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Taiwan Semiconductor Corporation SK24AH
- Part No.:
- SK24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK24AH.pdf
- Description:
- DIODE SCHOTTKY 40V 2A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,377
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Product details
Overview
SK24AH from Taiwan Semiconductor is a 2 A, 40 V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, qualified to AEC-Q101, with 0.50 V forward voltage at 2 A and 25 °C, 50 A surge capability, and 125 °C maximum junction temperature. It serves as a freewheeling or reverse-battery protection diode in automotive lighting and DC/DC converters.
For engineers reviewing the SK24AH datasheet, SK24AH pinout, SK24AH application, or SK24AH equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, low VF for high efficiency, AEC-Q101 qualification for automotive use, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated placement systems.
Technical Context
The SK24AH implements a single-die Schottky structure optimized for low forward voltage drop and fast switching, enabling high-frequency operation without minority-carrier recovery delay. Its guard ring design enhances over-voltage robustness, while the matte tin-plated leads ensure solderability per J-STD-002.
Thermal performance is defined by an 88 °C/W junction-to-ambient thermal resistance under standard PCB mounting conditions. The device operates across –55 °C to +125 °C junction temperature range and supports repetitive surge currents up to 50 A (8.3 ms half-sine), making it suitable for transient-heavy automotive power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in reverse-biased applications like reverse battery protection. |
| IF | 2 A - Continuous forward current rating; determines steady-state power delivery capacity in DC/DC output stages. |
| VF | 0.50 V @ 2 A, 25 °C - Low conduction loss enables >92% efficiency in 5–12 V buck converters at full load. |
| IFSM | 50 A - Peak non-repetitive surge current; withstands load dump transients in 12 V automotive systems. |
| TJ max | 125 °C - Maximum junction temperature; sets thermal derating boundary for board-level thermal design. |
| RθJA | 88 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise on standard FR-4 with 1-in² copper pad. |
| IR | 0.5 mA @ 40 V, 25 °C - Low leakage ensures minimal standby power loss in always-on vehicle modules. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with cathode band marking; meets UL 94V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., ground or switch node) in freewheeling configuration; requires thermal relief pad for heat dissipation. |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by visible band; connects to higher-potential rail (e.g., input or output); polarity reversal causes catastrophic failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Guard ring structure | Improves edge termination reliability, raising dV/dt capability to 10,000 V/µs and reducing risk of avalanche-induced failure during fast-switching transients. |
| Moisture sensitivity level 1 | Eliminates bake preconditioning prior to reflow; compatible with standard SMT assembly lines without floor-life restrictions. |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IEC 61249-2-21, supporting environmentally regulated automotive and industrial supply chains. |
Applications
| Automotive LED Headlamp Driver | 12 V Automotive DC/DC Converter Output Stage |
|---|---|
Use Scenario: High-brightness LED arrays powered via constant-current buck drivers in modern headlamps. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during MOSFET off-time in synchronous or asynchronous buck topologies. Use Value: 0.50 V VF minimizes conduction loss and thermal stress, extending LED driver lifetime and maintaining lumen stability under ambient temperatures up to 105 °C. | Use Scenario: Secondary-side rectification in isolated 12 V → 5 V/3.3 V flyback or forward converters for infotainment ECUs. IC Role / Device Role / Timing Role: Output rectifier converting transformer secondary AC to regulated DC; operates at 100–500 kHz switching frequencies. Use Value: Fast recovery and zero minority-carrier storage enable clean waveform integrity and reduce EMI filtering burden compared to PN diodes. |
| Reverse Battery Protection Circuit | Start-Stop System Power Rail Clamp |
Use Scenario: Preventing damage from accidental reverse connection of 12 V battery terminals during service or jump-starting. IC Role / Device Role / Timing Role: Series-connected anode-to-load, cathode-to-battery configuration acting as polarity-sensitive pass element. Use Value: 40 V VRRM and 50 A IFSM tolerate 24 V jump-start surges and load dump spikes without breakdown or latch-up. | Use Scenario: Clamping transient overvoltage on 12 V main rail during engine cranking and restart events in micro-hybrid vehicles. IC Role / Device Role / Timing Role: Shunt-connected cathode-to-rail, anode-to-ground configuration absorbing energy during voltage overshoots. Use Value: Guard ring-enhanced dV/dt immunity (10,000 V/µs) prevents false triggering during rapid bus transients, ensuring stable MCU operation. |
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-2EJH04-M3/5BT | Same DO-214AC package, 2 A/40 V rating, but VF = 0.52 V @ 2 A and TJ max = 150 °C. | Higher TJ max allows operation in hotter under-hood zones; slightly higher VF increases conduction loss by ~4 mW at 2 A. | Select when extended temperature margin is prioritized over minimal conduction loss. |
| ON Semiconductor SB240-E3/54 | DO-214AA (SMB) package, 2 A/40 V, VF = 0.55 V @ 2 A, TJ max = 125 °C, no AEC-Q101 qualification. | Larger footprint limits board space efficiency; absence of AEC-Q101 restricts use to non-automotive industrial designs. | Select only for cost-sensitive non-automotive applications where SMB layout is already standardized. |
Compared with VS-2EJH04-M3/5BT and SB240-E3/54, the SK24AH delivers the lowest forward voltage in its class with automotive-grade reliability, making it optimal for thermally constrained, safety-critical 12 V systems where efficiency and qualification compliance are jointly required.
Availability
SK24AH is available at Aetrix Electronics and suitable for automotive LED lighting, 12 V DC/DC converter output stages, and reverse battery protection circuits requiring stable component supply and long-term production continuity.
Supply support for SK24AH 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 consumer markets since 1979.
The SK22AH–SK215AH series was developed specifically for high-efficiency, AEC-Q101-compliant power conversion in automotive subsystems-emphasizing low VF, robust surge handling, and surface-mount manufacturability for next-generation lighting and start-stop electronics.
FAQ
What is the maximum junction temperature rating for SK24AH?
The SK24AH has a maximum junction temperature (TJ) rating of +125 °C, verified per absolute maximum ratings table in the official datasheet. This specification applies under continuous forward conduction at rated current and defines the upper thermal boundary for reliable operation. Derating is required above this temperature, and the device must be mounted on PCBs with adequate copper area to maintain TJ ≤ 125 °C under worst-case ambient and power dissipation conditions. The SK24AH is not rated for 150 °C operation-only higher-voltage variants (e.g., SK29AH–SK215AH) specify +150 °C TJ max.
Is SK24AH AEC-Q101 qualified and what does that cover?
Yes, the SK24AH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This qualification covers stress testing for high-temperature operating life, temperature cycling, highly accelerated stress test (HAST), unbiased highly accelerated stress test (uHAST), and mechanical shock-all performed on the DO-214AC packaged SK24AH lot. AEC-Q101 validation confirms suitability for automotive powertrain and body electronics, but does not extend to medical or safety-critical ASIL-D functions. The SK24AH's qualification status is documented in Taiwan Semiconductor's C2307 revision datasheet.
What is the forward voltage of SK24AH at 2 A and 100 °C junction temperature?
The forward voltage (VF) of the SK24AH is not specified at 100 °C in the published datasheet. The datasheet provides VF = 0.50 V (max) only at IF = 2 A and TJ = 25 °C. At elevated temperatures, VF decreases-typical Schottky behavior-but no guaranteed value is given for 100 °C. Engineers should refer to Figure 4 (Typical Forward Characteristics) in the SK22AH–SK215AH datasheet, which shows VF ≈ 0.42 V at 2 A and 100 °C for SK22AH–SK24AH variants, though this is a typical curve, not a guaranteed limit.
Does SK24AH have a guard ring and why is it important?
Yes, the SK24AH incorporates a guard ring structure, explicitly listed under FEATURES in the datasheet. This design enhances edge termination robustness, increasing the device's critical rate of rise of off-state voltage (dV/dt) to 10,000 V/µs. In automotive applications-especially in start-stop systems or motor drives-the guard ring prevents premature avalanche breakdown during fast voltage transients, improving reliability in noisy 12 V rail environments where dV/dt can exceed 5,000 V/µs during load dump or relay switching.
What packaging and reel quantity is available for SK24AH?
The SK24AH is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, per the ORDERING INFORMATION section of the datasheet. The marking code "SK24A" appears on the device body, with "H" denoting halogen-free construction. No alternate packaging (e.g., bulk, ammo pack, or smaller reels) is listed in the official documentation. Tape-and-reel delivery supports automated pick-and-place assembly and complies with J-STD-020 moisture sensitivity level 1 handling requirements.
SK24AH 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):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 2 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
SK24AH FAQ
1.How can I place an order for SK24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK24AH 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 SK24AH reliable?
The price and inventory of SK24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK24AH is usually 5 days.
3.What payment methods are accepted for SK24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK24AH?
SK24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK24AH 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 SK24AH?
For technical support, including SK24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK24AH requirements.
6.How does Aetrix verify that SK24AH is sourced from the original manufacturer or authorized distributors?
All SK24AH 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 SK24AH meets industry standards.
7.What is the process for return or replacement of SK24AH?
All SK24AH units undergo pre-shipment inspection (PSI). If there is an issue with SK24AH, 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 SK24AH part is unused and in its original packaging.
Return procedure for SK24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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