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Vishay General Semiconductor - Diodes Division SMBJ8.5A/54
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- Part No.:
- SMBJ8.5A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A/54.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
SMBJ8.5A/54 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 at 1 mA, 14.4 V maximum clamping voltage at 20 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive infotainment power inputs and industrial sensor I/O protection.
For engineers reviewing the SMBJ8.5A/54 datasheet, SMBJ8.5A/54 pinout, SMBJ8.5A/54 application, or SMBJ8.5A/54 equivalent, this device is selected for robust ESD and surge immunity in 12 V automotive subsystems, low-leakage DC rail clamping, and space-constrained PCB layouts requiring DO-214AA footprint compatibility and AEC-Q101 qualification path.
Technical Context
The SMBJ8.5A/54 operates as a unidirectional avalanche diode with cathode-banded polarity, optimized for fast response (<1 ps) to transient events including ISO 7637-2 pulse 1/2a/5a and IEC 61000-4-2 ESD. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance (Rdyn ≈ 0.27 Ω derived from ΔVC/ΔIPPM).
Thermal performance is defined by RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = 150 °C, supporting operation in under-hood environments. The device complies with J-STD-020 MSL Level 1 and meets UL 497B recognition for telecom and industrial protectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected circuit DC bias. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM with ±5.5% tolerance. |
| VC @ IPPM | 14.4 V at 20 A (10/1000 µs) - Clamping voltage defines worst-case overvoltage seen by downstream ICs during surge events. |
| PPPM | 600 W - Peak pulse power handling capacity determines survivability against standardized lightning/surge transients. |
| IPPM | 20 A - Maximum non-repetitive surge current supported without degradation; derates linearly above 25 °C ambient. |
| TJ(max) | 150 °C - Maximum junction temperature enables use in high-temperature automotive and industrial enclosures. |
| Package | SMB (DO-214AA) - 2-pin surface-mount outline with 0.220" × 0.155" footprint, compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse transient clamp. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail); band-marked end carries surge current into anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges on 12 V systems without external series impedance. |
| 14.4 V clamping at 20 A | Limits voltage stress on downstream 16 V-rated regulators or microcontrollers during 20 A transient events. |
| Low leakage: ≤1 µA at 8.5 V | Minimizes standby power loss in battery-backed modules and avoids false triggering in high-impedance sensor interfaces. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free assembly processes without preconditioning or special handling requirements. |
| AEC-Q101 qualification path | Facilitates automotive qualification when ordered with HE3/HM3 suffix; validates reliability for engine control, body electronics, and ADAS subsystems. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: 12 V supply rail feeding infotainment head unit exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and bulk capacitor to shunt transients before reaching DC/DC converter. Use Value: Clamps spikes up to 14.4 V while sustaining 600 W surge energy, preventing regulator latch-up and MCU brownout. |
Use Scenario: Analog output line (0–10 V) from pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point to suppress ESD and cable discharge events. Use Value: Sub-1 µA leakage preserves signal integrity; 14.4 V clamping protects 12-bit ADC front-end from damage during 8 kV contact ESD. |
| Telecom DC Feeder Protection | Consumer USB Port VBUS Clamp |
|
Use Scenario: -48 V DC power feed to remote radio unit in cellular base station cabinet. IC Role / Device Role / Timing Role: Primary overvoltage protector on input stage, coordinated with upstream fuse and secondary MOV. Use Value: 150 °C max junction temperature supports operation in sealed outdoor enclosures; UL 497B recognition satisfies telecom safety compliance. |
Use Scenario: VBUS line in portable speaker docking station with USB-C host interface. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to USB connector to absorb IEC 61000-4-2 ESD pulses before USB PHY. Use Value: 10.4 V max VBR ensures turn-on before VBUS overvoltage damages 5.5 V tolerant USB transceivers. |
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-E3/52 | Same electrical specs; RoHS-compliant commercial-grade variant with 7" tape/reel packaging. | No AEC-Q101 qualification; suitable for non-automotive industrial or consumer designs. | Select when cost-sensitive volume production requires standard commercial-grade sourcing without automotive traceability. |
| SMBJ8.5AHE3_B/H | Identical electrical specs; includes AEC-Q101 qualification, halogen-free molding compound, and enhanced traceability. | Required for automotive OEM BOMs where PPAP documentation and failure rate data are mandated. | Select when automotive qualification, extended temperature validation, or halogen-free compliance are contractually required. |
Compared with SMBJ8.5A/54, the SMBJ8.5A-E3/52 offers identical protection performance at lower cost but lacks automotive qualification records, while SMBJ8.5AHE3_B/H adds AEC-Q101 validation and halogen-free materials - critical for Tier 1 automotive supply chains but unnecessary for commercial power supplies.
Availability
SMBJ8.5A/54 is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial sensor I/O protection, and telecom DC feeder circuits requiring stable component supply across multi-year production cycles.
Supply support for SMBJ8.5A/54 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 application-specific optimization.
The SMBJ series targets board-level transient suppression in automotive, industrial, and telecom infrastructure, delivering high-power surge handling in compact surface-mount packages for space-constrained and high-reliability applications.
FAQ
What is the maximum clamping voltage of SMBJ8.5A/54 under surge conditions?
The SMBJ8.5A/54 has a maximum clamping voltage (VC) of 14.4 V when subjected to a 20 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ8.5A/54 maintains this clamping performance across its specified operating temperature range.
Is SMBJ8.5A/54 suitable for automotive applications?
The SMBJ8.5A/54 itself is not AEC-Q101 qualified, but it belongs to the SMBJ family for which Vishay offers AEC-Q101 variants (e.g., SMBJ8.5AHE3_B/H). For automotive use, designers must select the HE3 or HM3 suffix versions - the SMBJ8.5A/54 is intended for commercial/industrial applications where full automotive qualification is not required.
What package type does SMBJ8.5A/54 use, and what are its key mechanical dimensions?
The SMBJ8.5A/54 uses the SMB (DO-214AA) surface-mount package with overall dimensions of 0.220" × 0.155" (5.59 mm × 3.94 mm) and a maximum height of 0.096" (2.44 mm). Its cathode is marked by a band, and terminals are matte tin-plated for compatibility with J-STD-002 solderability standards. The SMBJ8.5A/54 mounts on 0.2" × 0.2" copper pads per datasheet recommendation.
How does SMBJ8.5A/54 compare to SMBJ54A in terms of voltage ratings?
The SMBJ8.5A/54 has a 8.5 V stand-off voltage (VWM) and 9.44–10.4 V breakdown range, targeting 12 V systems, whereas SMBJ54A has a 54 V VWM and 60–66.3 V VBR, designed for 48 V telecom or industrial rails. Their clamping voltages differ accordingly (14.4 V vs. 87.1 V), making them non-interchangeable without circuit redesign. The SMBJ8.5A/54 is not a low-voltage variant of SMBJ54A - they belong to the same family but serve distinct voltage domains.
What is the thermal resistance and maximum junction temperature specification for SMBJ8.5A/54?
The SMBJ8.5A/54 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads, and a maximum junction temperature (TJ(max)) of +150 °C. These values define its safe operating area under sustained power dissipation and transient overload conditions. The SMBJ8.5A/54 must be thermally managed within these limits to avoid parametric shift or permanent degradation.
SMBJ8.5A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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/54 FAQ
1.How can I place an order for SMBJ8.5A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A/54 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/54 reliable?
The price and inventory of SMBJ8.5A/54 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/54 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A/54?
SMBJ8.5A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A/54 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/54?
For technical support, including SMBJ8.5A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A/54 requirements.
6.How does Aetrix verify that SMBJ8.5A/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A/54?
All SMBJ8.5A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ8.5A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A/54 Tags
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