Flux Concentrators / Shields

Laminated U-Shield

Magnetic Shielding for Planar Current Sensing Applications

High-Permeability Laminated U-Shields for Precision Current Sensing

Its laminated design is specifically optimized to minimize eddy current losses in high-frequency automotive and industrial power electronics.

High-Performance Laminated U-Shields

The Laminated U-Shield is a soft ferromagnetic shielding solution designed to enhance performance in planar current sensing systems, available in Nickel-Iron (Ni-Fe) and Silicon-Iron (Si-Fe) alloys known for their high linearity, low hysteresis, and excellent magnetic permeability. Used alongside magnetic field sensors such as Hall effect and AMR sensors, and integrated with busbar conductors, it effectively protects against parasitic magnetic fields while improving sensitivity and signal-to-offset ratio. Its laminated construction reduces eddy current losses, making it well-suited for high-speed, high-frequency applications across power electronics, automotive systems, and industrial automation.

Key Features

Available in Ni-Fe (48% Ni) and Si-Fe (<3.5% Si) laminated alloys

High relative permeability and low hysteresis

Improves signal-to-offset ratio of magnetic field sensors

Shields against external magnetic interference

Suitable for high-speed switching applications

Compact and easy-to-integrate geometry

Standard sizes available; custom designs on request

Technical Specifications

Magnetic Properties

Available Soft Magnetic alloys and their typical Magnetic, Chemical and Physical properties:

Magnetic Properties
Properties	Measurement	Unit	80% NiFe⁷	Mumetal⁷	48% NiFe⁸	Si Steel	Fe-49% Co-2%V
DC Magnetic Properties	Bs	Tesla	0.75¹	0.76¹	1.5³	1.73⁹	2.25(11)
	Br	Tesla	0.4²	0.5²	1.1³	-	1.3
	B at 100 A/m	Tesla	-	-	1.2	-	-
	Hc²	A/m	0.35	0.6	2.8	-	40 to 160(12)
	µ4⁴	-	550000	120000	-	-	-
	µ max	-	570000	350000	190000	-	18000
60Hz AC Magnetic Properties	µ4z⁵	-	70000	50000	10400	>2500	1200
	µz8⁶	-	-	-	54000	-	-
	µ max	-	95000	95000	-	-	12000
	Core loss	W/Kg	0.015	0.015	0.4	3.9¹⁰	2.3 to 3.0(13), 3.8 to 5(14)

Technical Specifications

Chemical Composition

Element	Unit	80% NiFe⁷	Mumetal⁷	48% NiFe⁸	Si Steel	Fe-49% Co-2%V
Ni	%	78-81	78-81	47-48	Nil	-
Mo	%	4.5-6	4.5-6	Nil	Nil	-
Si	%	0.05-0.4	0.05-0.4	0.1	1.6 - 2.1	-
Mn	%	0-0.5	0-0.5	0.5	0.5	-
C	%	0.01	0.01	0.005	0.01	-
Co	%	-	-	-	-	49
V	%	-	-	-	-	2
Fe	%	Balance	Balance	Balance	Balance	Balance

Technical Specifications

Physical Properties

Parameter	Unit	80% NiFe⁷	Mumetal⁷	48% NiFe⁸	Si Steel	Fe-49% Co-2%V
Density	g/cm³	8.7	8.7	8.2	7.75	8.12
Specific Heat	J/Kg.˚C	460	460	500	-	460
Thermal conductivity	W/m.˚C	19	19	13	-	33
Mean CTE between -50˚C & +200˚C	˚C⁻¹	12 x 10⁻⁶	12 x 10⁻⁶	8 x 10⁻⁶	-	9.7 x 10⁻⁶
Electrical resistivity	µΩ.cm	60	60	45	-	40
Curie Point	ᵒC	420	420	450	-	950
Coefficient of magnetostriction at Saturation ∆l / l	-	1-3 x 10⁻⁶	1-3 x 10⁻⁶	24 x 10⁻⁶	-	70 x 10⁻⁶
Melting temperature	ᵒC	1450	1450	1425	-	1480
Hardness(Cold Worked)	Hv	325	325	250	-	400
UTS(Cold Worked)	MPa	1050	1050	850	-	1200
0.2% PS(Cold Worked)	MPa	1030	1030	820	-	1150
Elongation(Cold Worked)	%	3	3	3	-	2
Hardness(Annealed)	Hv	160	160	140	155	220
UTS(Annealed)	MPa	650	650	500	380	480
0.2% PS(Annealed)	MPa	280	280	250	250	300
Elongation(Annealed)	%	35	35	40	min 30	4.5
Grain Size(Annealed)	-	8	8	9	-	-
Hardness(Finished Part)	Hv	110	110	100	-	-
UTS(Finished Part)	MPa	530	530	450	-	-
0.2% PS(Finished Part)	MPa	160	160	200	-	-
Elongation(Finished Part)	%	45	45	35	-	-
Grain Size(Finished Part)	-	0-3	0-3	0	-	-

Material Specification

Material Specification	Lamination Thickness	Ni or Si content
Lamination Thickness and Nickel content	0.5mm	48% (Ni)
Lamination Thickness and Silicon content	0.5mm	<3.5% (Si)

Available Standard Geometries*

(All dimensions are in mm)

Order code	W	L	H	T
LU15-8-15-3-SiFe	15	8	15	3
LU15-8-15-3-NiFe	15	8	15	3
LU15-13-15-3-SiFe	15	13	15	3
LU15-13-15-3-NiFe	15	13	15	3
LU20-8-15-3-SiFe	20	8	15	3
LU20-8-15-3-NiFe	20	8	15	3
LU20-13-15-3-SiFe	20	13	15	3
LU20-13-15-3-NiFe	20	13	15	3
LU25-8-18-3-SiFe	25	8	18	3
LU25-8-18-3-NiFe	25	8	18	3
LU25-13-18-3-SiFe	25	13	18	3
LU25-13-18-3-NiFe	25	13	18	3

Trust Reliability & Quality

With over 60 years of manufacturing excellence, PML delivers Laminated U shield trusted by OEMs and Tier 1 suppliers across sectors demanding robust performance.