Tonetron Cable & Adapter Factory

2026-09-30

TTByTonetron Engineering Team · Dongguan Taitron Electronic Limited

Tonetron USB-C Cables with Hynetek and ConvenientPower eMarkers: iPhone 18 Pro AVS Fast Charging, and Up to 240W for Laptops

Tonetron USB-C cables use Hynetek HUSB332G / HUSB332E-CX and ConvenientPower CPS8826 eMarker chips, all compliant with USB PD 3.2. Like any compliant USB-C cable, they carry iPhone 18 Pro / Pro Max AVS fast charging in full; cables with the Hynetek eMarkers can also identify as EPR cables of up to 240W for laptops. For AVS fast charging, the charger is what matters.

A smartphone lying on a wooden table, connected to a charging cable (illustrative stock photo, not a Tonetron product)
Illustrative photo: a smartphone charging over a cable (not a Tonetron product)

Tonetron USB-C cables use eMarker chips from Hynetek (HUSB332G, HUSB332E-CX) and ConvenientPower (CPS8826). All three chips are compliant with USB Power Delivery 3.2. Our cables carry the AVS (Adjustable Voltage Supply) fast charging of iPhone 18 Pro and iPhone 18 Pro Max in full. Cables with the two Hynetek eMarkers can also identify themselves as EPR (Extended Power Range) cables of up to 240W, so the same cable can also charge laptops and other high-power devices.

Important: the charger decides AVS fast charging. For iPhone 18 Pro / Pro Max, Apple’s Fast charge your iPhone page says to use the USB-C cable that came in the box together with a 60W-capable (or greater) adapter that uses AVS and supports USB PD 3.2. Any compliant USB-C cable carries 3A at up to 20V (60W), so the cable is not the bottleneck. The cable carries the current safely and, where it has an eMarker, reports its own capability; the charging voltage is negotiated between the charger and the phone. A charger that offers only fixed-voltage PD will charge at an ordinary PD level, even if its rated power is higher.

Illustration: AVS fast charging for iPhone 18 Pro / Pro Max is decided by the charger; Tonetron USB-C cables use Hynetek HUSB332G / HUSB332E-CX eMarkers (up to 240W EPR) and the ConvenientPower CPS8826 eMarker (USB4 / Thunderbolt 4), all USB PD 3.2
What decides AVS fast charging, and where eMarker and 240W come in (illustration; details in the text)

What iPhone 18 Pro and iPhone 18 Pro Max need

Apple’s support page says: “To fast charge iPhone 18 Pro and iPhone 18 Pro Max up to 50 percent battery in around 15 minutes, use the USB-C cable that came in the box, and one of these adapters: Apple 40W Dynamic Power Adapter with 60W Max” or “a comparable third-party 60W-capable (or greater) adapter that uses Adjustable Voltage Supply (AVS) and supports USB Power Delivery (USB-PD) 3.2”. The iPhone 18 Pro technical specifications page describes the same condition as a “60W-capable USB‑C cable and USB PD 3.1 (or better) power adapters with Adjustable Voltage Supply (AVS)”.

So the charger is what matters. Every USB-C cable must support at least 3A at up to 20V (60W), which already meets Apple’s cable condition; the cable in the box is enough.

What independent tests measured

The figures in this section come from media tests, not from Apple. ChargerLAB (chongdiantou.com) reported that with the Apple 40W Dynamic Power Adapter, iPhone 18 Pro Max negotiated 18V and triggered the SPR AVS protocol, holding a peak of 52.9W for the first nine minutes. SPR AVS is the AVS mode of the standard power range; it lets a charger adjust its output in fine steps within 9–20V. In a separate iPhone 18 Pro test, Apple’s 140W adapter, whose AVS is the EPR kind, triggered only the 15V PD level and did not negotiate SPR AVS. The same review notes that a 3A cable is all that is needed.

Where the eMarker and 240W come in

An eMarker is a small chip inside the USB-C plug. When a charger asks, it reports what the cable can carry: its voltage and current rating and its data capability. Cables rated above 3A, including all 240W EPR cables, must carry an eMarker so the charger knows it may deliver more. According to the chip makers’ product pages and datasheets:

  • HUSB332G (Hynetek) is a “USB Type-C eMarker for Cable ID applications” that is “compliant to USB Power Delivery 3.2”, intended for a “Fixed Extended Power Range Cable: PD 3.2 240 W and USB2 data Communication”.
  • HUSB332E-CX (Hynetek) is an eMarker compliant with USB Type-C 2.4, USB PD 3.2 and the USB4® specification, for passive cables supporting data rates up to 80Gbps. Its ordering options are listed as “PD3.2, EPR”; under the USB PD specification, EPR cables are the 240W class (48V/5A).
  • CPS8826 (ConvenientPower) is an eMarker for passive full-feature USB Type-C cables, compliant with USB PD 3.2 and compatible with USB4 and Thunderbolt 4. It is not part of the 240W EPR category: its official specifications list no EPR capability.

None of the three chip makers’ materials mentions AVS, and they do not need to: AVS is offered by the charger and requested by the phone. For iPhone 18 Pro AVS fast charging, a Tonetron cable does what any compliant USB-C cable does. What the Hynetek eMarkers add is the 240W EPR rating, for laptops, docks and other high-power devices, so one cable can cover both.

Tonetron braided USB-C to USB-C cable with aluminium connector shells (product illustration)
Tonetron USB-C cable (product illustration)

Sources

iPhone is a trademark of Apple Inc., registered in the U.S. and other countries. USB4® is a registered trademark of USB Implementers Forum. The product photo is an illustration of a Tonetron USB-C cable.

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