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Vishay General Semiconductor - Diodes Division SMBJ12CA-M3/52
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- Part No.:
- SMBJ12CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CA-M3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,175
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Product details
Overview
SMBJ12CA-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 a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power dissipation - deployed to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CA-M3/52 datasheet, SMBJ12CA-M3/52 pinout, SMBJ12CA-M3/52 application, or SMBJ12CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.66), M3 halogen-free RoHS compliance, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This device operates as a voltage-clamped surge protector using an avalanche breakdown mechanism. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints, and its 10/1000 µs waveform response supports IEC 61000-4-5 Level 3/4 surge immunity requirements.
The SMBJ12CA-M3/52 exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min / max | 13.3 V / 14.7 V at 1.0 mA - Breakdown voltage tolerance band; ensures predictable turn-on across production lots. |
| VC @ IPPM | 19.9 V at 30.2 A (10/1000 µs) - Clamping voltage under standardized surge; determines worst-case overvoltage seen by downstream components. |
| PPPM | 600 W - Peak pulse power handling capacity; validates suitability for IEC 61000-4-5 line surge testing. |
| ID @ VWM | 5.0 µA - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in high-ambient environments like industrial motor drives. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.21 mm × 4.57 mm footprint; compatible with JEDEC MS-012AC and automated pick-and-place. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No functional distinction between terminals; either side may connect to line or ground in AC or differential configurations. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against IEC 61000-4-5 surges up to 4 kV (line-earth) in properly designed layouts. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic interfaces. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU environmental compliance mandates. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow without moisture sensitivity concerns or baking preconditioning. |
| 150 °C maximum junction temperature | Supports deployment in under-hood automotive modules or enclosed industrial enclosures without active cooling. |
Applications
| Industrial Motor Drives | Telecom Line Interface |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback during IGBT switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across DC bus or signal lines to limit transient excursions. Use Value: Prevents latch-up or oxide breakdown in 12 V logic-supplied gate drivers by limiting overvoltage to ≤19.9 V during 30 A surges. |
Use Scenario: Surge suppression on RS-485 or Ethernet PHY signal pairs exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Symmetrical TVS pair bridging differential lines to shunt common-mode transients. Use Value: Maintains signal integrity by clamping differential surges within ±19.9 V while adding <1 pF capacitance at 0 V bias. |
| Automotive Body Control Module | Consumer Sensor Hub |
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element on supply rail and data lines with AEC-Q101-qualified variants available. Use Value: Enables use of commercial-grade SMBJ12CA-M3/52 in non-safety-critical zones where halogen-free compliance is mandated. |
Use Scenario: ESD and EFT protection for I²C/SPI lines connecting MEMS accelerometers and MCU in smart home devices. IC Role / Device Role / Timing Role: Low-leakage (5 µA) transient suppressor placed adjacent to connector or sensor IC input pins. Use Value: Eliminates false triggers in low-power sleep modes while responding in <1 ns to 8 kV HBM ESD 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 |
|---|---|---|---|
| SMBJ12CA-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for cost-sensitive commercial designs where halogen-free certification is not required. | Select when regulatory compliance allows standard RoHS without halogen restrictions. |
| SMCJ12CA-M3 | Same VWM/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating. | Used where higher surge margin or improved thermal dissipation is needed on high-current power rails. | Choose when board space permits larger footprint and system-level surge testing exceeds 600 W requirements. |
Compared with SMBJ12CA-E3/52, the M3 variant adds halogen-free assurance without performance trade-offs; versus SMCJ12CA-M3, the SMBJ12CA-M3/52 offers 40 % smaller PCB area at the cost of 60 % lower peak power rating - ideal for space-constrained signal-line protection.
Availability
SMBJ12CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and consumer sensor hubs requiring stable component supply with halogen-free compliance and automated assembly support.
Supply support for SMBJ12CA-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, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series targets board-level transient protection in space-constrained, high-volume applications - engineered for fast response, repeatable clamping, and compatibility with modern SMT manufacturing flows.
FAQ
What is the clamping voltage of SMBJ12CA-M3/52 under a 10/1000 µs surge?
The SMBJ12CA-M3/52 clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 30.2 A with a 10/1000 µs waveform. This value is guaranteed across temperature and production lot variations per Vishay Document 88392, ensuring consistent overvoltage protection for downstream ICs in real-world surge events.
Is SMBJ12CA-M3/52 suitable for bidirectional signal line protection?
Yes, SMBJ12CA-M3/52 is explicitly designed for bidirectional applications, as indicated by the "CA" suffix. Its symmetrical breakdown behavior allows it to protect AC-coupled, differential, or floating signal paths - such as RS-485 or CAN FD lines - without requiring orientation-dependent placement on the PCB.
Does SMBJ12CA-M3/52 meet automotive qualification standards?
The base SMBJ12CA-M3/52 is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the HM3 variant (e.g., SMBJ12CAHM3_B/H) which carries full AEC-Q101 qualification. For non-safety-critical automotive body electronics where halogen-free compliance is mandatory, the M3 suffix meets material requirements even without automotive qualification.
What is the thermal resistance of SMBJ12CA-M3/52, and how does it affect layout?
SMBJ12CA-M3/52 has a typical RθJA of 100 °C/W and RθJL of 20 °C/W. To achieve rated 600 W pulse power, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases junction temperature and requires derating per Figure 2 in Document 88392.
How does the M3 suffix differ from E3 in SMBJ12CA-M3/52?
The M3 suffix denotes halogen-free, RoHS-compliant construction, whereas E3 indicates RoHS-compliant but standard brominated flame-retardant molding compound. Both share identical electrical parameters and package dimensions; the M3 variant satisfies stricter environmental mandates such as China RoHS II Annex III and JEDEC JS-709E material declarations.
SMBJ12CA-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 30.2A
- 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)
SMBJ12CA-M3/52 FAQ
1.How can I place an order for SMBJ12CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CA-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 SMBJ12CA-M3/52 reliable?
The price and inventory of SMBJ12CA-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 SMBJ12CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ12CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CA-M3/52?
SMBJ12CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CA-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 SMBJ12CA-M3/52?
For technical support, including SMBJ12CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ12CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ12CA-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 SMBJ12CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ12CA-M3/52?
All SMBJ12CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CA-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 SMBJ12CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ12CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CA-M3/52 Tags
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