Before you order memory cards from YOULEN

Your proposal identifies the speed class and reference read/write results for the selected capacity.

V30 (Video Speed Class) and A2 (Application Performance Class) are not standard across our range. We confirm requested performance and marks before sample or artwork approval.

UHS means Ultra High Speed. A U3 card is not automatically a V30 or A2 card.

The proposal identifies the flash brand and the selected configuration. The brand alone does not establish the flash technology or grade.

Our sheet includes 0°C–70°C and −25°C–85°C configurations. The range and repeated-writing capability belong to the selected card, not every card we supply.

If you require TLC (triple-level cell), QLC (quad-level cell) or a particular material grade, we check that requirement for the proposed configuration. We do not infer it from the brand name.

For camera and recorder applications, our test setups also record and overwrite footage repeatedly. This is separate from the finished-card checks.

You still need a sample that works in your own product. We help discuss the recording or playback checks; customers usually validate audio, learning-device and toy samples in their own equipment.

The approved sample code links to its configuration and test information. A speed result alone does not prove compatibility with every device.

The sample’s laser-engraved code lets us look up its configuration and test information. We can discuss your component restrictions before sample approval.

If component availability requires a BOM change, we provide a new sample at least one month before the proposed change for your testing and confirmation.

You can test the proposed replacement before accepting the change. We do not treat a different configuration as equivalent simply because the capacity is the same.

Shenzhen Youlen Electronics Co., Ltd. is an SD Association member. That membership is different from the SD-3C card-manufacturing license held by Shenzhen Youlin Semiconductor Co., Ltd. We identify both legal names so you know which record supports which claim.

The SD-3C license covers selected card types under its agreement. The public listing alone does not show the complete product scope. We need to establish the manufacturing entity, card type and permitted microSD names or logos for your proposed order.

Your own brand is not automatically granted every right by our membership or the licensing record. Whether your brand needs a separate agreement, and whether UHS-I, U3, V30 or A2 marks may be used, must be resolved for the manufacturing arrangement and product before artwork approval.

User-caused damage is excluded. Returned used cards are inspected and assessed before replacement.

We explain coverage, returns and shipping arrangements with the order. Our standard warranty is one year, not three or five years.

A selected supply plan can also include an agreed one-year in-use failure-rate limit. This is a commercial commitment for that plan, not a historical defect-rate statistic.

You can view the certificate copies on our Quality & Testing page.

Product documents such as Restriction of Hazardous Substances (RoHS) reports must match the proposed product and target market. Our archived reports cover particular samples, not an automatic whole-range claim.

If you need UK or EU market documents, we first check which existing documents match your order and which requested evidence is still missing.

Commercial use describes the buying purpose, not a separate official speed class. A camera needs repeated writing; a preloaded audio player may mainly read files.

This is a different purchasing task from choosing a major-brand retail card by its advertised maximum speed, or ordering a promotional card mainly for its printed logo. Those products are not automatically better or worse; the requirements are different.

You get configuration advice, sample confirmation, testing, controlled changes and warranty support. We do not present a cost-focused card as a direct equivalent to every premium retail model.