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Taiwan Semiconductor Corporation SK35AH
- Part No.:
- SK35AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK35AH.pdf
- Description:
- DIODE SCHOTTKY 50V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,129
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Product details
Overview
SK35AH from Taiwan Semiconductor is a 3A, 50V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, featuring 0.72V forward voltage at 3A/25°C, 200μA reverse leakage at 50V/25°C, and AEC-Q101 qualification for automotive-grade reliability. It serves as a freewheeling or reverse-battery protection diode in DC/DC converters and car lighting systems.
For engineers reviewing the SK35AH datasheet, SK35AH pinout, SK35AH application, or SK35AH equivalent, key selection criteria include its 50V VRRM, low VF trade-off vs. IR, thermal resistance (RθJL = 25°C/W), and SMA package compatibility with automated SMT assembly.
Technical Context
The SK35AH implements a single-die Schottky junction optimized for high-frequency switching in low-voltage power conversion. Its 50V peak reverse voltage and 70A non-repetitive surge rating support robust operation during load transients in automotive DC/DC stages.
Thermal performance is defined by RθJL = 25°C/W and RθJA = 66°C/W, enabling sustained 3A conduction under typical PCB copper area. The guard ring structure provides over-voltage protection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum reverse blocking capability for 12V/24V automotive bus protection |
| IF | 3 A - Continuous forward current rating at TL = 90°C, suitable for mid-power converter outputs |
| VF @ 3A, 25°C | 0.72 V - Low conduction loss enabling >92% efficiency in 5V–12V buck stages |
| IR @ 50V, 25°C | 200 μA - Minimal standby leakage for battery-sensitive applications like always-on lighting |
| IFSM | 70 A - Withstands 8.3ms half-sine surges common in motor commutation and load dump events |
| TJ max | 150 °C - Enables operation in under-hood environments with limited airflow |
| RθJL | 25 °C/W - Efficient heat transfer to PCB copper, reducing need for oversized thermal pads |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode indicated by molded band; leads are matte tin-plated, J-STD-002 solderable, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input | Connected to source-side of switching node; requires low-inductance trace routing |
| Cathode | Forward current output / reverse voltage reference | Marked by band; ties to output rail or ground return path in freewheeling configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature cycling, mechanical shock, and humidity testing per stress test plan |
| Guard ring structure | Prevents edge breakdown at rated VRRM, eliminating need for external snubbers in 50V systems |
| Low VF / IR trade-off | Optimized for 50V class: 0.72V VF balances conduction loss against 200μA IR at room temperature |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT lines without dry pack handling |
Applications
| DC/DC Converter Output Rectification | Reverse Battery Protection |
|---|---|
Use Scenario: Step-down conversion from 12V or 24V automotive battery to 3.3V/5V logic rails in infotainment modules. IC Role / Device Role / Timing Role: Freewheeling diode in asynchronous buck topology, conducting during low-side switch off-time. Use Value: 0.72V VF minimizes power loss at 3A load; 70A IFSM handles startup inrush without derating. | Use Scenario: Preventing damage when battery terminals are accidentally reversed during service or jump-start. IC Role / Device Role / Timing Role: Series-connected anode-to-load, blocking reverse polarity while passing normal forward current. Use Value: 50V VRRM exceeds 24V system transients; 200μA IR ensures negligible quiescent drain on backup power sources. |
| Car Interior Lighting Driver | Low-Voltage Inverter Freewheeling |
Use Scenario: Constant-current LED driver for dome lights or map lamps powered from vehicle battery. IC Role / Device Role / Timing Role: Output rectifier in boost-derived constant-current stage, conducting during energy transfer phase. Use Value: AEC-Q101 qualification ensures reliability across -40°C to +125°C ambient; SMA package fits compact LED module footprints. | Use Scenario: High-frequency inverter driving small BLDC fans or solenoids in HVAC control units. IC Role / Device Role / Timing Role: Freewheeling path for inductive kickback during PWM switching transitions. Use Value: 10,000 V/μs dV/dt rating prevents false turn-on during fast-switching; 150°C TJ max supports sealed enclosure operation. |
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 50V VRRM, 3A IF, but VF = 0.75V @ 3A; RθJA = 70°C/W vs. SK35AH's 66°C/W | Slightly higher conduction loss; identical AEC-Q101 qualification and SMA package | Preferred where ON Semi supply chain alignment is required; verify thermal margin with layout |
| SB350 (Vishay) | 50V VRRM, 3A IF, VF = 0.70V @ 3A, but IR = 500μA @ 50V/25°C vs. SK35AH's 200μA | Higher leakage may impact ultra-low-power always-on circuits; same DO-214AC footprint | Consider for cost-sensitive non-battery-critical applications where lower VF outweighs leakage penalty |
Compared with SS35H and SB350, the SK35AH offers the best balance of low leakage (200μA) and moderate VF (0.72V) in AEC-Q101-compliant SMA packaging, making it optimal for automotive power rails where both efficiency and standby integrity matter.
Availability
SK35AH is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and car interior lighting systems requiring stable component supply and AEC-Q101 compliance.
Supply support for SK35AH 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 automotive, industrial, and consumer markets since 1979.
The SK32AH–SK320AH family is designed specifically for high-reliability automotive power conversion, emphasizing AEC-Q101 qualification, low VF/IR optimization per voltage grade, and robust thermal performance in surface-mount packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for SK35AH?
The SK35AH has a VRRM of 50 V, confirmed in the Absolute Maximum Ratings table. This rating defines the highest reverse voltage the device can block repeatedly without breakdown, making it suitable for 24V automotive systems with transient margins. The SK35AH is part of the SK3xAH series where "x" denotes voltage grade - SK35AH explicitly corresponds to 50V.
Is SK35AH qualified for automotive applications?
Yes, SK35AH is AEC-Q101 qualified, as stated in the FEATURES section. This qualification covers stress tests including temperature cycling, mechanical shock, and humidity exposure, validating its suitability for under-hood and cabin automotive electronics. The SK35AH meets this standard as a discrete Schottky rectifier, not as a packaged IC.
What is the forward voltage drop of SK35AH at rated current?
The SK35AH exhibits a typical forward voltage (VF) of 0.72 V at 3 A and 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and reflects conduction loss during normal operation. At higher junction temperatures, VF decreases slightly due to Schottky diode physics.
Does SK35AH have a guard ring structure?
Yes, SK35AH incorporates a guard ring for over-voltage protection, as explicitly listed in the FEATURES section. This structure mitigates edge breakdown effects at the silicon periphery, improving reliability under voltage stress without requiring external protection components in 50V-class designs.
What package type does SK35AH use and is it RoHS compliant?
SK35AH uses the DO-214AC (SMA) surface-mount package, confirmed in MECHANICAL DATA and ORDERING INFORMATION. It is RoHS compliant and halogen-free, with matte tin-plated leads meeting J-STD-002 solderability requirements. The moisture sensitivity level is Level 1, eliminating bake requirements prior to reflow.
SK35AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- 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:
- 720 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK35AH FAQ
1.How can I place an order for SK35AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35AH 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 SK35AH reliable?
The price and inventory of SK35AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35AH is usually 5 days.
3.What payment methods are accepted for SK35AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35AH?
SK35AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35AH 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 SK35AH?
For technical support, including SK35AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35AH requirements.
6.How does Aetrix verify that SK35AH is sourced from the original manufacturer or authorized distributors?
All SK35AH 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 SK35AH meets industry standards.
7.What is the process for return or replacement of SK35AH?
All SK35AH units undergo pre-shipment inspection (PSI). If there is an issue with SK35AH, 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 SK35AH part is unused and in its original packaging.
Return procedure for SK35AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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