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Taiwan Semiconductor Corporation SK34AH
- Part No.:
- SK34AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK34AH.pdf
- Description:
- DIODE SCHOTTKY 40V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:14,705
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Product details
Overview
SK34AH from Taiwan Semiconductor is a 3A, 40V Schottky barrier rectifier in DO-214AC (SMA) package, designed for low-voltage, high-frequency DC/DC conversion and reverse battery protection. It delivers 0.55V forward voltage at 3A/25°C, supports 70A non-repetitive surge current, and operates up to 150°C junction temperature.
For engineers reviewing the SK34AH datasheet, SK34AH pinout, SK34AH application, or SK34AH equivalent, key selection criteria include its AEC-Q101 qualification, 40V repetitive peak reverse voltage, low VF performance, moisture sensitivity level 1 rating, and suitability for automotive lighting and freewheeling diode circuits.
Technical Context
The SK34AH uses a single-die Schottky structure with guard ring over-voltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 25°C/W junction-to-lead thermal resistance enables efficient heat transfer in compact layouts.
Designed for high-efficiency switching applications, it exhibits 500μA max reverse leakage at 40V/25°C and maintains stable operation across -55°C to +150°C storage and junction temperature ranges, meeting JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating range in reverse-biased conditions |
| IF | 3 A - Continuous forward current rating; determines steady-state power handling capability |
| VF @ 3A, 25°C | 0.55 V - Low conduction loss enabling high efficiency in 12V/24V automotive and industrial DC/DC stages |
| IFSM | 70 A - Peak surge current tolerance for transient load events like motor startup or inductive kickback |
| IR @ 40V, 25°C | 500 μA - Minimal leakage ensures low standby power in battery-critical systems such as reverse polarity protection |
| TJ max | 150 °C - High junction temperature rating supports operation in under-hood and enclosed industrial environments |
| RθJL | 25 °C/W - Efficient thermal path from die to lead enables reliable power dissipation without heatsinking in SMA footprint |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with cathode band polarity indicator, 0.070g weight, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of circuit; accepts input current during conduction phase |
| Cathode | Forward current exit / reverse voltage reference | Marked by band; connects to higher-potential node; blocks reverse current up to 40V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Guard ring structure | Enhances ruggedness against transient overvoltage events without requiring external clamping components |
| Moisture sensitivity level 1 | Enables direct placement without baking or dry-pack handling-reduces manufacturing overhead |
| Halogen-free & RoHS compliant | Meets global environmental compliance mandates for automotive and industrial end equipment |
| High surge current capability | 70A IFSM rating supports robust operation in inductive load switching and energy recovery paths |
Applications
| Automotive LED Lighting | 12V DC/DC Buck Converter |
|---|---|
Use Scenario: Powering headlamp or DRL modules in 12V vehicle electrical systems with reverse polarity risk. IC Role / Device Role / Timing Role: Reverse battery protection diode placed at input stage to prevent damage during jump-start or wiring errors. Use Value: 0.55V VF minimizes voltage drop and heat generation, preserving system efficiency while enabling compact SMA layout. | Use Scenario: Freewheeling path in synchronous buck converter for infotainment or ADAS power supplies. IC Role / Device Role / Timing Role: Freewheeling diode conducting during low-side switch off-time to maintain continuous inductor current. Use Value: Fast recovery and low VF reduce switching losses and improve converter efficiency above 200kHz operation. |
| Industrial Motor Control Board | Reverse Polarity Protection Module |
Use Scenario: Clamping flyback energy from brushed DC motors in factory automation actuators. IC Role / Device Role / Timing Role: Snubber or clamp diode absorbing inductive kickback during MOSFET turn-off transitions. Use Value: 70A IFSM withstands repeated surge events; 150°C TJ rating ensures reliability in sealed enclosures. | Use Scenario: Input protection for portable test equipment powered via barrel jack or terminal block. IC Role / Device Role / Timing Role: Series-connected blocking diode preventing damage when external supply is connected with reversed polarity. Use Value: 40V VRRM covers typical 24V/36V industrial rails; low IR avoids excessive standby drain on battery-backed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS34 (ON Semiconductor) | Same 3A/40V rating, VF = 0.55V typ, but not AEC-Q101 qualified; RθJA = 70°C/W vs 66°C/W | Lacks automotive qualification; suitable for commercial-grade DC/DC where qualification isn't mandated | Select SS34 only if AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| SB340 (Good-Ark) | Identical 3A/40V specs and DO-214AC package; VF = 0.55V max, IR = 500μA max at 25°C | Not AEC-Q101 qualified; moisture sensitivity level unspecified-may require bake prior to reflow | SB340 offers pin-compatible alternative where automotive qualification is secondary to cost or availability |
Compared with SK34AH, SS34 lacks AEC-Q101 validation and has slightly higher thermal resistance, while SB340 matches electrical specs but omits automotive qualification and moisture handling documentation-making SK34AH the preferred choice for mission-critical automotive and industrial designs requiring verified reliability.
Availability
SK34AH is available at Aetrix Electronics and suitable for automotive LED lighting, 12V DC/DC converters, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SK34AH 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 is engineered for high-efficiency, high-reliability power conversion in automotive and industrial environments-emphasizing low VF, AEC-Q101 compliance, and robust surge handling in standard SMA packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for SK34AH?
The SK34AH has a VRRM rating of 40 V, meaning it can reliably block up to 40 volts in reverse bias without breakdown. This value is confirmed in the Absolute Maximum Ratings table of the official TSC datasheet Version B2304 and aligns with the "34" in the part number denoting 40V. Exceeding this voltage risks irreversible avalanche failure. The SK34AH must be selected only in circuits where reverse voltage remains within this limit, including margin for transients.
Is SK34AH qualified for automotive applications?
Yes, SK34AH is AEC-Q101 qualified per the manufacturer's documentation, confirming its suitability for automotive power systems including lighting, body control modules, and infotainment power supplies. This qualification covers stress tests for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life. The SK34AH meets these requirements as a discrete Schottky rectifier-not as a controller or IC-and is commonly deployed in reverse battery protection and freewheeling roles in AEC-Q101-compliant designs.
What is the forward voltage (VF) of SK34AH at rated current?
The SK34AH exhibits a maximum forward voltage of 0.55 V at 3 A and 25°C junction temperature, as specified in the Electrical Specifications table. This low VF directly reduces conduction losses in high-current paths. At elevated temperatures (e.g., 100°C), VF decreases slightly due to Schottky physics, but design margins should still be based on the 25°C max value. Pulse testing conditions (0.3ms PW) ensure this value reflects real switching behavior.
Does SK34AH have a defined moisture sensitivity level (MSL)?
Yes, SK34AH is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and placed directly into reflow without baking or dry-pack handling. This simplifies SMT assembly logistics and eliminates floor-life tracking. The MSL Level 1 designation is explicitly stated in the Features section of the TSC datasheet and applies to all SK3xAH variants in DO-214AC packaging.
What package type does SK34AH use, and what are its key mechanical features?
SK34AH uses the DO-214AC (SMA) package: a surface-mount plastic case measuring 4.60 × 2.83 × 2.30 mm, with matte tin-plated leads solderable per J-STD-002 and polarity indicated by a cathode band. Its UL 94V-0 mold compound, 0.070g mass, and JEDEC-compliant outline enable automated placement and compatibility with standard SMA footprints. The package supports 25°C/W junction-to-lead thermal resistance for effective power dissipation.
SK34AH 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):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 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
SK34AH FAQ
1.How can I place an order for SK34AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK34AH 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 SK34AH reliable?
The price and inventory of SK34AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK34AH is usually 5 days.
3.What payment methods are accepted for SK34AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK34AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK34AH?
SK34AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK34AH 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 SK34AH?
For technical support, including SK34AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK34AH requirements.
6.How does Aetrix verify that SK34AH is sourced from the original manufacturer or authorized distributors?
All SK34AH 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 SK34AH meets industry standards.
7.What is the process for return or replacement of SK34AH?
All SK34AH units undergo pre-shipment inspection (PSI). If there is an issue with SK34AH, 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 SK34AH part is unused and in its original packaging.
Return procedure for SK34AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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