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Diodes Incorporated SF30AG-B
- Part No.:
- SF30AG-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF30AG-B.pdf
- Description:
- DIODE GEN PURP 50V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,126
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Product details
Overview
SF30AG-B from Diodes Incorporated is a 3.0A, 50V peak repetitive reverse voltage 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 - deployed in high-frequency AC/DC adapters and switch-mode power supplies.
For engineers reviewing the SF30AG-B datasheet, SF30AG-B pinout, SF30AG-B application, or SF30AG-B equivalent, key selection criteria include fast recovery performance under 60Hz/switching loads, thermal resistance of 32°C/W, low leakage (5.0µA @ 25°C), and DO-201AD mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
This super-fast rectifier uses a diffused junction and glass passivated die construction to achieve rapid carrier recombination, enabling efficient operation in high-frequency switching converters up to several hundred kHz. Its 35ns trr and low 75pF capacitance minimize switching losses and EMI generation.
The device operates across –65°C to +150°C with cathode-band polarity marking and tin-plated leads compliant with MIL-STD-202 solderability. Derating applies for capacitive loads (–20% current) and ambient temperatures above 55°C per the forward current derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum peak reverse voltage before breakdown; sets safe operating limit in bridge or output rectification stages. |
| IO @ TA=55°C | 3.0 A - Average forward current rating at 55°C ambient; requires heatsinking or layout cooling above this temperature. |
| VFM @ IF=3.0A | 0.95 V - Forward voltage drop defining conduction loss; contributes ~2.85W dissipation at full load. |
| trr | 35 ns - Reverse recovery time determining minimum off-time in PWM circuits; enables >100kHz switching without excessive ringing. |
| IFSM | 125 A - Non-repetitive surge rating for 8.3ms half-sine; withstands inrush currents in offline SMPS input stages. |
| IRM @ 25°C | 5.0 µA - Reverse leakage at rated DC blocking voltage; ensures minimal standby power loss in high-impedance bias networks. |
| RθJA | 32 °C/W - Junction-to-ambient thermal resistance; defines temperature rise per watt under natural convection on standard FR-4 PCB. |
Pinout & Package
DO-201AD axial-leaded plastic package with cathode band marking; 1.12g mass; UL 94V-0 flammability rating; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry point | Connected to AC source or transformer secondary; must handle full 3.0A average current and 125A surge peaks. |
| Cathode (Lead 2, banded end) | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor; reverse-biased during off-cycle; blocks up to 50V peak. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enables stable long-term reliability and humidity resistance without hermetic sealing; qualified per J-STD-020C Level 1. |
| Super-fast switching (35ns trr) | Reduces turn-off losses and EMI in high-frequency rectification, supporting compact magnetics in <500kHz SMPS designs. |
| 125A surge rating | Withstands cold-start inrush into bulk capacitors without degradation - critical for universal-input AC/DC front-ends. |
| Low VF (0.95V @ 3A) | Lowers conduction loss by ~15% vs. standard fast rectifiers, improving efficiency in 5–24V output adapters. |
Applications
| AC/DC Adapter Output Rectification | Switch-Mode Power Supply Output Stage |
|---|---|
Use Scenario: Converting high-frequency transformer output to regulated DC in wall-wart adapters (e.g., 12V/2A). IC Role / Device Role / Timing Role: Output rectifier conducting during transformer secondary positive half-cycle; synchronized to PWM frequency. Use Value: 35ns trr minimizes voltage overshoot and snubber losses, enabling smaller RCD clamp components and higher efficiency at 65–130kHz. |
Use Scenario: Secondary-side rectification in isolated flyback or forward converters for industrial control modules. IC Role / Device Role / Timing Role: Uncontrolled rectifier in low-cost, fixed-output SMPS where synchronous FETs are not used. Use Value: 0.95V VF reduces heat generation versus 1.1V alternatives, allowing use without heatsink in 3A/12V designs with 20mm² copper pour. |
| Input Bridge Rectifier (Low-Voltage) | DC Link Protection in Motor Drives |
Use Scenario: Single-phase bridge rectification for 24VAC control circuitry in HVAC actuators. IC Role / Device Role / Timing Role: One leg of four-diode bridge converting 24VAC to pulsating DC; conducts 50/60Hz half-cycles. Use Value: 50V VRRM provides 2× safety margin over 24VAC RMS; glass passivation prevents corrosion in humid environments. |
Use Scenario: Freewheeling path for inductive kickback in 24V brushed DC motor H-bridge drivers. IC Role / Device Role / Timing Role: Clamp diode across motor winding; conducts only during MOSFET turn-off transients. Use Value: 125A IFSM absorbs 10ms inductive spikes without failure; 32°C/W RθJA allows direct PCB mounting near motor driver IC. |
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 | 600V VRRM, 3.0A IO, 50ns trr, TO-220AC package | Higher voltage rating but slower recovery; requires heatsink mounting | Select when system requires >50V blocking or higher surge immunity; avoid if board space or thermal budget is constrained. |
| ES3D-E3/54 | 200V VRRM, 3.0A IO, 35ns trr, DO-204AL (SMA) package | Same speed, lower voltage, surface-mount footprint | Choose for automated assembly or space-constrained designs; verify 200V rating suffices for your AC line variation. |
Compared with STTH3L06S and ES3D-E3/54, SF30AG-B offers optimal balance of 50V rating, 35ns speed, and DO-201AD through-hole robustness - ideal for cost-sensitive, medium-power adapter designs where leaded reliability and manual rework access matter.
Availability
SF30AG-B is available at Aetrix Electronics and suitable for AC/DC adapters, switch-mode power supplies, and motor drive freewheeling circuits requiring stable component supply and legacy through-hole compatibility.
Supply support for SF30AG-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-efficiency power management and signal integrity solutions for industrial, computing, and consumer markets.
SF30AG-B belongs to Diodes' super-fast rectifier product line, engineered for high-frequency switching power conversion where low VF, fast trr, and rugged surge capability are essential in cost-optimized designs.
FAQ
Is SF30AG-B RoHS compliant?
Yes, SF30AG-B features lead-free finish and complies with RoHS Directive 2011/65/EU (Revision 13.2.2003), including exemption for high-temperature soldering per EU Annex Notes 5 and 7. Tin-plated leads meet MIL-STD-202 Method 208 solderability requirements.
What is the maximum operating temperature for SF30AG-B?
SF30AG-B has an operating junction temperature range of –65°C to +150°C. At ambient temperatures above 55°C, the average forward current must be derated per Figure 1; full 3.0A is only rated at TA = 55°C with leads held at ambient within 9.5mm of the case.
Can SF30AG-B replace a standard FR304?
No - SF30AG-B (50V, 35ns) is not a direct replacement for FR304 (400V, 500ns). While both are 3A DO-201AD rectifiers, SF30AG-B's lower VRRM and faster trr make it unsuitable for 400V applications; using it there risks catastrophic reverse breakdown.
Why is SF30AG-B marked "Not Recommended for New Design"?
Diodes Incorporated issued this notice due to obsolescence planning - newer devices like the SB350 or AP30D series offer improved VF, trr, and packaging options. SF30AG-B remains fully functional and supported for existing designs, but new projects should evaluate modern alternatives for long-term supply assurance.
SF30AG-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):
- 50 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 @ 50 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
SF30AG-B FAQ
1.How can I place an order for SF30AG-B through Aetrix?
Please submit a Request for Quotation (RFQ) for SF30AG-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 SF30AG-B reliable?
The price and inventory of SF30AG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF30AG-B is usually 5 days.
3.What payment methods are accepted for SF30AG-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF30AG-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF30AG-B?
SF30AG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF30AG-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 SF30AG-B?
For technical support, including SF30AG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF30AG-B requirements.
6.How does Aetrix verify that SF30AG-B is sourced from the original manufacturer or authorized distributors?
All SF30AG-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 SF30AG-B meets industry standards.
7.What is the process for return or replacement of SF30AG-B?
All SF30AG-B units undergo pre-shipment inspection (PSI). If there is an issue with SF30AG-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 SF30AG-B part is unused and in its original packaging.
Return procedure for SF30AG-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SF30AG-B Tags
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