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SMBJ12CA is a transient voltage suppressor diode that is used to protect sensitive electronic equipment from voltage transients induced by lightning and other transient voltage events. For SMBJ12CA diode, the breakdown voltage is 13.3 V and clamping voltage is 19.9 V.


Pin Configuration

Pin No.

Pin Name




Current always Enters through Anode



Current always Exits through Cathode



  • Current - Peak Pulse : 30.2A
  • Working Voltage: 12 V
  • Breakdown Voltage: 13.3 V to 14.7 V
  • Clamping Voltage: 19.9 V
  • Operating Temperature Range: -65 to 150 °C
  • Available in DO-214AA-2 (SMB) Package


Note: Complete Technical Details can be found at the SMBJ12CA datasheet given at the end of this page.


Alternative for SMBJ12CA: P6KE200A

Other TVS Diodes: P6KE180A, SM712, SRV05


Brief Note on SMBJ12CA

SMBJ12CA is a TVS diode that can nullify the sudden or momentary overvoltage effects on sensitive semiconductors and circuits. SMBJ12CA is connected in parallel with the device or circuit to be protected. Marking diagram for SMJB series is given below.

SMBJ12CA StructureSMBJ12CA Naming


Anode and cathode can be differentiated by the colour band on cathode side. In SMJB12CA, SMJB is the series name, 12 is the operating voltage of diode, C stands for bi-directional and A is the voltage tolerance (5%). Graph between peak forward voltage and peak forward current is shown below. I-V characteristics for SMJB12CA is shown below. A bi-directional diode has the same characteristic curve in the positive and the negative direction, so it does not matter which way they are connected into the circuit. A unidirectional diode has a higher turn-on voltage in the positive direction compared to the negative direction.

Characteristics Diagram of SMBJ12CA


Applications of Diode

  • Diversion/clamping in low-energy circuits
  • Data and Signal lines
  • Microprocessor and MOS memory
  • AC/DC power lines
  • Telecommunication Equipments


2D representation (DO-214AA-2)

2D representation for SMBJ12CA

Component Datasheet

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