E mark cable Type C male to Type C male

There are 80% laptops and desktop computers adopting type-c port, and there are 50% smartphones and tablets also using type-c interface. 

As USB Type-C has the highest data transmission speed of 10Gbps, and its maximum power transmission speed can reach 100W, therefore this interface is widely used by more and more devices. 

With the rapid popularity of USB PD fast charging on mobile devices such as laptops and mobile phones, we have found that many USB PD chargers that support high current output are equipped with one USB-C with E-Marker to USB-C cable. The E-Marker is a chip which inside the USB-C to C cable, it record the cable's speed and highest current.

E-Mark is short for Electronically Marked and is actually a protocol controller. This will include the power supply, power receiving, and power transmitting capabilities of the product (cable, source, and sink), and the corresponding protocol and transmission requirements, which generally require PD (power-delivery) or PPS (Programmable Power Supply) devices.

Data transmission speed reaches USB 3.1 Gen1 (5Gbps) or USB 3.1 Gen2 (10Gbps)

Video: 5K

PD: 100W(20V/5A)

Compatibility: USB-C, DP, PCI

With USB-C PD (Power Delivery) protocol, the maximum charging power is specified as 100W, which starts from 5V/ 3A, then 9V/3A, 12V/3A, 15V/3A, and up to 20V/5A. According to the standard of the USB-IF Association, if the electric current of the cable used to charge your mobile device is equal to or less than a 3A wire, then using a 3A wire will be fine; cables with a transmission current at or below 3A are not required to have E-Marker chip inside. The E-Marker is the safe-protection mechanism and if the power adapter’s electric current output is greater than 3A, a 5A wire with an E-Mark chip will be required. Currently, many USB-PD charging cables sold individually in the market do not reach more than 60W, so the standard parameter is to not equip the E-marker chip in order to save costs which can cause issues for devices that require the chip. 

For example, the charging power of the Apple MacBook Pro 16’’ is 96W, which is 20.5V-4.7A. If a 3A wire with E-Marker is inserted, the charger will only output the maximum electric current of 20V / 3A because it does not recognize the E-Marker chip protocol. If there is no chip or protocol implemented in the cable when using Apple’s 96W charger with a maximum of 60W, the charger may output 96W (20V / 4.35A). It is possible for bugs to appear in the PD communication protocol, and the wire itself will only have a 3A load capacity or will output the 96W unsafely to your 16” MacBook Pro which can cause the wires to burn out or even terminate the equipment. The same traits can be applied to the Samsung Note 10+ or S20 Ultra which supports 45W fast charging. With these devices, the maximum electrical current is 4A, therefore it also requires a 5A cable with E-Mark.