SMD TVS Diode SMAJ30CA 400W Bidirectional SMA DO-214AC
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Prices updated: 13 Oct 2026
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About this product
SMAJ30CA is a bidirectional TVS (transient voltage suppression) diode rated for 400 W peak pulse power in an SMA (DO-214AC) surface-mount package. It clamps fast transients such as ESD, switching spikes and lightning-induced surges on I/O lines, VCC buses and power inputs. Its 30 V standoff voltage keeps it inactive on circuits operating up to about 30 V.
Specifications
- Type
- Bidirectional TVS diode
- Peak pulse power
- 400 W
- Standoff voltage (VRWM)
- 30 V
- Package
- SMA (DO-214AC)
- Mounting
- Surface mount (SMD)
Frequently asked questions
How do I connect SMAJ30CA to protect a line?
Connect it in parallel with the line you want to protect, between the signal or supply rail and ground. Because it is bidirectional, polarity does not matter and it clamps both positive and negative transients.
How do I choose the right standoff voltage?
Choose a standoff voltage above the highest normal operating voltage of the line so the diode stays off during normal use. The 30 V version suits lines operating up to about 30 V; for higher voltages pick a part with a higher standoff.