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Vishay General Semiconductor - Diodes Division SMCJ18CAHE3/9AT
- Part No.:
- SMCJ18CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
SMCJ18CAHE3/9AT 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 range (VBR at 1 mA), 1500 W peak pulse power (10/1000 μs), clamping voltage of 29.2 V at 51.4 A, and operates from −55 °C to +150 °C - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ18CAHE3/9AT datasheet, SMCJ18CAHE3/9AT pinout, SMCJ18CAHE3/9AT application, or SMCJ18CAHE3/9AT equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge rating, low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient overvoltages, with symmetrical bidirectional conduction enabling protection on AC-coupled or floating lines without polarity concerns. Its low incremental surge resistance ensures minimal voltage overshoot during high-current transients like ISO 7637-2 Pulse 1/2a/5a or IEC 61000-4-5 surges.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), has matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 - confirming suitability for under-hood automotive electronics where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown onset range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 1500 W surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W (10/1000 μs waveform) - peak surge power handling capacity; supports harsh automotive load-dump immunity. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in high-ambient environments like engine control units. |
| RθJL | 15 °C/W - low junction-to-lead thermal resistance; allows efficient heat transfer to PCB copper during repetitive surges. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case meeting UL 94 V-0; dimensions 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | Accepts surge current in both directions; connects to line under protection (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit (either polarity) | Completes low-impedance path to ground or return rail; symmetric with Anode for bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC, differential, or floating signal lines without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 1500 W peak pulse power | Withstands severe transients such as ISO 7637-2 Pulse 5a (load dump) up to 120 V, 100 ms duration. |
| Low RθJL (15 °C/W) | Supports higher surge repetition rates by minimizing junction temperature rise during sequential events. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak, compatible with standard SMT lines. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine bay against load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output line and chassis ground to clamp transients before they reach ADC input. Use Value: Maintains signal integrity under ISO 16750-2 Class IV (120 V/100 ms) while adding <0.5 pF capacitance to avoid bandwidth degradation. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to motor drive noise and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair, leveraging symmetry to suppress common-mode transients without skew. Use Value: Limits clamped voltage to ≤29.2 V, keeping transceiver within absolute maximum ratings even during 4 kV IEC 61000-4-5 surges. |
| Consumer USB-C Port | Telecom DSL Line Interface |
Use Scenario: ESD and surge protection on USB-C CC and VCONN pins in portable docking stations. IC Role / Device Role / Timing Role: Bidirectional TVS connected between CC pin and ground to absorb ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 μs surges. Use Value: Sub-1 ns response time prevents ESD damage to USB PD controllers; RoHS-compliant matte tin plating ensures solder joint reliability. | Use Scenario: Front-end protection of DSL line drivers/receivers in residential gateways subjected to induced lightning surges. IC Role / Device Role / Timing Role: Primary surge limiter between twisted-pair line and PHY IC, coordinated with gas discharge tube (GDT) for staged protection. Use Value: 1500 W rating handles 10/700 μs telecom surges per ITU-T K.21; bidirectional operation matches AC-coupled DSL signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CAHE3/52T | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer ports but not automotive load-dump duty cycles | Select when board area is critical and surge energy is ≤600 W; verify thermal derating at 125 °C ambient. |
| 1.5KE18CA | Through-hole DO-201 package, same VWM/VC, higher RθJA (30 °C/W), no AEC-Q101 | Used in legacy industrial power supplies where manual assembly or high-reliability through-hole mounting is required | Choose for cost-sensitive non-automotive designs needing identical electrical specs but accepting larger footprint and no automotive qualification. |
Compared with SMCJ18CAHE3/9AT, SMBJ18CAHE3/52T trades surge robustness for compactness, while 1.5KE18CA sacrifices AEC-Q101 and thermal performance for through-hole manufacturability - making SMCJ18CAHE3/9AT the optimal choice for high-energy, automotive-grade SMT protection.
Availability
SMCJ18CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 networks, consumer USB-C interface hardening, and telecom DSL line safeguarding requiring stable component supply across multi-year production programs.
Supply support for SMCJ18CAHE3/9AT 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 optimization.
The SMCJ series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What does the "CA" suffix indicate in SMCJ18CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration: SMCJ18CAHE3/9AT conducts and clamps transient energy equally in both polarities, unlike unidirectional "A" variants that require correct anode/cathode orientation. This makes SMCJ18CAHE3/9AT ideal for AC-coupled or floating signal lines such as CAN bus, RS-485, or audio interfaces where polarity is undefined or reversible.
Is SMCJ18CAHE3/9AT qualified for automotive use?
Yes, SMCJ18CAHE3/9AT carries the "HE3" suffix, signifying RoHS compliance and full AEC-Q101 qualification - verified for temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness. It is approved for under-hood and cabin applications including engine control modules, battery management systems, and ADAS camera interfaces per automotive OEM requirements.
What is the clamping voltage of SMCJ18CAHE3/9AT at its rated surge current?
The clamping voltage (VC) of SMCJ18CAHE3/9AT is 29.2 V measured at its peak pulse current (IPPM) of 51.4 A under the standardized 10/1000 μs waveform. This value defines the maximum voltage imposed on the protected circuit during a 1500 W transient event and is guaranteed across the full operating temperature range (−55 °C to +150 °C).
How does the SMC (DO-214AB) package of SMCJ18CAHE3/9AT affect thermal performance?
The SMC package delivers RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient on 8 mm × 8 mm copper pads), enabling effective heat dissipation during repetitive surges. Unlike smaller SMB or SOD packages, SMC's larger copper exposure supports higher surge repetition rates in automotive and industrial applications without thermal runaway.
Can SMCJ18CAHE3/9AT replace older through-hole TVS diodes like 1.5KE18CA?
SMCJ18CAHE3/9AT provides equivalent electrical specs (VWM = 18 V, VC = 29.2 V) but in a surface-mount SMC package with AEC-Q101 qualification and superior thermal metrics. While not pin-compatible due to differing footprints, it serves as a direct functional upgrade for new designs targeting automated assembly, higher reliability, and automotive compliance - requiring PCB layout revision but no circuit redesign.
SMCJ18CAHE3/9AT 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ18CAHE3/9AT FAQ
1.How can I place an order for SMCJ18CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAHE3/9AT 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 SMCJ18CAHE3/9AT reliable?
The price and inventory of SMCJ18CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAHE3/9AT?
SMCJ18CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAHE3/9AT 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 SMCJ18CAHE3/9AT?
For technical support, including SMCJ18CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ18CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAHE3/9AT 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 SMCJ18CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18CAHE3/9AT?
All SMCJ18CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAHE3/9AT, 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 SMCJ18CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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