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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHM3_A/I
- Part No.:
- SMBJ8.5CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,451
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Product details
Overview
SMBJ8.5CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power 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 41.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ8.5CAHM3_A/I datasheet, SMBJ8.5CAHM3_A/I pinout, SMBJ8.5CAHM3_A/I application, or SMBJ8.5CAHM3_A/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VWM ≈ 1.69), and AEC-Q101 qualification are required in space-constrained PCB layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for suppressing EFT and lightning-induced surges per IEC 61000-4-2/4-4/4-5.
The device is rated for 150 °C maximum junction temperature and exhibits a +0.073 %/°C temperature coefficient of VBR, supporting stable clamping performance across extended thermal ranges. Its MSL Level 1 rating and matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing margin for protected line. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Ensures reliable triggering above normal operating voltage while avoiding false clamping during transients. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage seen by downstream circuitry during 10/1000 µs surge; limits stress on 12 V-rated components. |
| PPPM | 600 W - Peak surge energy handling capability under standardized 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) compliance. |
| IPPM | 41.7 A - Peak surge current the device safely diverts without degradation; derived directly from PPPM and VC. |
| TJ max | 150 °C - Enables operation in under-hood automotive or high-ambient industrial environments without derating. |
| Package | SMB (DO-214AA) - 0.220" × 0.155" footprint with gull-wing leads; compatible with automated SMT placement and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable. Case meets UL 94 V-0 flammability rating; matte tin-plated leads ensure solderability per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically; connects across protected line (e.g., between signal and ground or differential pair) without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| 600 W peak pulse power | Handles high-energy transients such as ISO 7637-2 pulse 1/2a/5a without failure, supporting robust EMC design. |
| Clamping ratio VC/VWM = 1.69 | Minimizes overvoltage exposure to downstream ICs - e.g., keeps 12 V rail below 15 V during surge events. |
| MSL Level 1, 260 °C peak | Eliminates pre-baking requirement for standard SMT reflow, reducing manufacturing complexity and cost. |
| Halogen-free, RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-020; suitable for green electronics programs and export compliance. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role: Bidirectional clamping element placed across signal-to-ground or differential pair to shunt surge energy before it reaches sensitive analog front-ends. Use Value: Maintains signal integrity during ISO 16750-2 load dump tests (up to 120 V, 400 ms) while surviving repeated 15 kV ESD events per IEC 61000-4-2. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role: Parallel-connected TVS on each input channel to clamp induced spikes before they trigger false logic states or damage optocouplers. Use Value: Enables >100,000 surge cycles at 1 kV/42 Ω (IEC 61000-4-5) without parameter shift, ensuring long-term reliability in factory automation. |
| Consumer Audio Interface Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Shielding USB 2.0 D+/D− lines and audio codec I²S buses in smart speakers and soundbars from human-body-model ESD. IC Role / Device Role: Low-capacitance bidirectional TVS placed adjacent to connector to minimize stub length and preserve signal rise time. Use Value: Limits junction capacitance to <100 pF (typ.) at 0 V bias, preventing signal distortion while passing ±8 kV contact discharge per IEC 61000-4-2. |
Use Scenario: Front-end protection of Ethernet PHYs and xDSL line drivers exposed to lightning-induced surges on outdoor telecom wiring. IC Role / Device Role: First-stage clamping device in multi-stage protection network, absorbing bulk surge energy before gas discharge tube or MOV. Use Value: Withstands 10/1000 µs 6 kV surges (IEC 61000-4-5) at 2 Ω source impedance, reducing secondary stage stress and extending system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CAHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Approved for non-automotive industrial use where halogen-free mandate does not apply (e.g., consumer appliances). | Select when halogen-free compliance is not required and cost optimization is prioritized over green material specification. |
| SMAJ8.5CAHM3_A/I | Lower 400 W PPPM, higher VC (15.0 V), same VWM/VBR; SMA package (smaller footprint, lower thermal mass). | Suitable only for lower-energy threats (e.g., IEC 61000-4-2 ±8 kV, not Level 3 IEC 61000-4-5). | Choose for space-constrained designs accepting reduced surge margin, such as portable medical monitors or IoT edge nodes. |
Compared with SMBJ8.5CAHE3_A/I, the SMBJ8.5CAHM3_A/I adds halogen-free compliance for automotive and green procurement mandates; versus SMAJ8.5CAHM3_A/I, it delivers 50 % higher surge power handling and tighter clamping - critical for harsh environment deployment.
Availability
SMBJ8.5CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer audio interfaces, and telecom line cards requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMBJ8.5CAHM3_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 validation.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance under repetitive surge stress and extreme thermal conditions.
FAQ
What is the maximum clamping voltage of SMBJ8.5CAHM3_A/I under surge conditions?
The SMBJ8.5CAHM3_A/I has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current of 41.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience more than 14.4 V during standardized surge events - a key parameter for ensuring compatibility with 12 V logic and interface ICs. The SMBJ8.5CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5CAHM3_A/I suitable for automotive applications?
Yes, SMBJ8.5CAHM3_A/I is AEC-Q101 qualified, meaning it has passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per automotive-grade reliability standards. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating further support use in engine control units, body electronics, and ADAS sensor modules. The SMBJ8.5CAHM3_A/I is specifically designated for automotive use via the "HM3" suffix and revision code "_A/I".
How does the bidirectional configuration of SMBJ8.5CAHM3_A/I affect its circuit placement?
The SMBJ8.5CAHM3_A/I has no polarity marking and functions identically in both directions, allowing direct placement across any two nodes requiring symmetrical overvoltage protection - such as differential data lines (CAN, RS-485), AC-coupled signals, or power-to-ground rails. Unlike unidirectional TVS diodes, the SMBJ8.5CAHM3_A/I eliminates orientation errors during assembly and simplifies layout by removing the need for cathode alignment checks. Its symmetrical terminals are electrically interchangeable.
What is the thermal resistance of SMBJ8.5CAHM3_A/I, and how does it impact power dissipation?
The SMBJ8.5CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2" per terminal). This value determines steady-state temperature rise under DC power dissipation - for example, at its rated 5.0 W power dissipation, junction temperature rises ~500 °C above ambient, which is why the device is intended for transient-only duty (0.01 % duty cycle). The SMBJ8.5CAHM3_A/I relies on short-duration surge absorption rather than continuous power handling.
Does SMBJ8.5CAHM3_A/I meet international surge immunity standards?
Yes, the SMBJ8.5CAHM3_A/I supports compliance with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) when applied per recommended layout guidelines. Its 600 W peak pulse power rating corresponds to Level 3 (1 kV/2 Ω) and Level 4 (2 kV/2 Ω) surge testing per IEC 61000-4-5, and its sub-nanosecond response enables effective suppression of fast transients. The SMBJ8.5CAHM3_A/I is widely deployed in certified industrial and automotive end-equipment meeting these standards.
SMBJ8.5CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ8.5CAHM3_A/I FAQ
1.How can I place an order for SMBJ8.5CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHM3_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 SMBJ8.5CAHM3_A/I reliable?
The price and inventory of SMBJ8.5CAHM3_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 SMBJ8.5CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHM3_A/I?
SMBJ8.5CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHM3_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 SMBJ8.5CAHM3_A/I?
For technical support, including SMBJ8.5CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ8.5CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHM3_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 SMBJ8.5CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHM3_A/I?
All SMBJ8.5CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHM3_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 SMBJ8.5CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHM3_A/I Tags
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