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Vishay General Semiconductor - Diodes Division SMCJ8.5CA-M3/9AT
- Part No.:
- SMCJ8.5CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CA-M3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
SMCJ8.5CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 8.5 V standoff voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 μs), clamping voltage of 14.4 V at 104.2 A, and operates across –55 °C to +150 °C junction temperature range.
For engineers reviewing the SMCJ8.5CA-M3/9AT datasheet, SMCJ8.5CA-M3/9AT pinout, SMCJ8.5CA-M3/9AT application, or SMCJ8.5CA-M3/9AT equivalent, this device is selected for high-energy surge suppression in automotive sensor interfaces, industrial I/O lines, and telecom power rails where bidirectional clamping, low clamping ratio, and AEC-Q101-compliant variants are critical.
Technical Context
The SMCJ8.5CA-M3/9AT uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its bidirectional architecture enables symmetrical clamping in both polarities without external polarity management.
It delivers 1500 W peak pulse power handling with a low incremental surge resistance and thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads. The halogen-free, RoHS-compliant M3 suffix confirms compliance with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal integrity margin for protected lines. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 14.4 V at 104.2 A - Clamping voltage under full 1500 W surge; determines maximum stress imposed on downstream ICs during transients. |
| PPPM | 1500 W - Peak pulse power rating with 10/1000 μs waveform; defines energy-handling capability for IEC 61000-4-5 Level 4 compliance. |
| TJ Range | –55 °C to +150 °C - Extended junction temperature range supports under-hood automotive and industrial ambient conditions. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement and reflow. |
| Leakage @ VWM | 20 μA max - Low reverse leakage preserves signal integrity and battery life in always-on circuits. |
Pinout & Package
SMCJ8.5CA-M3/9AT is housed in an SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity event) | Accepts surge current during negative-going transients; forms one half of symmetrical clamping path. |
| Cathode | Transient current entry point (positive polarity event) | Accepts surge current during positive-going transients; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints or external diode pairing. |
| 1500 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to Level 4 (4 kV line-earth, 2 kV line-line) with appropriate PCB layout. |
| Halogen-free, RoHS-compliant (M3) | Fulfills environmental compliance requirements for automotive and industrial end equipment while maintaining JESD201 Class 2 whisker resistance. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics and reduces assembly risk. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing stress on protected MOSFET gates, microcontroller I/O, and analog front-ends. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in engine control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to clamp ±100 V transients within 1 ns. Use Value: Prevents latch-up or gate oxide damage in signal-conditioning op-amps and microcontroller ADC inputs during vehicle-level EMC testing. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or optocoupler input stage, operating continuously at 24 V DC. Use Value: Eliminates need for series resistors or additional filtering, enabling direct connection to ruggedized field wiring while meeting IEC 61000-4-4 EFT immunity. |
| Telecom Power Rail Protection | Consumer USB Port ESD Suppression |
|
Use Scenario: Guarding 48 V PoE-powered Ethernet switch ports against lightning-induced common-mode surges on data pairs and power lines. IC Role / Device Role / Timing Role: Secondary-level TVS on midspan injectors or PSE circuitry, coordinated with primary GDT or MOV stages. Use Value: Limits let-through voltage to <15 V during 10/1000 μs surges, preserving PHY IC integrity and maintaining IEEE 802.3af/at compliance. |
Use Scenario: Protecting USB 2.0 D+/D− lines and VBUS in portable docking stations from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp placed adjacent to USB connector, rated for ±15 kV contact discharge. Use Value: Maintains <0.5 pF typical junction capacitance (per Vishay curve Fig. 4), preventing signal integrity degradation at 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-M3 | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR specs. | Suitable for space-constrained consumer boards but insufficient for industrial 1500 W surge requirements. | Select when board area is limited and surge threat level is ≤IEC 61000-4-5 Level 2. |
| SMCJ8.5CA-E3/9AT | Identical electrical specs and package; differs only in RoHS compliance grade (E3 = standard RoHS, M3 = halogen-free RoHS). | No functional difference; chosen based on environmental compliance mandates (e.g., automotive OEM halogen-free requirements). | Choose SMCJ8.5CA-M3/9AT when halogen-free material declaration is contractually required. |
Compared with SMBJ8.5CA-M3 and SMCJ8.5CA-E3/9AT, the SMCJ8.5CA-M3/9AT uniquely combines 1500 W surge capacity, halogen-free construction, and DO-214AB mechanical robustness-making it the only option among the three qualified for AEC-Q101-compliant automotive powertrain modules and heavy-industrial 24/48 V control systems.
Availability
SMCJ8.5CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power rail protection requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMCJ8.5CA-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive powertrain, industrial automation, and infrastructure communications equipment.
FAQ
What is the clamping voltage of SMCJ8.5CA-M3/9AT under maximum surge current?
The SMCJ8.5CA-M3/9AT clamps to 14.4 V when subjected to its peak pulse current of 104.2 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet Document Number 88394, page 2. The low clamping voltage ensures downstream components like microcontrollers or signal transceivers remain within safe operating limits during surge events. SMCJ8.5CA-M3/9AT maintains this performance across its full operating temperature range.
Is SMCJ8.5CA-M3/9AT suitable for automotive applications?
Yes, SMCJ8.5CA-M3/9AT is halogen-free, RoHS-compliant, and qualifies for AEC-Q101 when ordered with HE3 or HM3 suffixes. While the M3/9AT variant itself is commercial-grade, its construction-glass-passivated junction, MSL Level 1 rating, and –55 °C to +150 °C operation-aligns with automotive subsystem requirements such as body control modules and sensor interfaces. For certified automotive use, specify SMCJ8.5CA-HM3_X; the SMCJ8.5CA-M3/9AT serves as the baseline commercial version with identical electrical specs.
How does the bidirectional design of SMCJ8.5CA-M3/9AT affect circuit layout?
The bidirectional design of SMCJ8.5CA-M3/9AT eliminates polarity marking and allows symmetric placement across differential or AC-coupled signal paths-no anode/cathode orientation is required. This simplifies PCB routing for applications like RS-485, CAN bus, or audio lines where voltage transients may swing positive or negative. Unlike unidirectional TVS diodes, SMCJ8.5CA-M3/9AT requires no series blocking diode or external biasing, reducing component count and layout complexity while maintaining full protection coverage.
What is the thermal resistance of SMCJ8.5CA-M3/9AT, and how does it impact derating?
SMCJ8.5CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value directly governs power derating above 25 °C ambient: for example, at 85 °C ambient, its 6.5 W steady-state power dissipation drops to ~3.9 W. Engineers must reference Figure 2 in Vishay's datasheet 88394 to apply precise derating curves. SMCJ8.5CA-M3/9AT's RθJL of 15 °C/W also supports localized heat sinking via thermal vias under the leads.
Can SMCJ8.5CA-M3/9AT be used in parallel for higher surge current handling?
No-SMCJ8.5CA-M3/9AT is not recommended for parallel operation due to parameter mismatch (VBR tolerance ±5 %, dynamic impedance variation), which causes uneven current sharing and potential thermal runaway. Vishay specifies single-device operation only. For higher surge ratings, select a higher-power variant (e.g., SMCJ15CA-M3) or cascade with upstream current-limiting elements. The SMCJ8.5CA-M3/9AT datasheet explicitly prohibits paralleling without external balancing networks, which are not practical for TVS diodes.
SMCJ8.5CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 104.2A
- 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:
- DO-214AB (SMC)
SMCJ8.5CA-M3/9AT FAQ
1.How can I place an order for SMCJ8.5CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CA-M3/9AT 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 SMCJ8.5CA-M3/9AT reliable?
The price and inventory of SMCJ8.5CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CA-M3/9AT?
SMCJ8.5CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CA-M3/9AT 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 SMCJ8.5CA-M3/9AT?
For technical support, including SMCJ8.5CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CA-M3/9AT 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 SMCJ8.5CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CA-M3/9AT?
All SMCJ8.5CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CA-M3/9AT, 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 SMCJ8.5CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CA-M3/9AT Tags
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