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Vishay General Semiconductor - Diodes Division SMC5K18AHM3_A/H
- Part No.:
- SMC5K18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K18AHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,843
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Product details
Overview
SMC5K18AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 5000 W peak pulse power (10/1000 μs), 20.0–22.1 V breakdown voltage (VBR), and clamps to ≤29.2 V at 171 A peak pulse current - deployed in automotive ECUs, industrial motor drives, and telecom power supplies.
For engineers reviewing the SMC5K18AHM3_A/H datasheet, SMC5K18AHM3_A/H pinout, SMC5K18AHM3_A/H application, or SMC5K18AHM3_A/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RthJA = 90 °C/W), clamping performance under 8/20 μs surges, and direct replacement guidance for industrial and automotive-grade TVS selection.
Technical Context
This device operates as a unidirectional avalanche diode with fast response time (<1 ns) and low incremental surge resistance, enabling effective clamping of inductive switching transients and lightning-induced surges. Its junction-to-ambient thermal resistance of 90 °C/W supports reliable operation up to +150 °C junction temperature under pulsed conditions.
The SMC5K18AHM3_A/H meets IEC 61000-4-2 ESD immunity (30 kV contact/air), UL 497B recognition (E136766), and J-STD-020 MSL Level 1 reflow compatibility (260 °C peak). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - limited to SMC5K10A–SMC5K20A family members per Vishay documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA test current - defines minimum voltage at which avalanche conduction begins; ensures robust turn-on margin above 18 V stand-off. |
| VWM | 18 V - maximum continuous reverse operating voltage; sets safe DC bias limit before leakage rises significantly. |
| VC @ IPPM (10/1000 μs) | ≤29.2 V at 171 A - clamping voltage during standard surge event; determines protected circuit's maximum transient overvoltage exposure. |
| PPPM | 5000 W - peak pulse power handling capability; enables suppression of high-energy transients without failure. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| RthJA | 90 °C/W - thermal resistance from junction to ambient on FR4 PCB; informs heatsinking requirements for repetitive surge duty cycles. |
| ESD Rating | 30 kV HBM (contact & air) - exceeds IEC 61000-4-2 Level 4; protects against electrostatic discharge during handling and system operation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating. Cathode indicated by color band; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse-biased surge events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail or signal trace); absorbs transient energy into ground via avalanche breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in engine control, ADAS, and body electronics without additional qualification. |
| 5000 W peak pulse power (10/1000 μs) | Supports EN 61000-4-5 Level 4 (4 kV line-earth) and ISO 7637-2 Pulse 1/2a/5a compliance in compact SMC footprint. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs like microcontrollers and CAN transceivers during surge events. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and JESD201 Class 2 whisker resistance - suitable for lead-free reflow assembly. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking - reduces manufacturing complexity. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 30 V. Use Value: Clamps to ≤29.2 V at 171 A, preventing damage to 3.3 V/5 V logic supplies and CAN/LIN transceivers downstream. |
Use Scenario: Safeguarding gate drivers and feedback sensors in variable-frequency AC drives. IC Role / Device Role / Timing Role: Surge suppression on isolated DC bus monitoring lines and PWM gate drive return paths. Use Value: Fast <1 ns response and low Rsurge ensure minimal overshoot during IGBT switching transients. |
| Telecom Power Supply Input | Consumer Sensor Interface Protection |
|
Use Scenario: Front-end protection of 48 V PoE-powered base stations and remote radio units. IC Role / Device Role / Timing Role: Primary surge limiter on secondary-side DC output rails prior to DC/DC converters. Use Value: 5000 W rating handles repeated lightning-induced surges per IEC 61000-4-5; UL 497B recognition supports safety certification. |
Use Scenario: Shielding I²C/SPI lines connecting MEMS sensors to host MCUs in smart home devices. IC Role / Device Role / Timing Role: Low-capacitance (typ. 200 pF at 0 V) unidirectional clamp on bidirectional data lines. Use Value: Maintains signal integrity while suppressing ESD events up to 30 kV - critical for touch-sensitive and battery-powered systems. |
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-M3/86A | Lower PPPM (400 W), SMA package (smaller footprint, higher RthJA = 150 °C/W), same VWM/VBR range. | Not AEC-Q101 qualified; limited to consumer/industrial grade where automotive reliability not required. | Select when board space is constrained and surge energy is ≤400 W; verify thermal derating at elevated ambient temperatures. |
| SMCJ18A-HM3 | Same SMC package and AEC-Q101 qualification, but rated for 1500 W PPPM; lower clamping voltage (27.7 V @ 100 A). | Better suited for lower-energy transients where tighter clamping is prioritized over extreme surge handling. | Choose when system-level testing shows 1500 W suffices and lower VC improves margin for 3.3 V logic interfaces. |
Compared with SMC5K18AHM3_A/H, SMAJ18A-M3/86A offers smaller size but sacrifices surge capacity and automotive qualification, while SMCJ18A-HM3 trades peak power for tighter clamping and reduced thermal stress - both require validation against actual surge profiles and layout parasitics.
Availability
SMC5K18AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, telecom power supplies, and consumer sensor modules requiring stable component supply across multi-year production cycles.
Supply support for SMC5K18AHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, power handling, and automotive-grade qualification.
The SMC5K18AHM3_A/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust transient suppression in harsh environments such as automotive under-hood and industrial factory-floor applications.
FAQ
What is the breakdown voltage range of the SMC5K18AHM3_A/H?
The SMC5K18AHM3_A/H has a specified breakdown voltage (VBR) range of 20.0 V to 22.1 V at 1.0 mA test current, per Vishay Document Number 87742. This ensures consistent avalanche initiation above its 18 V stand-off voltage and provides design margin against tolerance drift across temperature and lifetime. The SMC5K18AHM3_A/H maintains this specification under JEDEC-standard test conditions and is validated across the full -55 °C to +150 °C operating junction range.
Is the SMC5K18AHM3_A/H qualified for automotive applications?
Yes, the SMC5K18AHM3_A/H carries the HM3 suffix, confirming it is AEC-Q101 qualified per Vishay's published specifications for the SMC5K10A–SMC5K20A series. This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, making the SMC5K18AHM3_A/H suitable for automotive powertrain, body, and infotainment systems where reliability under thermal and mechanical stress is mandatory.
What is the maximum clamping voltage of the SMC5K18AHM3_A/H under a 10/1000 μs surge?
The SMC5K18AHM3_A/H clamps to a maximum of 29.2 V at 171 A peak pulse current under the standard 10/1000 μs waveform, as specified in the Electrical Characteristics table of Vishay Document 87742. This value is measured at TA = 25 °C and represents worst-case conduction voltage during high-energy transients - critical for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings.
Does the SMC5K18AHM3_A/H meet UL safety certification?
Yes, the SMC5K18AHM3_A/H is UL recognized under file E136766 to UL 497B for transient voltage surge suppressors. This certification validates its safety performance in end-equipment applications including telecom infrastructure, industrial controls, and automotive subsystems - supporting regulatory compliance for CE, FCC, and other regional safety marks when used per manufacturer-recommended layout and derating guidelines.
What packaging and moisture sensitivity level does the SMC5K18AHM3_A/H have?
The SMC5K18AHM3_A/H is supplied in 7-inch plastic tape and reel (package code H), with 850 units per reel. It meets J-STD-020 Moisture Sensitivity Level (MSL) 1, permitting unlimited floor life and standard lead-free reflow profiles with peak temperature up to 260 °C - eliminating pre-bake requirements and simplifying SMT assembly for high-volume manufacturing of the SMC5K18AHM3_A/H.
SMC5K18AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 171.2A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC5K18AHM3_A/H FAQ
1.How can I place an order for SMC5K18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K18AHM3_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 SMC5K18AHM3_A/H reliable?
The price and inventory of SMC5K18AHM3_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 SMC5K18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC5K18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K18AHM3_A/H?
SMC5K18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K18AHM3_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 SMC5K18AHM3_A/H?
For technical support, including SMC5K18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K18AHM3_A/H requirements.
6.How does Aetrix verify that SMC5K18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC5K18AHM3_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 SMC5K18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC5K18AHM3_A/H?
All SMC5K18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K18AHM3_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 SMC5K18AHM3_A/H part is unused and in its original packaging.
Return procedure for SMC5K18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K18AHM3_A/H Tags
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