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Vishay General Semiconductor - Diodes Division SMBJ40CA-M3/52
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- Part No.:
- SMBJ40CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-M3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,286
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Product details
Overview
SMBJ40CA-M3/52 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 stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power dissipation with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ40CA-M3/52 datasheet, SMBJ40CA-M3/52 pinout, SMBJ40CA-M3/52 application, or SMBJ40CA-M3/52 equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal derating curves, M3 halogen-free RoHS compliance status, and direct alternative part comparisons for ESD/surge protection design-in.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 44.4–49.1 V (min/max) under 1 mA test current, and exhibits low incremental surge resistance to maintain tight clamping during transient events. Its junction-to-ambient thermal resistance (RθJA) is 100 °C/W on standard 0.2" × 0.2" copper pads, supporting reliable operation up to 150 °C junction temperature.
The device meets J-STD-020 MSL Level 1 moisture sensitivity, has matte tin-plated leads solderable per J-STD-002, and is halogen-free and RoHS-compliant per base suffix M3. No polarity marking is present on the SMBJ40CA-M3/52 case, consistent with bidirectional construction.
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 - Breakdown occurs within this band at 1 mA; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 64.5 V - Clamped voltage seen by protected circuit during 9.3 A 10/1000 µs surge; limits stress on downstream ICs. |
| PPPM | 600 W - Peak transient power handling capability; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| IPPM | 9.3 A - Peak surge current supported at rated clamping voltage; derived from 10/1000 µs waveform with 0.01% duty cycle. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient environments like industrial enclosures or power supplies. |
| Package | SMB (DO-214AA) - Low-profile SMT footprint (5.21 mm × 4.06 mm × 2.30 mm); compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both ends function identically under reverse or forward transients.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (End A) | Transient current entry (either polarity) | Accepts surge current during positive or negative voltage excursions; connects to line being protected. |
| Cathode (End B) | Transient current entry (either polarity) | Identical functional role to Anode; bidirectional symmetry means either end may connect to line or ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| Bidirectional clamping | Protects AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN bus, Ethernet PHY interfaces. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for global OEM production, including EU RoHS Directive 2011/65/EU Annex II. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs or ICs. |
Applications
| Industrial Motor Drives | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensing circuits against inductive kickback from IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus or isolated signal lines to clamp fast-rising transients (<1 ns rise time) before they reach control ICs. Use Value: Limits voltage excursion to ≤64.5 V during 9.3 A surges, preventing destruction of 75 V-rated gate drivers and maintaining system uptime. |
Use Scenario: Surge suppression on T1/E1 line interface cards exposed to lightning-induced surges in central office or remote terminal units. IC Role / Device Role / Timing Role: Primary protection element on tip/ring pairs upstream of transformer-coupled transceivers, absorbing common-mode energy per GR-1089-CORE. Use Value: Withstands repeated 600 W surges while maintaining <1 µA leakage at 40 V, preserving signal integrity on 2.048 Mbps data links. |
| Automotive Body Control Modules | Consumer Power Adapters |
|
Use Scenario: Input rail protection in BCM sub-modules (e.g., window lift, seat control) subjected to load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Secondary clamping device after primary GDT or polymer PTC, placed directly at microcontroller power pins. Use Value: Fast response (<1 ps) and low VC ensure MCU supply remains within 5.5 V tolerance even during 100 V/50 ms load dump events. |
Use Scenario: Secondary-side overvoltage protection in USB PD and QC-compatible wall adapters where secondary rectifier output feeds controller ICs. IC Role / Device Role / Timing Role: Clamp transient spikes generated by transformer leakage inductance during MOSFET turn-off in flyback converters. Use Value: 64.5 V clamping prevents damage to 65 V-rated synchronous rectifier controllers while adding <0.5 mm² PCB area. |
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 electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); JEDEC MSL Level 1, same 260 °C reflow rating. | Approved for commercial-grade industrial systems where halogen-free requirement is not mandated (e.g., non-EU export units). | Select when cost sensitivity outweighs halogen-free compliance; identical layout and thermal performance. |
| SMAJ40CA-M3 | Lower 400 W PPPM, higher VC = 69.4 V at 6.4 A IPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients (IEC 61000-4-5 Level 2) and space-constrained designs where 0.5 W derated power is acceptable. | Choose for compact consumer electronics where 600 W headroom is unnecessary and PCB area is premium. |
Compared with SMBJ40CA-E3/52, the SMBJ40CA-M3/52 offers halogen-free compliance without trade-offs in clamping or surge rating; versus SMAJ40CA-M3, it delivers +50% peak power handling and tighter clamping in a thermally superior package - critical for automotive and industrial surge immunity.
Availability
SMBJ40CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interface cards, automotive body control modules, and consumer power adapters requiring stable component supply and halogen-free compliance.
Supply support for SMBJ40CA-M3/52 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, power efficiency, and AEC-Q101 qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where robustness and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ40CA-M3/52 at its rated peak pulse current?
The SMBJ40CA-M3/52 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated 9.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry sees no more than 64.5 V during such transients - a key parameter for ensuring compatibility with 75 V-rated downstream components. The SMBJ40CA-M3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ40CA-M3/52 suitable for bidirectional signal line protection?
Yes, SMBJ40CA-M3/52 is explicitly designed for bidirectional protection, as indicated by the "CA" suffix and confirmed in Vishay's datasheet: electrical characteristics apply identically in both directions, with symmetrical VBR (44.4–49.1 V) and VC (64.5 V) ratings. It requires no polarity orientation during placement - making it ideal for AC-coupled interfaces like RS-485, CAN FD, or Ethernet PHY lanes. The SMBJ40CA-M3/52 achieves this via a back-to-back diode structure housed in the SMB package.
Does SMBJ40CA-M3/52 meet automotive qualification standards?
No, SMBJ40CA-M3/52 is a commercial-grade part with halogen-free RoHS compliance (M3 suffix) but is not AEC-Q101 qualified. For automotive applications, Vishay offers the HM3 variant (e.g., SMBJ40CAHM3_B/H), which adds AEC-Q101 qualification while retaining identical electrical specs and SMB packaging. The SMBJ40CA-M3/52 remains appropriate for industrial and telecom systems where AEC-Q101 is not required, but its 150 °C TJ max and MSL Level 1 rating support demanding non-automotive environments.
What is the thermal resistance of SMBJ40CA-M3/52, and how does it affect layout?
The SMBJ40CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as defined in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad size increases RθJA and risks thermal runaway during repetitive surges. To sustain full 600 W pulse capability, designers must allocate adequate copper area and avoid excessive trace length between SMBJ40CA-M3/52 and ground/power planes.
How does the M3 suffix differ from E3 in SMBJ40CA-M3/52?
The M3 suffix in SMBJ40CA-M3/52 denotes halogen-free, RoHS-compliant construction using bromine-free flame retardants in the molding compound, whereas E3 uses RoHS-compliant materials that may contain halogens. Both meet RoHS Directive 2011/65/EU, but M3 satisfies stricter environmental mandates (e.g., JEITA EG-02, Apple Regulated Substances Specification). Electrically and mechanically, SMBJ40CA-M3/52 and SMBJ40CA-E3/52 are identical - same VWM, VC, PPPM, package, and MSL rating - allowing drop-in replacement where halogen-free content is required.
SMBJ40CA-M3/52 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):
- 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-M3/52 FAQ
1.How can I place an order for SMBJ40CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-M3/52 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 SMBJ40CA-M3/52 reliable?
The price and inventory of SMBJ40CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-M3/52?
SMBJ40CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-M3/52 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 SMBJ40CA-M3/52?
For technical support, including SMBJ40CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ40CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-M3/52 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 SMBJ40CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-M3/52?
All SMBJ40CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-M3/52, 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 SMBJ40CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ40CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-M3/52 Tags
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