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Vishay General Semiconductor - Diodes Division SMCJ8.5CAHM3_A/H
- Part No.:
- SMCJ8.5CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAHM3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,039
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Product details
Overview
SMCJ8.5CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 8.5 V standoff voltage, 1500 W peak pulse power rating, and 14.4 V clamping voltage at 104.2 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ8.5CAHM3_A/H datasheet, SMCJ8.5CAHM3_A/H pinout, SMCJ8.5CAHM3_A/H application, or SMCJ8.5CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on standard PCB copper pad layouts.
Technical Context
This device operates as a voltage-clamped transient protector with symmetrical breakdown characteristics in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche behavior, low incremental surge resistance, and fast response time under 10/1000 μs waveform stress.
Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power dissipation while maintaining 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 |
|---|---|
| Standoff Voltage (VWM) | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 9.44–10.4 V at 1 mA - Confirmed symmetric avalanche threshold for bidirectional conduction |
| Clamping Voltage (VC) | 14.4 V at 104.2 A - Peak voltage seen by protected circuit during full-rated 10/1000 μs surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for transient suppression without failure |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75–8.13 mm length and 5.59–6.22 mm width |
| Temperature Range | −55 °C to +150 °C - Full operational range including automotive under-hood environments |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic systems per stress test requirements |
Pinout & Package
SMCJ8.5CAHM3_A/H uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two terminals and no polarity marking (bidirectional configuration). Dimensions are 7.75–8.13 mm in length, 5.59–6.22 mm in width, and 2.06–3.20 mm in height. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common node in bidirectional clamping | One of two symmetrical terminals-no fixed polarity; connects to protected line or ground reference |
| Cathode | Current exit point in forward bias; common node in bidirectional clamping | Second symmetrical terminal-identical electrical role to Anode; enables clamping in both voltage polarities |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| Glass-passivated junction | Ensures repeatable avalanche performance and long-term stability under repeated surge events |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow compatibility without dry-pack or baking requirements |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance for automotive and industrial end-equipment certifications |
Applications
| Automotive Sensor Signal Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of engine knock sensors exposed to load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to limit excursion beyond ±15 V. Use Value: Prevents damage to downstream ADC inputs and maintains signal integrity during 1500 W surge events per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding differential CAN_H/CAN_L lines in factory automation gateways subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to chassis ground, leveraging symmetrical clamping. Use Value: Maintains CAN signal eye diagram integrity by clamping transients to ≤14.4 V while preserving <1 ns response latency. |
| Telecom DSL Line Interface | Consumer Appliance Motor Driver Feedback |
Use Scenario: Shielding ADSL/VDSL line drivers from lightning-induced surges entering via twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary-level bidirectional suppressor placed between line transformer secondary and PHY IC input pins. Use Value: Absorbs up to 1500 W of induced energy without degradation, meeting ITU-T K.21 basic protection level. | Use Scenario: Securing hall-effect rotor position feedback signals in BLDC motor controllers inside washing machines. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS mounted directly at connector interface to suppress commutation spikes. Use Value: Eliminates false triggering of position decoding logic by limiting transient excursions to 14.4 V at 104.2 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CAHE3_A/H | Lower PPPM (400 W), smaller SMA package, same VWM and VC | Suitable only for lower-energy transients; not rated for automotive load-dump | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4 |
| SMCJ8.5CAHE3_A/H | Same electrical specs and SMC package, but RoHS-compliant without halogen-free certification | Acceptable for commercial/industrial use where halogen-free mandate does not apply | Choose when AEC-Q101 is unnecessary and halogen-free material compliance is not required |
Compared with SMCJ8.5CAHM3_A/H, SMAJ8.5CAHE3_A/H offers reduced surge handling in a smaller footprint, while SMCJ8.5CAHE3_A/H matches all critical ratings but lacks halogen-free validation-making the HM3 variant essential for strict automotive Tier-1 supply chain requirements.
Availability
SMCJ8.5CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, telecom line cards, and consumer appliance motor control systems requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ8.5CAHM3_A/H 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, precision, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-including automotive powertrain, industrial automation, and infrastructure communications equipment.
FAQ
What is the clamping voltage of SMCJ8.5CAHM3_A/H at its rated peak pulse current?
The clamping voltage of SMCJ8.5CAHM3_A/H is 14.4 V measured at 104.2 A peak pulse current under the standard 10/1000 μs waveform. This value defines the maximum voltage imposed on the protected circuit during full-rated surge events and is confirmed in the Vishay datasheet Document Number 88394, page 2, Electrical Characteristics table.
Is SMCJ8.5CAHM3_A/H suitable for automotive applications?
Yes, SMCJ8.5CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and AEC-Q101 validated construction. It meets requirements for engine control units, body electronics, and ADAS sensor interfaces per the Vishay ordering information table on page 3 of document 88394.
How does the bidirectional design of SMCJ8.5CAHM3_A/H affect its circuit implementation?
The bidirectional design of SMCJ8.5CAHM3_A/H eliminates polarity marking and allows direct placement across any two nodes subject to reversible overvoltage-such as differential signal pairs or AC-coupled lines. Unlike unidirectional TVS diodes, SMCJ8.5CAHM3_A/H conducts identically in both directions, simplifying layout and avoiding orientation errors during automated assembly.
What is the thermal resistance of SMCJ8.5CAHM3_A/H, and how does it impact PCB layout?
SMCJ8.5CAHM3_A/H 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 8.0 mm × 8.0 mm copper pads per terminal-so PCB layout must allocate adequate copper area to avoid thermal derating and ensure long-term reliability under repetitive surge conditions.
Does SMCJ8.5CAHM3_A/H have a defined polarity marking on the package?
No, SMCJ8.5CAHM3_A/H has no polarity marking on the SMC (DO-214AB) package because it is a bidirectional device. The Vishay datasheet explicitly states "no marking on bidirectional types" in the Mechanical Data section (page 1), confirming that both terminals are functionally identical and interchangeable in circuit placement.
SMCJ8.5CAHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5CAHM3_A/H FAQ
1.How can I place an order for SMCJ8.5CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAHM3_A/H 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 SMCJ8.5CAHM3_A/H reliable?
The price and inventory of SMCJ8.5CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAHM3_A/H?
SMCJ8.5CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAHM3_A/H 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 SMCJ8.5CAHM3_A/H?
For technical support, including SMCJ8.5CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ8.5CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAHM3_A/H 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 SMCJ8.5CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAHM3_A/H?
All SMCJ8.5CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAHM3_A/H, 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 SMCJ8.5CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ8.5CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CAHM3_A/H Tags
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