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Diodes Incorporated SK35-7
- Part No.:
- SK35-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SK35-7.pdf
- Description:
- DIODE SCHOTTKY 50V 3A SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,578
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Product details
Overview
SK35-7 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-voltage AC-DC power supplies.
For engineers reviewing the SK35-7 datasheet, SK35-7 pinout, SK35-7 application, or SK35-7 equivalent, key selection criteria include VF vs. IR trade-off at 100°C, thermal resistance (RJA = 60°C/W), surge capability (100 A @ 8.3 ms), and SMC package compatibility with high-density PCB layouts.
Technical Context
This Schottky rectifier employs guard ring construction for transient protection and uses low-leakage epitaxial silicon to achieve 0.5 mA reverse current at 25°C and 20 mA at 100°C under full rated blocking voltage. Its 300 pF junction capacitance at 1 MHz and 4 V reverse bias supports switching frequencies up to several hundred kHz in flyback and buck topologies.
The device operates across –65°C to +150°C junction temperature and is mounted on 8.0 mm² copper land pads per JEDEC standards. It is not recommended for new designs; Diodes Incorporated recommends the B3X0 series as a replacement with improved thermal performance and lower VF.
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 - Continuous DC output current capability with derating above 75°C ambient |
| VF @ 3.0 A | 0.50 V - Forward conduction loss determining efficiency in low-voltage secondary-side rectification |
| IR @ 25°C | 0.5 mA - Reverse leakage limiting standby power loss in offline adapters |
| RJA | 60 °C/W - Thermal resistance from junction to ambient on standard 8.0 mm² pad, defining heatsinking requirement |
| CT | 300 pF - Junction capacitance affecting high-frequency switching noise and EMI filter design |
| TJ Range | –65°C to +150°C - Operating range enabling use in automotive under-hood and industrial motor drive environments |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with cathode band polarity marking; dimensions: A = 5.59–6.22 mm, B = 6.60–7.11 mm, C = 2.75–3.18 mm, E = 7.75–8.13 mm; weight ≈ 0.21 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction path | Connected to transformer secondary or switch node; carries full load current during conduction |
| Cathode | Output terminal for forward conduction path | Connected to output capacitor and load; polarity marked by band; defines output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Enhances ruggedness against voltage transients and improves reliability in unregulated input applications |
| Low forward voltage (0.50 V @ 3 A) | Reduces conduction losses in 3.3 V and 5 V output rails, improving system efficiency by ~1.5% vs. Si diodes |
| High surge rating (100 A, 8.3 ms) | Withstands inrush and short-circuit events in power supplies without failure |
| UL 94V-0 flammability rating | Meets safety requirements for enclosed consumer and industrial power enclosures |
| Moisture sensitivity Level 1 | Enables standard SMT reflow without baking, reducing manufacturing overhead |
Applications
| AC-DC Adapter Output Stage | USB-C PD Secondary Rectification |
|---|---|
Use Scenario: 5 V/3 A output stage in compact wall adapters with 60 Hz input and synchronous rectification not implemented. IC Role / Device Role / Timing Role: Uncontrolled Schottky rectifier providing low-loss DC output conversion after transformer secondary. Use Value: 0.50 V VF minimizes heat generation in space-constrained enclosures where thermal margin is <15°C. | Use Scenario: 9 V/2 A output rail in USB-C Power Delivery adapters operating at 100–200 kHz switching frequency. IC Role / Device Role / Timing Role: High-speed freewheeling diode in quasi-resonant flyback topology. Use Value: 300 pF capacitance ensures minimal switching loss increase while maintaining EMI compliance below 30 MHz. |
| Industrial PLC Power Supply | Automotive Infotainment DC/DC Input Protection |
Use Scenario: 24 V auxiliary supply feeding logic circuitry in programmable logic controllers exposed to –40°C to +70°C ambient. IC Role / Device Role / Timing Role: Input-stage rectifier converting 36 VAC transformer output to regulated 24 VDC bus. Use Value: –65°C to +150°C operating range enables reliable operation during cold-start and sustained high-load conditions. | Use Scenario: Reverse-polarity protection and clamping in 12 V DC/DC converters powering head units in vehicles with battery disconnect events. IC Role / Device Role / Timing Role: Low-VF freewheeling path during MOSFET body-diode conduction phase. Use Value: 0.5 mA IR at 25°C prevents excessive quiescent drain in always-on modules meeting ISO 16750-2 sleep current limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| B340A-13-F | 40 V VRRM, 3.0 A I(AV), 0.45 V VF @ 3 A, 500 pF CT | Limited to ≤40 V systems; higher capacitance increases EMI risk above 150 kHz | Preferred where lower VF outweighs reduced voltage margin and higher CT |
| SS35H | 50 V VRRM, 3.0 A I(AV), 0.52 V VF @ 3 A, RJA = 55°C/W | Improved thermal resistance enables 10% higher continuous current at same board area | Recommended when board-level thermal management is constrained and 0.02 V higher VF is acceptable |
Compared with SK35-7, B340A-13-F offers lower forward loss but sacrifices voltage headroom and high-frequency performance, while SS35H provides better thermal handling at a slight VF penalty-both require layout review for thermal pad and EMI filter adjustments.
Availability
SK35-7 is available at Aetrix Electronics and suitable for AC-DC adapters, USB-C power delivery modules, and industrial PLC power supplies requiring stable component supply with legacy design support.
Supply support for SK35-7 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 power management, signal integrity, and protection markets since 1964.
The SKxx series targets cost-sensitive, high-volume power rectification applications where Schottky performance meets basic efficiency and reliability thresholds-designed for mainstream consumer and industrial AC-DC and DC-DC conversion.
FAQ
Is SK35-7 lead-free and RoHS compliant?
Yes, SK35-7 is RoHS compliant and available with matte tin lead-free plating. The part number suffix "-F" (e.g., SK35-7-F) explicitly denotes lead-free termination. Standard SK35-7 also meets J-STD-020A moisture sensitivity Level 1 and UL 94V-0 flammability requirements.
What is the maximum allowable junction temperature during surge events?
The absolute maximum junction temperature is +150°C. During a single 100 A, 8.3 ms half-sine surge, junction temperature rise is calculated using RθJA = 60°C/W and pulse energy; peak TJ remains below 150°C when ambient is ≤75°C and board copper area meets the 8.0 mm² pad specification.
Can SK35-7 replace SK34 in an existing design?
Yes, SK35-7 is a direct upgrade from SK34 (40 V rating) with identical SMC package, pinout, and thermal footprint. The 50 V VRRM provides additional margin against line transients and allows operation in higher-input-voltage derivatives without layout change.
Why is SK35-7 marked "Not Recommended for New Design"?
Diodes Incorporated issued this notice because the B3X0 series offers superior thermal resistance (RJA ≈ 45°C/W), lower VF (0.42 V @ 3 A), and tighter IR distribution. SK35-7 remains fully qualified and supported for legacy production, but new designs should evaluate B340A-13-F or B350A-13-F for improved efficiency and longevity.
SK35-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for SK35-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35-7 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 reliable?
The price and inventory of SK35-7 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 is usually 5 days.
3.What payment methods are accepted for SK35-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35-7?
SK35-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35-7 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?
For technical support, including SK35-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35-7 requirements.
6.How does Aetrix verify that SK35-7 is sourced from the original manufacturer or authorized distributors?
All SK35-7 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 meets industry standards.
7.What is the process for return or replacement of SK35-7?
All SK35-7 units undergo pre-shipment inspection (PSI). If there is an issue with SK35-7, 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 part is unused and in its original packaging.
Return procedure for SK35-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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