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Vishay General Semiconductor - Diodes Division SMB8J40CA-E3/5B
- Part No.:
- SMB8J40CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CA-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,795
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Product details
Overview
SMB8J40CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 800 W peak pulse power (10/1000 μs), 40 V stand-off voltage (VWM), and 64.5 V maximum clamping voltage (VC) at 12.4 A peak pulse current. It protects automotive sensor signal lines, industrial I/O interfaces, and power supply rails against ESD and inductive switching transients.
For engineers reviewing the SMB8J40CA-E3/5B datasheet, SMB8J40CA-E3/5B pinout, SMB8J40CA-E3/5B application, or SMB8J40CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin plating, MSL Level 1 rating, 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, responding within <1 ps to transients exceeding its 44.4–49.1 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior under repetitive surges, while low incremental surge resistance minimizes clamping overshoot during 800 W pulses.
Designed for automotive-grade reliability, SMB8J40CA-E3/5B meets AEC-Q101 stress tests including temperature cycling, HTRB, and ESD (HBM ≥8 kV). Its thermal resistance (RθJA = 72 °C/W) and 150 °C max junction temperature support operation in engine control units and ADAS sensor modules without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal rail margin. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V - Clamping voltage at 12.4 A peak pulse current (10/1000 μs); limits protected circuit voltage stress during surge. |
| PPPM | 800 W - Peak pulse power handling (10/1000 μs waveform); supports IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | 1.0 μA - Reverse leakage at 40 V; negligible power loss and signal distortion in high-impedance sensor interfaces. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| MSL Level | Level 1 (per J-STD-020) - No floor life limitation; compatible with standard reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking; case dimensions 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bidirectional conduction - either terminal serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; mounted on 5.0 mm × 5.0 mm copper pads per terminal for optimal thermal dissipation and surge current handling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and ADAS sensors; includes HTOL, TC, and ESD testing per stress requirements. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature; eliminates parameter drift due to moisture or contamination. |
| Low profile SMB package | Height ≤ 2.20 mm - enables compact PCB layout in space-constrained modules such as camera ECUs and radar front-ends. |
| RoHS-compliant & halogen-free option | E3 suffix denotes RoHS compliance; HM3 variant available for halogen-free requirements without performance trade-offs. |
| Fast response time | <1 ps - clamps transients before sensitive ICs (e.g., CAN transceivers, ADCs) experience overvoltage damage. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to divert surge energy away from MCU analog inputs and LIN transceivers. Use Value: Limits voltage to ≤64.5 V during 800 W surges, preventing latch-up or permanent damage to 5 V/12 V sensor signal chains. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Bidirectional clamping element across 24 V DC input terminals, absorbing repetitive 10/1000 μs transients up to 12.4 A. Use Value: Maintains system uptime by eliminating false triggering and component failure caused by >1 kV switching transients. |
| Telecom Power Supply Rail | Consumer Device USB Port |
Use Scenario: Protecting 48 V intermediate bus in telecom base station power supplies against lightning-induced surges entering via AC mains or Ethernet ports. IC Role / Device Role / Timing Role: Primary-stage TVS on DC-DC converter input, coordinated with MOVs and gas discharge tubes for multi-level surge suppression. Use Value: Withstands 800 W pulses without degradation, enabling compliance with ITU-T K.20 and IEC 61000-4-5 Ed. 3. | Use Scenario: ESD and surge protection for USB 2.0 data lines and VBUS in portable audio devices and smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to USB connector to suppress ±15 kV contact ESD (IEC 61000-4-2) and cable discharge events. Use Value: 1.0 μA leakage at 40 V prevents signal integrity issues on high-speed differential pairs while providing robust clamping. |
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-E3/5B | Same SMB package, identical VWM (40 V) and VC (64.5 V), but rated for 1000 W unidirectional only; bidirectional version not offered in SMBJ series. | Not suitable for symmetric AC-coupled or dual-polarity signal lines requiring true bidirectional clamping. | Select SMB8J40CA-E3/5B when bidirectional protection is mandatory and 800 W rating suffices. |
| SMCJ40CA-E3/57T | Higher 1500 W PPPM rating in larger SMC (DO-214AB) package; same VWM (40 V), slightly higher VC (69.4 V at 21.5 A). | Better suited for higher-energy surges but requires larger PCB area and may not fit tight automotive sensor housings. | Choose SMCJ40CA-E3/57T only if system-level surge testing exceeds 800 W and board space allows SMC footprint. |
Compared with SMBJ40CA-E3/5B and SMCJ40CA-E3/57T, SMB8J40CA-E3/5B uniquely balances AEC-Q101 qualification, bidirectional operation, and SMB footprint-making it optimal for space-constrained automotive and industrial signal-line protection where 800 W surge immunity is sufficient.
Availability
SMB8J40CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and RoHS-conformant manufacturing.
Supply support for SMB8J40CA-E3/5B 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.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-reliability bidirectional surge suppression in automotive, industrial, and telecom infrastructure where compact size and AEC-Q101 validation are critical.
FAQ
What is the clamping voltage of SMB8J40CA-E3/5B at its rated peak pulse current?
The SMB8J40CA-E3/5B has a maximum clamping voltage (VC) of 64.5 V at its specified peak pulse current (IPPM) of 12.4 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value ensures protected downstream components remain within safe voltage limits during transient events, and is confirmed in the Vishay datasheet Document Number 88422, page 3 (Bidirectional Electrical Characteristics table).
Is SMB8J40CA-E3/5B suitable for automotive applications?
Yes, SMB8J40CA-E3/5B is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering code system (HE3/HM3 suffix variants). Its construction-including glass-passivated junction, MSL Level 1 rating, and operation up to +150 °C junction temperature-meets automotive environmental and reliability requirements for use in engine control units, ADAS sensors, and body electronics modules.
What does the "-E3/5B" suffix indicate in SMB8J40CA-E3/5B?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/5B" specifies packaging in 13-inch diameter plastic tape and reel containing 3200 units. This format supports high-volume automated SMT assembly and complies with J-STD-002 solderability standards and JESD 201 Class 2 whisker resistance testing.
How does SMB8J40CA-E3/5B differ from unidirectional TVS diodes like SMB10J40A?
SMB8J40CA-E3/5B is bidirectional with symmetrical clamping for AC or dual-polarity signals, whereas SMB10J40A is unidirectional and conducts only in reverse bias. SMB8J40CA-E3/5B delivers 800 W peak pulse power, while SMB10J40A offers 1000 W-but only in one direction. The "C" in SMB8J40CA confirms bidirectionality, critical for protecting differential buses or transformer-coupled interfaces.
What is the thermal resistance of SMB8J40CA-E3/5B, and how does it affect PCB layout?
SMB8J40CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must adhere to this pad layout-reducing copper area increases RθJA and risks thermal runaway. The datasheet specifies this geometry as minimum for rated power dissipation.
SMB8J40CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMB8J40CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CA-E3/5B 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-E3/5B reliable?
The price and inventory of SMB8J40CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J40CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CA-E3/5B?
SMB8J40CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CA-E3/5B 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-E3/5B?
For technical support, including SMB8J40CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J40CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J40CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J40CA-E3/5B?
All SMB8J40CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J40CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CA-E3/5B Tags
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