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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.

DFM 1K JEG

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    \$\begingroup\$ Possibly a TVS diode used as a spike quencher. \$\endgroup\$
    – Andy aka
    Commented Nov 16, 2022 at 21:03
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    \$\begingroup\$ The logo is Littelfuse so it's probably a TVS. Maybe you can measure the dimensions. \$\endgroup\$ Commented Nov 16, 2022 at 21:35

1 Answer 1

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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.

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  • \$\begingroup\$ Good answer and good research \$\endgroup\$
    – Voltage Spike
    Commented Nov 16, 2022 at 23:06
  • \$\begingroup\$ Thank you rdtsc \$\endgroup\$ Commented Nov 17, 2022 at 21:49

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