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Vishay General Semiconductor - Diodes Division SMB8J40C-E3/52
- Part No.:
- SMB8J40C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40C-E3/52.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,898
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Product details
Overview
SMB8J40C-E3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) 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 SMB8J40C-E3/52 datasheet, SMB8J40C-E3/52 pinout, SMB8J40C-E3/52 application, or SMB8J40C-E3/52 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and thermal resistance (RθJA = 72 °C/W) under PCB pad-limited conduction.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 44.4–49.1 V at 1 mA test current and clamps transients to ≤64.5 V at 12.4 A. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), meeting ANSI/IEEE C62.35 standards for surge immunity.
Designed for surface-mount automation, it complies with MSL level 1 (JEDEC J-STD-020), withstands 260 °C reflow peak, and supports AEC-Q101 stress testing - confirming suitability for automotive ECUs and harsh-environment industrial controllers where repeatable surge suppression is critical.
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 mA - Ensures reliable turn-on margin above system operating voltage |
| VC @ IPPM | 64.5 V at 12.4 A - Clamping voltage limits downstream IC stress during 800 W surge events |
| PPPM | 800 W (10/1000 µs) - Sustains high-energy transients common in automotive load-dump and inductive switching |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves signal integrity on high-impedance sensor lines |
| RθJA | 72 °C/W - Requires minimum 5.0 mm × 5.0 mm copper pads per terminal for thermal derating compliance |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
DO-214AA (SMB) package: surface-mount, bi-directional device with no polarity marking; cathode band absent per bi-directional configuration. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with 2.13 mm lead width and 5.59 mm overall length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | Both terminals serve identical clamping function - no DC polarity dependency; connects across protected line and ground or differential pair |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates robustness for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift over temperature and lifetime |
| MSL Level 1 rating | Supports standard SMT reflow without moisture sensitivity handling - reduces manufacturing overhead |
| RoHS-compliant matte tin leads | Guarantees solderability per J-STD-002 and whisker resistance per JESD201 Class 1A (E3 suffix) |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from ESD and load-dump surges in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed directly at connector entry point to clamp ±64.5 V transients before reaching PHY or ADC front-end. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V interface ICs during ISO 7637-2 Pulse 1/2/5a events. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS across 24 V DC input terminals to divert >12 A surge current away from optocoupler input stage. Use Value: Maintains functional safety integrity by limiting voltage seen by upstream isolation barrier to <65 V during 800 W transients. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Surge protection on Ethernet PHY magnetics secondary side or RS-485 data lines exposed to external cabling. IC Role / Device Role / Timing Role: Bi-directional clamping element referenced to local ground, absorbing differential-mode transients up to 12.4 A. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) without additional series impedance or filtering complexity. |
Use Scenario: Secondary-side transient suppression on 5–24 V DC outputs of wall adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage protector after DC-DC regulation, shunting fast-rising spikes from capacitive load switching or cable disconnect events. Use Value: Limits output voltage overshoot to ≤64.5 V, preventing overvoltage damage to USB-PD controllers or PMICs downstream. |
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 DO-214AA package and 40 V VWM, but rated for 600 W PPPM (vs. 800 W) and higher VC (69.4 V @ 10.3 A) | Limited to lower-energy surge environments; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification or 800 W headroom requirements |
| SMCJ40CA-E3/52 | DO-214AB (SMC) package, same 40 V VWM, 1500 W PPPM rating, and 64.5 V VC - larger footprint and higher thermal mass | Better suited for high-reliability industrial power rails where board space permits larger package | Choose when system-level surge tests exceed 800 W or junction temperature rise must be minimized via larger copper area |
Compared with SMBJ40CA-E3/52 and SMCJ40CA-E3/52, SMB8J40C-E3/52 delivers higher surge power handling than SMBJ while maintaining compact SMB footprint, and offers AEC-Q101 validation unavailable in SMBJ - making it optimal for space-constrained automotive nodes requiring certified robustness.
Availability
SMB8J40C-E3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply across production lifecycles.
Supply support for SMB8J40C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered for high-power-density transient suppression in automotive, industrial, and communications systems where compact size and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMB8J40C-E3/52 under maximum rated surge current?
The SMB8J40C-E3/52 clamps to a maximum of 64.5 V when subjected to its rated peak pulse current of 12.4 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMB8J40C-E3/52 suitable for automotive applications?
Yes, SMB8J40C-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its glass-passivated junction, MSL Level 1 reflow compatibility, and validated performance across -55 °C to +150 °C operating range meet stringent automotive reliability requirements - confirmed in Vishay Document Number 88422.
How does the bi-directional configuration of SMB8J40C-E3/52 affect its placement on PCB?
The SMB8J40C-E3/52 has no polarity marking and functions identically in either orientation, simplifying layout and eliminating risk of reverse installation. It is placed symmetrically across the protected line and reference plane (e.g., differential pair or AC-coupled signal), enabling single-device protection without directionality constraints - unlike uni-directional variants such as SMB10J40A.
What is the thermal resistance of SMB8J40C-E3/52, and how does it impact layout design?
SMB8J40C-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain safe junction temperature during repeated surges, PCB layout must allocate sufficient copper area and avoid thermal bottlenecks - undersized pads will cause premature thermal derating and reduced surge endurance.
Does SMB8J40C-E3/52 meet RoHS and lead-free soldering requirements?
Yes, SMB8J40C-E3/52 carries the "E3" suffix indicating RoHS-compliance and matte tin-plated leads qualified for lead-free reflow per J-STD-020 (peak 260 °C). It also passes JESD201 Class 1A whisker testing, ensuring long-term solder joint integrity in high-reliability applications without requiring special handling or storage protocols.
SMB8J40C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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)
SMB8J40C-E3/52 FAQ
1.How can I place an order for SMB8J40C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40C-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 SMB8J40C-E3/52 reliable?
The price and inventory of SMB8J40C-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 SMB8J40C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J40C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40C-E3/52?
SMB8J40C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40C-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 SMB8J40C-E3/52?
For technical support, including SMB8J40C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40C-E3/52 requirements.
6.How does Aetrix verify that SMB8J40C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J40C-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 SMB8J40C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J40C-E3/52?
All SMB8J40C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40C-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 SMB8J40C-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J40C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40C-E3/52 Tags
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