SMAJ20CA Diode – 400W, 20V, TVS, Rectifier, SMD Type

The SMAJ20CA is a type of TVS (Transient Voltage Suppression) diode, which is a type of electronic component that is designed to protect sensitive electronic circuits from voltage spikes or transients. This diode has a maximum working voltage of 20 volts and a peak pulse power dissipation of 400 watts.

Part Number: SMAJ20CA

Function: Transient Voltage Suppressor. ( 400W, 20V, TVS )

Package: SMA Type ( Surface Mount )

Manufacturer: Diodes Incorporated.

Image and Pinouts:

SMAJ20CA datasheet


What is SMAJ20CA?

The SMAJ20CA diode is designed to clamp transient voltage spikes to a safe level before they can damage sensitive electronic components. This is 400W, 20V, TVS Diode.

The “SMA” in SMAJ20CA refers to the package type, which is a surface mount package with a rectangular shape and a J-bend lead configuration. The “J” in the part number refers to the fact that the leads of the diode are bent in a J-shape to facilitate mounting on a circuit board.

The “CA” in the part number refers to the tolerance of the diode, which is ±5%. This means that the actual breakdown voltage of the diode may vary by up to 5% from the nominal value of 20 volts.


1. 400W Peak Pulse Power Dissipation
2. Glass Passivated Die Construction
3. Unidirectional and Bidirectional Versions Available
4. Excellent Clamping Capability
5. Fast Response Time
6. Lead Free Finish/RoHS Compliant
7. Green Molding Compound (No Halogen and Antimony)

Mechanical Data

1. Case : SMA
2. Case Material : Molded Plastic. UL Flammability Classification Rating 94V-0
3. Moisture Sensitivity : Level 1 per J-STD-020
4. Terminals : Lead-Free Plating (Matte Tin Finish). Solderable per MIL-STD-202, Method 208
5. Polarity Indicator : Cathode Band (Bi-directional devices do not have a polarity indicator.)
6. Weight: 0.064 grams (Approximate)

Other data sheets are available within the file: SMAJ10CA, SMAJ100CA, SMAJ100A, SMAJ100CA, SMAJ10A



1. What is the difference between a TVS diode and a regular diode?

A TVS diode is specifically designed to protect against voltage spikes or transients, while a regular diode is designed to allow current to flow in only one direction. TVS diodes have a much higher peak power dissipation rating and can handle much higher voltage spikes than regular diodes.

2. What happens when a TVS diode is subjected to a voltage spike?

When a TVS diode is subjected to a voltage spike that exceeds its breakdown voltage, it switches from a high-impedance state to a low-impedance state, effectively shunting the excess voltage away from the sensitive electronic components and dissipating


SMAJ20CA Datasheet PDF Download

SMAJ20CA pdf


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