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I have a microSD card reader which needs \$5\,\mathrm{V}\$ to operate.
I am interfacing it with STM32 MCU operating at \$3.3\,\mathrm{V}\$.

Will it operate normally when I provide only \$3.3\,\mathrm{V}\$?

Presently, I do not have \$5\,\mathrm{V}\$ to supply to the card reader but only \$3.3\,\mathrm{V}\$.

Datasheet link is here. enter image description here

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    \$\begingroup\$ What does the datasheet say? \$\endgroup\$ – Hearth Aug 27 at 20:48
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    \$\begingroup\$ microSD card adapters are typically passive devices which operate at whatever voltage is supplied by whatever system you plug them into. \$\endgroup\$ – brhans Aug 27 at 20:49
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    \$\begingroup\$ please be clear in your question. or, you can draw a setup(post an image) to explain it better \$\endgroup\$ – Umar Aug 27 at 21:05
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    \$\begingroup\$ Please clarify what you mean be "microSD card adapter" - is it one of these? hobbycomponents.com/adapters/… \$\endgroup\$ – Bruce Abbott Aug 27 at 21:25
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    \$\begingroup\$ Still unanswerable without documentation of the exact circuitry on board. But you don't need that, it would be simpler to just use a passive breakout. \$\endgroup\$ – Chris Stratton Aug 28 at 1:03
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microSD card adapter operates at 5v when connecting to 3.3v of stm32

No, it doesn't. An SD to microSD card adapter is purely a physical adapter -- there is no level shifting involved. SD and microSD cards both operate at a maximum of 3.3V.

enter image description here

(source)

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