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Vishay General Semiconductor - Diodes Division SMCJ8.5CAHM3_A/I
- Part No.:
- SMCJ8.5CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,818
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Product details
Overview
SMCJ8.5CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features a 8.5 V stand-off voltage (VWM), 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ8.5CAHM3_A/I datasheet, SMCJ8.5CAHM3_A/I pinout, SMCJ8.5CAHM3_A/I application, or SMCJ8.5CAHM3_A/I equivalent, key selection criteria include bidirectional surge capability, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for board-level reliability under repetitive transient stress.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes before IC damage occurs.
The SMCJ8.5CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 9.44–10.4 V breakdown voltage range (VBR at IT = 1 mA) ensures stable triggering margin above VWM while maintaining tight tolerance for predictable clamping onset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse working voltage before clamping initiates; sets safe operating margin for 5 V–12 V signal/power rails. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | 14.4 V at 104.2 A - Clamped voltage during 1500 W transient; limits downstream IC stress to sub-15 V level. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; supports high-energy surges in automotive load-dump scenarios. |
| ID @ VWM | 20 μA - Reverse leakage at stand-off voltage; low enough to avoid signal integrity degradation in high-impedance sensor lines. |
| TJ max | +150 °C - Maximum junction temperature rating enabling use in under-hood automotive environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB copper pad sizing (0.31" × 0.31") for thermal derating above 25 °C. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Transient current exit (bidirectional) | Completes clamping path to ground or reference rail; symmetric with anode in CA-type devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential lines (e.g., RS-485, CAN FD) without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control and ADAS modules. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during surge events, reducing risk of gate oxide breakdown in downstream MOSFETs or transceivers. |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking; compatible with high-volume automated assembly lines. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance requirements for global OEM supply chains, including EU and China RoHS. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage clamping element placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤14.4 V, preventing ADC saturation and protecting 3.3 V/5 V input stages from latch-up. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers against field-wiring induced surges and EFT bursts. IC Role / Device Role / Timing Role: Primary surge suppression device on 24 V DC input terminals prior to optocoupler isolation stage. Use Value: Absorbs up to 1500 W transient energy without degradation, maintaining signal integrity during factory floor electrical noise events. |
| Automotive Body Control Module | Telecom Line Interface |
|
Use Scenario: Securing LIN bus communication lines in door modules and lighting control units subjected to battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN signal and ground to clamp both positive and negative excursions. Use Value: Symmetric 8.5 V VWM and 14.4 V VC ensure robust operation during ±100 V transients defined in ISO 16750-2. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI pairs) in network switches and base station equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on unshielded twisted-pair lines, coordinated with primary gas discharge tube (GDT) protection. Use Value: Fast <1 ns response captures residual energy after GDT crowbar action, limiting voltage seen by PHY to safe levels. |
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/I | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VC specs. | Suitable for space-constrained consumer electronics but not automotive under-hood due to lower power rating and thermal performance. | Select when board area is limited and surge energy is ≤400 W; verify thermal margin with reduced copper pad area. |
| SMCJ8.5CAHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant without halogen-free certification (E3 vs HM3 suffix). | Acceptable for commercial/industrial use where halogen-free requirement is not mandated by customer specification. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is unnecessary and halogen content is unrestricted. |
Compared with SMCJ8.5CAHM3_A/I, SMAJ8.5CAHE3_A/I trades surge capacity and thermal robustness for compact size, while SMCJ8.5CAHE3_A/I retains identical protection performance but lacks halogen-free compliance required by Tier 1 automotive OEMs.
Availability
SMCJ8.5CAHM3_A/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, telecom line interfaces, and sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SMCJ8.5CAHM3_A/I 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-power transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where failure resilience and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMCJ8.5CAHM3_A/I at its rated peak pulse current?
The SMCJ8.5CAHM3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 104.2 A using a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ8.5CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMCJ8.5CAHM3_A/I suitable for automotive applications?
Yes, SMCJ8.5CAHM3_A/I is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body control modules, and ADAS sensor interfaces. Its halogen-free, RoHS-compliant construction, MSL Level 1 rating, and guaranteed operation from -55 °C to +150 °C meet stringent OEM requirements. The SMCJ8.5CAHM3_A/I also complies with ISO 7637-2 and ISO 16750-2 transient immunity standards when applied per Vishay's recommended layout guidelines.
How does the bidirectional design of SMCJ8.5CAHM3_A/I affect its circuit placement?
The bidirectional design of SMCJ8.5CAHM3_A/I eliminates polarity constraints - it can be placed directly across any two nodes requiring symmetrical overvoltage protection, such as differential signal lines (CAN, RS-485) or AC-coupled paths. Unlike unidirectional TVS diodes, the SMCJ8.5CAHM3_A/I has no cathode band marking and functions identically regardless of orientation. This simplifies layout, reduces BOM count, and avoids assembly errors in high-mix manufacturing.
What is the thermal resistance of SMCJ8.5CAHM3_A/I and how does it impact PCB design?
The SMCJ8.5CAHM3_A/I 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 directly determines allowable power dissipation at elevated ambient temperatures - for example, at TA = 85 °C, derated power drops to ~4.3 W. To maintain reliability, PCB layout must replicate the specified pad dimensions and avoid thermal bottlenecks; the SMCJ8.5CAHM3_A/I is not intended for use on minimal copper areas.
Does SMCJ8.5CAHM3_A/I require external components to function as a standalone TVS solution?
No, the SMCJ8.5CAHM3_A/I operates as a standalone transient voltage suppressor and requires no external components to perform its clamping function. It is connected in parallel with the protected line and ground (or reference rail), relying on its intrinsic avalanche breakdown behavior. However, optimal performance depends on low-inductance PCB layout - short traces, direct ground plane connection, and avoidance of vias in the current path - all critical for preserving the SMCJ8.5CAHM3_A/I's sub-nanosecond response time.
SMCJ8.5CAHM3_A/I 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/I FAQ
1.How can I place an order for SMCJ8.5CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAHM3_A/I 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/I reliable?
The price and inventory of SMCJ8.5CAHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAHM3_A/I?
SMCJ8.5CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAHM3_A/I 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/I?
For technical support, including SMCJ8.5CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ8.5CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAHM3_A/I?
All SMCJ8.5CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMCJ8.5CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CAHM3_A/I Tags
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Diodes Incorporated
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