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Vishay General Semiconductor - Diodes Division SMBJ85CA-E3/5B
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- Part No.:
- SMBJ85CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA-E3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
SMBJ85CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 85 V standoff 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ85CA-E3/5B datasheet, SMBJ85CA-E3/5B pinout, SMBJ85CA-E3/5B application, or SMBJ85CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.39), MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical electrical characteristics in forward and reverse directions per ANSI/IEEE C62.35 standards. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, critical for suppressing ESD and lightning-induced surges on unprotected I/O lines.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). Derating above 25 °C ambient follows Fig. 2 in the datasheet, maintaining safe operation under repetitive transient conditions up to 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before clamping begins; defines upper limit of normal circuit operation. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Breakdown threshold range where device transitions from high-impedance to low-impedance clamping state. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream components. |
| PPPM | 600 W - Peak pulse power handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges when mounted per recommended pad layout. |
| IPPM | 4.4 A - Peak pulse current corresponding to VC; used to size series impedance and verify coordination with upstream fusing. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in enclosed industrial enclosures without forced airflow. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with J-STD-020 MSL Level 1 reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as anode and cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Bidirectional surge path | Either terminal serves as current entry point during positive or negative transients; no DC bias dependency. |
| Case | Non-connected thermal mass | Plastic-molded body provides mechanical protection and UL 94 V-0 flammability compliance; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN bus, Ethernet PHY interfaces. |
| 600 W peak pulse power | Validated for IEC 61000-4-5 combination wave (1.2/50 µs voltage, 8/20 µs current) up to 1 kV/500 A when properly laid out with minimum 0.2" × 0.2" copper pads. |
| Low clamping ratio (VC/VBR) | 1.39 typical - minimizes overvoltage exposure to protected ICs; critical for safeguarding 100 V-rated MOSFETs or 3.3 V/5 V logic inputs. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; eliminates production delays and moisture-related popcorning during assembly. |
| RoHS-compliant matte tin plating | Ensures reliable solderability per J-STD-002 and JESD 22-B102; prevents whisker growth per JESD 201 Class 2 for long-term reliability in automotive and industrial environments. |
Applications
| Industrial Power Supply Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤137 V during 4.4 A surges, preventing damage to 100 V input-rated buck controllers and enabling compliance with IEC 61000-4-4 Level 4. |
Use Scenario: Safeguarding RS-485 transceivers on base station line cards exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Placed differential-mode across A/B bus lines to suppress common-mode transients while preserving signal integrity. Use Value: Symmetrical clamping ensures equal protection for both polarities of half-duplex communication, maintaining data validity during ±1 kV EFT bursts. |
| Automotive Body Control Module (BCM) | Consumer Sensor Interface Protection |
Use Scenario: Shielding LIN bus nodes in door modules from battery voltage transients during jump-start events or alternator load dump. IC Role / Device Role / Timing Role: Connected between LIN line and ground to absorb energy from 12 V system spikes up to 100 V. Use Value: AEC-Q101 qualified variants available (HE3/HM3 suffix); this E3/5B version supports commercial-grade BCM designs requiring MSL Level 1 and RoHS compliance. |
Use Scenario: Securing I²C lines of MEMS accelerometers in smart home hubs against ESD events from user touch or cable coupling. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector entry to shunt ESD before reaching MCU GPIO pins. Use Value: Fast sub-nanosecond response captures human-body-model (HBM) ESD pulses (±8 kV), preventing latch-up or gate oxide rupture in 3.3 V sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same MSL Level 1 rating. | No functional difference; selected when halogen-free material compliance is required by OEM environmental policy. | Direct drop-in replacement where halogen-free bill-of-materials is mandated; no layout or qualification changes needed. |
| SMCJ85CA-E3/57T | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher thermal mass (RθJA = 50 °C/W vs. 100 °C/W). | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C) due to improved power dissipation. | Choose when thermal margin is constrained or when legacy SMC footprint exists; requires PCB pad revision. |
Compared with SMBJ85CA-E3/5B, the M3/5B offers identical protection performance with halogen-free construction, while the SMCJ85CA-E3/57T trades smaller footprint for superior thermal handling - making the SMBJ version optimal for space-constrained, cost-sensitive industrial PCBs where 600 W single-pulse capability suffices.
Availability
SMBJ85CA-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and consumer sensor interfaces requiring stable component supply and full traceability.
Supply support for SMBJ85CA-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, precision, and application-specific optimization.
The SMBJ family was engineered for high-energy transient suppression in compact SMT formats, targeting cost-effective, automated assembly in industrial, telecom, and automotive electronics where board space and surge immunity are critical.
FAQ
What is the clamping voltage of SMBJ85CA-E3/5B at its rated peak pulse current?
The SMBJ85CA-E3/5B has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 4.4 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88392. The SMBJ85CA-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ85CA-E3/5B suitable for bidirectional signal line protection?
Yes, SMBJ85CA-E3/5B is explicitly designed for bidirectional applications, as indicated by the "CA" suffix and confirmed in the datasheet's "DEVICES FOR BIDIRECTION APPLICATIONS" section. Its symmetrical VBR and VC characteristics apply equally in both polarities, making it ideal for protecting AC-coupled interfaces like RS-485, CAN, or Ethernet PHYs without polarity concerns. The SMBJ85CA-E3/5B requires no orientation during placement.
What is the moisture sensitivity level (MSL) rating for SMBJ85CA-E3/5B?
SMBJ85CA-E3/5B is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be subjected to standard reflow soldering profiles without pre-baking. This rating is stated in the "MECHANICAL DATA" section and verified by Vishay's qualification testing. The SMBJ85CA-E3/5B's matte tin-plated leads and UL 94 V-0 molding compound further support robust manufacturability in high-volume SMT lines.
How does SMBJ85CA-E3/5B differ from unidirectional SMBJ85A-E3/5B?
The SMBJ85CA-E3/5B is bidirectional with symmetrical clamping in both directions, whereas the unidirectional SMBJ85A-E3/5B has a defined cathode band and only clamps in reverse bias. Electrically, the CA version exhibits identical VWM, VBR, and VC in either polarity, while the A version conducts forward current below ~1.5 V and clamps only above VBR in reverse. The SMBJ85CA-E3/5B eliminates polarity marking and simplifies layout for floating or AC signals.
What is the maximum operating junction temperature for SMBJ85CA-E3/5B?
The SMBJ85CA-E3/5B has a maximum operating junction temperature (TJ) of +150 °C, as specified in the "MAXIMUM RATINGS" table. This allows reliable operation in sealed industrial enclosures or near heat-generating components. Derating curves in Figure 2 of the datasheet show that at 100 °C ambient, the device retains ~60% of its 600 W peak pulse power rating - a key design consideration for SMBJ85CA-E3/5B in thermally demanding applications.
SMBJ85CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ85CA-E3/5B FAQ
1.How can I place an order for SMBJ85CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA-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 SMBJ85CA-E3/5B reliable?
The price and inventory of SMBJ85CA-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 SMBJ85CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA-E3/5B?
SMBJ85CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA-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 SMBJ85CA-E3/5B?
For technical support, including SMBJ85CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ85CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA-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 SMBJ85CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85CA-E3/5B?
All SMBJ85CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA-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 SMBJ85CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ85CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CA-E3/5B Tags
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