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Vishay General Semiconductor - Diodes Division SMCJ8.5CA-E3/57T
- Part No.:
- SMCJ8.5CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CA-E3/57T.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,736
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Product details
Overview
SMCJ8.5CA-E3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection on signal and power lines. 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 - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ8.5CA-E3/57T datasheet, SMCJ8.5CA-E3/57T pinout, SMCJ8.5CA-E3/57T application, or SMCJ8.5CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, DO-214AB thermal performance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ8.5CA-E3/57T is a glass-passivated, bidirectional TVS diode optimized for fast response (<1 ns) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its symmetrical breakdown behavior ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
It delivers 14.4 V clamping at 104.2 A peak pulse current under standardized 10/1000 μs waveform conditions, with low incremental surge resistance enabling stable voltage limiting during high-energy transients. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - guaranteed breakdown threshold defining turn-on precision |
| VC @ IPPM | 14.4 V at 104.2 A - clamped voltage during full 1500 W surge, critical for downstream IC survivability |
| PPPM | 1500 W - peak pulse power handling per 10/1000 μs waveform, defining surge energy capacity |
| TJ Range | -55 °C to +150 °C - extended thermal range supporting under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-power density |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads |
Pinout & Package
SMCJ8.5CA-E3/57T uses the SMC (DO-214AB) package: a molded, RoHS-compliant, low-profile surface-mount case with matte tin-plated leads solderable per J-STD-002. Bidirectional construction means no polarity marking; both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One side of symmetrical PN junction - accepts surge current during negative transients |
| Cathode | Transient current entry (positive polarity) | Other side of symmetrical PN junction - accepts surge current during positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded lines without polarity constraints |
| 1500 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with 8 mm² copper pads |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during transients, improving margin for 3.3 V/5 V logic and analog front-ends |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring stress-tested reliability |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector interface to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Maintains 14.4 V clamping under 104.2 A surge, ensuring downstream 5 V rail regulators and ADCs remain within safe operating limits. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring transients and ground bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, activated only during >8.5 V excursions to preserve normal operation. Use Value: Withstands repeated 1500 W surges while exhibiting <1 μA leakage at 8.5 V, minimizing false triggering and power loss. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pairs or between line and chassis ground to divert asymmetric transients. Use Value: Symmetrical 9.44–10.4 V breakdown ensures matched clamping in both directions, preserving signal integrity on full-duplex links. | Use Scenario: Adding secondary-level surge suppression on USB-C and barrel jack inputs of wall adapters after primary MOV stage. IC Role / Device Role / Timing Role: Fast-response secondary clamp limiting residual transients to <14.4 V before reaching rectifier and controller ICs. Use Value: 1 ns response time captures fast-rising ESD events missed by slower bulk protectors, improving system-level IEC 61000-4-2 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) and bidirectional configuration, but lower PPPM (600 W) and smaller SMA package | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge requirements are ≤600 W |
| SMCJ8.0CA-E3/57T | Lower VWM (8.0 V), tighter VBR range (8.89–9.83 V), identical package and 1500 W rating | Better suited for 3.3 V systems with tighter voltage margins; slightly earlier clamping onset | Choose for designs requiring lower standoff with same surge robustness |
Compared with SAC8.5CA and SMCJ8.0CA-E3/57T, the SMCJ8.5CA-E3/57T uniquely balances 8.5 V system compatibility, 1500 W surge headroom, and DO-214AB thermal performance - making it optimal for industrial and automotive applications demanding both voltage margin and energy handling.
Availability
SMCJ8.5CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter protection requiring stable component supply and long-term manufacturability.
Supply support for SMCJ8.5CA-E3/57T 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, MOSFETs, optoelectronics, and passive components 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 - targeting automotive, industrial control, and communications infrastructure where failure resilience is mission-critical.
FAQ
What is the clamping voltage of the SMCJ8.5CA-E3/57T under maximum rated surge current?
The SMCJ8.5CA-E3/57T clamps to 14.4 V when subjected to its maximum peak pulse current of 104.2 A under the standardized 10/1000 μs waveform. This value is measured at the device terminals with specified PCB layout (0.31″ × 0.31″ copper pads), and defines the upper voltage limit imposed on protected circuits during worst-case transients. The SMCJ8.5CA-E3/57T maintains this clamping performance across its full operating temperature range.
Is the SMCJ8.5CA-E3/57T suitable for automotive applications?
The SMCJ8.5CA-E3/57T itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3 and HM3 suffixes (e.g., SMCJ8.5CAHE3_A). These variants undergo stress testing per AEC-Q101 and are approved for automotive use in engine control, body electronics, and ADAS sensor interfaces. The SMCJ8.5CA-E3/57T shares identical electrical specs and package, enabling direct design-in migration to qualified versions.
How does the bidirectional configuration of the SMCJ8.5CA-E3/57T affect circuit layout?
The SMCJ8.5CA-E3/57T has no polarity marking and functions identically in both directions, simplifying layout for AC-coupled, differential, or floating signal paths - no orientation check is needed during placement. This eliminates risk of reverse installation and allows use across ungrounded lines like RS-485 buses or transformer-isolated interfaces. The SMCJ8.5CA-E3/57T achieves symmetrical clamping with matched VBR min/max in both polarities (9.44–10.4 V).
What is the thermal resistance of the SMCJ8.5CA-E3/57T, and how does it impact power dissipation?
The SMCJ8.5CA-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This value determines steady-state temperature rise under DC bias: at 6.5 W continuous dissipation, junction temperature rises ~488 °C above ambient - confirming that the device is intended for transient-only operation. The SMCJ8.5CA-E3/57T relies on short-duration surges rather than sustained power handling.
Can the SMCJ8.5CA-E3/57T replace a unidirectional TVS like SMCJ8.5A-E3/57T in an existing design?
No - the SMCJ8.5CA-E3/57T is bidirectional and lacks cathode marking, while the SMCJ8.5A-E3/57T is unidirectional with defined polarity. Substituting them requires verifying circuit topology: bidirectional devices are mandatory for AC or floating lines, whereas unidirectional types are used with DC-biased rails where polarity is fixed. The SMCJ8.5CA-E3/57T cannot be used as a drop-in replacement without confirming that reverse conduction is acceptable and that layout accommodates non-polarized mounting.
SMCJ8.5CA-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCJ8.5CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CA-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ8.5CA-E3/57T 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-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CA-E3/57T?
SMCJ8.5CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CA-E3/57T 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-E3/57T?
For technical support, including SMCJ8.5CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ8.5CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CA-E3/57T?
All SMCJ8.5CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ8.5CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CA-E3/57T Tags
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