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Vishay General Semiconductor - Diodes Division SMBJ8.5CA-M3/5B
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- Part No.:
- SMBJ8.5CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA-M3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,121
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Product details
Overview
SMBJ8.5CA-M3/5B 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 (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CA-M3/5B datasheet, SMBJ8.5CA-M3/5B pinout, SMBJ8.5CA-M3/5B application, or SMBJ8.5CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.69), halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), low incremental surge resistance, and fast response time (<1 ns).
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and is rated for repetitive 0.01% duty cycle pulses under standard test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage seen by protected circuit during 10/1000 µs transient; determines downstream stress level. |
| PPPM | 600 W - Peak transient energy absorption capacity under standardized 10/1000 µs waveform. |
| ID @ VWM | 20 µA max - Low leakage current preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Enables use in high-temperature industrial environments without derating concerns. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint, compatible with standard reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction | No functional distinction between terminals; either terminal serves as cathode or anode depending on transient polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports robust protection against IEC 61000-4-5 surge events up to Level 4 without degradation. |
| Clamping voltage VC = 14.4 V | Provides 69% clamping ratio (VC/VWM), minimizing overvoltage stress on 3.3 V or 5 V logic interfaces. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and telecom end-equipment without compromising reliability. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related defects or delamination. |
| Low leakage ID ≤ 20 µA at VWM | Preserves signal fidelity on high-impedance sensor lines and avoids false triggering in precision analog circuits. |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O lines from inductive kickback during relay or solenoid switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across MOSFET gate-source or MCU GPIO pins. Use Value: Limits transient voltage to ≤14.4 V, preventing latch-up or oxide breakdown in 3.3 V/5 V control ICs while surviving >100,000 surge cycles. |
Use Scenario: ESD and load-dump protection on LIN bus transceiver inputs and power supply rails. IC Role / Device Role / Timing Role: Primary TVS element on 12 V supply input and bidirectional data lines. Use Value: Withstands ISO 7637-2 Pulse 1 (–150 V, 50 ms) and Pulse 2a (–100 V, 100 ms) without failure due to 600 W peak power rating. |
| Telecom Power Supply Input | Consumer Sensor Interface |
Use Scenario: Surge protection on AC/DC adapter output rails feeding PoE-powered devices. IC Role / Device Role / Timing Role: Secondary-side clamping device downstream of DC-DC converters. Use Value: Clamps lightning-induced surges to <15 V, maintaining regulation integrity for 5 V/12 V system rails with minimal PCB area. |
Use Scenario: ESD protection for I²C/SPI lines connecting MEMS accelerometers or environmental sensors to host MCU. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 200 pF typical) bidirectional clamp on differential signal pairs. Use Value: Adds <15 V clamping without distorting 400 kHz I²C waveforms due to sub-nanosecond response and low leakage. |
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-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade designs where halogen-free certification is not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary. |
| SAC8.5CA | Same VWM/VBR/VC ratings but in smaller SOD-123FL package; lower PPPM (400 W) and higher thermal resistance. | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or high-repetition industrial surges. | Choose only for space-constrained consumer applications with verified <400 W surge exposure. |
Compared with SMBJ8.5CA-M3/5B, the E3 variant offers identical protection performance with relaxed material compliance, while SAC8.5CA trades size for reduced surge handling-making the M3/5B optimal for industrial-grade, halogen-free, high-energy transient suppression.
Availability
SMBJ8.5CA-M3/5B is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ8.5CA-M3/5B 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, power efficiency, and automotive-grade qualification.
The SMBJ series targets high-energy transient suppression in harsh environments, with design focus on industrial automation, automotive subsystems, and infrastructure equipment demanding AEC-Q101 readiness and robust surge immunity.
FAQ
What is the clamping voltage of SMBJ8.5CA-M3/5B at its rated peak pulse current?
The SMBJ8.5CA-M3/5B has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 41.7 A under the 10/1000 µs waveform condition. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by protected circuitry during standardized surge testing. The SMBJ8.5CA-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5CA-M3/5B suitable for automotive applications?
SMBJ8.5CA-M3/5B itself is commercial-grade (M3 suffix), not AEC-Q101 qualified. However, Vishay offers the functionally identical SMBJ8.5CA-HM3_B/I variant with AEC-Q101 qualification. For automotive body control modules or infotainment systems requiring automotive qualification, the HM3 version must be specified; the SMBJ8.5CA-M3/5B is intended for industrial and telecom applications where AEC-Q101 is not required.
What does the "CA" suffix indicate in SMBJ8.5CA-M3/5B?
The "CA" suffix in SMBJ8.5CA-M3/5B denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ8.5A), the CA version has no cathode band marking and functions identically regardless of terminal orientation-critical for protecting AC-coupled or differential signal paths where polarity is undefined.
How does the M3 suffix differ from E3 in SMBJ8.5CA-M3/5B?
The M3 suffix indicates halogen-free, RoHS-compliant construction using bromine-free flame retardants in the molding compound, whereas E3 uses RoHS-compliant materials that may contain halogens. Both meet RoHS Directive 2011/65/EU, but M3 satisfies stricter environmental mandates such as JEDEC JS709E and IPC-1752A for halogen-free content (<900 ppm Br, <900 ppm Cl). The SMBJ8.5CA-M3/5B is preferred for green-certified industrial equipment.
What PCB pad layout is recommended for SMBJ8.5CA-M3/5B to achieve rated power dissipation?
To achieve the full 600 W peak pulse power rating, SMBJ8.5CA-M3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's datasheet Figure 2 and thermal characterization. Smaller pads reduce heat spreading, causing premature thermal runaway during repetitive surges. The SMBJ8.5CA-M3/5B's RθJA of 100 °C/W assumes this layout; deviating requires derating per Fig. 2 in Document 88392.
SMBJ8.5CA-M3/5B 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-M3/5B FAQ
1.How can I place an order for SMBJ8.5CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ8.5CA-M3/5B 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-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA-M3/5B?
SMBJ8.5CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA-M3/5B 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-M3/5B?
For technical support, including SMBJ8.5CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ8.5CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA-M3/5B?
All SMBJ8.5CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA-M3/5B Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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