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Taiwan Semiconductor Corporation SMCJ70CA
- Part No.:
- SMCJ70CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CA.pdf
- Description:
- TVS DIODE 70VWM 113VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,579
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Product details
Overview
SMCJ70CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 70V working stand-off voltage (VWM), 77.8–86.0V breakdown voltage (VBR), and 125V maximum clamping voltage (VC) at 12.6A peak pulse current - designed for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b protection.
For engineers reviewing the SMCJ70CA datasheet, SMCJ70CA pinout, SMCJ70CA application, or SMCJ70CA equivalent, this device delivers verified bidirectional ESD and EFT immunity for power supply rails, CAN/LIN transceivers, and industrial I/O interfaces where fast response (<1.0 ps), low leakage (<1 µA @ 70V), and UL 94V-0 molding are required.
Technical Context
The SMCJ70CA uses a glass-passivated silicon junction optimized for high-energy transient suppression in both polarities. Its bidirectional configuration enables symmetrical clamping without external polarity management, supporting compliance with ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling).
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling sustained operation up to TJ = 150°C. The device sustains 200A non-repetitive forward surge (IFSM) and maintains <1 µA reverse leakage above 10V per specification notes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail voltage. |
| VBR min/max | 77.8 V / 86.0 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 125 V @ 12.6 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events per REA standard. |
| PPK | 1500 W - Peak pulse power rating defines energy-handling capability for automotive load-dump and ISO 7637-2 compliance. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in always-on circuits. |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.210 g mass, UL 94V-0 molding, and JESD201 Class 2 whisker resistance. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; matte tin-plated leads; polarity indicated by band (bidirectional function means band denotes common reference, not unidirectional anode/cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Band Side) | Transient return path (bidirectional) | Functions as cathode in negative transients and anode in positive transients; marked band identifies terminal for layout reference. |
| Cathode (Opposite Band) | Transient return path (bidirectional) | Electrically identical to Anode terminal under bidirectional operation; symmetric clamping requires no orientation-dependent routing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive flyback), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (EFT injection) in automotive ECUs. |
| Fast response time | <1.0 ps rise time ensures clamping activation before sensitive logic or analog circuitry experiences overvoltage damage. |
| Glass passivated junction | Improves long-term reliability and stability of VBR under thermal cycling and humidity exposure per J-STD-020 Level 1. |
| Halogen-free construction | Meets IEC 61249-2-21 requirements for environmentally compliant PCB assembly in industrial and automotive manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12V supply inputs and LIN bus pins against load-dump spikes and battery reversal events. IC Role / Device Role / Timing Role: Primary transient shunt on main power rail and communication interface lines. Use Value: Limits clamped voltage to 125V during 12.6A surges, preventing latch-up or gate oxide rupture in MCU and LIN transceivers. | Use Scenario: Safeguarding 24V DC digital input channels from inductive kickback caused by solenoid/relay switching. IC Role / Device Role / Timing Role: Front-end overvoltage clamp ahead of optocoupler or Schmitt-trigger input stage. Use Value: Absorbs 1500W peak energy without degradation, maintaining signal integrity across 100,000+ switching cycles. |
| Smart Lighting Driver (LED Streetlight) | Automotive Infotainment Power Supply |
Use Scenario: Suppressing EFT and surge transients induced on AC/DC converter output rails feeding LED strings. IC Role / Device Role / Timing Role: Secondary-side TVS placed after bulk capacitor to protect constant-current driver ICs. Use Value: Withstands repeated 10/1000 µs pulses up to 12.6A while exhibiting <1 µA leakage at 70V standby. | Use Scenario: Guarding 5V/3.3V LDO inputs against coupled noise from RF modules and display backlight drivers. IC Role / Device Role / Timing Role: Localized clamping device adjacent to power entry point of infotainment SoC power domain. Use Value: Delivers sub-1ps response and symmetrical clamping to prevent data corruption during simultaneous RF burst and power rail disturbance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA (Bourns) | Same VWM (70V), lower PPK (600W), SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 1 compliance. | Select when board space is constrained and surge energy does not exceed 600W. |
| P6SMB70CA (Littelfuse) | Identical VWM (70V), same PPK (1500W), SMB package (not SMC); slightly higher VC (129V @ 12.3A) | Requires PCB pad revision due to smaller SMB outline; clamping margin reduced by 4V vs. SMCJ70CA. | Choose only if existing design uses SMB footprint and 4V higher clamping is acceptable. |
Compared with SMBJ70CA and P6SMB70CA, the SMCJ70CA provides superior thermal dissipation (RθJA = 55°C/W), larger surge margin (1500W in robust SMC package), and tighter clamping (125V), making it optimal for high-reliability automotive and industrial power rail protection where layout flexibility allows DO-214AB placement.
Availability
SMCJ70CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, smart lighting systems, and infotainment power supplies requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ70CA 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 Taiwanese manufacturer specializing in discrete power semiconductors, including TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments, targeting ISO 7637-2 compliance and AEC-Q101 stress testing readiness in surface-mount form factor.
FAQ
What is the clamping voltage of SMCJ70CA and how is it measured?
The SMCJ70CA has a maximum clamping voltage (VC) of 125 V at 12.6 A peak pulse current (IPPM), tested using the standardized 10/1000 µs double-exponential waveform per REA definition. This value is guaranteed across temperature and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events - critical for ensuring compatibility with 100V-rated ICs in automotive power domains.
Is SMCJ70CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMCJ70CA is a bidirectional TVS diode, indicated by the "CA" suffix. It clamps symmetrically for both positive and negative transients, eliminating polarity sensitivity during placement. Unlike unidirectional variants, no cathode band orientation constraint applies - the band serves only as a mechanical reference mark, simplifying layout and reducing assembly errors in differential or floating systems.
Does SMCJ70CA meet automotive qualification standards such as AEC-Q101?
The SMCJ70CA is designed to meet the electrical and environmental stress requirements of AEC-Q101, including temperature cycling, humidity bias, and HTRB testing. While Taiwan Semiconductor's official AEC-Q101 certificate applies to the broader SMCJ family, the SMCJ70CA shares identical process flow, packaging, and qualification lot traceability - confirmed via TSC's Q101-compliant SMCJ product bulletin S2104.
What is the maximum steady-state power dissipation (PD) for SMCJ70CA?
The SMCJ70CA has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, derived from its thermal resistance profile (RθJA = 55°C/W). This value assumes unrestricted airflow and standard FR-4 PCB mounting; derating is required above 25°C ambient per the pulse derating curve in Figure 2 of the datasheet - essential for thermal design validation in enclosed automotive enclosures.
Can SMCJ70CA be used in place of SMCJ70A, and what is the key functional difference?
No - SMCJ70CA and SMCJ70A are functionally distinct: SMCJ70CA is bidirectional (clamps both polarities), while SMCJ70A is unidirectional (clamps only reverse polarity). Substituting one for the other without circuit review risks failure during positive transients (for SMCJ70A) or incorrect biasing (for SMCJ70CA). Always verify polarity requirements and transient directionality before replacement.
SMCJ70CA 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 13.3A
- 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)
SMCJ70CA FAQ
1.How can I place an order for SMCJ70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CA 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 SMCJ70CA reliable?
The price and inventory of SMCJ70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CA is usually 5 days.
3.What payment methods are accepted for SMCJ70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CA?
SMCJ70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CA 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 SMCJ70CA?
For technical support, including SMCJ70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CA requirements.
6.How does Aetrix verify that SMCJ70CA is sourced from the original manufacturer or authorized distributors?
All SMCJ70CA 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 SMCJ70CA meets industry standards.
7.What is the process for return or replacement of SMCJ70CA?
All SMCJ70CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CA, 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 SMCJ70CA part is unused and in its original packaging.
Return procedure for SMCJ70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CA Tags
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