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Vishay General Semiconductor - Diodes Division SMCJ18CAHM3_A/H
- Part No.:
- SMCJ18CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
SMCJ18CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 µs waveform. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), and clamps to ≤29.2 V at 51.4 A peak pulse current - deployed for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMCJ18CAHM3_A/H datasheet, SMCJ18CAHM3_A/H pinout, SMCJ18CAHM3_A/H application, or SMCJ18CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for reliable surge protection in space-constrained PCB layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMC package supports automated placement and meets MSL level 1 per J-STD-020 at 260 °C peak reflow.
The device delivers 1500 W peak pulse power handling under standardized 10/1000 µs surge conditions, with clamping voltage tightly controlled at ≤29.2 V at rated IPPM. Its 1.0 µA maximum reverse leakage at VWM (18 V) and ±0.092 %/°C temperature coefficient of VBR support stable performance across -55 °C to +150 °C operating junction range.
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 - Confirmed breakdown threshold range for bidirectional conduction |
| VC @ IPPM | ≤29.2 V at 51.4 A - Clamped voltage during full-rated 1500 W transient, defining protected circuit stress |
| PPPM | 1500 W - Peak pulse power dissipation capability with 10/1000 µs waveform |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads |
| TJ max | +150 °C - Maximum allowable junction temperature for sustained reliability |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant - Validated for automotive-grade production use |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Interchangeable terminals; conducts equally in either direction during overvoltage events |
| Case | Thermal interface | Exposed metal slug provides primary heat dissipation path to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns |
| 1500 W peak pulse rating | Withstands high-energy transients from inductive switching or ESD in automotive power electronics |
| AEC-Q101 qualification | Validated reliability for under-hood and chassis-mounted applications per automotive stress test requirements |
| Halogen-free & RoHS | Meets environmental compliance mandates for global OEM supply chains without compromising surge robustness |
| MSL Level 1 | Supports lead-free reflow assembly at 260 °C peak without moisture-induced failure risk |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V battery-fed ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail to clamp ±100 V transients within 1 ns response time. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤29.2 V, preventing latch-up or gate oxide damage. | Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal and ground to suppress EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity with <1.0 µA leakage at 18 V, avoiding DC offset errors in 16-bit ADC front-ends. |
| Consumer Power Adapters | Telecom Line Interface Cards |
Use Scenario: Input-stage surge protection in USB-C PD chargers exposed to mains-borne surges. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side 20 V bus, coordinated with MOV and fuse. Use Value: Absorbs 1500 W pulses without degradation, enabling compact design with no derating below 85 °C ambient. | Use Scenario: Ethernet PHY port protection on PoE-powered network switches. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pairs (e.g., TX+/TX−) to handle common-mode lightning-induced surges. Use Value: Symmetrical clamping ensures balanced voltage excursion, preserving signal skew and jitter performance. |
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/H | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for lower-energy transients or space-constrained consumer boards; not AEC-Q101 qualified | Select when board area is critical and surge energy remains below 400 W - verify thermal margin at 125 °C ambient |
| SMCJ18AHE3_A/H | Unidirectional version; same VWM/VBR/PPPM but cathode-marked; VF = 3.5 V at 100 A | Required where DC bias polarity is fixed and forward conduction must be blocked | Choose only if system topology enforces unidirectional operation - e.g., DC power input with known polarity |
Compared with SMCJ18CAHM3_A/H, SMAJ18CAHE3_A/H trades surge capacity and automotive qualification for smaller size, while SMCJ18AHE3_A/H replaces bidirectional symmetry with unidirectional blocking - neither is pin-compatible, and layout adaptation is required for either alternative.
Availability
SMCJ18CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, telecom line cards, and consumer adapter designs requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMCJ18CAHM3_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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where 1500 W clamping, AEC-Q101 validation, and DO-214AB thermal robustness are mandatory.
FAQ
What is the clamping voltage of SMCJ18CAHM3_A/H at its rated peak pulse current?
The SMCJ18CAHM3_A/H clamps to a maximum of 29.2 V at its rated peak pulse current of 51.4 A (10/1000 µs waveform). This value defines the upper voltage limit imposed on protected circuits during worst-case transient events and is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal. The SMCJ18CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ18CAHM3_A/H suitable for automotive applications?
Yes, SMCJ18CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use, with ordering code suffix "HM3" indicating halogen-free, RoHS-compliant, and AEC-Q101 validated construction. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance relevant to under-hood and chassis-mounted electronics. The SMCJ18CAHM3_A/H is commonly deployed in body control modules, ADAS power supplies, and infotainment system protection.
How does the bidirectional nature of SMCJ18CAHM3_A/H affect its circuit placement?
The SMCJ18CAHM3_A/H has no polarity marking and functions identically in both directions, allowing placement across any two nodes subject to bidirectional transients - such as differential signal pairs, AC power rails, or floating sensor outputs. Unlike unidirectional TVS diodes, the SMCJ18CAHM3_A/H eliminates orientation errors during automated assembly and avoids forward conduction issues in AC-coupled paths. Its symmetrical behavior is confirmed in the datasheet's electrical characteristics table for bidirectional types.
What is the thermal resistance of SMCJ18CAHM3_A/H, and how does it impact PCB layout?
The SMCJ18CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package outline drawing. To maintain safe junction temperatures under repeated surges, designers must allocate adequate copper area and consider thermal vias beneath the SMC (DO-214AB) slug. The SMCJ18CAHM3_A/H thermal performance degrades significantly with smaller pads or insufficient copper, risking premature failure.
Does SMCJ18CAHM3_A/H have a specified junction capacitance value?
No junction capacitance (CJ) value is specified for SMCJ18CAHM3_A/H in the official Vishay datasheet (Document Number: 88394, Revision: 09-Jan-2024). While Figure 4 shows typical CJ curves for unidirectional SMCJ devices, the datasheet explicitly states those curves do not apply to bidirectional variants like SMCJ18CAHM3_A/H. For high-frequency signal line protection where capacitance matters, designers should consult Vishay's application notes or select a TVS family with published CJ data - the SMCJ18CAHM3_A/H is optimized for power-level surge suppression, not RF signal integrity.
SMCJ18CAHM3_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:
- -
- 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/H FAQ
1.How can I place an order for SMCJ18CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAHM3_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 SMCJ18CAHM3_A/H reliable?
The price and inventory of SMCJ18CAHM3_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 SMCJ18CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ18CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAHM3_A/H?
SMCJ18CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAHM3_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 SMCJ18CAHM3_A/H?
For technical support, including SMCJ18CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ18CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAHM3_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 SMCJ18CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ18CAHM3_A/H?
All SMCJ18CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAHM3_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 SMCJ18CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ18CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CAHM3_A/H Tags
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