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Vishay General Semiconductor - Diodes Division 3KASMC18HE3_A/H
- Part No.:
- 3KASMC18HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18HE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,227
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Product details
Overview
3KASMC18HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection 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 3KASMC18HE3_A/H datasheet, 3KASMC18HE3_A/H pinout, 3KASMC18HE3_A/H application, or 3KASMC18HE3_A/H equivalent, key selection criteria include its 18 V stand-off voltage, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and verified clamping behavior under repetitive surge stress at elevated ambient temperatures.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides forward conduction during overvoltage events while maintaining tight 20.0–22.1 V breakdown tolerance at 1 mA test current.
Rated for 200 A non-repetitive forward surge (8.3 ms half-sine), it achieves 29.2 V clamping at 103 A with 77.5 °C/W junction-to-ambient thermal resistance on standard PCB pads - supporting reliable operation in compact, thermally constrained layouts without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for 24 V automotive systems. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across production lots and temperature extremes. |
| PPPM | 3000 W (10/1000 µs) - Sustains high-energy transients from load dump or inductive kick without failure. |
| VC @ IPPM | 29.2 V at 103 A - Clamping voltage limits downstream device stress during worst-case surge events. |
| TJ max | 185 °C - Enables deployment in under-hood automotive environments and high-power industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.06 mm lead spacing. |
Pinout & Package
DO-214AB (SMC) package with cathode indicated by molded band; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side return path; enables clamping when voltage exceeds VBR. |
| Cathode | Current exit point during forward conduction | Connected to protected line (e.g., 12 V/24 V rail); polarity marking ensures correct orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift and improves long-term stability at 150 °C. |
| MSL Level 1 | Reflow-compatible up to 260 °C peak without popcorn effect or delamination - eliminates pre-bake requirements. |
| Low Rsurge | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), critical for protecting sensitive gate drivers. |
| RoHS & Halogen-Free | Complies with JEDEC JS709A and EU Directive 2011/65/EU - supports environmental compliance in global OEM BOMs. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protection of microcontroller I/O and power supply inputs against load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary clamping element on 12 V/24 V battery rail upstream of DC-DC converters and LDOs. Use Value: Withstands 3000 W surges while limiting clamped voltage to ≤29.2 V - preserving MCU reset thresholds and analog sensor accuracy. |
Use Scenario: Safeguarding gate drivers and bootstrap circuits from inductive flyback during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role: Unidirectional TVS placed across DC bus or gate-source terminals to absorb commutation energy. Use Value: 185 °C rating allows placement near heat-generating power modules without derating; 103 A surge capacity matches typical drive fault currents. |
| Telecom Base Station Power Supply | Consumer Appliance Main Board |
Use Scenario: Mitigating lightning-induced surges on AC/DC front-end rectifiers and PFC stage outputs. IC Role / Device Role: Secondary surge suppression after MOVs, providing precise clamping where fast response and low capacitance are required. Use Value: 29.2 V clamping voltage aligns with 24 V nominal telecom distribution rails; DO-214AB footprint enables high-density layout. |
Use Scenario: Protecting microcontroller reset lines and communication interfaces (UART, I²C) from ESD and relay coil kickback. IC Role / Device Role: Localized TVS on board-level power domains and signal paths subject to user-accessible connectors. Use Value: AEC-Q101 qualification ensures consistent performance across manufacturing batches and extended product lifecycles (>10 years). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower PPPM (400 W), same DO-214AC (SMA) package; 20.0–22.2 V VBR, 29.2 V VC @ 13.7 A | Not rated for AEC-Q101; limited to consumer/industrial use below 150 °C junction | Select when cost sensitivity outweighs automotive qualification and surge energy requirements. |
| SMCJ18A | Same 3000 W PPPM and DO-214AB (SMC) package; identical VWM/VBR/VC specs but rated to 175 °C only | Lacks AEC-Q101 validation; not approved for automotive safety-critical subsystems | Choose for non-automotive industrial applications requiring same surge handling but lower temperature ceiling. |
Compared with SMAJ18A and SMCJ18A, the 3KASMC18HE3_A/H uniquely combines AEC-Q101 qualification, 185 °C operation, and full 3000 W surge capability in DO-214AB - making it the only option qualified for under-hood automotive electronics where both reliability and energy handling are mandatory.
Availability
3KASMC18HE3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom base station power supplies, and consumer appliance main boards requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC18HE3_A/H 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, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive power systems - emphasizing thermal resilience, surge repeatability, and zero-defect manufacturing.
FAQ
What is the maximum clamping voltage of the 3KASMC18HE3_A/H under surge conditions?
The 3KASMC18HE3_A/H exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated 103 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed across production lots - ensuring consistent overvoltage limiting for downstream components like microcontrollers and gate drivers in the 3KASMC18HE3_A/H application space.
Is the 3KASMC18HE3_A/H suitable for automotive applications?
Yes, the 3KASMC18HE3_A/H is AEC-Q101 qualified and rated for continuous operation up to 185 °C junction temperature - meeting stringent reliability requirements for under-hood automotive systems including engine control units and body electronics. Its DO-214AB package, MSL Level 1 reflow compatibility, and passivated junction structure make the 3KASMC18HE3_A/H appropriate for automotive production environments.
What does the "_A/H" suffix indicate in 3KASMC18HE3_A/H?
The "_A/H" suffix in 3KASMC18HE3_A/H denotes the packaging configuration: "H" specifies 7-inch plastic tape-and-reel delivery with 850 units per reel, while "A" indicates the base P/NHM3 variant - RoHS-compliant, AEC-Q101 qualified, and meeting JESD201 Class 2 whisker resistance. This distinguishes the 3KASMC18HE3_A/H from alternate reels (e.g., "_A/I" = 13-inch reel) and non-qualified variants.
How does the thermal performance of the 3KASMC18HE3_A/H compare to similar TVS diodes?
The 3KASMC18HE3_A/H features a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W on standard PCB pads - significantly lower than SMA-package alternatives (e.g., ~120 °C/W). This enables higher sustained power dissipation and improved surge repetition capability. When mounted per Vishay's recommended pad layout, the 3KASMC18HE3_A/H maintains stable clamping performance even at 150 °C ambient - a key advantage over standard SMCJ devices.
Can the 3KASMC18HE3_A/H replace older 3KASMC18A variants?
Yes, the 3KASMC18HE3_A/H is a direct replacement for legacy 3KASMC18A parts with identical electrical specifications, DO-214AB mechanical outline, and AEC-Q101 qualification. The "E3" prefix confirms Vishay's enhanced manufacturing process, while "_A/H" specifies the tape-and-reel packaging. No PCB layout or schematic changes are needed when upgrading to the 3KASMC18HE3_A/H in existing designs.
3KASMC18HE3_A/H 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:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 93.2A
- 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)
3KASMC18HE3_A/H FAQ
1.How can I place an order for 3KASMC18HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18HE3_A/H 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 3KASMC18HE3_A/H reliable?
The price and inventory of 3KASMC18HE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC18HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18HE3_A/H?
3KASMC18HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18HE3_A/H 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 3KASMC18HE3_A/H?
For technical support, including 3KASMC18HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC18HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC18HE3_A/H 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 3KASMC18HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC18HE3_A/H?
All 3KASMC18HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18HE3_A/H, 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 3KASMC18HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC18HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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