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Taiwan Semiconductor Corporation SMCJ120CH
- Part No.:
- SMCJ120CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CH.pdf
- Description:
- 1500W, 148V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,379
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Product details
Overview
SMCJ120CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 120V working stand-off voltage (VWM), 133–163V breakdown voltage (VBR), and 214V maximum clamping voltage (VC) at 7.3A 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 SMCJ120CH datasheet, SMCJ120CH pinout, SMCJ120CH application, or SMCJ120CH equivalent, this device is selected for high-energy surge immunity in AEC-Q101-compliant systems where fast response (<1.0 ps), low leakage (<1 µA @ 120V), and bidirectional clamping symmetry are critical design requirements.
Technical Context
The SMCJ120CH implements a glass-passivated silicon junction optimized for unidirectional or bidirectional transient suppression without external polarity constraints. Its bidirectional configuration enables symmetrical clamping in both polarities, meeting ISO 7637-2 test pulses across automotive supply rails and signal lines.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting operation from –55°C to +150°C junction temperature. It sustains 1500W peak pulse power (tp = 1 ms) and 200A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 163 V @ IT = 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 214 V @ 7.3 A - Clamped voltage during 10/1000 µs surge, defining protected circuit voltage ceiling |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient, derated above 25°C ambient |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off, ensuring minimal standby power loss |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.210 g mass, UL 94V-0 molding, matte tin leads |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical stress |
Pinout & Package
DO-214AB (SMC) package: dual-leaded, molded plastic case with cathode band marking for unidirectional variants; SMCJ120CH is bidirectional and marked with "GHF" code - no polarity marking required. Leads are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminal pair | Interchangeable terminals - identical clamping behavior in either polarity; no fixed anode/cathode assignment |
| Case | Non-connected thermal path | Plastic body provides electrical isolation; thermal conduction occurs only through leads to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and powertrain applications requiring extended temperature and lifetime reliability |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge) |
| Fast response time | <1.0 ps rise from 0 V to VBR min - ensures clamping activation before sensitive downstream circuitry is overstressed |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for harsh environments |
| Halogen-free construction | Complies with IEC 61249-2-21 - supports RoHS-compliant manufacturing and end-of-life recycling |
Applications
| Automotive Power Line Protection | Industrial I/O Interface Protection |
|---|---|
Use Scenario: 12 V/24 V battery rail in engine control units exposed to load-dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp positive/negative surges before reaching DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤214 V during 1500 W transients, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. | Use Scenario: RS-485/RS-232 data lines in factory automation PLCs subjected to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on differential signal pairs to shunt common-mode surges while preserving signal integrity. Use Value: Sub-1 µA leakage at 120 V stand-off avoids bias current errors; symmetric clamping maintains differential balance during transients. |
| Telecom AC/DC Power Input | Renewable Energy Inverter DC Link |
Use Scenario: Secondary-side DC bus in telecom power supplies facing lightning-induced surges on AC input lines. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor terminals to absorb coupled transients from primary-side isolation barriers. Use Value: 120 V VWM allows use after 110 VAC rectification; 214 V VC ensures MOSFETs and gate drivers remain within safe SOA limits. | Use Scenario: DC link between PV array and inverter stage in solar microinverters, subject to grid-switching transients. IC Role / Device Role / Timing Role: High-power TVS mounted directly across DC bus capacitors to suppress voltage spikes during IGBT commutation. Use Value: 1500 W PPK rating handles repetitive 1 ms surges; DO-214AB thermal resistance (RθJA = 55°C/W) enables stable operation at 75°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CA | 600 W PPK rating, SMA package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR range | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or sustained 1 ms surges | Select when board space is constrained and peak surge energy is ≤600 W |
| 1.5KE120CA | Through-hole DO-201 package, 1500 W PPK, but slower response (>1 ns), higher IR (≤5 µA @ 120 V) | Not AEC-Q101 qualified; incompatible with automated SMT assembly; requires wave soldering | Select only for legacy through-hole designs where rework flexibility outweighs automotive qualification needs |
Compared with SMAJ120CA and 1.5KE120CA, the SMCJ120CH delivers higher surge robustness in an AEC-Q101-qualified SMT package with faster response and lower leakage - making it the preferred choice for new automotive and industrial designs requiring ISO 7637-2 compliance and automated assembly.
Availability
SMCJ120CH is available at Aetrix Electronics and suitable for automotive power line protection, industrial I/O interface hardening, and telecom DC bus surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ120CH 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, MOSFETs, and power management devices.
The SMCJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in compact SMT packages.
FAQ
What is the clamping voltage of the SMCJ120CH under standard test conditions?
The SMCJ120CH has a maximum clamping voltage (VC) of 214 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 7.3 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ120CH maintains this clamping performance across its full operating temperature range, with derating applied per the published pulse derating curve in the datasheet.
Is the SMCJ120CH unidirectional or bidirectional, and how is polarity identified?
The SMCJ120CH is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities without requiring orientation during placement. Unlike unidirectional variants (e.g., SMCJ120H), the SMCJ120CH does not feature a cathode band marking. Its marking code "GHF" identifies it as the 120 V bidirectional variant in the SMCJ family, and its electrical characteristics apply identically in either direction.
Does the SMCJ120CH meet automotive qualification standards?
Yes, the SMCJ120CH is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and infotainment systems. It has passed stress tests for temperature cycling, humidity, mechanical shock, and high-acceleration life testing per the AEC-Q101 standard. This qualification, combined with ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, makes the SMCJ120CH appropriate for under-hood and chassis-mounted modules.
What is the maximum steady-state power dissipation for the SMCJ120CH?
The SMCJ120CH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value applies to continuous DC or low-frequency reverse-bias conditions and must be derated linearly above 25°C ambient using the specified thermal resistance (RθJA = 55°C/W). At 75°C ambient, the usable PD drops to approximately 2.7 W, limiting its use in sustained overvoltage scenarios - it is optimized for transient, not continuous, power handling.
How does the SMCJ120CH compare to the SMCJ120AH in terms of breakdown voltage tolerance?
The SMCJ120CH has a breakdown voltage (VBR) range of 133 V to 163 V at IT = 1 mA, while the SMCJ120AH specifies 133 V to 147 V. The wider tolerance of the SMCJ120CH reflects its bidirectional construction and tighter process control for symmetrical clamping. Both parts share identical VWM (120 V), VC (214 V / 193 V), and PPK (1500 W), but the SMCJ120CH's broader VBR window provides greater margin against false triggering in noisy environments.
SMCJ120CH 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:
- 214V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SMCJ120CH FAQ
1.How can I place an order for SMCJ120CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CH 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 SMCJ120CH reliable?
The price and inventory of SMCJ120CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CH is usually 5 days.
3.What payment methods are accepted for SMCJ120CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CH?
SMCJ120CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CH 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 SMCJ120CH?
For technical support, including SMCJ120CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CH requirements.
6.How does Aetrix verify that SMCJ120CH is sourced from the original manufacturer or authorized distributors?
All SMCJ120CH 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 SMCJ120CH meets industry standards.
7.What is the process for return or replacement of SMCJ120CH?
All SMCJ120CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CH, 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 SMCJ120CH part is unused and in its original packaging.
Return procedure for SMCJ120CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CH Tags
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