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Vishay General Semiconductor - Diodes Division SMBJ12CD-M3/I
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- Part No.:
- SMBJ12CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CD-M3/I.pdf
- Description:
- TVS DIODE 12VWM 19.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,600
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Product details
Overview
SMBJ12CD-M3/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 12 V standoff voltage (VWM), 13.5–14.5 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamping voltage of 19.6 V at 30.6 A. It protects signal lines and power rails in industrial sensor interfaces and telecom front-ends against ESD and inductive switching transients.
For engineers reviewing the SMBJ12CD-M3/I datasheet, SMBJ12CD-M3/I pinout, SMBJ12CD-M3/I application, or SMBJ12CD-M3/I equivalent, this page delivers verified electrical parameters, bidirectional polarity confirmation, thermal resistance (RθJA = 125 °C/W), MSL Level 1 moisture sensitivity, and RoHS-compliant halogen-free construction per JESD 201 Class 2 whisker test.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior for positive and negative transients - confirmed by "Electrical characteristics apply in both directions" and VBR/VC values listed for bidirectional types in the SMBJxxCD series. Its 10/1000 μs waveform rating supports IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) when properly laid out.
The device uses silicon avalanche junction technology with low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2, ±15 kV air), EFT (IEC 61000-4-4), and lightning-induced surges. Thermal performance is defined for mounting on minimum recommended pad layout (RθJA = 125 °C/W) and 5.0 mm × 5.0 mm copper area (RθJA = 100 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working range for protected circuit. |
| VBR (min/max) | 13.5 V / 14.5 V at 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 19.6 V at 30.6 A - Clamped voltage during 600 W transient; limits stress on downstream ICs like RS-485 transceivers or ADC inputs. |
| IPPM | 30.6 A - Peak surge current capability under 10/1000 μs waveform; determines survivability against 1 A·s surge energy. |
| PPPM | 600 W - Peak pulse power rating; validates compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) with margin. |
| RθJA | 125 °C/W - Junction-to-ambient thermal resistance on standard PCB pad; used to calculate max ambient temperature for 150 °C TJ limit. |
| TJ max | 150 °C - Maximum junction temperature; sets upper bound for thermal design in sealed enclosures or high-power density layouts. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no cathode band. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102; meets MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (End without marking) | Transient current entry point (negative polarity) | Conducts during negative voltage excursions; symmetrical with cathode for bidirectional clamping. |
| Cathode (End without marking) | Transient current entry point (positive polarity) | Conducts during positive voltage excursions; identical electrical behavior to anode due to bidirectional structure. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise overvoltage protection window alignment without derating, critical for 12 V rail systems with tight supply margins. |
| 600 W peak pulse power (10/1000 μs) | Supports robust IEC 61000-4-5 surge immunity up to 4 kV in properly designed PCB layouts with adequate copper area. |
| Low leakage current (≤2.0 μA at VWM) | Minimizes standby power loss and avoids false triggering in high-impedance sensor bias networks or battery-powered nodes. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak, eliminating bake requirements for high-volume SMT assembly. |
| Halogen-free, RoHS-compliant, JESD 201 Class 2 | Meets automotive and industrial environmental compliance mandates while ensuring long-term interconnect reliability under thermal cycling. |
Applications
| Industrial Sensor Interface | RS-485 Communication Line |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to motor drive noise and relay coil kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and controller input, shunting transients before they reach precision op-amps or ADCs. Use Value: Limits induced spikes to ≤19.6 V, preserving 12-bit ADC accuracy and preventing latch-up in microcontroller GPIOs tied to sensor outputs. | Use Scenario: Safeguarding differential data lines in industrial RS-485 networks subject to ground potential differences and lightning-induced surges. IC Role / Device Role / Timing Role: Paired TVS configuration (one per line) referenced to common-mode ground, clamping common-mode and differential transients simultaneously. Use Value: Maintains signal integrity under 1 kV EFT bursts and 2 kV surge events per IEC 61000-4-4/5, ensuring >99.9% uptime in SCADA backhaul links. |
| Telecom Power Input | Automotive Body Control Module |
Use Scenario: Front-end protection of 12 V DC input to VoIP gateways and small-cell base station power supplies subjected to load dump and hot-swap transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters, absorbing energy before it reaches input capacitors and controller ICs. Use Value: Withstands 600 W pulses without degradation, extending power stage MTBF by reducing voltage stress on MOSFETs and PWM controllers. | Use Scenario: CAN bus and LIN bus line protection in body control modules where infotainment and lighting loads generate repetitive inductive spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair and LIN bus to ground, suppressing ESD and load dump coupling. Use Value: Clamps transients to <20 V within <1 ns, preventing communication errors and bus lockup during door actuator or headlight switching 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 (Vishay) | Same VWM/VBR/PPPM, but M3 suffix omitted; not halogen-free or JESD 201 Class 2 qualified. | Lacks industrial-grade whisker resistance and RoHS/halogen-free compliance required for medical or automotive Tier-1 BOMs. | Select SMBJ12CD-M3/I when traceable sourcing, extended reliability testing, and regulatory documentation are mandatory. |
| 1.5SMC12CA (ON Semiconductor) | Same SMB package and bidirectional 12 V rating, but ±5 % VBR tolerance (vs. ±3.5 %) and higher leakage (5 μA vs. ≤2 μA). | Lower clamping ratio and wider VBR spread reduce margin in precision 12 V systems with narrow fault thresholds. | Choose SMBJ12CD-M3/I for designs requiring tighter VBR control and lower leakage in battery-sensitive or high-accuracy sensor nodes. |
Compared with SMBJ12CA-E3/52 and 1.5SMC12CA, SMBJ12CD-M3/I provides superior process control (tighter VBR), enhanced reliability (Class 2 whisker test), and full environmental compliance - making it preferred for industrial and automotive applications where long-term field stability and audit readiness are critical.
Availability
SMBJ12CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 communication lines, telecom power inputs, and automotive body control modules requiring stable component supply and guaranteed long-term manufacturability.
Supply support for SMBJ12CD-M3/I 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 application-specific optimization.
The SMBJxxCD series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where repeatable clamping performance and long-term stability under thermal cycling are essential.
FAQ
What is the polarity configuration of SMBJ12CD-M3/I?
SMBJ12CD-M3/I is a bidirectional transient voltage suppressor, meaning it provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMBJ12D), it has no cathode band marking and conducts identically in either direction - confirmed by its CD suffix and specification table entries for bidirectional VBR and VC values in the Vishay datasheet (Doc. #87606).
What does the "M3/I" suffix indicate for SMBJ12CD-M3/I?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance, while "I" specifies packaging in 13-inch tape-and-reel format with 3200 units per reel. This distinguishes SMBJ12CD-M3/I from non-M3 variants (e.g., SMBJ12CD-E3) and smaller reels (e.g., "H" = 7-inch, 750 units), ensuring compliance and logistics compatibility for high-volume SMT lines.
What is the maximum clamping voltage of SMBJ12CD-M3/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ12CD-M3/I is 19.6 V at 30.6 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a 600 W transient event - critical for ensuring downstream components like 16 V-rated LDOs or 20 V-max microcontrollers remain within safe operating area.
How does SMBJ12CD-M3/I perform thermally on a standard PCB layout?
SMBJ12CD-M3/I exhibits a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet. At 1.0 W steady-state power dissipation (TA = 25 °C), this results in ~125 °C junction rise - well within its 150 °C TJ max rating. For sustained operation, designers must verify ambient temperature and copper area to avoid exceeding TJ limits during repeated surge events.
Is SMBJ12CD-M3/I suitable for IEC 61000-4-2 ESD protection?
Yes, SMBJ12CD-M3/I is suitable for IEC 61000-4-2 ESD protection, with sub-nanosecond response time and low clamping voltage (19.6 V) enabling effective suppression of ±15 kV contact and ±25 kV air discharge events. Its bidirectional architecture ensures protection regardless of ESD polarity, and its low leakage (<2 μA at 12 V) prevents interference with high-impedance signal paths - making SMBJ12CD-M3/I appropriate for USB, sensor, and serial interface protection where system-level ESD robustness is required.
SMBJ12CD-M3/I 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):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 19.6V
- Current - Peak Pulse (10/1000µs):
- 30.6A
- 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)
SMBJ12CD-M3/I FAQ
1.How can I place an order for SMBJ12CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CD-M3/I 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 SMBJ12CD-M3/I reliable?
The price and inventory of SMBJ12CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ12CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CD-M3/I?
SMBJ12CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CD-M3/I 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 SMBJ12CD-M3/I?
For technical support, including SMBJ12CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CD-M3/I requirements.
6.How does Aetrix verify that SMBJ12CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12CD-M3/I 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 SMBJ12CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ12CD-M3/I?
All SMBJ12CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CD-M3/I, 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 SMBJ12CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ12CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CD-M3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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