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Vishay General Semiconductor - Diodes Division SMBG18CA-M3/52
- Part No.:
- SMBG18CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18CA-M3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,934
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Product details
Overview
SMBG18CA-M3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of signal and power lines. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 29.2 V at 21.7 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBG18CA-M3/52 datasheet, SMBG18CA-M3/52 pinout, SMBG18CA-M3/52 application, or SMBG18CA-M3/52 equivalent, this device is selected for high-reliability transient suppression in automotive sensor interfaces, industrial I/O ports, and DC power rail protection where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are required.
Technical Context
The SMBG18CA-M3/52 operates as a bidirectional avalanche diode, symmetrically clamping voltage transients above ±20.0 V in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 18 V), while its low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads, it delivers 600 W peak pulse power with 0.01% duty cycle and supports operating junction temperatures from –55 °C to +150 °C. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 29.2 V at 21.7 A - Clamped voltage under 600 W 10/1000 µs surge; limits stress on downstream ICs like CAN transceivers or microcontrollers. |
| PPPM | 600 W - Peak pulse power handling per JEDEC standard; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at rated standoff; prevents signal distortion or battery drain in always-on circuits. |
| TJ max | +150 °C - Extended junction temperature rating enables use in under-hood automotive environments without derating. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including HTOL, TCT, and ESD testing per stress test plan. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Both terminals function identically; transient current flows either direction through the same avalanche junction - eliminates layout polarity constraints. |
| Case (cathode band absent) | Thermal and mechanical interface | No cathode band marking; terminals soldered to 5.0 mm × 5.0 mm copper pads for optimal thermal dissipation (RθJA = 100 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN bus) without external polarity management. |
| 600 W peak pulse power | Withstands repetitive 10/1000 µs surges up to 21.7 A - meets ISO 7637-2 Pulse 1/2/3a and IEC 61000-4-5 requirements for automotive electronics. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring extended lifetime and failure mode analysis. |
| Halogen-free (M3) | Complies with IPC-4101D/21 and EU Directive 2011/65/EU Annex II; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during transients - critical for protecting 3.3 V or 5 V logic interfaces adjacent to protected lines. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine compartments exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamps positive and negative spikes before they reach the ADC input or signal conditioning amplifier. Use Value: Prevents sensor signal corruption and microcontroller reset events by limiting transient voltage to ≤29.2 V during 100 V/50 ms load dump events. | Use Scenario: Safeguarding 24 V PLC digital input channels against field-wiring induced surges and ground loop transients. IC Role / Device Role / Timing Role: Standoff at 18 V allows normal 24 V operation while clamping >30 V transients to protect optocoupler input stages. Use Value: Enables reliable operation in factory environments with frequent motor switching, reducing field return rates due to input stage failures. |
| DC Power Rail Protection | CAN Bus Transient Suppression |
Use Scenario: Secondary overvoltage protection on 12 V vehicle infotainment power rails downstream of primary DC/DC converters. IC Role / Device Role / Timing Role: Fast-acting shunt device that diverts surge current away from PMICs and SoCs during battery connection/disconnection events. Use Value: Limits rail voltage excursion to 29.2 V during 100 V/10 ms pulses, preventing latch-up or permanent damage to 12 V-rated ICs. | Use Scenario: Protecting CANH/CANL lines in automotive ECUs against ESD and coupled transients from nearby high-current solenoids. IC Role / Device Role / Timing Role: Bidirectional clamping maintains signal integrity on differential bus lines without disrupting common-mode voltage range. Use Value: Ensures CAN communication remains functional after ±25 kV contact ESD (IEC 61000-4-2) and 42 V/100 ms ISO 7637-2 Pulse 2b events. |
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 | Same VWM (18 V), identical VBR and VC, but in SMB (DO-214AA) package with higher RθJA (125 °C/W) and no AEC-Q101 qualification. | Not approved for automotive under-hood use; suitable for industrial or consumer applications with less stringent reliability requirements. | Select SMBJ18CA only when AEC-Q101 is not mandated and PCB pad area allows larger SMB footprint. |
| SMAJ18CA | Lower PPPM (400 W), smaller SMA (DO-214AC) package, higher VC (32.4 V), and no AEC-Q101 qualification. | Limited to lower-energy transients; insufficient for ISO 7637-2 Pulse 5a (load dump) in automotive designs. | Choose SMAJ18CA for cost-sensitive, space-constrained consumer electronics where 400 W surge capability suffices. |
Compared with SMBJ18CA and SMAJ18CA, SMBG18CA-M3/52 provides superior thermal performance (RθJA = 100 °C/W), automotive-grade reliability via AEC-Q101, and higher surge robustness - making it the preferred choice for mission-critical 12 V system protection where long-term field stability is mandatory.
Availability
SMBG18CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and 12 V DC power rail protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBG18CA-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 high-reliability, automotive-qualified components.
The SMBG series was developed specifically for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding AEC-Q101 compliance, low clamping voltage, and repeatable surge performance.
FAQ
What is the standoff voltage (VWM) of SMBG18CA-M3/52?
The SMBG18CA-M3/52 has a maximum reverse standoff voltage (VWM) of 18 V. This means it remains non-conductive under normal operating conditions up to 18 V DC or peak AC, providing a safety margin before avalanche clamping initiates. The value is confirmed in Vishay's official datasheet (Document Number: 88456, Rev. 09-Jan-2024) and applies across the full operating temperature range.
Is SMBG18CA-M3/52 unidirectional or bidirectional?
SMBG18CA-M3/52 is a bidirectional transient voltage suppressor. Its CA suffix explicitly denotes bidirectional functionality, meaning it clamps voltage transients equally in both polarities - essential for protecting AC-coupled signals, differential buses (e.g., CAN, RS-485), or systems where polarity reversal may occur. No cathode band marking is present on the SMBG (DO-215AA) package.
Does SMBG18CA-M3/52 meet automotive qualification standards?
Yes, SMBG18CA-M3/52 is AEC-Q101 qualified, as stated in the Vishay datasheet (Document Number: 88456). This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and ESD (HBM/MM), validating its suitability for automotive applications such as engine control, body electronics, and ADAS sensor interfaces.
What is the clamping voltage (VC) of SMBG18CA-M3/52 at its rated surge current?
The SMBG18CA-M3/52 clamps to a maximum of 29.2 V at its peak pulse current (IPPM) of 21.7 A, measured using the standard 10/1000 µs waveform. This clamping voltage is critical for ensuring downstream ICs - such as microcontrollers or CAN transceivers - remain within their absolute maximum ratings during surge events. The value is specified in the Electrical Characteristics table of the Vishay datasheet.
What does the "M3" suffix indicate in SMBG18CA-M3/52?
Per Vishay's ordering information, the "M3" suffix in SMBG18CA-M3/52 indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD201 Class 2 whisker resistance requirements - confirming suitability for lead-free reflow processes and long-term reliability in industrial and automotive assemblies.
SMBG18CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG18CA-M3/52 FAQ
1.How can I place an order for SMBG18CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18CA-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 SMBG18CA-M3/52 reliable?
The price and inventory of SMBG18CA-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 SMBG18CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18CA-M3/52?
SMBG18CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18CA-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 SMBG18CA-M3/52?
For technical support, including SMBG18CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18CA-M3/52 requirements.
6.How does Aetrix verify that SMBG18CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18CA-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 SMBG18CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18CA-M3/52?
All SMBG18CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18CA-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 SMBG18CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBG18CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18CA-M3/52 Tags
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