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Taiwan Semiconductor Corporation SMCJ18CAH
- Part No.:
- SMCJ18CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAH.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,688
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Product details
Overview
SMCJ18CAH from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20–22.1V breakdown voltage (VBR), and 29.2V maximum clamping voltage (VC) at 53A peak pulse current. It provides ESD and surge protection for automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMCJ18CAH datasheet, SMCJ18CAH pinout, SMCJ18CAH application, or SMCJ18CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and <1µA reverse leakage above 10V.
Technical Context
The SMCJ18CAH is a glass-passivated, bipolar junction TVS diode designed for unidirectional or bidirectional transient suppression without polarity dependence. Its clamping behavior is defined by a 10/1000µs waveform per REA standards, with thermal resistance RθJC = 10°C/W enabling high-power surge handling in compact surface-mount form.
It operates across -55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. The device delivers stable clamping performance under repetitive transients when derated per Fig.2, with no degradation in VBR or VC after 30ms IT pulse stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 20.0 / 22.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 29.2 V - Clamped voltage seen by protected circuit during 53 A 10/1000µs surge |
| PPK | 1500 W - Peak pulse power dissipation capability for non-repetitive 1 ms surges |
| IR @ VWM | <1 µA - Minimal leakage current ensures low standby power loss in always-on systems |
| Response time | <1.0 ps - Near-instantaneous junction response enables protection against fast ESD events |
| TJ max | +150 °C - Enables operation in under-hood automotive and high-temperature industrial environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band (bidirectional function renders polarity irrelevant in circuit placement).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (dual) | Bidirectional transient path | Either terminal serves as anode or cathode depending on transient polarity; symmetric clamping in both directions |
| Case | Thermal and mechanical interface | DO-214AB body provides 10°C/W junction-to-case thermal path and UL 94V-0 flammability rating |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass passivated junction | Ensures long-term stability of VBR and VC under humidity and thermal stress, critical for 15+ year automotive service life |
| Level 1 MSL | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning risk |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive, enabling use in green electronics manufacturing |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp surges up to ±150V. Use Value: Limits voltage excursion to ≤29.2V during 53A ISO 7637-2 Pulse 5a events, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Shielding 24V digital input modules from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff protection element across input terminals, absorbing energy from inductive switching spikes. Use Value: Clamps transients within 1ps while maintaining <1µA leakage, preserving signal integrity and reducing false triggering in optocoupled inputs. |
| Telecom Base Station Power Rails | Consumer Appliance Motor Control Boards |
Use Scenario: Safeguarding 48V backplane supplies in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC regulators and PMICs. Use Value: Handles 1500W peak pulses without degradation, meeting IEC 61000-4-5 Level 4 requirements with margin. |
Use Scenario: Protecting MCU GPIOs and gate drivers on washing machine motor control boards from commutation noise. IC Role / Device Role / Timing Role: Localized TVS at motor driver output pins to suppress flyback voltages. Use Value: 29.2V clamping ensures MOSFETs remain within safe SOA during 8.3ms half-sine surges up to 200A IFSM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18CA | Same DO-214AC (SMA) package; lower PPK (400W); VBR 20–22.1V; VC = 29.2V @ 27.5A | Lower surge capacity limits use to lighter-duty consumer or non-automotive industrial applications | Select when board space constraints favor SMA footprint and surge energy is ≤400W |
| ON Semiconductor 1.5KE18CA | Through-hole DO-15 package; same 1500W rating; VBR 20–22.2V; VC = 27.7V @ 54.3A | Requires through-hole assembly; better thermal mass but incompatible with fully SMT production | Choose for legacy designs requiring through-hole mounting or higher thermal inertia in high-ambient environments |
Compared with SMAJ18CA and 1.5KE18CA, the SMCJ18CAH offers superior surge robustness in a surface-mount package with AEC-Q101 validation-making it the preferred choice for automotive and high-reliability industrial SMT designs where 1500W clamping and ISO 7637-2 compliance are mandatory.
Availability
SMCJ18CAH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and telecom power rail immunization requiring stable component supply across extended product lifecycles.
Supply support for SMCJ18CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power devices for automotive and industrial markets.
The SMCJ series was developed to deliver AEC-Q101-qualified, high-power surface-mount TVS protection for 12V/24V/48V automotive and industrial power systems subject to ISO 7637-2 and IEC 61000-4-5 stress conditions.
FAQ
What does the 'CA' suffix indicate in SMCJ18CAH?
The 'CA' suffix in SMCJ18CAH denotes a bidirectional configuration - meaning the device functions identically in both forward and reverse bias, providing symmetrical clamping for AC-coupled or polarity-agnostic protection circuits. This distinguishes it from unidirectional variants like SMCJ18H, which require correct polarity orientation during PCB layout. The SMCJ18CAH achieves this using a back-to-back diode structure within a single DO-214AB package.
Is SMCJ18CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes, the SMCJ18CAH is explicitly rated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b - and its 1500W peak power rating, 29.2V clamping voltage at 53A, and 10/1000µs waveform compliance make it appropriate for Pulse 5a mitigation when used with appropriate series impedance (e.g., line impedance matching). It is widely deployed in automotive body control modules and infotainment power supplies for this purpose.
What is the maximum steady-state power dissipation (PD) of SMCJ18CAH?
The SMCJ18CAH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value decreases linearly with ambient temperature above 25°C per the derating curve in Figure 2. For continuous operation, thermal design must ensure junction temperature remains ≤150°C, leveraging the device's RθJA = 55°C/W and RθJC = 10°C/W characteristics.
Does SMCJ18CAH meet lead-free soldering requirements?
Yes, the SMCJ18CAH features matte tin-plated leads compliant with J-STD-002 for solderability and is rated for lead-free reflow profiles per J-STD-020 Level 1. Its moisture sensitivity level (MSL) is Level 1, eliminating the need for dry-packaging or baking prior to SMT assembly - supporting standard high-volume lead-free manufacturing processes without process modification.
How does the clamping voltage (VC) of SMCJ18CAH compare to its unidirectional counterpart SMCJ18AH?
The SMCJ18CAH has a maximum clamping voltage (VC) of 29.2 V at 53 A, while the unidirectional SMCJ18AH specifies VC = 29.2 V at the same current - confirming identical clamping performance in the reverse direction. However, SMCJ18AH cannot clamp in forward conduction (VF ≈ 3.5 V), whereas SMCJ18CAH maintains symmetrical 29.2 V clamping in both polarities, making it essential for AC or floating-rail applications where polarity reversal may occur.
SMCJ18CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 53A
- 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)
SMCJ18CAH FAQ
1.How can I place an order for SMCJ18CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAH 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 SMCJ18CAH reliable?
The price and inventory of SMCJ18CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CAH is usually 5 days.
3.What payment methods are accepted for SMCJ18CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAH?
SMCJ18CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAH 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 SMCJ18CAH?
For technical support, including SMCJ18CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAH requirements.
6.How does Aetrix verify that SMCJ18CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAH 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 SMCJ18CAH meets industry standards.
7.What is the process for return or replacement of SMCJ18CAH?
All SMCJ18CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAH, 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 SMCJ18CAH part is unused and in its original packaging.
Return procedure for SMCJ18CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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