What goes into an FCC supplier’s declaration of conformity file for a USB charger?

Main answer · Wecent Editorial Team

Short answer: Under FCC rules, Class B external switching power supplies can be authorized by SDoC or certification. For SDoC, the file normally holds the test report to the applicable Part 15 requirements, product identification, the compliance statement, and details of the responsible party in the United States. Keep the test records, and supply the compliance information with the product. Check your product’s exact scope with a lab.

What SDoC is

Supplier’s Declaration of Conformity is a procedure where the responsible party tests the product, or has it tested, and declares that it complies. There is no FCC grant of certification, but the party remains responsible.

Does it apply to a charger?

FCC rules for unintentional radiators list Class B external switching power supplies as products that may be authorized by SDoC or certification. Whether a particular charger needs this, and which rules apply, depends on its circuits and features. A charger with a radio, such as a wireless charger with other functions, may need other approval. Check with an accredited lab.

What a good file contains

1. Product identification. The name, model number and variants, with photos and the label.
2. Compliance statement. The statement that the product complies with Part 15, as required.
3. Responsible party. The name, address and contact details of the party in the United States.
4. Test report. From a competent lab, to the applicable standard and limits, for the model sold.
5. Test setup. Description of the product, cables, loads and configuration tested.
6. Design and parts. Block diagram, schematics and key parts list, as needed to show that tested units match production.
7. Label and manual. The label, and the user information with the compliance statement.
8. Change control. Notes on any change since the testing, with an assessment of the need to retest.
9. Records. Dates, who signed, and where originals are kept.

What must go with the product

The FCC requires a compliance information statement to be provided with the product at the time of marketing or importation. It can be in the manual or on a separate sheet, and may be provided electronically as the rules allow. It identifies the product, states compliance and names the responsible party in the US.

Keep it ready

Records should be ready if the FCC or a customer asks. Store them in an organised way for each model.

Check the details

Read the official sections of the rules cited below, and ask the lab to confirm the correct rule parts and limits for your model.

Quick summary

Test, declare, identify the US responsible party, provide the compliance statement with the product and keep the records.

Sources checked on 24 Oct 2026: eCFR: 47 CFR 2.1077 Compliance information; eCFR: 47 CFR Part 15 Subpart B Unintentional radiators; FCC: Equipment Authorization.

Where this answer says to confirm with Wecent, the detail is not published on the product page and has to come from the datasheet or the factory. General facts come from the regulators, standards bodies or device makers named in the text.