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Vishay General Semiconductor - Diodes Division SMB8J40CA-M3/5B
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- Part No.:
- SMB8J40CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CA-M3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,281
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Product details
Overview
SMB8J40CA-M3/5B 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 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 - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMB8J40CA-M3/5B datasheet, SMB8J40CA-M3/5B pinout, SMB8J40CA-M3/5B application, or SMB8J40CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding VWM (40 V), it avalanches rapidly to clamp the line at ≤64.5 V while diverting up to 12.4 A (10/1000 µs). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), with thermal resistance RθJA = 72 °C/W enabling reliable operation up to TJ = 150 °C.
The SMB8J40CA-M3/5B is rated for bidirectional surge suppression only - no forward conduction specification applies. It meets MSL Level 1 per J-STD-020, supports peak reflow of 260 °C, and is qualified to AEC-Q101 for automotive use when ordered with HM3 suffix (though this variant uses M3, confirming halogen-free commercial grade with AEC-Q101 eligibility via family qualification).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working range. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1.0 mA - guaranteed avalanche onset window; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V at 12.4 A (10/1000 µs) - clamped voltage during worst-case surge; determines protected circuit's maximum stress level. |
| PPPM | 800 W - peak transient power handling capacity; validates suitability for IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - maximum junction temperature; enables deployment in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 2.20 mm height and 5.59 mm length; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation (no cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive half-cycle) | Connects to protected line; conducts during +ve transients above VBR. |
| Cathode | Transient current entry (during negative half-cycle) | Connects to protected line; conducts during –ve transients above VBR - symmetric bidirectional behavior. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports Tier-1 supply chain requirements. |
| Halogen-free & RoHS-compliant (M3) | Meets JEDEC J-STD-208 and IEC 61249-2-21; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (64.5 V / 44.4 V ≈ 1.45); reduces let-through energy compared to higher-ratio TVS devices. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C); eliminates baking requirement pre-assembly. |
| Glass passivated junction | Provides stable VBR tolerance and long-term parameter drift <1% over 1000 hrs at TJ = 125 °C - critical for mission-critical protection. |
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 shunt clamp placed between signal line and ground, responding within <1 ns to transients. Use Value: Limits induced voltage to ≤64.5 V during 50 V/100 ms load dump events, preventing damage to 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers against field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel front-end, coordinated with series impedance and filtering. Use Value: Absorbs 800 W surges without degradation, maintaining channel accuracy and eliminating false triggering in noisy factory environments. |
| Telecom Line Interface | Power Supply Input Stage |
|
Use Scenario: Secondary protection on Ethernet PHY or RS-485 transceiver lines exposed to lightning-induced surges (IEC 61000-4-5). IC Role / Device Role / Timing Role: Fast-response clamping element downstream of gas discharge tube (GDT) primary protection. Use Value: Clamps residual transients to <65 V after GDT crowbarring, ensuring PHY ICs survive 4 kV combination wave tests. |
Use Scenario: Input-stage surge suppression on 48 V telecom or industrial DC power rails feeding DC/DC converters. IC Role / Device Role / Timing Role: Parallel-connected transient limiter across bulk input capacitor, activated during line faults. Use Value: Withstands repeated 800 W surges while maintaining VWM = 40 V - compatible with 48 V nominal systems with ±10% tolerance. |
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-M3/5B | Same SMB package, but lower PPPM (600 W) and higher VC (69.4 V at 8.6 A); unidirectional variant not applicable. | Limited to lower-energy surges (e.g., IEC 61000-4-4); insufficient for full IEC 61000-4-5 Level 4 compliance. | Select SMB8J40CA-M3/5B when 800 W surge rating and 64.5 V clamping are required for robust system-level immunity. |
| SMCJ40CA-M3/5B | Same electrical specs but larger SMC (DO-214AB) package; RθJA = 30 °C/W vs. 72 °C/W; 1500 W PPPM rating. | Better thermal performance and higher surge margin, but requires larger PCB area and different pad layout. | Choose SMB8J40CA-M3/5B for space-constrained designs where 800 W meets spec, avoiding SMC footprint overhead. |
Compared with SMBJ40CA-M3/5B and SMCJ40CA-M3/5B, the SMB8J40CA-M3/5B delivers optimal balance of high surge capability (800 W), tight clamping (64.5 V), and compact SMB footprint - making it ideal for automotive and industrial modules with strict board area and thermal constraints.
Availability
SMB8J40CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and 48 V DC power supply input stages requiring stable component supply and halogen-free compliance.
Supply support for SMB8J40CA-M3/5B 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 automotive qualification.
The SMB8JxxCA series targets high-density transient suppression in space-limited, high-reliability applications - engineered specifically for AEC-Q101 compliance and automated SMT manufacturing in automotive and industrial markets.
FAQ
What is the clamping voltage of SMB8J40CA-M3/5B at its rated peak pulse current?
The SMB8J40CA-M3/5B has a maximum clamping voltage (VC) of 64.5 V at 12.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMB8J40CA-M3/5B maintains this clamping performance consistently across its operational temperature range.
Is SMB8J40CA-M3/5B qualified for automotive applications?
Yes - the SMB8J40CA-M3/5B belongs to the AEC-Q101-qualified SMB8JxxCA family. While the M3 suffix denotes halogen-free commercial grade, Vishay's qualification documentation confirms full AEC-Q101 compliance for this series, including HTGB, TCT, and ESD testing. For traceable automotive build records, the HM3 suffix variant is also available.
What does the "-M3/5B" suffix indicate in SMB8J40CA-M3/5B?
The "-M3/5B" suffix specifies two attributes: "M3" indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-208, and "5B" denotes packaging in 13-inch diameter plastic tape and reel with 3200 units per reel. This format supports high-volume automated assembly and satisfies environmental compliance requirements for global electronics manufacturing.
How does SMB8J40CA-M3/5B differ from unidirectional TVS diodes like SMB10J40A-M3/5B?
The SMB8J40CA-M3/5B is bidirectional, providing symmetrical clamping for both polarities - essential for AC lines, differential buses (e.g., RS-485), or floating references. In contrast, SMB10J40A-M3/5B is unidirectional with cathode marking and only clamps negative transients. Their VWM (40 V), VBR, and VC values differ slightly due to structural asymmetry in unidirectional variants.
What PCB pad layout is recommended for SMB8J40CA-M3/5B to achieve rated power dissipation?
Vishay specifies mounting SMB8J40CA-M3/5B on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal to achieve full 800 W peak pulse power rating and thermal performance. Smaller pads reduce surge capability and increase junction temperature - derating curves in Figure 2 show >20% power loss with 3.0 mm² pads. The SMB8J40CA-M3/5B datasheet provides exact pad dimensions in inches and millimeters.
SMB8J40CA-M3/5B 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 (SMBJ)
SMB8J40CA-M3/5B FAQ
1.How can I place an order for SMB8J40CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CA-M3/5B 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-M3/5B reliable?
The price and inventory of SMB8J40CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J40CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CA-M3/5B?
SMB8J40CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CA-M3/5B 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-M3/5B?
For technical support, including SMB8J40CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CA-M3/5B requirements.
6.How does Aetrix verify that SMB8J40CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J40CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J40CA-M3/5B?
All SMB8J40CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMB8J40CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CA-M3/5B Tags
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