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Vishay General Semiconductor - Diodes Division SMBJ8.5CA-E3/5B
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- Part No.:
- SMBJ8.5CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
SMBJ8.5CA-E3/5B 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-E3/5B datasheet, SMBJ8.5CA-E3/5B pinout, SMBJ8.5CA-E3/5B application, or SMBJ8.5CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under surge, RoHS-compliant commercial-grade construction, and compatibility with automated SMT placement on PCBs requiring transient immunity per IEC 61000-4-2/4-4.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping performance under repetitive 10/1000 µs transients at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads - enabling reliable operation without heatsinking in most board-level protection roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Voltage at which device enters avalanche conduction; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 14.4 V at 41.7 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC-level overvoltage margining. |
| PPPM (Peak Pulse Power) | 600 W - Maximum transient energy absorption capability under standardized 10/1000 µs waveform; validates robustness against lightning/ESD surges. |
| ID (Reverse Leakage) | 20 µA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance interfaces. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in enclosed industrial enclosures or near heat sources. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; optimized for automated pick-and-place and IPC-compliant reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking; terminals interchangeable - enables single-component protection of AC-coupled or differential signal lines without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 level 3 (1 kV surge) protection on 24 V DC power rails without derating. |
| 14.4 V clamping at 41.7 A | Ensures protected 3.3 V or 5 V logic circuits remain below absolute maximum ratings during 8/20 µs surges via appropriate series impedance. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination risk. |
| Glass-passivated junction | Delivers stable VBR tolerance and low leakage over 10+ year field life in humid or thermally cycling environments. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JEDEC JESD201 Class 2 whisker resistance - suitable for global commercial production. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver inputs against inductive kickback from relay coils and solenoid switching. IC Role / Device Role: Bidirectional clamping element placed across driver enable line and ground. Use Value: Limits transient excursions to ≤14.4 V, preventing latch-up or oxide damage in 5 V CMOS interface ICs under 100 V/µs edge rates. |
Use Scenario: ESD and load-dump suppression on LIN bus physical layer traces between microcontroller and transceiver. IC Role / Device Role: Primary TVS on bidirectional LIN signal line (VPIN/LIN) referenced to battery ground. Use Value: Clamps ±30 kV contact ESD (IEC 61000-4-2) and 40 V load-dump spikes (ISO 7637-2 Pulse 5a) while maintaining <20 µA leakage at 12 V nominal. |
| Telecom Power Feeds | Consumer Sensor Interfaces |
Use Scenario: Overvoltage protection on 48 V PoE-powered Ethernet switch port DC input rails. IC Role / Device Role: Secondary clamping stage downstream of primary MOV, placed before DC-DC converter input. Use Value: Absorbs residual 600 W surges after MOV clipping, limiting voltage to 14.4 V to safeguard 50 V-rated input capacitors and controller ICs. |
Use Scenario: Signal line protection for I²C or SPI buses connecting MEMS accelerometers to host MCU in smart home hubs. IC Role / Device Role: Low-capacitance TVS on SDA/SCL lines, mounted adjacent to connector entry point. Use Value: Provides sub-15 V clamping with <20 µA leakage at 3.3 V, preserving bus timing margins and avoiding false ACK/NACK errors during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated. | Choose when end-product environmental requirements specify halogen-free materials per IEC 61249-2-21. |
| SMCJ8.5CA-E3/5B | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; 1500 W PPPM rating. | Requires larger PCB footprint and higher thermal mass; suited for higher-energy surge environments (e.g., outdoor telecom). | Select when system-level surge testing exceeds 600 W - e.g., IEC 61000-4-5 level 4 - and board space allows SMC outline. |
Compared with SMBJ8.5CA-E3/5B, the M3 variant offers identical protection performance with halogen-free construction, while the SMCJ8.5CA-E3/5B delivers 2.5× higher surge energy handling at the cost of 60% larger footprint - enabling tiered design-in based on test severity and space constraints.
Availability
SMBJ8.5CA-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer sensor interfaces requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ8.5CA-E3/5B 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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for board-level transient suppression in space-constrained applications, balancing high surge capability, low clamping voltage, and SMT manufacturability across automotive, industrial, and communications systems.
FAQ
What is the clamping voltage of SMBJ8.5CA-E3/5B at its rated peak pulse current?
The SMBJ8.5CA-E3/5B has a maximum clamping voltage (VC) of 14.4 V at 41.7 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings. The SMBJ8.5CA-E3/5B achieves this with minimal voltage overshoot due to its fast avalanche response.
Is SMBJ8.5CA-E3/5B suitable for bidirectional signal line protection?
Yes, SMBJ8.5CA-E3/5B is explicitly designed for bidirectional applications, as indicated by the "CA" suffix. Its symmetrical breakdown behavior ensures identical clamping performance for positive and negative transients - making it ideal for protecting AC-coupled interfaces like RS-485, CAN, LIN, or audio lines. Unlike unidirectional variants, SMBJ8.5CA-E3/5B has no cathode marking and requires no orientation during placement, simplifying assembly and reducing BOM complexity.
Does SMBJ8.5CA-E3/5B meet automotive qualification standards?
The standard SMBJ8.5CA-E3/5B is RoHS-compliant commercial grade and not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ8.5CAHE3_B/I variant (with HE3 suffix), which undergoes stress testing per AEC-Q101 and is rated for under-hood temperature ranges. Engineers must select the HE3 or HM3 version if the application requires formal automotive qualification - the SMBJ8.5CA-E3/5B remains appropriate for non-safety-critical consumer or industrial systems where AEC-Q101 is not mandated.
What is the thermal resistance of SMBJ8.5CA-E3/5B, and how does it affect PCB layout?
The SMBJ8.5CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. This value assumes standard FR-4 board thickness and no additional heatsinking. To maintain TJ ≤ 150 °C under sustained 5.0 W power dissipation, designers should ensure adequate copper area and avoid enclosing the device in thermally restrictive enclosures. Layouts using smaller pads will increase RθJA and reduce safe operating surge repetition rate.
How does the leakage current of SMBJ8.5CA-E3/5B impact low-power sensor circuits?
The SMBJ8.5CA-E3/5B specifies a maximum reverse leakage current (ID) of 20 µA at its 8.5 V stand-off voltage (VWM), measured at 25 °C. This low leakage ensures minimal loading on high-impedance sensor outputs or battery-backed circuits - for example, preserving >10-year shelf life in coin-cell-powered IoT nodes. At elevated temperatures (e.g., 85 °C), leakage may rise to ~200 µA, so designers should verify worst-case current draw in thermally demanding environments where SMBJ8.5CA-E3/5B is applied.
SMBJ8.5CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMBJ8.5CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ8.5CA-E3/5B 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-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA-E3/5B?
SMBJ8.5CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA-E3/5B 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-E3/5B?
For technical support, including SMBJ8.5CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ8.5CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA-E3/5B?
All SMBJ8.5CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA-E3/5B Tags
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