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Taiwan Semiconductor Corporation SK39AH
- Part No.:
- SK39AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK39AH.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,564
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Product details
Overview
SK39AH from Taiwan Semiconductor is a 3A, 90V Schottky barrier rectifier in DO-214AC (SMA) package, designed for high-frequency DC/DC conversion and reverse battery protection. It features 0.85V forward voltage at 3A and 100μA reverse leakage at 90V and 25°C, with AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SK39AH datasheet, SK39AH pinout, SK39AH application, or SK39AH equivalent, key selection criteria include its 90V VRRM, low VF at rated current, thermal resistance of 25°C/W (junction-to-lead), and suitability for space-constrained automotive lighting and power supply freewheeling circuits.
Technical Context
The SK39AH uses a single-die Schottky junction structure optimized for low conduction loss and fast switching, enabling efficient operation in high-frequency inverters up to several hundred kHz. Its guard ring design enhances over-voltage ruggedness without compromising soft recovery behavior.
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 range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum repetitive reverse voltage; defines safe blocking capability in 12–48V automotive systems |
| IF | 3 A - Continuous forward current rating; supports compact heatsink-free designs in <5W DC/DC stages |
| VF @ 3A, 25°C | 0.85 V - Low conduction loss; reduces power dissipation to ~2.55W at full load |
| IR @ 90V, 25°C | 100 μA - Minimal leakage; preserves efficiency in standby and low-power modes |
| RθJL | 25 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pour cooling without external heatsink |
| TJ max | 150 °C - Maximum operating junction temperature; supports under-hood automotive environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with matte tin-plated leads, cathode indicated by band. Weight: 0.070 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., switch node in buck converter or battery negative in reverse protection) |
| Cathode | Current exit point during forward conduction; marked by band | Connected to higher-potential node (e.g., output rail or battery positive); polarity must be observed to prevent catastrophic failure |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and infotainment power rails |
| Guard ring over-voltage protection | Improves ruggedness against transient spikes without increasing VF or reducing switching speed |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or dry-pack handling |
| Halogen-free & RoHS compliant | Meets global environmental compliance mandates for automotive and industrial end equipment |
Applications
| Automotive LED Lighting | 12V DC/DC Buck Converter |
|---|---|
Use Scenario: Reverse polarity protection for headlamp and DRL modules powered from vehicle battery. IC Role / Device Role / Timing Role: Discrete Schottky diode used as input protection element in front of DC/DC controller ICs. Use Value: Prevents damage from accidental battery reversal while maintaining <0.85V drop at 3A, minimizing thermal stress on PCB traces. | Use Scenario: Freewheeling path in synchronous or non-synchronous buck converters supplying microcontrollers and sensors. IC Role / Device Role / Timing Role: Passive freewheeling diode providing current continuity during high-side MOSFET off-time. Use Value: Enables stable 3A output with minimal voltage overshoot due to fast recovery and low stored charge (Qrr not specified but typical for Schottky). |
| Reverse Battery Protection | Low-Voltage Inverter Output Stage |
Use Scenario: Series-connected protection for aftermarket infotainment or telematics units. IC Role / Device Role / Timing Role: High-current blocking diode placed between battery input and system power rail. Use Value: Withstands 70A surge and blocks reverse current below 100μA at 25°C, ensuring no backfeed into faulty battery connections. | Use Scenario: Output rectification in 24V-to-12V isolated flyback or forward converters for HVAC actuators. IC Role / Device Role / Timing Role: Secondary-side unidirectional current path delivering regulated DC to motor drivers. Use Value: 90V VRRM provides margin above reflected output voltage peaks, supporting reliable operation at >200kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS39HE3/57T (Vishay) | Same 90V VRRM, 3A IF, DO-214AC package; VF = 0.82V @ 3A (25°C), IR = 100μA @ 90V (25°C) | Identical AEC-Q101 qualification and thermal specs; minor VF advantage (~0.03V lower) | Preferred where marginal conduction loss reduction justifies dual-sourcing |
| SB390-E3/57T (Vishay) | 90V VRRM, 3A IF, DO-214AC; VF = 0.87V @ 3A (25°C), IR = 200μA @ 90V (25°C); not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial or consumer DC/DC where qualification is not mandated | Select when cost sensitivity outweighs automotive compliance requirement |
Compared with SK39AH, SS39HE3/57T offers slightly lower forward voltage but identical packaging and qualification, while SB390-E3/57T trades AEC-Q101 compliance for broader commercial availability and marginally higher leakage-making SK39AH optimal for automotive-grade designs requiring guaranteed ruggedness and low IR.
Availability
SK39AH is available at Aetrix Electronics and suitable for automotive LED lighting, reverse battery protection, and 12V DC/DC converter applications requiring stable component supply and long-term lifecycle support.
Supply support for SK39AH 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, TVS diodes, and MOSFETs, with global distribution and automotive qualification capabilities.
The SK32AH–SK320AH family was developed specifically for high-reliability automotive and industrial power conversion, emphasizing low VF, AEC-Q101 compliance, and robust surge handling in compact SMA packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for SK39AH?
The SK39AH has a maximum repetitive peak reverse voltage (VRRM) of 90 V, as confirmed in the Absolute Maximum Ratings table. This rating ensures reliable blocking performance in 48V automotive systems and 24V industrial supplies with appropriate derating. The SK39AH is part of the SK32AH–SK320AH series where "39" explicitly denotes the 90V variant, and this value is consistent across all official TSC documentation versions including B2304.
Is SK39AH qualified for automotive applications?
Yes, SK39AH is AEC-Q101 qualified, as stated in the FEATURES section of the official datasheet. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and other automotive-specific reliability requirements. The device is intended for use in automotive lighting, infotainment power rails, and engine control subsystems where such qualification is mandatory.
What is the forward voltage (VF) of SK39AH at 3A and 25°C?
The forward voltage (VF) of SK39AH is 0.85 V at 3A and 25°C, per the Electrical Specifications table. This value is measured under pulse conditions (PW = 0.3ms) and reflects typical conduction loss in real-world switching applications. At elevated temperatures (e.g., 125°C), VF decreases slightly due to Schottky physics, but the 0.85V figure remains the primary design reference for thermal and efficiency calculations.
Does SK39AH have a specified reverse recovery time (trr)?
No, SK39AH does not specify reverse recovery time (trr) because it is a Schottky barrier diode, which operates via majority-carrier conduction and exhibits negligible stored charge. Instead, the datasheet emphasizes low reverse leakage (100 μA at 90V/25°C) and high dV/dt capability (10,000 V/μs), confirming its suitability for high-frequency switching where trr-related losses would otherwise dominate in PN-junction diodes.
What is the thermal resistance from junction to lead (RθJL) for SK39AH?
The junction-to-lead thermal resistance (RθJL) for SK39AH is 25°C/W, as published in the Thermal Performance section. This parameter enables accurate calculation of lead temperature rise under load and informs PCB copper pour sizing. When mounted on 1-inch² 2-oz copper, RθJA drops from the nominal 66°C/W to ~40°C/W, allowing full 3A operation without forced air or heatsinks in most automotive ambient conditions.
SK39AH 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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK39AH FAQ
1.How can I place an order for SK39AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK39AH 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 SK39AH reliable?
The price and inventory of SK39AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK39AH is usually 5 days.
3.What payment methods are accepted for SK39AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK39AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK39AH?
SK39AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK39AH 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 SK39AH?
For technical support, including SK39AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK39AH requirements.
6.How does Aetrix verify that SK39AH is sourced from the original manufacturer or authorized distributors?
All SK39AH 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 SK39AH meets industry standards.
7.What is the process for return or replacement of SK39AH?
All SK39AH units undergo pre-shipment inspection (PSI). If there is an issue with SK39AH, 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 SK39AH part is unused and in its original packaging.
Return procedure for SK39AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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