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Taiwan Semiconductor Corporation SF17G-K
- Part No.:
- SF17G-K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SF17G-K.pdf
- Description:
- 35NS, 1A, 500V, SUPER FAST RECOV
- Quantity:
- Payment:
- Shipping:
Inventory:9,189
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Product details
Overview
SF17G-K from Taiwan Semiconductor is a 1 A, 500 V super fast rectifier diode in DO-204AL (DO-41) package, featuring 1.70 V forward voltage at 1 A and 35 ns reverse recovery time, used for freewheeling and switching-mode power supply output rectification.
For engineers reviewing the SF17G-K datasheet, SF17G-K pinout, SF17G-K application, or SF17G-K equivalent, key selection criteria include peak reverse voltage rating, forward voltage drop under load, thermal resistance, surge current capability, and junction capacitance in high-frequency DC/DC converters.
Technical Context
This discrete silicon rectifier employs a single-die planar construction optimized for fast switching with low stored charge. Its 35 ns trr and 10 pF junction capacitance enable efficient operation in 100 kHz–500 kHz SMPS topologies.
The device operates across –55°C to +150°C junction temperature range, with 20°C/W junction-to-lead thermal resistance supporting 1 A continuous conduction without forced cooling in standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 500 V - supports input/output isolation in 400 V DC bus systems with 20% safety margin |
| IF | 1 A - rated average forward current for continuous conduction mode operation |
| VF @ 1 A, 25°C | 1.70 V - determines conduction loss of 1.7 W per diode at full load |
| trr | 35 ns - enables minimal switching loss and reduced EMI in high-frequency converters |
| RθJL | 20 °C/W - allows direct thermal path to PCB copper for passive heatsinking |
| CJ @ 1 MHz, 4 V | 10 pF - limits capacitive coupling noise in gate-drive or feedback paths |
| IFSM | 30 A - withstands inrush and transient surges without degradation |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, cathode indicated by band. Lead finish: pure tin, J-STD-002 solderable. UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck sync rectifier) |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail; polarity band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr ≤ 35 ns) | Reduces switching losses and improves efficiency in 200–500 kHz DC/DC stages |
| Low VF = 1.70 V @ 1 A | Lowers conduction loss vs. standard rectifiers, easing thermal design at 1 A load |
| Junction capacitance = 10 pF | Minimizes displacement current during voltage transitions, reducing EMI generation |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with environmental regulations for industrial and consumer end equipment |
Applications
| DC/DC Converter Output Rectification | Switching Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at up to 1 A. 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 dead-time losses; 1.70 V VF ensures <1.7 W conduction loss at full load. | Use Scenario: Freewheeling path across inductive loads (e.g., motor windings or relay coils) in half-bridge inverters. IC Role / Device Role / Timing Role: Provides low-impedance return path for inductive current decay when main switches turn off. Use Value: 30 A IFSM handles repetitive inductive kickback; 500 V VRRM covers 400 V bus transients. |
| AC-DC Adapter Secondary Rectifier | Industrial Power Supply Snubber Diode |
Use Scenario: Output rectification in compact 12 V/1 A wall adapters using high-frequency flyback topology. IC Role / Device Role / Timing Role: Converts high-frequency transformer output to regulated DC; operates in discontinuous conduction mode. Use Value: DO-41 package fits tight board space; 10 pF CJ reduces high-frequency ringing on output rail. | Use Scenario: Clamp/snubber diode in RCD networks protecting MOSFETs in offline SMPS. IC Role / Device Role / Timing Role: Conducts transient energy from leakage inductance into snubber capacitor during MOSFET turn-off. Use Value: 35 ns trr ensures rapid turn-on before voltage overshoot peaks; 20°C/W RθJL enables direct PCB copper heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06U | VRRM = 600 V, VF = 1.7 V @ 1 A, trr = 30 ns, same DO-41 package | Slightly faster recovery; higher VRRM margin for 480 V AC-input designs | Preferred where tighter trr tolerance or extended voltage headroom is required |
| ES1D-E3/54 | VRRM = 200 V, VF = 0.95 V @ 1 A, trr = 35 ns, same DO-41 package | Lower voltage rating but significantly lower VF; unsuitable for >200 V reverse stress | Select only for 24–48 V output systems where conduction loss dominates over voltage margin |
Compared with STTH1R06U and ES1D-E3/54, the SF17G-K offers optimal balance of 500 V rating, 1.70 V VF, and 35 ns trr in cost-sensitive 1 A industrial power supplies-neither over-specified nor under-rated for typical 400 V DC bus applications.
Availability
SF17G-K is available at Aetrix Electronics and suitable for DC/DC converters, switching inverters, and freewheeling applications requiring stable component supply and RoHS-compliant discrete rectifiers.
Supply support for SF17G-K 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 global industrial and consumer markets since 1979.
The SF11G-K to SF18G-K series was developed specifically for high-efficiency, high-reliability secondary-side rectification and freewheeling in compact, thermally constrained AC/DC and DC/DC power supplies.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for SF17G-K?
The SF17G-K has a VRRM rating of 500 V, verified per Taiwan Semiconductor's B2104 datasheet. This value defines the highest instantaneous reverse voltage the diode can block repeatedly without breakdown. It is critical for ensuring safe operation in 400 V DC bus systems with transient margin. The SF17G-K must not be substituted with lower-VRRM variants like SF14G-K (200 V) or SF15G-K (300 V) in such applications.
What is the forward voltage drop (VF) of SF17G-K at 1 A and 25°C?
The SF17G-K exhibits a typical forward voltage of 1.70 V at 1 A and 25°C junction temperature, as specified in the Electrical Specifications table. This VF directly determines conduction loss (Pcond = IF × VF) and impacts thermal design. At elevated temperatures, VF decreases slightly, but derating curves in the datasheet confirm sustained 1 A capability up to 150°C TJ.
Does SF17G-K have a defined reverse recovery time (trr), and what is its value?
Yes, the SF17G-K has a maximum reverse recovery time of 35 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This trr value is confirmed in the Electrical Specifications section and is essential for minimizing switching losses and EMI in high-frequency power converters. Devices with longer trr (e.g., standard rectifiers > 200 ns) would increase losses and require additional snubbing when replacing SF17G-K.
What package type does SF17G-K use, and are the leads lead-free?
SF17G-K uses the DO-204AL (DO-41) axial package with pure tin-plated leads compliant with J-STD-002 solderability requirements. The leads are lead-free and RoHS-compliant, and the molding compound meets UL 94V-0 flammability rating. Polarity is marked by a cathode band, and the device weighs approximately 0.330 g.
Is SF17G-K suitable for freewheeling applications in motor drive circuits?
Yes, SF17G-K is explicitly listed for freewheeling applications in its official documentation. With 500 V VRRM, 30 A IFSM, and 35 ns trr, it safely clamps inductive kickback from 24–48 V motor windings or solenoids in half-bridge or H-bridge drivers. Its 20°C/W RθJL allows effective heat transfer to PCB copper, making SF17G-K well-suited for thermally constrained motor control PCBs.
SF17G-K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 500 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 500 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF17G-K FAQ
1.How can I place an order for SF17G-K through Aetrix?
Please submit a Request for Quotation (RFQ) for SF17G-K 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 SF17G-K reliable?
The price and inventory of SF17G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF17G-K is usually 5 days.
3.What payment methods are accepted for SF17G-K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF17G-K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF17G-K?
SF17G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF17G-K 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 SF17G-K?
For technical support, including SF17G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF17G-K requirements.
6.How does Aetrix verify that SF17G-K is sourced from the original manufacturer or authorized distributors?
All SF17G-K 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 SF17G-K meets industry standards.
7.What is the process for return or replacement of SF17G-K?
All SF17G-K units undergo pre-shipment inspection (PSI). If there is an issue with SF17G-K, 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 SF17G-K part is unused and in its original packaging.
Return procedure for SF17G-K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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