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Small black microSDXC card with gold contacts, labelled 128GB 340S

Transcend

Transcend microSDXC 340S 128GB UHS-I U3 V30 A2 160/125MB/s

SKU CH-8H4C-K7KGR

High-performance microSDXC card with 128GB capacity, UHS-I U3 V30 A2 ratings, and 160/125MB/s speeds for 4K video and fast app loading

  • Total capacity128 GB
  • A2 class accelerates app launches and random data access
  • U3 and V30 ratings sustain 4K and Full HD video capture
  • Sequential read up to 160 MB/s speeds file transfers
  • Sequential write up to 125 MB/s keeps recording smooth
  • 128 GB capacity stores hours of high-resolution footage

Transcend microSDXC 340S 128GB

This 128GB microSDXC card uses UHS-I technology to reach sequential read speeds of 160 MB/s and write speeds of 125 MB/s. It carries U3, V30 and A2 ratings for sustained capture and app performance. The card targets handheld game consoles, smartphones, tablets and digital cameras needing fast random access.

Best for 4K capture and app-heavy devices

The A2 rating ensures quick app launches and smooth random read/write operations on phones or consoles. V30 guarantees a minimum 30 MB/s write speed for uninterrupted 4K video recording. Buyers who need higher sequential throughput for professional video workflows or larger capacities for extensive media libraries should consider other options.

UHS-I U3 V30 A2 speed class

The combined U3, V30 and A2 classifications define the card's guaranteed minimum performance. U3 and V30 both certify a 30 MB/s sustained write floor for 4K video. A2 certifies high random IOPS for responsive app loading. This specification set determines whether the card meets your device's speed requirements.

How it compares

Measured against everything we stock in USB Thumb Drives, at today’s prices. Recalculated every night.

Price $40.99
Pricier than about 59% of the 1,099 comparable items (median $31.99).
Total capacity 128 GB
Higher than about 60% of the 746 comparable items (median 64 GB).
Price per TB $320.23 per TB
Pricier than about 64% of the 600 comparable items (median $226.48 per TB).

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Specifications

Product
Total capacity128 GB

Questions about this item

How do I install the 128GB microSDXC 340S card and what step do people often get wrong?

Insert the card into the device's microSD slot with the label facing up until it clicks. The common mistake is not pushing it in fully so the spring latch does not engage, causing the card to pop out or not be recognised.

What maintenance or replacement will the 340S card need later?

No routine maintenance is required. Replace the card if write speeds drop below the 125 MB/s sequential rating or if the device reports read errors, which can happen after heavy write cycles over time.

What limit shows up first under sustained use on the 340S card?

The V30 rating guarantees a minimum 30 MB/s sustained write speed. Under continuous 4K recording the card will throttle to this floor before the 160 MB/s peak read speed becomes a factor.

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