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Taiwan Semiconductor Corporation SMCJ70CAH
- Part No.:
- SMCJ70CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CAH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,884
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Product details
Overview
SMCJ70CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount 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 113V maximum clamping voltage (VC) at 13.9A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients and ESD.
For engineers reviewing the SMCJ70CAH datasheet, SMCJ70CAH pinout, SMCJ70CAH application, or SMCJ70CAH equivalent, this device is selected for high-energy surge immunity in 12V/24V automotive subsystems, DC power input stages, and industrial I/O protection where AEC-Q101 qualification, <1.0ps response time, and ≤1μA reverse leakage above 10V are critical.
Technical Context
The SMCJ70CAH is a bipolar TVS diode configured as a single-die, symmetrical junction-enabling identical electrical characteristics in both directions. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its DO-214AB thermal design delivers RθJC = 10°C/W and RθJA = 55°C/W for reliable power dissipation under repetitive surge conditions.
It meets ISO 7637-2 test requirements for automotive load dump and switching transients without derating up to +125°C ambient, and supports fast transient suppression with sub-nanosecond response (<1.0ps rise time from 0V to VBR min) and clamping energy handling up to 1500W for 1ms pulses.
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 (e.g., 12V/24V nominal bus) |
| VBR @ IT=1mA | 77.8–86.0 V - Breakdown voltage range defining turn-on threshold; tight 10.5% tolerance enables predictable clamping onset |
| VC @ IPPM | 113 V - Clamped voltage at 13.9A peak pulse; limits downstream stress during ISO 7637-2 Pulse 2b (inductive switch-off) |
| PPK | 1500 W - Peak pulse power rating for 1ms 10/1000μs waveform; supports high-energy transient absorption without failure |
| IR @ VWM | <1 μA - Reverse leakage at 70V; negligible power loss and signal integrity impact in always-on protection circuits |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 0.210g mass, UL 94V-0 molding, and matte tin-plated leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic body with two coplanar gull-wing leads; cathode band omitted (bidirectional symmetry); polarity not applicable; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity marking required; connects across protected line and ground (or between differential lines) with identical clamping in either direction |
| Case (body) | Non-electrical mechanical interface | Thermally conductive but electrically isolated housing; contributes to RθJA = 55°C/W via PCB copper pour under pad |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness-enables use in engine control, ADAS, and body electronics |
| ISO 7637-2 compliance | Tested to Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling)-covers full automotive transient spectrum |
| Glass passivated junction | Stable VBR over lifetime and temperature; eliminates parameter drift due to humidity or bias stress in harsh environments |
| Fast response time | <1.0 ps rise time from 0 V to VBR min-clamps before sensitive ICs experience overstress during nanosecond-scale ESD events |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive-supports green manufacturing and end-of-life recycling requirements |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp surges before they reach LDOs, microcontrollers, and CAN transceivers. Use Value: Limits peak rail voltage to ≤113V during 13.9A transients-prevents latch-up and permanent damage to 3.3V/5V logic supplies downstream. | Use Scenario: 24V digital input modules receiving signals from field sensors and switches in factory automation. IC Role / Device Role / Timing Role: Line-to-ground TVS on each input channel to absorb inductive kickback and ESD from operator interaction. Use Value: Withstands ≥1000 surges at rated PPK without degradation-ensures long-term reliability in unattended 24/7 operation. |
| Telecom DC Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: -48V telecom rectifier outputs feeding base station radios and backhaul equipment. IC Role / Device Role / Timing Role: Bidirectional clamping device across output terminals to suppress lightning-induced surges and hot-swap transients. Use Value: 1500W peak power rating handles multi-kA induced currents per IEC 61000-4-5 Level 4-meets Telcordia GR-1089-CORE requirements. | Use Scenario: MPPT charge controllers interfacing solar panels (up to 100V OC) with 12V/24V battery banks. IC Role / Device Role / Timing Role: Overvoltage protector on PV input to prevent damage from panel string transients and grid coupling events. Use Value: 70V VWM provides 30% margin above 100V open-circuit panel voltage while maintaining low leakage-preserves efficiency in low-light conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA | 600W PPK rating; same VWM/VBR/VC but lower surge capacity; SMB package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer or low-energy industrial designs-not rated for ISO 7637-2 Pulse 5a | Select when board area is limited and peak surge energy is ≤600W; verify thermal margin with RθJA = 85°C/W |
| 1.5KE70CA | Through-hole DO-201 package; 1500W PPK; same VWM/VBR/VC; slower response (~1ns) and higher IR (≤5μA) | Used in legacy industrial power supplies where manual assembly or high-vibration mounting is required | Choose for through-hole compatibility or where leaded mechanical retention is mandatory; avoid in high-frequency ESD-sensitive circuits |
Compared with SMBJ70CA and 1.5KE70CA, the SMCJ70CAH delivers identical clamping performance in a surface-mount AEC-Q101-qualified package optimized for automated production, automotive thermal cycling, and ISO 7637-2 compliance-making it the preferred choice for new automotive and industrial designs requiring high-reliability surge immunity.
Availability
SMCJ70CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power systems, and renewable energy charge controllers requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ70CAH 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 is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial applications demanding high-energy surge immunity, low leakage, and robust thermal performance in compact SMD packages.
FAQ
What does the "CAH" suffix indicate in SMCJ70CAH?
The "CAH" suffix in SMCJ70CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and halogen-free construction (H). Unlike unidirectional variants (e.g., SMCJ70H), the SMCJ70CAH provides symmetrical clamping in both polarities-eliminating orientation concerns during placement and enabling use in AC-coupled or floating-line protection schemes without polarity marking.
How does SMCJ70CAH differ from SMCJ70AH?
The SMCJ70CAH is bidirectional, while SMCJ70AH is unidirectional. Both share identical VWM (70V), VBR (77.8–86.0V), and VC (113V), but SMCJ70AH has a cathode band and must be oriented correctly in-circuit. The SMCJ70CAH replaces SMCJ70AH in applications requiring polarity-agnostic protection-such as differential data lines or dual-rail supplies-without redesigning layout or assembly processes.
Is SMCJ70CAH suitable for ISO 16750-2 load dump protection?
No-SMCJ70CAH is rated for ISO 7637-2 Pulse 5a (load dump) only up to 12V systems. For 24V automotive load dump (ISO 16750-2, 120V/350ms), a higher VWM device such as SMCJ130CAH or dedicated load dump suppressor is required. The SMCJ70CAH's 70V VWM provides adequate margin for 12V nominal systems but insufficient headroom for 24V bus transients.
What is the maximum allowable PCB trace length when using SMCJ70CAH for ESD protection?
For optimal ESD performance, keep PCB traces from the protected node to the SMCJ70CAH anode/cathode terminals under 5 mm, and minimize loop area to <10 mm². Longer traces add inductance that degrades clamping response-especially critical for IEC 61000-4-2 contact discharge (8kV/15kV), where sub-nanosecond rise times demand low-inductance layout to maintain the SMCJ70CAH's <1.0ps intrinsic response.
Does SMCJ70CAH require derating at elevated ambient temperatures?
Yes-SMCJ70CAH's peak pulse power must be derated linearly above TA = 25°C per Figure 2 in the datasheet: at +85°C ambient, PPK drops to ~1050W (70% of rated 1500W); at +125°C, it falls to ~600W. Designers must verify worst-case transient energy (e.g., ISO 7637-2 Pulse 2b) remains within the derated PPK envelope and confirm junction temperature stays below +150°C using RθJA = 55°C/W and actual copper pour area.
SMCJ70CAH 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:
- 113V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- 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)
SMCJ70CAH FAQ
1.How can I place an order for SMCJ70CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CAH 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 SMCJ70CAH reliable?
The price and inventory of SMCJ70CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CAH is usually 5 days.
3.What payment methods are accepted for SMCJ70CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CAH?
SMCJ70CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CAH 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 SMCJ70CAH?
For technical support, including SMCJ70CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CAH requirements.
6.How does Aetrix verify that SMCJ70CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ70CAH 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 SMCJ70CAH meets industry standards.
7.What is the process for return or replacement of SMCJ70CAH?
All SMCJ70CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CAH, 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 SMCJ70CAH part is unused and in its original packaging.
Return procedure for SMCJ70CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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