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STMicroelectronics SMCJ70CA-TR
- Part No.:
- SMCJ70CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CA-TR.pdf
- Description:
- TVS DIODE 70VWM 146VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:11,423
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Product details
Overview
SMCJ70CA-TR from STMicroelectronics is a bidirectional 1500 W transient voltage suppression diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 70 V standoff voltage (VRM), 113 V clamping voltage at 13.9 A (10/1000 µs), 0.2 µA leakage at 25 °C, and operates up to 150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMCJ70CA-TR datasheet, SMCJ70CA-TR pinout, SMCJ70CA-TR application, or SMCJ70CA-TR equivalent, key selection criteria include bidirectional clamping capability, low-leakage planar junction design, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and SMC package thermal robustness under repeated surge stress.
Technical Context
This TVS diode uses planar silicon junction technology optimized for stable clamping performance across -55 °C to +150 °C operating range. Its bidirectional configuration enables symmetric surge suppression on AC-coupled or floating lines without polarity constraints.
Clamping behavior follows defined dynamic resistance (RD = 1.94 Ω at 25 °C) and temperature coefficient (αT = 10.5 × 10⁻⁴ /°C), enabling accurate VCL prediction across junction temperatures using VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W (10/1000 µs); sustains repeated surges in industrial power input stages |
| Standoff Voltage (VRM) | 70 V; blocks normal operation voltage while triggering above system overvoltage threshold |
| Clamping Voltage (VCL) | 113 V at 13.9 A (10/1000 µs); limits downstream voltage stress during transients |
| Leakage Current | 0.2 µA at 25 °C; minimizes standby power loss in battery-backed or low-power systems |
| Junction Temperature Range | -55 °C to +150 °C; supports under-hood automotive and high-ambient industrial environments |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2); exceeds Level 4 immunity requirements |
| Surge Rating | 4 kV (IEC 61000-4-4 Level 4); protects against fast-rising electrical fast transients |
Pinout & Package
The SMCJ70CA-TR is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional structure means both terminals function identically under reverse or forward surge polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point (positive polarity) | Connects to protected line; forms symmetrical clamping path with Cathode |
| Cathode (K) | Surge current entry point (negative polarity) | Connects to protected line; enables bidirectional conduction during AC or floating transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity biasing |
| Low dynamic resistance | RD = 1.94 Ω ensures minimal voltage overshoot during high-current transients |
| High-temperature stability | Rated for continuous operation at Tj = 150 °C with derated power up to 1250 W |
| UL94 V0 epoxy housing | Meets flammability safety standard for enclosed industrial and automotive enclosures |
| JEDEC-compliant SMC footprint | Ensures mechanical compatibility with automated assembly and thermal pad layout per IPC-7531 |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry before DC-DC converter input. Use Value: Clamps 10/1000 µs surges to ≤113 V, preventing damage to upstream rectifier and downstream regulator ICs. | Use Scenario: CAN bus power line (VCC) in BCM units subjected to ESD events during service access. IC Role / Device Role / Timing Role: Bidirectional TVS on 12 V supply rail shared by multiple CAN transceivers and microcontrollers. Use Value: Absorbs ±30 kV contact discharge without latch-up, maintaining rail integrity during field maintenance. |
| Telecom DC Feeder Protection | Renewable Energy Inverter Control Board |
Use Scenario: 48 V DC power feed to remote radio units in outdoor base stations experiencing lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge clamp on telecom power interface, coordinated with upstream GDT and downstream polymer PTC. Use Value: Limits 8/20 µs surge voltage to <146 V at 69 A, preserving isolation barrier and monitoring circuitry. | Use Scenario: Auxiliary 24 V control supply in solar inverter main board, exposed to grid-switching transients. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated auxiliary rail feeding gate drivers and sensing ICs. Use Value: Maintains <0.2 µA leakage at 70 V, avoiding drift in precision analog feedback paths during long-term operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-TR | 600 W rating (vs. 1500 W); SMB package (smaller thermal mass) | Lower energy handling; suitable only for sub-100 A surge profiles | Select when space-constrained layouts preclude SMC footprint and surge threat level is ≤600 W |
| 1.5KE70CA | Through-hole DO-201 package; same 70 V VRM but higher VCL (118 V @ 12.1 A) | Lacks SMC's reflow compatibility and automated assembly support | Choose for legacy through-hole designs where board real estate allows larger footprint and manual assembly is acceptable |
Compared with SMBJ70CA-TR and 1.5KE70CA, the SMCJ70CA-TR delivers superior surge energy absorption in a surface-mount format with lower clamping voltage and tighter thermal management - critical for high-reliability industrial and automotive power interfaces.
Availability
SMCJ70CA-TR is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom DC feeder protection, and renewable energy inverter control boards requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SMCJ70CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The SMCJ series belongs to ST's high-power TVS diode product line, engineered specifically for robust electrostatic and surge protection in harsh-environment power electronics where reliability, low leakage, and thermal resilience are mandatory.
FAQ
What is the maximum clamping voltage of SMCJ70CA-TR under a 10/1000 µs surge?
The maximum clamping voltage is 113 V at 13.9 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate defined by αT = 10.5 × 10⁻⁴ /°C, reaching ~125 V at Tj = 150 °C.
Is SMCJ70CA-TR suitable for protecting CAN bus power lines?
Yes - its bidirectional architecture, ±30 kV ESD rating, and 70 V standoff make it appropriate for 12 V or 24 V CAN power rails. It must be placed close to the connector with low-inductance layout to ensure effective clamping before transients reach sensitive CAN transceivers.
How does the SMC package affect thermal performance compared to SMB?
The SMC package provides ~2.5× higher thermal mass than SMB, enabling sustained 1500 W pulse handling and better steady-state power dissipation. Its JEDEC-registered outline supports larger copper pads, reducing Rth(j-a) by up to 40% versus SMB when using recommended 3 cm² copper area per lead.
Does SMCJ70CA-TR require external biasing for bidirectional operation?
No - the device is inherently bidirectional due to symmetrical planar junction construction. It requires no external components or polarity-specific placement; both terminals connect directly to the protected line and ground reference, respectively, regardless of signal polarity or DC offset.
SMCJ70CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 146V
- Current - Peak Pulse (10/1000µs):
- 69A (8/20µs)
- 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:
- SMC (DO-214AB)
SMCJ70CA-TR FAQ
1.How can I place an order for SMCJ70CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CA-TR 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-TR reliable?
The price and inventory of SMCJ70CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CA-TR is usually 5 days.
3.What payment methods are accepted for SMCJ70CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CA-TR?
SMCJ70CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CA-TR 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-TR?
For technical support, including SMCJ70CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CA-TR requirements.
6.How does Aetrix verify that SMCJ70CA-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ70CA-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMCJ70CA-TR?
All SMCJ70CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CA-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMCJ70CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70CA-TR Tags
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