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Vishay General Semiconductor - Diodes Division SMBJ40CA-M3/5B
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- Part No.:
- SMBJ40CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-M3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
SMBJ40CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 64.5 V at 9.3 A, and operates across –55 °C to +150 °C junction temperature range - deployed in industrial sensor signal lines, telecom interface protection, and MOSFET gate drive circuits.
For engineers reviewing the SMBJ40CA-M3/5B datasheet, SMBJ40CA-M3/5B pinout, SMBJ40CA-M3/5B application, or SMBJ40CA-M3/5B equivalent, key selection criteria include bidirectional clamping behavior, 64.5 V max clamping at rated surge current, halogen-free RoHS-compliant M3 termination, SMB package thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This bidirectional TVS diode functions as a voltage-clamped shunt protector: during transients exceeding VWM = 40 V, it avalanches symmetrically in both directions to limit voltage across protected circuit nodes. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 10/1000 µs waveform rating reflects standardized lightning/surge immunity testing per ANSI/IEEE C62.35.
The device delivers 600 W peak pulse power with 0.01% duty cycle, supports repetitive surge events when thermally managed, and exhibits a temperature coefficient of VBR of +0.101 %/°C - enabling predictable derating above 25 °C ambient using Fig. 2 in the datasheet. Its unmarked SMB package indicates bidirectional polarity, distinguishing it from cathode-banded unidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - guaranteed avalanche initiation range; ensures reliable triggering without premature conduction |
| VC (Clamping Voltage) | 64.5 V at IPPM = 9.3 A - peak voltage seen by protected circuit during full-rated 10/1000 µs surge |
| PPPM (Peak Pulse Power) | 600 W - surge energy handling capacity under standardized 10/1000 µs waveform; determines protection level against lightning-induced transients |
| IPPM (Peak Pulse Current) | 9.3 A - maximum non-repetitive surge current the device safely clamps without failure |
| TJmax | +150 °C - maximum junction temperature; enables operation in high-ambient industrial environments with appropriate PCB copper area |
| Package | SMB (DO-214AA) - surface-mount outline with 5.21 mm × 4.06 mm footprint, compatible with JEDEC-standard reflow profiles and J-STD-020 MSL Level 1 |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, no polarity marking (bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either terminal serves as anode or cathode depending on transient polarity; connected across protected line and ground or differential pair |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) when properly mounted on 5.0 mm × 5.0 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream ICs - e.g., keeps 3.3 V or 5 V logic interfaces within safe absolute maximum ratings during clamping |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and telecom equipment without compromising surge performance or solderability |
| Fast response time (<1 ps) | Activates before transient edges damage fast-switching components such as MOSFET gates or high-speed data receivers |
| MSL Level 1, peak reflow ≤260 °C | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements |
Applications
| Industrial Sensor Signal Protection | Telecom Interface ESD/Surge Guard |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors exposed to field wiring transients in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and system ground, absorbing inductive switch-off spikes and nearby lightning coupling. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to precision ADC front-ends or isolation amplifiers while maintaining signal integrity below 40 V normal operation. |
Use Scenario: Safeguarding RS-485/RS-232 transceiver pins in base station backhaul modules subjected to induced surges from outdoor cabling. IC Role / Device Role / Timing Role: Line-to-ground TVS on each differential pair (A/B) and control lines, providing symmetrical clamping without polarity constraints. Use Value: Withstands repeated 600 W surges per IEC 61000-4-5, preserving communication uptime and eliminating need for external reset or recalibration after transient events. |
| MOSFET Gate Drive Protection | Consumer Power Supply Input Stage |
|
Use Scenario: Shielding high-side/low-side MOSFET gate drivers in motor control inverters from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Clamp placed between gate and source terminals to suppress dv/dt-induced false turn-on and gate oxide overstress. Use Value: Fast sub-nanosecond response prevents gate voltage overshoot beyond ±20 V, ensuring reliable FET operation and extending lifetime in 48 V BLDC systems. |
Use Scenario: Secondary-side overvoltage suppression on DC input rails of smart home hubs and set-top boxes powered via wall adapters. IC Role / Device Role / Timing Role: Bidirectional TVS across +VIN and GND to absorb plug-in surges, hot-swap transients, and adapter regulation faults. Use Value: Halogen-free M3 construction meets regional safety standards while clamping 40 V nominal rails to 64.5 V - protecting USB-PD controllers and PMICs from latch-up. |
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 | RoHS-compliant but not halogen-free; same electrical specs and SMB package | Preferred for commercial-grade cost-sensitive designs where halogen-free certification is not mandated | Select when environmental compliance only requires RoHS, not IEC 61249-2-21 or JEDEC JS709E halogen limits |
| SMCJ40CA-M3 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with higher PPPM = 1500 W | Suitable for higher-energy surge environments (e.g., outdoor AC mains interfaces) requiring greater thermal mass | Choose when board space allows and surge threat level exceeds 600 W - e.g., DIN rail-mounted industrial PLC I/O modules |
Compared with SMBJ40CA-E3/5B, the SMBJ40CA-M3/5B adds halogen-free compliance without sacrificing surge rating or footprint; versus SMCJ40CA-M3, it trades 2.5× peak power for 30% smaller PCB area and lower thermal inertia - making it optimal for compact, high-density signal-line protection where 600 W suffices.
Availability
SMBJ40CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and MOSFET gate drive circuits requiring stable component supply, halogen-free compliance, and repeatable SMT assembly yield.
Supply support for SMBJ40CA-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
The SMBJ series is engineered for surface-mount transient suppression in space-constrained, high-volume applications - balancing surge robustness, thermal performance, and automated manufacturing compatibility across consumer, telecom, and factory automation segments.
FAQ
What is the clamping voltage of SMBJ40CA-M3/5B at its rated peak pulse current?
The SMBJ40CA-M3/5B has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 9.3 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ40CA-M3/5B maintains this clamping performance consistently across its operating temperature range.
Is SMBJ40CA-M3/5B suitable for bidirectional signal line protection?
Yes, SMBJ40CA-M3/5B is explicitly designed for bidirectional protection: the "CA" suffix denotes bidirectional functionality, and its symmetrical VBR (44.4–49.1 V) and VC characteristics apply equally in both polarities. It requires no polarity orientation during placement - ideal for protecting differential buses like RS-485, CAN, or USB D+/D− lines where transient polarity is unpredictable. The SMBJ40CA-M3/5B achieves this without internal series components, delivering true bilateral clamping performance.
How does the M3 suffix affect the compliance and assembly of SMBJ40CA-M3/5B?
The M3 suffix on SMBJ40CA-M3/5B indicates halogen-free, RoHS-compliant construction per JEDEC JS709E and IEC 61249-2-21, with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. It also passes JESD 201 Class 2 whisker testing. Unlike E3 variants, M3 ensures full environmental compliance for export to EU, China, and South Korea without impacting thermal or electrical specs - and supports standard lead-free reflow profiles up to 260 °C peak, matching SMBJ40CA-M3/5B's MSL Level 1 rating.
What PCB layout guidance applies to SMBJ40CA-M3/5B for optimal surge performance?
For rated 600 W surge capability, Vishay specifies mounting SMBJ40CA-M3/5B on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - which lowers thermal resistance and sustains peak power dissipation. Traces to protected nodes must be short and direct; ground connections should route to solid internal planes. Avoid thermal reliefs on pads, and ensure ≥0.5 mm clearance to adjacent conductors. These practices prevent localized heating and ensure SMBJ40CA-M3/5B clamps within spec during repetitive surges - validated per Figure 2 derating curves.
Can SMBJ40CA-M3/5B replace unidirectional TVS diodes in existing designs?
No - SMBJ40CA-M3/5B is strictly bidirectional and lacks polarity marking; substituting it for a unidirectional part (e.g., SMBJ40A-M3/5B) would compromise protection on DC-biased lines like power rails or single-ended digital signals, where reverse conduction must be blocked. Unidirectional variants use a cathode band and conduct only in reverse bias, while SMBJ40CA-M3/5B conducts symmetrically. Always verify circuit topology: SMBJ40CA-M3/5B is correct only where bidirectional clamping is required, such as AC-coupled or floating signal paths.
SMBJ40CA-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):
- 9.3A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ40CA-M3/5B FAQ
1.How can I place an order for SMBJ40CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-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 SMBJ40CA-M3/5B reliable?
The price and inventory of SMBJ40CA-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 SMBJ40CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-M3/5B?
SMBJ40CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-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 SMBJ40CA-M3/5B?
For technical support, including SMBJ40CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ40CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-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 SMBJ40CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-M3/5B?
All SMBJ40CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-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 SMBJ40CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ40CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-M3/5B Tags
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