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Taiwan Semiconductor Corporation SF25G-T
- Part No.:
- SF25G-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SF25G-T.pdf
- Description:
- 35NS, 2A, 300V, SUPER FAST RECOV
- Quantity:
- Payment:
- Shipping:
Inventory:2,776
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Product details
Overview
SF25G-T from Taiwan Semiconductor is a 2 A, 300 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 35 ns reverse recovery time, 1.30 V forward voltage at 2 A and 25°C, and 20 pF junction capacitance at 1 MHz/4 V - deployed in DC-DC converter secondary-side rectification.
For engineers reviewing the SF25G-T datasheet, SF25G-T pinout, SF25G-T application, or SF25G-T equivalent, key selection criteria include peak repetitive reverse voltage (300 V), surge current rating (50 A), thermal resistance (65°C/W junction-to-ambient), RoHS/halogen-free compliance, and cathode-band polarity marking for PCB layout verification.
Technical Context
The SF25G-T employs a single-die, glass-passivated PN junction optimized for high-frequency switching applications. Its 35 ns trr and low 20 pF CJ enable efficient operation in 100–500 kHz SMPS topologies where reverse recovery loss must be minimized.
Rated for TJ = –55°C to +150°C and VF = 1.30 V max at IF = 2 A, it delivers stable conduction under transient load conditions while maintaining low power dissipation (VF × IF ≈ 2.6 W typical). The DO-204AC package supports manual and automated assembly with pure tin-plated leads compliant with J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling clamp circuits |
| IF | 2 A continuous - average forward current rating at TA = 75°C; determines heatsink requirements in sustained-load designs |
| IFSM | 50 A (8.3 ms half-sine) - surge capability for startup/inrush events without bond-wire failure |
| trr | 35 ns - reverse recovery time at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; critical for minimizing switching loss in high-frequency converters |
| CJ | 20 pF at 1 MHz, VR = 4 V - low junction capacitance reduces capacitive turn-on loss and EMI generation |
| RθJA | 65°C/W - junction-to-ambient thermal resistance on FR-4 PCB (1 inch² copper pad); used to calculate max ambient temperature for thermal safety |
| VF | 1.30 V max at IF = 2 A, TJ = 25°C - forward voltage drop directly impacts conduction loss and efficiency in 12–48 V output stages |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode indicated by a painted band on the body. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance.
| 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 reference) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor positive; polarity must match PCB silkscreen to prevent catastrophic failure |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr ≤ 35 ns) | Enables operation up to 500 kHz without excessive switching loss or ringing in hard-switched converters |
| Glass passivated junction | Provides robust moisture and contamination resistance for long-term reliability in industrial environments |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for consumer, telecom, and industrial end equipment |
| Low VF (1.30 V max @ 2 A) | Reduces conduction loss by ~15% vs. standard fast rectifiers (e.g., UF4007), improving system efficiency at mid-load |
| Junction temp range (–55°C to +150°C) | Supports deployment in under-hood automotive modules or sealed industrial enclosures without derating below –40°C |
Applications
| DC-DC Converter Secondary Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Used as output rectifier in isolated 24 V → 5 V flyback converter delivering 3 A continuous load. IC Role / Device Role / Timing Role: Unidirectional current valve conducting during transformer reset phase; blocks reverse voltage during primary switch ON time. Use Value: 35 ns trr minimizes reverse recovery charge (Qrr), reducing MOSFET voltage overshoot and snubber losses by >20% vs. standard rectifiers. | Use Scenario: Placed across IGBT collector-emitter in 3-phase motor drive inverter leg to clamp inductive kickback. IC Role / Device Role / Timing Role: Freewheeling path for motor winding current when IGBT turns OFF; must recover before next PWM cycle begins. Use Value: 300 V VRRM and 50 A IFSM withstand 400 V bus transients and 10× rated motor stall currents without avalanche degradation. |
| AC-DC Adapter Output Stage | Industrial Power Supply Hold-up Circuit |
Use Scenario: Final-stage rectifier in 12 V/5 A offline adapter using quasi-resonant controller. IC Role / Device Role / Timing Role: Converts high-frequency transformer output to DC; operates at 65–130 kHz with duty-cycle modulation. Use Value: 20 pF CJ limits displacement current during voltage transitions, lowering EMI filter component count and cost. | Use Scenario: Backup rectifier feeding bulk capacitor in 24 V industrial PLC power supply during AC mains dropout. IC Role / Device Role / Timing Role: Maintains DC bus voltage during 20 ms brownout; conducts only during line sag, not steady-state. Use Value: 150°C TJ max and –55°C TSTG allow uninterrupted operation in unventilated control cabinets across –25°C to +70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R06 | VRRM = 600 V, trr = 35 ns, VF = 1.30 V @ 2 A, DO-15 package | Higher voltage rating suits 400 V bus systems; identical speed and thermal performance | Select when designing for universal input (85–265 VAC) PFC front-end or higher-voltage DC link clamping |
| UF2007 | VRRM = 1000 V, trr = 50 ns, VF = 1.7 V @ 2 A, DO-15 package | Slower recovery and higher VF increase switching loss; better for lower-frequency (<100 kHz) or higher-voltage applications | Choose only if 300 V rating is insufficient and design can tolerate 15% higher conduction loss and reduced efficiency |
Compared with STTH2R06 and UF2007, the SF25G-T offers optimal balance of 300 V blocking, 35 ns speed, and 1.30 V VF for 100–300 kHz industrial DC-DC converters - avoiding over-spec'd voltage margin or unnecessary conduction penalty.
Availability
SF25G-T is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for SF25G-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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.
The SF2xG-T series was developed specifically for high-efficiency, high-reliability switching power supplies - emphasizing fast recovery, low VF, and robust thermal performance in compact DO-15 packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for SF25G-T?
The SF25G-T has a VRRM rating of 300 V, meaning it can reliably block up to 300 V of reverse voltage in repetitive operation without breakdown. This value is confirmed in the Absolute Maximum Ratings table of the official TSC datasheet (Version C2105), and aligns with the "25" in the part number indicating the 300 V grade within the SF21G-T to SF28G-T family.
What is the forward voltage (VF) specification for SF25G-T at rated current?
The SF25G-T exhibits a maximum forward voltage of 1.30 V at IF = 2 A and TJ = 25°C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss boundary used for thermal and efficiency calculations in power supply design.
Does SF25G-T have a defined reverse recovery time (trr), and what is its value?
Yes, the SF25G-T has a specified reverse recovery time of 35 ns, tested under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This parameter is explicitly listed in the Electrical Specifications section and confirms its classification as a super fast rectifier suitable for high-frequency switching applications.
What package type does SF25G-T use, and how is polarity marked?
The SF25G-T uses the DO-204AC (DO-15) axial-leaded package. Polarity is clearly indicated by a cathode band painted on the body - the banded end is the cathode terminal, and the opposite end is the anode. This marking is visible in the Marking Diagram section of the TSC datasheet.
Is SF25G-T compliant with RoHS and halogen-free standards?
Yes, the SF25G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the FEATURES section of the official TSC documentation. The device uses green molding compound and pure tin-plated leads, satisfying environmental requirements for commercial and industrial end equipment.
SF25G-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 300 V
- Capacitance @ Vr, F:
- 20pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF25G-T FAQ
1.How can I place an order for SF25G-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SF25G-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 SF25G-T reliable?
The price and inventory of SF25G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF25G-T is usually 5 days.
3.What payment methods are accepted for SF25G-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF25G-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF25G-T?
SF25G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF25G-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 SF25G-T?
For technical support, including SF25G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF25G-T requirements.
6.How does Aetrix verify that SF25G-T is sourced from the original manufacturer or authorized distributors?
All SF25G-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 SF25G-T meets industry standards.
7.What is the process for return or replacement of SF25G-T?
All SF25G-T units undergo pre-shipment inspection (PSI). If there is an issue with SF25G-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 SF25G-T part is unused and in its original packaging.
Return procedure for SF25G-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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