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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3/9AT
- Part No.:
- 3KASMC18AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
3KASMC18AHE3/9AT 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 29.2 V under 103 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and motor drives.
For engineers reviewing the 3KASMC18AHE3/9AT datasheet, 3KASMC18AHE3/9AT pinout, 3KASMC18AHE3/9AT application, or 3KASMC18AHE3/9AT equivalent, this page provides verified electrical parameters, DO-214AB (SMC) package details, AEC-Q101 qualification status, thermal resistance data, and real-world use cases in automotive electronics protection circuits.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity and 18 V stand-off voltage (VWM) make it suitable for DC bus line protection where reverse conduction must be blocked during normal operation.
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and achieves 185 °C maximum junction temperature - supporting under-hood automotive applications without derating penalties up to ambient temperatures of 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - defines maximum continuous reverse operating voltage before clamping begins; sets threshold for protection activation in 24 V automotive systems. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - ensures reliable avalanche initiation within tight tolerance for predictable clamping onset. |
| VC (Clamping Voltage) | 29.2 V at 103 A (10/1000 µs) - limits transient voltage seen by downstream components to safe levels during high-energy surges. |
| PPPM (Peak Pulse Power) | 3000 W - enables suppression of severe load-dump and ISO 7637-2 Pulse 5a transients without failure. |
| TJ max. | 185 °C - supports operation in high-temperature environments such as engine compartments without thermal shutdown. |
| RθJA | 77.5 °C/W - indicates thermal performance on standard PCB pad layout; informs heatsinking requirements for sustained surge duty cycles. |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, UL 94 V-0 molding compound. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or surge clamping | Connected to protected circuit ground or low-side return path; forms clamping loop with cathode. |
| Cathode | Current exit terminal during avalanche breakdown | Connected to protected line (e.g., 24 V rail); voltage clamping occurs between cathode and anode when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design improves long-term reliability under thermal cycling and humidity exposure. |
| High-temperature capability | Rated for continuous operation up to TJ = 185 °C - eliminates need for derating in under-hood automotive modules. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response time), enhancing protection margin for sensitive gate drivers. |
| MSL Level 1 rating | Compatible with standard lead-free reflow profiles (peak 260 °C), eliminating moisture sensitivity handling requirements. |
| AEC-Q101 qualification | Validated for automotive use via stress tests including HTGB, H3TRB, and ESD-HBM ≥ 8 kV - reduces qualification burden for Tier 1 suppliers. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive DC Bus |
|---|---|
Use Scenario: Protection of microcontroller I/O and power supply inputs against load dump and alternator ripple in 24 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across battery input rail to clamp transients exceeding 18 V stand-off level. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies and CAN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Surge suppression on the DC link between rectifier and inverter stage in variable-frequency drives. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between +DC and GND to absorb regenerative energy spikes during rapid deceleration. Use Value: Limits voltage overshoot to ≤29.2 V at 103 A, protecting IGBT gate drivers and bus capacitors from overvoltage stress. |
| Telecom Power Supply Input | Consumer Appliance Main Board |
Use Scenario: Input-stage protection for AC/DC adapters subjected to lightning-induced surges on primary-side rectified outputs. IC Role / Device Role / Timing Role: Unidirectional TVS mounted after bridge rectifier to clamp positive-going transients on bulk capacitor node. Use Value: Withstands 3000 W pulses while maintaining low leakage (<1 µA at 18 V), preserving standby power efficiency. |
Use Scenario: Protection of MCU reset lines and sensor interfaces in washing machine control boards exposed to relay coil kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point to shunt inductive spikes before reaching digital ICs. Use Value: Fast response and stable clamping ensure no false resets or communication errors during repeated solenoid actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T (Vishay) | Same DO-214AC (SMA) package; lower PPPM (400 W); VWM = 18 V; VC = 29.2 V at 13.7 A | Not rated for 185 °C; not AEC-Q101 qualified; suited for consumer-grade board-level protection only | Select when cost-sensitive non-automotive designs require basic 18 V clamping with smaller footprint. |
| 1.5KE18A (ON Semiconductor) | Through-hole DO-201 package; same VWM/VC specs; PPPM = 1500 W; TJ max. = 175 °C; AEC-Q101 not claimed | Larger board area; incompatible with SMT assembly; limited to legacy or high-surge but non-automotive systems | Choose only if existing through-hole infrastructure prohibits SMT adoption and 1500 W surge rating suffices. |
Compared with SMAJ18A-E3/57T and 1.5KE18A, the 3KASMC18AHE3/9AT offers triple the peak pulse power, full AEC-Q101 compliance, and extended 185 °C operation - making it the sole choice for new automotive power rail designs requiring zero derating at elevated ambient temperatures.
Availability
3KASMC18AHE3/9AT is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drive DC buses, and telecom power supply inputs requiring stable component supply across multi-year production programs.
Supply support for 3KASMC18AHE3/9AT 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 and automotive-grade performance.
The 3KASMC series belongs to Vishay's PAR® family of high-power surface-mount TVS diodes, engineered specifically for AEC-Q101-compliant transient suppression in harsh-temperature automotive and industrial environments.
FAQ
What is the clamping voltage of the 3KASMC18AHE3/9AT under maximum surge conditions?
The 3KASMC18AHE3/9AT exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 µs waveform with peak current IPPM = 103 A. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components remain within safe operating voltage limits during worst-case transients.
Is the 3KASMC18AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC18AHE3/9AT is fully AEC-Q101 qualified and rated for operation up to TJ = 185 °C. It has passed all required stress tests including high-temperature reverse bias, temperature cycling, and ESD-HBM ≥ 8 kV - confirming suitability for under-hood automotive modules such as ECUs and body control units.
What package type does the 3KASMC18AHE3/9AT use, and what are its key mechanical features?
The 3KASMC18AHE3/9AT uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads solderable per J-STD-002. Its molding compound meets UL 94 V-0 flammability rating, and it complies with MSL Level 1 for lead-free reflow up to 260 °C peak temperature.
How does the 3KASMC18AHE3/9AT compare to standard SMAJ-series TVS diodes in surge handling capability?
The 3KASMC18AHE3/9AT delivers 3000 W peak pulse power - 7.5× higher than the 400 W rating of SMAJ18A-E3/57T. This enables protection against severe ISO 7637-2 Pulse 5a load-dump events that would otherwise exceed the energy-handling limit of smaller packages like DO-214AC.
What is the maximum reverse leakage current of the 3KASMC18AHE3/9AT at its stand-off voltage?
At VWM = 18 V and TA = 25 °C, the 3KASMC18AHE3/9AT specifies a maximum reverse leakage current (IR) of 1.0 µA. At elevated temperature (TJ = 150 °C), IR remains ≤10 µA - ensuring minimal power loss and no impact on system standby current budgets.
3KASMC18AHE3/9AT 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 103A
- 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)
3KASMC18AHE3/9AT FAQ
1.How can I place an order for 3KASMC18AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3/9AT 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 3KASMC18AHE3/9AT reliable?
The price and inventory of 3KASMC18AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3/9AT?
3KASMC18AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3/9AT 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 3KASMC18AHE3/9AT?
For technical support, including 3KASMC18AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC18AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3/9AT 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 3KASMC18AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3/9AT?
All 3KASMC18AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3/9AT, 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 3KASMC18AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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