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Vishay General Semiconductor - Diodes Division SMBJ8.5A-E3/5B
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- Part No.:
- SMBJ8.5A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,013
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Product details
Overview
SMBJ8.5A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal 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 rating with 10/1000 µs waveform - deployed in automotive body control modules to protect CAN transceiver inputs against load dump and inductive switching transients.
For engineers reviewing the SMBJ8.5A-E3/5B datasheet, SMBJ8.5A-E3/5B pinout, SMBJ8.5A-E3/5B application, or SMBJ8.5A-E3/5B equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 100 °C/W) under PCB pad constraints, unidirectional polarity alignment with DC rail topology, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias (≤8.5 V), it presents <1 µA reverse leakage; when transient voltage exceeds ~9.44 V, it avalanches rapidly (<1 ns response) to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance.
Designed for mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, the device sustains 100 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range - enabling use in engine bay and under-hood electronics where thermal cycling and high ambient temperatures are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line's nominal DC voltage. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed avalanche onset range; defines minimum overvoltage threshold triggering clamping action. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage during 10/1000 µs surge; must remain below protected IC's absolute maximum input rating. |
| PPPM | 600 W - Peak transient power dissipation capability; determines survivability against standardized lightning/inductive surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on recommended pad layout; used to calculate max allowable power derating at elevated ambient temps. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-temperature automotive environments without thermal shutdown. |
| ID @ VWM | 1.0 µA - Reverse leakage current at 8.5 V; low value minimizes standby power loss in battery-critical systems. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, MSL Level 1, compatible with lead-free reflow (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 5 V or 12 V rail); polarity must match DC voltage direction to prevent forward conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without degradation. |
| 14.4 V clamping voltage at 41.7 A | Provides ≥1.5 V margin below typical 16 V absolute maximum rating of automotive MCUs and transceivers. |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free assembly without moisture-related popcorning or delamination risk. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| AEC-Q101 qualified option available | HE3/HM3 suffix variants meet stress test requirements for automotive electronic components (e.g., temperature cycling, HTRB). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rail and LIN bus inputs in BCM against load dump (ISO 16750-2) and relay coil flyback. IC Role / Device Role / Timing Role: Shunt clamping element placed between rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits rail overshoot to ≤14.4 V, preventing latch-up or permanent damage to 16 V-rated microcontrollers and LIN transceivers. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary front-end surge diverter on each optocoupler input path, absorbing energy before signal conditioning stage. Use Value: Maintains signal integrity by clamping induced spikes to <15 V while sustaining >100,000 surge cycles per channel per IEC 61000-4-4 compliance. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply EMI Filter Stage |
|
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor terminals and across H-bridge supply rails. Use Value: Absorbs repetitive 600 W inductive kickback pulses without parameter shift, extending MOSFET lifespan and reducing EMI emissions. |
Use Scenario: Secondary-level transient suppression after common-mode chokes in AC/DC telecom adapters. IC Role / Device Role / Timing Role: Final-stage DC bus protector on +48 V output, guarding DC-DC converter ICs from residual surges. Use Value: Delivers 14.4 V clamping at full rated current, ensuring downstream converters operate within safe SOA limits during lightning-induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and package; same thermal performance. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional regulation. | Choose when environmental compliance requires halogen-free construction without altering circuit design or layout. |
| SMBJ8.5CA-E3/5B | Bidirectional version; symmetric VBR (9.44–10.4 V) in both directions; ID doubled to 2.0 µA at VWM due to dual-junction structure. | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, USB D+/D−); not suitable for DC rail protection without polarity analysis. | Use only when protecting balanced differential signals or AC-powered circuits; avoid for unidirectional DC rails due to unnecessary leakage and cost premium. |
Compared with SMBJ8.5A-E3/5B, the M3 variant offers identical protection performance with halogen-free packaging, while the 8.5CA introduces bidirectional symmetry at the cost of higher leakage and reduced suitability for DC rail applications - making the E3/5B optimal for cost-sensitive, unidirectional automotive and industrial power-line protection.
Availability
SMBJ8.5A-E3/5B is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, consumer appliance motor drives, and telecom power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ8.5A-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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 qualification options, and robust thermal behavior under real-world surge conditions.
FAQ
What is the maximum clamping voltage of SMBJ8.5A-E3/5B under standard test conditions?
The SMBJ8.5A-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 JEDEC standards and represents the highest voltage that will appear across the SMBJ8.5A-E3/5B during a defined transient event - critical for ensuring compatibility with downstream ICs rated for ≤16 V absolute maximum input.
Is SMBJ8.5A-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
The SMBJ8.5A-E3/5B itself is the commercial-grade RoHS-compliant variant; however, Vishay offers AEC-Q101 qualified versions under ordering codes SMBJ8.5AHE3_B/I and SMBJ8.5AHM3_B/I. These HE3/HM3 variants share identical electrical parameters and SMB package but undergo additional stress testing per AEC-Q101. For automotive use, specify the HE3 or HM3 suffix rather than E3/5B unless qualification is not required.
How does the unidirectional configuration of SMBJ8.5A-E3/5B affect its placement in a circuit?
The SMBJ8.5A-E3/5B is unidirectional and marked with a cathode band; it must be oriented with the cathode toward the positive side of the protected line and anode to ground. Incorrect orientation causes forward conduction at ~0.7 V, leading to short-circuit failure. This configuration makes SMBJ8.5A-E3/5B ideal for DC rail protection but unsuitable for AC or bidirectional signal lines without external polarity management.
What is the thermal resistance and how does it impact PCB layout for SMBJ8.5A-E3/5B?
The SMBJ8.5A-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. To maintain safe junction temperature under repeated surges, PCB layout must replicate this pad area - undersized pads increase RθJA, causing excessive temperature rise and potential parametric shift or failure during sustained transient activity.
Can SMBJ8.5A-E3/5B replace SMBJ8.0A or SMBJ9.0A in an existing design?
SMBJ8.5A-E3/5B can substitute for SMBJ8.0A or SMBJ9.0A only if the protected circuit's nominal voltage and margin to clamping voltage remain acceptable: SMBJ8.0A has lower VWM (8.0 V) and VC (13.6 V), while SMBJ9.0A has higher VWM (9.0 V) and VC (15.4 V). Substituting SMBJ8.5A-E3/5B changes the clamping threshold and may reduce safety margin - verify system-level surge immunity and IC withstand ratings before replacement.
SMBJ8.5A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ8.5A-E3/5B FAQ
1.How can I place an order for SMBJ8.5A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A-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 SMBJ8.5A-E3/5B reliable?
The price and inventory of SMBJ8.5A-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 SMBJ8.5A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A-E3/5B?
SMBJ8.5A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A-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 SMBJ8.5A-E3/5B?
For technical support, including SMBJ8.5A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A-E3/5B requirements.
6.How does Aetrix verify that SMBJ8.5A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A-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 SMBJ8.5A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A-E3/5B?
All SMBJ8.5A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A-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 SMBJ8.5A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A-E3/5B Tags
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