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Small rectangular SDXC card in black and grey, 128GB capacity, UHS-I U3 V30 A2 labels

Transcend

Transcend SD 340S UHS-I U3 V30 A2 128GB memory card

SKU CH-Y840-2X60D

128GB SDXC card delivers 160MB/s read and 90MB/s write speeds for smooth 4K video capture

  • TypeSecure Digital (SD)
  • Capacity128GB
  • 128GB capacity stores thousands of photos and hours of 4K video
  • Read speeds up to 160MB/s transfer large files quickly
  • Write speeds up to 90MB/s sustain 4K recording without dropped frames
  • V30 rating guarantees minimum 30MB/s for smooth 4K capture
  • A2 compliant for fast app loading on mobile devices

Transcend SD 340S 128GB card

The Transcend SD 340S is a 128GB SDXC memory card built for UHS-I compatible DSLR cameras and camcorders. It targets photographers and videographers who need reliable storage for high-resolution stills and 4K video workflows.

Sustained 4K video and burst performance

The card meets V30 and U3 ratings to guarantee a minimum sequential write speed of 30MB/s for uninterrupted 4K capture. Read speeds reach up to 160MB/s and write speeds up to 90MB/s, while A2 compliance supports faster app loading on mobile devices.

Check device compatibility before ordering

Verify that your camera or camcorder supports SDXC cards and the UHS-I bus to use the quoted transfer rates. Older SDHC-only hosts will not recognise the 128GB capacity, and non-UHS devices will fall back to lower speeds.

Highlights

  • 128GB capacity stores thousands of photos and hours of 4K video
  • Read speeds up to 160MB/s transfer large files quickly
  • Write speeds up to 90MB/s sustain 4K recording without dropped frames
  • V30 rating guarantees minimum 30MB/s for smooth 4K capture
  • A2 compliant for fast app loading on mobile devices

Specifications

TypeSecure Digital (SD)
Capacity128GB

Questions about this item

Does the 340S generate noticeable heat or draw extra power when recording 4K video all day?

The card is passive with no moving parts, so it produces negligible heat and its power draw stays within the standard SD bus limits even during sustained 4K capture.

What device slot or adapter do I need to use this 128GB card?

You need a UHS-I compatible SDXC slot — found in most modern DSLRs, mirrorless cameras and camcorders — or a UHS-I SD card reader for offloading to a computer.

Will the 340S work at full speed in an older camera that only supports UHS-I U1?

The card is backward compatible; it will function in a U1 device but speeds will be limited to that camera's maximum U1 rating.

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