Can anyone please help me to find what SMD component this is?
It is connected to 24 VDC on one side side (positive) and the other side to negative.
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4\$\begingroup\$ Possibly a TVS diode used as a spike quencher. \$\endgroup\$– Andy akaNov 16, 2022 at 21:03
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3\$\begingroup\$ The logo is Littelfuse so it's probably a TVS. Maybe you can measure the dimensions. \$\endgroup\$– Spehro PefhanyNov 16, 2022 at 21:35
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1 Answer
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Marking DFM could be a SMLJ33CA (Micro commercial components corp) from a google search.
Looking up SMLJ33CA at www.littelfuse.com under Competitor Cross Reference, several candidates are shown. Looking through them, of course the last one shows a match. Marking DFM is Littelfuse model SMDJ33CA-HR.
This is a 33 Volt TVS or Transient Voltage Suppressor. These are like Zener diodes, in that once a certain threshold voltage is reached, they start to conduct. The net effect is that they clamp a voltage surge and prevent it from getting much higher.
These are commonly used on the power inputs of devices to prevent damage from over-voltage stress.
