Würth

Würth WE-FSFS Flexible Sintered Ferrite Sheet

Würth Elektronik eiSos Flexible Sintered Ferrite Sheet (WE-FSFS) is a product designed for high performance magnetic flux redirection.

  • Can help eliminate eddy currents near antennae increase the inductance and shift to lower frequencies
  • Can be used as noise absorbers
  • Special designs can be supplied on request
Product RangeView Data Sheet

Product Description

Würth Elektronik eiSos Flexible Sintered Ferrite Sheet (WE-FSFS) is a product designed for high performance magnetic flux redirection.

Magnetic Field Interferences are increasing in electronic devices due to a number of factors including reduced separation distances of PCB’s Integrated Circuits and many other sensitive components. In addition to this the extended use of magnetically coupled communication technologies (Qi-WPC NFC RFID PMA A4WP WCT…) leads to more complex layout and proximity considerations.

With Ferrite materials it is possible to manage and predict magnetic flux flow and thereby improve efficiency of power transfers increase distances of near field communications and of course avoid additional unwanted coupling effects which could lead to losses or noise.

The correct management of the magnetic flux improves the energy and data transfer in inductive coupled systems (NFC RFID Wireless Power etc.) achieving a higher efficiency and communication range.
Size and weight are critical parameters in today’s electronic devices. In the latest generation of ferrite compositions used in WE-FSFS optimal results are achieved with minimal thickness.

Thanks to its structure WE-FSFS despite its thickness is resistant enough to support manipulation during transport storage and assembly. The ferrite layer is cut by laser in 2 mm x 2 mm size squares protected on one side by the PET layer and on the other by the double-sided adhesive layer.
This structure provides enough flexibility to stand repeated bending without a decrease on the electromagnetic performance of the product.

Bending tests have been performed by Würth Elektronik eiSos in order to guarantee the electromagnetic properties of WE-FSFS. A 10 cm bending radius deformation is applied and maintained during 30 sec. The cycle is repeated 20 times. After the test the electromagnetic properties of the specimens are measured and proved to be inside the specifications.

Thanks to its high μ’ when WE-FSFS is attached to a planar coil there is an increase of the inductance without a Q decrease a similar effect to inserting a ferrite core into a traditional solenoid coil.
The combination of high performance and low thickness makes Würth Elektronik eiSos WE-FSFS flexible sintered ferrite sheets an indispensable partner for modern electronic devices.

PET protective layer

High surface resistivity and adhesive strength to protect the ferrite layer.

Pre-cut Sintered Ferrite Layer

This is the core of the product. Its magnetic properties concentrate and control the external magnetic fields.

Adhesive layer

High adhesive strength to protect the ferrite and to apply the product.

Product Range
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  Manufacturer Part No Order Code Manufacturer / Description
Availability Price For
 Price
 Quantity
 Shielding Type Gasket Material Product Length Product Width Product Depth Product Range
354001
354001 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.1 mm

2420801

Data Sheet
+
RoHS
Date/Lot Code

Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.1 mm

WURTH ELEKTRONIK

You previously purchased this product. View in Order History

40 in stock + Check Stock & Lead Times

40 in stock for next day delivery (UK stock)

More stock available week commencing 31/08/26

Each

1+ £25.78 £30.94 3+ £24.40 £29.28 5+ £23.78 £28.54 10+ £23.16 £27.79 20+ £22.82 £27.38 50+ £20.84 £25.01 More Pricing...

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EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.18mm WE-FSFS
354002
354002 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.2 mm

2420802

Data Sheet
+
RoHS
Date/Lot Code

Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.2 mm

WURTH ELEKTRONIK

You previously purchased this product. View in Order History

Available for back order

+ Check Stock & Lead Times

More stock available week commencing 31/08/26 Contact me when back in stock

Each

1+ £28.98 £34.78 3+ £27.43 £32.92 5+ £26.04 £31.25 10+ £24.78 £29.74 20+ £23.28 £27.94 50+ £21.78 £26.14 More Pricing...

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EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.28mm WE-FSFS
354003
354003 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.3 mm

2420803

Data Sheet
+
RoHS
Date/Lot Code

Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.3 mm

WURTH ELEKTRONIK

You previously purchased this product. View in Order History

92 in stock + Check Stock & Lead Times

92 in stock for next day delivery (UK stock)

More stock available week commencing 31/08/26

Each

1+ £32.85 £39.42 3+ £31.09 £37.31 5+ £29.51 £35.41 10+ £28.08 £33.70 20+ £26.05 £31.26 50+ £24.01 £28.81 More Pricing...

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EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.38mm WE-FSFS
354004
354004 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.1 mm

2420804

Data Sheet
+
RoHS
Date/Lot Code

Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.1 mm

WURTH ELEKTRONIK

You previously purchased this product. View in Order History

47 in stock + Check Stock & Lead Times

47 in stock for next day delivery (UK stock)

More stock available week commencing 31/08/26

Each

1+ £14.06 £16.87 3+ £13.00 £15.60 5+ £12.31 £14.77 10+ £12.08 £14.50 20+ £11.84 £14.21 50+ £11.11 £13.33 More Pricing...

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EMI Shielding Flexible Sintered Ferrite 60mm 60mm 0.18mm WE-FSFS
354006
354006 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.3 mm

2420807

Data Sheet
+
RoHS
Date/Lot Code

Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.3 mm

WURTH ELEKTRONIK

You previously purchased this product. View in Order History

Available for back order

+ Check Stock & Lead Times
  • 39 more will be available week commencing 10/04/26

    • More stock available week commencing 31/08/26 Contact me when back in stock

    Each

    1+ £18.39 £22.07 3+ £16.09 £19.31 5+ £15.68 £18.82 10+ £15.27 £18.32 20+ £14.75 £17.70 50+ £13.47 £16.16 More Pricing...

    Restricted Item

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    Min: 1 Mult: 1
    		EMI Shielding Flexible Sintered Ferrite 60mm 60mm 0.38mm WE-FSFS
    364001
    364001 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.1 mm

    2420808

    Data Sheet
    +
    RoHS
    Date/Lot Code

    Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.1 mm

    WURTH ELEKTRONIK

    You previously purchased this product. View in Order History

    35 in stock + Check Stock & Lead Times

    35 in stock for next day delivery (UK stock)

  • 40 more will be available week commencing 29/05/26

    • More stock available week commencing 31/08/26

    Each

    1+ £25.78 £30.94 3+ £24.40 £29.28 5+ £23.78 £28.54 10+ £23.16 £27.79 20+ £23.11 £27.73 50+ £21.11 £25.33 More Pricing...

    Restricted Item

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    Min: 1 Mult: 1
    		EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.18mm WE-FSFS
    364002
    364002 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.2 mm

    2420809

    Data Sheet
    +
    RoHS
    Date/Lot Code

    Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.2 mm

    WURTH ELEKTRONIK

    You previously purchased this product. View in Order History

    28 in stock + Check Stock & Lead Times

    28 in stock for next day delivery (UK stock)

  • 40 more will be available week commencing 12/08/26

    • More stock available week commencing 31/08/26

    Each

    1+ £29.49 £35.39 3+ £27.91 £33.49 5+ £26.49 £31.79 10+ £25.21 £30.25 20+ £24.04 £28.85 50+ £22.86 £27.43 More Pricing...

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    Min: 1 Mult: 1
    		EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.28mm WE-FSFS
    364003
    364003 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.3 mm

    2420810

    Data Sheet
    +
    RoHS
    Date/Lot Code

    Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 120 mm x 120 mm x 0.3 mm

    WURTH ELEKTRONIK

    You previously purchased this product. View in Order History

    20 in stock + Check Stock & Lead Times

    20 in stock for next day delivery (UK stock)

  • 75 more will be available week commencing 19/05/26

    • More stock available week commencing 31/08/26

    Each

    1+ £34.01 £40.81 3+ £32.19 £38.63 5+ £30.55 £36.66 10+ £29.07 £34.88 20+ £27.73 £33.28 50+ £26.38 £31.66 More Pricing...

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    		EMI Shielding Flexible Sintered Ferrite 120mm 120mm 0.38mm WE-FSFS
    364004
    364004 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.1 mm

    2420811

    Data Sheet
    +
    RoHS
    Date/Lot Code

    Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.1 mm

    WURTH ELEKTRONIK

    You previously purchased this product. View in Order History

    15 in stock + Check Stock & Lead Times

    15 in stock for next day delivery (UK stock)

    More stock available week commencing 31/08/26

    Each

    1+ £14.06 £16.87 3+ £13.00 £15.60 5+ £12.48 £14.98 10+ £12.31 £14.77 20+ £12.17 £14.60 50+ £11.11 £13.33 More Pricing...

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    Min: 1 Mult: 1
    		EMI Shielding Flexible Sintered Ferrite 60mm 60mm 0.18mm WE-FSFS
    364006
    364006 - Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.3 mm

    2420813

    Data Sheet
    +
    RoHS
    Date/Lot Code

    Sheet, EMI Shielding, Square, Flexible Sintered Ferrite, 60 mm x 60 mm x 0.3 mm

    WURTH ELEKTRONIK

    You previously purchased this product. View in Order History

    12 in stock + Check Stock & Lead Times

    12 in stock for next day delivery (UK stock)

    More stock available week commencing 31/08/26

    Each

    1+ £18.39 £22.07 3+ £16.09 £19.31 5+ £15.68 £18.82 10+ £15.27 £18.32 20+ £14.53 £17.44 50+ £13.25 £15.90 More Pricing...

    Restricted Item

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    Min: 1 Mult: 1
    		EMI Shielding Flexible Sintered Ferrite 60mm 60mm 0.38mm WE-FSFS