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Diodes Incorporated SF30DG-T
- Part No.:
- SF30DG-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF30DG-T.pdf
- Description:
- DIODE GEN PURP 200V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:4,053
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Product details
Overview
SF30DG-T from Diodes Incorporated is a 200 V, 3.0 A glass passivated super-fast rectifier diode in DO-201AD package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 3.0 A, and 125 A non-repetitive surge capability - used in high-frequency switch-mode power supplies and AC/DC adapters.
For engineers reviewing the SF30DG-T datasheet, SF30DG-T pinout, SF30DG-T application, or SF30DG-T equivalent, key selection criteria include peak repetitive reverse voltage (200 V), average rectified current (3.0 A @ 55°C), reverse recovery time (35 ns), forward voltage drop (0.95 V), and thermal resistance (32 °C/W) for thermal design validation and efficiency optimization.
Technical Context
This super-fast rectifier employs a diffused junction and glass passivated die construction to achieve low reverse leakage (5.0 µA @ 25°C) and stable switching performance under high dv/dt conditions. Its 35 ns trr enables operation in 100–500 kHz SMPS topologies without excessive switching loss.
The device is rated for single-phase half-wave 60 Hz resistive/inductive loads, with derating required for capacitive loads (−20% current). Thermal design must account for 32 °C/W junction-to-ambient resistance and 1.12 g mass for PCB thermal relief layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin in 170 VAC-derived DC bus designs. |
| IO @ TA=55°C | 3.0 A - Continuous average forward current with leads held at ambient at 9.5 mm from case; defines usable output capacity in convection-cooled adapters. |
| VFM @ IF=3.0A | 0.95 V - Forward voltage drop at rated current; directly determines conduction loss (2.85 W) and thermal rise in primary-side rectification. |
| trr | 35 ns - Reverse recovery time measured at IF=0.5A, IR=1.0A, Irr=0.25A; enables efficient operation up to ~300 kHz without excessive ringing or EMI. |
| IFSM | 125 A - Non-repetitive 8.3 ms half-sine surge rating; withstands inrush currents during cold-start of offline power supplies. |
| RθJA | 32 °C/W - Junction-to-ambient thermal resistance; requires ≥1.5 cm² copper pour for ≤55°C ambient operation at full load. |
| IRM @ 25°C | 5.0 µA - Peak reverse leakage at rated blocking voltage; ensures minimal standby power loss in no-load conditions. |
Pinout & Package
Package: DO-201AD molded plastic case (UL 94V-0), cathode indicated by band, tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to AC input or transformer secondary; must handle full surge current and thermal cycling. |
| Cathode | Forward current exit terminal | Connected to output capacitor or DC bus; polarity marking (band) prevents reverse-bias installation error. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates surface contamination and moisture ingress, ensuring long-term reliability in humid industrial environments. |
| Super-fast switching (35 ns trr) | Reduces switching loss and EMI generation compared to standard rectifiers (e.g., 1N4007: ~2 µs), enabling higher-frequency SMPS designs. |
| 125 A surge rating | Supports repeated cold-start events in universal-input AC/DC adapters without degradation or failure. |
| Low IRM (5.0 µA @ 25°C) | Minimizes standby power consumption in energy-efficient power supplies meeting Level VI or CoC Tier 2 requirements. |
Applications
| AC/DC Adapter Rectification | Switch-Mode Power Supply Output Stage |
|---|---|
Use Scenario: Universal-input (90–264 VAC) 12–24 W wall adapters for consumer electronics. IC Role / Device Role / Timing Role: Primary-side bridge rectifier converting AC line to pulsating DC before bulk capacitor smoothing. Use Value: 0.95 V VF and 35 ns trr reduce conduction and switching losses, improving efficiency from 78% to 82% at full load. |
Use Scenario: Secondary-side freewheeling diode in flyback converters for LED drivers and IoT power modules. IC Role / Device Role / Timing Role: Freewheeling path for transformer leakage inductance energy during MOSFET off-time. Use Value: Low trr minimizes voltage overshoot across primary switch, reducing snubber losses and enabling smaller clamp components. |
| Industrial AC Motor Drive Input Stage | UPS Input Rectifier Module |
Use Scenario: Input rectification in 3-phase rectifier front-ends for variable frequency drives (VFDs) with 200 VDC bus. IC Role / Device Role / Timing Role: Single-phase leg in multi-diode bridge configuration handling continuous 3 A RMS current. Use Value: 125 A IFSM withstands motor startup surges; DO-201AD package allows direct mounting on heatsink via lead-frame thermal path. |
Use Scenario: Line-frequency rectifier in online UPS systems requiring high reliability and surge immunity. IC Role / Device Role / Timing Role: Main AC-to-DC conversion element in dual-conversion topology with battery backup. Use Value: Glass passivation and 150°C Tj rating ensure stable operation during extended brownout conditions with elevated ambient temperature. |
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 | 600 V VRRM, 3.0 A IO, 50 ns trr, TO-220AC package | Higher voltage rating suits 380 VAC industrial systems; larger package requires heatsinking for same current density | Select when >400 V blocking is needed; avoid if space-constrained or cost-sensitive |
| ES3D-E3/54 | 200 V VRRM, 3.0 A IO, 35 ns trr, DO-214AB (SMC) package | Surface-mount footprint enables automated assembly; lower RθJA (25 °C/W) improves thermal performance on PCB | Prefer for new SMT designs; not drop-in compatible due to different package and lead form |
Compared with STTH3L06S and ES3D-E3/54, SF30DG-T offers lowest system cost in through-hole SMPS designs where 200 V rating suffices, balances surge robustness and switching speed in legacy adapter platforms, and provides proven field reliability in high-volume consumer power supplies.
Availability
SF30DG-T is available at Aetrix Electronics and suitable for AC/DC adapters, switch-mode power supplies, industrial motor drive input stages, and UPS rectifier modules requiring stable component supply and long-lifecycle support.
Supply support for SF30DG-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-efficiency power management and signal integrity solutions for industrial, computing, and consumer markets.
SF30DG-T belongs to the SF30xG super-fast rectifier product line, designed specifically for high-frequency, high-reliability AC/DC conversion in cost-sensitive, high-volume power supply applications.
FAQ
What is the maximum operating temperature for SF30DG-T?
SF30DG-T has an operating junction temperature range of −65°C to +150°C. The absolute maximum case temperature is limited by its 32 °C/W thermal resistance and power dissipation; at 3.0 A and 0.95 V VF, junction temperature rises ~91°C above ambient, so ambient must stay below +59°C for safe 150°C Tj operation.
Is SF30DG-T RoHS compliant and lead-free?
Yes, SF30DG-T features a 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.
Can SF30DG-T replace a 1N5408 in a linear power supply?
No - SF30DG-T is a super-fast rectifier optimized for high-frequency switching applications (trr = 35 ns), while 1N5408 is a general-purpose rectifier (trr ≈ 2 µs). In 50/60 Hz linear supplies, SF30DG-T offers no advantage and may exhibit higher leakage at elevated temperatures; its VRRM (200 V) is also lower than 1N5408's 1000 V rating.
What is the recommended PCB pad layout for DO-201AD mounting?
For optimal thermal performance, use ≥1.5 cm² copper pour connected to both anode and cathode pads with ≥0.5 mm thermal reliefs. Maintain ≥2.0 mm clearance from adjacent traces, and follow IPC-7351B DO-201AD footprint (body: 7.2–9.5 mm L × 1.2–1.3 mm W, lead span: 4.8–5.3 mm). Avoid solder mask over thermal pads.
SF30DG-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):
- 200 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 @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SF30DG-T FAQ
1.How can I place an order for SF30DG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SF30DG-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 SF30DG-T reliable?
The price and inventory of SF30DG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF30DG-T is usually 5 days.
3.What payment methods are accepted for SF30DG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF30DG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF30DG-T?
SF30DG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF30DG-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 SF30DG-T?
For technical support, including SF30DG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF30DG-T requirements.
6.How does Aetrix verify that SF30DG-T is sourced from the original manufacturer or authorized distributors?
All SF30DG-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 SF30DG-T meets industry standards.
7.What is the process for return or replacement of SF30DG-T?
All SF30DG-T units undergo pre-shipment inspection (PSI). If there is an issue with SF30DG-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 SF30DG-T part is unused and in its original packaging.
Return procedure for SF30DG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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