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Vishay General Semiconductor - Diodes Division SMBJ18CA-M3/52
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- Part No.:
- SMBJ18CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CA-M3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,373
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Product details
Overview
SMBJ18CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ18CA-M3/52 datasheet, SMBJ18CA-M3/52 pinout, SMBJ18CA-M3/52 application, or SMBJ18CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.62), halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation under repetitive transient stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 600 W transient, limiting downstream stress |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform, 0.01% duty cycle |
| IPPM | 20.5 A - peak pulse current corresponding to VC, derived from PPPM/VC |
| TJ max. | 150 °C - maximum junction temperature supporting industrial ambient operation |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm length and 4.06 mm width |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | One of two symmetrical terminals; no fixed anode/cathode designation in bidirectional mode |
| Anode/Cathode | Clamping node pair | Interchangeable terminals forming a symmetric voltage clamp across protected line and return |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Handles high-energy transients such as IEC 61000-4-5 surge events up to 4 kV (line-earth) |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for commercial-grade industrial electronics |
| MSL Level 1 rating | Supports standard reflow profiles up to 260 °C peak without preconditioning or dry-pack requirements |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream ICs like RS-485 transceivers or microcontroller I/O |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to motor switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to suppress ±1 kV EFT bursts. Use Value: Limits transient voltage to ≤29.2 V, preventing latch-up or damage to 3.3 V or 5 V ADC input stages. |
Use Scenario: Safeguarding RS-485 transceiver data lines in building management systems connected to long outdoor runs. IC Role / Device Role / Timing Role: Primary surge suppression element on differential bus lines, coordinated with common-mode chokes. Use Value: Clamps induced lightning surges to <30 V within nanoseconds, preserving signal integrity and transceiver reliability. |
| Automotive Body Control Module | Consumer Appliance Power Input |
|
Use Scenario: Suppressing load-dump transients on LIN bus lines in door module ECUs subjected to battery disconnection events. IC Role / Device Role / Timing Role: Secondary protection stage after primary TVS or varistor, placed near LIN transceiver pins. Use Value: Withstands 600 W pulses and maintains VC below 30 V, ensuring safe operation of AEC-Q100 qualified transceivers. |
Use Scenario: Protecting AC-DC converter input rectifier stage against mains-borne surges in smart home hubs. IC Role / Device Role / Timing Role: Parallel-connected TVS across bridge rectifier output to clamp DC-link overvoltage spikes. Use Value: Fast response (<1 ns) and low VC prevent overvoltage stress on bulk capacitor and controller IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Preferred for non-halogen-restricted commercial designs where cost optimization is prioritized | Select SMBJ18CA-E3/52 if halogen-free certification is not required and lower unit cost is critical. |
| SMAJ18CA-M3 | Lower 400 W PPPM, larger VC (32.4 V), SMA package (smaller thermal mass) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3+ or high-current inductive switching | Choose SMAJ18CA-M3 only for space-constrained, low-power signal lines where 600 W headroom is unnecessary. |
Compared with SMBJ18CA-M3/52, the E3 variant offers identical protection performance with standard RoHS compliance, while the SMAJ18CA-M3 trades peak power and clamping voltage for smaller footprint - making SMBJ18CA-M3/52 optimal for robust industrial and telecom surge immunity where PCB area permits SMB packaging.
Availability
SMBJ18CA-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance power inputs requiring stable component supply and halogen-free compliance.
Supply support for SMBJ18CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series targets high-energy transient suppression in harsh environments, engineered for industrial, automotive, and telecom systems where consistent clamping behavior and AEC-Q101 qualification options are essential.
FAQ
What does the "CA" suffix indicate in SMBJ18CA-M3/52?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ18CA-M3/52 provides symmetrical clamping for both positive and negative transients without polarity sensitivity. This differs from unidirectional variants (e.g., SMBJ18A), which require correct cathode orientation and only clamp in reverse bias. The CA version is ideal for AC-coupled or floating signal paths.
Is SMBJ18CA-M3/52 suitable for IEC 61000-4-5 surge testing?
Yes, SMBJ18CA-M3/52 is rated for 600 W peak pulse power with a 10/1000 µs waveform, aligning with Level 3 (2 kV line-earth, 1 kV line-line) and Level 4 (4 kV line-earth) IEC 61000-4-5 test conditions when properly mounted on 0.2" × 0.2" copper pads. Its 29.2 V clamping voltage ensures downstream ICs remain within safe operating limits during surge events.
How does the M3 suffix affect compliance and reliability of SMBJ18CA-M3/52?
The M3 suffix indicates SMBJ18CA-M3/52 is halogen-free and RoHS-compliant, meeting stringent environmental standards for commercial-grade applications. It also satisfies JESD 201 Class 2 whisker resistance and MSL Level 1 reflow requirements (260 °C peak), ensuring long-term solder joint integrity and process compatibility in high-volume SMT assembly.
What is the thermal resistance of SMBJ18CA-M3/52, and how does it impact layout design?
SMBJ18CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain TJ ≤150 °C under repetitive surges, PCB layout must use the minimum recommended 0.2" × 0.2" copper pads per terminal - reducing thermal impedance and preventing localized overheating during high-duty-cycle transient events.
Can SMBJ18CA-M3/52 replace SMBJ18A-M3/52 in an existing design?
No - SMBJ18CA-M3/52 is bidirectional while SMBJ18A-M3/52 is unidirectional, so direct substitution requires circuit review. The unidirectional part has a cathode band and conducts forward current; replacing it with SMBJ18CA-M3/52 removes polarity dependence but may alter leakage or clamping symmetry. Layout changes are not needed, but system-level validation of transient response and DC bias behavior is mandatory before replacement.
SMBJ18CA-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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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)
SMBJ18CA-M3/52 FAQ
1.How can I place an order for SMBJ18CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CA-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 SMBJ18CA-M3/52 reliable?
The price and inventory of SMBJ18CA-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 SMBJ18CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CA-M3/52?
SMBJ18CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CA-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 SMBJ18CA-M3/52?
For technical support, including SMBJ18CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ18CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18CA-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 SMBJ18CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18CA-M3/52?
All SMBJ18CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CA-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 SMBJ18CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ18CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CA-M3/52 Tags
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