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Taiwan Semiconductor Corporation SK54C R7
- Part No.:
- SK54C R7
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SK54C R7.pdf
- Description:
- DIODE SCHOTTKY 40V 5A DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
SK54C R7 from Taiwan Semiconductor is a 5A, 40V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, featuring low forward voltage (0.55 V at 5 A, 25°C), high surge current capability (120 A), and junction temperature rating up to 150°C. It serves as an output rectifier in high-efficiency switching power supplies.
For engineers reviewing the SK54C R7 datasheet, SK54C R7 pinout, SK54C R7 application, or SK54C R7 equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 0.55 V forward drop at rated current, thermal resistance (RθJL = 13°C/W), and moisture sensitivity level 1 compliance for automated assembly.
Technical Context
The SK54C R7 is a single-die, unidirectional Schottky rectifier optimized for high-frequency DC/DC conversion. Its low VF and fast recovery (no stored charge) minimize conduction and switching losses in SMPS topologies operating at 100 kHz–1 MHz.
Designed with a guard ring structure, it provides enhanced overvoltage ruggedness without compromising soft recovery behavior. The device operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling paths |
| IF | 5 A - Continuous forward current rating at TL = 115°C on PCB; sets minimum heatsinking requirement |
| VF | 0.55 V @ 5 A, 25°C - Low conduction loss enables >92% efficiency in 12 V output rails |
| IFSM | 120 A - Peak surge withstand for 8.3 ms half-sine; supports cold-start and transient overload conditions |
| RθJL | 13 °C/W - Junction-to-lead thermal resistance; enables direct thermal coupling to copper pour for passive cooling |
| IR | 0.5 mA @ 40 V, 25°C - Low leakage preserves standby power in energy-efficient adapters |
| dV/dt | 10,000 V/µs - High critical rate of rise tolerance prevents false turn-on in noisy high-dV/dt environments |
Pinout & Package
Package: DO-214AB (SMC) - Surface-mount plastic case with matte tin-plated leads, 0.210 g mass, cathode indicated by band. Compliant with JEDEC DO-214AB, UL 94V-0, and J-STD-020 Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point | Connected to switch node or transformer secondary; must handle full load current and high di/dt |
| Cathode | Output current exit point | Connected to output capacitor and load; polarity marked by molded band; requires low-inductance layout |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Improves avalanche ruggedness and reduces risk of premature breakdown under voltage transients |
| Low VF (0.55 V) | Reduces power dissipation by ~30% vs. comparable 45 V Schottkys, lowering thermal stress on PCB |
| J-STD-020 Level 1 | Enables unlimited floor life and reflow compatibility without dry-pack or baking prior to assembly |
| Halogen-free & RoHS | Meets IPC-1752A material declaration requirements for green electronics manufacturing |
| 150°C TJ max | Supports operation in sealed enclosures or high-ambient industrial environments without derating |
Applications
| Server VRM Output Rectification | Laptop AC Adapter Secondary |
|---|---|
Use Scenario: High-current, high-density 12 V output stage in server voltage regulator modules. IC Role / Device Role / Timing Role: Primary synchronous rectifier replacement; conducts during low-side MOSFET off-time. Use Value: 0.55 V VF reduces conduction loss by 0.3 W vs. 0.65 V alternatives at 5 A, easing thermal design. | Use Scenario: Secondary-side rectification in compact 65 W laptop AC adapters. IC Role / Device Role / Timing Role: Uncontrolled freewheeling diode in flyback topology; handles discontinuous conduction mode peaks. Use Value: 120 A IFSM withstands startup surges without derating; DO-214AB footprint fits tight board space. |
| LED Driver Constant-Current Loop | Industrial DC-DC Converter Input Protection |
Use Scenario: Output rectification in isolated constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: Freewheel path for inductive current in buck-boost LED controller IC feedback loop. Use Value: 40 V VRRM safely blocks reflected voltage spikes from long LED strings; low leakage avoids current drift. | Use Scenario: Reverse-polarity and back-EMF protection at input of 24 V industrial DC-DC converters. IC Role / Device Role / Timing Role: Clamp diode across input terminals; conducts only during fault or inductive kick events. Use Value: 10,000 V/µs dV/dt rating prevents spurious conduction during fast-rising ESD or relay-switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-50WQ04FNTR-M3 | Same 40 V VRRM, 5 A IF, but TO-220AC package; VF = 0.52 V @ 5 A; RθJA = 40°C/W (vs. 53°C/W for SK54C R7) | Requires through-hole mounting and heatsink; unsuitable for SMT-only lines | Select when higher thermal margin is needed and board real estate allows TO-220 footprint |
| ON Semiconductor SB540-E3/54 | 40 V VRRM, 5 A IF, DO-201AD package; VF = 0.54 V @ 5 A; IFSM = 100 A (vs. 120 A) | Larger DO-201AD body increases board area; lower surge rating limits use in high-inrush designs | Select when legacy DO-201AD compatibility is required and surge margin is not critical |
Compared with VS-50WQ04FNTR-M3 and SB540-E3/54, the SK54C R7 offers superior surge robustness (120 A), industry-standard SMC footprint, and Level 1 moisture sensitivity-making it optimal for high-volume, lead-free reflow SMT production of compact power supplies.
Availability
SK54C R7 is available at Aetrix Electronics and suitable for switching mode power supplies, AC adapters, and LED lighting applications requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for SK54C R7 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 power electronics markets since 1979.
The SK52C–SK520C series was developed specifically for high-efficiency, cost-sensitive secondary-side rectification in consumer and industrial SMPS, balancing low VF, rugged surge capability, and SMT manufacturability.
FAQ
What is the maximum junction temperature rating for the SK54C R7?
The SK54C R7 has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet revision S2311. This allows continuous operation in sealed enclosures or high-ambient environments where board-level temperatures reach 100–110°C, provided thermal design maintains junction temperature below 150°C. Derating begins above 115°C lead temperature.
Does the SK54C R7 have a specified reverse recovery time (trr)?
No-Schottky diodes like the SK54C R7 do not exhibit minority-carrier storage, so reverse recovery time is not defined or measured. Instead, the device exhibits ultrafast turn-off governed by junction capacitance and circuit inductance. The SK54C R7's typical CJ is 220 pF at 4 V, enabling clean commutation in 500 kHz–1 MHz SMPS designs without reverse recovery loss or ringing.
Is the SK54C R7 compatible with lead-free reflow soldering profiles?
Yes-the SK54C R7 is qualified for lead-free reflow per J-STD-020 Level 1, with a peak reflow temperature of 260°C. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AB molding compound is rated UL 94V-0. No pre-baking is required due to its Level 1 moisture sensitivity classification.
What is the marking code printed on the SK54C R7 device body?
The SK54C R7 is marked "SK54C" on the device body, per the ordering information and marking diagram in the Taiwan Semiconductor datasheet S2311. The marking appears adjacent to the cathode band and may include additional codes (e.g., date code, factory code) depending on production lot, but the primary identification is "SK54C".
How does the SK54C R7's forward voltage compare to the SK55C R7 at 5 A?
At 5 A and 25°C, the SK54C R7 has a maximum forward voltage (VF) of 0.55 V, while the SK55C R7 (50 V version) is rated at 0.75 V max under identical conditions. This 0.20 V difference reflects the trade-off between reverse voltage rating and forward conduction loss-designers selecting SK54C R7 gain lower power loss where 40 V blocking suffices.
SK54C R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK54C R7 FAQ
1.How can I place an order for SK54C R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SK54C R7 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 SK54C R7 reliable?
The price and inventory of SK54C R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK54C R7 is usually 5 days.
3.What payment methods are accepted for SK54C R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK54C R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK54C R7?
SK54C R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK54C R7 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 SK54C R7?
For technical support, including SK54C R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK54C R7 requirements.
6.How does Aetrix verify that SK54C R7 is sourced from the original manufacturer or authorized distributors?
All SK54C R7 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 SK54C R7 meets industry standards.
7.What is the process for return or replacement of SK54C R7?
All SK54C R7 units undergo pre-shipment inspection (PSI). If there is an issue with SK54C R7, 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 SK54C R7 part is unused and in its original packaging.
Return procedure for SK54C R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SK54C R7 Tags
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