How do you compare a GaN adapter with a traditional adapter for resale?

How do you compare a GaN adapter with a traditional adapter for resale?

A GaN print on the carton has not written quality. The mark names the semiconductor in the power switch, not the rest of the brick. GaN — gallium nitride — sits in that switch. A traditional adapter in this comparison uses a silicon MOSFET — metal-oxide-semiconductor field-effect transistor — in the same slot. Published vendor language says GaN can switch faster, which is why the brick can be smaller and run cooler. USB PD — Power Delivery, the USB charging handshake — and load stability are separate cells. They are not granted by the FET material.

A repair-shop or parts reseller ranking two 65 W bricks by whether one carton says GaN is not asking which FET is newer. What follows names the extra cells. It does not invent a size-reduction percentage, an efficiency percentage, or a case-temperature delta.

Why does a GaN label not settle the resale buy?

The label leaves the protocol and the load unread. The FET material can change how fast the switch chops current, but it does not write which PD contracts the port advertises, and it does not write whether voltage holds when the notebook draws current. Ranking two SKUs — stock-keeping units, one sellable revision each — by whether both PDFs say GaN is still a miss: the semiconductor line matches, the PD cell and the load cell do not. A price premium that only repeats "newer technology" has not filled those cells.

Ask whether PD contracts and load-test data sit on the same confirmation. A cheaper silicon brick does not become a PD pass because the unit price is lower. A dearer GaN brick does not become a load pass because the carton prints GaN.

What does GaN actually change in the adapter?

It can change switching frequency, which is the size and heat story. It does not replace a PD controller or a load curve. Infineon, What is a GaN charger and how does it work?, infineon.com/product-information/what-is-a-gan-charger-and-how-does-it-work, read 7 September 2026, states that a GaN charger uses gallium nitride transistors instead of traditional silicon MOSFETs to convert AC from the wall into DC. The page heading names smaller, cooler, and more efficient chargers. GaN power transistors can switch at hundreds of kilohertz or even megahertz. Traditional silicon power MOSFETs are generally bound to switching speeds under 100 kHz.

That is why two bricks with the same watt nameplate can differ in volume and in how hot the case feels. The same Infineon page publishes a power-density comparison of 3 to 5 W/in⊃3; with silicon MOSFETs versus 9 to 18+ W/in⊃3; with GaN. That range is Infineon's published vendor language, not a MILDTRANS measurement. Do not copy it onto a quote as a house figure, and do not copy a 40–60% smaller line from other Infineon examples as a house specification. The FET is one part. Magnetics, layout, and the PD controller still have to be designed.

Does GaN write USB PD or load stability?

No. PD is a protocol outside the power stage. Load stability is voltage under current. USB-IF, USB Charger (USB Power Delivery), usb.org/usb-charger-pd, read 7 September 2026, states that the USB Power Delivery Specification enables more flexible power delivery along with data over a single cable, and that USB PD Revision 3.1 enables delivering up to 240 W over a full-featured USB Type-C cable and connector. Naming 240 W is not a house SKU. Naming PD 3.1 is not a GaN FET feature.

The handshake sits beside the converter. It is not inside the GaN die. USB-IF's USB Power Supply Interface white paper, usb.org/sites/default/files/USB_PS_Interface_V1_00_20140414.pdf, read 7 September 2026, states that Policy/Intelligence and knowledge of PD communication will reside outside of the Power Supply, and that a Device Policy Engine can communicate with a Power Supply to provide the required voltage and current over VBUS.

A published GaN brick still treats the protocol as its own part. Infineon/GaN Systems GS-EVB-ADP-65WQR-GS1 user manual, infineon.com/assets/row/public/documents/24/44/infineon-gs-evb-adp-65wqr-gs1-usermanual-en.pdf, read 7 September 2026, describes a 65 W USB-C adapter that uses a 650 V GaN transistor on the primary, and on the output side a dedicated Power Delivery protocol controller to support Type-C PD. Do not copy the manual's peak-efficiency or cased-density figures onto a confirmation. UL 62368-1 shop page, read 6 September 2026, states that the document does not include requirements for performance or functional characteristics of equipment. A GaN print is not an LVD pass, and an LVD file is not a PD or load pass.

How do ordinary adapter matching cells sit beside GaN versus silicon?

They sit on top of the FET line. They do not replace it. Industry matching on notebook adapters still uses voltage, capacity, power, charge and discharge behaviour, internal resistance, protection, interface, load capability, and PD protocol. That list is a general check frame, not a named house method. PD protocol is one cell. Load capability is another. A GaN print fills neither. A silicon MOSFET brick that names its PD contracts and its voltage under load has written more for resale than a GaN carton that only repeats the semiconductor.

MILDTRANS is a buying-and-shipping house, not a factory, and adapters are a core sold line. Outbound adapter checks are written as voltage, capacity, power, charge/discharge, internal resistance, protection, interface, load capability, and PD protocol. Those checks can sit on a confirmation. They are not a zero-error claim, and they are not a GaN-quality datasheet. House QC for batteries and adapters references IEC standards as an input beside original-spec, customer requirement, and golden sample. The internal QC table is not published. That unpublished table is not a named GaN BOM, and it is not a PD-contract matrix.

Battery and adapter warranty is 12 months. Notebook-adapter CE-series papers include LVD to EN IEC 62368-1. EMC, RoHS, and LVD papers on sold categories are held by the associated company Shenzhen Glory Energytech Co., Ltd. (深圳市荣焕科技有限公司). That LVD paper is a safety file. It is not a GaN or PD pass. Do not write those CE numbers as a semiconductor upgrade.

Shenzhen Mildtrans Industrial Co., Ltd. (深圳市中川实业有限公司) dates from 2004. Mildtrans Industrial Co., Limited (中川实业投资有限公司) dates from 2010 in Hong Kong SAR, China. Most invoices use the Hong Kong name. Mixed models start at five pieces, or two for a trial. Ordinary outbound time is 7–15 days. Same-day is not the standing policy. Money moves as T/T — telegraphic transfer — through HSBC. A letter of credit is refused. Brazil is not on operated DDP.

A two-piece trial can start an adapter SKU that names the FET family, the PD contracts, and voltage under load. A bulk invoice that only attaches a GaN marketing line is not a substitute for those two extra cells.

How do a GaN marketing line and a silicon brick with named PD and load sit side by side?

They are not the same kind of paper. The table below is the check before the first bulk T/T. If a seller will only quote GaN, leave the PD and load columns unused. A complete sheet names the FET family, the advertised PD contracts, and voltage under load. A dearer GaN print does not become those cells because the unit price is higher.

Key Facts

· GaN versus a traditional silicon MOSFET adapter is a FET-material split. Faster switching is the published size and heat story.

· USB PD is a protocol. USB-IF writes that PD intelligence sits outside the power supply. A published 65 W GaN brick still uses a dedicated PD controller.

· Load stability is voltage under current. A GaN print does not write that cell. UL 62368-1 does not include performance.

· Infineon's 3 to 5 versus 9 to 18+ W/in⊃3; range is vendor language. Do not copy it, or a 40–60% smaller line, as a house figure.

· Matching still writes PD protocol and load capability as two cells. A GaN carton fills neither.

· MILDTRANS writes PD and load as outbound matching cells. That is not a GaN-quality datasheet. A two-piece trial can start a SKU that names FET, PD, and load. Ordinary outbound is still 7–15 days.

What if the seller only quotes GaN as newer technology?

Leave that sheet unused for PD and load. Ask whether advertised PD contracts and voltage under load are named on the same confirmation. A price cut does not write the protocol, and a price premium does not write the load. Until those two extra cells are named, treat a quote that only repeats GaN as unread. The same stop applies if the seller invents a size-reduction percentage, an efficiency percentage, or a case-temperature delta. No public source found on the Infineon GaN charger page or the USB-IF PD page for a MILDTRANS house table of those figures. Do not fill them in.

FAQ

How do you compare a GaN adapter with a traditional adapter for resale?

Do not stop at the FET print. GaN can switch faster than a silicon MOSFET, which is why the brick can be smaller and cooler. Ask PD contracts and load-test data on the same confirmation. Do not treat GaN as newer-therefore-better. Do not invent a size-reduction percentage.

Does a GaN FET implement USB PD?

No. USB-IF describes USB Power Delivery as a specification for flexible power over a cable. The USB Power Supply Interface white paper, read 7 September 2026, puts PD intelligence outside the power supply. Infineon's 65 W GaN evaluation adapter still names a dedicated PD protocol controller. Ask which contracts the SKU advertises.

Does GaN prove the adapter holds full load?

No. Load is voltage under current. The FET material does not write that cell. UL 62368-1 does not include performance. Ask voltage at full load, or at stepped loads, on the confirmation.

Can a silicon MOSFET brick be the better resale spare?

Yes, if it names PD contracts and voltage under load, and the GaN carton does not. Size and heat are the semiconductor story. Resale matching still needs protocol and load. A larger silicon brick is not a PD fail.

Do MILDTRANS outbound adapter checks replace a GaN-versus-silicon datasheet?

No. Outbound checks are written as voltage, capacity, power, charge/discharge, internal resistance, protection, interface, load, and PD. PD and load are two cells. They can sit on a confirmation. They are not a GaN-quality pass and not a zero-error claim. Associated-company CE EMC/RoHS/LVD papers are a different pack, held by Shenzhen Glory Energytech Co., Ltd.

Can a two-piece trial skip naming PD and load?

No. Mixed models can start at two pieces for a trial. That trial can start a SKU that names the FET family, the PD contracts, and voltage under load. It does not turn a GaN marketing line into those cells. Ordinary outbound time remains 7–15 days. Same-day is not the standing policy.

Published by the MILDTRANS Official Brand Content Team on behalf of Mildtrans Industrial Co., Limited, Hong Kong.