Sony A6400 Memory Card Compatibility

By Nathaniel Stephan
Last Updated: October 15, 2019
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Sony A6400 Memory Card Compatibility

The Sony A6400 is able to use two types of memory cards. Sony XC-HG Duo, PRO-HG Duo, and PRO Duo are compatible with SD, SDHC, and SDXC cards.

Only one memory card can be in the camera at a time. You'll have to make a choice between an SD or PRO Duo card.

Sony is the owner of the PRO Duo format. Because of that, SD cards are less expensive and frequently have considerably better performance than PRO Duo memory cards.

Here are the best SD memory cards to use in the A6400:

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.

Best A6400 SD Cards

SanDisk, Lexar, and PNY are brands that produce high-quality Memory cards. The best SD cards I have owned have been SanDisk Extreme Pro cards.

That does not mean you need to purchase a card made by SanDisk for your Sony ILCE-6400. Just make sure the name sounds cool. That will ensure you get fast transfer rates, shock resistance, and more features.

I have not had problems with Lexar Professional or PNY Elite Performance SD cards.

The problems I have had with SD cards has been when inexpensive no name brands were used. Not having a brand name increases the chance of card failure or data corruption.

If you want to spend less, don't buy a generic card. You will be better off buying a high-quality card with a reduced storage capacity.

Recommended SD Cards

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I.
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.
Lexar Professional 1066X 128GB SD UHS-I Memory Card

Lexar Professional 1066x 128GB SD Card

  • Lexar Professional Silver Card.
  • Transfer speeds up to 160 MB/s.
  • Class 10 & UHS-I.
  • Includes Lexar Recovery Tool Software.
  • Designed for durability in harsh conditions.

Check price at: Amazon, Adorama, eBay

PNY Elite Performance SDXC 128GB Memory Card

PNY Elite Performance 128GB SD Card

  • Lower priced card.
  • Transfer speeds up to 95 MB/s.
  • Class 10 & UHS-I.
  • Magnet, Shock, Temperature, and Waterproof.

Check price at: Amazon, Adorama, eBay

Sony A6400 SD Card Compatibility

SD, SDHC, and SDXC memory cards can be used with the Sony A6400. Use a card to get the best overall performance from the A6400.

The latest SDUC cards are not compatible with the A6400.

There are four different specs of Secure Digital (SD) cards. Newer memory specs increase tech that allows for increased memory capacity and faster transfer rates.

  • Secure Digital (SD) - 128MB to 2GB.
  • Secure Digital High Capacity (SDHC) - 4GB to 32GB.
  • Secure Digital eXtended Capacity (SDXC) - 64GB to 2TB.
  • Secure Digital Ultra Capacity (SDUC) - 4TB to 128TB.

SD Card Speed

The speed rating of an SD card is based on the sequential write and read speeds. Card continuous write speed is important for video and continuous shooting to work as intended on the A6400.

Slows cards can decrease the number of continuous frames the Sony A6400 can take. This is due to the camera's buffer not being able to write to the SD card fast enough.

With video, a slow SD card can cause a sudden error that causes the recording to end. The video file might also be corrupted. If you are going to capture video, it is important the memory card you use meets the required minimum continuous write speed for video.

Card read speed is important for transferring files to a computer. If you have cards that are full, a memory card with a fast read speed will decrease the transfer time.

Speed Class Rating

Example of where to find SD Card Speed Class
10 inside of a C showing that the SD card is Class 10.

The Sony A6400 requires no less than a Class 4 SD card.

A SD memory card gets a Class rating based on the sustained data write speed of the memory card. Class 10 is the top rating, even though memory cards are for sale that are many times faster.

Here you can see all of the Classes and the applicable lowest read/write speeds:

  • Class 2 - 2MB/s
  • Class 4 - 4MB/s
  • Class 6 - 6MB/s
  • Class 8 - 8MB/s
  • Class 10 - 10MB/s or faster

Virtually any memory card worth deciding to buy for the Sony A6400 will be a Class 10 card. In the short time since the launch of the camera, SD cards have gotten much faster.

Ultra High Speed (UHS)

Example of an SD memory card with a UHS-I rating.
This card has a UHS-I rating. UHS-II and UHS-III cards will have II or III, respectively.

The Ultra High Speed (UHS) bus is available in SDHC, SDXC, and SDUC cards. UHS allows provides a way to improve file transfer rates.

There are three separate versions. They are UHS-I, UHS-II, and UHS-III.

To find out the rating of a memory card, look at the front of the card. If the card has UHS, a Roman numeral I, II, or III can be seen on the memory card label.

  • UHS-I - Maximum transfer rate of 104 MB/s
  • UHS-II - Maximum transfer rate of 312 MB/s
  • UHS-III - Maximum transfer rate of 624 MB/s

Sony A6400 PRO Duo Card Compatibility

One PRO Duo or PRO-HG Duo memory cards can be used in the Sony A6400. What PRO-HG signifies is that the memory card has a minimum read speed of 50mb/s and a 15mb/s minimum write speed.

PRO Duo cards are consistently double the price of an SD card. I would not recommend purchasing a Sony PRO Duo card for use with a A6400 due to the increase in price.

Memory Card Image Capacity

Sony SD Memory Card Contacts

Below is an approximate estimation of how many large JPEG images you can expect to store on each size of SD card.

  • 32GB - 9,280 images
  • 64GB - 18,560 images
  • 128GB - 37,120 images
  • 256GB - 74,240 images
  • 512GB - 148,4800 images

Related Sony Cameras

There is not anything else you need to determine about PRO Duo and SD cards. The SanDisk Extreme Pro 128GB is the best Sony ILCE-6400 memory card.

Here are a few more cameras that use similar memory cards as the Sony A6400:

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