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Vishay General Semiconductor - Diodes Division 3KASMC26HE3/9AT
- Part No.:
- 3KASMC26HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC26HE3/9AT.pdf
- Description:
- TVS DIODE 26VWM 46.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,295
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Product details
Overview
3KASMC26HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 42.1 V clamping voltage at 71.3 A surge current, and qualified to AEC-Q101 for automotive electronics protection.
For engineers reviewing the 3KASMC26HE3/9AT datasheet, 3KASMC26HE3/9AT pinout, 3KASMC26HE3/9AT application, or 3KASMC26HE3/9AT equivalent, this device serves as a high-reliability, high-temperature (TJ = 185 °C) clamping solution for inductive switching transients on power rails and signal lines in automotive ECUs, industrial motor drives, and sensor interfaces where fast response (<1 ns), low incremental surge resistance, and MSL Level 1 reflow compatibility are critical.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under repetitive surge stress and elevated temperature operation. Its unidirectional architecture provides forward conduction capability while clamping reverse transients above VBR with minimal voltage overshoot.
Designed for compliance with ANSI/IEEE C62.35 surge standards, it delivers 3000 W peak pulse power handling with 10/1000 μs waveform, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and maintains stable clamping performance across -65 °C to +185 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC rail margin. |
| VBR (min/max) | 28.9 V / 31.9 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 42.1 V - Clamped voltage at 71.3 A peak pulse current; determines maximum protected-circuit overvoltage exposure. |
| PPPM | 3000 W - Peak transient energy absorption capacity per 10/1000 μs waveform; enables robust ESD and load-dump survival. |
| TJ max. | +185 °C - Maximum junction temperature rating; supports under-hood automotive placement without derating penalties. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance testing. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11 mm × 6.22 mm footprint and 3.20 mm height; compatible with automated assembly. |
Pinout & Package
DO-214AB (SMC) package with cathode indicated by molded band; two-terminal device with anode and cathode leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected circuit ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Clamping voltage reference / Surge current sink | Connected to protected line (e.g., 24 V rail or CAN_H); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable leakage and VBR over lifetime and thermal cycling. |
| MSL Level 1 | Rated for peak reflow of 260 °C; eliminates moisture sensitivity concerns and pre-bake requirements in SMT line. |
| Low incremental surge resistance | Minimizes dynamic voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving system immunity. |
| High TJ capability | 185 °C junction rating allows direct mounting near heat sources (e.g., power MOSFETs, motor drivers) without thermal derating. |
| Uni-directional polarity | Enables DC-biased rail protection (e.g., 12 V/24 V systems) with forward conduction capability for reverse-polarity fault tolerance. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 16750-2) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and downstream regulator input. Use Value: Limits peak voltage to ≤42.1 V during 3000 W surges, preventing damage to 36 V-rated LDOs and microcontrollers. |
Use Scenario: Protecting encoder feedback lines and enable signals in servo drive control boards exposed to motor commutation noise. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on differential analog inputs and digital command lines. Use Value: Clamps sub-100 ns spikes to <45 V while maintaining <1 nA leakage at 26 V, preserving signal integrity and ADC accuracy. |
| Automotive Sensor Interface Protection | Telecom Power Supply Input Protection |
Use Scenario: Safeguarding LIN bus transceivers and pressure/temperature sensor front-ends against ESD and inductive kickback. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to connector pins on PCB edge. Use Value: Responds in <1 ns to ±30 kV contact ESD (IEC 61000-4-2), limiting voltage to 42.1 V and surviving >1000 surges per AEC-Q101. |
Use Scenario: Guarding primary-side DC input of telecom AC/DC converters against lightning-induced surges (IEC 61000-4-5). IC Role / Device Role / Timing Role: First-stage clamping device upstream of bulk capacitor and PFC controller. Use Value: Absorbs 3000 W peak energy from 10/1000 μs surges without thermal runaway, enabling compact board layout with no heatsink required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower PPPM (400 W), smaller SMA package (DO-214AC), lower TJ max. (150 °C), same VWM/VBR range. | Not suitable for automotive under-hood use or high-energy load-dump events; limited to consumer/industrial low-power rails. | Select only if space-constrained and surge energy <500 W; verify thermal margin at 125 °C ambient. |
| SMCJ26A | Same DO-214AB package and 3000 W rating, but VBR min/max tighter (28.9–31.9 V vs. 28.9–32.1 V), slightly higher VC (43.0 V). | Functionally interchangeable in most designs; minor clamping voltage difference may affect margin in 36 V systems. | Valid drop-in alternative with identical footprint and thermal profile; confirm VC margin in final schematic simulation. |
Compared with SMAJ26A and SMCJ26A, the 3KASMC26HE3/9AT offers identical package and surge rating to SMCJ26A but superior high-temperature stability (185 °C vs. 150 °C), while differing from SMAJ26A in both energy capacity and thermal robustness-making it the preferred choice for AEC-Q101-compliant automotive power domains.
Availability
3KASMC26HE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, and telecom power supply input stages requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant transient protection.
Supply support for 3KASMC26HE3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® (Protected Anisotropic Rectifier) transient voltage suppressor family, engineered specifically for high-temperature, high-energy automotive and industrial environments where standard TVS devices fail prematurely.
FAQ
What is the clamping voltage of the 3KASMC26HE3/9AT at its rated peak pulse current?
The 3KASMC26HE3/9AT has a maximum clamping voltage (VC) of 42.1 V at its specified peak pulse current (IPPM) of 71.3 A, measured using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on the protected circuit during a full-rated transient event and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The 3KASMC26HE3/9AT achieves this clamping performance while maintaining low incremental surge resistance, minimizing voltage overshoot beyond VC.
Is the 3KASMC26HE3/9AT suitable for automotive under-hood applications?
Yes, the 3KASMC26HE3/9AT is explicitly qualified to AEC-Q101 and rated for a maximum junction temperature of +185 °C, making it suitable for under-hood automotive applications such as engine control modules, transmission control units, and ADAS power supplies. Its DO-214AB package meets MSL Level 1, and its passivated junction ensures long-term reliability under thermal cycling and humidity exposure-key requirements validated in the AEC-Q101 stress test suite. The 3KASMC26HE3/9AT is designed for this environment.
What does the 'HM3/9AT' suffix indicate in the 3KASMC26HE3/9AT part number?
The 'HM3' suffix denotes Vishay's RoHS-compliant, AEC-Q101-qualified base part with matte tin-plated leads and JESD 201 Class 2 whisker resistance. The '/9AT' indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This configuration ensures compatibility with high-speed pick-and-place equipment and supports volume manufacturing. The full designation 3KASMC26HE3/9AT uniquely identifies this specific variant of the 3KASMC26A device.
How does the 3KASMC26HE3/9AT compare to standard SMAJ-series TVS diodes in surge handling?
The 3KASMC26HE3/9AT delivers 3000 W peak pulse power (10/1000 μs), seven times higher than the 400 W rating of SMAJ26A, and uses the larger DO-214AB (SMC) package for superior thermal dissipation. It also supports 200 A forward surge current (8.3 ms) versus 40 A for SMAJ26A, and operates up to +185 °C junction temperature versus +150 °C. These differences make the 3KASMC26HE3/9AT appropriate for demanding automotive load-dump protection where SMAJ26A would fail thermally or electrically.
Does the 3KASMC26HE3/9AT require a heatsink for typical automotive operation?
No, the 3KASMC26HE3/9AT does not require an external heatsink under normal transient conditions due to its low thermal resistance (RθJL = 18.3 °C/W) and high junction temperature rating (+185 °C). Its DO-214AB package is designed for efficient conduction through PCB copper, and the device is rated for 6.0 W steady-state power dissipation on an infinite heatsink at TL = 75 °C. In practice, the 3KASMC26HE3/9AT relies on PCB copper area for thermal management, not added heatsinks.
3KASMC26HE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 64.4A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC26HE3/9AT FAQ
1.How can I place an order for 3KASMC26HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC26HE3/9AT 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 3KASMC26HE3/9AT reliable?
The price and inventory of 3KASMC26HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC26HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC26HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC26HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC26HE3/9AT?
3KASMC26HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC26HE3/9AT 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 3KASMC26HE3/9AT?
For technical support, including 3KASMC26HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC26HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC26HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC26HE3/9AT 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 3KASMC26HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC26HE3/9AT?
All 3KASMC26HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC26HE3/9AT, 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 3KASMC26HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC26HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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