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Vishay General Semiconductor - Diodes Division SMB8J40CA-E3/52
- Part No.:
- SMB8J40CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CA-E3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,088
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Product details
Overview
SMB8J40CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 μs waveform - used to safeguard automotive sensor interfaces and industrial I/O circuits against ESD and load-switching transients.
For engineers reviewing the SMB8J40CA-E3/52 datasheet, SMB8J40CA-E3/52 pinout, SMB8J40CA-E3/52 application, or SMB8J40CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, RoHS-compliant E3 termination, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 40 V), then rapidly switches to low-impedance conduction when transient voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed per ANSI/IEEE C62.35 standards, SMB8J40CA-E3/52 delivers 800 W peak pulse power handling with 10/1000 μs waveform, derated linearly above 25 °C ambient (RθJA = 72 °C/W), and supports operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 49.1 V at 1 mA test current - defines reliable breakdown threshold window |
| VC @ IPPM | 64.5 V at 12.4 A - clamping voltage limiting protected circuit stress during 10/1000 μs surge |
| PPPM | 800 W - peak transient energy absorption capacity under standardized surge waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power impact on sensitive inputs |
| TJ max | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or floating signal line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (1) | Transient current path input | Either terminal accepts surge current; bidirectional symmetry eliminates orientation constraints during layout |
| Anode/Cathode (2) | Transient current path output | Completes low-impedance shunt path to ground or rail; requires minimum 0.2" × 0.2" copper pad per terminal for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC signals and floating buses without polarity sensitivity - ideal for CAN, LIN, and sensor differential pairs |
| AEC-Q101 qualification | Validated for automotive electronics including engine control modules and ADAS sensor interfaces |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| RoHS-compliant E3 termination | Matte tin plating meets J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine bay environments subject to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Shunt TVS device placed directly at connector entry point to clamp surges before reaching signal conditioning IC. Use Value: Limits transient voltage to ≤64.5 V while sustaining 800 W surge energy - prevents latch-up or gate oxide damage in downstream op-amps and ADCs. |
Use Scenario: Safeguarding 24 V digital input channels on PLC modules exposed to relay coil flyback and field wiring faults. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across input terminals to divert both positive and negative polarity surges to common reference. Use Value: Enables robust 24 V DC input stage design with <1 μA leakage at rated VWM - avoids false triggering in high-impedance sensing circuits. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Transient suppression on RS-485 bus lines in outdoor telecom cabinets subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary protection element placed before TVS array or integrated protection IC to absorb bulk surge energy. Use Value: Withstands 12.4 A peak pulse current and maintains clamping below 65 V - preserves signal integrity and prevents receiver IC damage. |
Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing IEC 61000-4-2 ±15 kV contact discharge energy before reaching USB transceiver. Use Value: Sub-1 ns response time and 64.5 V clamping ensure transceiver IO pins remain within absolute maximum ratings during ESD events. |
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 PPPM (600 W vs. 800 W) and higher VC (69.4 V vs. 64.5 V) at rated IPPM | Less margin for high-energy transients; suitable only where surge amplitude is well-characterized and lower | Select SMB8J40CA-E3/52 when full 800 W surge rating and tighter clamping are required for automotive or industrial compliance. |
| SMCJ40CA-E3/52 | Larger SMC (DO-214AB) package, same 40 V VWM, higher PPPM (1500 W), lower RθJA (30 °C/W), and identical VC (64.5 V) | Requires larger PCB footprint and different pad layout; better thermal performance for repeated surge events | Choose SMB8J40CA-E3/52 for space-constrained designs needing AEC-Q101 qualification and SMB footprint compatibility. |
Compared with SMBJ40CA-E3/52 and SMCJ40CA-E3/52, SMB8J40CA-E3/52 delivers superior power density (800 W in SMB) and automotive qualification without footprint penalty - making it optimal for next-generation compact, high-reliability sensor nodes.
Availability
SMB8J40CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMB8J40CA-E3/52 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
SMB8J40CA-E3/52 belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes engineered for robust transient suppression in automotive, industrial, and communications systems where space, thermal performance, and qualification rigor are critical.
FAQ
What is the clamping voltage of SMB8J40CA-E3/52 and how is it measured?
The SMB8J40CA-E3/52 has a maximum clamping voltage (VC) of 64.5 V, measured at 12.4 A peak pulse current (IPPM) using a 10/1000 μs double-exponential surge waveform. This value represents the upper limit of voltage seen by downstream circuitry during standardized transient events, ensuring protected components remain within safe operating limits. The SMB8J40CA-E3/52 achieves this clamping performance while maintaining low incremental surge resistance.
Is SMB8J40CA-E3/52 qualified for automotive applications?
Yes, SMB8J40CA-E3/52 is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. Its qualification applies specifically to the HE3/HM3 automotive ordering variants; however, the E3/52 commercial version shares identical die and construction, and Vishay documents its suitability for automotive use when specified with appropriate suffixes. The SMB8J40CA-E3/52 meets requirements for engine control, body electronics, and ADAS sensor interfaces.
What is the difference between SMB8J40CA-E3/52 and SMBJ40CA-E3/52?
SMB8J40CA-E3/52 offers 800 W peak pulse power (PPPM) and 64.5 V clamping voltage at 12.4 A, whereas SMBJ40CA-E3/52 provides only 600 W PPPM and clamps at 69.4 V under the same 10/1000 μs waveform. Both use the SMB (DO-214AA) package and share 40 V VWM, but SMB8J40CA-E3/52 delivers higher energy handling and tighter voltage control - critical for meeting stringent ISO 7637-2 pulse 5a requirements. The SMB8J40CA-E3/52 also carries explicit AEC-Q101 qualification in its automotive variants.
Does SMB8J40CA-E3/52 require special PCB layout considerations?
Yes - SMB8J40CA-E3/52 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power and thermal performance. Smaller pads reduce heat dissipation, causing premature thermal runaway during surge events. Trace inductance should also be minimized: keep leads short and direct to ground or return plane. The SMB8J40CA-E3/52 has no polarity marking, so orientation is not critical, but symmetric routing improves bidirectional surge balance.
What is the leakage current specification for SMB8J40CA-E3/52 at its stand-off voltage?
At its 40 V stand-off voltage (VWM), SMB8J40CA-E3/52 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C ambient temperature. This ultra-low leakage ensures minimal loading on high-impedance sensor outputs and analog front-ends, preserving signal accuracy and reducing power loss in battery-operated systems. Leakage remains below 5.0 μA up to +125 °C junction temperature, supporting reliable operation across extended industrial temperature ranges. The SMB8J40CA-E3/52 maintains this performance due to its glass-passivated junction structure.
SMB8J40CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J40CA-E3/52 FAQ
1.How can I place an order for SMB8J40CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CA-E3/52 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 SMB8J40CA-E3/52 reliable?
The price and inventory of SMB8J40CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J40CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CA-E3/52?
SMB8J40CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CA-E3/52 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 SMB8J40CA-E3/52?
For technical support, including SMB8J40CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J40CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J40CA-E3/52 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 SMB8J40CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J40CA-E3/52?
All SMB8J40CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CA-E3/52, 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 SMB8J40CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J40CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CA-E3/52 Tags
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