Choosing the right microSD card for your smartphone

microSD card
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It seems incredible that something so small generate so many conflicting passions. However, it is like this. The use of microSD cards in smartphones is irrelevant to a large group of users, but absolutely essential for many others. Both carry a point.

If your smartphone has microSD card slot or plan to buy one of the new models with it, notes the differences between cards: capacity, type of card or keys to understanding the speed figures. We have also selected for you what we consider now the top 7 microSD cards whether you are looking for high capacity microSD cheaper or faster.

Today in our smartphones we have more applications, more 4K video recording and pictures we took or send us contacts. A bottomless pit which in some cases can end our available internal space. There’s the great value of microSD cards that with the new LG G5 and Galaxy S7, it appears that strong comeback as a star feature even the high end.

Types of memory cards microSD

Although we generally refer to as SD memory cards to dry, the reality is that in the market there are three main types: SD, SDHC and SDXC. The differences between them does not affect more than the maximum capacity that can reach each of them, so, depending on the capacity you want, you have to choose one kind or another.

The type of memory card is always indicated clearly in each model. According to the original specification, which are SD type can have a maximum capacity of 2 GB, although you can find models that surpass that figure. The high, called SDHC capacity can be up to 32 GB while the SDXC are able to reach 2 TB.

The other unknown to determine the ability to choose a microSD card for our smartphones is the maximum that accepts each model, as more capacity cards are not compatible with models that do not support this specification bypasses.

Here you should consult the manufacturer or the technical specifications of the particular model, but we leave you with a summary table with some of the best selling models.



2 TB

HTC One A9

2 TB

Alcatel Idol4

512 GB

Samsung Galaxy S7

200 GB

Sony Xperia Z5

200 GB

Moto X Play

128 GB

Moto G 2015

32 GB

ASUS Zenphone 2

64 GB

The speed of the cards: UHS classes and classification

Once we clear the maximum capacity card in theory supports our smarpthone and we want to buy according to our needs and base smarpthone living memory, get to choose the speed of the card, which is the second element to consider basic form.

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In a memory card always, we will have the call class or Speed ​​Class. This number, which is usually surrounded, we mark the minimum write speed sustained that guarantees that card type. It is measured in MB / s and this table is a summary of current:


Class 2

2MB / s

Class 4

4 MB / s

Class 6

6 MB / s

Class 8

8 MB / s

Class 10

10MB / s

Some card model also includes labeling a figure of speed in this case corresponds to the maximum speed of reading and writing that is capable of reaching the card. Typically , these measures, especially peak, peaks are not specific speed and steadily. Are also expressed in MB / s maximum speed for the type of bus use is 25 MB / s.

This card has a minimum write speed of 10MB / s (Class 10) but we also marks the highest reading and writing (95 and 90 MB / s)

With the advent of SDHC and SDXC cards, the SD Association introduced a new class that leverages the new bus of these cards: UHS Speed ​​Class. With it a new reference (one that I can see with the type of card) that now can be introduced into the tiny cards:

  • UHS-I Class 1 (U1) : Minimum speed of 10 MB / s
  • UHS-I Class 3 (U3) : Minimum speed of 30 MB / s

In these specifications, the theoretical maximum speeds are 50 and 104 MB / s respectively, but recently that UHS has left the market new cards UHS-II Class 3, which are prepared to reach transfer speeds of up to 312 MB ​​/ s.

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This new reference (UHS) is held together with the original Speed ​​Class. For this reason, if your smartphone supports a particular capability but not the UHS bus, the reference speed must search the number of the Speed ​​Class. This is the case of UHS-I Class 10 cards: if your computer does not support the new bus, the minimum speed reference mark class 10, i.e. 10 MB / s.

Note the speed of a microSD card for a smartphone is key to have adequate experience. Recommended in the new smartphones at least Class 10, but if we’re going to work with 4K video, the best option would be to already have models with the UHS-I bus, which is compatible with most current smarpthones.

In a microSD card, write speed smarpthone unless the card that we will use mainly to read and play multimedia content on the smartphone screen is especially important.

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