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STMicroelectronics SMA6J70CA-TR
- Part No.:
- SMA6J70CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J70CA-TR.pdf
- Description:
- TVS DIODE 70VWM 120VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:11,102
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Product details
Overview
SMA6J70CA-TR from STMicroelectronics is a bidirectional 600 W transient voltage suppression diode designed for ESD and surge protection in low-capacitance, high-reliability signal lines. It features a 70 V stand-off voltage (VRM), 110 V clamping voltage at 5.5 A (8/20 µs), 0.2 µA leakage at 25 °C, and operates up to 175 °C junction temperature - deployed in industrial I/O, automotive sensor interfaces, and USB 2.0 data lines.
For engineers reviewing the SMA6J70CA-TR datasheet, SMA6J70CA-TR pinout, SMA6J70CA-TR application, or SMA6J70CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low-leakage performance at elevated temperature, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and SMA package thermal robustness under repeated surge stress.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (2.22 Ω at 8/20 µs) across its operating temperature range. Its bidirectional configuration enables symmetrical clamping for AC-coupled or floating signal paths without polarity constraints.
The device meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 (±30 kV), with verified clamping performance up to 110 V at 5.5 A (10/1000 µs) and 146 V at 4.6 A (8/20 µs), enabling reliable protection of 3.3 V–24 V interface circuits against fast transients and electrostatic events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - maximum continuous reverse working voltage before conduction begins |
| Clamping Voltage (VCL) | 110 V at 5.5 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power | 600 W (10/1000 µs) - sustained surge energy handling on standard FR4 PCB footprint |
| Leakage Current | 0.2 µA at 25 °C - minimal DC loading on high-impedance analog or reference nodes |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive or industrial motor control enclosures |
| ESD Withstand | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 for human-body-model immunity |
| Dynamic Resistance | 2.22 Ω (8/20 µs) - determines voltage overshoot under fast-rising transients |
Pinout & Package
The SMA6J70CA-TR is housed in a JEDEC DO-214AC (SMA) surface-mount package with gull-wing leads, IPC-7531 compliant footprint, and matte tin-plated solderable terminations rated for 260 °C / 10 s reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode for CA) | Surge current return path | Bidirectional symmetry means both terminals serve as interchangeable surge conduction paths |
| Anode (Cathode for CA) | Surge current return path | No polarity distinction - terminals are functionally identical for transient clamping |
Key Features
| Feature | Design Value |
|---|---|
| Low leakage at high temperature | 1 µA max at 85 °C - preserves signal integrity in thermally stressed industrial sensors |
| High junction temperature rating | 175 °C max Tj - enables placement near heat sources without derating |
| UL94 V0 resin encapsulation | Flame-retardant housing - satisfies safety requirements for enclosed power supplies and control panels |
| JEDEC MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH - eliminates bake requirements prior to assembly |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters and RS-485 fieldbus nodes from lightning-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across differential pair or supply rail to limit transient overvoltage before it reaches receiver inputs. Use Value: 110 V clamping ensures downstream 3.3 V or 5 V receivers remain within absolute maximum ratings during 1 kV/µs transients. | Use Scenario: Shielding CAN_H/CAN_L lines in body control modules against load dump and ESD events in 12 V vehicle systems. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor mounted directly at connector entry point to shunt fast transients before propagation into PHY IC. Use Value: 2.22 Ω dynamic resistance minimizes clamping delay, preserving CAN bit timing integrity during 8/20 µs surges. |
| USB 2.0 Data Line Protection | Smart Meter Communication Port |
Use Scenario: Safeguarding D+ and D− lines of embedded USB host controllers against user-handling ESD in medical or test equipment. IC Role / Device Role / Timing Role: Dual-channel bidirectional TVS array (two SMA6J70CA-TR per port) placed adjacent to USB connector to absorb ±30 kV HBM events. Use Value: 0.2 µA leakage prevents DC offset drift in high-precision USB VBUS monitoring circuits. | Use Scenario: Securing optical or RS-485 communication ports in utility smart meters exposed to outdoor surge environments per IEC 61000-4-4. IC Role / Device Role / Timing Role: Standalone bidirectional protector installed between meter SoC UART pins and external interface connector. Use Value: 600 W (10/1000 µs) rating matches IEC 61000-4-5 severity level 3 surge test requirements for Class B meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA | Higher 600 W rating at same VRM but in larger SMB (DO-214AA) package; 1.5× higher thermal mass | Better suited for board areas with lower density or where PCB copper area is limited | Select when thermal dissipation margin is critical and board space permits larger footprint |
| P6SMB70CA | Same SMA footprint but lower 600 W rating; higher clamping voltage (115 V) and leakage (1 µA @ 25 °C) | Less effective for low-voltage logic protection due to higher VCL and reduced ESD margin | Acceptable only if cost sensitivity outweighs clamping precision and leakage requirements |
Compared with SMBJ70CA and P6SMB70CA, SMA6J70CA-TR delivers tighter clamping (110 V vs. ≥115 V), lower leakage (0.2 µA vs. ≥1 µA), and optimized thermal response in the compact SMA outline - making it preferred for space-constrained, high-reliability signal line protection.
Availability
SMA6J70CA-TR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus nodes, USB 2.0 data lines, and smart meter communication ports requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SMA6J70CA-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, analog ICs, and protection components for industrial, automotive, and consumer markets.
The SMA6J series belongs to ST's transient voltage suppressor product line, engineered specifically for high-energy, low-leakage ESD and surge protection in space-constrained, thermally demanding applications.
FAQ
What is the difference between SMA6J70CA-TR and SMA6J70A-TR?
The "CA" suffix denotes bidirectional configuration, meaning both terminals behave identically under positive or negative transients - ideal for AC-coupled or floating signal lines. The "A" version is unidirectional, conducting only when cathode is positive relative to anode, and requires correct polarity placement. Clamping voltages and surge ratings are matched per device type.
Does SMA6J70CA-TR require derating above 25 °C ambient?
Yes - while the device operates up to 175 °C junction temperature, its peak pulse power must be linearly derated above 25 °C ambient per Figure 3 in DS5142. At 85 °C ambient, maximum 10/1000 µs pulse power drops to ~450 W on standard FR4 with recommended copper area, due to reduced thermal gradient efficiency.
Can SMA6J70CA-TR protect a 3.3 V logic line?
No - its 70 V stand-off voltage is incompatible with 3.3 V rails. For 3.3 V interfaces, use lower VRM devices like SMA6J5.0CA-TR (5 V VRM) or SMA6J6.5CA-TR (6.5 V VRM). Selecting a TVS with VRM > 1.2× nominal supply voltage risks false triggering or insufficient margin against normal operating transients.
Is the SMA6J70CA-TR RoHS and REACH compliant?
Yes - SMA6J70CA-TR carries STMicroelectronics' ECOPACK2 environmental compliance certification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, halogen-free resin meets IEC 61249-2-21, and packaging complies with J-STD-020 MSL Level 1.
SMA6J70CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, 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:
- 120V
- Current - Peak Pulse (10/1000µs):
- 27A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J70CA-TR FAQ
1.How can I place an order for SMA6J70CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J70CA-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 SMA6J70CA-TR reliable?
The price and inventory of SMA6J70CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J70CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J70CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J70CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J70CA-TR?
SMA6J70CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J70CA-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 SMA6J70CA-TR?
For technical support, including SMA6J70CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J70CA-TR requirements.
6.How does Aetrix verify that SMA6J70CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J70CA-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 SMA6J70CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J70CA-TR?
All SMA6J70CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J70CA-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 SMA6J70CA-TR part is unused and in its original packaging.
Return procedure for SMA6J70CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J70CA-TR Tags
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Nexperia USA Inc.
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Diodes Incorporated
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