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Diodes Incorporated SF30FG-T
- Part No.:
- SF30FG-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF30FG-T.pdf
- Description:
- DIODE GEN PURP 300V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:6,732
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Product details
Overview
SF30FG-T from Diodes Incorporated is a 3.0A, 300V 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-designed for high-efficiency AC/DC front-end rectification in switch-mode power supplies.
For engineers reviewing the SF30FG-T datasheet, SF30FG-T pinout, SF30FG-T application, or SF30FG-T equivalent, key selection criteria include peak repetitive reverse voltage (300V), average forward current (3.0A @ 55°C), thermal resistance (32°C/W), reverse recovery time (35ns), and DO-201AD mechanical compatibility with standard through-hole PCB layouts.
Technical Context
This super-fast rectifier uses a diffused junction and glass passivated die construction to achieve low reverse leakage (5.0μA @ 25°C) and stable switching performance across -65°C to +150°C operating range. Its 35ns trr and 75pF typical capacitance support high-frequency operation up to several hundred kHz in offline SMPS designs.
The device operates under single-phase, half-wave, 60Hz resistive or inductive loads; capacitive loads require 20% current derating. Thermal management relies on lead-to-ambient conduction (RθJA = 32°C/W), with full 3.0A rating maintained only when leads are held at ambient temperature at ≥9.5mm from case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum peak repetitive reverse voltage; defines safe blocking capability in AC line rectification. |
| IO | 3.0 A @ TA = 55°C - Continuous DC output current rating; requires heatsinking or layout optimization above ambient. |
| VFM | 0.95 V @ IF = 3.0A - Forward voltage drop directly impacts conduction loss and thermal rise in power stage. |
| trr | 35 ns - Reverse recovery time determines switching loss and EMI generation in high-frequency converters. |
| IFSM | 125 A - Non-repetitive surge rating; supports inrush current handling during power-up or fault transients. |
| RθJA | 32 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under given power dissipation. |
| IRM | 5.0 μA @ 25°C - Low reverse leakage ensures minimal standby power loss and stable voltage hold-off. |
Pinout & Package
DO-201AD axial-leaded plastic package with cathode band marking; 1.12g mass, UL 94V-0 flammability rating, and tin-plated leads compliant with MIL-STD-202 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC input or transformer secondary; must withstand surge and steady-state current stress. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to bulk capacitor positive or switching node; defines polarity-sensitive placement. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enables reliable high-voltage blocking and moisture resistance without hermetic sealing. |
| Super-fast switching (35ns trr) | Reduces turn-off losses and enables higher-frequency operation than standard rectifiers. |
| 125A surge rating | Withstands cold-start inrush and transient overloads without degradation. |
| Low IRM (5.0μA) | Minimizes leakage-induced power loss and improves efficiency in standby modes. |
| DO-201AD mechanical standardization | Ensures compatibility with legacy automated insertion equipment and board-level thermal relief patterns. |
Applications
| AC/DC Adapter Front-End | Offline SMPS Input Stage |
|---|---|
Use Scenario: Rectifying 50/60Hz AC mains into DC bus for compact wall adapters rated 10–65W. IC Role / Device Role / Timing Role: Primary unidirectional power conversion element; conducts during positive half-cycles and blocks reverse voltage. Use Value: 3.0A rating and 300V VRRM support universal input (85–265VAC) designs with margin; 35ns trr limits switching noise. | Use Scenario: Input rectification in flyback or forward converters for industrial control power supplies. IC Role / Device Role / Timing Role: High-reliability AC line interface component; handles continuous load and surge events per IEC 61000-4-5. Use Value: 125A IFSM and -65°C to +150°C Tj range ensure robustness in harsh environments with wide ambient swings. |
| LED Driver Input Bridge | UPS Charger Input Section |
Use Scenario: Single-diode in bridge-configured LED drivers for streetlight or commercial lighting systems. IC Role / Device Role / Timing Role: Half-wave rectifier in cost-optimized driver topologies where efficiency and size are balanced. Use Value: 0.95V VFM reduces conduction loss versus standard FR107; DO-201AD allows manual or auto-placement in high-volume assembly. | Use Scenario: Mains rectification in online or line-interactive UPS units requiring long service life and thermal stability. IC Role / Device Role / Timing Role: Critical reliability component in battery charging circuitry exposed to frequent grid disturbances. Use Value: Glass passivation and 32°C/W RθJA enable stable operation under sustained 3A load with minimal derating in enclosed enclosures. |
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 | TO-220AC package, 3A/600V, trr = 35ns, VF = 1.15V @ 3A | Higher voltage rating but larger footprint; better thermal dissipation via heatsink | Select when >400V blocking or active cooling is required; not drop-in for DO-201AD layouts. |
| ES3D | SMA package, 3A/200V, trr = 35ns, VF = 0.95V @ 3A, 0.25g weight | Lower VRRM and smaller size; limited surge rating (100A) | Choose for space-constrained designs with ≤200V AC input; verify surge margin in high-line applications. |
Compared with STTH3L06S and ES3D, SF30FG-T uniquely balances 300V blocking, 3.0A current, 35ns speed, and DO-201AD manufacturability-making it optimal for cost-sensitive, medium-power offline supplies where axial lead compatibility and thermal derating control are critical.
Availability
SF30FG-T is available at Aetrix Electronics and suitable for AC/DC adapters, offline SMPS designs, LED driver input stages, and UPS charger circuits requiring stable component supply and long-term production continuity.
Supply support for SF30FG-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.
SF30FG-T belongs to the SF30xG super-fast rectifier family, engineered for high-efficiency, low-loss AC/DC conversion in consumer, industrial, and computing power supplies where fast recovery and thermal robustness are essential.
FAQ
What is the maximum allowable junction temperature for SF30FG-T?
The absolute maximum junction temperature is +150°C, with storage also rated from -65°C to +150°C. Operation at this limit requires strict thermal design: at 3.0A IO, ambient must be ≤55°C and PCB copper area must meet minimum pad/trace requirements per Diodes' layout guidelines to maintain RθJA ≤32°C/W.
Is SF30FG-T RoHS compliant and lead-free?
Yes, SF30FG-T features lead-free finish and complies with RoHS Directive 2011/65/EU (Revision 13.2.2003), including exemption for high-temperature soldering. Tin-plated leads meet MIL-STD-202 Method 208 solderability standards and are compatible with standard reflow and wave-solder processes.
Can SF30FG-T replace SF30DG-T in an existing design?
Yes, with voltage derating consideration: SF30DG-T has 200V VRRM versus SF30FG-T's 300V, so substitution is safe in ≤200V AC applications. However, forward voltage (0.95V vs. 0.95V) and trr (35ns vs. 40ns) are nearly identical, making it a functional upgrade where higher blocking margin is needed.
Why is SF30FG-T marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's internal product lifecycle guidance-not obsolescence. It indicates newer alternatives (e.g., faster, lower-VF, or smaller-package rectifiers) exist, but SF30FG-T remains fully qualified, in production, and supported with no announced discontinuance date or last-time-buy notice.
SF30FG-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 40 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 300 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SF30FG-T FAQ
1.How can I place an order for SF30FG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SF30FG-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 SF30FG-T reliable?
The price and inventory of SF30FG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF30FG-T is usually 5 days.
3.What payment methods are accepted for SF30FG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF30FG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF30FG-T?
SF30FG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF30FG-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 SF30FG-T?
For technical support, including SF30FG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF30FG-T requirements.
6.How does Aetrix verify that SF30FG-T is sourced from the original manufacturer or authorized distributors?
All SF30FG-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 SF30FG-T meets industry standards.
7.What is the process for return or replacement of SF30FG-T?
All SF30FG-T units undergo pre-shipment inspection (PSI). If there is an issue with SF30FG-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 SF30FG-T part is unused and in its original packaging.
Return procedure for SF30FG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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