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Vishay General Semiconductor - Diodes Division SMCJ8.5A-E3/9AT
- Part No.:
- SMCJ8.5A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5A-E3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ8.5A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 14.4 V maximum clamping voltage at 104.2 A surge current, 9.44–10.4 V breakdown voltage at 1 mA test current, and 8.5 V stand-off voltage - deployed in automotive sensor signal line protection.
For engineers reviewing the SMCJ8.5A-E3/9AT datasheet, SMCJ8.5A-E3/9AT pinout, SMCJ8.5A-E3/9AT application, or SMCJ8.5A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 1.0 μA max reverse leakage at 8.5 V, MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding to fast-rising transients (sub-nanosecond response) by transitioning from high-impedance to low-impedance state when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
Designed for 10/1000 μs waveform surge immunity, it delivers 1500 W peak pulse power dissipation with derating above 25 °C ambient, supported by thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 9.44–10.4 V at 1 mA - defines precise voltage threshold where clamping initiates under controlled test conditions |
| Stand-off Voltage VWM | 8.5 V - maximum continuous reverse working voltage before leakage exceeds 1.0 μA |
| Clamping Voltage VC | 14.4 V at 104.2 A IPPM - limits transient voltage seen by downstream ICs during 10/1000 μs surge |
| Peak Pulse Power PPPM | 1500 W - sustains single transient energy without failure per standardized waveform |
| Reverse Leakage ID | ≤1.0 μA at 8.5 V - ensures minimal power loss and signal integrity in standby mode |
| Junction Temperature Range | −55 to +150 °C - supports operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - surface-mount footprint compatible with automated assembly and 8.0 mm × 8.0 mm copper pad thermal layout |
Pinout & Package
SMCJ8.5A-E3/9AT uses the standard SMC (DO-214AB) package: molded plastic body with two leads, cathode identified by a band on the case. Leads are matte tin plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (unidirectional) | Connected to ground or lower-potential node; enables forward-biased operation only during positive surges |
| Cathode | Reverse-biased clamping terminal | Connected to protected line; conducts avalanche current when transient exceeds VBR, shunting energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts while maintaining thermal performance via 8.0 mm × 8.0 mm copper pads |
| Glass-passivated junction | Ensures repeatable, stable breakdown voltage and long-term reliability under repeated surge stress |
| Very fast response time | Sub-nanosecond turn-on minimizes overshoot on sensitive 3.3 V or 5 V logic and sensor interfaces |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking preconditioning |
| AEC-Q101 qualification path | HE3/HM3 variants support automotive applications requiring validated reliability for engine control and ADAS sensors |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground, absorbing 1500 W transients without affecting DC bias or signal fidelity. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers by limiting voltage to ≤14.4 V during ISO 7637-2 Pulse 1/2a events. | Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at connector entry point, conducting only during overvoltage events while remaining invisible to normal 24 V logic thresholds. Use Value: Maintains system uptime by eliminating false triggering and component replacement due to repetitive 1 kV/500 A surge exposure. |
| Consumer Power Adapter ESD | Telecom Line Interface Protection |
Use Scenario: Secondary-side transient suppression on USB-C PD and AC/DC adapter output rails exposed to user-handling ESD and cable coupling noise. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) unidirectional TVS providing robust 8 kV contact / 15 kV air ESD immunity per IEC 61000-4-2. Use Value: Eliminates need for additional RC filtering stages while preserving tight 5–20 V output regulation margins. | Use Scenario: Front-end protection of Ethernet PHYs and RS-485 transceivers in network switches and base station equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: High-power (1500 W) clamping device placed before isolation transformers or common-mode chokes to divert differential-mode transients. Use Value: Achieves ITU-T K.20/K.21 compliance for central office equipment without increasing board area or BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5A-E3/9AT | Same VWM (8.5 V) and VC (14.4 V), but lower PPPM (600 W); smaller SMA package | Lower surge handling suits consumer-grade USB ports, not automotive load dump | Select when space-constrained and surge energy is ≤600 W |
| SMCJ8.5CA-E3/9AT | Bidirectional variant with identical VBR range (9.44–10.4 V) and VC (14.4 V), same PPPM (1500 W) | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, audio) | Choose for symmetric transient protection where polarity reversal occurs |
Compared with SAC8.5A-E3/9AT, SMCJ8.5A-E3/9AT provides 2.5× higher surge power margin critical for automotive and industrial environments; versus SMCJ8.5CA-E3/9AT, it offers lower capacitance and avoids unnecessary bidirectional conduction in DC-biased circuits.
Availability
SMCJ8.5A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply across extended production lifecycles.
Supply support for SMCJ8.5A-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 is engineered for high-energy transient suppression in harsh environments, targeting design-in for automotive, industrial, and telecom infrastructure where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ8.5A-E3/9AT under rated surge conditions?
The SMCJ8.5A-E3/9AT has a maximum clamping voltage (VC) of 14.4 V when subjected to its peak pulse current (IPPM) of 104.2 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on specified 8.0 mm × 8.0 mm copper pads and ensures downstream components see no more than 14.4 V during transient events. The SMCJ8.5A-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ8.5A-E3/9AT RoHS-compliant and lead-free?
Yes, the SMCJ8.5A-E3/9AT carries the "E3" suffix, indicating full RoHS compliance and lead-free construction per EU Directive 2011/65/EU. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and it satisfies JESD 201 Class 2 whisker resistance requirements. The SMCJ8.5A-E3/9AT is also halogen-free and complies with Vishay's material categorization per doc?99912.
Does the SMCJ8.5A-E3/9AT have AEC-Q101 qualification?
The base SMCJ8.5A-E3/9AT is not AEC-Q101 qualified; however, Vishay offers the automotive-grade variant SMCJ8.5AHE3_A/I with identical electrical specs and full AEC-Q101 certification. That part uses the "HE3" suffix and is intended for automotive applications such as engine control units and ADAS sensors. The SMCJ8.5A-E3/9AT remains suitable for industrial and commercial designs where AEC-Q101 is not mandated.
What is the thermal resistance of the SMCJ8.5A-E3/9AT and how does it affect PCB layout?
The SMCJ8.5A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve rated power dissipation, the datasheet specifies mounting on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad size increases thermal impedance, derating both continuous power and surge capability - a critical consideration in compact SMCJ8.5A-E3/9AT implementations.
How does the SMCJ8.5A-E3/9AT differ from bidirectional versions like SMCJ8.5CA-E3/9AT?
The SMCJ8.5A-E3/9AT is unidirectional, with polarity marked by a cathode band and optimized for DC-biased lines where only negative-going transients require suppression. In contrast, SMCJ8.5CA-E3/9AT is bidirectional, offering symmetrical clamping for AC signals or floating lines - same VBR, VC, and PPPM, but no polarity marking and double the capacitance. Use SMCJ8.5A-E3/9AT for 5 V/12 V/24 V rail protection; choose SMCJ8.5CA-E3/9AT for RS-485 or audio paths.
SMCJ8.5A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ8.5A-E3/9AT FAQ
1.How can I place an order for SMCJ8.5A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5A-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 SMCJ8.5A-E3/9AT reliable?
The price and inventory of SMCJ8.5A-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 SMCJ8.5A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5A-E3/9AT?
SMCJ8.5A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5A-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 SMCJ8.5A-E3/9AT?
For technical support, including SMCJ8.5A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5A-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 SMCJ8.5A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5A-E3/9AT?
All SMCJ8.5A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5A-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 SMCJ8.5A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5A-E3/9AT Tags
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