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Taiwan Semiconductor Corporation SK320B
- Part No.:
- SK320B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK320B.pdf
- Description:
- DIODE SCHOTTKY 200V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,765
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Product details
Overview
SK320B from Taiwan Semiconductor is a 3A, 200V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for high-efficiency switching power supplies with low forward voltage (0.95 V max at 3 A, 25°C) and high surge capability (70 A IFSM). It operates up to 150°C junction temperature and features guard ring overvoltage protection.
For engineers reviewing the SK320B datasheet, SK320B pinout, SK320B application, or SK320B equivalent, this device is selected for high-frequency SMPS, AC/DC adapters, and DC/DC converters where low conduction loss, fast recovery, and thermal robustness are critical design requirements.
Technical Context
The SK320B implements a single-die Schottky barrier structure with metal–semiconductor junction enabling near-zero reverse recovery time and minimal switching losses. Its 200 V VRRM rating supports universal input AC/DC front-end designs while maintaining low VF across operating temperature range.
Thermal performance is defined by RθJL = 23°C/W and RθJA = 63°C/W, enabling reliable 3 A continuous operation in SMB footprint without forced airflow. The cathode-band polarity marking and matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Supports universal AC input (85–265 VAC) rectification with safety margin |
| IF | 3 A continuous - Sustains full-rated output current in compact SMB package |
| VF (max) | 0.95 V at 3 A, 25°C - Reduces conduction loss vs. standard PN diodes (~0.4–0.5 V lower) |
| IR (max) | 100 µA at 200 V, 25°C - Ensures low standby leakage in high-impedance bias networks |
| IFSM | 70 A (8.3 ms half-sine) - Withstands inrush surges during cold-start of power supplies |
| TJ max | 150°C - Enables operation in thermally constrained enclosures without derating at 125°C ambient |
| RθJL | 23°C/W - Allows direct PCB copper pour heat sinking for stable thermal management |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band on body. Matte tin-plated leads, J-STD-002 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction path | Connected to transformer secondary or switch node; carries full load current |
| Cathode | Output terminal for forward conduction path | Connected to output capacitor or filter inductor; defines output polarity |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Prevents edge breakdown under transient overvoltage, improving reliability in unregulated line conditions |
| Low VF at high TJ | 0.95 V max at 25°C and maintained <1.1 V up to 150°C - minimizes thermal runaway risk |
| Moisture sensitivity level 1 | No bake requirement before reflow - compatible with standard SMT assembly lines |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS - meets environmental compliance for global OEMs |
| UL 94V-0 molding compound | Self-extinguishing encapsulation - satisfies safety standards for enclosed power supplies |
Applications
| AC/DC Adapters | Server PSU Secondary Rectification |
|---|---|
Use Scenario: 12 V/3 A output stage in wall-plug adapter for consumer electronics. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 0.95 V VF reduces conduction loss by ~1.2 W vs. PN diode, improving efficiency from 84% to 87% at full load. | Use Scenario: +12 V rail rectification in redundant 80 PLUS Titanium server power supply. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in LLC resonant converter secondary side. Use Value: 70 A IFSM withstands multi-phase current summation surges; 150°C TJ rating supports high-density layout with limited airflow. |
| LED Driver Power Stage | Industrial DC/DC Converter |
Use Scenario: Constant-current LED driver for outdoor signage with wide ambient temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Freewheeling diode in buck regulator controlling 350 mA LED string. Use Value: Low IR (<100 µA at 25°C) prevents LED dimming drift in high-impedance feedback paths; −55°C to +150°C rating ensures startup at extreme cold. | Use Scenario: 24 V input to 5 V isolated DC/DC module for PLC I/O modules. IC Role / Device Role / Timing Role: Input bridge rectifier feeding active clamp forward converter. Use Value: 200 V VRRM provides 2× safety margin over 24 V nominal with 100 V transients; DO-214AA footprint enables automated placement in space-constrained industrial PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay SS3H20 | Same 3 A / 200 V rating; VF = 0.82 V (typ) at 3 A; RθJA = 50°C/W | Slightly lower VF improves light-load efficiency; tighter thermal resistance allows higher ambient operation | Preferred when board-level thermal management is limited and peak efficiency >88% is required |
| ON Semiconductor SB320 | 3 A / 200 V; VF = 0.92 V (max); IFSM = 60 A; TJ max = 125°C | Lower surge rating and junction temperature limit reduce margin in high-inrush or high-ambient environments | Acceptable for cost-sensitive consumer adapters where 125°C TJ and 60 A surge suffice |
Compared with SS3H20 and SB320, the SK320B delivers balanced trade-offs: higher surge tolerance than SB320 and superior overvoltage robustness via guard ring, while offering broader temperature capability (150°C vs. SS3H20's 125°C) for industrial deployment.
Availability
SK320B is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, LED drivers, and industrial DC/DC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for SK320B 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, specializing in power rectifiers, TVS devices, and MOSFETs for industrial and computing markets.
The SK32B–SK320B series was designed specifically for high-efficiency, surface-mount AC/DC and DC/DC power conversion, emphasizing low VF, high surge resilience, and extended temperature operation in compact SMB packages.
FAQ
What is the maximum junction temperature rating for SK320B?
The SK320B has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official TSC datasheet P2212. This allows uninterrupted 3 A operation at ambient temperatures up to +85°C with standard PCB copper heatsinking. The SK320B must not exceed 150°C junction temperature during any operational condition, including transient surges.
Does SK320B have a guard ring structure, and what is its function?
Yes, the SK320B incorporates a guard ring structure explicitly stated in its features list. This design mitigates edge breakdown under high dv/dt or transient overvoltage conditions, enhancing reliability in unregulated or noisy line environments. The guard ring is integral to the die layout and contributes directly to the device's 10,000 V/μs critical rate of rise of off-state voltage rating.
What is the forward voltage specification for SK320B at 3 A and 100°C junction temperature?
The SK320B datasheet does not specify VF at 100°C and 3 A; only the 25°C value (0.95 V max) is guaranteed. However, typical VF curves (Fig.10) show SK315B–SK320B family VF remains below 1.05 V at 3 A and 100°C. For design margin, use 1.1 V at 100°C unless thermal simulation confirms lower actual junction temperature.
Is SK320B suitable for synchronous rectification circuits?
No, the SK320B is a passive Schottky rectifier and not designed for synchronous rectification. It lacks gate control, body diode timing specifications, or MOSFET-compatible drive requirements. Synchronous rectification requires actively controlled MOSFETs (e.g., N-channel power FETs with dedicated drivers). The SK320B serves only as a freewheeling or output rectifier in non-synchronous topologies like flyback or forward converters.
What packaging and reel quantity is offered for SK320B?
The SK320B is supplied in DO-214AA (SMB) package on 3,000-piece tape-and-reel format, per TSC ordering information section (Version P2212). Reel diameter, orientation, and leader/trailer lengths conform to EIA-481-D standards. No bulk or ammo-pack options are specified for SK320B in official documentation.
SK320B 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):
- 200 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK320B FAQ
1.How can I place an order for SK320B through Aetrix?
Please submit a Request for Quotation (RFQ) for SK320B 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 SK320B reliable?
The price and inventory of SK320B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK320B is usually 5 days.
3.What payment methods are accepted for SK320B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK320B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK320B?
SK320B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK320B 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 SK320B?
For technical support, including SK320B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK320B requirements.
6.How does Aetrix verify that SK320B is sourced from the original manufacturer or authorized distributors?
All SK320B 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 SK320B meets industry standards.
7.What is the process for return or replacement of SK320B?
All SK320B units undergo pre-shipment inspection (PSI). If there is an issue with SK320B, 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 SK320B part is unused and in its original packaging.
Return procedure for SK320B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SK320B Tags
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