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Vishay General Semiconductor - Diodes Division SMCJ18AHM3/I
- Part No.:
- SMCJ18AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHM3/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,893
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Product details
Overview
SMCJ18AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 51.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ18AHM3/I datasheet, SMCJ18AHM3/I pinout, SMCJ18AHM3/I application, or SMCJ18AHM3/I equivalent, key selection criteria include clamping performance under 51.4 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18AHM3/I operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 20.0–22.1 V breakdown threshold, clamping transients to ≤29.2 V within picoseconds. Its glass-passivated junction ensures stable leakage (<1.0 µA at 18 V) and low incremental surge resistance, enabling robust protection against ISO 7637-2 load dump and IEC 61000-4-5 surges.
Designed for surface-mount use in SMC (DO-214AB) package, it supports MSL level 1 handling (peak reflow 260 °C), matte tin-plated leads compliant with J-STD-002, and meets JESD 201 class 2 whisker resistance. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Ensures reliable turn-on across process variation and temperature |
| VC @ IPPM | 29.2 V at 51.4 A - Limits downstream IC stress during 10/1000 µs surge events |
| PPPM | 1500 W - Withstands high-energy transients common in 12 V automotive systems |
| RθJA | 75 °C/W - Requires minimum 8.0 mm × 8.0 mm copper pad per terminal for thermal derating |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| ID @ VWM | ≤1.0 µA - Minimizes standby power loss in always-on circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, single-axis cathode-banded case. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); weight 0.211 g; polarity indicated by black band denoting cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line; conducts during overvoltage to shunt surge to ground |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising surge robustness |
| Low incremental surge resistance | Enables tighter clamping (29.2 V) vs. competing 1500 W TVS devices |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift over temperature and time |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-fed ECU input subjected to ISO 7637-2 Pulse 5a load dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Clamps 51.4 A surge to ≤29.2 V, preventing damage to downstream 3.3 V/5 V logic while maintaining <1.0 µA leakage at nominal 12 V operation. | Use Scenario: Analog output line of a pressure sensor exposed to ESD and inductive switching noise in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb fast transients before reaching ADC front-end and op-amp buffers. Use Value: Sub-nanosecond response limits voltage overshoot to safe levels for 16-bit precision analog circuitry, with minimal capacitance impact due to SMC package geometry. |
| Telecom DC Power Feeds | Consumer Device USB Power Rail |
Use Scenario: -48 V telecom power distribution board encountering lightning-induced surges on primary feed lines. IC Role / Device Role / Timing Role: Primary-stage TVS on input bulk capacitor rail to limit energy entering secondary regulation stages. Use Value: 1500 W PPPM rating handles multi-kA surge currents; RθJA = 75 °C/W enables thermal management via PCB copper area without heatsinks. | Use Scenario: 5 V USB VBUS line in portable speaker design facing ESD events per IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Secondary-level TVS after fuse and upstream filtering, protecting USB controller and charging IC. Use Value: 29.2 V clamping prevents latch-up in 5 V tolerant USB PHYs; HM3 suffix ensures compliance with consumer product halogen restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3/A | Lower PPPM (400 W), smaller SMA package, same VWM/VBR range | Not rated for AEC-Q101; limited to commercial-grade consumer/industrial use | Select when surge energy is lower and space-constrained layouts preclude SMC footprint |
| SMCJ18A-M3/57T | Same electrical specs and SMC package, but M3 suffix denotes halogen-free RoHS without AEC-Q101 qualification | Lacks automotive qualification; suitable for industrial/commercial applications requiring halogen-free compliance only | Choose when AEC-Q101 is not required but halogen-free and tape-and-reel delivery are mandatory |
Compared with SMAJ18AHE3/A and SMCJ18A-M3/57T, the SMCJ18AHM3/I uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free RoHS compliance - making it the only option among the three validated for under-hood automotive deployment with full regulatory traceability.
Availability
SMCJ18AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB power rails requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ18AHM3/I 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 is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure resilience and long-term parametric stability are critical.
FAQ
What is the clamping voltage of the SMCJ18AHM3/I under a 10/1000 µs surge?
The SMCJ18AHM3/I clamps to a maximum of 29.2 V when subjected to its rated 51.4 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured at TA = 25 °C with devices mounted on 8.0 mm × 8.0 mm copper pads per terminal, ensuring repeatable thermal conditions during surge testing. The SMCJ18AHM3/I maintains this clamping performance across its full operating junction temperature range (−55 °C to +150 °C), with minor derating above 25 °C per Vishay's Fig. 2.
Is the SMCJ18AHM3/I qualified for automotive applications?
Yes, the SMCJ18AHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SMCJ5.0A–SMCJ188CA datasheet (Document Number: 88394, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS sensor interfaces. The SMCJ18AHM3/I is not just automotive-capable; it is automotive-certified.
What does the "HM3" suffix mean in SMCJ18AHM3/I?
The "HM3" suffix in SMCJ18AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" denotes AEC-Q101 qualification, "M" signifies halogen-free molding compound and terminations, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. The trailing "/I" specifies packaging in 13-inch tape-and-reel format (3500 units per reel), with IEC-compliant moisture sensitivity level (MSL) 1 handling - enabling direct placement without bake-out.
How does the SMCJ18AHM3/I compare to bidirectional variants like SMCJ18CA?
The SMCJ18AHM3/I is unidirectional, meaning it protects only against reverse-polarity transients on a DC line, with polarity marked by a cathode band. In contrast, SMCJ18CA is bidirectional and symmetrical - suitable for AC lines or differential signal pairs where voltage can swing both positive and negative. While both share identical VWM (18 V), PPPM (1500 W), and package (SMC), the SMCJ18AHM3/I offers lower leakage (<1.0 µA) and is optimized for DC power rail protection, whereas SMCJ18CA exhibits matched clamping in both directions but higher ID (≤10 µA).
What PCB layout guidance applies to the SMCJ18AHM3/I for optimal thermal performance?
For optimal thermal performance, the SMCJ18AHM3/I must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay's datasheet (Fig. 2 derating curve and Mechanical Data section). These pads act as heat-sinking planes; reducing pad size increases RθJA beyond the rated 75 °C/W, causing premature thermal shutdown during repeated surges. Trace width to ground should be ≥2 mm, and adjacent thermal vias (≥4×0.3 mm diameter) are recommended to transfer heat to inner layers - especially critical in automotive designs operating continuously at +105 °C ambient.
SMCJ18AHM3/I 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/I FAQ
1.How can I place an order for SMCJ18AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHM3/I 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/I reliable?
The price and inventory of SMCJ18AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ18AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHM3/I?
SMCJ18AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHM3/I 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/I?
For technical support, including SMCJ18AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHM3/I requirements.
6.How does Aetrix verify that SMCJ18AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHM3/I 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/I meets industry standards.
7.What is the process for return or replacement of SMCJ18AHM3/I?
All SMCJ18AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHM3/I, 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/I part is unused and in its original packaging.
Return procedure for SMCJ18AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHM3/I Tags
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