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Taiwan Semiconductor Corporation SMCJ70C
- Part No.:
- SMCJ70C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70C.pdf
- Description:
- 1500W, 86.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,872
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Product details
Overview
SMCJ70C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 70V working stand-off voltage (VWM), 77.8–95.1V breakdown voltage (VBR), and 125V maximum clamping voltage (VC) at 12.6A peak pulse current - designed for automotive ESD and load-dump protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ70C datasheet, SMCJ70C pinout, SMCJ70C application, or SMCJ70C equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage at 70V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ70C implements a glass-passivated silicon avalanche junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal paths, eliminating polarity dependency during layout.
It operates across –55°C to +150°C junction temperature range, supports 200A non-repetitive forward surge (IFSM), and maintains stable VBR (77.8–95.1V) with 1mA test current - meeting ANSI/IEEE C62.35 definitions for transient suppression devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC bias margin in protected circuit. |
| VBR min/max | 77.8 V / 95.1 V @ 1 mA - Validated avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 125 V @ 12.6 A - Clamped voltage during 10/1000μs surge; determines maximum stress on downstream ICs (e.g., transceivers, MCUs). |
| PPK | 1500 W - Peak pulse power handling per single 10/1000μs waveform; supports ISO 7637-2 Pulse 5a (load dump) immunity. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-backed or low-power systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal derating. |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case with matte tin-plated leads, UL 94V-0 flammability rating, JESD201 Class 2 whisker resistance, and polarity indicated by cathode band (not applicable for bidirectional SMCJ70C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry point (bidirectional) | Connects to line under protection; conducts surge current equally in either direction during overvoltage events. |
| Cathode (Lead 2) | Transient current return path (bidirectional) | Connects to reference plane (GND or VCC); completes low-inductance clamping loop with Anode during both polarities of transient. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485, CAN), or floating supplies without polarity concerns. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise) - critical for automotive ECUs. |
| Sub-1 ps response time | Clamps transients before they propagate beyond PCB trace length; protects high-speed interfaces (e.g., LIN, SENT) from ESD-induced latch-up. |
| Glass passivated junction | Ensures long-term reliability under humidity and thermal cycling; meets J-STD-020 Moisture Sensitivity Level 1 (unlimited floor life). |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for consumer, industrial, and automotive manufacturing with lead-free reflow. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: 12V battery rail in engine control units exposed to load dump (Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤125V, preventing damage to 40V-rated input MOSFETs and enabling robust operation per ISO 16750-2. | Use Scenario: High-noise CAN FD network in vehicle body electronics subjected to EFT and ESD coupling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair near connector. Use Value: Clamps common-mode surges to <125V while preserving signal integrity up to 5 Mbps due to low junction capacitance (~200 pF at 0 V). |
| Industrial Sensor Interface Protection | Smart Lighting Driver Input Stage |
Use Scenario: 4–20 mA analog sensor loop connected to PLC I/O module in factory automation. IC Role / Device Role / Timing Role: Line-to-ground TVS on each current-loop conductor, referenced to system ground. Use Value: Withstands 1 kV EFT bursts (IEC 61000-4-4) without degradation, maintaining loop accuracy and avoiding false triggers. | Use Scenario: Mains-connected LED driver subjected to lightning-induced surges on AC input rectifier output. IC Role / Device Role / Timing Role: Secondary-side TVS across bulk capacitor terminals to clamp switching spikes and surge residuals. Use Value: Absorbs 1500W pulses without failure, extending electrolytic capacitor lifetime and reducing need for oversized input filtering. |
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 DO-214AA package, 1000W PPK rating, 137V VC @ 10.2A; lower power handling than SMCJ70C's 1500W. | Preferred where board space is constrained (SMB vs SMC) but surge energy is moderate (e.g., consumer IoT). | Select SMBJ70CA only if layout area is limited and peak surge energy remains below 100 mJ. |
| 1.5KE70CA (ON Semiconductor) | Through-hole DO-15 package, 1500W PPK, 137V VC @ 10.2A; lacks ISO 7637-2 validation and higher RθJA (75°C/W). | Suitable for prototyping or legacy through-hole designs, not for automated SMT production or automotive qualification. | Choose 1.5KE70CA only for manual assembly or cost-sensitive non-automotive applications where surface-mount is not required. |
Compared with SMBJ70CA and 1.5KE70CA, the SMCJ70C delivers higher surge robustness (1500W), lower clamping voltage (125V vs ≥137V), and validated automotive compliance - making it the preferred choice for production-grade automotive and industrial SMT designs requiring guaranteed ISO 7637-2 immunity.
Availability
SMCJ70C is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and smart lighting driver development requiring stable component supply and full traceability.
Supply support for SMCJ70C 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, and power management components since 1979.
The SMCJ series was engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, high-temperature reliability, and automated SMT compatibility.
FAQ
What is the clamping voltage of the SMCJ70C under a standard 10/1000μs surge?
The SMCJ70C has a maximum clamping voltage (VC) of 125 V when subjected to a 10/1000μs surge waveform at 12.6 A peak pulse current (IPPM). This value is measured per Fig.5 in the official Taiwan Semiconductor datasheet (Version S2104) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ70C maintains this clamping performance consistently across its operating temperature range.
Is the SMCJ70C unidirectional or bidirectional, and how does that affect PCB layout?
The SMCJ70C is a bidirectional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping in both polarities, eliminating the need for orientation-specific placement. Unlike unidirectional variants (e.g., SMCJ70A), the SMCJ70C has no cathode band marking and can be mounted in either direction - simplifying layout and reducing assembly errors in differential or AC-coupled circuits.
Does the SMCJ70C meet automotive transient immunity standards such as ISO 7637-2?
Yes, the SMCJ70C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements per Taiwan Semiconductor's datasheet (Version S2104). Its 1500W peak power rating, fast response (<1 ps), and controlled clamping behavior enable reliable protection against inductive switching transients, battery disconnection spikes, and electrical fast transients - making it suitable for qualified automotive power modules and communication nodes.
What is the maximum junction temperature and thermal resistance of the SMCJ70C?
The SMCJ70C has a maximum junction temperature (TJ) of +150°C and a junction-to-ambient thermal resistance (RθJA) of 55°C/W in standard JEDEC PCB mounting conditions. Its junction-to-case resistance (RθJC) is 10°C/W, supporting effective heat transfer to copper pour or thermal pads. These values allow sustained operation in under-hood automotive environments and high-temperature industrial enclosures without active cooling.
How does the SMCJ70C compare to the SMCJ70A in terms of electrical performance?
The SMCJ70C is bidirectional with symmetrical VBR (77.8–95.1V) and VC (125V) in both directions, while the SMCJ70A is unidirectional and specifies VF = 5.0V at 100A forward current. The SMCJ70C exhibits identical VWM (70V), PPK (1500W), and IR (<1µA) but differs in polarity handling and marking - the "C" variant replaces the cathode band with symmetric terminal labeling, enabling use in AC or floating applications where polarity reversal may occur.
SMCJ70C 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70C FAQ
1.How can I place an order for SMCJ70C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70C 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 SMCJ70C reliable?
The price and inventory of SMCJ70C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70C is usually 5 days.
3.What payment methods are accepted for SMCJ70C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70C?
SMCJ70C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70C 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 SMCJ70C?
For technical support, including SMCJ70C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70C requirements.
6.How does Aetrix verify that SMCJ70C is sourced from the original manufacturer or authorized distributors?
All SMCJ70C 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 SMCJ70C meets industry standards.
7.What is the process for return or replacement of SMCJ70C?
All SMCJ70C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70C, 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 SMCJ70C part is unused and in its original packaging.
Return procedure for SMCJ70C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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