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STMicroelectronics SMA6J8.5CA-TR
- Part No.:
- SMA6J8.5CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J8.5CA-TR.pdf
- Description:
- TVS DIODE 8.5VWM 18.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
SMA6J8.5CA-TR from STMicroelectronics is a bidirectional 600 W transient voltage suppression (TVS) diode in SMA package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact discharge) and IEC 61000-4-4 surge immunity (4 kV level 4). It features 8.5 V standoff voltage (VRM), 13.3 V clamping voltage at 41.7 A (10/1000 µs), and operates up to 175 °C junction temperature. Used in USB port, industrial sensor interface, and automotive body control modules for robust overvoltage hardening.
For engineers reviewing the SMA6J8.5CA-TR datasheet, SMA6J8.5CA-TR pinout, SMA6J8.5CA-TR application, or SMA6J8.5CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<1 µA at 85 °C), JEDEC DO-214AC-compliant SMA footprint, and verified IEC 61000-4-2/4-4 compliance - critical for high-reliability signal line protection in harsh environments.
Technical Context
This bidirectional TVS diode employs planar silicon technology to achieve low leakage current (0.2 µA at 25 °C, 1 µA at 85 °C) and stable clamping performance across -55 °C to +175 °C operating junction temperature. Its symmetrical breakdown characteristic enables identical protection for both polarities of transient events.
The device delivers 600 W peak pulse power (10/1000 µs) with dynamic resistance of 0.070 Ω and clamps to 13.3 V at 41.7 A. It meets J-STD-020 MSL Level 1, UL94 V0 resin, and IPC7531-compliant footprint requirements - enabling direct integration into automated SMT assembly lines without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 8.5 V - Maximum continuous reverse working voltage before conduction begins; defines minimum system operating margin. |
| Clamping Voltage (VCL) | 13.3 V at 41.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; ensures downstream ICs remain within absolute max ratings. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability for common lightning-induced surges in industrial wiring. |
| Leakage Current (IRM) | 1 µA at 85 °C - Minimal DC loading on high-impedance signal paths (e.g., sensor inputs, analog front-ends). |
| Junction Temperature Range | -55 °C to +175 °C - Enables deployment in under-hood automotive, motor drive controls, and industrial enclosures without derating. |
| ESD Withstand (IEC 61000-4-2) | 30 kV contact & air discharge - Exceeds level 4 requirement; eliminates need for secondary ESD stages on exposed connectors. |
| Surge Immunity (IEC 61000-4-4) | 4 kV level 4 - Protects against fast transients from relay switching, inductive load dumps, and AC line coupling. |
Pinout & Package
Package: SMA (DO-214AC), JEDEC-registered outline with matte tin-plated leads, UL94 V0 epoxy molding compound, and IPC7531-compliant footprint (5.43 mm × 2.63 mm pad pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Transient current sink (bidirectional) | Both terminals function identically as symmetrical avalanche junctions; no polarity marking required for PCB layout. |
| Anode (A) | Transient current sink (bidirectional) | Identical to cathode; device conducts equally in either direction above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without polarity constraints. |
| Low dynamic resistance (RD) | 0.070 Ω - Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving protection fidelity. |
| High-temperature reliability | Rated to 175 °C TJ - Supports placement near heat sources (power MOSFETs, transformers) without thermal derating. |
| MSL Level 1 rating | No floor life limitation - Eliminates bake-out requirements prior to reflow, reducing manufacturing cost and cycle time. |
| UL94 V0 flammability | Self-extinguishing epoxy housing - Meets safety standards for enclosed industrial and medical equipment. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protection of 4–20 mA current-loop sensors connected to PLC analog inputs in factory automation cabinets exposed to cable-borne surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching precision ADC front-end. Use Value: Maintains <1 µA leakage at 85 °C ambient, preventing offset drift in 24-bit sigma-delta converters while surviving 4 kV IEC 61000-4-4 bursts. |
Use Scenario: ESD hardening of LIN bus lines connecting door modules, seat controllers, and lighting nodes in passenger vehicles. IC Role / Device Role / Timing Role: Primary ESD suppressor on LIN physical layer, mounted adjacent to connector to minimize trace inductance. Use Value: Withstands 30 kV contact discharge per IEC 61000-4-2 without degradation, ensuring >100,000 mating cycles of vehicle service life. |
| USB 2.0 Port Protection | RS-485 Transceiver Interface |
|
Use Scenario: Overvoltage protection for USB D+/D− lines on embedded host controllers in kiosks, medical devices, and point-of-sale terminals. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline between USB connector and transceiver IC to preserve signal integrity. Use Value: Clamps to ≤13.3 V within 1 ns of ESD event, preventing latch-up in USB PHY while adding <0.5 pF parasitic capacitance at 1 MHz. |
Use Scenario: Surge protection for differential RS-485 data lines in building automation networks running through shared conduits with AC power. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, absorbing induced common-mode transients. Use Value: Delivers 600 W (10/1000 µs) dissipation without thermal runaway, maintaining differential impedance match and minimizing bit error rate during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J8.5A-TR | Unidirectional version; lower leakage (0.2 µA at 25 °C) but requires correct polarity orientation. | Suitable only for DC-biased lines (e.g., power rails, single-ended logic) where polarity is fixed and known. | Select when protecting grounded signal paths with defined DC bias; avoid for AC-coupled or floating interfaces. |
| SMBJ8.5CA | Same electrical specs but SMB package (DO-214AA); 1.5× higher PPP (1000 W) and larger footprint (5.29 mm × 3.94 mm). | Better suited for high-energy surge zones (e.g., AC mains input, PoE injectors) where board space permits larger package. | Choose when system-level surge testing exceeds 600 W or thermal mass requirements demand lower junction-to-ambient RθJA. |
Compared with SMA6J8.5A-TR, the CA variant offers polarity-agnostic protection essential for differential buses; versus SMBJ8.5CA, it trades 400 W peak power for 30% smaller PCB area and compatibility with dense USB/RS-485 layouts.
Availability
SMA6J8.5CA-TR is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, USB 2.0 port protection, and RS-485 transceiver interface applications requiring stable component supply across extended product lifecycles.
Supply support for SMA6J8.5CA-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, delivering innovative solutions across automotive, industrial, and power management markets since 1987.
The SMA6J series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, high-temperature ESD and surge suppression in space-constrained industrial and automotive electronics.
FAQ
What is the maximum clamping voltage of SMA6J8.5CA-TR under a 10/1000 µs surge?
The maximum clamping voltage is 13.3 V at 41.7 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature per the αT coefficient (7.3 × 10−4/°C), reaching ~14.1 V at 125 °C junction temperature as confirmed in DS5142 Rev 11 Table 2.
Is SMA6J8.5CA-TR compatible with lead-free reflow soldering?
Yes - it supports ST's recommended Pb-free reflow profile with peak temperature of 240–245 °C for 60 seconds (max 90 s), compliant with IPC/JEDEC J-STD-020. The matte tin-plated leads and UL94 V0 epoxy meet RoHS and REACH requirements without voiding warranty.
How does the bidirectional design affect PCB layout compared to unidirectional TVS diodes?
Unlike unidirectional types, SMA6J8.5CA-TR has no anode/cathode distinction - both terminals behave identically. This eliminates polarity-checking during placement and allows symmetric routing on differential pairs (e.g., RS-485 A/B), reducing layout errors and enabling mirror-symmetric protection schemes.
Can SMA6J8.5CA-TR be used to protect a 5 V logic line?
No - its 8.5 V standoff voltage (VRM) exceeds typical 5 V rail tolerances; clamping begins only above ~9.4 V (VBR min). For 5 V systems, SMA6J5.0CA-TR (5.0 V VRM) is specified, as confirmed in Table 2 of DS5142 where VBR ranges from 5.0–5.74 V at 25 °C.
SMA6J8.5CA-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.4V
- Voltage - Clamping (Max) @ Ipp:
- 18.7V
- Current - Peak Pulse (10/1000µs):
- 205A (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)
SMA6J8.5CA-TR FAQ
1.How can I place an order for SMA6J8.5CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J8.5CA-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 SMA6J8.5CA-TR reliable?
The price and inventory of SMA6J8.5CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J8.5CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J8.5CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J8.5CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J8.5CA-TR?
SMA6J8.5CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J8.5CA-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 SMA6J8.5CA-TR?
For technical support, including SMA6J8.5CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J8.5CA-TR requirements.
6.How does Aetrix verify that SMA6J8.5CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J8.5CA-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 SMA6J8.5CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J8.5CA-TR?
All SMA6J8.5CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J8.5CA-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 SMA6J8.5CA-TR part is unused and in its original packaging.
Return procedure for SMA6J8.5CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J8.5CA-TR Tags
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