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Taiwan Semiconductor Corporation SMCJ18CA
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- Part No.:
- SMCJ18CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CA.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:18,411
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Product details
Overview
SMCJ18CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20V minimum breakdown voltage (VBR), and 29.2V maximum clamping voltage (VC) at 53A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ18CA datasheet, SMCJ18CA pinout, SMCJ18CA application, or SMCJ18CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (CA suffix = bipolar), and thermal derating above 25°C ambient per Fig.2.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-1.0ps response time from 0V to VBR min, enabling effective suppression of fast EFT/burst transients. Its symmetrical I-V characteristics ensure identical clamping behavior in both polarities, critical for protecting AC-coupled or floating signal lines.
The device operates across –55°C to +150°C junction temperature range and features 10°C/W junction-to-case thermal resistance (RθJC), supporting high-reliability mounting on thermally robust PCBs. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC/AC bias margin for protected circuitry. |
| VBR (min) | 20 V @ IT = 1 mA - Minimum voltage at which device enters avalanche conduction; ensures reliable turn-on during transients exceeding system rail. |
| VC @ IPPM | 29.2 V @ 53 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 30 V for 24 V automotive systems. |
| PPK | 1500 W - Peak pulse power rating at TA = 25°C; supports single-event surges per ISO 7637-2 without degradation. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; negligible power loss and signal integrity impact in standby mode. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with proper thermal design. |
Pinout & Package
Package: DO-214AB (SMC) - Surface-mount plastic case with matte tin-plated leads, 0.210 g mass, polarity indicated by cathode band (not applicable for bidirectional CA variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche terminals | No polarity marking required; terminals interchangeable - enables placement flexibility and eliminates orientation errors in automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR (20–22.1 V) and VC (29.2 V) in both directions - protects differential buses (e.g., CAN H/L) without external polarity management. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (EFT) - meets OEM automotive EMC requirements out-of-box. |
| Sub-1 ps response | Typically <1.0 ps from 0 V to VBR min - intercepts nanosecond-scale transients before sensitive logic or analog inputs are disturbed. |
| Moisture sensitivity level 1 | MSL Level 1 per J-STD-020 - no bake requirement prior to reflow; compatible with standard SMT assembly lines without process modification. |
Applications
| Automotive Power Distribution | Industrial CAN Bus Protection |
|---|---|
Use Scenario: 24 V battery rail in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontroller power inputs. Use Value: Limits transient voltage to ≤29.2 V during 1500 W surges, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. |
Use Scenario: High-noise factory floor with motor drives inducing common-mode transients on CAN FD networks. IC Role / Device Role / Timing Role: Bidirectional line protector on CAN_H and CAN_L differential pair, mounted adjacent to connector. Use Value: Symmetrical clamping maintains differential integrity while suppressing ±29.2 V common-mode spikes - preserves bit error rate below 10⁻¹². |
| LED Driver Output Stage | Smart Meter AC Input Protection |
Use Scenario: Constant-current LED driver output subjected to inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Snubber element across output terminals to absorb energy from flyback transients. Use Value: Absorbs 1500 W peak pulses without degradation, extending MOSFET lifetime and eliminating need for external RC snubbers. |
Use Scenario: Mains-connected smart meter exposed to lightning-induced surges on 230 V AC input lines. IC Role / Device Role / Timing Role: Secondary-stage TVS after MOV primary protection, providing precise clamping for bridge rectifier and MCU power supply. Use Value: Tight 20–22.1 V VBR window ensures early conduction before 30 V-rated input capacitors reach derating limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600 W; VBR = 20–22.1 V; VC = 29.2 V @ 20.5 A. | Lower surge capacity suits consumer-grade 12 V systems but insufficient for automotive load dump per ISO 7637-2 Pulse 5a. | Select SMBJ18CA only when board space constraints prevent DO-214AB use and peak surge energy is ≤600 W. |
| 1.5KE18CA (ON Semiconductor) | Through-hole DO-201 package; PPK = 1500 W; VBR = 19.6–22.8 V; VC = 27.7 V @ 54.2 A; higher IR = 5 µA @ VWM. | Requires wave soldering or hand assembly; better clamping voltage but incompatible with automated SMT lines. | Choose 1.5KE18CA for legacy through-hole designs or where tighter VC tolerance justifies manual assembly cost. |
Compared with SMBJ18CA and 1.5KE18CA, the SMCJ18CA delivers identical clamping performance in a surface-mount DO-214AB package optimized for high-power automotive SMT production, balancing surge robustness, automated manufacturability, and thermal dissipation.
Availability
SMCJ18CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial CAN bus protection, LED driver output stages, and smart meter AC input protection requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SMCJ18CA 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 semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949-certified automotive production lines.
The SMCJ series was engineered specifically for ISO 7637-2-compliant transient suppression in 12 V/24 V automotive and industrial power systems, emphasizing high PPK density, bidirectional symmetry, and SMT manufacturability in DO-214AB.
FAQ
What does the 'CA' suffix indicate in SMCJ18CA?
The 'CA' suffix denotes a bidirectional configuration - meaning the SMCJ18CA functions identically in both polarities, with symmetric breakdown (20–22.1 V) and clamping (29.2 V) characteristics. This eliminates polarity marking on PCBs and enables direct protection of AC-coupled or differential signal lines like CAN or RS-485 without external diode pairing.
How does SMCJ18CA meet ISO 7637-2 Pulse 2b requirements?
The SMCJ18CA clamps transients to ≤29.2 V at 53 A (10/1000 µs waveform), well within the ±50 V, 100 A test limits of ISO 7637-2 Pulse 2b (battery disconnection). Its sub-1 ps response ensures suppression initiates before the 10 µs rise time of the pulse, preventing overshoot into protected circuitry.
Can SMCJ18CA replace unidirectional SMCJ18A in existing designs?
No - the SMCJ18CA is bidirectional while SMCJ18A is unidirectional; substituting them requires verifying circuit topology. In DC-biased rails, SMCJ18A provides forward conduction path and reverse clamping, whereas SMCJ18CA clamps in both directions and may conduct during normal forward bias if VWM is exceeded. Layout and system-level polarity must be re-evaluated.
What is the maximum allowable PCB trace length between SMCJ18CA and protected IC?
To maintain sub-1 ps effectiveness, PCB trace inductance must be minimized: keep total loop inductance ≤10 nH. For typical FR-4, this translates to ≤5 mm total trace + return path length. Place SMCJ18CA directly across the protected node and ground plane, using multiple vias to ground and avoiding routing under the device body.
Does SMCJ18CA require derating at elevated ambient temperatures?
Yes - the SMCJ18CA's 1500 W peak power rating applies only at TA = 25°C. Derating follows Fig.2 in the datasheet: at 85°C ambient, maximum PPK drops to ~900 W. Thermal design must ensure junction temperature remains ≤150°C under worst-case surge repetition and steady-state power dissipation (PD = 5 W).
SMCJ18CA 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:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ18CA FAQ
1.How can I place an order for SMCJ18CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CA 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 SMCJ18CA reliable?
The price and inventory of SMCJ18CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CA is usually 5 days.
3.What payment methods are accepted for SMCJ18CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CA?
SMCJ18CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CA 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 SMCJ18CA?
For technical support, including SMCJ18CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CA requirements.
6.How does Aetrix verify that SMCJ18CA is sourced from the original manufacturer or authorized distributors?
All SMCJ18CA 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 SMCJ18CA meets industry standards.
7.What is the process for return or replacement of SMCJ18CA?
All SMCJ18CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CA, 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 SMCJ18CA part is unused and in its original packaging.
Return procedure for SMCJ18CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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