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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3/I
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- Part No.:
- SMBJ85CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,354
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Product details
Overview
SMBJ85CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the 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 a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ85CAHM3/I datasheet, SMBJ85CAHM3/I pinout, SMBJ85CAHM3/I application, or SMBJ85CAHM3/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (<1.62×VWM), halogen-free RoHS compliance, and AEC-Q101 qualification readiness are required in space-constrained PCB layouts.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 85 V), while the low incremental surge resistance supports fast energy dissipation during transient events.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility support high-yield automated assembly in commercial and automotive-grade production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage under 600 W 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 3/4 surge immunity. |
| IPPM | 4.4 A - Peak pulse current corresponding to 600 W at 137 V; used to size PCB trace width and layout clearance. |
| TJ max | 150 °C - Maximum junction temperature; sets thermal derating limits for sustained power dissipation. |
| Package | SMB (DO-214AA) - 3.94 mm × 2.13 mm footprint with gull-wing leads; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity; enables bidirectional clamping without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and ungrounded sensor outputs without external polarity management. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets IPC-1752A material declaration standards and environmental compliance mandates for global OEM shipments. |
| AEC-Q101 qualification ready | Base HM3 variant supports automotive qualification path; meets stress test requirements for under-hood and infotainment subsystems. |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and allows use in standard lead-free assembly without baking or special handling. |
Applications
| Industrial Power Supply Input Protection | RS-485 Communication Line Protection |
|---|---|
|
Use Scenario: Protecting DC input rails of programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across +VIN and GND to limit surge voltage to <137 V. Use Value: Prevents damage to upstream DC-DC controllers and downstream microcontrollers by limiting transient energy within IEC 61000-4-4/5 Class 3 thresholds. |
Use Scenario: Safeguarding full-duplex RS-485 transceivers in factory automation networks exposed to ground potential differences and EFT noise. IC Role / Device Role / Timing Role: Paired TVS devices (e.g., one per line) shunting differential and common-mode surges between A/B and GND. Use Value: Maintains signal integrity during 4 kV ESD and 2 kV surge events while preserving data rates up to 10 Mbps without added capacitance penalty. |
| Automotive Body Control Module (BCM) Sensor Interface | Telecom Line Card Surge Protection |
|
Use Scenario: Protecting analog inputs of BCMs connected to temperature, humidity, and position sensors in 12 V vehicle systems. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) bidirectional clamp placed at connector entry point to suppress ISO 7637-2 Pulse 1/2a/5a transients. Use Value: Ensures sensor signal accuracy remains unaffected during cold-crank and load-dump events, supporting ASIL-B functional safety goals. |
Use Scenario: Front-end protection of DSL or POTS line interface circuits in central office and CPE equipment. IC Role / Device Role / Timing Role: Primary surge suppression stage before transformer coupling and line driver ICs, rated for repeated lightning-induced surges. Use Value: Withstands >1000 surges at 600 W without parameter shift, extending field-replaceable unit lifetime in telco infrastructure. |
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-E3/52 | RoHS-compliant but not halogen-free; no AEC-Q101 qualification path; same electrical specs and SMB package. | Suitable for commercial-grade consumer electronics where halogen content and automotive qualification are not mandated. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMCJ85CAHM3 | Higher 1500 W peak pulse power; larger SMC (DO-214AB) package (7.11 mm × 6.22 mm); identical VWM/VC ratings. | Used where higher surge energy handling is needed (e.g., outdoor telecom enclosures), accepting larger board area. | Choose when system-level surge testing exceeds 600 W and PCB space permits larger footprint. |
Compared with SMBJ85CAHM3/I, the E3/52 variant trades halogen-free compliance for lower cost in non-automotive settings, while the SMCJ85CAHM3 delivers 2.5× pulse power in a 2.5× larger package - making SMBJ85CAHM3/I optimal for space-constrained, environmentally regulated, and automotive-prequalified designs.
Availability
SMBJ85CAHM3/I is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication modules, automotive body control units, and telecom line card designs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMBJ85CAHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series was developed for high-reliability transient suppression in compact surface-mount formats, targeting industrial, automotive, and communications systems where robustness, small footprint, and consistent clamping behavior are critical.
FAQ
What is the clamping voltage of SMBJ85CAHM3/I under a 600 W surge?
The SMBJ85CAHM3/I clamps to a maximum of 137 V when subjected to its rated 600 W peak pulse power with a 10/1000 µs waveform. This occurs at a peak pulse current of 4.4 A, and the value is guaranteed per Vishay's datasheet specification table on page 2. The clamping voltage directly determines the maximum stress imposed on downstream components during transient events, making it a key parameter for circuit survivability validation.
Is SMBJ85CAHM3/I suitable for automotive applications?
Yes - the HM3 suffix indicates halogen-free, RoHS-compliant construction and alignment with AEC-Q101 qualification requirements. While the base SMBJ85CAHM3/I part itself is not pre-certified, Vishay explicitly states that HM3-suffix variants are qualified per AEC-Q101 (see Mechanical Data section, page 1). Customers may request qualification reports or use this part in automotive designs pending internal validation per their QM system.
How does SMBJ85CAHM3/I differ from unidirectional SMBJ85A variants?
The SMBJ85CAHM3/I is bidirectional, meaning it clamps symmetrically for both positive and negative transients, with no cathode band marking. In contrast, the unidirectional SMBJ85A has a marked cathode end and only clamps in reverse bias. Electrically, SMBJ85CAHM3/I has identical VWM (85 V) and VC (137 V), but its breakdown is specified for both polarities - making it ideal for AC, differential, or floating-line protection where polarity cannot be assumed.
What is the thermal resistance of SMBJ85CAHM3/I in standard mounting conditions?
The SMBJ85CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Thermal Characteristics table (page 3). This value is critical for calculating junction temperature rise under sustained leakage or repetitive surge conditions and confirms suitability for operation up to 150 °C maximum junction temperature.
Does SMBJ85CAHM3/I require orientation during PCB placement?
No - SMBJ85CAHM3/I is a bidirectional TVS diode with symmetrical terminals and no polarity marking. Unlike unidirectional variants (e.g., SMBJ85A), it has no cathode band and functions identically regardless of orientation on the PCB. This simplifies automated assembly, eliminates orientation-related solder defects, and supports flexible layout routing for differential or AC-coupled protection schemes.
SMBJ85CAHM3/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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85CAHM3/I FAQ
1.How can I place an order for SMBJ85CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3/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 SMBJ85CAHM3/I reliable?
The price and inventory of SMBJ85CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3/I?
SMBJ85CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3/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 SMBJ85CAHM3/I?
For technical support, including SMBJ85CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3/I requirements.
6.How does Aetrix verify that SMBJ85CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3/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 SMBJ85CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3/I?
All SMBJ85CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3/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 SMBJ85CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHM3/I Tags
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