Vitreous Enamelled Wirewound Resistors
IRC Wire and Film Technologies Division
W20 Series
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Rugged all-welded construction
High purity ceramic substrate
Impervious lead-free vitreous enamel coating
High stability and high reliability
Suitable for harsh environments
Overload charcteristics ideal for protection circuits
Lead-free, RoHS-compliant construction
Specifications
Part
Number
W21
Power rating
@25°C
(Watts)
3.0
Resistance
Range
(Ohms)
1 - 10K
0.5 - 10K
0.1 - 10K
W215
5.0
1 - 15K
0.5 - 15K
0.1 - 15K
W22
7.0
1 - 22K
0.5 - 22K
0.1 - 22K
W23
10.0
1 - 60K
1 - 60K
0.15 - 60K
W24
14.0
1 - 100K
1 - 100K
0.15 - 100K
Notes
1
See temperature rise graph
Tolerance
(±%)
1
2
5
1
2
5
1
2
5
1
2
5
1
2
5
TCR
(±ppm/°C)
Typical: <+75
Maximum: +200
Limiting Element
Voltage
(Volts)
100
88
Thermal
Impedance
1
(°C/watt)
Typical: <+75
Maximum: +200
160
58
Typical: <+75
Maximum: +200
200
44
Typical: <+75
Maximum: +200
500
29
Typical: <+75
Maximum: +200
750
22
Application Notes
The terminations should not be bent closer than 1.6mm from the body of the resistor, and the recommended
bend radius is 1.2mm. Terminations are solderable to within 4mm from the resistor body.
When cold, vitreous enamel has excellent insulation resistance. In common with all insulation materials, the
specific resistance of the enamel decreases with increased temperatures. Therefore, resistors operated at
near-maximum temperature cannot be considered as insulated and should not be used in contact with any
conductive material.
Care must be taken when determining clearance distance between the resistor body and printed circuit board
or other components to ensure these are not overheated. Resistance is measured 6mm from the resistor body.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of printing.
A subsidiary of
TT electronics plc
W20 Series Issue November 2006
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
IRC Wire and Film Technologies Division
Environmental Performance
Test
Load at commercial rating: 1000 Hours at room temperature
Dry heat: 1000 hours at 200°C
Shelf life: 12 months at room temperature
Short term overload
Climatic
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise (in a decade of frequency)
Insulation resistance
Dielectric withstanding voltage
Operating temperature range
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µV/V
Ω
V
°C
Maximum
5
2
0.03
1.0
0.5
0.05
0.5
0.25
0.25
zero
>0.1GΩ
500 min.
-55 to +200
Typical
4
1
0.02
0.2
0.2
0.02
0.2
0.03
0.05
zero
>0.1GΩ
500 min.
Construction
A high purity ceramic substrate is assembled with
interference-fit end caps, to which are welded the
termination wires. The resistive element is wound
on the substrate and welded to the caps, and the
vitreous enamel protective coating is then applied.
Temperature Rise Curve
p
400
W21
W215
W22
W23
W24
300
Temperature Rise (ºC)
Terminations
Copper-clad steel wire, nickel-plated and
solder-coated.
200
100
Marking
The resistors are legend-marked with type
reference, resistance value and tolerance.
0
5
10
Dissipation (watts)
15
20
Solvent resistance
The body protection and marking are resistant to
all normal industrial cleaning solvents suitable for
printed circuits.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of printing.
A subsidiary of
TT electronics plc
W20 Series Issue November 2006
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
IRC Wire and Film Technologies Division
Dimensions
(mm)
Type
W21
W215
W22
W23
W24
L
(max.)
12.7
22.0
22.2
38.0
53.5
D
(max.)
5.6
7.0
8.0
8.0
8.0
f
(min)
22.75
23.1
23.1
30*
30*
ød
(nom.)
0.8
0.8
0.8
0.8
0.8
Weight
(g)
1.0
2.0
2.0
d dia
3.5
5.0
D
L
f
Notes
1
* W23 and W24 Series resistors are supplied loose-packed in boxes.
Ordering Information
Specify type, resistance, tolerance and packaging.
This example is for a W21, 9000Ω, 5%, taped and
ammo-packed.
All W20 Series resistors are RoHS-compliant.
Sample Part No.
IRC Style
W20
Resistance Value
(≥100 - First 3 significant digits
plus 4th digit multiplier)
Example:
100 = 1000;
1000 = 1001;
150K = 1503.
(>100 - "R" is used to designate decimal)
Example:
51 = 51R0,
1 = 1R00;
0.25 = R250
Tolerance
F = ±1%,
G = ±2%,
J = ±5%
Packaging
(A = ammo; R= reel; B = box)
W21
9001
J
A
Packaging
W21 and W215 resistors are taped and packaged in
ammo packs; W22 resistors are on tape-and-reel;
W23 and W24 resistors are loose-packed in boxes.
Standard quantities per package
Type
Pack-
aging
Code
A
R
B
W21
W215
W22
W23
W24
Ammo
pack
Reel
Box
1000
-
-
750
-
-
-
700
-
-
-
50
-
-
25
A
6
f
2
f
1
10±0.5
Type
W21
A
63±2
f - f
≤1.4mm
1 2
W215 73±2
W22 73±2
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of printing.
A subsidiary of
TT electronics plc
W20 Series Issue November 2006
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
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