Hardware design
Deutschmann Automation GmbH & Co. KG
22
Instruction manual UNIGATE
®
IC - Powerlink V. 2.3
21.4.15
3.8
Requirement for Ethernet-Interface
There is an extremly large number of suppliers for RJ45 connectors (with and without integrated
Ethernet transformer), or single Ethernet transformers on the market, therefor it is not possible
for us to test all possibilities. If you consider that there are various qualities (SMD / THT, with /
without LED, vertical / horizontal, with / without EMC springs tab at the top / bottom, single / mul-
tiple times, etc.) with RJ45 connectors alone, it is probably understandable.
In General, RJ45 connectors and the external or built-in Ethernet transformer must meet the fol-
lowing properties:
Required parameters for Ethernet Transformer:
Turns ratio 1 CT: 1 CT ± 5%
Open Circuit Inductance 350 uH (min) @ 10 mV, 10 kHz
Insertion Loss 1.1 dB (max)
1500 Vrms dielectric, 1 minute
Required parameters for RJ45 connector:
CAT5, shielded if possible
To enable a quick start in the selection of appropriate components, we have compiled a list of
order numbers of Würth Elektronik below, where we source our components. Of course, other
manufacturers are possible, so the following list is to be considered exemplary.
Ethernet transformer 10/100 Base-T 1:1
We mainly use: Order-No. 749 010 014
We mainly use: Order-No. 615 008 140 121
RJ45 jack (single or multiple) with integrated transformer
To be cost-effective and more flexible we don‘t use RJ45 connectors with integrated transform-
ers. Technically, however, nothing speaks against it.
We exemplary tested: Order-No. 749 905 100 1
For more information:
We had bad experiences with SMT connectors in the past, because in the field they got demol-
ished every now and then due to mechanical loads.
