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Vishay General Semiconductor - Diodes Division SMBJ8.5CA-M3/52
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- Part No.:
- SMBJ8.5CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA-M3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,257
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Product details
Overview
SMBJ8.5CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CA-M3/52 datasheet, SMBJ8.5CA-M3/52 pinout, SMBJ8.5CA-M3/52 application, or SMBJ8.5CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under surge, halogen-free RoHS compliance (M3 suffix), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding VWM (8.5 V), it avalanches symmetrically in both directions to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while low incremental surge resistance minimizes voltage overshoot during high-current surges.
The SMBJ8.5CA-M3/52 is rated for repetitive 10/1000 µs pulses at 0.01% duty cycle, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It supports operating junction temperatures from –55 °C to +150 °C and meets UL 497B recognition (QVGQ2) for surge protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 41.7 A - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC-level stress limits. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability per 10/1000 µs waveform; enables robust protection against lightning-induced surges. |
| ID (Reverse Leakage) | 20 µA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.220" × 0.155" footprint; compatible with JEDEC MS-012AC and automated pick-and-place. |
| Construction | Halogen-free, RoHS-compliant (M3 suffix); meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 (peak reflow 260 °C). |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals allow either orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically; connects across protected line (e.g., data pair or supply rail) without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity constraints. |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance when combined with appropriate series impedance on 24 V industrial buses. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components - e.g., keeps 3.3 V or 5 V logic inputs within absolute maximum ratings during transients. |
| Fast response time (< 1 ns) | Activates before sensitive semiconductor junctions experience destructive overvoltage - critical for protecting high-speed interface ICs. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile use without baking; reduces manufacturing handling complexity and cost. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor switching noise and ESD in factory automation cabinets. IC Role / Device Role / Timing Role: Shunt TVS placed across signal line and ground to clamp induced spikes before they reach ADC input or microcontroller GPIO. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs and ARM Cortex-M0+ MCUs operating at 3.3 V, maintaining measurement integrity under 1 kV EFT bursts. |
Use Scenario: Safeguarding Ethernet PHY interface pins (MDI/MDIX) and PoE detection circuitry in network switches subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional clamping device installed at RJ45 connector entry point to divert common-mode transients before reaching magnetics and PHY IC. Use Value: Enables compliance with IEEE 802.3af/bt surge immunity requirements while preserving signal integrity up to 100 MHz due to low junction capacitance (~200 pF at 0 V). |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Suppressing inductive kickback from solenoid valves and relay coils in BCMs where 12 V supply rails feed multiple microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12 V main rail and local 5 V/3.3 V LDO outputs to absorb repetitive load-dump and ISO 7637-2 pulse 5a transients. Use Value: Maintains system uptime during cold-crank and jump-start conditions; halogen-free M3 construction satisfies automotive material compliance (e.g., GMW3172, Ford WSS-M99P9999-A1). |
Use Scenario: Shielding MCU I/O and gate driver inputs from commutation noise generated by BLDC motors in smart washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Localized TVS on motor control signal traces (e.g., PWM enable, direction, hall sensor feedback) routed near high-di/dt power stages. Use Value: Eliminates false triggering of interrupt pins and resets caused by sub-100 ns edge-induced coupling; supports operation up to 20 kHz PWM frequency without signal degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (E3 vs M3). | No difference in circuit performance; differs only in material compliance (halogen content). | Select E3 if halogen-free requirement is not mandated; M3 required for strict green electronics standards (e.g., IPC-1752A Class B). |
| SMCJ8.5CA-M3 | Higher 1500 W PPPM rating, larger SMC (DO-214AB) package, same VWM/VBR/VC specs. | Used where higher surge energy handling is needed (e.g., AC mains input stages); requires larger PCB area and different pad layout. | Choose SMCJ8.5CA-M3 only when 600 W is insufficient - e.g., for IEC 61000-4-5 Level 5 (6 kV) testing - and board space allows SMC footprint. |
Compared with SMBJ8.5CA-E3/52, the M3 variant adds halogen-free compliance without trade-offs in electrical performance; compared with SMCJ8.5CA-M3, the SMBJ8.5CA-M3/52 offers identical clamping behavior in a 30% smaller footprint, making it optimal for space-constrained signal-line protection.
Availability
SMBJ8.5CA-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor drive designs requiring stable component supply and long-term manufacturability.
Supply support for SMBJ8.5CA-M3/52 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, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in compact SMT layouts - targeting industrial, automotive, and communications systems where consistent clamping, low leakage, and automated assembly compatibility are essential.
FAQ
What is the maximum clamping voltage of SMBJ8.5CA-M3/52 under surge conditions?
The SMBJ8.5CA-M3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to 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 represents the highest voltage that will appear across the device during a standardized surge event - directly limiting stress on downstream components like microcontrollers or transceivers connected to the protected line.
Is SMBJ8.5CA-M3/52 suitable for bidirectional signal line protection such as RS-485 or CAN bus?
Yes, SMBJ8.5CA-M3/52 is explicitly designed for bidirectional applications, as indicated by the "CA" suffix. Its symmetrical breakdown characteristic ensures equal clamping in both polarities, making it ideal for protecting differential or AC-coupled interfaces like RS-485, CAN FD, and USB without polarity concerns. The device's low clamping ratio and sub-nanosecond response preserve signal fidelity while suppressing ESD and EFT events up to ±15 kV contact discharge.
Does SMBJ8.5CA-M3/52 meet automotive qualification standards?
The base SMBJ8.5CA-M3/52 is commercial-grade and not AEC-Q101 qualified; however, Vishay offers automotive variants under ordering codes such as SMBJ8.5CAHM3_X (halogen-free, AEC-Q101 qualified). For non-automotive industrial or telecom use, SMBJ8.5CA-M3/52 delivers full specification compliance including MSL Level 1, UL 497B recognition, and JESD201 Class 2 whisker resistance - satisfying most non-automotive reliability requirements.
How does the M3 suffix affect the environmental compliance of SMBJ8.5CA-M3/52?
The M3 suffix on SMBJ8.5CA-M3/52 indicates halogen-free, RoHS-compliant construction per IPC-1752A requirements, with bromine and chlorine content each below 900 ppm. This distinguishes it from the E3 variant (RoHS-compliant but not halogen-free) and supports compliance with stringent green electronics mandates in EU, Japan, and major OEM supply chains - without any impact on electrical performance, thermal rating, or package dimensions.
What is the recommended PCB pad layout for SMBJ8.5CA-M3/52 to achieve rated power dissipation?
To achieve the full 600 W peak pulse power rating and maintain thermal stability, SMBJ8.5CA-M3/52 must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay Document 88392. Smaller pads reduce heat spreading and cause premature thermal derating; use internal ground/power planes connected via multiple vias beneath pads to enhance thermal conduction and sustain repetitive surge capability per the 0.01% duty cycle specification.
SMBJ8.5CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ8.5CA-M3/52 FAQ
1.How can I place an order for SMBJ8.5CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA-M3/52 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 SMBJ8.5CA-M3/52 reliable?
The price and inventory of SMBJ8.5CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA-M3/52?
SMBJ8.5CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA-M3/52 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 SMBJ8.5CA-M3/52?
For technical support, including SMBJ8.5CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ8.5CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA-M3/52 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 SMBJ8.5CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA-M3/52?
All SMBJ8.5CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA-M3/52, 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 SMBJ8.5CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA-M3/52 Tags
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