Wholesale GaN Chargers 20W from China
The 20W GaN charger became the default power brick of the phone era: small enough for a pocket, fast enough for modern devices, and sold by the million into retail, promotional and bundle channels. Gallium nitride parts run cooler than old silicon designs, which is where the size advantage comes from, and where the substitution temptation comes from too.
The failures: chargers built with silicon parts and marketed as GaN, safety certifications that belong to a different product than the one in the box, and protocol support claimed on the listing but missing from the circuit, so the fast charge never negotiates.
All three are detectable with a multimeter, a load tester and a certificate check. The category context is in our wholesale electronics overview.
Component, certification and protocol
GaN is a component decision inside the circuit, and the genuine article shows in the efficiency curve and the temperature under load. The certification is the compliance spine: destination market safety marks apply to the exact model, and the certificate must name the model you are buying, not a cousin.
Protocol support is the buyer’s experience: USB Power Delivery for phones and tablets, and the negotiation profile decides whether a device charges fast or politely trickle charges. A charger that supports the protocol on the label but not in the silicon generates the quietest returns in electronics: the customer thinks their phone is broken.
Specifications and minimum order
Component prices move with semiconductor markets, so live figures come with the quotation. Fix these points.
| Specification | What to confirm before you order |
|---|---|
| Component | GaN named by the actual part in the circuit, verified on teardown |
| Output | Wattage and the voltage and current profile per protocol |
| Protocols | USB PD and any fast charge families, verified with a protocol tester |
| Safety | Certification marks for the destination market, model matched |
| Thermal | Surface temperature under full load, as a tested number |
| Plug | Pin standard for the destination market, fixed or interchangeable |
| Minimum order | Hundreds per model in practice; certification costs set the floor per model per market |
Our minimum order is 1 piece, so the unit is load tested and its certificates matched before any production commitment. The production minimum follows the model and its certification, and we confirm it in writing. Our sourcing service screens the assembly plants, which range from disciplined to rebranding workshops.
The certificate must name your model
Electronics compliance has a paperwork trap specific to this trade: factories hold certificates, and the certificate you are shown may cover a similar model, an earlier revision or another factory’s product entirely. The verification is unglamorous: match the model number, the circuit and the factory name on the certificate to the unit in the carton.
Burn in is the second discipline. A load tester at full wattage for an hour reveals thermal shortcuts, component grades and solder quality that a showroom charge cycle never touches. Our quality assurance service builds both checks into the order.
What belongs in the purchase order
- GaN component named, with teardown verification as standard
- Output profile per protocol, verified with a protocol tester
- Safety certification with the model number matched to your order
- Thermal limit under full load as a number
- Plug standard for the destination market
- Packing: retail or bulk, manual language set and carton limits
Checks that catch the repeat failures
- Load burn in. Run bulk units at full load for an hour; thermal shortcuts and weak solder show by the end.
- Protocol test. Negotiate with a protocol tester; the fast charge profile either exists or it does not.
- Certificate match. Compare model, circuit and factory on the certificate against the carton unit.
- Teardown sample. Open one bulk unit per lot; the component on the board answers the GaN question permanently.
- Pin and insulation check. Verify plug dimensions and insulation to the destination standard.
These checks are standard work in a pre shipment inspection, and our factory inspection service covers charger plants. For how electronics ship, see our freight forwarder guide.
Frequently asked questions
How do I verify it is really GaN?
Two ways: the certificate and teardown answer the paper question, and a load test with temperature measurement answers the physics question. A charger that runs hot at full load is not a GaN design regardless of the box. Our minimum order is 1 piece for sampling either answer.
Which certifications do I actually need?
The safety and electromagnetic marks for your destination market, applied to the exact model. We list them per market before production and match the certificates to the carton units, because a certificate for a different model is worse than none.
Why do some chargers charge slowly on certain phones?
Protocol negotiation. The charger and the device agree on a profile, and a missing profile falls back to a safe slow rate. Verify the protocol list with a tester on bulk units and the complaint disappears from your reviews.
Request a quotation
Send the market, the devices your customers charge and the quantity. We come back with model options plus the workable minimum within two business days.
