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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHM3_B/H
- Part No.:
- SMBJ8.5CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHM3_B/H.pdf
- Description:
- 600W,8.5V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
SMBJ8.5CAHM3_B/H 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 and power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤14.4 V at 41.7 A peak surge current - deployed in sensor interface protection for industrial automation systems.
For engineers reviewing the SMBJ8.5CAHM3_B/H datasheet, SMBJ8.5CAHM3_B/H pinout, SMBJ8.5CAHM3_B/H application, or SMBJ8.5CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC standards.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative polarity transients without polarity-sensitive placement. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance RθJA = 100 °C/W (on recommended pad layout) and RθJL = 20 °C/W. It meets UL 497B recognition (QVGQ2) and complies with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed minimum/maximum voltage where device enters avalanche breakdown; ensures predictable turn-on behavior. |
| VC (Clamping Voltage) | ≤14.4 V at IPPM = 41.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines safe IC voltage margin. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy absorption capability under standardized 10/1000 µs waveform; validates robustness against IEC 61000-4-5 surges. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Minimal standby current draw; preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables deployment in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.220" × 0.155" footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transient events; no fixed polarity required in PCB layout. |
| Terminal 2 | Anode / Cathode (bidirectional) | Complementary terminal completing the symmetrical clamping path; enables placement across differential or single-ended lines without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, encoder outputs) without external polarity management. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for body electronics and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment; supports green manufacturing and export regulations. |
| MSL Level 1 (260 °C peak) | Allows standard SMT reflow without baking or special handling; reduces production line complexity and avoids moisture-related popcorning failures. |
| UL 497B recognized (QVGQ2) | Confirms suitability for telecom and industrial surge protection applications requiring third-party safety certification for primary-side protectors. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory-floor PLC I/O modules exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor output and ground to clamp ±1 kV EFT bursts and 0.5 kV surge events per IEC 61000-4-4/4-5. Use Value: Maintains signal fidelity below 10 mV offset shift during transients and prevents ADC saturation or op-amp latch-up in downstream signal conditioning circuits. |
Use Scenario: Safeguarding LIN bus communication lines between door module ECUs and central body controller in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor installed at LIN transceiver input to absorb load dump spikes and ISO 7637-2 pulse 1/2a/3a transients. Use Value: Ensures uninterrupted LIN frame transmission during battery disconnection events and prevents transceiver latch-up or permanent damage under 100 V/50 ms pulses. |
| Consumer Appliance Motor Drive | Telecom Power Input Stage |
|
Use Scenario: Shielding microcontroller GPIOs connected to brushed DC motor feedback circuits in smart home appliances subject to commutation noise. IC Role / Device Role / Timing Role: Fast-response TVS mounted directly at MCU pin to limit induced spikes from motor brushes to <15 V, within absolute maximum ratings of 3.3 V/5 V I/O cells. Use Value: Eliminates firmware resets caused by transient-induced bit flips and extends MCU lifetime in high-noise appliance environments. |
Use Scenario: Front-end protection of 48 V DC power inputs in PoE-powered network switches and base station remote radio units. IC Role / Device Role / Timing Role: Primary-level TVS placed before DC-DC converter input to absorb lightning-induced surges up to 600 W without derating or thermal runaway. Use Value: Prevents catastrophic failure of upstream rectifiers and enables compliance with Telcordia GR-1089-CORE immunity requirements for central office equipment. |
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_B/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-AEC-Q101); no halogen-free assurance. | Lacks automotive qualification; not approved for under-hood or safety-critical vehicle subsystems. | Select when cost sensitivity outweighs AEC-Q101 requirement and halogen-free materials are not mandated. |
| SMAJ8.5CA | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC; SMA (DO-214AC) package with smaller footprint and higher thermal resistance (RθJA = 140 °C/W). | Insufficient surge margin for IEC 61000-4-5 Level 3/4; limited to lower-energy transients in space-constrained consumer designs. | Choose only if board area is critical and surge threat level is confirmed ≤400 W; verify thermal performance with actual layout. |
Compared with SMBJ8.5CAHE3_B/H, the SMBJ8.5CAHM3_B/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance or package compatibility; versus SMAJ8.5CA, it delivers 50 % higher surge power handling and superior thermal dissipation in identical PCB real estate.
Availability
SMBJ8.5CAHM3_B/H is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body electronics, telecom power input stages, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ8.5CAHM3_B/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ8.5CAHM3_B/H at its rated peak pulse current?
The SMBJ8.5CAHM3_B/H clamps to a maximum of 14.4 V when subjected to its specified peak pulse current of 41.7 A under the 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ8.5CAHM3_B/H maintains this clamping performance across its full operating temperature range and after repeated surge exposures.
Is SMBJ8.5CAHM3_B/H suitable for automotive applications?
Yes - the HM3 suffix confirms SMBJ8.5CAHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101 Rev D, making it appropriate for non-safety-critical automotive subsystems such as body control modules, lighting drivers, and sensor interfaces. The SMBJ8.5CAHM3_B/H is not intended for airbag or braking system use unless explicitly validated by the end customer.
How does the bidirectional design of SMBJ8.5CAHM3_B/H affect PCB layout?
The SMBJ8.5CAHM3_B/H has no polarity marking and functions identically in either orientation, simplifying PCB layout for differential or floating signal paths. Engineers can place the SMBJ8.5CAHM3_B/H across any two nodes requiring symmetrical overvoltage protection - such as LIN bus lines, RS-485 pairs, or AC-coupled audio traces - without verifying anode/cathode alignment. This eliminates orientation-dependent assembly errors and reduces bill-of-materials complexity versus unidirectional alternatives.
What is the maximum reverse leakage current for SMBJ8.5CAHM3_B/H at its stand-off voltage?
At its 8.5 V stand-off voltage (VWM), the SMBJ8.5CAHM3_B/H exhibits a maximum reverse leakage current of 1.0 µA at 25 °C, per the Electrical Characteristics table in Vishay document 88392. This low leakage ensures minimal impact on high-impedance sensor outputs or battery-powered circuits. The SMBJ8.5CAHM3_B/H leakage remains below 5 µA even at 125 °C junction temperature, supporting reliable operation in thermally demanding enclosures.
Does SMBJ8.5CAHM3_B/H require special handling during reflow soldering?
No - the SMBJ8.5CAHM3_B/H is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and the molding compound meets UL 94 V-0 flammability. The SMBJ8.5CAHM3_B/H can be processed using standard lead-free reflow profiles alongside other MSL Level 1 components without process modification.
SMBJ8.5CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- 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_B/H FAQ
1.How can I place an order for SMBJ8.5CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/H reliable?
The price and inventory of SMBJ8.5CAHM3_B/H 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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHM3_B/H?
SMBJ8.5CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/H?
For technical support, including SMBJ8.5CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ8.5CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHM3_B/H?
All SMBJ8.5CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHM3_B/H Tags
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