Transcend microSD 300S

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Want to save space on your mobile device by running apps from a memory card? Transcend’s microSDXC/SDHC 300S cards are the right choice! Compliant with the latest speed class, the cards boast excellent random read/write speed, perfect for retrieving small pieces of data from random locations and speeding app launch time.

A good fit for mobile app storage
It’s common for users to install and run mobile apps from microSD cards in order to free device memory. Random read/write performance is thus crucial. Transcend’s microSDXC/SDHC 300S memory cards are a great fit for storing mobile apps.

Introducing Application Performance Class

The Application Performance Class was introduced to adapt this new trend. Transcend’s microSDXC/SDHC 300S memory cards meet the new A1 standards, delivering minimum random read of 1,500 IOPS and random write of 500 IOPS, and sustained sequential speeds of at least 10MB/s.

A1 compliance applies only to 32GB-512GB capacity cards.

Show the transfer capabilities

Transcend’s microSDXC/SDHC 300S memory cards meet both the UHS Speed Class 3 (U3) and the UHS Video Speed Class 30 (V30) standards for 4K Ultra HD video recordings, with read/write speeds of up to 100MB/s and 85MB/s respectively.

U3 and V30 compliance applies only to 128GB-512GB capacity cards.


Store as many as you wish

In addition to excellent random read/write performance, Transcend’s microSDXC/SDHC 300S memory cards come in up to 512GB storage capacity, allowing you to keep more digital files and apps at hand!

Built for extremes


To deliver the best performance and stability, Transcend’s microSD memory cards are tested to withstand extreme conditions. They are temperature resistant, waterproof, shock proof, X-ray proof, and static proof.


RecoveRx software

Transcend offers exclusive RecoveRx software, a free data recovery utility that allows you to search deep within a storage device for traces of erased files including digital photos, documents, music and videos




Dimensions 11 mm x 15 mm x 1 mm (0.43″ x 0.59″ x 0.04″)
Weight 0.4 g (0.01 oz)


  • 4 GB/
  • 8 GB/
  • 16 GB/
  • 32 GB/
  • 64 GB/
  • 128 GB/
  • 256 GB/
  • 512 GB
Flash Type
  • 3D NAND flash
  • 2D NAND flash

Operating Environment

Operating Temperature -25°C (-13°F) ~ 85°C (185°F)
Operating Voltage
  • 2.7V ~ 3.6V


Speed Class
  • UHS-I U3
  • UHS-I U1
  • Class 10
  • V30
  • A1
Sequential Read/Write (CrystalDiskMark)
  • 512 GB

    up to 100/85 MB/s

  • 256 GB

    up to 100/40 MB/s

  • 128 GB

    up to 100/40 MB/s

  • 64 GB

    up to 100/20 MB/s

  • 32 GB

    up to 100/20 MB/s

  • 16 GB

    up to 95/10 MB/s

  • 8 GB

    up to 20/10 MB/s

  • 4 GB

    up to 20/10 MB/s

Insertion/Removal Cycles 10,000
  • Speed may vary due to host hardware, software, usage, and storage capacity.


  • CE/
  • FCC/
  • RCM/
  • EAC/
  • UKCA
  • Five-year Limited Warranty
Warranty Policy
  • Please click here for more information about the Transcend Warranty Policy.


Gold – Editor’s Choice


Gold Award


Editor’s Choice

GreenTech Reviews

Order Information


  • TS4GUSD300S microSDHC, C10 / 2D NAND Flash


  • TS8GUSD300S microSDHC, C10 / 2D NAND Flash


  • TS16GUSD300S microSDHC, C10, U1 / 2D NAND Flash
  • TS16GUSD300S-A microSDHC I, C10, U1 (with adapter) / 2D NAND Flash


  • TS32GUSD300S microSDHC, C10, U1, A1 / 3D NAND Flash
  • TS32GUSD300S-A microSDHC I, C10, U1, A1 (with adapter) / 3D NAND Flash


  • TS64GUSD300S microSDXC I, C10, U1, A1 / 3D NAND Flash
  • TS64GUSD300S-A microSDXC I, C10, U1, A1 (with adapter) / 3D NAND Flash


  • TS128GUSD300S microSDXC, U3, V30, A1 / 3D NAND Flash
  • TS128GUSD300S-A microSDXC I, U3, V30, A1 (with adapter) / 3D NAND Flash


  • TS256GUSD300S-A microSDXC I, U3, V30, A1 (with adapter) / 3D NAND Flash


  • TS512GUSD300S-A microSDXC I, U3, V30, A1 (with adapter) / 3D NAND Flash

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