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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3_B/I
- Part No.:
- SMBJ85CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3_B/I.pdf
- Description:
- 600W,85V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,793
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Product details
Overview
SMBJ85CAHM3_B/I 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 - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ85CAHM3_B/I datasheet, SMBJ85CAHM3_B/I pinout, SMBJ85CAHM3_B/I application, or SMBJ85CAHM3_B/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101 qualified TVS for bidirectional overvoltage protection where low-profile mounting, fast response (<1 ns), and stable clamping under repetitive surge conditions are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling precise clamping without polarity-dependent behavior.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). Its thermal resistance (RθJA = 100 °C/W) and low RθJL = 20 °C/W support reliable operation on standard 0.2" × 0.2" copper pads without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against lightning-induced surges. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at rated standoff; preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient industrial and automotive under-hood environments. |
| Package | SMB (DO-214AA) - Low-profile SMD outline (5.21 mm × 4.06 mm × 2.20 mm); compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both ends function identically under transient stress.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (End 1) | Transient current entry (reverse bias) | Accepts surge current during negative-going transients; forms one half of symmetrical clamping path. |
| Cathode (End 2) | Transient current entry (forward bias) | Accepts surge current during positive-going transients; completes bidirectional conduction path with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout or external series components. |
| 600 W peak pulse power | Rated per 10/1000 µs waveform at 0.01% duty cycle - withstands repeated ESD and lightning-surge events without degradation. |
| Halogen-free & RoHS-compliant | HM3 suffix indicates halogen-free molding compound and full RoHS compliance - meets environmental requirements for consumer and industrial products. |
| AEC-Q101 qualified | Qualified for automotive applications per AEC-Q101 - validated for reliability under temperature cycling, humidity, and mechanical stress. |
| Fast response time | <1 ns typical - activates before sensitive downstream circuitry (e.g., MCU I/O, RS-485 transceivers) sustains damage. |
Applications
| Industrial Sensor Interface Protection | Telecom Line Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog and digital sensor outputs (e.g., 4–20 mA loops, CAN bus nodes) from inductive switching spikes and ESD in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pairs or supply rails to limit transient excursions. Use Value: Maintains signal fidelity by clamping surges to ≤137 V while drawing only <1 µA leakage at 85 V nominal rail - no loading effect on precision sensing. |
Use Scenario: Shielding RS-232/RS-485 data lines in base station equipment and network switches from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary front-end TVS on twisted-pair data lines, operating in parallel with GDT or MOV secondary protection stages. Use Value: Delivers sub-1 ns response and symmetrical clamping to preserve signal timing integrity and prevent receiver latch-up during multi-kV transients. |
| Automotive Body Control Module (BCM) | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding LIN bus and switched 12 V supply inputs in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS on battery-fed rails, absorbing energy from 12 V system transients without crowbarring. Use Value: AEC-Q101 qualification and 150 °C TJ rating ensure operational reliability across -40 °C to +125 °C ambient, meeting automotive lifecycle demands. |
Use Scenario: Input-stage transient suppression in AC-DC adapters for smart home devices, guarding bridge rectifier outputs against mains-borne surges. IC Role / Device Role / Timing Role: Secondary-level TVS after fuse and MOV, providing precise clamping where MOV tolerance drift would risk overvoltage. Use Value: Tight VBR tolerance (94.4–104 V) and stable VC enable consistent protection margin across production lots - critical for safety certification. |
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_B/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks halogen-free certification; acceptable where environmental compliance excludes halogen restrictions. | Select when halogen-free requirement is not mandated, and cost optimization is prioritized over material specification. |
| SMAJ85CAHM3_A/H | Lower PPPM (400 W), larger VC (145 V), same VWM/VBR; SMA (DO-214AC) package (smaller footprint, lower power). | Reduced surge handling; suitable only for lower-energy threat environments (e.g., IEC 61000-4-2 ESD, not lightning). | Choose only if board space is constrained and surge threat level is limited to Class 3/4 ESD - not for IEC 61000-4-5 line surges. |
Compared with SMBJ85CAHM3_B/I, the HE3 variant trades halogen-free status for broader commercial availability, while the SMAJ85CAHM3_A/H sacrifices 33% peak power and higher clamping to fit tighter layouts - neither offers drop-in replacement capability due to differing power ratings or material compliance scope.
Availability
SMBJ85CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter input stages requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMBJ85CAHM3_B/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and communications infrastructure where robust, standardized TVS protection is mission-critical.
FAQ
What is the clamping voltage of SMBJ85CAHM3_B/I at its rated peak pulse current?
The SMBJ85CAHM3_B/I has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 4.4 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures downstream circuitry remains within safe voltage limits during surge events. The SMBJ85CAHM3_B/I achieves this with low incremental resistance and stable junction characteristics.
Is SMBJ85CAHM3_B/I suitable for automotive applications?
Yes, SMBJ85CAHM3_B/I is AEC-Q101 qualified, confirming its suitability for automotive applications including body control modules, infotainment power supplies, and LIN/CAN bus protection. Its construction includes halogen-free, RoHS-compliant materials, and it operates reliably from –55 °C to +150 °C junction temperature. The SMBJ85CAHM3_B/I meets stress test requirements for temperature cycling, humidity, and mechanical shock defined in AEC-Q101.
How does the bidirectional design of SMBJ85CAHM3_B/I affect PCB layout?
The SMBJ85CAHM3_B/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for cathode band alignment or directional routing - especially valuable on differential lines like RS-485 or CAN. The SMBJ85CAHM3_B/I can be mounted in either direction without affecting clamping performance or circuit behavior.
What is the maximum reverse leakage current for SMBJ85CAHM3_B/I at its working voltage?
The SMBJ85CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated standoff voltage (VWM) of 85 V and ambient temperature of 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and avoids unnecessary power drain in battery-operated systems. The SMBJ85CAHM3_B/I maintains this specification across its full operating temperature range.
Does SMBJ85CAHM3_B/I require heatsinking in typical applications?
No, SMBJ85CAHM3_B/I is designed for operation without external heatsinking when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Its thermal resistance (RθJA = 100 °C/W) and low RθJL = 20 °C/W allow safe dissipation of its 5.0 W steady-state power rating and transient energy under standard PCB conditions. The SMBJ85CAHM3_B/I's SMB package efficiently transfers heat to the board via its leads and metallized end caps.
SMBJ85CAHM3_B/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:
- -
- 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 (SMB)
SMBJ85CAHM3_B/I FAQ
1.How can I place an order for SMBJ85CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3_B/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_B/I reliable?
The price and inventory of SMBJ85CAHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3_B/I?
SMBJ85CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3_B/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_B/I?
For technical support, including SMBJ85CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ85CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3_B/I?
All SMBJ85CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHM3_B/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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