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Vishay General Semiconductor - Diodes Division SMBJ85A-E3/5B
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- Part No.:
- SMBJ85A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85A-E3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,680
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Product details
Overview
SMBJ85A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ85A-E3/5B datasheet, SMBJ85A-E3/5B pinout, SMBJ85A-E3/5B application, or SMBJ85A-E3/5B equivalent, key selection considerations include clamping performance under 4.4 A surge, unidirectional polarity for DC-biased lines, RoHS-compliant matte tin-plated leads, and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AA footprint.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 85 V).
Thermal design relies on its RθJA of 100 °C/W and RθJL of 20 °C/W; derating applies above 25 °C ambient, with maximum junction temperature rated at +150 °C. The device meets MSL Level 1 per J-STD-020 and supports peak surge currents up to 4.4 A (10/1000 µs) without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPM | 600 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IPPM | 4.4 A - Peak pulse current corresponding to VC; used to size PCB trace width and thermal relief pads. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design limits for high-reliability industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm × 4.06 mm footprint; compatible with IPC-7351B generic land pattern. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; forms return path for clamped surge current. |
| Cathode | Protected line input terminal | Connected to signal/power line requiring protection; marked with band; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and telecom interfaces. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| Glass passivated chip junction | Ensures long-term stability of VBR and low leakage (<1 µA) across temperature and lifetime stress conditions. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risk. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and packaging requirements for global commercial electronics manufacturing. |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O lines against inductive kickback from relay coils and solenoid actuators. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between MCU GPIO and 12 V switched load, referenced to chassis ground. Use Value: Limits transient voltage to ≤137 V, preventing latch-up or oxide damage in 3.3 V/5 V logic while surviving ≥100,000 surge events. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to battery dump and load-dump events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail feeding Hall-effect sensors and window motor controllers. Use Value: Maintains 85 V VWM margin above nominal 12 V system, clamping dump transients within safe SOA of downstream LDOs and CAN/LIN transceivers. |
| Telecom Power Input Stage | Consumer Appliance Mainboard |
|
Use Scenario: Input-stage protection for AC/DC adapters and PoE-powered equipment subjected to lightning-induced surges on primary-side DC bus. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS on 48 V intermediate bus, coordinated with MOV and fuse upstream. Use Value: Provides precise 137 V clamping to safeguard 60 V-rated DC-DC controllers and reduce need for overrated FETs or capacitors. |
Use Scenario: ESD and surge protection for user-interface buttons, display backlight drivers, and fan control outputs in washing machines and HVAC systems. IC Role / Device Role / Timing Role: Localized TVS on 24 V motor driver outputs and 5 V microcontroller reset lines. Use Value: Withstands repeated 4.4 A surges from brushed motor commutation noise, extending field reliability beyond 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-E3/5B | Bidirectional variant; symmetrical VBR (±94.4–104 V); no polarity marking; higher ID leakage at VWM. | Required for AC-coupled or floating signal lines (e.g., RS-485, audio inputs) where polarity reversal occurs. | Select only if bidirectional clamping is mandatory; otherwise SMBJ85A-E3/5B offers lower leakage and simpler layout. |
| SMCJ85A-E3/57T | Larger SMC (DO-214AB) package; same VWM/VBR/VC; higher IPPM (7.1 A); RθJA = 50 °C/W. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) requiring >600 W dissipation. | Choose when PCB space allows larger footprint and thermal management supports higher sustained power. |
Compared with SMBJ85CA-E3/5B and SMCJ85A-E3/57T, the SMBJ85A-E3/5B provides optimal balance of compact SMB footprint, low leakage, and sufficient 600 W surge rating for board-level DC rail and signal line protection in space-constrained industrial and automotive modules.
Availability
SMBJ85A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and consumer appliance mainboards requiring stable component supply and RoHS-compliant transient protection.
Supply support for SMBJ85A-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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments-designed to meet industrial, automotive, and telecom surge immunity standards while supporting high-volume SMT manufacturing.
FAQ
What is the maximum clamping voltage of SMBJ85A-E3/5B under surge conditions?
The SMBJ85A-E3/5B has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components have voltage ratings exceeding 137 V to maintain functional safety.
Is SMBJ85A-E3/5B suitable for automotive applications?
The SMBJ85A-E3/5B is a commercial-grade RoHS-compliant part (E3 suffix) and not AEC-Q101 qualified. For automotive use, Vishay offers the AEC-Q101 qualified variant SMBJ85AHE3_B/I. While SMBJ85A-E3/5B may function in non-safety-critical automotive subsystems, it lacks the extended temperature cycling, humidity, and lifetime validation required for certified automotive deployment. Always verify qualification status via the full ordering code.
How does the SMBJ85A-E3/5B differ from the SMBJ85CA-E3/5B?
The SMBJ85A-E3/5B is unidirectional with cathode-band polarity marking and reverse leakage <1 µA at 85 V, whereas the SMBJ85CA-E3/5B is bidirectional with symmetrical breakdown in both directions and higher leakage (≤2 µA). The unidirectional version is preferred for DC-biased lines like power rails and digital I/O, while the bidirectional variant suits AC signals or floating buses such as RS-485 or audio paths where polarity reversal occurs.
What is the thermal resistance and how does it affect PCB layout for SMBJ85A-E3/5B?
The SMBJ85A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain TJ ≤150 °C, PCB copper pad area must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal. Reducing pad size increases thermal impedance, risking premature failure under repetitive surges. Thermal vias under pads further improve heat dissipation in high-duty-cycle applications.
Can SMBJ85A-E3/5B be used in place of SMAJ85A?
No-SMBJ85A-E3/5B and SMAJ85A are not interchangeable. The SMBJ series uses the larger SMB (DO-214AA) package (5.59 mm × 4.06 mm), while SMAJ uses the smaller SMA (DO-214AC) package (4.57 mm × 2.62 mm). Though both share 85 V VWM, the SMBJ85A-E3/5B delivers higher peak pulse power (600 W vs. 400 W for SMAJ85A) and higher IPPM (4.4 A vs. 2.9 A). Substitution requires PCB footprint redesign and verification of surge energy requirements.
SMBJ85A-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMBJ85A-E3/5B FAQ
1.How can I place an order for SMBJ85A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85A-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 SMBJ85A-E3/5B reliable?
The price and inventory of SMBJ85A-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 SMBJ85A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85A-E3/5B?
SMBJ85A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85A-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 SMBJ85A-E3/5B?
For technical support, including SMBJ85A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85A-E3/5B requirements.
6.How does Aetrix verify that SMBJ85A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85A-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 SMBJ85A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85A-E3/5B?
All SMBJ85A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85A-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 SMBJ85A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ85A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85A-E3/5B Tags
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