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Vishay General Semiconductor - Diodes Division SMB8J40CAHE3/52
- Part No.:
- SMB8J40CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHE3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,961
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Product details
Overview
SMB8J40CAHE3/52 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 SMB8J40CAHE3/52 datasheet, SMB8J40CAHE3/52 pinout, SMB8J40CAHE3/52 application, or SMB8J40CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, 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 stable breakdown behavior. Its bidirectional architecture enables symmetric clamping across both polarities without external polarity management.
Designed per ANSI/IEEE C62.35 standards, it delivers repeatable surge suppression under repetitive 10/1000 µs waveforms while maintaining ≤1.0 µA reverse leakage at 40 V and thermal resistance of 72 °C/W (junction-to-ambient) on standard PCB pad layout.
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 - guaranteed breakdown threshold range for reliable trigger margin |
| VC @ IPPM | 64.5 V at 12.4 A - clamping voltage limiting downstream circuit stress during 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capacity under standardized surge waveform |
| TJ max | +150 °C - extended thermal operating range supporting under-hood automotive use |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm height and 3.94 mm length for space-constrained layouts |
Pinout & Package
Two-terminal SMB (DO-214AA) package with no polarity marking for bidirectional operation; terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, rated MSL level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Surge current path | Reversible conduction path enabling symmetrical clamping in either direction |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary thermal conduction path to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, ADAS sensors, and body electronics |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns or baking requirements |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
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 inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to limit transient energy before reaching signal conditioning ICs. Use Value: Clamps 800 W surges at ≤64.5 V while maintaining <1 µA leakage at 40 V, preserving signal integrity and preventing false triggering in 12 V systems. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against ESD and field-wiring induced surges in factory automation environments. 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 10/1000 µs surges up to 12.4 A without degradation, extending module service life in electrically noisy plant floors. |
| Telecom Power Line Protection | Consumer Appliance Motor Control |
Use Scenario: Secondary-side surge protection on 48 V PoE-powered equipment (e.g., IP cameras, access points) exposed to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after isolation transformer but before DC-DC converter input. Use Value: 40 V VWM aligns with PoE+ nominal voltage; 64.5 V VC ensures downstream regulator remains within absolute maximum ratings during surge events. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive kickback energy. Use Value: 800 W PPPM rating handles typical motor turn-off energy; AEC-Q101 qualification supports long-term reliability under thermal cycling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/52 | Same SMB package and 40 V VWM, but lower 600 W PPPM rating and non-AEC-Q101 commercial grade | Limited to non-automotive industrial or consumer use where qualification is not required | Select when cost sensitivity outweighs automotive qualification needs and surge energy stays below 600 W |
| SMCJ40CAHE3_A/H | Higher 1500 W PPPM rating in larger SMC (DO-214AB) package; same VWM and AEC-Q101 qualification | Requires PCB layout change due to 7.11 mm length vs. SMB's 3.94 mm; suited for higher-energy zones | Choose when system-level surge testing exceeds 800 W or when board space allows larger footprint for margin |
Compared with SMBJ40CA-E3/52 and SMCJ40CAHE3_A/H, SMB8J40CAHE3/52 uniquely balances AEC-Q101 compliance, 800 W surge handling, and compact SMB footprint - making it optimal for space-constrained automotive and industrial edge nodes where qualification and size are co-prioritized.
Availability
SMB8J40CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power line protection, and consumer appliance motor control requiring stable component supply and full traceability.
Supply support for SMB8J40CAHE3/52 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 SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial systems.
FAQ
What is the clamping voltage of SMB8J40CAHE3/52 at its rated peak pulse current?
The SMB8J40CAHE3/52 has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 12.4 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe voltage limits during standardized surge events. The SMB8J40CAHE3/52 maintains this clamping performance across its full operating temperature range.
Is SMB8J40CAHE3/52 suitable for automotive applications?
Yes, SMB8J40CAHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and surge endurance validation per automotive reliability standards. The SMB8J40CAHE3/52 is commonly deployed in engine control units, ADAS sensor interfaces, and body control modules where robust transient immunity is mandatory.
What is the standoff voltage rating of SMB8J40CAHE3/52 and how does it relate to system voltage?
The SMB8J40CAHE3/52 has a stand-off voltage (VWM) of 40 V, meaning it remains non-conductive up to this DC or RMS voltage level. This rating is selected to exceed nominal system voltages - such as 24 V industrial rails or 36 V automotive battery transients - while providing sufficient margin below the 44.4 V minimum breakdown voltage. The SMB8J40CAHE3/52 thus avoids leakage or false triggering during normal operation while responding promptly to overvoltage events.
Does SMB8J40CAHE3/52 have polarity markings, and how is it mounted on PCB?
No, SMB8J40CAHE3/52 is a bidirectional TVS diode and carries no cathode band or polarity marking - both terminals are functionally identical. It is mounted in SMB (DO-214AA) package using standard SMT reflow with matte tin-plated leads compliant with J-STD-002. Recommended pad layout is 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal to ensure thermal dissipation and surge current handling per datasheet fig. 2. The SMB8J40CAHE3/52 requires no orientation verification during placement.
How does the 800 W peak pulse power rating of SMB8J40CAHE3/52 compare to similar SMB-package TVS diodes?
The SMB8J40CAHE3/52 delivers 800 W peak pulse power (PPPM) under 10/1000 µs waveform - among the highest for SMB (DO-214AA) packaged bidirectional TVS diodes. Most competing SMB devices (e.g., SMBJ40CA) offer only 600 W. This 33% higher rating enables the SMB8J40CAHE3/52 to handle more energetic transients without derating, especially critical in automotive load-dump scenarios. The SMB8J40CAHE3/52 achieves this via optimized chip geometry and low Rsurge, verified in Vishay document 88422.
SMB8J40CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J40CAHE3/52 FAQ
1.How can I place an order for SMB8J40CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHE3/52 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 SMB8J40CAHE3/52 reliable?
The price and inventory of SMB8J40CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHE3/52?
SMB8J40CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHE3/52 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 SMB8J40CAHE3/52?
For technical support, including SMB8J40CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J40CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHE3/52 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 SMB8J40CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHE3/52?
All SMB8J40CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHE3/52, 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 SMB8J40CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J40CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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