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Taiwan Semiconductor Corporation SK33B R5G
- Part No.:
- SK33B R5G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK33B R5G.pdf
- Description:
- DIODE SCHOTTKY 30V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,622
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Product details
Overview
SK33B R5G from Taiwan Semiconductor is a 3A, 30V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring low forward voltage (0.75 V max at 3 A, 25°C), high surge current capability (70 A), and junction temperature rating up to +150°C. It serves as a primary output rectifier in compact AC/DC adapters and DC/DC converters where efficiency and thermal robustness are critical.
For engineers reviewing the SK33B R5G datasheet, SK33B R5G pinout, SK33B R5G application, or SK33B R5G equivalent, key selection factors include its 30 V repetitive peak reverse voltage, 100 µA max reverse leakage at 25°C, 23°C/W junction-to-lead thermal resistance, and RoHS/halogen-free compliance for industrial power supply designs.
Technical Context
The SK33B R5G implements a single-die Schottky junction optimized for low conduction loss in medium-voltage switching applications. Its guard ring structure provides overvoltage protection, and matte tin-plated leads ensure reliable solderability per J-STD-002.
Rated for continuous forward current of 3 A at 150°C junction temperature, it supports high-density automated placement with moisture sensitivity level 1 (J-STD-020) and meets UL 94V-0 flammability requirements in its DO-214AA molded plastic case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum non-repetitive reverse blocking voltage; defines safe operating range in 24 V output SMPS designs |
| IF | 3 A - Continuous average forward current at TJ = 150°C; enables compact heatsinking in space-constrained adapters |
| VF (max) | 0.75 V @ 3 A, 25°C - Low conduction loss reduces power dissipation and improves system efficiency |
| IR (max) | 100 µA @ 30 V, 25°C - Minimal leakage preserves standby power budget in energy-sensitive lighting and IoT converters |
| IFSM | 70 A - Peak non-repetitive surge current handling for line-transient immunity in offline power supplies |
| RθJL | 23 °C/W - Low junction-to-lead thermal resistance allows direct PCB copper pour cooling without external heatsink |
| TJ max | +150°C - Extended junction temperature rating supports operation in sealed or high-ambient environments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode indicated by band. Weight ≈ 0.100 g. Molding compound meets UL 94V-0; terminals are matte tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point | Connected to transformer secondary or switch node; must handle full 3 A RMS current and 70 A surge |
| Cathode | Output current exit point | Connected to output filter capacitor and load; polarity marked by visible band on body |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring overvoltage protection | Enhances reliability under transient voltage stress without external snubbers in 24 V adapter outputs |
| Moisture sensitivity level 1 | Eliminates bake requirement before reflow, reducing manufacturing cost and cycle time |
| High surge current capability (70 A) | Withstands repeated 8.3 ms half-sine surges during cold-start or overload conditions |
| Halogen-free construction | Complies with IEC 61249-2-21 for environmentally regulated industrial and consumer end equipment |
Applications
| AC/DC Adapters | LED Lighting Drivers |
|---|---|
Use Scenario: 12–24 V output, 30–60 W wall adapters for consumer electronics and industrial controls. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 0.75 V VF minimizes conduction loss, enabling >88% efficiency at full load without forced air cooling. | Use Scenario: Constant-current LED drivers for commercial downlights and streetlight modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectification element in flyback or buck-boost topologies. Use Value: 100 µA max reverse leakage at 25°C prevents LED dimming drift during standby and improves long-term lumen maintenance. |
| DC/DC Converters | Industrial Power Modules |
Use Scenario: Isolated 5–24 V intermediate bus converters in programmable logic controllers and sensor nodes. IC Role / Device Role / Timing Role: Primary output rectifier in high-frequency (100–500 kHz) flyback or forward converters. Use Value: +150°C TJ max enables operation inside sealed enclosures with ambient temperatures up to +85°C. | Use Scenario: Auxiliary power rails in motor drives, UPS systems, and factory automation I/O modules. IC Role / Device Role / Timing Role: Input-stage rectifier for auxiliary 12/24 V control supply derived from main DC bus. Use Value: 70 A IFSM withstands bus transients during MOSFET short-circuit events, improving system fault tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay SS33HE3/5AT | Same 3 A / 30 V rating; VF = 0.52 V typ (lower), but IR = 200 µA max (higher) | Better efficiency at light load; higher leakage may affect ultra-low-power standby | Prefer when minimizing conduction loss dominates over leakage-critical standby performance |
| ON Semiconductor SB330-T1-GE3 | Identical DO-214AA package; VF = 0.55 V typ, IR = 100 µA max, TJ max = +125°C (lower) | Limited to lower ambient environments; unsuitable for sealed +85°C enclosures | Select only if thermal margin is sufficient and cost is prioritized over extended temperature capability |
Compared with SS33HE3/5AT and SB330-T1-GE3, the SK33B R5G delivers superior thermal endurance (+150°C vs. +125°C) and tighter leakage control (100 µA vs. 200 µA), making it optimal for thermally constrained industrial adapters and lighting drivers requiring long-term reliability.
Availability
SK33B R5G is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting drivers, and industrial DC/DC converters requiring stable component supply, RoHS compliance, and halogen-free materials.
Supply support for SK33B R5G 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 diodes, and MOSFETs for industrial and consumer markets.
The SK3xB series was designed specifically for high-efficiency, surface-mount switching power supplies-emphasizing low VF, robust surge handling, and extended temperature operation in compact SMB packages.
FAQ
What is the maximum junction temperature rating for the SK33B R5G?
The SK33B R5G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet P2212. This allows the SK33B R5G to operate reliably in sealed enclosures or high-ambient environments where thermal management is limited. Derating curves confirm usable current capacity down to zero at +150°C ambient with appropriate PCB copper area.
Does the SK33B R5G meet RoHS and halogen-free requirements?
Yes, the SK33B R5G is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the "Features" section of the Taiwan Semiconductor SK32B–SK320B datasheet (P2212). The molding compound contains no brominated flame retardants, and terminal plating uses lead-free matte tin. These specifications make the SK33B R5G suitable for export to EU, Japan, and other regulated markets.
What is the forward voltage drop of the SK33B R5G at rated current?
The SK33B R5G has a maximum forward voltage (VF) of 0.75 V at 3 A and 25°C junction temperature, per electrical specifications table in the P2212 datasheet. This value is measured under pulse test conditions (PW = 0.3 ms), reflecting typical conduction loss in switching power supplies. At elevated temperatures (e.g., 100°C), VF decreases slightly, further improving efficiency under load.
Is the SK33B R5G suitable for use in high-surge environments like motor drive auxiliary supplies?
Yes, the SK33B R5G supports a peak non-repetitive forward surge current (IFSM) of 70 A for an 8.3 ms half-sine wave, as specified in the absolute maximum ratings table. This makes the SK33B R5G well-suited for auxiliary power rails in motor drives where bus transients occur during fault events. Its guard ring structure also enhances ruggedness against voltage overshoot during commutation.
What package type does the SK33B R5G use, and what are its key mechanical features?
The SK33B R5G uses the DO-214AA (SMB) surface-mount package, with dimensions per JEDEC DO-214 variation AA. Key mechanical features include UL 94V-0 flammability-rated molding compound, matte tin-plated leads compliant with J-STD-002, polarity indicated by cathode band, and moisture sensitivity level 1 (no bake required). The package weighs approximately 0.100 g and supports automated placement.
SK33B R5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SK33B R5G FAQ
1.How can I place an order for SK33B R5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK33B R5G 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 SK33B R5G reliable?
The price and inventory of SK33B R5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK33B R5G is usually 5 days.
3.What payment methods are accepted for SK33B R5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK33B R5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK33B R5G?
SK33B R5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK33B R5G 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 SK33B R5G?
For technical support, including SK33B R5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK33B R5G requirements.
6.How does Aetrix verify that SK33B R5G is sourced from the original manufacturer or authorized distributors?
All SK33B R5G 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 SK33B R5G meets industry standards.
7.What is the process for return or replacement of SK33B R5G?
All SK33B R5G units undergo pre-shipment inspection (PSI). If there is an issue with SK33B R5G, 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 SK33B R5G part is unused and in its original packaging.
Return procedure for SK33B R5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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