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Vishay General Semiconductor - Diodes Division SMCJ8.5CA-E3/9AT
- Part No.:
- SMCJ8.5CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CA-E3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,692
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Product details
Overview
SMCJ8.5CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps to ≤14.4 V at 104.2 A peak surge current - used in automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMCJ8.5CA-E3/9AT datasheet, SMCJ8.5CA-E3/9AT pinout, SMCJ8.5CA-E3/9AT application, or SMCJ8.5CA-E3/9AT equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, JEDEC-compliant SMC package dimensions, thermal resistance (RθJA = 75 °C/W), and AEC-Q101-qualified alternatives for automotive-grade design-in.
Technical Context
The SMCJ8.5CA-E3/9AT operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges per IEC 61000-4-2/4-5.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads, it sustains 1500 W peak pulse power under standardized 10/1000 µs waveform, with derating above 25 °C ambient per Fig. 2 and junction temperature limit of 150 °C. No cathode/anode designation applies due to bidirectional construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - guaranteed avalanche initiation range for bidirectional conduction |
| VC @ IPPM | ≤14.4 V at 104.2 A - clamped voltage during full-rated 1500 W transient, defining protected circuit stress |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity under standard lightning surge waveform |
| ID @ VWM | ≤20 µA - leakage current at stand-off voltage, ensuring minimal standby power loss |
| TJ max | +150 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing for thermal management |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H), matte tin-plated leads, MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either terminal serves as anode or cathode depending on transient polarity; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse rating | Withstands high-energy transients from inductive switching or lightning surges per IEC 61000-4-5 Level 4 |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| AEC-Q101 qualified option | HE3/HM3 variants available for automotive applications requiring qualification per JESD22-A108 |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and position sensor signal lines from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS device placed between signal line and ground to clamp transients before reaching sensitive analog front-end or transceiver ICs. Use Value: Limits induced voltage to ≤14.4 V during 104.2 A surge, preventing damage to 5 V or 3.3 V rail-tied receivers while maintaining signal integrity. | Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring surges and electrostatic discharge. IC Role / Device Role / Timing Role: Standoff-clamping TVS connected across input terminals to shunt surge energy away from precision op-amps and ADCs. Use Value: Withstands repeated 1500 W transients without degradation, ensuring long-term reliability in factory-floor environments with frequent cable hot-plugging. |
| Telecom Line Card Surge Suppression | Consumer USB Port ESD Protection |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors against lightning-induced common-mode surges on twisted-pair cables. IC Role / Device Role / Timing Role: Bidirectional TVS mounted differential-to-ground to suppress mode-converted surges entering via RJ45 connectors. Use Value: Clamps within <1 ns to protect 100BASE-TX magnetics and PHY ICs rated for ≤16 V absolute maximum, meeting GR-1089-CORE requirements. | Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines (D+/D−) in set-top boxes and smart displays exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with data lines to divert ±15 kV contact ESD per IEC 61000-4-2 without signal distortion. Use Value: Maintains signal rise/fall times due to minimal junction capacitance (<100 pF at 0 V), preserving USB 2.0 eye diagram compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5CA | Same VWM (8.5 V), lower PPPM (600 W), smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 compliance | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 only |
| SMCJ8.5CAHM3/9AT | Identical electrical specs, halogen-free RoHS-compliant variant with AEC-Q101 qualification | Required for automotive production where halogen-free and automotive qualification are mandated | Choose for Tier 1 automotive programs needing documented AEC-Q101 test reports and material compliance |
Compared with SMCJ8.5CA-E3/9AT, SAC8.5CA trades surge robustness for compactness, while SMCJ8.5CAHM3/9AT adds halogen-free and automotive qualification without altering clamping performance - enabling direct substitution where compliance requirements align.
Availability
SMCJ8.5CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, telecom line cards, and consumer USB port protection requiring stable component supply and full 1500 W surge capability.
Supply support for SMCJ8.5CA-E3/9AT 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 targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom infrastructure where 1500 W surge immunity and AEC-Q101 compliance are critical design requirements.
FAQ
What is the clamping voltage of SMCJ8.5CA-E3/9AT at its rated peak pulse current?
The SMCJ8.5CA-E3/9AT clamps to a maximum of 14.4 V when subjected to its rated peak pulse current of 104.2 A (10/1000 µs waveform). This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCJ8.5CA-E3/9AT maintains this clamping performance across its operational temperature range.
Is SMCJ8.5CA-E3/9AT suitable for automotive applications?
Yes, the SMCJ8.5CA-E3/9AT meets commercial-grade specifications and is part of the AEC-Q101-qualified SMCJ family - though the specific E3/9AT suffix denotes RoHS-compliant commercial grade. For automotive production, the HE3 or HM3 suffix variants (e.g., SMCJ8.5CAHE3/9AT) must be selected to ensure full AEC-Q101 qualification and halogen-free compliance. The SMCJ8.5CA-E3/9AT itself is widely used in automotive prototyping and non-safety-critical subsystems.
How does the bidirectional nature of SMCJ8.5CA-E3/9AT affect PCB layout?
The SMCJ8.5CA-E3/9AT has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. PCB layout requires symmetric 8.0 mm × 8.0 mm copper pads per terminal for optimal thermal dissipation and surge current handling, with no need for cathode alignment checks. This simplifies automated assembly and reduces placement error risk compared to unidirectional TVS diodes. The SMCJ8.5CA-E3/9AT's DO-214AB footprint remains identical regardless of signal polarity.
What is the maximum leakage current of SMCJ8.5CA-E3/9AT at its stand-off voltage?
At its 8.5 V stand-off voltage (VWM), the SMCJ8.5CA-E3/9AT exhibits a maximum reverse leakage current (ID) of 20 µA at 25 °C. This low leakage ensures minimal power drain in always-on circuits and avoids false triggering in high-impedance sensing nodes. Leakage increases with temperature but remains below 100 µA up to 85 °C ambient, making the SMCJ8.5CA-E3/9AT suitable for battery-powered and precision analog applications.
Can SMCJ8.5CA-E3/9AT be used in place of a unidirectional TVS like SMCJ8.5A-E3/9AT?
No - the SMCJ8.5CA-E3/9AT is strictly bidirectional and lacks polarity marking, whereas SMCJ8.5A-E3/9AT is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC signals, floating references, or differential buses; unidirectional types are required for DC-biased rails where reverse conduction must be blocked. Using SMCJ8.5CA-E3/9AT in a unidirectional application may cause unintended conduction during normal operation. Always match device polarity to system grounding architecture.
SMCJ8.5CA-E3/9AT 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 (SMCJ)
SMCJ8.5CA-E3/9AT FAQ
1.How can I place an order for SMCJ8.5CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ8.5CA-E3/9AT 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-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CA-E3/9AT?
SMCJ8.5CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CA-E3/9AT 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-E3/9AT?
For technical support, including SMCJ8.5CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CA-E3/9AT?
All SMCJ8.5CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CA-E3/9AT Tags
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