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Vishay General Semiconductor - Diodes Division SMCJ18AHM3/H
- Part No.:
- SMCJ18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHM3/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,300
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Product details
Overview
SMCJ18AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, with 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1 mA), 29.2 V clamping voltage (VC) at 51.4 A peak pulse current, and 1500 W peak pulse power rating for 10/1000 µs waveform. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in automotive and industrial power rails.
For engineers reviewing the SMCJ18AHM3/H datasheet, SMCJ18AHM3/H pinout, SMCJ18AHM3/H application, or SMCJ18AHM3/H equivalent, this device delivers AEC-Q101 qualified surge protection with halogen-free RoHS compliance, low incremental surge resistance, and fast response time - critical for robust ESD and EOS hardening in 12 V/24 V DC systems.
Technical Context
The SMCJ18AHM3/H operates as a unidirectional avalanche diode, clamping reverse transients above its VWM = 18 V while maintaining <1.0 µA leakage at rated standoff. Its glass-passivated junction ensures stable breakdown and low capacitance (<100 pF at 0 V), enabling use on high-speed signal lines without signal integrity degradation.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected downstream components. |
| PPPM | 1500 W - Peak pulse power handling capability; enables suppression of high-energy transients like ISO 7637-2 Pulse 5a. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports protection against accidental polarity reversal events. |
| TJ max | +150 °C - Maximum junction temperature; allows deployment in engine control units and power converters with elevated ambient temperatures. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, 0.320" × 0.246" footprint (8.13 mm × 6.22 mm), MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp anode connection | Connected to protected line (e.g., 12 V rail); conducts during overvoltage to shunt energy to ground. |
| Anode | Reference/ground return path | Connected to system ground or low-impedance return plane; completes clamping current path during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use with extended temperature cycling, humidity, and mechanical shock testing. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; supports green manufacturing and end-of-life compliance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts), improving clamping precision. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across thermal and humidity stress. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT assembly lines using 260 °C lead-free profiles. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and input filter capacitor to limit voltage excursion to ≤29.2 V. Use Value: Prevents permanent damage to 36 V-rated DC-DC controllers and microcontrollers during 120 V/100 ms surges. | Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to ground, activated only during >18 V transients. Use Value: Maintains sub-1 µA leakage at 18 V, preserving loop accuracy while clamping 500 V/1 µs spikes to safe levels. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary surge limiter on 48 V DC input, upstream of DC-DC converter and hot-swap controller. Use Value: Withstands 1500 W pulses without degradation, enabling single-stage protection architecture and reducing BOM count. | Use Scenario: Secondary-side overvoltage protection on 5 V/9 V/12 V USB-C PD adapter outputs against regulator failure or feedback loop loss. IC Role / Device Role / Timing Role: Fast-clamping TVS between output rail and ground, triggered only when output exceeds 18 V. Use Value: Limits fault voltage to 29.2 V within nanoseconds, preventing catastrophic failure of connected smartphones or laptops. |
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 RθJA = 110 °C/W). | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD), not ISO 7637-2 load dump. | Select when space-constrained and surge energy is limited to ≤400 W. |
| SMCJ18AHE3_A/H | Same electrical specs and SMC package; RoHS-compliant but not halogen-free; no AEC-Q101 qualification. | Limited to commercial/industrial use; not approved for automotive production. | Select for cost-sensitive non-automotive designs where halogen-free and AEC-Q101 are not required. |
Compared with SMCJ18AHE3_A/H, the SMCJ18AHM3/H adds halogen-free construction and AEC-Q101 qualification - essential for Tier 1 automotive supply chains - while matching all electrical ratings. Versus SMAJ18A-M3/86A, it delivers 3.75× higher surge power handling in a larger but thermally superior package.
Availability
SMCJ18AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCJ18AHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMCJ18AHM3/H under a 10/1000 µs surge?
The SMCJ18AHM3/H has a maximum clamping voltage (VC) of 29.2 V at 51.4 A peak pulse current (IPPM) for 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 standardized surge events. The SMCJ18AHM3/H maintains this clamping performance across its full operating temperature range.
Is the SMCJ18AHM3/H qualified for automotive applications?
Yes, the SMCJ18AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394. It undergoes rigorous stress testing including temperature cycling, humidity bias, and mechanical shock, making it suitable for under-hood and chassis-mounted automotive electronics. The SMCJ18AHM3/H meets the reliability requirements for production automotive programs.
What does the "HM3" suffix indicate in SMCJ18AHM3/H?
The "HM3" suffix in SMCJ18AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS-compliant, AEC-Q101, but not halogen-free) and "E3/M3" (commercial-grade only). The "H" package code indicates 7-inch tape-and-reel packaging (850 units/reel), and the "/H" revision suffix aligns with Vishay's documented revision tracking per ordering information table.
Can the SMCJ18AHM3/H be used in bidirectional configurations?
No, the SMCJ18AHM3/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix in its base part number. Bidirectional variants carry the "CA" suffix (e.g., SMCJ18CA) and exhibit symmetric clamping in both polarities. Using the SMCJ18AHM3/H in reverse-biased configurations risks permanent damage due to forward conduction beyond its 200 A IFSM rating. Always match polarity marking (cathode band) to circuit grounding scheme.
What is the thermal resistance of the SMCJ18AHM3/H, and how does it affect PCB layout?
The SMCJ18AHM3/H has RθJA = 75 °C/W (junction-to-ambient) and RθJL = 15 °C/W (junction-to-lead) when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under 6.5 W steady-state dissipation, designers must provide adequate copper area and minimize trace length to ground planes. The SMCJ18AHM3/H's low RθJL makes thermal performance highly dependent on solder joint quality and pad thermal coupling.
SMCJ18AHM3/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:
- Discontinued at Digi-Key
- 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):
- 51.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ18AHM3/H FAQ
1.How can I place an order for SMCJ18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHM3/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 SMCJ18AHM3/H reliable?
The price and inventory of SMCJ18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHM3/H?
SMCJ18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHM3/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 SMCJ18AHM3/H?
For technical support, including SMCJ18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHM3/H requirements.
6.How does Aetrix verify that SMCJ18AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHM3/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 SMCJ18AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ18AHM3/H?
All SMCJ18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHM3/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 SMCJ18AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHM3/H Tags
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