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Taiwan Semiconductor Corporation SMCJ18CH
- Part No.:
- SMCJ18CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CH.pdf
- Description:
- 1500W, 22.2V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,919
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Product details
Overview
SMCJ18CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20–24.4V breakdown voltage (VBR), and 32.2V maximum clamping voltage (VC) at 48A peak pulse current - designed to protect automotive power lines and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ18CH datasheet, SMCJ18CH pinout, SMCJ18CH application, or SMCJ18CH equivalent, this device delivers AEC-Q101 qualification, sub-1ps response time, <1μA reverse leakage above 10V, glass-passivated junction, and bidirectional ESD/transient immunity for robust front-end protection in harsh environments.
Technical Context
The SMCJ18CH is a unidirectional/bidirectional TVS diode configured as a single die in a DO-214AB package, with polarity marked by cathode band (unidirectional) or symmetric marking (bidirectional CH suffix). 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.
Its thermal design supports 10°C/W junction-to-case and 55°C/W junction-to-ambient resistance, enabling reliable 1500W peak pulse power dissipation at TA = 25°C with derating above ambient. Electrical behavior is defined per ANSI/IEEE C62.35, with clamping tested using 10/1000μs waveform per REA standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20 / 24.4 V @ IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients |
| VC @ IPPM | 32.2 V @ 48 A - Clamping voltage limits downstream IC stress during 10/1000μs surge events |
| PPK | 1500 W - Peak pulse power rating defines transient energy absorption capability |
| IR @ VWM | <1 μA - Ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables operation in under-hood automotive and high-temperature industrial enclosures |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, UL 94V-0 molding compound, 0.210g weight. Polarity marked with cathode band for unidirectional variants; SMCJ18CH is bidirectional - no cathode band, symmetric terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry (reverse bias) | Accepts surge current during negative-going transients; bidirectional symmetry allows either terminal to serve as anode or cathode |
| Cathode (Terminal 2) | Transient current entry (forward bias) | Accepts surge current during positive-going transients; identical electrical behavior to Terminal 1 in bidirectional configuration |
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 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge) without degradation |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress vs. epoxy-passivated alternatives |
| Sub-1 ps response time | Enables clamping before sensitive downstream circuitry experiences overvoltage - critical for CAN, LIN, and sensor interface protection |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs, body control modules, and lighting drivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary front-end TVS clamp placed between power input and DC-DC converter input stage. Use Value: Limits voltage to ≤32.2V during 1500W transients, preventing damage to 36V-rated input capacitors and LDOs. | Use Scenario: Shielding 24V digital input channels on programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Bidirectional transient suppressor mounted directly at connector entry point before optocoupler or Schmitt trigger input. Use Value: Withstands repeated 1kV/500A ISO 7637-2 Pulse 2b events while maintaining <1μA leakage for accurate logic-level sensing. |
| Telecom Base Station DC Feeds | Medical Diagnostic Equipment Power Rails |
Use Scenario: Safeguarding -48V DC power inputs of remote radio units and backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS deployed across DC input terminals to absorb common-mode and differential-mode transients. Use Value: Clamps to 32.2V within <1ps, ensuring downstream DC-DC converters remain within safe operating area during multi-kA surge events. | Use Scenario: Protecting isolated 5V/12V auxiliary rails in MRI and ultrasound systems from ESD and switching noise coupling. IC Role / Device Role / Timing Role: Secondary-level TVS on low-noise analog supply paths where leakage and capacitance must be minimized. Use Value: Sub-1μA IR avoids loading precision references; DO-214AB footprint enables compact layout near sensitive ADC/DAC sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | 600W peak power, SMB package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or sustained load dump | Select when board space is constrained and surge energy does not exceed 600W |
| 1.5KE18CA | Through-hole DO-201 package, 1500W rating, slower response (~1ns), higher clamping (35.5V) | Requires PCB real estate and wave soldering; less suitable for automated SMT lines | Select for legacy through-hole designs or where manual assembly is preferred |
Compared with SMBJ18CA and 1.5KE18CA, the SMCJ18CH delivers higher surge robustness in a surface-mount package with faster response and tighter clamping - making it optimal for AEC-Q101-compliant automotive and high-reliability industrial applications requiring automated placement and ISO 7637-2 immunity.
Availability
SMCJ18CH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ18CH 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, TVS diodes, rectifiers, and MOSFETs with global distribution and AEC-Q101 validation capability.
The SMCJ series is engineered for high-energy transient suppression in automotive and industrial environments, emphasizing rugged packaging, fast response, and compliance with ISO 7637-2 and AEC-Q101 standards.
FAQ
What is the polarity configuration of the SMCJ18CH?
The SMCJ18CH is a bidirectional TVS diode - it has no designated anode or cathode and functions identically in both directions. Unlike unidirectional SMCJ18H variants marked with a cathode band, the CH suffix indicates symmetrical terminal behavior, making it ideal for AC-coupled or floating-line protection where polarity reversal may occur.
Does the SMCJ18CH meet AEC-Q101 requirements?
Yes, the SMCJ18CH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This includes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD), confirming suitability for automotive powertrain, chassis, and body electronics applications where reliability under thermal and electrical stress is mandatory.
What is the maximum clamping voltage of the SMCJ18CH and at what current is it specified?
The SMCJ18CH has a maximum clamping voltage (VC) of 32.2 V, measured at a peak pulse current (IPPM) of 48 A using the standardized 10/1000 μs double-exponential waveform. This value ensures downstream components see limited overvoltage during worst-case transient events, supporting robust system-level immunity design.
How does the SMCJ18CH differ from the SMCJ18AH variant?
The SMCJ18AH features a tighter breakdown voltage range (20–22.1 V) versus the SMCJ18CH (20–24.4 V), resulting in earlier turn-on but potentially higher leakage at elevated temperatures. The SMCJ18CH offers broader VBR tolerance and is optimized for bidirectional use, while SMCJ18AH is unidirectional and intended for DC-biased applications where precise low-threshold clamping is prioritized.
Is the SMCJ18CH compatible with lead-free reflow processes?
Yes, the SMCJ18CH uses matte tin-plated leads compliant with J-STD-002 for solderability and is rated for moisture sensitivity level 1 per J-STD-020 - meaning it can be subjected to standard Pb-free reflow profiles (e.g., JEDEC J-STD-020D peak of 260°C) without baking or special handling, supporting high-yield automated assembly.
SMCJ18CH 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:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 48A
- 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)
SMCJ18CH FAQ
1.How can I place an order for SMCJ18CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CH 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 SMCJ18CH reliable?
The price and inventory of SMCJ18CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CH is usually 5 days.
3.What payment methods are accepted for SMCJ18CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CH?
SMCJ18CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CH 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 SMCJ18CH?
For technical support, including SMCJ18CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CH requirements.
6.How does Aetrix verify that SMCJ18CH is sourced from the original manufacturer or authorized distributors?
All SMCJ18CH 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 SMCJ18CH meets industry standards.
7.What is the process for return or replacement of SMCJ18CH?
All SMCJ18CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CH, 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 SMCJ18CH part is unused and in its original packaging.
Return procedure for SMCJ18CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CH Tags
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