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Vishay General Semiconductor - Diodes Division 3KASMC18AHM3_A/H
- Part No.:
- 3KASMC18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
3KASMC18AHM3_A/H 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, 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 3KASMC18AHM3_A/H datasheet, 3KASMC18AHM3_A/H pinout, 3KASMC18AHM3_A/H application, or 3KASMC18AHM3_A/H equivalent, key selection criteria include its DO-214AB (SMC) package, 18 V stand-off voltage, AEC-Q101 qualification, 1.0 mA breakdown test current, and 1.0 μA max reverse leakage at VWM.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range. Its low incremental surge resistance and fast response time ensure effective suppression of ESD and lightning-induced transients on 12 V and 24 V DC systems.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 77.5 °C/W junction-to-ambient thermal resistance when mounted on minimum recommended pads - supporting reliable operation without active cooling in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 12 V nominal systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - Ensures consistent breakdown threshold with tight 10.5% tolerance for predictable protection onset. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy surges typical of ISO 7637-2 Pulse 5a/b without degradation. |
| VC @ IPPM | ≤29.2 V at 103 A - Limits voltage seen by downstream components during worst-case transient events. |
| TJ max | +185 °C - Enables placement near hot components (e.g., power MOSFETs, ignition coils) without derating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components including temperature cycling and HTRB. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11 mm × 6.60 mm footprint and 3.20 mm height. |
Pinout & Package
Package: DO-214AB (SMC), molded in UL 94 V-0 compliant compound; matte tin-plated leads; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; forms clamping path during reverse overvoltage. |
| Cathode | High-side connection point | Connected to protected line (e.g., battery rail); reverse-biased during normal operation; conducts during surge. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<1.0 μA at VWM) and long-term reliability under thermal cycling. |
| 185 °C junction rating | Supports direct mounting on high-temperature PCB zones in under-hood automotive applications without thermal derating. |
| 3000 W peak pulse power | Withstands severe load-dump transients per ISO 16750-2 and SAE J1113-11 without failure. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required pre-assembly. |
| Uni-directional polarity only | Simplifies layout and eliminates risk of reverse-bias damage in DC power rail protection configurations. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting microcontroller I/O and gate drivers from inductive kickback during solenoid and fuel injector switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12 V supply rail and ground. Use Value: Limits transient voltage to ≤29.2 V, preventing latch-up or permanent damage to 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding IGBT gate drivers and bus voltage sense circuits against switching noise and regeneration spikes. IC Role / Device Role / Timing Role: Primary surge suppressor on DC link input, parallel to bulk capacitor. Use Value: Absorbs 3000 W pulses without degradation, maintaining system uptime in variable-frequency drive environments. |
| Telecom Power Supply Input | Automotive Body Control Module (BCM) |
Use Scenario: Suppressing lightning-induced surges on 48 V telecom rectifier outputs feeding base station equipment. IC Role / Device Role / Timing Role: First-line transient protection on secondary-side DC output before DC/DC converters. Use Value: Clamps within nanoseconds to protect downstream POL regulators and FPGA power rails. |
Use Scenario: Shielding LIN bus transceivers and LED driver ICs from battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional placement simplifies BOM and layout. Use Value: AEC-Q101 qualification ensures compliance with automotive OEM reliability standards for interior electronics. |
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 | Lower PPPM (400 W), same VWM/VBR, DO-214AC (SMA) package | Not AEC-Q101 qualified; limited to consumer/industrial use | Select when cost sensitivity outweighs automotive qualification and surge energy requirements. |
| SMCJ18A | Same PPPM (3000 W), identical VWM/VBR, DO-214AB (SMC) package, AEC-Q101 qualified | Higher VC (32.4 V) and lower IPPM (92.6 A) than 3KASMC18AHM3_A/H | Choose if tighter clamping voltage (≤29.2 V) is critical for protecting low-voltage logic in proximity to protected rail. |
Compared with SMAJ18A and SMCJ18A, the 3KASMC18AHM3_A/H offers superior clamping voltage (≤29.2 V), higher surge current capability (103 A), and optimized thermal stability up to 185 °C - making it preferred for high-reliability automotive power rail protection where voltage margin and junction temperature headroom are constrained.
Availability
3KASMC18AHM3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power supplies, and body control modules requiring stable component supply and full AEC-Q101 compliance.
Supply support for 3KASMC18AHM3_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 belongs to Vishay's PAR® family of high-power TVS diodes engineered specifically for harsh-environment transient suppression - emphasizing AEC-Q101 qualification, extended temperature operation, and repeatable clamping performance under surge stress.
FAQ
What is the maximum clamping voltage of the 3KASMC18AHM3_A/H under peak surge conditions?
The 3KASMC18AHM3_A/H has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 103 A (10/1000 μs waveform). This value is guaranteed per the Vishay datasheet and reflects worst-case clamping performance at TA = 25 °C - critical for ensuring downstream ICs remain within absolute maximum ratings during surge events.
Is the 3KASMC18AHM3_A/H suitable for automotive applications?
Yes, the 3KASMC18AHM3_A/H is AEC-Q101 qualified and rated for operation up to +185 °C junction temperature, making it fully suitable for under-hood automotive applications such as engine control units, transmission control modules, and body control modules. Its DO-214AB package and MSL Level 1 rating also support automated lead-free assembly in automotive manufacturing lines.
What does the "HM3_A/H" suffix indicate in 3KASMC18AHM3_A/H?
The "HM3" denotes Vishay's RoHS-compliant, AEC-Q101-qualified base package (DO-214AB), while "_A/H" specifies the packaging configuration: "A" indicates revision level A, and "H" denotes 7-inch plastic tape-and-reel delivery with 850 units per reel. This ordering code aligns with Vishay's standard delivery mode for high-volume automotive procurement.
How does the 3KASMC18AHM3_A/H compare to standard SMAJ-series TVS diodes?
The 3KASMC18AHM3_A/H delivers 3000 W peak pulse power - 7.5× higher than the 400 W rating of SMAJ18A - and features AEC-Q101 qualification and 185 °C junction capability, unlike SMAJ18A. Its DO-214AB (SMC) package also provides lower thermal resistance than DO-214AC (SMA), enabling better power dissipation in thermally dense layouts.
What is the reverse leakage current specification for the 3KASMC18AHM3_A/H at its stand-off voltage?
The 3KASMC18AHM3_A/H has a maximum reverse leakage current (IR) of 1.0 μA at its 18 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated temperatures (TJ = 150 °C), leakage remains ≤50 μA - ensuring minimal standby power loss and stable biasing in always-on automotive modules.
3KASMC18AHM3_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:
- 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)
3KASMC18AHM3_A/H FAQ
1.How can I place an order for 3KASMC18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHM3_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 3KASMC18AHM3_A/H reliable?
The price and inventory of 3KASMC18AHM3_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 3KASMC18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHM3_A/H?
3KASMC18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHM3_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 3KASMC18AHM3_A/H?
For technical support, including 3KASMC18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHM3_A/H requirements.
6.How does Aetrix verify that 3KASMC18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHM3_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 3KASMC18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHM3_A/H?
All 3KASMC18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHM3_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 3KASMC18AHM3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18AHM3_A/H Tags
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