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Diodes Incorporated SK35-7-F
- Part No.:
- SK35-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SK35-7-F.pdf
- Description:
- DIODE SCHOTTKY 50V 3A SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,110
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Product details
Overview
SK35-7-F from Diodes Incorporated is a surface-mount Schottky barrier rectifier rated for 50 V maximum recurrent peak reverse voltage, 3.0 A average forward current, and 0.50 V forward voltage at 3.0 A, used in DC/DC converter output stages and low-loss AC-DC front-end rectification.
For engineers reviewing the SK35-7-F datasheet, SK35-7-F pinout, SK35-7-F application, or SK35-7-F equivalent, key selection criteria include VF vs. temperature stability, IFSM surge capability under 8.3 ms half-sine stress, thermal resistance (RθJL = 10 °C/W), and SMC package compatibility with automated PCB assembly.
Technical Context
This Schottky rectifier uses guard ring construction for transient protection and features low forward voltage drop to minimize conduction losses in high-efficiency power supplies. Its 300 pF typical junction capacitance at 1 MHz and 4 V reverse bias supports moderate-frequency switching applications up to ~100 kHz.
The device operates across –65 °C to +150 °C junction temperature and is specified with 8.0 mm² copper land pads for thermal management. It is not recommended for new designs; Diodes Incorporated recommends the B3X0 series as a replacement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum non-repetitive reverse voltage the device blocks without breakdown |
| I(AV) | 3.0 A - Average forward current at 25 °C ambient with 8.0 mm² copper pad cooling |
| VF @ 3.0 A | 0.50 V - Forward voltage drop determining conduction loss in output rectification stage |
| IFSM | 100 A - Peak surge current tolerance for 8.3 ms half-sine waveform, critical for inrush handling |
| RθJL | 10 °C/W - Junction-to-lead thermal resistance with specified 8.0 mm² pad, enabling thermal design |
| CT @ 1 MHz | 300 pF - Junction capacitance affecting high-frequency switching noise and EMI filtering |
| IR @ 25 °C | 0.5 mA - Reverse leakage current at rated VDC, impacting standby power in low-power systems |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin lead-free plating; cathode indicated by band; weight ≈ 0.21 g; moisture sensitivity level 1 per J-STD-020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of AC source or switch node in synchronous rectifier topology |
| Cathode | Forward current exit point | Connected to output rail; polarity marking enables correct orientation during automated placement |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Enhances transient voltage immunity and improves reliability under repetitive line surges |
| Low VF (0.50 V @ 3.0 A) | Reduces power dissipation by ~1.5 W versus higher-VF alternatives at same load current |
| High IFSM (100 A) | Withstands cold-start inrush and short-circuit events without bond-wire fusing |
| UL 94V-0 flammability rating | Meets safety requirements for enclosed industrial and consumer power supply enclosures |
| Lead-free matte tin plating | Complies with RoHS Directive 2011/65/EU and supports Pb-free reflow soldering profiles |
Applications
| AC-DC Adapter Output Rectification | DC-DC Converter Secondary Side |
|---|---|
Use Scenario: 12 V/2.5 A wall adapter converting 100–240 VAC input to regulated DC output. IC Role / Device Role / Timing Role: Schottky rectifier conducting during positive half-cycle of transformer secondary voltage. Use Value: 0.50 V VF minimizes heat generation and enables compact heatsinkless design at full load. | Use Scenario: Isolated 5 V/3 A buck-boost converter in industrial sensor node power rail. IC Role / Device Role / Timing Role: Uncontrolled rectifier in secondary-side synchronous or passive configuration. Use Value: 100 A IFSM withstands repeated startup surges without degradation over 10-year field life. |
| USB-C Power Delivery Front-End | LED Driver Input Stage |
Use Scenario: 20 V/3 A USB PD input stage feeding a buck controller before battery charging circuitry. IC Role / Device Role / Timing Role: Input bridge rectifier replacing four discrete diodes in compact layout. Use Value: SMC package footprint allows dual-device parallel placement for 6 A total capacity within < 12 mm² area. | Use Scenario: Constant-current LED driver for outdoor signage operating from 24 VAC mains-derived supply. IC Role / Device Role / Timing Role: Low-loss rectifier feeding bulk capacitor in offline LED driver front-end. Use Value: 300 pF CT limits high-frequency ringing during zero-crossing, reducing EMI filter component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| B350A-13-F | 50 V VRRM, 3.0 A I(AV), VF = 0.52 V @ 3.0 A, RθJL = 9.5 °C/W, same SMC package | Optimized for higher-temperature operation (TJ max = 175 °C) and tighter VF distribution | Select when extended thermal margin or production yield consistency is required |
| SS35H | 50 V VRRM, 3.0 A I(AV), VF = 0.55 V @ 3.0 A, RθJL = 12 °C/W, SMA package (smaller footprint) | Limited surge rating (IFSM = 75 A), lower thermal mass, unsuitable for high-inrush applications | Select only for space-constrained, low-surge, cost-sensitive consumer designs |
Compared with SK35-7-F, B350A-13-F offers superior thermal robustness and tighter parametric control, while SS35H trades surge capability and thermal performance for board area reduction-making it viable only where those trade-offs are acceptable.
Availability
SK35-7-F is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converter secondary sides, and LED driver input stages requiring stable component supply and RoHS-compliant lead-free assembly.
Supply support for SK35-7-F 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, headquartered in Plano, Texas, serving industrial, computing, communications, and consumer markets.
The SKxx series targets cost-effective, high-reliability power rectification in mainstream AC-DC and DC-DC conversion, emphasizing thermal efficiency and surge resilience in surface-mount form factors.
FAQ
What is the maximum junction temperature for SK35-7-F?
The SK35-7-F has an operating junction temperature range of –65 °C to +150 °C. This rating is validated under conditions with 8.0 mm² copper land pads and assumes no sustained operation above 150 °C, as exceeding this limit risks irreversible degradation of the Schottky junction.
Is SK35-7-F pin-compatible with SK35-7?
Yes - SK35-7-F shares identical SMC package dimensions, terminal layout, and electrical specifications with SK35-7. The "-F" suffix denotes matte tin lead-free plating; both parts use the same die and mechanical form factor, enabling direct substitution in Pb-free reflow processes.
Why is SK35-7-F marked "NOT RECOMMENDED FOR NEW DESIGN"?
Diodes Incorporated issued this notice because the B3X0 series offers improved thermal performance, tighter VF distribution, and extended TJ rating (175 °C). While SK35-7-F remains fully functional and supported, new designs should adopt B350A-13-F or equivalent for long-term supply assurance and enhanced reliability.
Can SK35-7-F be used in parallel for higher current?
Parallel operation is not recommended without external balancing - the SK35-7-F lacks integrated current-sharing features. Variations in VF (±0.05 V typical) cause uneven current distribution; derating by ≥30% per device and adding small series resistors (e.g., 10 mΩ) is required to achieve stable 6 A operation.
SK35-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 750 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 50 V
- Capacitance @ Vr, F:
- 300pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
- Operating Temperature - Junction:
- -65°C ~ 150°C
SK35-7-F FAQ
1.How can I place an order for SK35-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35-7-F 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 SK35-7-F reliable?
The price and inventory of SK35-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35-7-F is usually 5 days.
3.What payment methods are accepted for SK35-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35-7-F?
SK35-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35-7-F 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 SK35-7-F?
For technical support, including SK35-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35-7-F requirements.
6.How does Aetrix verify that SK35-7-F is sourced from the original manufacturer or authorized distributors?
All SK35-7-F 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 SK35-7-F meets industry standards.
7.What is the process for return or replacement of SK35-7-F?
All SK35-7-F units undergo pre-shipment inspection (PSI). If there is an issue with SK35-7-F, 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 SK35-7-F part is unused and in its original packaging.
Return procedure for SK35-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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