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Taiwan Semiconductor Corporation SMCJ12CH
- Part No.:
- SMCJ12CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CH.pdf
- Description:
- 1500W, 14.8V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,050
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Product details
Overview
SMCJ12CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR), and 22.0V maximum clamping voltage (VC) at 71A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the SMCJ12CH datasheet, SMCJ12CH pinout, SMCJ12CH application, or SMCJ12CH equivalent, this device serves as a robust, unidirectional/bidirectional surge protector for DC power rails and signal lines in automotive ECUs, industrial I/O modules, and telecom interface circuits where fast response (<1.0 ps), low leakage (<1 µA @ 12V), and high peak power handling are critical.
Technical Context
The SMCJ12CH uses a glass-passivated silicon junction to achieve stable breakdown behavior and low capacitance, enabling effective suppression of fast transients such as ESD (IEC 61000-4-2) and ISO 7637-2 pulses. Its bidirectional configuration allows symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, supporting reliable operation up to TJ = +150°C. The device sustains 200A non-repetitive forward surge (IFSM) and maintains <3.5V forward voltage only in unidirectional variants - not applicable to SMCJ12CH due to its CH suffix indicating bidirectional construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 16.3 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 22.0 V - Clamped voltage across device at 71 A peak pulse current; determines protected circuit's maximum overvoltage stress |
| PPK | 1500 W - Peak pulse power handling capability under 10/1000 µs waveform; defines surge energy absorption limit |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.210 g mass, UL 94V-0 molding, and matte tin-plated leads |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
SMCJ12CH is a two-terminal bidirectional TVS diode in DO-214AB (SMC) package. Polarity is not applicable; both terminals are symmetric and interchangeable. The cathode band marking is omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Provides low-impedance shunt path during overvoltage events in either polarity; no directional bias required |
| Case (cathode band absent) | Mechanical reference / thermal path | DO-214AB body serves as primary heat sink interface; no electrical connection to case |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating nodes (e.g., RS-485, CAN bus) without external polarity management |
| AEC-Q101 qualification | Validates suitability for under-hood automotive applications including engine control units and body electronics |
| ISO 7637-2 compliance | Guarantees immunity to real-world vehicle transients: Pulse 1 (inductive load dump), Pulse 2a/2b (switching spikes), Pulse 3a/3b (ignition noise) |
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift over temperature and lifetime |
| Fast response time | <1.0 ps rise-to-breakdown enables suppression of sub-nanosecond ESD events before downstream IC damage occurs |
Applications
| Automotive Power Rail Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed microcontroller power inputs in body control modules against load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed directly at power entry point to limit rail voltage to ≤22.0 V during ISO 7637-2 Pulse 1 (100 V, 40 ms). Use Value: Prevents brownout or latch-up in 3.3V/5V logic supplies by holding input voltage below LDO dropout and IC absolute maximum ratings. | Use Scenario: Shielding analog sensor inputs (e.g., 4–20 mA loop receivers) in programmable logic controllers from field-induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential input pins to clamp common-mode surges while preserving signal fidelity. Use Value: Maintains <1 µA leakage at 12V nominal, avoiding measurement offset errors in precision current-loop interfaces. |
| Telecom Line Interface Protection | Consumer Equipment ESD Hardening |
Use Scenario: Safeguarding Ethernet PHY magnetics or DSL line drivers exposed to lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: First-stage surge absorber mounted adjacent to connector, coordinated with GDT or MOV secondary protection. Use Value: Limits clamping voltage to 22.0 V at 71 A, ensuring downstream isolation transformers and PHY ICs remain within safe operating area. | Use Scenario: Adding IEC 61000-4-2 Level 4 (8 kV contact / 15 kV air) ESD protection to USB-C or HDMI hot-swap connectors in set-top boxes. IC Role / Device Role / Timing Role: Localized TVS on each signal line (CC, D+/D−, HPD) to divert ESD current before reaching controller pins. Use Value: Sub-1 ps response captures initial ESD arc energy before propagation, reducing risk of gate oxide rupture in USB transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Lower PPK (400 W), smaller SMA package, higher VC (26.5 V @ 12.5 A) | Not suitable for ISO 7637-2 Pulse 1; limited to lower-energy ESD and signal-line use | Select when board space is constrained and surge energy is ≤400 W |
| 1.5KE12CA | Higher PPK (1500 W), axial leaded DO-201 package, slower thermal response | Requires through-hole mounting; unsuitable for automated SMT assembly or high-density layouts | Select only for legacy through-hole designs or prototyping with breadboard compatibility |
Compared with SMAJ12CA and 1.5KE12CA, the SMCJ12CH delivers identical 1500 W surge rating in an SMT-optimized DO-214AB package with tighter VBR tolerance, lower clamping voltage, and AEC-Q101 qualification - making it the preferred choice for production automotive and industrial systems requiring automated assembly and validated reliability.
Availability
SMCJ12CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom line interface modules, and consumer equipment requiring stable component supply with full traceability and lifecycle support.
Supply support for SMCJ12CH 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 designed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where ISO 7637-2, IEC 61000-4-2, and AEC-Q101 compliance are mandatory.
FAQ
What does the "CH" suffix indicate in SMCJ12CH?
The "CH" suffix in SMCJ12CH denotes a bidirectional configuration with symmetrical clamping characteristics in both polarities. Unlike unidirectional variants (e.g., SMCJ12H), the SMCJ12CH has no cathode marking and is intended for AC-coupled or floating signal paths such as RS-485, CAN, or telecom line pairs. This eliminates the need for polarity-aware layout and enables simplified protection of differential interfaces.
Is SMCJ12CH suitable for protecting a 12V automotive power rail against load dump?
Yes, SMCJ12CH is explicitly designed for this use case. With a 12V working stand-off voltage (VWM), 22.0V clamping voltage at 71A, and AEC-Q101 qualification, it meets ISO 7637-2 Pulse 1 requirements for 12V systems. Its 1500W peak power rating ensures reliable suppression of 100V/40ms load dump transients without degradation, provided PCB layout includes low-inductance grounding and adequate copper pour for thermal dissipation.
How does SMCJ12CH differ from SMCJ12AH?
The SMCJ12CH and SMCJ12AH are both bidirectional 12V TVS diodes in DO-214AB packages, but SMCJ12AH has tighter VBR tolerance (13.3–14.7V vs. 13.3–16.3V) and lower clamping voltage (19.9V vs. 22.0V at 79A). SMCJ12CH offers broader VBR spread and slightly higher VC, making it more tolerant of process variation while maintaining full ISO 7637-2 compliance. Both share identical packaging, AEC-Q101 qualification, and thermal specs.
Can SMCJ12CH be used in place of a unidirectional TVS like SMCJ12H?
No - SMCJ12CH must not replace unidirectional SMCJ12H in DC-biased circuits without redesign. While both share VWM = 12V and similar PPK, the SMCJ12CH conducts in both directions and lacks a defined anode/cathode. Using it on a DC rail without reverse-blocking capability may cause unintended conduction or increased leakage. Always verify circuit topology: bidirectional use only for AC, floating, or differential signals.
What is the maximum operating temperature for SMCJ12CH?
The SMCJ12CH has a maximum junction temperature (TJ) of +150°C and a storage temperature range of −55°C to +150°C. Its RθJA = 55°C/W and RθJC = 10°C/W allow sustained operation at ambient temperatures up to +125°C in properly heatsinked layouts. Derating curves in the datasheet require power reduction above 25°C ambient - e.g., ~75% PPK at +85°C TA - to maintain safe junction temperatures.
SMCJ12CH 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 71A
- 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)
SMCJ12CH FAQ
1.How can I place an order for SMCJ12CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CH 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 SMCJ12CH reliable?
The price and inventory of SMCJ12CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CH is usually 5 days.
3.What payment methods are accepted for SMCJ12CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CH?
SMCJ12CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CH 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 SMCJ12CH?
For technical support, including SMCJ12CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CH requirements.
6.How does Aetrix verify that SMCJ12CH is sourced from the original manufacturer or authorized distributors?
All SMCJ12CH 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 SMCJ12CH meets industry standards.
7.What is the process for return or replacement of SMCJ12CH?
All SMCJ12CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CH, 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 SMCJ12CH part is unused and in its original packaging.
Return procedure for SMCJ12CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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