What is Isolation?

In Ethernet devices, isolation requirements are primarily achieved by using transformers in the magnetics module (commonly integrated into RJ45 Jacks, as on some Brainboxes SW products).  These transformers provide galvanic isolation between the Ethernet cable (connected to the network) and the device’s internal circuits. This isolation ensures that high voltage spikes, interference, or power surges from the Ethernet cable do not damage the internal electronics or pose safety hazards to users.

According to the IEEE 802.3 Ethernet standard, Ethernet ports must be able to withstand 1,500VAC at 50 Hz to 60 Hz for 1 minute between the Ethernet ports and the case/chassis ground. This is critical for protecting against electrical faults while ensuring signal integrity.

What are IDC connectors?

Insulation Displacement Connectors (IDC) are a small and reliable connector, often used in tight spaces where durability and strong connections are important. These connectors come in different types, like board-to-board, wire-to-board, and wire-to-wire, making them versatile for various industries such as automotive, industrial, and consumer electronics.

Designed to reduce wear and maintain stability even in environments with vibration, they are often made with durable materials and coated with tin or gold to prevent corrosion. They are widely used in cars, industrial machines, and electronic devices like phones and computers, these connectors ensure consistent performance whilst also saving space in compact systems.

We use board to board connectors for the PE-405/415 and board to wire for the PE-505/515.

The part numbers for the IDC connectors that we use are as follows:

Number of Ways	Type	Manufacturer	Part Number
4-way	SMD	Wurth TE	690 357 280 476
			338728-4
	THT	Wurth TE	690 357 100 472
			215464-4
	Board to Wire	Wurth	690 157 000 472
		TE	215083-4
			338095-4
8-way	SMD	Wurth	690 357 280 876
		TE	338728-8
	THT	Wurth	690 357 100 872
		TE	215464-8
	Board to Wire	Wurth	690 157 000 872
		TE	215083-8
			338095-8

Do IDC connectors have isolation?

No, IDC connectors do not provide any electrical isolation. IDC connectors are primarily designed for reliable, compact connections. They are favoured due to not needing to strip or prepare cables when making connections between devices. Unlike Ethernet magnetics, which provide galvanic isolation through transformers, IDC connectors are simple connections that do not offer any built-in electrical isolation.

Do I require magnetics/isolation when interfacing with the PE range?

When maintaining proper earth, our PE-505/515 features on board isolation rated at 1500KV, meaning when interfacing with other off the shelf devices, you likely will not need to worry about external isolation/magnetics, however depending on your use case this can be subject to change. If you are unsure on whether you require isolation/magnetics in your system, please get into contact with our support team ([email protected]) for further guidance.