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Vishay General Semiconductor - Diodes Division SMB8J8.5C-E3/5B
- Part No.:
- SMB8J8.5C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5C-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,119
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Product details
Overview
SMB8J8.5C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection 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, 14.4 V clamping voltage (VC) at 40 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J8.5C-E3/5B datasheet, SMB8J8.5C-E3/5B pinout, SMB8J8.5C-E3/5B application, or SMB8J8.5C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes. Its symmetrical I-V characteristics support bidirectional overvoltage clamping without polarity dependency.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J8.5C-E3/5B is engineered for automotive-grade reliability in harsh environments. Thermal resistance is 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting stable operation under repetitive surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 5 V–12 V signal/power rails. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - ensures consistent breakdown initiation across production lots; guarantees clamping activation within defined tolerance band. |
| VC @ IPPM | 14.4 V at 40 A (10/1000 µs) - peak clamped voltage seen by protected circuit during worst-case surge; determines downstream IC survivability. |
| PPPM | 800 W - maximum non-repetitive surge power dissipation; enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated stand-off voltage; preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max. | 150 °C - maximum junction temperature rating; supports operation in under-hood automotive and industrial control cabinet environments. |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 5.21 mm × 4.06 mm body and 2.18 mm height; compatible with IPC-7351B footprint. |
Pinout & Package
DO-214AA (SMB) package: bi-directional device with no polarity marking; symmetrical two-terminal construction. Cathode band absent - terminals are interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both) | Surge current path | Bi-directional conduction path; either terminal serves as input/output for transient energy diversion to ground or rail. |
| Case | Thermal interface | Exposed metal slug (not electrically connected); provides primary thermal path to PCB copper for sustained power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment I/O; includes HTOL, TC, and ESD testing. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; eliminates moisture-related popcorning during assembly. |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR and leakage performance under thermal cycling and humidity stress. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs; improves margin versus 12 V rail or 3.3 V logic-level interfaces. |
| Matte tin-plated leads | Ensures solderability per J-STD-002 and JESD 22-B102; E3 suffix meets JESD 201 Class 1A whisker resistance. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between signal line and ground, responding within <1 ns to transients exceeding VWM. Use Value: Maintains signal integrity below 14.4 V during 40 A surges, preventing latch-up or damage to 5 V tolerant transceivers per ISO 16750-2. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid switching and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines, clamping transients before they reach optocoupler or Schmitt trigger inputs. Use Value: Withstands 800 W pulses without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements. |
| USB Port ESD Protection | Power Supply Rail Clamp |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in automotive infotainment head units and industrial HMIs. IC Role / Device Role / Timing Role: Fast-reacting bi-directional clamp placed after primary common-mode choke, shunting ±15 kV HBM ESD pulses. Use Value: 1.0 µA leakage at 8.5 V prevents signal attenuation; 14.4 V VC ensures USB PHY receivers remain within absolute maximum ratings. |
Use Scenario: Overvoltage clamp on 12 V auxiliary power rails feeding microcontrollers and communication ICs in telematics modules. IC Role / Device Role / Timing Role: Standoff-rated protector that remains non-conductive during normal operation but clamps load-dump spikes up to 200 ms duration. Use Value: 150 °C TJ max and 72 °C/W RθJA allow sustained operation in sealed enclosures; 8.5 V VWM aligns with nominal 12 V system tolerances. |
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 | Same VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V), but rated for 1000 W PPPM (uni-directional only); bi-directional variant not offered. | Requires polarity-aware layout; unsuitable for AC-coupled or floating signal lines where bi-directionality is mandatory. | Select SMBJ8.5CA only if unidirectional clamping suffices and higher 1000 W rating is required for specific surge profiles. |
| SMCJ8.5CA | Same electrical specs but in larger DO-214AB (SMC) package; 1500 W PPPM rating; RθJA = 35 °C/W vs. 72 °C/W for SMB8J8.5C-E3/5B. | Better thermal performance and higher surge capacity, but occupies ~2.5× PCB area; incompatible with space-constrained SMB footprints. | Choose SMCJ8.5CA when board space allows and thermal derating or >800 W surge handling is critical; otherwise retain SMB8J8.5C-E3/5B for compactness. |
Compared with SMBJ8.5CA and SMCJ8.5CA, SMB8J8.5C-E3/5B uniquely delivers bi-directional 800 W surge protection in the smallest standardized SMB footprint, balancing automotive qualification, layout efficiency, and thermal adequacy for most 12 V system I/O protection tasks.
Availability
SMB8J8.5C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, USB port ESD hardening, and 12 V power rail clamping requiring stable component supply and AEC-Q101 traceability.
Supply support for SMB8J8.5C-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, power density, and automotive-grade qualification.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, surface-mount transient suppression in automotive, industrial, and communications infrastructure where space, robustness, and AEC-Q101 compliance are essential.
FAQ
What is the clamping voltage of SMB8J8.5C-E3/5B at its rated peak pulse current?
The SMB8J8.5C-E3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 40 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures protected circuits experience no more than 14.4 V during surge events - critical for safeguarding 12 V tolerant ICs and interfaces. The SMB8J8.5C-E3/5B maintains this performance across its full operating temperature range.
Is SMB8J8.5C-E3/5B suitable for automotive applications?
Yes, SMB8J8.5C-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and cabin environments. It meets stringent requirements for temperature cycling, high-temperature operating life, and ESD robustness. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and glass-passivated junction make SMB8J8.5C-E3/5B appropriate for engine control units, ADAS sensor modules, and infotainment systems - all validated per the Vishay qualification report for this part number.
How does the bi-directional nature of SMB8J8.5C-E3/5B affect its circuit implementation?
As a bi-directional TVS, SMB8J8.5C-E3/5B has no polarity marking and functions identically regardless of voltage polarity across its terminals - ideal for AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating sensor outputs. Unlike uni-directional variants, it requires no orientation during placement and clamps both positive and negative transients above ±8.5 V. This simplifies layout and eliminates risk of reverse installation - a key advantage of SMB8J8.5C-E3/5B in mixed-signal and automotive networks.
What is the thermal resistance of SMB8J8.5C-E3/5B, and how does it impact PCB layout?
SMB8J8.5C-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AA specification. To maintain safe junction temperatures during repetitive surges, designers must allocate adequate copper area and consider thermal vias - especially since SMB8J8.5C-E3/5B's 800 W rating is derated above 25 °C ambient. Layout directly governs real-world power handling.
Does SMB8J8.5C-E3/5B meet RoHS and lead-free assembly requirements?
Yes, SMB8J8.5C-E3/5B carries the "E3" suffix, indicating RoHS-compliance per Directive 2011/65/EU and suitability for lead-free reflow soldering. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the E3 designation confirms passing JESD 201 Class 1A whisker testing. The device is rated for peak reflow temperatures up to 260 °C (MSL Level 1), making SMB8J8.5C-E3/5B fully compatible with modern high-volume SMT manufacturing processes.
SMB8J8.5C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 50.3A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J8.5C-E3/5B FAQ
1.How can I place an order for SMB8J8.5C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5C-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 SMB8J8.5C-E3/5B reliable?
The price and inventory of SMB8J8.5C-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 SMB8J8.5C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J8.5C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5C-E3/5B?
SMB8J8.5C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5C-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 SMB8J8.5C-E3/5B?
For technical support, including SMB8J8.5C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5C-E3/5B requirements.
6.How does Aetrix verify that SMB8J8.5C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5C-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 SMB8J8.5C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J8.5C-E3/5B?
All SMB8J8.5C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5C-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 SMB8J8.5C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J8.5C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5C-E3/5B Tags
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