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roWaves Technologies

Certified Company ISO 9001-2008

Wurth Eelektronik-742700790 toroid (7W380)

Colour code: grey/black
Manufacturer code: 742700790
Ordering code: FT-21
Manufacturer part no.: WE-742700790
Material no.: 7W380
Permeability (μi): 380
Frequency range: 1 – 20MHz (wideband Bal:Un, depends on the application)
RF max. power: 500-800W
Curie temp.: 186°C typ.
Ext. diameter: 26mm
Int. diameter: 13mm
Length: 28.5mm
Price :

 10,98

1 in stock

Usable frequency ranges, depending on the application:

broadband transformers: 1 – 30 MHz

RFI / EMI / CMC suppression: 1 – 20 MHz


An impedance> 1000Ω (for operating frequency) is sufficient for most applications. The coils should be made with very good quality RG-316 coaxial cable. Any high quality RG-316 coaxial cable can allow 500W-1kW power in 160 /80/40m bands. For higher bands> 10MHz, it is recommended to use the additional Teflon insulated coaxial cable to keep the losses low.

According to the table below, for Wurth Elektronik 742700790 (our case), between 5 – 8 turns would be enough to obtain an impedance of at least 1000-2500Ω, from 1.8 – 14MHz .

Additional information

Weight 60 g
Dimensions 3 × 1.6 × 1.6 cm

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