The same brand of two USB Data Cable look the same look, the price is not the same, many people do not know why, in fact, experts know, in addition to USB data cable plug material is different, the more important factor is that it inside wire specifications Models are not the same, resulting in two USB data cable function is different, take charging, the two USB data cable charging speed is not the same, a fast, a slow, of course, the price of the fast charge must be expensive a little.
USB Data Cable are generally able to look in appearance, such as AWM 2725, E159272 such words, which is the line to follow the design specification information. UL and CSA specifications focus on the wire can withstand temperature, voltage, and wire type and the appropriate use, covering a wide range of fields. Mobile device transmission power conditions, compared to home, business environment, industrial use, the voltage and current is low as a pediatrician. In the normal use of the situation, it is not too concerned about this difference, only need to know its literal meaning can be.
If you want to buy the charge of the USB data cable, then you only need to pay attention to AWG specifications, wire structure related clues, the same can be found in the appearance of the body, the print is generally 28AWG / 2C + 26AWG / 2C or 28AWG / 1P, 26AWG / 2C, and so on. AWG is representative of the American Wire Gauge American Wire Gauge, which is part of the wire composition of the design specifications, is also the most commonly used industry standard. The number is the wire number, used to indicate the diameter of the wire (in inches).
The smaller the AWG value represents the thicker the wire diameter, the more the wire with the smaller value, The emphasis is on cross-sectional area differences. USB cable each signal line, the internal is composed of many small soft copper wire, tinned soft copper wire and other types of wire composition, such as 20AWG is stuffed into 26 * 0.16 wire, and 28AWG only 7 * 0.12 root. In contrast, 20AWG each wire diameter is relatively thick, cross-sectional area naturally greater than 28AWG. And these small wires, and its diameter and can be carried directly proportional to the amount of current, that is, the more the higher the amount of bear.
For USB Data Cable in general applications, AWG small value can withstand the inevitable high current, the key lies in the cross-sectional area of this point. Of course, AWG is only industrial design specifications, and to the premise of security. As the quality of wire production and the use of ambient temperature, will have a great impact on the transmission characteristics, many of which are difficult to do one by one, so only the design specifications to find the reference point. The key idea is to buy eyes wide open, as much as possible to choose the appearance of the body is more thick, and AWG specifications of the higher wire.