If you own a 100W, 140W or 240W PD fast charger but fail to get full charging speed, the problem may lie in your USB-C cable, not the power adapter. The missing key component is an E‑Marker chip.
The E‑Marker (Electronic Marker) is a miniature smart IC embedded inside premium USB‑C cables. It communicates between your charger and device to report the cable’s maximum safe power rating. Without this chip, the charging system restricts output to only 60W. No matter how powerful your charger is, full-speed fast charging will never activate.
Low-cost cables often skip the E‑Marker chip to cut costs. Pushing high current through these unrated cables causes excess heat, accelerating cable wear and bringing potential risks to your smartphones and laptops.
SUNGUY USB C Cable is equipped with certified E‑Marker chips. The chip accurately negotiates power delivery up to 240W PD 3.1 EPR, unlocking maximum charging performance for laptops, flagship phones and power banks. Meanwhile, it maintains stable data and video signal transmission without throttling.
Consistent with our brand pursuit of Efficient, Safe, and Seamless digital connectivity, the built-in E‑Marker makes the SUNGUY USB C Cable a dependable choice for high-power daily use.
When selecting a fast charging cable, do not judge merely by appearance. Always pick cables with genuine E‑Marker chips to enjoy safe, full-speed charging. Choose the SUNGUY USB C Cable for reliable high-power performance.
