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Transcend 300S 128GB microSDXC card with SD adapter

Transcend

Transcend 300S 128GB microSDXC UHS-I U3 Class 10 95MB/s 100MB/s

SKU CH-E2S6-T3T6T

A 128 GB microSDXC card with UHS-I U3 and Class 10 ratings delivers 95 MB/s read and 100 MB/s write speeds plus A1 random performance for faster app loading

  • Total capacity128 GB
  • Memory card formatMicro SDXC
  • Speed classClass 10
  • Max read speed95 MB/s
  • Write throughput100
  • Product typeMicroSD
  • 128 GB capacity stores large media libraries
  • 95 MB/s read speed loads files quickly
  • 100 MB/s write speed captures high-bitrate video
  • A1 rating delivers 1500 IOPS random read for fast app launches
  • U3 Class 10 guarantees 10 MB/s sustained sequential performance

128 GB microSDXC for mobile apps

The Transcend 300S is a 128 GB microSDXC card built to the UHS-I U3 Class 10 specification. It includes a full-size SD adapter so the same card works in phones, tablets, action cameras and laptop slots. The A1 Application Performance rating means it is tuned for random access workloads such as running apps directly from the card.

Sequential speed and bus interface

Rated read speed reaches 95 MB/s while write speed is rated at 100 MB/s over the UHS-I bus. The card sustains a minimum sequential write of 10 MB/s, meeting the V30 video standard. Power draw follows the standard UHS-I profile for microSD media, so it draws only what the host slot provides.

Random IOPS under sustained use

The A1 guarantee delivers at least 1,500 random read IOPS and 500 random write IOPS. These figures are maintained during extended app loading and background multitasking, not just in short bursts. The card is not designed for continuous high-bitrate video recording beyond the V30 threshold or for workloads demanding sustained write throughput above 10 MB/s.

How it compares

Measured against everything we stock in SD & MicroSD Memory Cards, at today’s prices. Recalculated every night.

Price $61.99
Pricier than about 58% of the 1,947 comparable items (median $46.99).
Total capacity 128 GB
Higher than about 60% of the 1,132 comparable items (median 64 GB).
Price per TB $484.30 per TB
Pricier than about 61% of the 901 comparable items (median $374.69 per TB).

Specifications

Product
Brand nameTranscend
Product lineUHS-I
Model nameTS128GUSD300S-A
Part numberTS128GUSD300S-A
Total capacity128 GB
Product typeMicroSD
Performance
Speed classClass 10
Max read speed95 MB/s
Write throughput100
Storage
Memory card formatMicro SDXC

Questions about this item

How do I install the Transcend 300S microSDXC card, and which step do people often get wrong?

Insert the 128GB card into your device's microSD slot with the gold contacts facing down until it clicks; the common mistake is using the full-size SD adapter in a microSD-only slot.

What maintenance or replacement will this 300S card need over time?

No scheduled maintenance is required; replace the card if sustained write speeds drop below the 10MB/s sequential floor or if random read IOPS fall under 1,500.

What limit appears first when I record video continuously on this U3 card?

The 100MB/s maximum write speed caps sustained throughput before the 95MB/s read limit becomes relevant.

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