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Vishay General Semiconductor - Diodes Division SMBJ85D-M3/I
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- Part No.:
- SMBJ85D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85D-M3/I.pdf
- Description:
- TVS DIODE 85VWM 135VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,740
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Product details
Overview
SMBJ85D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 95.7–103 V breakdown voltage (VBR) at 1 mA, 135 V maximum clamping voltage (VC) at 4.46 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBJ85D-M3/I datasheet, SMBJ85D-M3/I pinout, SMBJ85D-M3/I application, or SMBJ85D-M3/I equivalent, key selection considerations include its ±3.5 % VBR tolerance, low 0.5 μA reverse leakage at VWM, M3 halogen-free/RoHS-compliant industrial-grade construction, and suitability for automotive body electronics, industrial I/O protection, and telecom power supply surge suppression.
Technical Context
This TVS diode operates as a unidirectional clamping device-cathode-banded end connects to the protected line, anode to ground-triggering avalanche conduction when transient voltage exceeds VBR. Its low incremental surge resistance and fast response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching transients.
Thermal performance is defined by RθJA = 125 °C/W (on minimum pad layout) and RθJM = 20 °C/W, with junction temperature rated from –55 °C to +150 °C. Power derating begins above TA = 25 °C, and steady-state dissipation is limited to 1.0 W at ambient and 5.0 W at case temperature TM = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR min/max | 95.7 V / 103 V at IT = 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 135 V at IPPM = 4.46 A - Clamping voltage under 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| ID @ VWM | 0.5 μA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance circuits. |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly; meets MSL level 1, 260 °C reflow. |
| Polarity | Unidirectional - Cathode band identifies terminal; enables DC rail protection without reverse conduction path. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, halogen-free and RoHS-compliant (M3 suffix). Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection | Connected to the circuit node requiring overvoltage protection (e.g., 85 V DC rail or sensor input). |
| Anode | Reference/ground return | Connected to system ground or low-impedance return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage thresholds and eliminates need for design margin padding. |
| 600 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge test requirements for industrial and telecom equipment up to Level 4. |
| 0.5 μA max reverse leakage at VWM | Minimizes standby power loss in battery-powered systems and prevents false triggering in high-Z analog inputs. |
| M3 industrial-grade qualification | Includes JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and extended temperature operation (–55 °C to +150 °C). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V CAN/LIN bus power rails and microcontroller I/O against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground to clamp surges before they reach MCU power pins. Use Value: Withstands 600 W surges and clamps to ≤135 V, ensuring downstream 3.3 V/5 V logic remains within absolute maximum ratings during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, shunting transient energy to chassis ground. Use Value: 85 V VWM allows compatibility with standard 24 V industrial supplies while providing 135 V clamping to protect optocoupler input stages and isolation barriers. |
| Telecom Power Supply Output | Consumer Appliance Motor Driver Stage |
Use Scenario: Secondary-side overvoltage protection on 48 V DC-DC converter outputs feeding base station RF modules. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS placed directly at output capacitor terminals to limit transient overshoot during hot-swap or short-circuit recovery. Use Value: 95.7–103 V VBR range ensures reliable activation above nominal 48 V output but below 135 V clamping threshold of downstream GaN FET gate drivers. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., washing machine drum drive). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive flyback voltage during PWM switching transitions. Use Value: 600 W peak power rating handles repetitive 10/1000 μs spikes from commutation arcs; low thermal resistance (RθJM = 20 °C/W) sustains reliability under frequent motor start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-M3/I | Bidirectional variant; same VWM (85 V), symmetric clamping in both polarities. | Required where AC-coupled signals or bidirectional data lines (e.g., RS-485) need protection without polarity constraints. | Select SMBJ85A-M3/I only if protecting balanced differential pairs or AC rails; SMBJ85D-M3/I is preferred for DC power rail protection due to lower leakage and tighter unidirectional control. |
| SMAJ85A-E3/5A | Lower PPPM (400 W), SMA package (smaller footprint), higher RθJA (150 °C/W), same VWM/VBR range. | Suitable for space-constrained consumer PCBs with lower surge exposure (e.g., USB port protection), not recommended for industrial 600 W surge environments. | Choose SMAJ85A-E3/5A only when board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2; SMBJ85D-M3/I provides superior thermal and power handling for demanding applications. |
Compared with SMBJ85A-M3/I and SMAJ85A-E3/5A, SMBJ85D-M3/I delivers higher surge robustness (600 W vs. 400 W), better thermal coupling (RθJM = 20 °C/W), and optimized unidirectional leakage (0.5 μA), making it the preferred choice for industrial and automotive DC rail protection where clamping precision and reliability are prioritized.
Availability
SMBJ85D-M3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and consistent M3-grade manufacturing compliance.
Supply support for SMBJ85D-M3/I 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 industrial-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting automated SMT assembly and extended temperature operation.
FAQ
What is the breakdown voltage range for SMBJ85D-M3/I?
The SMBJ85D-M3/I has a specified breakdown voltage (VBR) range of 95.7 V to 103 V at a test current of 1 mA, measured per ANSI/IEEE C62.35. This ±3.5 % tolerance ensures consistent clamping behavior across units and simplifies system-level overvoltage margining. The value is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 87606).
Is SMBJ85D-M3/I unidirectional or bidirectional?
SMBJ85D-M3/I is a unidirectional transient voltage suppressor, identified by the "D" suffix and marked with a cathode band on the SMB package. It conducts only when the cathode is positive relative to the anode, making it ideal for DC rail protection. Bidirectional variants use the "CD" suffix (e.g., SMBJ85CD-M3/I), which lack the cathode band and conduct in both polarities.
What does the "M3" suffix mean in SMBJ85D-M3/I?
The "M3" suffix indicates Vishay's industrial-grade qualification: halogen-free molding compound, RoHS compliance, JESD 201 Class 2 whisker resistance, and UL 94 V-0 flammability rating. It also specifies matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. This distinguishes SMBJ85D-M3/I from commercial-grade variants and confirms suitability for long-life industrial deployments.
What is the maximum clamping voltage of SMBJ85D-M3/I under surge conditions?
The SMBJ85D-M3/I exhibits a maximum clamping voltage (VC) of 135 V when subjected to its rated peak pulse current (IPPM) of 4.46 A using the standardized 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during transient events, directly impacting downstream component survivability.
Can SMBJ85D-M3/I be used in automotive applications?
Yes, SMBJ85D-M3/I is qualified for automotive body electronics applications including BCMs and lighting control modules. Its –55 °C to +150 °C operating junction temperature range, M3 industrial-grade construction, and ability to withstand ISO 7637-2 Pulse 5a load dump transients (via coordinated 600 W surge capability) make it suitable for under-hood and cabin-mounted systems where reliability under thermal and electrical stress is critical.
SMBJ85D-M3/I 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):
- 95.7V
- Voltage - Clamping (Max) @ Ipp:
- 135V
- Current - Peak Pulse (10/1000µs):
- 4.46A
- 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)
SMBJ85D-M3/I FAQ
1.How can I place an order for SMBJ85D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85D-M3/I 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 SMBJ85D-M3/I reliable?
The price and inventory of SMBJ85D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ85D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85D-M3/I?
SMBJ85D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85D-M3/I 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 SMBJ85D-M3/I?
For technical support, including SMBJ85D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85D-M3/I requirements.
6.How does Aetrix verify that SMBJ85D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85D-M3/I 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 SMBJ85D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ85D-M3/I?
All SMBJ85D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85D-M3/I, 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 SMBJ85D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ85D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85D-M3/I Tags
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