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Taiwan Semiconductor Corporation SK55C
- Part No.:
- SK55C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SK55C.pdf
- Description:
- DIODE SCHOTTKY 50V 5A DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,249
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Product details
Overview
SK55C from Taiwan Semiconductor is a 5A, 50V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, optimized for high-efficiency switching power supplies with low forward voltage (0.75 V at 5 A, 25°C) and high surge capability (120 A IFSM). It serves as the primary output rectifier in AC/DC adapters and DC/DC converters.
For engineers reviewing the SK55C datasheet, SK55C pinout, SK55C application, or SK55C equivalent, key selection criteria include its 50 V repetitive peak reverse voltage, 0.75 V forward drop at rated current, 10 mA reverse leakage at 100°C, 13°C/W junction-to-lead thermal resistance, and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
The SK55C employs a single-die Schottky structure with guard ring overvoltage protection, enabling stable operation under transient voltage stress in high-frequency SMPS topologies. Its 10,000 V/µs critical dV/dt rating supports reliable commutation in fast-switching flyback and forward converters.
Thermally, it delivers 5 A continuous forward current with junction temperature maintained ≤150°C using standard PCB copper pads (16 mm × 16 mm), leveraging a 13°C/W RθJL to minimize thermal bottleneck at the lead interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 48 V-output SMPS secondary-side rectification |
| IF | 5 A - Continuous average forward current; supports ≥60 W output at typical adapter efficiency levels |
| VF | 0.75 V @ 5 A, 25°C - Low conduction loss directly reduces heat generation and improves system efficiency |
| IR | 0.5 mA @ 50 V, 25°C; 10 mA @ 50 V, 100°C - Low leakage preserves regulation margin across industrial temperature range |
| IFSM | 120 A @ 8.3 ms half-sine - Withstands inrush and fault currents without degradation in converter startup or short-circuit events |
| RθJL | 13 °C/W - Enables direct thermal coupling to PCB copper, simplifying heatsinking for compact adapter designs |
Pinout & Package
Package: DO-214AB (SMC) - Surface-mount plastic case with matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated molding compound, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current terminal | Connected to transformer secondary or switch node; accepts full forward surge current path |
| Cathode | Output current terminal | Connected to output capacitor and load; polarity marked by visible band on body |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances ruggedness against voltage transients and edge breakdown in high-dV/dt environments |
| Low VF Schottky junction | Reduces conduction loss by ~30% vs. comparable 50 V silicon rectifiers, lowering thermal load |
| 120 A IFSM rating | Supports robust operation during cold-start and output short-circuit conditions without bond-wire failure |
| DO-214AB (SMC) package | Enables high-current density mounting with standardized 3,000-unit tape-and-reel packaging for pick-and-place automation |
Applications
| AC/DC Adapters | LED Drivers |
|---|---|
Use Scenario: 12–24 V, 30–60 W wall-mounted power adapters for consumer electronics. IC Role / Device Role / Timing Role: Output rectifier in high-frequency flyback converter secondary stage. Use Value: 0.75 V forward drop minimizes power loss at 5 A load, maintaining >88% efficiency while meeting CoC Tier 2 requirements. |
Use Scenario: Constant-current LED drivers for commercial downlights and street lighting modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectification element in isolated buck-boost topology. Use Value: Low leakage (<0.5 mA at 25°C) prevents output voltage drift during dimming cycles and standby modes. |
| Industrial SMPS | USB PD Power Delivery |
Use Scenario: 48 V input, 12 V/5 A regulated output for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Main output rectifier in forward converter with active clamp reset. Use Value: 13°C/W RθJL allows direct PCB copper thermal path, eliminating need for external heatsink in sealed enclosures. |
Use Scenario: 20 V/5 A output stage in USB PD 3.0 compliant chargers supporting 100 W delivery. IC Role / Device Role / Timing Role: Secondary-side rectifier in high-frequency active-clamp forward or LLC resonant converter. Use Value: 10,000 V/µs dV/dt rating ensures immunity to ringing-induced false turn-on during fast gate transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS55HE3/5BT (Vishay) | Same 50 V VRRM, 5 A IF, but VF = 0.72 V @ 5 A; slightly lower RθJA (45°C/W vs. 53°C/W) | Identical DO-214AB footprint; optimized for higher ambient temp operation due to tighter IR spec (0.3 mA @ 25°C) | Preferred where <0.5 mA room-temp leakage is mandatory; same layout, no requalification needed |
| MBR550 (ON Semiconductor) | 50 V VRRM, 5 A IF, VF = 0.78 V @ 5 A; IFSM = 100 A (lower surge margin) | DO-214AB compatible; lacks guard ring, limiting dV/dt capability (5,000 V/µs) | Cost-sensitive designs with benign line transients; verify surge margin in high-inrush applications |
Compared with SS55HE3/5BT and MBR550, the SK55C offers superior transient ruggedness via its guard ring and balanced trade-off between forward drop (0.75 V), leakage (0.5 mA), and surge rating (120 A), making it optimal for industrial-grade adapters requiring long-term reliability under variable line conditions.
Availability
SK55C is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and industrial SMPS requiring stable component supply, RoHS-compliant manufacturing, and halogen-free materials.
Supply support for SK55C 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with ISO 9001 and IATF 16949 certified facilities.
The SK55C belongs to TSC's SK5xC Schottky rectifier family, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally constrained switching power supplies.
FAQ
What is the maximum junction temperature rating for the SK55C?
The SK55C has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings table. This allows sustained 5 A operation in ambient temperatures up to +85°C when mounted on a 16 mm × 16 mm PCB copper pad, leveraging its 13°C/W RθJL. Exceeding this limit risks parametric shift and accelerated degradation of the Schottky junction in the SK55C.
Does the SK55C have a guard ring structure, and what benefit does it provide?
Yes, the SK55C incorporates a guard ring for overvoltage protection, explicitly stated in its features list. This structure suppresses edge breakdown under high dV/dt stress, enabling reliable operation at 10,000 V/µs - critical for noise-immune performance in fast-switching SMPS where the SK55C is used as the output rectifier.
What is the reverse leakage current of the SK55C at elevated temperature?
The SK55C exhibits 10 mA reverse leakage current (IR) at 50 V and 100°C, per electrical specifications table. This value is confirmed for SK55C/SK56C group under TJ = 100°C test condition. At 125°C, leakage is not specified in the datasheet, so design margins must assume worst-case extrapolation beyond 100°C for the SK55C.
Is the SK55C compatible with lead-free reflow soldering processes?
Yes, the SK55C uses matte tin-plated leads compliant with J-STD-002 for solderability and meets JESD 201 Class 2 whisker resistance requirements. Its moisture sensitivity level is rated Level 1 (per J-STD-020), meaning it can be subjected to standard lead-free reflow profiles without baking - a verified characteristic of the SK55C package construction.
What is the marking code and polarity identification method for the SK55C?
The SK55C is marked "SK55C" on the device body, with cathode polarity indicated by a distinct band near one end of the DO-214AB (SMC) package. This band aligns with the cathode terminal, which must connect toward the positive output rail - consistent with all SK5xC series parts and clearly shown in the marking diagram on page 6 of the SK55C datasheet.
SK55C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 750 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK55C FAQ
1.How can I place an order for SK55C through Aetrix?
Please submit a Request for Quotation (RFQ) for SK55C 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 SK55C reliable?
The price and inventory of SK55C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK55C is usually 5 days.
3.What payment methods are accepted for SK55C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK55C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK55C?
SK55C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK55C 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 SK55C?
For technical support, including SK55C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK55C requirements.
6.How does Aetrix verify that SK55C is sourced from the original manufacturer or authorized distributors?
All SK55C 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 SK55C meets industry standards.
7.What is the process for return or replacement of SK55C?
All SK55C units undergo pre-shipment inspection (PSI). If there is an issue with SK55C, 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 SK55C part is unused and in its original packaging.
Return procedure for SK55C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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