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Taiwan Semiconductor Corporation SK35BH
- Part No.:
- SK35BH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK35BH.pdf
- Description:
- DIODE SCHOTTKY 50V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
SK35BH from Taiwan Semiconductor is a 3A, 50V Schottky barrier rectifier in DO-214AA (SMB) package, qualified to AEC-Q101, with 0.75V max forward voltage at 3A/25°C, 100µA max reverse leakage at 50V/25°C, and 70A surge capability - used in automotive DC/DC converters and reverse battery protection circuits.
For engineers reviewing the SK35BH datasheet, SK35BH pinout, SK35BH application, or SK35BH equivalent, this page delivers verified electrical parameters, thermal resistance (RθJL = 23°C/W), junction temperature range (–55°C to +150°C), and AEC-Q101 qualification status for automotive-grade reliability assessment.
Technical Context
The SK35BH implements a single-die Schottky structure optimized for low forward voltage drop and fast switching, enabling high-efficiency operation in 20–200V-rated rectifier families. Its guard ring design provides overvoltage protection, and JESD201 Class 2 whisker resistance ensures long-term solder joint integrity under thermal cycling.
Rated for continuous 3A forward current and 70A non-repetitive surge (8.3ms half-sine), it operates across –55°C to +150°C junction temperature with RθJA = 63°C/W and RθJL = 23°C/W - supporting thermally constrained PCB layouts in automotive lighting and power supply freewheeling applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse voltage; defines safe blocking capability in 12V/24V automotive systems |
| IF | 3 A - continuous forward current rating; supports mid-power DC/DC output rectification |
| VF (max) | 0.75 V @ 3A, 25°C - low conduction loss enables >92% efficiency in 5V–12V buck converters |
| IR (max) | 100 µA @ 50V, 25°C - minimal leakage preserves battery standby life in reverse polarity protection |
| IFSM | 70 A - surge withstand for load dump transients in automotive electrical systems |
| TJ Range | –55°C to +150°C - qualified for under-hood automotive environments per AEC-Q101 |
| RθJL | 23 °C/W - enables direct thermal coupling to copper pour or heatsink for sustained 3A operation |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode-indicated band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side of rectifier path; requires adequate trace width for 3A continuous current |
| Cathode | Forward current exit / reverse voltage reference | Marked by band; ties to output/load side; serves as reference node for reverse leakage and voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock testing |
| Guard ring overvoltage protection | Enhances ruggedness against transient voltage spikes without external snubbers |
| Moisture sensitivity level 1 | No bake requirement before reflow; compatible with standard SMT assembly lines |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
| High surge current capability (70A) | Withstands automotive load dump events per ISO 7637-2 without degradation |
Applications
| Automotive DC/DC Converters | Reverse Battery Protection |
|---|---|
Use Scenario: Step-down conversion in 12V/48V hybrid vehicle subsystems powering infotainment and ADAS sensors. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck topology. Use Value: 0.75V VF reduces conduction loss by ~35% vs. comparable 1N5822, improving thermal margin at 3A load. | Use Scenario: Preventing damage during incorrect battery terminal connection in body control modules. IC Role / Device Role / Timing Role: Series-connected reverse polarity protection diode on main power rail. Use Value: 100µA IR at 25°C minimizes quiescent drain, preserving ECU sleep-mode battery life over years. |
| Car Lighting Systems | Freewheeling Diodes in Relay Drivers |
Use Scenario: LED headlamp driver power stage where thermal management is space-constrained. IC Role / Device Role / Timing Role: Freewheeling path for inductive current decay in buck-based LED current regulation. Use Value: RθJL = 23°C/W allows direct mounting to metal-core PCB, eliminating need for external heatsink. | Use Scenario: Clamping inductive kickback from 12V relay coils in door module actuators. IC Role / Device Role / Timing Role: Fast recovery freewheeling diode across relay coil terminals. Use Value: Schottky architecture enables <10ns reverse recovery, preventing MOSFET shoot-through in H-bridge drivers. |
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-3EYH05-M3/45 | Same 3A/50V rating, but VF = 0.52V typ @ 3A; TO-277 package (smaller footprint than SMB) | Better efficiency at light loads; lower thermal mass limits sustained 3A operation without heatsinking | Prefer when board space is critical and peak current is intermittent |
| ON Semiconductor SB350 | 3A/50V, VF = 0.55V typ @ 3A; DO-214AA package; not AEC-Q101 qualified | Lacks automotive qualification; higher IR (500µA) reduces suitability for battery-sensitive systems | Select only for cost-sensitive industrial or consumer applications without automotive requirements |
Compared with VS-3EYH05-M3/45 and SB350, the SK35BH delivers superior thermal robustness (RθJL = 23°C/W) and automotive qualification, making it the preferred choice for under-hood 12V systems requiring long-term reliability and surge resilience.
Availability
SK35BH is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and car lighting systems requiring stable component supply across extended production lifecycles.
Supply support for SK35BH 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 automotive, industrial, and computing markets since 1979.
The SK35BH belongs to TSC's AEC-Q101-qualified SKx BH Schottky rectifier family, engineered specifically for high-reliability 12V/24V automotive power systems demanding low VF, high surge tolerance, and extended temperature operation.
FAQ
What is the maximum junction temperature rating for the SK35BH?
The SK35BH has a maximum junction temperature (TJ) rating of +150°C, validated per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments where ambient temperatures exceed 105°C. The device maintains specified electrical performance up to this limit, provided thermal design meets RθJL = 23°C/W and RθJA = 63°C/W constraints. Derating curves in the SK35BH datasheet confirm 3A continuous current is sustainable at 150°C junction temperature with appropriate PCB copper area.
Is the SK35BH pin-compatible with other parts in the SK3xBH series?
Yes, all SK3xBH devices - including SK32BH through SK320BH - share identical DO-214AA (SMB) package dimensions, anode/cathode pinout, and thermal pad layout. The SK35BH uses the same physical footprint and solder mask pattern as SK33BH, SK34BH, and SK36BH, enabling voltage-scaling design reuse without PCB revision. However, forward voltage and reverse leakage differ across the series, so electrical validation is required when substituting within the same layout.
Does the SK35BH require a moisture sensitivity bake prior to reflow soldering?
No, the SK35BH is rated at Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it has unlimited floor life and does not require baking before reflow. This simplifies SMT line integration and eliminates risk of popcorning during lead-free reflow profiles. The device's molding compound and leadframe construction meet strict humidity resistance standards, ensuring reliability in high-volume automotive assembly environments.
What is the reverse leakage current specification for the SK35BH at elevated temperature?
At 100°C junction temperature and rated 50V reverse voltage, the SK35BH specifies a maximum reverse leakage current (IR) of 5 mA. At 125°C, leakage rises to ≤2 mA - a value confirmed in the "Electrical Specifications" table of the official SK35BH datasheet. This controlled leakage profile supports stable operation in hot under-hood locations while maintaining acceptable quiescent current in always-on automotive modules.
How does the guard ring feature in the SK35BH improve system-level reliability?
The guard ring in the SK35BH enhances edge termination robustness, suppressing premature avalanche breakdown during voltage transients such as ISO 7637-2 pulse 1 and pulse 4a. This structural feature increases the device's dV/dt rating to 10,000 V/µs and improves immunity to localized electric field crowding. In practice, it extends operational lifetime in automotive power rails exposed to load dump and jump-start conditions - a key differentiator versus non-guard-ring Schottky rectifiers like SB350.
SK35BH 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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK35BH FAQ
1.How can I place an order for SK35BH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35BH 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 SK35BH reliable?
The price and inventory of SK35BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35BH is usually 5 days.
3.What payment methods are accepted for SK35BH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35BH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35BH?
SK35BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35BH 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 SK35BH?
For technical support, including SK35BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35BH requirements.
6.How does Aetrix verify that SK35BH is sourced from the original manufacturer or authorized distributors?
All SK35BH 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 SK35BH meets industry standards.
7.What is the process for return or replacement of SK35BH?
All SK35BH units undergo pre-shipment inspection (PSI). If there is an issue with SK35BH, 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 SK35BH part is unused and in its original packaging.
Return procedure for SK35BH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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