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Vishay General Semiconductor - Diodes Division SMBJ85A-M3/52
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- Part No.:
- SMBJ85A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85A-M3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,411
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Product details
Overview
SMBJ85A-M3/52 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), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and telecom power supplies.
For engineers reviewing the SMBJ85A-M3/52 datasheet, SMBJ85A-M3/52 pinout, SMBJ85A-M3/52 application, or SMBJ85A-M3/52 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal derating above 25 °C ambient, unidirectional polarity marking (cathode band), and halogen-free RoHS compliance per M3 suffix - critical for high-reliability PCB designs requiring AEC-Q101-optional qualification paths.
Technical Context
This TVS operates as a silicon avalanche diode, triggering into low-impedance conduction when reverse voltage exceeds VBR, thereby shunting surge energy away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive transients.
Designed for unidirectional protection only, SMBJ85A-M3/52 exhibits 1.0 µA max reverse leakage at 85 V (VWM), 0.106 %/°C temperature coefficient of VBR, and 100 °C/W junction-to-ambient thermal resistance - requiring careful PCB copper pad layout (0.2" × 0.2") to sustain rated 600 W pulse power without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit's normal operating rail. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed avalanche initiation range; determines minimum overvoltage threshold for clamping action. |
| VC @ IPPM | 137 V at 4.4 A - clamped voltage during 10/1000 µs surge; must remain below protected device's absolute max rating. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; defines single-event surge energy capacity. |
| ID @ VWM | 1.0 µA - reverse leakage at 85 V; low value minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood or enclosed industrial environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by a band on the body end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes conduction path during reverse surge events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 85 V supply rail); polarity band identifies this terminal; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables suppression of high-energy transients from inductive switching (e.g., solenoid drivers) without failure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising surges (<1 ns response), improving protection fidelity for sensitive ICs. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive OEMs without compromising surge performance. |
| MSL Level 1 (J-STD-020), 260 °C reflow peak | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| AEC-Q101 qualified variants available | Enables drop-in qualification path via HM3 suffix variants - same SMB package and electrical specs with automotive stress validation. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 85 V DC bus in brushless motor controllers against back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC input terminals to clamp inductive kickback surges. Use Value: Limits transient voltage to ≤137 V, preventing gate oxide damage to 100 V-rated MOSFETs and driver ICs. |
Use Scenario: Guarding LIN bus power rail (typically 12 V nominal, up to 85 V load-dump) in door module ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing ISO 7637-2 Pulse 5a load-dump energy without crowbar action. Use Value: Maintains system uptime by avoiding fuse blow or regulator latch-up during 12 V system transients. |
| Telecom Power Supplies | Industrial PLC I/O Modules |
Use Scenario: Input-stage protection of 48 V–96 V telecom rectifiers exposed to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Primary-level TVS on DC output side, coordinated with upstream MOVs and fuses. Use Value: Provides precise 85 V clamping margin above nominal 48 V rail, enabling tighter design margins than generic 100 V TVS. |
Use Scenario: Protecting analog input channels (e.g., 4–20 mA loops) from ESD and field-wiring faults in factory automation systems. IC Role / Device Role / Timing Role: Localized TVS at connector entry point, limiting voltage seen by precision op-amps and ADC front-ends. Use Value: Ensures <1.0 µA leakage at 85 V standoff, eliminating measurement drift in high-impedance sensor interfaces. |
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-E3/52 | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (E3 vs. M3). | No difference in protection function; E3 variant used where halogen-free requirement is not mandated. | Select SMBJ85A-E3/52 for commercial-grade cost-sensitive designs without halogen restrictions. |
| SMBJ85AHM3_B/I | Identical VWM, VBR, VC, and PPPM; AEC-Q101 qualified, halogen-free, supplied in 13" tape. | Validated for automotive under-hood use; supports PPAP documentation and extended temperature cycling. | Choose SMBJ85AHM3_B/I when automotive qualification, traceability, or volume packaging (3200 pcs/reel) is required. |
Compared with SMBJ85A-M3/52, the E3 variant offers identical surge protection at lower material cost where halogen-free compliance is optional, while the HM3 variant adds automotive qualification and larger reel packaging - enabling seamless transition from industrial to automotive BOMs without redesign.
Availability
SMBJ85A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, halogen-free compliance, and consistent 85 V standoff performance.
Supply support for SMBJ85A-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series delivers standardized transient suppression in the SMB package for industrial, automotive, and telecom applications - engineered to balance high pulse power, tight VBR tolerance, and manufacturability in high-volume SMT lines.
FAQ
What is the maximum clamping voltage of SMBJ85A-M3/52 under a 10/1000 µs surge?
The SMBJ85A-M3/52 has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the highest voltage that will appear across the protected line during a specified transient event - critical for ensuring compatibility with downstream 100 V-rated components. The SMBJ85A-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ85A-M3/52 suitable for bidirectional transient protection?
No, SMBJ85A-M3/52 is a unidirectional TVS diode, intended only for DC line protection where polarity is fixed. Bidirectional protection requires the CA-suffixed variant (e.g., SMBJ85CA). The SMBJ85A-M3/52 features a cathode band marking and conducts only in reverse bias - forward conduction is limited to 3.5 V at 50 A, making it unsuitable for AC or symmetrical surge scenarios. Always verify polarity alignment during PCB layout for SMBJ85A-M3/52.
What does the "M3" suffix indicate in SMBJ85A-M3/52?
"M3" denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standard, with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. Unlike the E3 suffix, M3 guarantees absence of brominated flame retardants and chlorine-based compounds - required for many industrial and automotive OEMs. The SMBJ85A-M3/52 retains identical electrical and thermal specs as E3 variants, differing only in material composition.
Can SMBJ85A-M3/52 be used in automotive applications?
SMBJ85A-M3/52 itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ85AHM3_B/I variant with full AEC-Q101 qualification, same SMB package, and identical electrical parameters. For automotive use, specify the HM3-suffixed part - the SMBJ85A-M3/52 may be used in non-safety-critical prototype or aftermarket contexts, but OEM production requires the qualified version to meet stress test requirements including temperature cycling and humidity bias HAST.
What PCB layout guidelines apply to SMBJ85A-M3/52 for optimal thermal performance?
To sustain the rated 600 W peak pulse power, Vishay specifies mounting SMBJ85A-M3/52 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with internal copper planes connected via multiple thermal vias. Trace inductance must be minimized - keep traces short and wide between SMBJ85A-M3/52 and protected node. Avoid routing high-speed signals near the device, and ensure no solder mask over thermal pads. Failure to follow these guidelines results in elevated junction temperature and reduced surge endurance for SMBJ85A-M3/52.
SMBJ85A-M3/52 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-M3/52 FAQ
1.How can I place an order for SMBJ85A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85A-M3/52 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-M3/52 reliable?
The price and inventory of SMBJ85A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85A-M3/52?
SMBJ85A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85A-M3/52 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-M3/52?
For technical support, including SMBJ85A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85A-M3/52 requirements.
6.How does Aetrix verify that SMBJ85A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85A-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85A-M3/52?
All SMBJ85A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85A-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ85A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85A-M3/52 Tags
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