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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3_B/I
- Part No.:
- SMB8J40CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3_B/I.pdf
- Description:
- 800W,40V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
SMB8J40CAHE3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J40CAHE3_B/I datasheet, SMB8J40CAHE3_B/I pinout, SMB8J40CAHE3_B/I application, or SMB8J40CAHE3_B/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 150 °C junction temperature rating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional architecture enables symmetric clamping above ±44.4 V breakdown (VBR), with leakage current ≤1.0 µA at 40 V stand-off.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA - ensures reliable turn-on within specified tolerance band |
| VC @ IPPM | 64.5 V at 12.4 A - limits downstream voltage stress during 10/1000 µs surge events |
| PPPM | 800 W - energy-handling capacity for bidirectional transients per standard waveform |
| ID @ VWM | ≤1.0 µA - minimal leakage preserves signal integrity and system quiescent current |
| TJ max | +150 °C - supports under-hood automotive environments without derating |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with IPC-7351B standard pad layout |
Pinout & Package
SMB8J40CAHE3_B/I is housed in an SMB (DO-214AA) plastic package with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking is present on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as cathode or anode depending on transient polarity - no fixed polarity assignment |
| Case (body) | Non-electrical mechanical interface | Plastic molding provides UL 94 V-0 flammability rating and thermal path to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Enables stable VBR over lifetime and improved moisture resistance vs. epoxy-passivated alternatives |
| MSL Level 1 rating | Allows unlimited floor life and reflow up to 260 °C peak without preconditioning |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| Automated placement compatibility | Low-profile SMB package supports high-speed pick-and-place with ≥0.084" terminal spacing |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Clamps transients to ≤64.5 V while sustaining 800 W peak power, preserving signal integrity and meeting AEC-Q100 stress test requirements. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V DC input channels, coordinated with upstream fusing and filtering. Use Value: Withstands repeated 1 kV/500 A surge events per IEC 61000-4-5 (Level 4) when mounted on 5 mm × 5 mm copper pads. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Surge protection on Ethernet PHY power rails (e.g., PoE injectors) and RS-485 data line terminations. IC Role / Device Role / Timing Role: Secondary-level clamping device after gas discharge tube (GDT) primary suppression, handling residual fast-rising transients. Use Value: Sub-ns response time and 12.4 A IPPM capability ensure coordination with upstream GDTs without let-through voltage overshoot. | Use Scenario: Input-stage transient suppression in AC/DC adapters for smart home devices exposed to mains-borne surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to absorb differential-mode surges before rectification stage. Use Value: 40 V VWM aligns with 36–42 V DC bus range post-bridge rectifier; RoHS-compliant HE3 suffix ensures compliance for global consumer markets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J40CAHM3_B/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification | Required where halogen-free material compliance is mandated (e.g., EU public infrastructure projects) | Select SMB8J40CAHM3_B/I when halogen-free composition is contractually required; otherwise SMB8J40CAHE3_B/I offers standard RoHS compliance. |
| SMBJ40CA-E3/52 | Commercial-grade (non-AEC-Q101), same VWM/VC/IPPM but lower reliability screening | Suitable for non-automotive industrial or consumer applications with less stringent qualification needs | Choose SMBJ40CA-E3/52 for cost-sensitive designs where AEC-Q101 is not mandatory and volume procurement favors standard commercial tape/reel packaging. |
Compared with SMB8J40CAHE3_B/I, SMB8J40CAHM3_B/I adds halogen-free compliance without trade-offs in surge rating or temperature range, while SMBJ40CA-E3/52 reduces qualification rigor and cost for non-automotive use cases - enabling tiered sourcing based on end-equipment requirements.
Availability
SMB8J40CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter input stages requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J40CAHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J40CAHE3_B/I at its rated peak pulse current?
The SMB8J40CAHE3_B/I has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 12.4 A under the standard 10/1000 µs waveform. This value is measured at 25 °C ambient and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMB8J40CAHE3_B/I suitable for automotive applications?
Yes, SMB8J40CAHE3_B/I is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It meets stress test requirements including temperature cycling, high-temperature reverse bias (HTRB), and ESD immunity, and is rated for operation from –55 °C to +150 °C - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces.
How does the bidirectional configuration of SMB8J40CAHE3_B/I affect its circuit implementation?
The bidirectional configuration of SMB8J40CAHE3_B/I means it conducts equally in both polarities above ±44.4 V breakdown, eliminating need for polarity-aware placement. Unlike unidirectional TVS diodes, SMB8J40CAHE3_B/I has no cathode band marking and functions identically regardless of orientation - simplifying layout and reducing assembly errors in AC-coupled or differential signal paths.
What is the thermal resistance profile of SMB8J40CAHE3_B/I, and how does it impact PCB layout?
SMB8J40CAHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To achieve rated 800 W pulse power, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - underscoring the necessity of adequate copper area and thermal vias for sustained surge duty cycles.
Does SMB8J40CAHE3_B/I require special handling or moisture sensitivity precautions?
No - SMB8J40CAHE3_B/I is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be reflowed at peak temperatures up to 260 °C without baking or dry-pack requirements. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, supporting standard SMT assembly processes without special handling protocols.
SMB8J40CAHE3_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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J40CAHE3_B/I FAQ
1.How can I place an order for SMB8J40CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3_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 SMB8J40CAHE3_B/I reliable?
The price and inventory of SMB8J40CAHE3_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 SMB8J40CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3_B/I?
SMB8J40CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3_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 SMB8J40CAHE3_B/I?
For technical support, including SMB8J40CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J40CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3_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 SMB8J40CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3_B/I?
All SMB8J40CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3_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 SMB8J40CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHE3_B/I Tags
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