TF Card vs MicroSD — Is There Actually a Difference?
There is no physical difference: TF (TransFlash) and MicroSD are the same form factor, 15 × 11 × 1 mm. TransFlash was the original name when the format was introduced; MicroSD is the name adopted after the SD Association standardised it, and SDHC and SDXC extend it to higher capacities. Both names are still in commercial use, which is why buyers searching for one term find suppliers using the other. What matters in a specification is not the name but the capacity, the speed class and the silicon grade behind it.
The naming, in order
| Name | Capacity range | What it means |
|---|---|---|
| TransFlash (TF) | Up to 2GB in the original definition | The original name for the format |
| MicroSD | Up to 2GB | Renamed after SD Association adoption |
| MicroSDHC | 4GB to 32GB | High Capacity — SD 2.0 and above |
| MicroSDXC | 64GB to 2TB | Extended Capacity — exFAT formatted |
What this means when you order
- Ask for the capacity and speed class, not the name — "TF card" and "MicroSD card" describe the same object.
- Above 32GB the card is SDXC and is exFAT formatted by default; check that your device supports exFAT.
- Older devices built for MicroSD may not address SDXC capacities — a real compatibility trap when replacing cards in existing hardware.
- The grade of the flash inside is a separate question from the name, and it is the one that affects field behaviour.
Why we use "TF card"
Because that is the term most of our B2B buyers search and specify with, particularly in dashcam, camera and device-integration supply chains. We write "MicroSD class" alongside it where the SD naming matters, so both conventions resolve to the same product.
How to write the specification
Drop the name and write the three figures a factory can build and test against: capacity, speed class, and the intended device. A 4K dashcam wants a MicroSDXC card at U3 or V30, 64 GB or above, exFAT formatted. A device with a fixed TF slot wants the capacity its firmware addresses and a class matched to its write rate. A legacy reader built for SDHC tops out at 32 GB regardless of the label. We produce TF cards from 4 GB to 256 GB and confirm the class on a batch sample before packing, so the number on the quotation is the number in the box.
| If you are building | Specify |
|---|---|
| A 4K dashcam or action camera | MicroSDXC, U3 or V30, 64 GB–256 GB, exFAT |
| A device with a fixed TF slot | Capacity your firmware addresses + a write class matched to the rate |
| A legacy SDHC-only reader | Up to 32 GB — SDXC will not be addressed |
| A promotional or branded giveaway | Capacity for the payload; class is rarely the constraint |
The mistake to avoid
Do not order by the words "TF" or "MicroSD" alone. They describe one physical object, so a supplier can ship either label for the same part — and neither label tells you the capacity, speed class or silicon grade inside. Specifying those three figures is what makes the order verifiable, and it is what we confirm back to you in writing before production. If a quotation gives you only a name, ask for the capacity, class and grade; the name is a convention, not a specification.
Bottom line
- TF and MicroSD are the same physical card — the label is not a specification.
- Specify capacity, speed class and silicon grade; those are what a factory can build and test.
- Check SDHC versus SDXC support before replacing cards in existing hardware.
Not sure which applies to your product?
Send your workload — what writes, how often, at what temperature — and we will propose a configuration with the reasoning. We reply to business enquiries within 1 business day.
Request a quoteFrequently asked questions
Will a card labelled MicroSD work in a device specified for TF?
Yes — same physical and electrical format. What to check is whether the device supports the capacity class (SDHC versus SDXC), not the name on the label.
Do I need SDXC for 64GB and above?
Yes. 64GB and above is SDXC, formatted exFAT. Confirm your host device supports exFAT before specifying it.
Does the name affect price?
No. Capacity, silicon grade and speed class affect price. The name is a naming convention.
Sources
- SD Association — Capacity (SD/SDHC/SDXC/SDUC)
SDHC spans more than 2GB up to 32GB and uses the FAT32 file system; SDXC spans more than 32GB up to 2TB and uses exFAT. Speed grades cover C2/C4/C6/C10, UHS U1/U3, and Video Speed Class V6/V10/V30/V60/V90.
- SD Association — SD Association Fact Sheet
SDHC tops out at 32GB, SDXC at 2TB, and SDUC at 128TB. The SDA is an open industry standards body founded in 2000 by Panasonic, SanDisk and Toshiba; it does not manufacture or sell products itself.
External sources explain industry standards (accessed 2026-10-18); they describe the standard, not WINTEL product parameters.