4 pole 3.5 mm diameter mini plug used in smartphones, etc. Since there is no standard for assigning functions to each of the 4-pole jacks, be sure to understand the specifications of each device before using them. The plastic part will come off when turned, so please remove it before soldering.
Package: PJ14
Plug/Jack: 3.5 mm plug
Stereo/Mono: -
Number of poles: 4 poles
Format: Straight
Terminal Treatment: -
Material: -
Compatible Jack: MJ-079, MJ-064H
Note: It is similar to the φ3.5 mm stereo plug.
4-pole type with 4 contacts.
About Insulation and Non-Insulation
Panel mounting type RCA pin jacks and φ3.5 jacks are divided into "insulated type" and "non-insulated type." Insulated or non-insulated refers to whether the GND terminal of the connector touches the panel when the connector is attached to the panel.
In the case of the insulation type, the GND terminal of the connector is not connected (contacted) with the panel.
The non-insulated type is electrically connected when the panel is metallic.
Insulated connectors are used when you do not want to create a "ground loop."
*What is a GND loop?
In particular, a loop of GND wire is called a "GND loop." When the magnetic flux chains with the loop, a current flows through the GND line, which generates a voltage and causes noise. In such a case, cutting the loop can prevent the noise caused by flux cross-linking.