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Types and selection principles of automotive wiring harness terminals

Types and selection principles of automotive wiring harness terminals

Blog | Nov 26,2022

A harness terminal is a conductive element that can form an electrical circuit with a corresponding conductive element. Terminals include two types of pins and sockets, which serve as electrical connections. The materials used are good conductors such as copper and its alloys. The surface is plated with silver, gold, or tin to improve corrosion resistance and oxidation resistance. and anti-rust.

Types and selection principles of automotive wiring harness terminals

Terminal type

Terminals can be divided into sheet-shaped series, cylindrical series, and wire joint series according to their shapes.

1)The chip series terminals are made of H65Y or H70Y material, and the material thickness is 0.3~0.5.

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

Terminal type

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

① The U-shaped terminal is made of H62Y2, H65Y, H68Y or Qsn6.5-0.1 material, and the material thickness is 0.4~0.6

② The fork-shaped terminal is also called the Y-shaped terminal. The Y-shaped terminal is made of H62Y2 material with a thickness of 0.4 to 0.6. Part of the surface is nickel-plated and has good electrical conductivity.

③ Hole terminals generally use H65Y and H65Y2 as the base material, and the material thickness is 0.5 to 1.0

2 The selection principle

Terminals need to select terminals with different plating layers according to different connectors and different requirements. For equipment that requires higher performance, such as terminals for airbags, ABS, ECU, etc., gold-plated parts should be preferred to ensure safety and reliability. However, due to cost considerations, partial gold-plated treatment can be selected on the premise of meeting performance requirements.

The specific selection principles are:

1)Ensure that the terminals are reasonably matched with the selected connectors.

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

3)For single-hole waterproof connectors, it is necessary to choose a terminal whose tail can be crimped with a waterproof plug.

4)Ensure the reliability of the connection. When selecting terminals, it is necessary to ensure good contact with electrical components and plug-ins, so as to minimize contact resistance and improve reliability. Such as surface contact is better than point contact, and pinhole type is better than leaf spring type. In the design, the connector with a double spring compression structure (very small contact resistance) should be preferred.

5)Impedance matching. Some signals have impedance matching requirements, especially radio frequency signals, which have stricter requirements on impedance matching. When the impedance does not match, it will cause signal reflection, thereby affecting signal transmission. Therefore, when selecting terminals, be sure to choose terminals with impedance matching.

The selection principle

The above is the analysis of the types and selection of automotive wiring harness terminals. Zhejiang Lianhe Electronics Co., Ltd. is a company specializing in the production of connectors, terminals, wiring harnesses, and other products. If you have any needs about connectors, please feel free to contact us.

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