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Vishay General Semiconductor - Diodes Division SMBJ8.5CD-M3/H
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- Part No.:
- SMBJ8.5CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CD-M3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:362
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Product details
Overview
SMBJ8.5CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 8.5 V stand-off voltage (VWM), 9.57–10.3 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and 14.3 V clamping voltage (VC) at 15 A peak surge current - used to protect I/O lines and power rails in industrial sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SMBJ8.5CD-M3/H datasheet, SMBJ8.5CD-M3/H pinout, SMBJ8.5CD-M3/H application, or SMBJ8.5CD-M3/H equivalent, this page delivers verified electrical parameters, bidirectional polarity behavior, thermal derating curves, M3 halogen-free RoHS-compliant construction, and real-world clamping performance under standardized surge waveforms.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its 14.3 V clamping voltage at 15 A IPPM ensures robust overvoltage limiting during transient events while maintaining low leakage (<0.5 μA at 8.5 V).
The device uses silicon avalanche junction technology with tight ±3.5 % VBR tolerance, achieves 150 °C max junction temperature, and meets J-STD-020 MSL Level 1 for reflow compatibility up to 260 °C peak. Thermal resistance is 125 °C/W (junction-to-ambient, mounted on minimum pad layout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before significant conduction begins |
| VBR min/max | 9.57 V / 10.3 V at 1 mA - precise breakdown threshold defining turn-on consistency |
| VC @ IPPM | 14.3 V at 15 A - clamped voltage during 10/1000 μs surge, directly limiting downstream IC stress |
| PPPM | 600 W - peak transient energy absorption capability under standard waveform |
| ID @ VWM | <0.5 μA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | 150 °C - maximum allowable junction temperature for reliable long-term operation |
| RθJA | 125 °C/W - thermal resistance determines safe power dissipation limits on PCB pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no cathode band marking. Matte tin-plated terminals, halogen-free, RoHS-compliant, JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking; either end serves as anode or cathode depending on transient polarity |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and mechanical mounting; no thermal or electrical connection to die |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Ensures predictable, repeatable clamping onset across production lots and temperature ranges |
| 600 W peak pulse power (10/1000 μs) | Handles common lightning-induced and inductive-switching surges per IEC 61000-4-5 |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning or special handling |
| <0.5 μA ID at VWM | Minimizes standby power loss and avoids false triggering in battery-powered sensor nodes |
| UL 94 V-0 molding compound | Meets flammability requirements for enclosed industrial and telecom equipment |
Applications
| Industrial Sensor Interface Protection | RS-485/422 Data Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to motor drive noise and relay coil flyback in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS clamps both positive and negative transients on differential or single-ended outputs before they reach ADC input stages or isolation barriers. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs by limiting voltage excursions to ≤14.3 V during 15 A surges. | Use Scenario: Safeguarding RS-485 transceivers connected to long cable runs in building management systems subject to induced lightning surges. IC Role / Device Role / Timing Role: Placed across A/B bus lines and ground to clamp common-mode and differential transients without affecting signal integrity at up to 10 Mbps. Use Value: Maintains communication uptime by absorbing 600 W surges while adding <1 pF capacitance - negligible impact on rise/fall times. |
| USB Port ESD Protection | DC Power Rail Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 VBUS and D+/D− lines in embedded host controllers where primary protection resides upstream. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp shunting ESD strikes (IEC 61000-4-2 ±8 kV contact) away from USB PHY and controller pins. Use Value: Achieves sub-nanosecond response with <0.5 μA leakage, preserving USB enumeration timing and preventing false disconnects. | Use Scenario: Protecting 12 V DC input rails of PoE-powered access points and IP cameras against load dump and hot-swap transients. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbs short-duration, high-energy spikes before they propagate into DC-DC converters and LDOs. Use Value: Clamps 12 V rail to ≤14.3 V during 15 A surges, avoiding brownout resets and MOSFET gate oxide overstress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 (Vishay) | Same VWM/VBR/VC specs; differs only in packaging (tape-and-reel vs. bulk) and M3 suffix compliance (halogen-free/RoHS vs. standard) | No functional difference in circuit protection; selected when M3 environmental compliance is not required | Choose SMBJ8.5CD-M3/H when halogen-free, RoHS, and JESD201 Class 2 whisker resistance are mandatory for industrial certification. |
| P6SMB8.5CA (Littelfuse) | Identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V @ 15.5 A); same SMB package but slightly higher IPPM (15.5 A vs. 15 A) | Drop-in compatible in most layouts; minor clamping voltage variance (<0.1 V) has no system-level impact | Choose P6SMB8.5CA if dual-sourcing is needed and M3-specific qualifications are not enforced in procurement. |
Compared with SMBJ8.5CD-M3/H, SMBJ8.5CA-E3/52 offers identical protection performance but lacks M3 environmental compliance, while P6SMB8.5CA provides functionally equivalent clamping with marginally higher surge current rating - both serve as validated alternatives when supply chain flexibility or alternate qualification paths are required.
Availability
SMBJ8.5CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 data line protection, and DC power rail surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ8.5CD-M3/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and automotive/industrial qualification.
The SMBJ series is designed specifically for high-energy transient suppression in harsh environments - optimized for fast response, tight VBR tolerance, and robust surge handling in space-constrained surface-mount applications.
FAQ
What is the polarity configuration of SMBJ8.5CD-M3/H?
SMBJ8.5CD-M3/H is a bidirectional TVS diode, meaning it conducts symmetrically in both directions and has no cathode band marking. This allows it to protect AC-coupled signals, differential buses like RS-485, or floating sensor outputs without regard to voltage polarity - unlike unidirectional variants such as SMBJ8.5D.
Does SMBJ8.5CD-M3/H meet RoHS and halogen-free requirements?
Yes, SMBJ8.5CD-M3/H carries the M3 suffix, confirming it is halogen-free, RoHS-compliant, and qualified to JESD201 Class 2 for tin whisker resistance. It also meets UL 94 V-0 flammability standards and J-STD-020 MSL Level 1 for lead-free reflow up to 260 °C.
What is the maximum clamping voltage of SMBJ8.5CD-M3/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ8.5CD-M3/H is 14.3 V when subjected to a 10/1000 μs surge waveform at 15 A peak current (IPPM). This value is guaranteed per Vishay's datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMBJ8.5CD-M3/H be used in place of a unidirectional TVS like SMBJ8.5D?
No - SMBJ8.5CD-M3/H is bidirectional and lacks polarity marking, making it unsuitable as a direct replacement for unidirectional SMBJ8.5D in DC-biased circuits where reverse conduction must be blocked. Substitution requires verifying circuit topology supports symmetrical clamping and no steady-state reverse bias exceeds VWM.
What is the thermal resistance of SMBJ8.5CD-M3/H in standard PCB mounting?
SMBJ8.5CD-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet. This value governs power derating above 25 °C ambient and must be used to calculate safe operating area under sustained surge repetition.
SMBJ8.5CD-M3/H 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):
- 9.57V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 42.2A
- 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)
SMBJ8.5CD-M3/H FAQ
1.How can I place an order for SMBJ8.5CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CD-M3/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 SMBJ8.5CD-M3/H reliable?
The price and inventory of SMBJ8.5CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CD-M3/H?
SMBJ8.5CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CD-M3/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 SMBJ8.5CD-M3/H?
For technical support, including SMBJ8.5CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CD-M3/H requirements.
6.How does Aetrix verify that SMBJ8.5CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CD-M3/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 SMBJ8.5CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CD-M3/H?
All SMBJ8.5CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CD-M3/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 SMBJ8.5CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ8.5CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CD-M3/H Tags
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