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Vishay General Semiconductor - Diodes Division SMCJ8.5AHE3/9AT
- Part No.:
- SMCJ8.5AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHE3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,726
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Product details
Overview
SMCJ8.5AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal 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), and clamps to ≤14.4 V at 104.2 A peak surge current - used in automotive ECUs, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the SMCJ8.5AHE3/9AT datasheet, SMCJ8.5AHE3/9AT pinout, SMCJ8.5AHE3/9AT application, or SMCJ8.5AHE3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), junction temperature range (–55 to +150 °C), and real-world design implications for transient immunity in 12 V and 24 V systems.
Technical Context
The SMCJ8.5AHE3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to ESD and lightning-induced surges. Its low incremental surge resistance ensures stable clamping under high-current transients, while the MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
Designed for placement on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power with derating above 25 °C ambient. The cathode band marking enables unambiguous polarity identification during automated assembly - critical for correct orientation in DC-biased protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; matches nominal 12 V system rails with margin. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - defines guaranteed avalanche onset window; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤14.4 V at 104.2 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress below 15 V absolute max ratings. |
| PPPM | 1500 W - peak pulse power handling capability; sustains 104.2 A surge without failure when mounted per recommended pad layout. |
| ID @ VWM | ≤20 µA - reverse leakage at 8.5 V; negligible power loss and minimal impact on high-impedance sensor or bias networks. |
| TJ range | –55 °C to +150 °C - qualified for under-hood automotive and industrial environments; supports AEC-Q101 reliability requirements. |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient; informs board-level thermal design when derating power at elevated ambient temperatures. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode marked by single band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or return path; must be routed with low-inductance trace to maintain clamping speed. |
| Cathode | High-side connection; marked by band | Connected to protected line (e.g., 12 V rail or signal input); polarity reversal causes device failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in engine control, ADAS, and body modules without additional qualification. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12 V lines when properly laid out - eliminates need for cascaded protection stages. |
| Low clamping voltage (14.4 V) | Keeps protected ICs within safe operating area during transients - avoids latch-up or overvoltage damage in microcontrollers and CAN transceivers. |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles - supports high-yield automated assembly without moisture sensitivity concerns. |
| Glass passivated junction | Ensures long-term stability of breakdown characteristics and low leakage drift over temperature and lifetime - critical for field-reliability in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches LDOs, microcontrollers, and CAN FD transceivers. Use Value: Limits voltage excursion to ≤14.4 V during 100 A/100 ms load dump events - prevents brownout resets and silicon damage. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLCs from EFT and surge coupling. IC Role / Device Role / Timing Role: Low-capacitance (≈1000 pF) shunt clamp on 0–5 V or 4–20 mA signal lines exposed to motor drive noise. Use Value: Maintains signal integrity by clamping transients <1 ns, with leakage <20 µA preserving measurement accuracy. |
| DC-DC Converter Input Protection | Telecom Power Shelf Surge Suppression |
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices against induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Primary front-end TVS placed upstream of input filter capacitors and MOSFET switches. Use Value: Absorbs 1500 W surge energy without degradation, enabling compact 2-layer PCB designs with no heatsink required. | Use Scenario: Secondary-stage protection on 48 V telecom power distribution boards subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Standoff-rated (8.5 V) device used in series with higher-voltage TVS or GDT for coordinated staging. Use Value: Provides precise low-voltage clamping threshold to protect downstream DC-DC controllers and monitoring ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients (IEC 61000-4-2 ESD, not full load dump) | Select when space-constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ8.5CAHE3/9AT | Bidirectional variant; same VWM (8.5 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, audio) | Choose for bidirectional protection needs; not interchangeable in DC-biased circuits due to different conduction behavior. |
Compared with SMAJ8.5A-E3/61T, the SMCJ8.5AHE3/9AT delivers 3.75× higher surge power handling and superior thermal performance; versus SMCJ8.5CAHE3/9AT, it provides tighter clamping in DC applications but lacks reverse-polarity protection - making it optimal for grounded 12 V rail protection where unidirectional operation is sufficient and cost-sensitive.
Availability
SMCJ8.5AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial I/O module development, and telecom power shelf production requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ8.5AHE3/9AT 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 demanding environments - engineered specifically for automotive, industrial, and telecom infrastructure where robustness against load dump, EFT, and lightning surges is non-negotiable.
FAQ
What is the clamping voltage of the SMCJ8.5AHE3/9AT under a 10/1000 µs surge?
The SMCJ8.5AHE3/9AT 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 the device mounted on 8.0 mm × 8.0 mm copper pads per terminal - critical for achieving the specified 1500 W surge rating. Exceeding recommended layout reduces effective clamping performance.
Is the SMCJ8.5AHE3/9AT AEC-Q101 qualified?
Yes, the SMCJ8.5AHE3/9AT is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified versions. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating suitability for automotive powertrain and chassis applications where reliability is mission-critical.
What does the "9AT" suffix indicate in SMCJ8.5AHE3/9AT?
The "9AT" suffix in SMCJ8.5AHE3/9AT specifies the packaging format: 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This format supports high-volume automated pick-and-place assembly and is distinct from the "57T" (7-inch reel, 850 units) option - ensuring compatibility with standard SMT line feeders and inventory planning for production-scale builds.
Can the SMCJ8.5AHE3/9AT be used in bidirectional signal lines?
No, the SMCJ8.5AHE3/9AT is a unidirectional TVS diode and must not be used on bidirectional or AC-coupled lines. Its cathode band marks the high-side terminal; reverse polarity application will cause forward conduction and potential failure. For bidirectional protection, use the SMCJ8.5CAHE3/9AT variant - identical in all other respects except symmetrical breakdown in both directions.
What is the thermal resistance junction-to-ambient (RθJA) for the SMCJ8.5AHE3/9AT?
The SMCJ8.5AHE3/9AT has a typical RθJA of 75 °C/W when mounted per Vishay's recommended pad layout (0.31″ × 0.31″ copper pads per terminal). This value assumes still air convection and directly impacts power derating: at 70 °C ambient, maximum continuous power drops to ~3.3 W. Board-level copper area and airflow significantly influence actual thermal performance in end equipment.
SMCJ8.5AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ8.5AHE3/9AT FAQ
1.How can I place an order for SMCJ8.5AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHE3/9AT 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 SMCJ8.5AHE3/9AT reliable?
The price and inventory of SMCJ8.5AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHE3/9AT?
SMCJ8.5AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHE3/9AT 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 SMCJ8.5AHE3/9AT?
For technical support, including SMCJ8.5AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHE3/9AT 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 SMCJ8.5AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHE3/9AT?
All SMCJ8.5AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHE3/9AT, 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 SMCJ8.5AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHE3/9AT Tags
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