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Taiwan Semiconductor Corporation SK39B R5G
- Part No.:
- SK39B R5G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK39B R5G.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,256
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Product details
Overview
SK39B R5G from Taiwan Semiconductor is a 3A, 90V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.85V max forward voltage at 3A and 100µA max reverse current at 25°C, designed for high-efficiency DC/DC conversion in compact power supplies.
For engineers reviewing the SK39B R5G datasheet, SK39B R5G pinout, SK39B R5G application, or SK39B R5G equivalent, key selection criteria include its 90V VRRM, 70A IFSM, 23°C/W RθJL, 125–150°C operating junction range, and SMB package compatibility with automated SMT assembly.
Technical Context
The SK39B R5G implements a single-die Schottky junction optimized for low forward voltage drop and fast switching, enabling high-frequency operation without minority-carrier recovery delay. Its guard ring structure provides overvoltage protection, and moisture sensitivity level 1 rating supports standard reflow without dry-pack handling.
Thermally, it delivers 23°C/W junction-to-lead resistance and 63°C/W junction-to-ambient resistance, supporting continuous 3A conduction up to 125°C ambient when properly heatsinked via PCB copper. Reverse leakage remains ≤100 µA at 25°C and ≤2 mA at 125°C under rated 90V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum repetitive reverse blocking voltage; defines safe DC/AC peak voltage limit in rectification circuits |
| IF | 3 A - Continuous average forward current; determines minimum trace width and thermal pad area in PCB layout |
| VF (max) | 0.85 V @ 3A, 25°C - Directly impacts conduction loss (2.55W max at full load) and system efficiency |
| IFSM | 70 A - Non-repetitive surge current capability; enables robustness against inrush and transient overloads |
| RθJL | 23 °C/W - Junction-to-lead thermal resistance; informs heatsinking strategy when lead is soldered to large copper pour |
| TJ range | −55°C to +150°C - Extended junction temperature rating supports operation in sealed or high-ambient industrial enclosures |
| IR (max) | 100 µA @ 25°C, 2 mA @ 125°C - Low leakage preserves standby power budget in energy-sensitive applications |
Pinout & Package
Package: DO-214AA (SMB), surface-mount plastic case with matte tin-plated leads, cathode indicated by band, weight ≈0.100 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of input source (e.g., transformer secondary or switch node) |
| Cathode | Forward current exit / reverse-blocking terminal | Connected to output rail; polarity band must align with PCB silkscreen and schematic symbol |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring overvoltage protection | Enhances ruggedness against voltage transients without external snubbers in SMPS flyback outputs |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow; compatible with standard J-STD-020 Class 1 handling |
| High surge current capability (70A) | Withstands repeated cold-start surges in AC/DC adapters and LED drivers without degradation |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated end equipment |
| Low forward voltage (0.85V max) | Reduces conduction losses by ~15% vs. comparable 100V Schottkys with 0.95V VF, improving thermal margin |
Applications
| SMPS Output Rectification | LED Driver Secondary Side |
|---|---|
Use Scenario: High-frequency flyback or forward converter output stage delivering 12–48V DC to load. IC Role / Device Role / Timing Role: Unidirectional power conversion element conducting during positive half-cycle of transformer secondary voltage. Use Value: 0.85V VF minimizes power loss at 3A output, directly increasing efficiency by ≥0.8% over 0.95V alternatives at full load. | Use Scenario: Constant-current LED string supply with tight thermal constraints in enclosed luminaires. IC Role / Device Role / Timing Role: Freewheeling path for inductive current during PWM off-time; also serves as output rectifier. Use Value: 150°C max junction temperature allows operation in thermally restricted housings where ambient exceeds 85°C. |
| USB-C Power Adapter | Industrial DC/DC Module |
Use Scenario: Compact 65W USB-C PD adapter requiring high power density and low no-load consumption. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement in quasi-resonant topology. Use Value: 100 µA reverse leakage at 25°C reduces standby power, helping meet DOE Level VI and EU CoC Tier 2 requirements. | Use Scenario: Isolated 24V-to-5V/3.3V DC/DC module for PLC I/O modules with wide temperature range. IC Role / Device Role / Timing Role: Input rectifier for unregulated 24V bus feeding buck controller; handles line transients. Use Value: Guard ring structure withstands 1.5× rated VRRM spikes per IEC 61000-4-5, reducing need for TVS clamping. |
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-3EYH09-M3/45 | Same 90V VRRM, 3A IF, but 0.82V typical VF; SMB package, 125°C TJ max | Limited to 125°C junction (vs. SK39B R5G's 150°C); lower leakage (50 µA @ 25°C) | Preferred where ultra-low VF trumps extended temperature range |
| ON Semiconductor SB390-E3/54 | 90V VRRM, 3A IF, 0.85V max VF, but only 125°C TJ max and 200 µA IR @ 25°C | Higher leakage increases standby loss; not rated for 150°C operation | Suitable for cost-sensitive consumer designs with <85°C ambient |
Compared with VS-3EYH09-M3/45 and SB390-E3/54, the SK39B R5G offers superior high-temperature reliability (150°C TJ) and tighter leakage control (100 µA), making it optimal for industrial and enclosed thermal environments where long-term stability is critical.
Availability
SK39B R5G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB-C power adapters requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for SK39B 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, MOSFETs, and TVS diodes, with global distribution and AEC-Q200 qualified product lines.
The SK39B R5G belongs to TSC's SK3xB Schottky rectifier family, engineered for high-efficiency, surface-mount power conversion in space-constrained industrial and consumer power systems.
FAQ
What is the maximum junction temperature rating for the SK39B R5G?
The SK39B R5G has a maximum junction temperature rating of +150°C, verified per its absolute maximum ratings table. This allows reliable operation in thermally demanding applications such as enclosed LED drivers or industrial DC/DC converters where ambient temperatures exceed 85°C. The SK39B R5G maintains specified electrical parameters up to this limit when derated per its forward current derating curve.
Does the SK39B R5G have a guard ring structure, and what benefit does it provide?
Yes, the SK39B R5G incorporates a guard ring for overvoltage protection, as explicitly stated in its features list. This structure enhances edge termination robustness, improving resistance to voltage transients and localized breakdown during surge events. In practice, this allows the SK39B R5G to sustain short-duration overvoltages beyond its 90V VRRM rating without failure-reducing dependency on external clamping components in SMPS output stages.
What is the reverse leakage current specification for the SK39B R5G at elevated temperature?
The SK39B R5G specifies ≤2 mA reverse current at 125°C and rated 90V reverse voltage, per its electrical specifications table. This value is confirmed under pulse test conditions (PW = 30 ms). At 25°C, leakage is ≤100 µA. These figures are critical for estimating standby power loss in always-on applications like USB-C adapters, where the SK39B R5G's low leakage contributes directly to meeting energy efficiency standards.
Is the SK39B R5G compatible with lead-free reflow soldering processes?
Yes, the SK39B R5G is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AA (SMB) package is rated for peak reflow temperatures up to 260°C per J-STD-020. The device carries moisture sensitivity level 1 classification, meaning it can be placed directly into reflow without baking-even after extended storage-ensuring process reliability in high-volume SMT lines.
How does the forward voltage of the SK39B R5G compare to other members of the SK3xB family?
The SK39B R5G shares the same 0.85V maximum forward voltage (at 3A, 25°C) as SK36B and SK39B, while lower-voltage variants (SK32B–SK35B) specify 0.75V max and higher-voltage variants (SK310B–SK320B) specify 0.95V max. This tiered VF reflects the trade-off between reverse voltage capability and conduction loss-making the SK39B R5G an optimal balance for 90V-class applications needing both efficiency and ruggedness.
SK39B 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):
- 90 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 @ 90 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK39B R5G FAQ
1.How can I place an order for SK39B R5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK39B 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 SK39B R5G reliable?
The price and inventory of SK39B R5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK39B R5G is usually 5 days.
3.What payment methods are accepted for SK39B R5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK39B R5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK39B R5G?
SK39B R5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK39B 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 SK39B R5G?
For technical support, including SK39B R5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK39B R5G requirements.
6.How does Aetrix verify that SK39B R5G is sourced from the original manufacturer or authorized distributors?
All SK39B 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 SK39B R5G meets industry standards.
7.What is the process for return or replacement of SK39B R5G?
All SK39B R5G units undergo pre-shipment inspection (PSI). If there is an issue with SK39B 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 SK39B R5G part is unused and in its original packaging.
Return procedure for SK39B R5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SK39B R5G Tags
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