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Taiwan Semiconductor Corporation SMCJ70CH
- Part No.:
- SMCJ70CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CH.pdf
- Description:
- 1500W, 86.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,402
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Product details
Overview
SMCJ70CH 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-grade ESD and surge protection in power supply rails and data lines.
For engineers reviewing the SMCJ70CH datasheet, SMCJ70CH pinout, SMCJ70CH application, or SMCJ70CH equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and bidirectional clamping symmetry - critical for robust front-end protection in automotive ECUs and industrial controllers.
Technical Context
The SMCJ70CH 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.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting sustained operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - enabling direct placement in high-reliability automated assembly lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin below system rail voltage. |
| VBR min/max | 77.8 V / 95.1 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 125 V @ 12.6 A (10/1000 µs waveform) - Clamping voltage defines worst-case voltage seen by downstream ICs during surge events. |
| PPK | 1500 W - Peak pulse power rating determines survivability against standardized ISO 7637-2 transients. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| Response time | <1.0 ps - Enables suppression of ESD events before sensitive logic or analog circuitry is damaged. |
| TJ max | +150 °C - Junction temperature limit supports operation in under-hood automotive environments. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for unidirectional variants; SMCJ70CH is bidirectional and marked with "GGN" (per datasheet), featuring two symmetrical terminals with no polarity designation - both leads serve as identical surge-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Either terminal accepts positive or negative transients - eliminates orientation constraints during PCB placement. |
| Case (exposed metal slug) | Thermal conduction path | Integral heat-spreading surface improves thermal dissipation; requires copper pad area ≥ 40 mm² per JEDEC MO-214AC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test conditions including HTOL, TC, UHAST - required for ECU, ADAS, and body control modules. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without failure or parameter shift. |
| Glass-passivated junction | Enhances long-term reliability and stability under humidity, thermal cycling, and high-voltage stress versus epoxy-passivated alternatives. |
| Level 1 moisture sensitivity | Zero bake requirement prior to reflow - compatible with standard SMT assembly flow without dry-pack handling or floor-life restrictions. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports environmental compliance for global OEM programs and industrial certifications. |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed microcontroller power inputs in engine control units against load-dump transients (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Primary clamping element placed directly at power entry point, absorbing >95% of 1500W surge energy before it reaches LDOs or PMICs. Use Value: Limits voltage excursion to ≤125V during 35V/120ms load dump, preventing latch-up or permanent damage to 5V/3.3V logic supplies. |
Use Scenario: Safeguarding CANH/CANL differential pair in vehicle telematics modules exposed to ESD and coupled noise on chassis-grounded harnesses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CANH–CANL and from each line to ground, providing symmetrical clamping for ±15kV contact ESD (IEC 61000-4-2). Use Value: Maintains signal integrity by clamping transients within 1.0ps while adding <1pF junction capacitance - no CAN bit-rate degradation at 500 kbps. |
| Telecom DC Power Input | Factory Automation Sensor Interface |
Use Scenario: Securing -48V telecom rectifier outputs against lightning-induced surges entering central office equipment via outdoor cabling. IC Role / Device Role / Timing Role: Secondary-stage TVS deployed after primary MOV/GDT, handling residual fast-rising transients that bypass bulk suppression. Use Value: Delivers precise 125V clamping at 12.6A with <1µA leakage - avoids DC bias drift in precision monitoring circuits downstream. |
Use Scenario: Shielding 24V analog input channels (e.g., 4–20mA loops) in PLC I/O modules from inductive kickback caused by solenoid switching. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to connector, shunting surge energy before it couples into op-amp front-ends or ADC references. Use Value: Withstands 1000+ surge cycles at rated PPK without parameter drift - ensures long-term calibration stability in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70CA | Same DO-214AC (SMA) package, 1500W rating, but lower VC = 115V @ 13.9A; slightly higher IR = 5µA @ VWM. | Higher leakage may affect ultra-low-power sensor nodes; smaller package limits thermal mass for repetitive surges. | Prefer when board space is constrained and lower clamping voltage justifies trade-off in thermal endurance. |
| ON Semiconductor 1.5KE70CA | Through-hole DO-15 package, same 70V VWM and bidirectional function, but lower PPK = 1500W only at 25°C (derates faster above 75°C). | Not suitable for automated SMT lines; lacks AEC-Q101 and ISO 7637-2 validation. | Select only for legacy through-hole designs where rework cost outweighs performance gap. |
Compared with SMCJ70CH, SMAJ70CA offers tighter clamping but reduced thermal robustness in SMT layouts, while 1.5KE70CA sacrifices automotive qualification and surface-mount compatibility for legacy compatibility - making SMCJ70CH the optimal choice for new AEC-Q101-compliant SMT designs requiring full ISO 7637-2 coverage.
Availability
SMCJ70CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial CAN bus nodes, telecom DC power inputs, and factory automation sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMCJ70CH 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, and rectifiers - with over 30 years of automotive and industrial qualification experience.
The SMCJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing robustness against ISO 7637-2 pulses, low leakage, and high-temperature reliability up to +150°C junction.
FAQ
What does the "CH" suffix indicate in SMCJ70CH?
The "CH" suffix denotes a bidirectional configuration with symmetrical clamping characteristics in both polarities - unlike unidirectional "H" variants. SMCJ70CH has identical VBR, VC, and IPPM values for positive and negative transients, making it ideal for AC-coupled or floating signal lines such as CAN bus or Ethernet PHY interfaces.
Is SMCJ70CH compliant with AEC-Q101 and ISO 7637-2?
Yes, SMCJ70CH is fully AEC-Q101 qualified and tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. This dual certification confirms its suitability for automotive powertrain and body electronics where transient immunity is mission-critical - verified through accelerated stress testing including HTOL, temperature cycling, and surge waveform validation.
What is the maximum clamping voltage of SMCJ70CH and at what current is it specified?
The maximum clamping voltage (VC) of SMCJ70CH is 125 V, measured at a peak pulse current (IPPM) of 12.6 A using the standardized 10/1000 µs double-exponential waveform. This value represents the worst-case voltage imposed on protected circuitry during a full-rated 1500W transient event - a key parameter for ensuring downstream ICs remain within absolute maximum ratings.
How does SMCJ70CH differ from the "AH" variant (e.g., SMCJ70AH)?
SMCJ70CH is bidirectional, whereas SMCJ70AH is also bidirectional but belongs to the tighter-tolerance "A" version with narrower VBR range (77.8–86.0 V vs. 77.8–95.1 V for SMCJ70CH). Both share identical VWM (70 V), VC (113 V for AH, 125 V for CH), and PPK (1500 W), but SMCJ70AH offers improved consistency for designs requiring tighter clamping predictability across manufacturing lots.
What PCB layout considerations apply to SMCJ70CH in DO-214AB package?
For optimal thermal and electrical performance, SMCJ70CH requires symmetric copper pour on both terminals with ≥40 mm² total pad area connected to internal ground/power planes via multiple thermal vias. Keep traces short and wide (<2 mm length, ≥0.5 mm width) to minimize inductance, and avoid routing sensitive signals near the device - especially critical for ESD-sensitive analog or high-speed digital interfaces downstream.
SMCJ70CH 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:
- 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)
SMCJ70CH FAQ
1.How can I place an order for SMCJ70CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CH 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 SMCJ70CH reliable?
The price and inventory of SMCJ70CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CH is usually 5 days.
3.What payment methods are accepted for SMCJ70CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CH?
SMCJ70CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CH 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 SMCJ70CH?
For technical support, including SMCJ70CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CH requirements.
6.How does Aetrix verify that SMCJ70CH is sourced from the original manufacturer or authorized distributors?
All SMCJ70CH 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 SMCJ70CH meets industry standards.
7.What is the process for return or replacement of SMCJ70CH?
All SMCJ70CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CH, 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 SMCJ70CH part is unused and in its original packaging.
Return procedure for SMCJ70CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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