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E-marking On Type-C Cable Thunderbolt™ 3 Cable

- Feb 17, 2017 -

E-marking on Type-C Cable Thunderbolt™ 3 Cable USB C TO USB C

Question:Under what conditions is an E-marker IC required in a Type-C to Type-C cable? When is an E-marker IC required at both ends of a Type-C to Type-C cable?


E-marking (having a Type-C controller) for the Type-C to Type-C cable is required under the following conditions:

  • If the Type-C cable is required to support more than 3A  current

  • If the Type-C cable is a full featured cable i.e, if the cable either supports either USB 3.1 Gen1 or USB 3.1 Gen2 signaling

For Type-C passive cable assembly, having E-marker IC at one end of the cable would be enough. Having an E-marker IC at both ends of the cable would be required for Type-C active cable designs wherein additional electronics such as re-drivers is required to recondition the USB high-speed data signals. In active cable designs, each end of the cable can have different active function. A DFP will query the cable to know the features supported at each end of cable.


Thunderbolt, famed for superfast speeds, high definition capability, and huge power output, has had an upgrade. Transferring data between Thunderbolt 3 devices at up to a staggering 20Gbps, this cable is ideal for large volume data and Ultra HD displays. It also supports power delivery up to 60 Watts, and can daisy chain up to six Thunderbolt 3 devices. Get the most from all your Thunderbolt 3 peripherals with the ultimate smart, high-speed cable.

Made for: USB-C/Thunderbolt 3 devices, 5K/Ultra HD

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