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Anyone know what this chip is? The dimensions are approx 4mm by 2.5mm. Also I believe one of the pins is connected to Vout of a voltage regulator. Could it be a voltage detector?

Chip with 4 pins and HPTD part marking

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    \$\begingroup\$ Looks like an optoisolator. Where exactly this is, what's around it, is it a power supply with this chip between mains and low volage side? \$\endgroup\$
    – Justme
    Commented Jul 8 at 10:12

1 Answer 1

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It's an Isocom Components ISP281D optocoupler.

enter image description here

enter image description here

(Source: lcsc.com)

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