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Taiwan Semiconductor Corporation SK35B R5G
- Part No.:
- SK35B R5G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK35B R5G.pdf
- Description:
- DIODE SCHOTTKY 50V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,177
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Product details
Overview
SK35B R5G from Taiwan Semiconductor is a 3A, 50V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for high-efficiency switching power supplies with low forward voltage (0.75 V max at 3 A, 25°C), high surge capability (70 A IFSM), and junction temperature up to +150°C. It serves as primary output rectification in AC/DC adapters and DC/DC converters.
For engineers reviewing the SK35B R5G datasheet, SK35B R5G pinout, SK35B R5G application, or SK35B R5G equivalent, key selection criteria include its 50 V VRRM rating, 0.75 V forward voltage ceiling, 100 µA reverse leakage at 25°C, thermal resistance (RθJA = 63°C/W), and SMB package compatibility with automated SMT assembly.
Technical Context
The SK35B R5G implements a single-die Schottky junction structure with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 50 V repetitive peak reverse voltage and 35 V RMS reverse voltage define its use in mid-voltage secondary-side rectification.
Thermal performance is characterized by 23°C/W junction-to-lead (RθJL) and 63°C/W junction-to-ambient (RθJA) resistance, enabling reliable operation up to 150°C junction temperature under sustained 3 A DC load with appropriate PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum non-repetitive reverse voltage the device blocks without breakdown; sets upper limit for output rectification in 36–48 V nominal systems. |
| IF | 3 A - Continuous forward current rating at TA = 25°C; defines steady-state power delivery capacity in SMPS secondary windings. |
| VF (max) | 0.75 V @ 3 A, 25°C - Low conduction loss improves efficiency and reduces heat generation in compact adapter designs. |
| IR (max) | 100 µA @ 50 V, 25°C - Low leakage preserves no-load efficiency and minimizes standby power in energy-sensitive applications. |
| IFSM | 70 A - Peak non-repetitive surge current handling; withstands inrush and transient overloads during startup or fault conditions. |
| TJ max | +150°C - Extended junction temperature rating supports operation in thermally constrained enclosures without derating at lower ambient. |
| RθJA | 63°C/W - Thermal resistance from junction to ambient; requires ≥1 cm² of 1-oz copper pad for full 3 A rating in still air. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount plastic case with cathode band polarity indicator, moisture sensitivity level 1 (per J-STD-020), UL 94V-0 molding compound, and 0.100 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to transformer secondary or switch node; must be routed with low-inductance trace for high-frequency switching stability. |
| Cathode | Forward current exit / reverse voltage reference | Marked by band; ties to output capacitor positive rail; determines output polarity and ground reference in isolated topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances ruggedness against transient overvoltage events without requiring external snubbers in 50 V-class SMPS designs. |
| Low VF (0.75 V max) | Reduces conduction loss by ~30% vs. comparable 50 V silicon diodes, directly improving adapter efficiency above 85% at full load. |
| High IFSM (70 A) | Supports robust startup behavior in flyback and forward converters without fuse coordination or current limiting redesign. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant industrial and consumer end products. |
| J-STD-020 Level 1 | Enables unlimited floor life and reflow compatibility without dry-pack or baking-critical for high-volume SMT production lines. |
Applications
| AC/DC Adapters | LED Drivers |
|---|---|
Use Scenario: 12–24 V output, 30–60 W wall-mounted power adapters for consumer electronics. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 0.75 V VF minimizes heat rise in sealed enclosures; SMB footprint enables compact PCB layout with minimal thermal relief area. | Use Scenario: Constant-current LED drivers for commercial downlights and street lighting modules. IC Role / Device Role / Timing Role: Secondary-side freewheeling and rectification in buck-derived or flyback-based LED current regulation circuits. Use Value: 150°C TJ rating ensures reliability under high-ambient thermal stress near LED arrays; low IR prevents output drift at elevated temperatures. |
| Industrial DC/DC Converters | USB PD Power Delivery Modules |
Use Scenario: 5–24 V isolated DC/DC modules for PLC I/O and sensor interface power rails. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in cost-optimized non-synchronous flyback topologies. Use Value: 70 A IFSM handles repeated short-circuit transients common in industrial field wiring faults without degradation. | Use Scenario: 20 V output stage in 60 W USB PD 3.0 compliant chargers with dual-port negotiation. IC Role / Device Role / Timing Role: Secondary-side rectifier delivering regulated 20 V to USB-C port controller and load switch. Use Value: 50 V VRRM provides 2× margin over 20 V output, ensuring safe operation during dynamic load steps and cable drop compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS35H (ON Semiconductor) | Same 3 A / 50 V rating, but VF = 0.72 V typ (vs. 0.75 V max for SK35B R5G); RθJA = 60°C/W. | Slightly lower conduction loss; identical SMB package and pinout. | Preferred where marginal efficiency gain justifies sourcing from alternate vendor; validated in same adapter BOMs. |
| SB350 (Vishay) | 3 A / 50 V, VF = 0.72 V typ, IR = 100 µA max at 25°C, but TJ max = +125°C (vs. +150°C for SK35B R5G). | Limited high-temp operation; requires earlier thermal derating above 85°C ambient. | Select when cost is prioritized and ambient temperature remains below 70°C; verify thermal margin in enclosed designs. |
Compared with SS35H and SB350, the SK35B R5G offers superior high-temperature endurance (+150°C TJ) and tighter process control on IR at 100°C (5 mA max), making it preferred for thermally aggressive industrial and outdoor-rated power supplies where long-term reliability outweighs minor VF differences.
Availability
SK35B R5G is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and industrial DC/DC converters requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.
Supply support for SK35B 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 devices, and MOSFETs since 1979.
The SK32B–SK320B family was designed specifically for high-volume, cost-sensitive switching power supply applications demanding robust surge immunity, low VF, and JEDEC-standard SMB packaging for global SMT manufacturing.
FAQ
What is the maximum junction temperature rating for SK35B R5G?
The SK35B R5G has a maximum junction temperature (TJ max) of +150°C, verified per TSC's P2212 datasheet revision. This allows uninterrupted 3 A DC operation at higher ambient temperatures than standard 125°C-rated Schottky diodes. The SK35B R5G maintains specified electrical parameters-including VF and IR-up to this limit when thermal design meets RθJA = 63°C/W requirements.
Does SK35B R5G have a halogen-free construction?
Yes, the SK35B R5G uses halogen-free molding compound compliant with IEC 61249-2-21, as confirmed in the "Features" section of the official Taiwan Semiconductor datasheet (P2212). This makes the SK35B R5G suitable for environmentally regulated markets including EU RoHS and China RoHS, without compromising mechanical robustness or flammability rating (UL 94V-0).
What is the forward voltage specification for SK35B R5G at rated current?
The SK35B R5G has a maximum forward voltage (VF) of 0.75 V at IF = 3 A and TJ = 25°C, per the "ELECTRICAL SPECIFICATIONS" table in the P2212 datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the worst-case conduction loss used for thermal and efficiency calculations in SMPS designs using the SK35B R5G.
Is SK35B R5G compatible with lead-free reflow soldering processes?
Yes, the SK35B R5G features matte tin-plated leads qualified per J-STD-002 for solderability and is rated at moisture sensitivity level 1 (J-STD-020), meaning it can be subjected to standard lead-free reflow profiles (peak 260°C) without baking or dry-pack requirements. This simplifies manufacturing integration for the SK35B R5G in high-yield SMT lines.
What package type does SK35B R5G use, and what are its key mechanical attributes?
The SK35B R5G uses the DO-214AA (SMB) surface-mount package, with dimensions 4.60 × 2.60 × 2.00 mm (L × W × H), cathode band polarity marking, and 0.100 g typical weight. Its UL 94V-0 flammability rating, JESD201 Class 2 whisker resistance, and JEDEC-compliant outline ensure mechanical reliability and regulatory compliance in the SK35B R5G's target applications.
SK35B 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):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 750 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK35B R5G FAQ
1.How can I place an order for SK35B R5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35B 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 SK35B R5G reliable?
The price and inventory of SK35B R5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35B R5G is usually 5 days.
3.What payment methods are accepted for SK35B R5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35B R5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35B R5G?
SK35B R5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35B 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 SK35B R5G?
For technical support, including SK35B R5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35B R5G requirements.
6.How does Aetrix verify that SK35B R5G is sourced from the original manufacturer or authorized distributors?
All SK35B 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 SK35B R5G meets industry standards.
7.What is the process for return or replacement of SK35B R5G?
All SK35B R5G units undergo pre-shipment inspection (PSI). If there is an issue with SK35B 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 SK35B R5G part is unused and in its original packaging.
Return procedure for SK35B R5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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