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Vishay General Semiconductor - Diodes Division 3KASMC26AHE3/9AT
- Part No.:
- 3KASMC26AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC26AHE3/9AT.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,024
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Product details
Overview
3KASMC26AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 42.1 V under 71.3 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients.
For engineers reviewing the 3KASMC26AHE3/9AT datasheet, 3KASMC26AHE3/9AT pinout, 3KASMC26AHE3/9AT application, or 3KASMC26AHE3/9AT equivalent, this device is selected for high-reliability DC bus protection where AEC-Q101 qualification, MSL Level 1 solderability, and stable clamping performance across -65 °C to +185 °C are mandatory design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low incremental surge resistance and excellent clamping linearity under high-current transients. Its unidirectional polarity and DO-214AB (SMC) package support direct integration into 12 V–24 V automotive power distribution networks and industrial motor drive DC links.
The device meets AEC-Q101 stress test requirements and is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 77.5 °C/W (junction-to-ambient) and 18.3 °C/W (junction-to-leads), enabling effective heat dissipation on standard PCB pad layouts without additional heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage; defines safe DC bus voltage ceiling before leakage rises. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Breakdown threshold range; ensures reliable triggering above nominal system voltage. |
| VC @ IPPM | 42.1 V at 71.3 A - Clamping voltage under full 3000 W surge; determines maximum stress imposed on protected downstream devices. |
| PPPM | 3000 W (10/1000 μs waveform) - Peak transient energy handling capacity; supports ISO 7637-2 Pulse 1/2a/5a compliance testing. |
| TJ max. | +185 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures without derating. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11 mm × 6.22 mm footprint and matte tin-plated leads compliant with J-STD-002. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band on one end; two-terminal device with anode and cathode leads extending from opposite sides of molded body. Mounting pad layout per Vishay specification: 3.20 mm minimum width, 1.52 mm minimum spacing, 4.69 mm maximum length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or surge clamping | Connected to lower-potential side of protected circuit (e.g., ground or return path); forms clamping loop with cathode. |
| Cathode | Current exit point during reverse-biased clamping | Connected to higher-potential rail (e.g., battery+, VIN); conducts surge current to ground when VRM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing - required for engine control, ADAS, and body electronics. |
| Junction passivation | Optimized anisotropic rectifier structure reduces parameter drift over temperature and lifetime, ensuring stable VBR and VC across 185 °C operation. |
| MSL Level 1 rating | Rated for reflow peak temperatures up to 260 °C - compatible with standard lead-free SMT assembly without moisture sensitivity concerns. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump), improving protection margin for sensitive gate drivers and microcontrollers. |
Applications
| Automotive Power Distribution | Industrial Motor Drive DC Link |
|---|---|
Use Scenario: Protection of 24 V battery-fed ECUs against load dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between battery rail and input filter capacitor. Use Value: Limits transient voltage to ≤42.1 V during 3000 W surges, preventing damage to 36 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Surge suppression on DC bus of variable-frequency drives powering HVAC compressors or pumps. IC Role / Device Role / Timing Role: High-power transient shunt connected across main DC link capacitors. Use Value: Absorbs inductive kickback energy from contactor switching, maintaining bus voltage stability and avoiding overvoltage trips. |
| Telecom Power Supply Input | Consumer Appliance Control Board |
Use Scenario: Input-stage protection of AC/DC front-ends in base station power modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side 48 V output rail. Use Value: Withstands repeated 10/1000 μs transients up to 71.3 A while maintaining <1 μA leakage at 26 V - preserving standby efficiency. |
Use Scenario: Protection of MCU I/O and relay driver circuits in smart washing machines subject to pump motor commutation noise. IC Role / Device Role / Timing Role: Localized clamping diode adjacent to power FET gates and sensor inputs. Use Value: Fast response time and low clamping voltage prevent false resets and latch-up in 3.3 V/5 V logic domains during ESD events. |
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-E3/57T (Vishay) | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range but higher VC (42.8 V) | Suitable for space-constrained consumer designs; insufficient for automotive load dump where 3000 W capability is mandated. | Select 3KASMC26AHE3/9AT when 3000 W surge rating and AEC-Q101 qualification are required; choose SMAJ26A-E3/57T only for cost-sensitive, low-energy applications. |
| 1.5KE27A (ON Semiconductor) | Through-hole TO-218 package, 1500 W PPPM, higher VC (45.7 V), no AEC-Q101 qualification | Legacy industrial designs with existing through-hole layouts; not suitable for new automotive or high-density SMT platforms. | 3KASMC26AHE3/9AT offers superior power density, surface-mount compatibility, and automotive qualification - use only if board redesign and qualification are feasible. |
Compared with SMAJ26A-E3/57T and 1.5KE27A, the 3KASMC26AHE3/9AT provides triple the peak pulse power in a qualified SMT package, enabling single-device compliance with stringent automotive surge standards while reducing PCB area and eliminating through-hole assembly steps.
Availability
3KASMC26AHE3/9AT is available at Aetrix Electronics and suitable for automotive power management, industrial motor control, telecom power supply input protection, and consumer appliance surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC26AHE3/9AT 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 diodes, rectifiers, MOSFETs, and TVS devices with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient protection in harsh-environment automotive and industrial systems, prioritizing thermal stability, surge robustness, and process-controlled parametric consistency.
FAQ
What is the clamping voltage of the 3KASMC26AHE3/9AT under maximum surge conditions?
The 3KASMC26AHE3/9AT exhibits a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 71.3 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The 3KASMC26AHE3/9AT maintains this clamping performance across its full operating temperature range up to +185 °C.
Is the 3KASMC26AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC26AHE3/9AT is AEC-Q101 qualified, having passed all stress tests including high-temperature operating life, temperature cycling, unbiased highly accelerated stress test, and electrostatic discharge. Its 185 °C maximum junction temperature and MSL Level 1 rating make it suitable for engine compartment, transmission control, and ADAS module designs where reliability under thermal and mechanical stress is critical. The 3KASMC26AHE3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What package does the 3KASMC26AHE3/9AT use, and what are its key mounting requirements?
The 3KASMC26AHE3/9AT uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability standards. Recommended mounting pad layout specifies a minimum width of 3.20 mm, minimum spacing of 1.52 mm, and maximum length of 4.69 mm. The device is rated for reflow peak temperatures up to 260 °C (MSL Level 1), supporting standard lead-free SMT processes without pre-baking.
How does the 3KASMC26AHE3/9AT compare to the SMAJ26A in terms of surge handling capability?
The 3KASMC26AHE3/9AT delivers 3000 W peak pulse power (10/1000 μs), whereas the SMAJ26A is rated for only 400 W - a 7.5× difference. Both share the same 26 V stand-off voltage, but the 3KASMC26AHE3/9AT achieves lower incremental surge resistance and tighter VBR tolerance (28.9–31.9 V vs. 28.9–32.0 V), resulting in more consistent clamping behavior. The 3KASMC26AHE3/9AT is also AEC-Q101 qualified; the SMAJ26A is not.
What is the maximum reverse leakage current of the 3KASMC26AHE3/9AT at its rated stand-off voltage?
At VWM = 26 V and TA = 25 °C, the 3KASMC26AHE3/9AT has a maximum reverse leakage current (IR) of 1.0 μA. At elevated temperature (TJ = 150 °C), leakage increases to a maximum of 10 μA - still well within acceptable limits for low-power monitoring circuits and high-impedance sensor interfaces. This low leakage preserves system efficiency in always-on automotive modules.
3KASMC26AHE3/9AT 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:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 71.3A
- 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)
3KASMC26AHE3/9AT FAQ
1.How can I place an order for 3KASMC26AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC26AHE3/9AT 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 3KASMC26AHE3/9AT reliable?
The price and inventory of 3KASMC26AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC26AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC26AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC26AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC26AHE3/9AT?
3KASMC26AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC26AHE3/9AT 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 3KASMC26AHE3/9AT?
For technical support, including 3KASMC26AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC26AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC26AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC26AHE3/9AT 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 3KASMC26AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC26AHE3/9AT?
All 3KASMC26AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC26AHE3/9AT, 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 3KASMC26AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC26AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC26AHE3/9AT Tags
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