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Types and selection principles of harness terminals
Time:2021-09-29 Read: 1424

The harness terminal is a conductive element that can form a circuit with the corresponding conductive element. Terminals include pins and sockets, which play the role of electrical connection. The materials used are good conductors such as copper and its alloys. The surface is treated with silver plating, gold plating or tin plating to improve corrosion resistance, oxidation resistance and rust resistance.


1. Terminal type

Terminals can be divided into sheet series, cylindrical series and wire connector series according to shape.

1) The chip series terminals are made of H65Y or H70Y materials with a thickness of 0.3~0.5.

2) Cylindrical series terminals are made of H65Y or Qsn6.5-0.1, and the material thickness is 0.3-0.4.

3) Wire connector series terminals are divided into three types: U type, fork type and hole type.

A. U-shaped terminals are made of H62Y2, H65Y, H68Y or Qsn6.5-0.1, and the material thickness is 0.4~0.6;

B. The fork-shaped terminal is also called Y-type terminal. The Y-type terminal is made of H62Y2 material with a thickness of 0.4~0.6, and part of the surface is nickel plated, with good conductivity;

C. The base material of hole-type terminal is generally H65Y and H65Y2, and the material thickness is 0.5~1.0.


2. Terminal selection principle

Terminals with different coating shall be selected according to different connectors and different requirements. For equipment requiring high performance, such as terminals for airbag, ABS, ECU, etc., gold-plated parts shall be preferred. In order to ensure safety and reliability, but for cost consideration, local gold-plated treatment can be selected on the premise of meeting performance requirements.

The specific selection principles are:

(1) Ensure a reasonable match between the terminal and the selected connector.

(2) Select the appropriate terminal according to the wire diameter of crimped wire.

(3) For single-hole waterproof connector, select the terminal whose tail can be crimped with waterproof bolts.

(4) Ensure the reliability of the connection. When selecting terminals, ensure good contact with electrical parts and plug-ins to minimize contact resistance and improve reliability. For example, surface contact is better than point contact, and pinhole type is better than leaf spring type. In the design, the connector with double-spring compression structure (low contact resistance) should be preferred.

(5) Impedance matching. Some signals have impedance matching requirements, especially RF signals, which are more stringent. When the impedance does not match, it will cause signal reflection, thus affecting signal transmission. Therefore, when selecting terminals, be sure to select terminals with impedance matching.


The corresponding relationship between the current and the applicable wire diameter that the Japanese terminal can carry is summarized. The waterproof terminal can carry the current and the applicable wire diameter, and the non-waterproof terminal can carry the current and the applicable wire diameter.

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