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Vishay General Semiconductor - Diodes Division SMCJ8.5A-E3/57T
- Part No.:
- SMCJ8.5A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5A-E3/57T.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,370
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Product details
Overview
SMCJ8.5A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMCJ8.5A-E3/57T datasheet, SMCJ8.5A-E3/57T pinout, SMCJ8.5A-E3/57T application, or SMCJ8.5A-E3/57T equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ8.5A-E3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping action begins at VBR (9.44–10.4 V) and limits transient voltage to ≤14.4 V at rated IPPM, enabling protection of downstream ICs and MOSFETs against inductive switching spikes and ESD events.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with derated power dissipation above 25 °C ambient per Figure 2. The device meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker testing, confirming suitability for high-reliability commercial and automotive-grade assemblies when ordered with HE3 suffix.
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 IT = 1 mA - Ensures reliable turn-on within defined tolerance band |
| VC @ IPPM | 14.4 V at 104.2 A - Limits transient voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 1500 W - Peak power handling capability under standardized lightning-surge waveform |
| ID @ VWM | 20 µA max - Low leakage preserves signal integrity and minimizes standby power loss |
| RθJA | 75 °C/W - Thermal resistance defines required PCB copper area for safe power dissipation |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, clamps reverse transients |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts only during forward surge |
| Cathode | Clamping terminal | Marked by band; connected to protected line; avalanches into conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and improved reliability vs. epoxy-passivated alternatives |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1 compliance | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak |
| RoHS-compliant, commercial grade | E3 suffix confirms lead-free, halogen-free (per JEDEC J-STD-609), and UL 94 V-0 molding compound |
| Automated placement optimized | Standardized SMC footprint and tape-and-reel packaging (57T = 7" reel, 850 pcs) support high-volume SMT lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges exceeding 13.5 V. Use Value: Clamps 10/1000 µs transients to ≤14.4 V, preventing damage to 16 V-rated microcontrollers and CAN transceivers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted across signal and return, referenced to local ground plane. Use Value: Sub-ns response and 20 µA leakage preserve signal accuracy while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier and controller ICs from mains-borne surges. IC Role / Device Role / Timing Role: Placed across bulk capacitor input to absorb differential-mode line transients. Use Value: 1500 W PPPM rating handles 1.2/50 µs surges per IEC 61000-4-5 Level 3 without degradation. | Use Scenario: Protecting PoE-powered devices (e.g., IP cameras) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Unidirectional TVS on each DC pair, referenced to chassis ground. Use Value: 8.5 V VWM aligns with 48 V nominal system; 14.4 V VC ensures downstream DC-DC converters remain within absolute max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR/VC specs | Reduced surge margin; suitable only for lower-energy transients or space-constrained layouts | Select when board area is critical and surge threat level is ≤600 W |
| SMCJ8.5CA-E3/57T | Bidirectional variant; identical VWM/VBR/VC but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose for differential data lines (e.g., RS-485) or ungrounded sensor outputs |
Compared with SMBJ8.5A-E3/52T and SMCJ8.5CA-E3/57T, the SMCJ8.5A-E3/57T delivers full 1500 W surge capacity in a robust SMC package while maintaining unidirectional polarity-ideal for cost-sensitive, high-energy DC rail protection where bidirectional clamping is unnecessary.
Availability
SMCJ8.5A-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and consumer power adapter development requiring stable component supply and consistent surge performance.
Supply support for SMCJ8.5A-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where robust clamping, low leakage, and repeatable surge endurance are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ8.5A-E3/57T under a 10/1000 µs surge?
The SMCJ8.5A-E3/57T has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 104.2 A using the standard 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions (mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ8.5A-E3/57T maintains this clamping performance across its operational temperature range.
Is the SMCJ8.5A-E3/57T suitable for automotive applications?
The SMCJ8.5A-E3/57T is RoHS-compliant and qualified to MSL Level 1, making it suitable for commercial automotive subsystems such as body control modules and infotainment power supplies. However, for AEC-Q101 qualification, the automotive-grade variant SMCJ8.5AHE3_A/H must be selected-the base SMCJ8.5A-E3/57T itself is not AEC-Q101 certified. Engineers specifying the SMCJ8.5A-E3/57T for automotive use should verify system-level surge immunity requirements against its 1500 W PPPM rating and thermal derating curve.
How does the SMCJ8.5A-E3/57T differ from the SMCJ8.5CA-E3/57T?
The SMCJ8.5A-E3/57T is unidirectional, with polarity marked by a cathode band and clamping active only in reverse bias, whereas the SMCJ8.5CA-E3/57T is bidirectional and provides symmetrical clamping for both positive and negative transients. Both share identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V) values, but the CA version lacks polarity marking and is used where signal lines may experience voltage reversals-such as AC-coupled interfaces. The SMCJ8.5A-E3/57T remains optimal for DC power rails and grounded signal paths.
What is the thermal resistance of the SMCJ8.5A-E3/57T, and how does it affect PCB layout?
The SMCJ8.5A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). This value directly impacts safe power dissipation: at 25 °C ambient, the device can dissipate up to 6.5 W continuously, but derates linearly above that temperature. To maintain reliability under repeated surge conditions, designers must allocate sufficient copper area and consider thermal vias-especially when operating near TJ max of 150 °C. The SMCJ8.5A-E3/57T's RθJA assumes standard JEDEC test conditions and must be validated for actual board stack-up.
Does the SMCJ8.5A-E3/57T require special handling or moisture sensitivity precautions?
No special moisture sensitivity handling is required for the SMCJ8.5A-E3/57T: it is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/85 % RH and placed directly onto PCBs without baking or dry-packaging. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and the device passes JESD201 Class 2 whisker testing. These attributes make the SMCJ8.5A-E3/57T compatible with standard SMT assembly lines and eliminate moisture-related yield risks-unlike higher-MSL components that demand strict floor-life controls.
SMCJ8.5A-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:
- 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-E3/57T FAQ
1.How can I place an order for SMCJ8.5A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5A-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 SMCJ8.5A-E3/57T reliable?
The price and inventory of SMCJ8.5A-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 SMCJ8.5A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ8.5A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5A-E3/57T?
SMCJ8.5A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5A-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 SMCJ8.5A-E3/57T?
For technical support, including SMCJ8.5A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5A-E3/57T requirements.
6.How does Aetrix verify that SMCJ8.5A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5A-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 SMCJ8.5A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ8.5A-E3/57T?
All SMCJ8.5A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5A-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 SMCJ8.5A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ8.5A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5A-E3/57T Tags
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Diodes Incorporated
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