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Vishay General Semiconductor - Diodes Division 3KASMC26HE3/57T
- Part No.:
- 3KASMC26HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC26HE3/57T.pdf
- Description:
- TVS DIODE 26VWM 46.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,946
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Product details
Overview
3KASMC26HE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 26 V stand-off voltage (VWM), 42.1 V clamping voltage at 71.3 A peak surge current, and qualified to AEC-Q101 for automotive-grade reliability.
For engineers reviewing the 3KASMC26HE3/57T datasheet, 3KASMC26HE3/57T pinout, 3KASMC26HE3/57T application, or 3KASMC26HE3/57T equivalent, this device serves as a high-energy, fast-response overvoltage protection component for sensitive signal lines and power rails in harsh thermal environments up to TJ = 185 °C.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability under repetitive surge stress. Its unidirectional polarity enables integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
It delivers 3000 W peak pulse power with low incremental surge resistance and sub-nanosecond response time, meeting MSL Level 1 (260 °C reflow) and supporting high-reliability automotive applications requiring TJ = 185 °C operation and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 28.9 V / 31.9 V - breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 42.1 V - clamped voltage across device at 71.3 A peak surge current, limiting downstream voltage stress |
| PPPM | 3000 W - peak pulse power handling capability per 10/1000 μs waveform, critical for inductive load switching transients |
| TJ max. | 185 °C - maximum junction temperature rating, enabling use in under-hood automotive electronics |
| AEC-Q101 | Qualified - certified for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT |
| RθJA | 77.5 °C/W - thermal resistance from junction to ambient, used to calculate temperature rise under steady-state power dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0 flammability rating and J-STD-002 solderability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or clamping | Connected to lower-potential side of protected line; defines unidirectional clamping direction |
| Cathode | Current exit terminal during clamping; marked with color band | Connected to higher-potential side (e.g., VCC rail); determines polarity and clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable breakdown voltage and leakage performance over lifetime and temperature |
| High-temperature operation | Rated for continuous operation up to TJ = 185 °C, supporting placement near heat sources in engine control units |
| Peak pulse power | 3000 W capability enables robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surge events |
| Fast response time | Sub-nanosecond clamping onset limits voltage overshoot on microcontroller I/O or sensor signal lines |
| Low incremental surge resistance | Minimizes voltage rise during high-current transients, improving clamping efficiency and reducing energy dissipation |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp surges above 26 V while blocking normal reverse bias. Use Value: Limits peak rail voltage to ≤42.1 V during 3000 W transients, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure or temperature sensors connected to PLC inputs. IC Role / Device Role / Timing Role: TVS mounted at sensor connector to absorb ESD and cable-induced surges before reaching precision ADC front-end. Use Value: Clamps transients within nanoseconds while maintaining <1 μA leakage at 26 V, preserving sensor accuracy and offset stability. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding 24 V DC input of PoE-powered network switches from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input rail, coordinated with upstream fuse and secondary filtering. Use Value: Withstands repeated 10/1000 μs surges up to 3000 W without degradation, ensuring long-term field reliability. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: TVS placed across motor terminals to clamp flyback voltage spikes generated during PWM commutation. Use Value: Handles 200 A non-repetitive forward surge (IFSM), protecting MOSFET half-bridge drivers from avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower PPPM (400 W), same VWM (26 V), DO-214AC (SMA) package, RθJA = 110 °C/W | Not suitable for automotive under-hood use due to TJ max = 150 °C and insufficient surge margin for load dump | Select only for cost-sensitive consumer applications with lower surge exposure and ambient <85 °C |
| SMCJ26A | Same PPPM (3000 W), same DO-214AB (SMC) package, but VWM = 26 V, VC = 42.1 V, TJ max = 175 °C, not AEC-Q101 qualified | Lacks automotive qualification; acceptable for industrial controls but requires additional system-level validation for automotive deployment | Choose when AEC-Q101 is not mandated and full 185 °C operation is unnecessary |
Compared with SMAJ26A and SMCJ26A, the 3KASMC26HE3/57T provides superior thermal margin (185 °C vs. 150–175 °C), guaranteed AEC-Q101 compliance, and identical mechanical footprint-making it the only option qualified for direct replacement in production automotive modules without derating or requalification.
Availability
3KASMC26HE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, telecom DC input protection, and consumer appliance motor drive protection requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC26HE3/57T 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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade components.
The 3KASMC series belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for demanding automotive and industrial environments where sustained high-temperature operation and repeatable surge immunity are mandatory.
FAQ
What is the clamping voltage of the 3KASMC26HE3/57T at its rated peak surge current?
The 3KASMC26HE3/57T has a maximum clamping voltage (VC) of 42.1 V at its specified peak pulse current (IPPM) of 71.3 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during transient events. The 3KASMC26HE3/57T maintains this clamping performance across its full operating temperature range up to TJ = 185 °C.
Is the 3KASMC26HE3/57T suitable for automotive applications?
Yes, the 3KASMC26HE3/57T is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood automotive applications such as engine control units, body control modules, and ADAS power supplies. Its DO-214AB (SMC) package meets MSL Level 1 reflow requirements, and its passivated junction ensures long-term reliability under thermal cycling and humidity stress. The 3KASMC26HE3/57T is explicitly designed for automotive-grade surge immunity.
What does the "HM3/57T" suffix indicate in 3KASMC26HE3/57T?
The "HM3" suffix denotes RoHS-compliant, AEC-Q101-qualified construction with JESD201 Class 2 whisker resistance; "57T" specifies the preferred packaging: 7-inch diameter plastic tape and reel, 850 units per reel. This ordering code ensures traceable, automotive-grade material flow and matches Vishay's standard delivery format for high-volume production. The 3KASMC26HE3/57T is shipped in this configuration with full lot traceability.
How does the thermal resistance of the 3KASMC26HE3/57T affect PCB layout?
The 3KASMC26HE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout. To maintain safe junction temperatures under sustained power dissipation, designers must follow Vishay's specified mounting pad dimensions (0.126" × 0.185") and avoid excessive copper isolation. The 3KASMC26HE3/57T benefits from thermal relief to adjacent ground planes but does not require external heatsinking for transient-only operation.
Can the 3KASMC26HE3/57T replace older SMCJ26A devices in existing designs?
The 3KASMC26HE3/57T shares the same DO-214AB (SMC) package and identical electrical ratings (VWM = 26 V, VC = 42.1 V, PPPM = 3000 W) as SMCJ26A, but adds AEC-Q101 qualification and extended TJ max = 185 °C. It is a drop-in replacement for SMCJ26A in new designs targeting automotive qualification. However, legacy SMCJ26A designs must verify board-level reflow profile compatibility and update documentation to reflect the enhanced reliability of the 3KASMC26HE3/57T.
3KASMC26HE3/57T 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)
3KASMC26HE3/57T FAQ
1.How can I place an order for 3KASMC26HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC26HE3/57T 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 3KASMC26HE3/57T reliable?
The price and inventory of 3KASMC26HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC26HE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC26HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC26HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC26HE3/57T?
3KASMC26HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC26HE3/57T 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 3KASMC26HE3/57T?
For technical support, including 3KASMC26HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC26HE3/57T requirements.
6.How does Aetrix verify that 3KASMC26HE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC26HE3/57T 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 3KASMC26HE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC26HE3/57T?
All 3KASMC26HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC26HE3/57T, 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 3KASMC26HE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC26HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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