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Taiwan Semiconductor Corporation SMCJ120CAH
- Part No.:
- SMCJ120CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CAH.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,082
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Product details
Overview
SMCJ120CAH from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor in DO-214AB (SMC) package, with 120V working stand-off voltage (VWM), 133–147V breakdown voltage (VBR), and 193V clamping voltage (VC) at 8.1A peak pulse current. It delivers AEC-Q101 qualification, ISO 7637-2 compliance, and sub-1ps response for automotive power line surge protection.
For engineers reviewing the SMCJ120CAH datasheet, SMCJ120CAH pinout, SMCJ120CAH application, or SMCJ120CAH equivalent, key selection criteria include bidirectional clamping capability, 1500W peak pulse power rating, 120V VWM tolerance, junction temperature range (−55°C to +150°C), and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
The SMCJ120CAH is a glass-passivated, bipolar TVS diode designed for unidirectional or bidirectional transient suppression in DC power rails and signal lines. Its junction structure enables symmetrical clamping in both polarities, with leakage current ≤1µA at 120V and thermal resistance RθJC = 10°C/W.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and supports fast transient immunity in automotive ECUs, infotainment power supplies, and industrial control I/O interfaces - operating reliably across −55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse voltage before clamping begins; defines safe operating margin above system nominal voltage |
| VBR min/max | 133 V / 147 V @ 1 mA - verified breakdown threshold ensures predictable turn-on during transients |
| VC @ IPPM | 193 V @ 8.1 A - clamping voltage limits downstream component stress during 10/1000µs surge events |
| PPK | 1500 W - peak pulse power handling per single 1ms waveform; derates linearly above 25°C ambient |
| IR @ VWM | ≤1 µA - ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ range | −55°C to +150°C - qualified for under-hood automotive environments and industrial thermal cycling |
| RθJC | 10 °C/W - enables efficient heat transfer to PCB copper pour or heatsink for sustained surge duty |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (bidirectional operation renders band non-functional but retained for marking consistency).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band End | Anode (for unidirectional reference) | Marking only; electrically symmetric - either terminal serves as anode or cathode depending on transient polarity |
| Opposite End | Cathode (for unidirectional reference) | Same as above - bidirectional configuration eliminates functional polarity distinction in SMCJ120CAH |
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 defined load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) without degradation |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Sub-1ps response time | Clamps within 1 picosecond of transient onset - critical for protecting high-speed CAN/LIN transceivers |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing and export |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary bidirectional clamping device placed at main power input before DC-DC converters. Use Value: Limits transient voltage to ≤193V, preventing damage to 36V-rated regulators and microcontrollers. | Use Scenario: Digital input modules receiving 24V sensor signals in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on each channel's signal path before optocoupler or MCU GPIO. Use Value: Absorbs ESD and inductive kickback up to 1500W without latch-up or parameter shift. |
| Telecom Power Supply Input | Renewable Energy Controller Interface |
Use Scenario: 48V DC input stage of base station power supply subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS after primary MOV/GDT staging, providing precise clamping near IC voltage ratings. Use Value: Clamps to 193V with <1µA leakage - avoids standby current penalty while enabling tight overvoltage margins. | Use Scenario: RS-485 communication interface on solar inverter control board interfacing with external sensors. IC Role / Device Role / Timing Role: Bidirectional line protector on differential bus lines, referenced to local ground. Use Value: Symmetric clamping preserves common-mode noise rejection and prevents receiver saturation during ±1kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA | 600W peak power rating; same VWM/VBR/VC specs but lower PPK and higher RθJA (75°C/W) | Suitable for lower-energy transients; not recommended for ISO 7637-2 Pulse 5a (load dump) | Select SMCJ120CAH when 1500W surge headroom or automotive load-dump immunity is required |
| 1.5KE120CA | Through-hole DO-201 package; 1500W rating but slower response (>1ns), higher leakage (5µA), and no AEC-Q101 qualification | Limited to industrial/non-automotive use; incompatible with automated SMT assembly | Choose SMCJ120CAH for surface-mount production, AEC-Q101 compliance, and sub-1ps response |
Compared with SMBJ120CA and 1.5KE120CA, the SMCJ120CAH uniquely combines 1500W SMT packaging, AEC-Q101 qualification, ISO 7637-2 compliance, and sub-1ps response - making it the only option qualified for high-reliability automotive power rail protection in automated manufacturing.
Availability
SMCJ120CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power systems, and renewable energy controller interfaces requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ120CAH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in harsh automotive and industrial power environments - emphasizing low clamping ratio, repeatable surge endurance, and SMT manufacturability.
FAQ
What does the "CAH" suffix indicate in SMCJ120CAH?
The "CAH" suffix denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and halogen-free construction (H). Unlike unidirectional "CH" variants, SMCJ120CAH provides symmetrical clamping in both voltage polarities - essential for protecting AC-coupled or floating signal lines and dual-rail power inputs where polarity reversal may occur during transients.
How does SMCJ120CAH differ from SMCJ120AH?
SMCJ120AH is unidirectional, with a defined anode/cathode and a cathode band marking; SMCJ120CAH is bidirectional, with identical electrical behavior in both directions and no functional polarity. The "C" prefix explicitly indicates bidirectional operation, enabling use in applications like RS-485 buses or transformer-coupled interfaces where voltage reversals occur.
Is SMCJ120CAH compatible with lead-free reflow soldering profiles?
Yes, SMCJ120CAH is qualified for lead-free reflow per J-STD-020 Level 1 (MSL-1), with a maximum peak temperature of 260°C. Its DO-214AB package and matte tin-plated leads meet IPC/JEDEC standards for solderability and intermetallic formation control - supporting standard Pb-free SAC305 profiles without delamination or parametric shift.
What is the maximum clamping voltage of SMCJ120CAH under a 10/1000µs surge?
The maximum clamping voltage (VC) of SMCJ120CAH is 193 V at 8.1 A peak pulse current (IPPM), measured per IEC 61000-4-5 and ISO 7637-2 test conditions. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events.
Does SMCJ120CAH require derating at elevated ambient temperatures?
Yes, SMCJ120CAH must be derated above 25°C ambient per its pulse derating curve (Fig.2). At 85°C ambient, its 1500W peak pulse power rating reduces to approximately 900W - meaning the maximum tolerable IPPM drops to ~6.5A. Designers must consult the official derating graph to ensure safe operation in thermally constrained enclosures.
SMCJ120CAH 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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 8.1A
- 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)
SMCJ120CAH FAQ
1.How can I place an order for SMCJ120CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CAH 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 SMCJ120CAH reliable?
The price and inventory of SMCJ120CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CAH is usually 5 days.
3.What payment methods are accepted for SMCJ120CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CAH?
SMCJ120CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CAH 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 SMCJ120CAH?
For technical support, including SMCJ120CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CAH requirements.
6.How does Aetrix verify that SMCJ120CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ120CAH 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 SMCJ120CAH meets industry standards.
7.What is the process for return or replacement of SMCJ120CAH?
All SMCJ120CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CAH, 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 SMCJ120CAH part is unused and in its original packaging.
Return procedure for SMCJ120CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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