Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Styles 7718 7725 7738 9925 9938
Power rating P70 W45779
Resistance range Ω0R003 ... 0R004 ... 0R005 ... 0R004 ... 0R005 ...
0R051 0R068 0R1 0R068 0R1
E-Series E24>0R01 E24>0R01 E24>0R01 E24>0R01 E24>0R01
Tolerances % ± 1, ± 2 ,± 3, ± 5
Temperature coefficient 10-6 * K-1 + 200 ... + 1200
depends on value
max. cont. work. voltage VRMS √ P70 · R for all styles
Insulation voltage (1min.) VRMS 2000
Insulation resistance Ω> 104M
Derating oC linear 70 ... 250 (0W)
Climatic category 55/200/56
Temperature range oC - 55 ... 250
Thermal resistance KW-1 65 50 38 35 30
Failure rate
(Tot al, ϑo, max., 60% conf. lev.) 10-9 * h-1 appr. 10, depends on value
Endurance
(P70, @70oC, 1000h interm.) % ± 3,0 average
Damp heat, steady state
(40oC, 93% r.h., 56d) % ± 0,5
Climatic sequence % ± 0 ,5
Terminal strength % ± 0, 5
Terminal tensile strength N min. 25
Resistance to soldering heat
(260oC, 10s) % ± 0,2 typ.
Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20-T
Marking printed in clear
Series KN
Low Ohmic Power Resistors, low inductance, ceramic case
Specifications
KN350-8 KN351-8 KN352-8 KN353-8 KN354-8
Type
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Series KN
Dimensions in mm:
Ordering example: KN350-8 5 B 0R015
Type Tolerance Pack.-Code R-Value
KN350-8 KN351-8 KN352-8 KN353-8 KN354-8
L118 25 38 25 38
L240 45 60 45 60
Measuring length L2: Resistance value is measured over the centered length L2 on
terminals free of oxide and contaminations. Differing conditions
require adequate corrections (Rterminal = 0,4 mΩ/cm)
Packaging: Type Packaging Pieces Pack.Code
KN350-8 bulk 200 B
taped 1000 R
KN351-8 bulk 200 B
KN352-8 bulk 200 B
KN353-8 bulk 200 B
KN354-8 bulk 100 B
350...352 353...354
Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Styles 3313 3321 3332
Power rating P70 W123
Resistance range Ω0R003...0R051 0R004...0R068 0R005...0R1
E-Series E 24 > 0R01
Tolerances % ± 1, ± 2 ,± 3, ± 5
Temperature coefficient 10-6 * K-1 + 200 ... + 1200
depends on value
max. cont. work. voltage VRMS √ P70 · R for all styles
Insulation voltage (1min.) VRMS non insulated
Insulation resistance Ωnon insulated
Derating oC linear 70 ... 300 (0W)
Climatic category 55/200/56
Temperature range oC - 55 ... 300
Thermal resistance KW-1 200 100 70
Failure rate
(Tot al, ϑo, max., 60% conf. lev.) 10-9 * h-1 appr. 10, depends on value
Endurance
(P70, @70oC, 1000h interm.) % ± 3,0
Damp heat, steady state
(40oC, 93% r.h., 56d) % ± 0,5
Climatic sequence % ± 0 ,5
Terminal strength % ± 0, 5
Terminal tensile strength N min. 25
Resistance to soldering heat
(260oC, 10s) % ± 0,2 typ.
Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20-T
Marking value imprinted
Series KN
Low Ohmic Power Resistors, low inductance, axial
Specifications
KN350-0 KN351-0 KN352-0
Type
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Dimensions in mm:
Ordering example: KN351-0 3 B 0R033
Type Tolerance Pack.-Code R-Value
Type L1L2 ±1
KN350-0 12 ...14,5 40
KN351-0 17,5 ...21,5 45
KN352-0 29 ... 34 60
Measuring length L2: Resistance value is measured over the centered length L2 on
terminals free of oxide and contaminations. Differing conditions
require adequate corrections (Rterminal = 0,4 mΩ/cm)
Packaging: Type Packaging Pieces Pack.Code
KN350-0 bulk 500 B
KK351-0 bulk 500 B
KN352-0 bulk 500 B
38
±1
L
1
38
±1
L
2
±1
±0,02
Series KN
Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Power rating P70 W 0,5 1,0 1,5
Resistance range Ω0R003...0R051 0R003...0R082 0R005...0R1
E-Series E 24 > 0R01
Tolerances % ± 1, ± 2 ,± 3, ± 5
Temperature coefficient 10-6 * K-1 + 200 ... + 1200
max. cont. work. voltage VRMS √ P70 · R for all styles
Insulation voltage (1min.) VRMS non insulated
Insulation resistance Ωnon insulated
Derating, linear oC 70 ... 300 (0W)
Climatic category 55/200/56
Temperature range oC - 55 ... 300
Thermal resistance KW-1 200 100 70
Failure rate
(Tot al, ϑo, max., 60% conf. lev.) 10-9 * h-1 ca. 10, depends on value
Endurance
(P70, 70oC, 1000h interm.) % ± 3,0
Damp heat, steady state
(40oC, 93% r.h., 56d) % ± 0,5
Climatic sequence % ± 0 ,5
Terminal strength % ± 0, 5
Terminal tensile strength N min. 25
Resistance to soldering heat
(260oC, 10s) % ± 0,2 typ.
Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20-T
Marking value imprinted
Series KN
Low Ohmic Power Resistors, low inductance, radial
Specifications
KN350-009 KN351-009 KN352-009
KN351-010 KN352-010
KN352-011
Type
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
[∆R]
R
Revision 200807
VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL
Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com - www.vitrohm.com
Series KN
Dimensions in mm:
Type RM Hmax.
KN350-009 10 6,5
KN351-009 10,5
KN352-009 17,0
KN351-010 15 8
KN352-010 14,5
KN352-011 20 12
Construction: The resistive elements consist of a flat metal-band. Spot welded Cu-terminals
ensure high stability of contacts. Thus, this construction results in a
non inductive resistor of both high stability and overload capacity.
Packaging: Type Packaging Pieces Pack.Code
KN350-009 bulk 1000 B
KK351-009 bulk 1000 B
KN351-010
KN352-009 bulk 500 B
KN352-010
KN352-011
Ordering example: KN350-009 5 B 0R015
Type Tolerance Pack.-Code R-Value
3,5
+1
Measuring point
M
10
Series KN
Diagram: Temperature coefficient of metal-band resistors
series KN (350-354)
Pulse capability of resistors:
General information on pulse capability very often need
additional explanations and do not always comply with a
given application.
Please contact factory or sales office for your special
requirements. For dealing with your application we need
the following information:
Pulse shape and repetition rate
max. peak power
Pulseduration or time constant
max. peak voltage
Resistance value
If already selected:
Type or series or technology
or preferred style
TK
[x10-
6
K-
1
]
+25
-25
[m Ω]
+200
+100
+600
+500
+400
+300
10090807020 10 60504030
24
Design Notes for Current Sense Resistors
General:
VITROHM offers a range of low-ohm resistors for
current sensing applications, resistance ranges
typically from 1 milliohm to 100 milliohms.
These devices are of non-wound construction and
made from flat resistive alloy wire.
The resistor‘s specification depends on the material
and the choosen dimensions, namely specific-resi-
stance, thermal conductivity and temperature
coefficient are of importance.
1. Standard, leaded types, KN-family
Types KN 350 ... KN 354
The „KN-resistors“ are available in standardized sizes
with choices of open-frame and ceramic cased types.
Copper leads are welded to the resistive element for
board assembly .
Attention should be given to the following:
- resistance value
The value is specified over a given „measuring
length“. Between the two measuring points lies the
element plus some copper-wire for contact
purposes.
If the actual used total length of the resistor in the
application differs from this specified length, the
influence of the copper wire of 0.4 mΩ per
centimeter must be considered.
- temperature coefficient
Typically the temperature coefficient of the resistive
element ranges around 150 ppm/oC (ask factory
for details). However , the copper wire is part of the
effective resistance and influences the TC between
the contacts.
The lower the resistance value, the more influence
of the copper leads, the higher the TC!
If the TC is of concern in a given application, a
vertical style of the KN-family should be used (type
35X-009). In this case the influence of the copper
wire is almost eliminated.
- power and current rating
The „KN-resistors“ are standard products with a
fixed given power rating (P70). Nevertheless, current
rating can be of concern, especially if overload or
pulse conditions can occure.
The current limit is defined by the current density ,
and 100 A per mm2 are considered absolute
maximum in power electronics. With a 0,8 mm
diameter copper wire, the current limit is 50 A.
With respect to reliability, the welding junction
between copper and resistive alloy should not carry
more than 20 A continuously .
The 50 A limit may not be exceeded even under
pulse conditions.
2. Semi-customized types, LPS-family
Types LPS 355 ... LPS 359
VITROHM provides tools to produce U-shaped low-
ohm resistors for direct board mounting.
The solder-tags (1 or 2 per side) are of given
dimensions, the size of the final unit is designed in
accordance with the applicational requirements.
If the demand for a shunt-resistor justifies a
customized solution, the LPS-family offers a variety
of possibilities.
Marking
3,5
+1
Measuring point
M
Series KN V I T R O H M
Low Ohmic Power Resistors, low inductance, radial
Specifications
Type KN353-009
KN353-010
KN353-011
Nominal Power rating P70 W 3
Resistance range
E-series
Tolerance
Ω 0R005,0R01,0R015,0R02,0R022,0R03,0R033
0R039,0R047,0R051,0R06,0R068,0R082,0R1
%
(other values under request)
E24 >0R01
±1 , ±2 , ±3 , ±5
Temperature coefficient 10-6 * K-1 + 200 … + 1200
Depends on value
Max. cont. working voltage VRMS
for all styles
Insulation voltage (1min.) VRMS
non insulated
Insulation resistance Ω
non insulated
Derating linear °C
70 … 300 (0W)
Climatic category
55/200/56
Temperature range °C
-55…300
Thermal resistance KW-1 60
Failure Rate (Total max, 60% conf. lev.) 10-9 * h-1
Appr. 10, depends on value
Endurance (P70, @70°C, 1000h, interm.) [ΔR/R] %
± 3,0
Damp heat, steady state (40°C, 93% r.h., 56d) [ΔR/R] %
± 0,5
Climatic sequence [ΔR/R] %
± 0,5
Terminal strength [ΔR/R] % ± 0,5
Terminal tensile strength N
min. 25
Resistance to soldering heat (260°C, 10s) [ΔR/R] %
0,2% typ.
Solderability S 2,5 Flowtime, solderglobule test, IEC 60068-2-20-T
Marking Value imprinted
Revision 201106
VITROHM PORTUGUESA, Lda. – Est. Nacional 249-4, Trajouce – 2765-653 S. Domingos de Rana – PORTUGAL
Tel:+ 351 214 457 700 - Fax:351 214 457 755 – Germany Sales Tel:+ 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com – www.vitrohm.com
Series KN V I T R O H M
Dimensions in mm:
Marking
RM
Cone 0º - 10º
H
max.
3,5
+1
3
0,8
Ø
MMM
measuring point
M
L
max.
Construction: The resistive elements consist of a flat metal-band. Spot welded Cu-terminals
ensure high stability of contacts. Thus, this construction results in a
non inductive resistor of both high stability and overload capacity.
Packaging:
Ordering example: KN353-010 5 B 0R015
Type Tolerance Pack.-Code R- value
Revision 201106
VITROHM PORTUGUESA, Lda. – Est. Nacional 249-4, Trajouce – 2765-653 S. Domingos de Rana – PORTUGAL
Tel:+ 351 214 457 700 - Fax:351 214 457 755 – Germany Sales Tel:+ 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com – www.vitrohm.com
Type RM H max. L max.
KN353-009 10 20 16
KN353-010 15 18 21
KN353-011 20 15 26
Type Packaging Pieces Pack.Code
KN353-009
KN353-010
KN353-011
Bullk
500
B
