C ambient, and compatibility with DO-15 PCB footprints in compact power adapters and industrial AC-DC modules.
Technical Context
This super-fast rectifier employs glass passivated junction technology to achieve stable reverse blocking and reduced minority carrier lifetime, enabling sub-50ns trr without soft-recovery trade-offs. Its 60A non-repetitive surge rating supports inrush current handling in unregulated input stages.
The device operates across –65°C to +150°C junction temperature range with 40°C/W junction-to-ambient thermal resistance, requiring minimum 9.5mm lead length at ambient for full 2.0A average current rating under 75°C ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; sets minimum insulation margin for 36V RMS input designs. |
| IO @ TA=75°C | 2.0 A - Continuous DC output current capability when leads are held at ambient at ≥9.5 mm from case body. |
| trr | 35 ns - Measured at IF=0.5A, IR=1.0A, Irr=0.25A; enables efficient operation up to ~200 kHz switching in quasi-resonant converters. |
| VFM @ IF=2.0A | 0.95 V - Forward conduction loss contributes ≤1.9W dissipation at full load, critical for thermal management in enclosed adapters. |
| IRM @ 25°C | 10 µA - Low leakage preserves efficiency in high-impedance bias networks and reduces standby power in no-load conditions. |
| RθJA | 40 °C/W - Thermal resistance defines required copper area and airflow for maintaining Tj ≤150°C at rated load. |
Pinout & Package
DO-15 axial-leaded plastic package with cathode band marking; 0.35g mass, UL 94V-0 flammability rating, and tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | AC Input / Positive Conduction Path | Connects to transformer secondary or bridge input; carries full forward current during positive half-cycle. |
| Cathode (Lead 2, banded end) | DC Output / Negative Return Path | Delivers rectified output to bulk capacitor; polarity marking ensures correct orientation in series/parallel configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die construction | Enables stable long-term reverse leakage performance and humidity resistance without silicone gel encapsulation. |
| Super-fast switching (35ns trr) | Reduces switching losses in high-frequency flyback and forward converters compared to standard recovery rectifiers. |
| 60A surge rating (8.3ms half-sine) | Withstands cold-start inrush into large input capacitors without degradation in 115/230VAC universal-input applications. |
| Low 0.95V forward drop at 2A | Lowers conduction loss by ~15% versus comparable 1N4007-based designs, improving adapter efficiency at full load. |
Applications
| AC-DC Power Adapters | Industrial Control Power Supplies |
|---|---|
Use Scenario: 5–24V, 1–3A wall-mounted AC-DC adapters for networking equipment and IoT gateways. IC Role / Device Role / Timing Role: Primary-side output rectifier in discontinuous conduction mode (DCM) flyback topology. Use Value: 35ns trr minimizes reverse recovery ringing and EMI generation, easing EMC filter design and reducing snubber losses. | Use Scenario: 24V/2A auxiliary power supply in PLC I/O modules operating in –40°C to +70°C ambient. IC Role / Device Role / Timing Role: Input rectifier feeding linear regulator or buck converter for isolated logic rails. Use Value: –65°C to +150°C operating range and 10µA IRM ensure reliable startup and low standby drain across extended temperature extremes. |
| LED Driver Secondary Rectification | UPS Battery Charger Front-End |
Use Scenario: Constant-current LED drivers for commercial lighting with 12–48V output and 1–2A output current. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement in low-cost flyback designs where MOSFET control is omitted. Use Value: 0.95V VFM directly improves system efficiency by 2–3% over 1N5822 Schottky alternatives at >60°C junction temperature. | Use Scenario: 12V/2A battery charger stage in line-interactive UPS systems with automatic transfer switching. IC Role / Device Role / Timing Role: Full-wave rectifier in transformer-coupled charging circuit subjected to frequent AC dropout and reapplication. Use Value: 60A IFSM withstands repeated 100ms surges during utility switchover events without parametric shift or bond-wire fusing. |
Availability
SF20AG-T is available at Aetrix Electronics and suitable for AC-DC power adapters, industrial control power supplies, LED driver secondary rectification, and UPS battery charger front-end applications requiring stable component supply despite product discontinuation status.
Supply support for SF20AG-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 power management, signal integrity, and protection solutions for industrial and consumer markets.
SF20AG-T belongs to the SF20xG super-fast rectifier product line, engineered for high-efficiency, cost-sensitive AC/DC conversion where fast recovery and robust surge tolerance outweigh ultra-low VF requirements.
FAQ
Is SF20AG-T still in active production?
No. Diodes Incorporated declared SF20AG-T obsolete in February 2015 (DS24013 Rev. 4-4), with no replacement part offered. Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and RoHS-compliant documentation per original specification.
What is the maximum allowable junction temperature for SF20AG-T?
The absolute maximum junction temperature is +150°C, as specified in the datasheet. Sustained operation above this limit risks permanent degradation of the glass-passivated junction and increased reverse leakage. Derating curves require lead temperature maintenance at ambient beyond 9.5mm to sustain 2.0A IO at 75°C ambient.
Can SF20AG-T replace 1N4007 in high-frequency applications?
Yes - but only where fast recovery is required. SF20AG-T's 35ns trr and 0.95V VFM outperform 1N4007's 30µs trr and 1.1V VFM, making it suitable for flyback converters switching above 50kHz. However, its lower 50V VRRM limits use to ≤36V RMS inputs, unlike 1N4007's 1000V rating.
What does "SF20AG-T" suffix "-T" indicate?
The "-T" suffix denotes tape-and-reel packaging: 4,000 units per 13-inch reel, optimized for automated SMT placement despite the DO-15 axial-leaded form factor. This packaging format enables consistent feed reliability in high-volume power supply assembly lines.
SF20AG-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):
- 50 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:
- 10 µA @ 50 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
SF20AG-T FAQ
1.How can I place an order for SF20AG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SF20AG-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 SF20AG-T reliable?
The price and inventory of SF20AG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF20AG-T is usually 5 days.
3.What payment methods are accepted for SF20AG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF20AG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF20AG-T?
SF20AG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF20AG-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 SF20AG-T?
For technical support, including SF20AG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF20AG-T requirements.
6.How does Aetrix verify that SF20AG-T is sourced from the original manufacturer or authorized distributors?
All SF20AG-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 SF20AG-T meets industry standards.
7.What is the process for return or replacement of SF20AG-T?
All SF20AG-T units undergo pre-shipment inspection (PSI). If there is an issue with SF20AG-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 SF20AG-T part is unused and in its original packaging.
Return procedure for SF20AG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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