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Taiwan Semiconductor Corporation SK310B
- Part No.:
- SK310B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK310B.pdf
- Description:
- DIODE SCHOTTKY 100V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
SK310B from Taiwan Semiconductor is a 3A, 100V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for high-efficiency switching power supplies with low forward voltage (0.95 V at 3 A, 25°C) and high surge capability (70 A IFSM). It serves as a primary output rectifier in AC/DC adapters and DC/DC converters.
For engineers reviewing the SK310B datasheet, SK310B pinout, SK310B application, or SK310B equivalent, key selection criteria include its 100 V repetitive peak reverse voltage, 0.95 V forward voltage at rated current, 100 µA max reverse leakage at 25°C, 2 mA max at 125°C, and thermal resistance of 23°C/W junction-to-lead - critical for thermal design in compact power stages.
Technical Context
The SK310B employs a single-die Schottky structure with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 100 V VRRM rating targets mid-voltage secondary-side rectification where efficiency and thermal performance outweigh ultra-low VF trade-offs.
With TJ max rated to +150°C and RθJA = 63°C/W, it supports operation in thermally constrained environments when mounted on adequate copper area. The 10,000 V/µs dV/dt rating ensures robustness against fast transient noise in high-frequency SMPS topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100 V - defines maximum allowable reverse blocking voltage in continuous operation |
| IF | 3 A - average forward current rating at case temperature ≤ 75°C, determines steady-state power handling |
| VF @ 3A, 25°C | 0.95 V - directly reduces conduction loss and improves system efficiency vs. higher-VF alternatives |
| IR @ 100V, 25°C | 100 µA - low leakage preserves no-load efficiency and minimizes standby power dissipation |
| IFSM (8.3ms) | 70 A - enables reliable handling of inrush and transient surges without failure |
| RθJL | 23 °C/W - quantifies thermal path efficiency from junction to lead, critical for PCB copper thermal design |
| TJ max | +150 °C - allows extended operation in high-ambient industrial or enclosed adapter environments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode indicated by band. Weight: ~0.100 g. Moisture sensitivity level: J-STD-020 Level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current terminal | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node) |
| Cathode | Output current terminal | Connected to output rail; polarity marked by visible band on molded body |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances ruggedness against voltage transients and edge breakdown in high-dV/dt applications |
| Matte tin-plated leads | Ensures reliable solder wetting and long-term intermetallic stability per J-STD-002 |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally regulated end equipment |
| J-STD-020 Level 1 MSL | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
Applications
| AC/DC Adapters | DC/DC Converters |
|---|---|
Use Scenario: Secondary-side rectification in 12–24 V output wall adapters for consumer electronics. IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diodes to reduce conduction loss and improve light-load efficiency. Use Value: 0.95 V VF at 3 A lowers power loss by ~30% vs. 1.1 V Si diodes, extending battery runtime in portable chargers. | Use Scenario: Output rectification in isolated flyback or forward converters for industrial IoT gateways. IC Role / Device Role / Timing Role: High-reliability unidirectional current path with 70 A surge rating for transient-limited loads. Use Value: 150°C junction rating enables stable operation in sealed enclosures with ambient up to 85°C. |
| LED Drivers | Telecom Power Supplies |
Use Scenario: Constant-current rectification stage in offline LED drivers for commercial lighting. IC Role / Device Role / Timing Role: Low-leakage (100 µA @ 25°C) rectifier minimizing standby current in dimmed or off-state conditions. Use Value: Enables compliance with Energy Star and ERP Tier 2 standby power limits (<0.5 W). | Use Scenario: Primary-side auxiliary supply rectification in telecom brick PSUs requiring high reliability. IC Role / Device Role / Timing Role: Surface-mount Schottky with JESD201 Class 2 whisker resistance for long-life field deployment. Use Value: Matte tin plating and UL 94V-0 molding compound ensure mechanical and flame safety in NEBS-compliant systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay SS310H | Same 100 V VRRM, 3 A IF, but VF = 0.85 V typ at 3 A; SMB package, RoHS/halogen-free | Slightly lower conduction loss; identical mounting and footprint | Preferred where <0.1 V VF reduction justifies sourcing from alternate vendor |
| ON Semiconductor SB3100 | 100 V VRRM, 3 A IF, VF = 0.87 V typ; DO-214AA package; 100 µA IR @ 25°C | Comparable thermal specs (RθJL = 25°C/W); same JEDEC outline | Valid alternative when dual-sourcing or qualifying second-source for BOM resilience |
Compared with SK310B, SS310H offers marginally better conduction efficiency while SB3100 provides equivalent performance with established qualification history - both require no PCB changes and support drop-in replacement in SMB-layout designs.
Availability
SK310B is available at Aetrix Electronics and suitable for AC/DC adapters, DC/DC converters, and LED drivers requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for SK310B 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 management and industrial markets since 1979.
The SK3xB series is part of TSC's high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical secondary-side rectification in compact, high-frequency switching power supplies.
FAQ
What is the maximum junction temperature rating for SK310B?
The SK310B has a maximum junction temperature (TJ max) rating of +150°C, enabling reliable operation in thermally demanding applications such as enclosed power adapters or industrial DC/DC modules where ambient temperatures exceed 85°C. This rating is validated under specified thermal conditions and must be maintained via appropriate PCB copper area and airflow per the datasheet derating curves.
Does SK310B have a RoHS and halogen-free certification?
Yes, SK310B is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability standards, and terminals are matte tin plated to satisfy J-STD-002 solderability requirements. These certifications are documented in Taiwan Semiconductor's official product specification P2212.
What is the forward voltage of SK310B at 3 A and 25°C?
The forward voltage (VF) of SK310B is 0.95 V maximum at 3 A forward current and 25°C junction temperature, measured under pulse test conditions (PW = 0.3 ms). This value reflects worst-case conduction loss for thermal and efficiency calculations in SMPS designs using SK310B.
Is SK310B suitable for use in high-surge applications?
Yes, SK310B supports a non-repetitive peak forward surge current (IFSM) of 70 A for an 8.3 ms half-sine wave, making it suitable for applications subject to inrush currents or transient overloads - such as AC/DC adapters during cold-start or motor drive auxiliary supplies. Derating per Fig.11 is required above 60 Hz.
What package type does SK310B use, and what are its key mechanical features?
SK310B uses the DO-214AA (SMB) surface-mount package with cathode polarity indicated by a band. Key mechanical features include UL 94V-0 flammability-rated molding compound, JESD201 Class 2 whisker-resistant matte tin plating, and J-STD-020 Level 1 moisture sensitivity - eliminating bake requirements before reflow soldering.
SK310B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 100 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 850 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 100 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK310B FAQ
1.How can I place an order for SK310B through Aetrix?
Please submit a Request for Quotation (RFQ) for SK310B 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 SK310B reliable?
The price and inventory of SK310B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK310B is usually 5 days.
3.What payment methods are accepted for SK310B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK310B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK310B?
SK310B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK310B 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 SK310B?
For technical support, including SK310B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK310B requirements.
6.How does Aetrix verify that SK310B is sourced from the original manufacturer or authorized distributors?
All SK310B 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 SK310B meets industry standards.
7.What is the process for return or replacement of SK310B?
All SK310B units undergo pre-shipment inspection (PSI). If there is an issue with SK310B, 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 SK310B part is unused and in its original packaging.
Return procedure for SK310B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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