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Vishay General Semiconductor - Diodes Division SMCJ18CAHM3_A/I
- Part No.:
- SMCJ18CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,239
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Product details
Overview
SMCJ18CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust ESD and surge protection on signal/power lines. It features 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 1500 W peak pulse power (10/1000 µs), <1.0 µA reverse leakage at VWM, and clamps to ≤29.2 V at 51.4 A IPPM - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ18CAHM3_A/I datasheet, SMCJ18CAHM3_A/I pinout, SMCJ18CAHM3_A/I application, or SMCJ18CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1.0 µA ID at 18 V), but triggers into low-impedance conduction when transients exceed VBR (20.0–22.1 V), limiting downstream voltage to ≤29.2 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
Designed for bidirectional surge suppression, SMCJ18CAHM3_A/I supports symmetrical clamping in both polarities without polarity marking. It meets MSL Level 1 per J-STD-020, withstands 260 °C lead-free reflow, and is qualified to AEC-Q101 for automotive use - distinguishing it from commercial-grade E3/M3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown threshold range defining turn-on precision |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 10/1000 µs surge, directly limiting IC stress |
| PPPM | 1500 W - peak transient power handling capacity under standardized waveform |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| RθJA | 75 °C/W - thermal resistance indicating required PCB copper area for safe 6.5 W steady-state dissipation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); polarity unmarked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Bidirectional terminal pair | No functional polarity - either terminal serves as cathode or anode depending on transient polarity |
| Anode (Cathode) | Bidirectional terminal pair | Electrically symmetric; no band marking required per spec - simplifies layout and orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance |
| Low incremental surge resistance | Enables tighter clamping (VC = 29.2 V) and higher energy absorption efficiency |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow without preconditioning or special handling |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, critical for long-term reliability in harsh environments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional shunt clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to 3.3 V/5 V sensor signal conditioning circuitry while maintaining signal fidelity. | Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers against induced surges from relay switching and motor drives. IC Role / Device Role: Primary front-end TVS on field-side I/O connectors, coordinated with gas discharge tubes or MOVs for multi-stage protection. Use Value: Absorbs 1500 W surges without degradation, enabling reliable operation in factory-floor electromagnetic environments per IEC 61000-4-5. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Protecting Ethernet PHYs and PoE injectors from lightning-induced surges on twisted-pair data lines. IC Role / Device Role: Secondary-level TVS after primary GDT/MOV stages, providing precise low-clamp protection for sensitive silicon. Use Value: Clamps to 29.2 V within nanoseconds, preserving PHY integrity during 10/1000 µs telecom surges up to 51.4 A. | Use Scenario: Input-stage surge suppression in AC-DC adapters for smart home devices subjected to mains-borne transients. IC Role / Device Role: Bidirectional clamp across bridge rectifier outputs or DC bus rails to protect downstream SMPS controllers. Use Value: Handles repetitive 1500 W pulses without parameter shift, supporting UL 62368-1 compliance and 10-year product lifetimes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CAHE3_A/I | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA) | Not suitable for 1500 W surge requirements; limited to lower-energy consumer interfaces | Select only if board space is constrained and surge threat level is ≤400 W (e.g., USB ports) |
| SMCJ18CAHE3_A/I | Same electrical specs, identical SMC package, but RoHS-compliant without halogen-free certification | Acceptable for commercial/industrial use where halogen-free mandate does not apply | Choose when AEC-Q101 is unnecessary and halogen-free compliance is not required by OEM specification |
Compared with SMCJ18CAHM3_A/I, SMAJ18CAHE3_A/I trades surge capacity for size, while SMCJ18CAHE3_A/I retains full performance but omits halogen-free assurance - making SMCJ18CAHM3_A/I the sole choice for AEC-Q101 + halogen-free automotive designs.
Availability
SMCJ18CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply, long-lifecycle support, and certified environmental compliance.
Supply support for SMCJ18CAHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in demanding environments; SMCJ18CAHM3_A/I specifically addresses automotive-grade, halogen-free surge protection needs for safety-critical sensor and communication subsystems.
FAQ
What is the clamping voltage of SMCJ18CAHM3_A/I at its rated peak pulse current?
The SMCJ18CAHM3_A/I clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 51.4 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified per Vishay's characterization in Document Number 88394. The low clamping ratio (VC/VBR ≈ 1.39) reflects high surge energy handling efficiency in the SMCJ18CAHM3_A/I.
Is SMCJ18CAHM3_A/I suitable for automotive applications?
Yes, SMCJ18CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix denoting halogen-free, RoHS-compliant construction validated for automotive use. It is specified for operation from –55 °C to +150 °C and meets MSL Level 1 for lead-free assembly - making SMCJ18CAHM3_A/I appropriate for engine control units, body electronics, and ADAS sensor modules.
How does the bidirectional design of SMCJ18CAHM3_A/I affect PCB layout?
The SMCJ18CAHM3_A/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout, reduces assembly errors, and allows flexible routing on differential lines or AC-coupled paths. Its SMC (DO-214AB) footprint requires 8.0 mm × 8.0 mm copper pads per terminal for thermal and surge performance - consistent across all SMCJ18CAHM3_A/I implementations.
What is the maximum reverse leakage current for SMCJ18CAHM3_A/I at its standoff voltage?
At its 18 V standoff voltage (VWM), the SMCJ18CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage minimizes standby power loss and avoids false triggering in high-impedance sensing circuits - a critical parameter confirmed in Vishay's Electrical Characteristics table for all CA-suffix bidirectional SMCJ devices including SMCJ18CAHM3_A/I.
Does SMCJ18CAHM3_A/I require derating at elevated ambient temperatures?
Yes, SMCJ18CAHM3_A/I must be derated above 25 °C ambient per Figure 2 in Vishay Document 88394. Its peak pulse power decreases linearly with junction temperature, and its steady-state power dissipation (PD = 6.5 W) is limited by thermal resistance RθJA = 75 °C/W. For reliable operation at 100 °C ambient, the SMCJ18CAHM3_A/I must be mounted on adequate copper area and may require reduced surge repetition rates - all defined in the official SMCJ18CAHM3_A/I thermal curves.
SMCJ18CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ18CAHM3_A/I FAQ
1.How can I place an order for SMCJ18CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAHM3_A/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 SMCJ18CAHM3_A/I reliable?
The price and inventory of SMCJ18CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ18CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAHM3_A/I?
SMCJ18CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAHM3_A/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 SMCJ18CAHM3_A/I?
For technical support, including SMCJ18CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ18CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAHM3_A/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 SMCJ18CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ18CAHM3_A/I?
All SMCJ18CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAHM3_A/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 SMCJ18CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ18CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CAHM3_A/I Tags
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