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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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closed as unclear what you're asking by brhans, Chris Stratton, Finbarr, Bruce Abbott, Elliot Alderson Aug 27 at 22:57

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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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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