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Diodes Incorporated SK33-7-F
- Part No.:
- SK33-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SK33-7-F.pdf
- Description:
- DIODE SCHOTTKY 30V 3A SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,880
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Product details
Overview
SK33-7-F from Diodes Incorporated is a surface-mount Schottky barrier rectifier rated for 30 V maximum recurrent peak reverse voltage, 3.0 A average forward rectified current, and 0.50 V forward voltage at 3.0 A, used in DC/DC converter output stages and low-voltage power supplies where low conduction loss and fast switching are required.
For engineers reviewing the SK33-7-F datasheet, SK33-7-F pinout, SK33-7-F application, or SK33-7-F equivalent, key selection criteria include VF @ 3A, IR @ 25°C and 100°C, thermal resistance (RθJL = 10 °C/W), and SMC package compatibility with high-current PCB layouts.
Technical Context
This Schottky rectifier employs guard ring construction for transient protection and operates across –65 °C to +150 °C junction temperature. Its low 0.50 V forward voltage at 3.0 A reduces conduction losses, while 100 A non-repetitive surge rating supports inrush current handling in power supply inputs.
The device exhibits 300 pF typical junction capacitance at 1 MHz and 4.0 V reverse bias, enabling use in moderate-frequency switching applications up to ~100 kHz. Thermal performance is defined with 8.0 mm² copper land pads per terminal, yielding RθJA = 60 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum reverse blocking capability without breakdown under repetitive conditions |
| I(AV) | 3.0 A - Continuous DC output current capability with 8.0 mm² copper pad cooling |
| VF @ 3.0 A | 0.50 V - Low conduction loss enabling >92% efficiency in 5 V–12 V output rectification |
| IR @ 25°C | 0.5 mA - Leakage current level affecting standby power in always-on circuits |
| RθJL | 10 °C/W - Junction-to-lead thermal resistance defining local heat transfer to PCB copper |
| CT @ 1 MHz | 300 pF - Junction capacitance limiting high-frequency switching speed and EMI generation |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin lead-free plating; polarity indicated by cathode band; approximate weight 0.21 g; moisture sensitivity Level 1 per J-STD-020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point | Connected to unregulated input rail or transformer secondary; must handle full load current and surge |
| Cathode | Output current exit point | Connected to output filter capacitor and load; low VF minimizes voltage drop and heating |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Enhances transient voltage immunity and improves reliability under line surge conditions |
| Low VF (0.50 V @ 3 A) | Reduces power dissipation by ~1.5 W vs. silicon diodes, lowering thermal design burden |
| 100 A IFSM rating | Supports cold-start surges in 12 V automotive and industrial power supplies |
| UL 94V-0 flammability | Meets safety requirements for enclosed power supply enclosures and industrial equipment |
Applications
| AC-DC Adapter Output Stage | USB-C PD Power Path |
|---|---|
Use Scenario: Secondary-side rectification in 5–20 V flyback adapters delivering up to 3 A. IC Role / Device Role / Timing Role: Unidirectional current steering diode converting transformer AC to regulated DC output. Use Value: 0.50 V VF enables <150 mW conduction loss at 3 A, reducing heatsink need and improving no-load efficiency. | Use Scenario: 5 V/3 A or 9 V/2.2 A output rectification in compact USB-C PD adapters. IC Role / Device Role / Timing Role: Output rectifier in quasi-resonant flyback converters operating at 65–130 kHz. Use Value: 300 pF CT and fast recovery minimize switching loss and EMI during high-frequency transitions. |
| Industrial 24 V DC Power Supply | Automotive Accessory Power Module |
Use Scenario: Output rectification in DIN-rail mounted 24 V/3 A switch-mode power supplies. IC Role / Device Role / Timing Role: Main output diode in continuous-conduction-mode (CCM) forward or flyback topologies. Use Value: RθJL = 10 °C/W allows direct mounting on 8 mm² copper pads, eliminating discrete heatsinks in space-constrained enclosures. | Use Scenario: 12 V auxiliary power rectification in vehicle infotainment or ADAS camera modules. IC Role / Device Role / Timing Role: Input-side rectifier handling cold-crank (–40 °C) and load-dump (120 V surge) transients. Use Value: Guard ring construction and 100 A IFSM withstand 12 V system transients without degradation over 15-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| B330A-13-F | Same 30 V VRRM and SMC package; VF = 0.45 V @ 3 A; IR = 0.2 mA @ 25°C | Lower leakage and slightly lower VF improve light-load efficiency in battery-backed systems | Select when minimizing standby current is critical and 0.05 V VF reduction justifies requalification |
| SS33H | 30 V VRRM, SMC package, VF = 0.52 V @ 3 A, IR = 0.5 mA @ 25°C, RθJL = 12 °C/W | Higher thermal resistance requires larger copper area for same power dissipation | Choose if existing layout uses SS3x footprint and minor derating is acceptable |
Compared with SK33-7-F, B330A-13-F offers better light-load efficiency but lacks explicit guard ring documentation; SS33H matches mechanical fit but demands greater PCB copper area to maintain junction temperature limits under full load.
Availability
SK33-7-F is available at Aetrix Electronics and suitable for AC-DC adapters, USB-C PD power modules, and industrial 24 V DC power supplies requiring stable component supply and long-term manufacturability.
Supply support for SK33-7-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, consumer, and communications markets since 1964.
The SKxx series targets cost-sensitive, high-volume power conversion applications where low VF, robust surge capability, and standardized SMC packaging enable rapid integration into board-level power designs.
FAQ
Is SK33-7-F RoHS-compliant and halogen-free?
Yes. SK33-7-F features matte tin lead-free plating and complies with RoHS Directive 2011/65/EU and JEDEC JS709B halogen-free requirements. The molding compound meets UL 94V-0 flammability standard and contains no brominated flame retardants or chlorine-based additives.
What is the maximum allowable PCB trace width for anode and cathode pads?
The datasheet specifies thermal performance based on 8.0 mm² (e.g., 2.8 mm × 2.8 mm) solder land pads per terminal. For 3 A continuous operation, minimum recommended copper area is 8.0 mm² per pad using 2 oz (70 µm) copper; narrower traces increase localized heating and reduce current capacity below 3.0 A.
Can SK33-7-F replace SK32-7-F in an existing design?
Yes, with verification. SK33-7-F has identical SMC package, pinout, and thermal characteristics as SK32-7-F but higher VRRM (30 V vs. 20 V). It is electrically backward-compatible where reverse voltage stress remains ≤30 V; no layout change is needed, but ensure system-level transient margins remain sufficient.
Why is SK33-7-F marked "NOT RECOMMENDED FOR NEW DESIGN"?
Diodes Incorporated recommends the B3X0 series (e.g., B330A-13-F) for new designs due to improved VF consistency, tighter IR distribution, and enhanced surge robustness. SK33-7-F remains fully qualified and supported for legacy production and repair, with no announced discontinuance date.
SK33-7-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):
- 30 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 30 V
- Capacitance @ Vr, F:
- 300pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
- Operating Temperature - Junction:
- -65°C ~ 150°C
SK33-7-F FAQ
1.How can I place an order for SK33-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SK33-7-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 SK33-7-F reliable?
The price and inventory of SK33-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK33-7-F is usually 5 days.
3.What payment methods are accepted for SK33-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK33-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK33-7-F?
SK33-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK33-7-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 SK33-7-F?
For technical support, including SK33-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK33-7-F requirements.
6.How does Aetrix verify that SK33-7-F is sourced from the original manufacturer or authorized distributors?
All SK33-7-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 SK33-7-F meets industry standards.
7.What is the process for return or replacement of SK33-7-F?
All SK33-7-F units undergo pre-shipment inspection (PSI). If there is an issue with SK33-7-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 SK33-7-F part is unused and in its original packaging.
Return procedure for SK33-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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