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Vishay General Semiconductor - Diodes Division SMBJ12CA-M3/5B
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- Part No.:
- SMBJ12CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CA-M3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ12CA-M3/5B 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 power and signal lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and telecom interfaces.
For engineers reviewing the SMBJ12CA-M3/5B datasheet, SMBJ12CA-M3/5B pinout, SMBJ12CA-M3/5B application, or SMBJ12CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.66), MSL Level 1 moisture sensitivity, 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 TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive transient events.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) on standard pad layout and 20 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and is halogen-free per JESD201 Class 2 whisker test requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum steady-state reverse voltage before clamping begins; defines operating margin below breakdown. |
| VBR min/max | 13.3 V / 14.7 V at 1.0 mA - Confirmed breakdown voltage range ensures reliable triggering across process variation. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamping voltage during 10/1000 µs surge; limits downstream component stress to safe levels. |
| PPPM | 600 W - Peak transient power handling capacity; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 30.2 A - Peak surge current capability with 10/1000 µs waveform; validated with derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; enables use in high-temperature industrial environments without thermal shutdown. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm max length, compatible with IPC-7351B footprint. |
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 | Transient current entry (bidirectional) | Accepts surge current from either direction; forms symmetrical clamping path with cathode. |
| Cathode | Transient current exit (bidirectional) | Completes clamping loop; no band marking distinguishes it from unidirectional variants. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5. |
| Bidirectional clamping symmetry | Eliminates need for polarity-aware layout; supports AC line, RS-485, CAN, and Ethernet PHY protection. |
| MSL Level 1 rating (260 °C peak reflow) | Permits standard lead-free reflow without pre-baking; reduces manufacturing complexity and cost. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for global industrial and telecom equipment shipments. |
| UL 497B recognized (QVGQ2) | Validates safety certification for telecom and data line protector applications without additional agency testing. |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump and inductive switching transients on 12 V DC input rails of PLC modules and motor drives. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching DC-DC converters and microcontrollers. Use Value: Limits rail voltage excursion to ≤19.9 V during 30.2 A transients, preventing latch-up or overvoltage damage to downstream 16 V-rated components. |
Use Scenario: Protects analog output lines (e.g., 4–20 mA current loops) and LIN bus nodes in engine control units from ESD and battery reversal spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted adjacent to connector pins to absorb fast-rising ESD events (<1 ns rise time) and slow 12 V system faults. Use Value: Maintains signal integrity with <1.0 µA leakage at 12 V, while clamping 8 kV contact ESD to <20 V peak per IEC 61000-4-2. |
| Telecom Data Line Protection | Consumer USB Port Surge Suppression |
|
Use Scenario: Shields RS-485 transceivers and Ethernet PHYs in base station backhaul equipment from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across A/B lines to clamp common-mode transients without disrupting DC bias. Use Value: Achieves <19.9 V clamping at 30.2 A with matched VBR tolerance (±5.2%), ensuring balanced protection on twisted-pair interfaces. |
Use Scenario: Guards USB 2.0 D+/D− lines in smart home hubs against ESD and hot-plug voltage overshoot during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 250 pF at 0 V) integrated into USB connector footprint to minimize signal distortion. Use Value: Provides sub-20 V clamping within 1 ns response time while adding <0.5 dB insertion loss at 480 MHz - compliant with USB 2.0 eye diagram specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/5B | RoHS-compliant but not halogen-free; same electrical specs and SMB package. | Preferred for commercial-grade designs where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement; identical layout and performance. |
| SMAJ12CA-M3 | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients or space-constrained consumer PCBs. | Choose only if board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2; requires thermal redesign. |
Compared with SMBJ12CA-E3/5B, the SMBJ12CA-M3/5B offers halogen-free compliance without trade-offs in clamping or power rating; versus SMAJ12CA-M3, it delivers 50 % higher surge power handling and superior thermal dissipation in the same design flow.
Availability
SMBJ12CA-M3/5B is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, telecom data lines, and consumer USB port protection requiring stable component supply and full halogen-free compliance.
Supply support for SMBJ12CA-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 diodes, rectifiers, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in harsh environments, targeting industrial automation, automotive electronics, and infrastructure communications where robustness and certification readiness are mandatory.
FAQ
What is the clamping voltage of SMBJ12CA-M3/5B at its rated peak pulse current?
The SMBJ12CA-M3/5B has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 30.2 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12CA-M3/5B maintains this clamping performance across its qualified operating temperature range of −55 °C to +150 °C.
Is SMBJ12CA-M3/5B suitable for automotive applications?
The SMBJ12CA-M3/5B itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ12CA-HM3_B/I variant with AEC-Q101 qualification for automotive use. The SMBJ12CA-M3/5B shares the same electrical characteristics, SMB package, and halogen-free construction, making it suitable for non-safety-critical automotive subsystems like infotainment or body electronics where formal qualification is not mandated. Always verify system-level compliance requirements before selecting SMBJ12CA-M3/5B for automotive deployment.
How does the bidirectional nature of SMBJ12CA-M3/5B affect its PCB layout?
The SMBJ12CA-M3/5B has no polarity marking and functions identically in both directions, eliminating orientation constraints during automated placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment-simplifying layout, reducing assembly errors, and enabling direct replacement in AC-coupled or differential signal paths such as RS-485, CAN, or Ethernet. Its symmetric VBR (13.3 V to 14.7 V) ensures matched clamping in either direction, and the SMB (DO-214AA) footprint remains unchanged regardless of orientation. This makes SMBJ12CA-M3/5B ideal for high-volume SMT lines where placement flexibility improves throughput.
What is the maximum reverse leakage current of SMBJ12CA-M3/5B at its stand-off voltage?
The SMBJ12CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 12 V stand-off voltage (VWM) and 25 °C ambient temperature, as specified in Table 1 of Vishay document 88392. This low leakage ensures minimal power loss in always-on circuits and prevents unintended loading of high-impedance sensor outputs or reference rails. Leakage remains below 5.0 µA up to +85 °C, supporting stable operation in industrial environments without compromising signal fidelity or battery life in portable systems.
Does SMBJ12CA-M3/5B meet any safety certifications?
Yes, the SMBJ12CA-M3/5B carries Underwriters Laboratories (UL) recognition under file number E136766 and standard UL 497B for protectors, covering both unidirectional and bidirectional configurations. This certification validates its suitability for use in telecom and data line protection applications where agency approval is required. Additionally, it complies with RoHS Directive 2011/65/EU and is halogen-free per JESD201 Class 2, satisfying environmental mandates for global market access. The SMBJ12CA-M3/5B is not certified to IEC 61000-4-5 as a standalone system, but its 600 W rating aligns with Level 4 surge immunity testing requirements when properly implemented.
SMBJ12CA-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):
- 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-M3/5B FAQ
1.How can I place an order for SMBJ12CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CA-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 SMBJ12CA-M3/5B reliable?
The price and inventory of SMBJ12CA-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 SMBJ12CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ12CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CA-M3/5B?
SMBJ12CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CA-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 SMBJ12CA-M3/5B?
For technical support, including SMBJ12CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ12CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ12CA-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 SMBJ12CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ12CA-M3/5B?
All SMBJ12CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CA-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 SMBJ12CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ12CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CA-M3/5B Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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