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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3_A/H
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- Part No.:
- SMBJ85CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,105
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Product details
Overview
SMBJ85CAHM3_A/H 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 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 (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment against ESD and inductive switching surges.
For engineers reviewing the SMBJ85CAHM3_A/H datasheet, SMBJ85CAHM3_A/H pinout, SMBJ85CAHM3_A/H application, or SMBJ85CAHM3_A/H equivalent, this part serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for bidirectional overvoltage protection where low clamping voltage, fast response time, and stable thermal performance up to 150 °C junction temperature are required.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures consistent breakdown behavior and low leakage (<1.0 μA at VWM), while the 10/1000 μs surge rating reflects real-world lightning and load-switching transient immunity.
The device uses a planar junction structure mounted on 0.2" × 0.2" copper pads, delivering 100 °C/W junction-to-ambient thermal resistance and supporting repetitive surge duty cycles up to 0.01%. Its MSL Level 1 rating and matte tin-plated leads ensure compatibility with standard SMT reflow profiles up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal 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. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in high-ambient environments like motor drives and base stations. |
| 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), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H); cathode/anode terminals are symmetrical and non-polarized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path terminal | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or differential signals without polarity concerns. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in industrial motor controls and telecom power supplies. |
| 137 V clamping voltage at 4.4 A | Limits voltage overshoot to safe levels for 100 V-rated MOSFETs and logic interfaces. |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability standards and environmental compliance for industrial-grade deployment. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Industrial Motor Drive Power Input | Automotive Body Control Module (BCM) Signal Lines |
|---|---|
Use Scenario: Protection of DC bus input against inductive kickback from relay coils and contactor switching. IC Role / Device Role / Timing Role: Bidirectional TVS clamps transient spikes before they reach upstream DC-DC converters or microcontrollers. Use Value: Prevents latch-up or gate oxide damage in 100 V-rated power MOSFETs by limiting surge voltage to ≤137 V. |
Use Scenario: Shielding LIN or CAN physical layer signal lines from battery dump and load-dump events. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to absorb ±100 V transients. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) with no additional series impedance or timing delay. |
| Telecom Base Station DC Power Feeds | Consumer Smart Meter Sensor Interfaces |
Use Scenario: Guarding 48 V DC input rails against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS in cascade with MOVs and gas discharge tubes for staged surge suppression. Use Value: Provides precise clamping (137 V) with low leakage (<1 μA), avoiding false resets in always-on monitoring circuits. |
Use Scenario: Protecting analog sensor inputs (e.g., current shunt, thermistor) from ESD and nearby relay switching noise. IC Role / Device Role / Timing Role: Localized TVS placed adjacent to ADC input pins to suppress sub-100 ns transients. Use Value: Enables direct connection to 3.3 V or 5 V rail without level-shifting, thanks to low capacitance and fast response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3_A/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free molding compound. | Suitable for commercial-grade industrial designs where halogen-free certification is not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is optional. |
| SMBJ85CAHM3_B/I | Identical specifications and construction; differs only in packaging format (3200-piece 13" reel vs. 750-piece 7" reel). | No functional or application difference; purely logistics-driven selection for high-volume SMT line feeding. | Choose for large-batch production runs requiring extended reel life and reduced changeover frequency. |
Compared with SMBJ85CAHM3_A/H, the HE3 variant lacks halogen-free compliance and AEC-Q101 qualification, making it less suitable for automotive or green-certified industrial systems; the HM3_B/I offers identical performance but optimized for high-throughput placement via larger reels.
Availability
SMBJ85CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom base station power feeds requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ85CAHM3_A/H 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for robust transient suppression in harsh environments-targeting industrial automation, automotive electronics, and infrastructure equipment where failure resilience and regulatory compliance are critical.
FAQ
What is the clamping voltage of SMBJ85CAHM3_A/H at its rated peak pulse current?
The SMBJ85CAHM3_A/H has a maximum clamping voltage (VC) of 137 V when subjected to its specified peak pulse current (IPPM) of 4.4 A under the 10/1000 μs waveform condition. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream components during surge events. The SMBJ85CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ85CAHM3_A/H suitable for automotive applications?
Yes, SMBJ85CAHM3_A/H is AEC-Q101 qualified and halogen-free, making it suitable for automotive applications such as body control modules, infotainment power supplies, and sensor interface protection. Its bidirectional architecture, 150 °C maximum junction temperature, and MSL Level 1 rating align with automotive manufacturing and reliability requirements. The SMBJ85CAHM3_A/H meets ISO 7637-2 test criteria when implemented with proper PCB layout.
How does the bidirectional design of SMBJ85CAHM3_A/H affect its use in circuit protection?
The bidirectional design of SMBJ85CAHM3_A/H allows it to protect AC-coupled or differential signal paths-such as RS-485, CAN, or audio lines-without regard to polarity. Unlike unidirectional TVS diodes, SMBJ85CAHM3_A/H triggers symmetrically in both directions, eliminating the need for dual-device configurations or orientation-sensitive placement. This simplifies layout and reduces BOM count while maintaining full surge immunity.
What is the thermal resistance of SMBJ85CAHM3_A/H, and how does it impact power dissipation?
SMBJ85CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. This value determines steady-state temperature rise under continuous power dissipation; however, the device is primarily rated for transient (not continuous) power handling. Its 5.0 W power dissipation rating applies only at TA = 50 °C with infinite heatsink conditions-real-world PCB layout must be verified per Vishay's thermal guidelines for SMBJ85CAHM3_A/H.
Does SMBJ85CAHM3_A/H require special PCB layout considerations for optimal surge performance?
Yes, SMBJ85CAHM3_A/H requires short, wide traces to minimize inductance between the device and protected node-especially critical for high-di/dt transients. Vishay specifies mounting on 0.2" × 0.2" copper pads per terminal to achieve rated 600 W pulse power. Thermal vias under pads improve heat spreading, and ground-plane proximity enhances return-path integrity. These layout practices directly affect the SMBJ85CAHM3_A/H clamping effectiveness and reliability under repeated surges.
SMBJ85CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ85CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3_A/H 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_A/H reliable?
The price and inventory of SMBJ85CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3_A/H?
SMBJ85CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3_A/H 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_A/H?
For technical support, including SMBJ85CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ85CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3_A/H?
All SMBJ85CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHM3_A/H Tags
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