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Vishay General Semiconductor - Diodes Division SMBJ8.5-E3/5B
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- Part No.:
- SMBJ8.5-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,716
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Product details
Overview
SMBJ8.5-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against inductive switching transients and lightning-induced surges. 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, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines of industrial sensor interfaces.
For engineers reviewing the SMBJ8.5-E3/5B datasheet, SMBJ8.5-E3/5B pinout, SMBJ8.5-E3/5B application, or SMBJ8.5-E3/5B equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal resistance data (RθJA = 100 °C/W), RoHS-compliant commercial-grade qualification, and real-world protection use cases for embedded power supply inputs and low-voltage I/O circuits.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity identification, leveraging a glass-passivated silicon junction for fast response (<1 ps) and low incremental surge resistance. Its 10/1000 µs waveform rating reflects standardized surge immunity testing per ANSI/IEEE C62.35, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
The SMBJ8.5-E3/5B is rated for -55 °C to +150 °C operating junction temperature, dissipates 5.0 W continuously on infinite heatsink at 50 °C ambient, and exhibits a positive temperature coefficient of VBR (+0.073 %/°C), enabling predictable voltage shift under thermal stress in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum reverse voltage before significant leakage; sets threshold for normal operation without clamping |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events |
| VC (Clamping Voltage) | 14.4 V at 41.7 A - Peak voltage seen by protected circuit during 10/1000 µs surge; defines worst-case stress level |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized transient waveform without failure |
| IPPM (Peak Pulse Current) | 41.7 A - Maximum surge current handled at VC; determines minimum trace width and PCB layout robustness |
| RθJA (Junction-to-Ambient) | 100 °C/W - Thermal resistance defining temperature rise per watt; critical for derating above 25 °C ambient |
| TJ max. | +150 °C - Absolute maximum junction temperature; constrains continuous power and surge repetition rate |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by a band at one end; anode is unmarked opposite terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit return path / surge sink | Connected to ground or low-impedance reference; carries full surge current during clamping |
| Anode (unbanded end) | Line-side connection / input rail | Connected to power rail or signal line being protected; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 12 V systems |
| 14.4 V clamping at 41.7 A | Limits downstream IC stress to safe levels for 3.3 V and 5 V logic interfaces during transients |
| Glass passivated chip junction | Ensures stable leakage performance (<20 µA at VWM) and long-term reliability under humidity and thermal cycling |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements while maintaining cost-effective volume procurement |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module Input |
|---|---|
Use Scenario: Protecting 5 V analog sensor outputs (e.g., pressure, temperature) from load-dump induced spikes on factory floor equipment. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before signal conditioning stage. Use Value: Limits clamped voltage to 14.4 V, preventing latch-up or damage to 5 V-tolerant ADC inputs while maintaining signal integrity below 8.5 V normal operation. |
Use Scenario: Safeguarding LIN bus transceiver power pins against battery reverse-connection and alternator load dump in BCM subassemblies. IC Role / Device Role / Timing Role: TVS mounted directly at 12 V input pin of LIN transceiver IC to absorb >100 V, 50 ms surges per ISO 7637-2. Use Value: Withstands 41.7 A peak current and clamps to ≤14.4 V, preserving transceiver functionality without requiring additional series impedance or filtering. |
| USB-C Power Delivery Line Protection | PLC Digital I/O Module Surge Suppression |
Use Scenario: Guarding 5 V VBUS line in USB-C receptacles against ESD and hot-swap transients in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS placed between connector and USB PD controller's VBUS monitor path to prevent false overvoltage shutdown. Use Value: Fast <1 ps response and 14.4 V clamping ensure no false triggering of OVP circuits while passing USB-IF ESD compliance tests (±15 kV air, ±8 kV contact). |
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: TVS installed across input terminals upstream of optocoupler isolation barrier to shunt surge energy before isolation stage. Use Value: 600 W rating handles repetitive 1 kV/42 Ω surges per IEC 61000-4-4; 8.5 V VWM ensures compatibility with 24 V nominal input thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package | Required where halogen-free material compliance is mandated (e.g., EU public infrastructure projects) | Select when halogen-free certification is contractually required; otherwise SMBJ8.5-E3/5B offers standard commercial compliance at lower cost |
| SMAJ8.5A-E3/61 | Same VWM/VC but in smaller SMA (DO-214AC) package; 400 W PPPM, higher RθJA (140 °C/W) | Suitable only for lower-energy transients or space-constrained layouts where 600 W margin is not needed | Choose only if board area is critical and surge threat level is ≤400 W; SMBJ8.5-E3/5B provides superior thermal and power handling in same footprint class |
Compared with SMBJ8.5A-M3/5B, the SMBJ8.5-E3/5B trades halogen-free content for broader commercial availability and lower unit cost; versus SMAJ8.5A-E3/61, it delivers 50 % higher surge power rating and 29 % lower thermal resistance - making it preferred for industrial and automotive front-end protection where reliability margins matter.
Availability
SMBJ8.5-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB-C power delivery designs, and PLC digital I/O protection requiring stable component supply across high-volume production cycles.
Supply support for SMBJ8.5-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 was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 readiness (in HE3 variants) are essential.
FAQ
What is the maximum clamping voltage of SMBJ8.5-E3/5B under a 10/1000 µs surge?
The SMBJ8.5-E3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on the protected circuit during surge events. The SMBJ8.5-E3/5B maintains this clamping performance across its specified operating temperature range and is validated in Vishay's Document Number 88392.
Is SMBJ8.5-E3/5B RoHS-compliant and what does the "E3" suffix indicate?
Yes, SMBJ8.5-E3/5B is RoHS-compliant, and the "E3" suffix explicitly denotes Vishay's commercial-grade, lead-free, RoHS-compliant construction per JEDEC standards. It uses matte tin-plated leads, meets JESD 201 Class 2 whisker resistance, and is qualified to MSL Level 1 with 260 °C peak reflow tolerance. The SMBJ8.5-E3/5B is not AEC-Q101 qualified - that requires the "HE3" suffix variant.
How does the SMBJ8.5-E3/5B differ from bidirectional versions like SMBJ8.5CA?
The SMBJ8.5-E3/5B is unidirectional and features a cathode band for polarity-sensitive placement, whereas SMBJ8.5CA is bidirectional with no polarity marking and symmetric clamping in both directions. Electrically, SMBJ8.5-E3/5B has a forward voltage drop (~3.5 V at 50 A) and supports IFSM = 100 A, while SMBJ8.5CA lacks forward conduction capability. The SMBJ8.5-E3/5B is used where DC bias exists (e.g., power rails); SMBJ8.5CA suits AC-coupled or differential signal lines.
What is the thermal resistance and how does it affect SMBJ8.5-E3/5B layout?
The SMBJ8.5-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly impacts power derating: at 70 °C ambient, its usable continuous power drops to ~2.5 W. Layout must provide adequate copper area and avoid thermal isolation - undersized pads or narrow traces will raise junction temperature and reduce surge endurance. The SMBJ8.5-E3/5B datasheet specifies pad dimensions in Document 88392, Figure "Mounting Pad Layout".
Can SMBJ8.5-E3/5B be used in automotive applications?
The SMBJ8.5-E3/5B itself is commercial-grade and not AEC-Q101 qualified; however, it is widely used in non-safety-critical automotive subsystems such as infotainment power rails and lighting control modules where qualification is not mandated. For AEC-Q101-compliant deployment, Vishay offers the SMBJ8.5HE3_B variant (with "HE3" suffix). The SMBJ8.5-E3/5B shares identical electrical characteristics and SMB package with its automotive-grade counterpart - only the qualification and traceability differ.
SMBJ8.5-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 37.7A
- 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)
SMBJ8.5-E3/5B FAQ
1.How can I place an order for SMBJ8.5-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5-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 SMBJ8.5-E3/5B reliable?
The price and inventory of SMBJ8.5-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 SMBJ8.5-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5-E3/5B?
SMBJ8.5-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5-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 SMBJ8.5-E3/5B?
For technical support, including SMBJ8.5-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5-E3/5B requirements.
6.How does Aetrix verify that SMBJ8.5-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5-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 SMBJ8.5-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5-E3/5B?
All SMBJ8.5-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5-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 SMBJ8.5-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5-E3/5B Tags
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