How to Choose Between 2-Pin and 4-Pin Magnetic Connectors?

The key is to count how many circuits the device needs. For power only, 2 pins are enough. If you need in-place detection (whether the accessory is attached), accessory identification (reading a resistor or chip), or power and signal at the same time, you need 4 pins or more.

Note that pin count only means the number of contacts, not automatically the function: what each pin does must follow the pin map in the project drawing and the whole-device test results. Smart watches commonly use 4 pins: positive and negative power, plus temperature or identification, plus in-place detection. If you are unsure, send us the function list and our engineers will recommend the contact count and arrangement based on the circuit.

For a project-specific evaluation, please contact Mr. Wan at 133-2018-8513.