Page 1
Vitreous Enamelled
Electrical Data
IRC
Type
Power Rating
@ 25°C
(watts)
Resistance
Range
(ohms)
Tolerance
(±%)
TCR
(-55°C to 200°C)
(±ppm/°C)
Limiting
Element
Voltage
(volts)
Thermal
Impedance*
(°C/watt)
Operating
Temperature
Range
(°C)
W21
3.0
1 - 10K 1
Typical: <+75
Maximum: +200
100 88 -55 to 3500.5 - 10K 2
0.1 - 10K 5
W215
5.0
1 - 15K 1
Typical: <+75
Maximum: +200
160 58 -55 to 3500.5 - 15K 2
0.1 - 15K 5
W22
7.0
1 - 20K 1
Typical: <+75
Maximum: +200
200 44 -55 to 3500.5 - 20K 2
0.1 - 20K 5
W23
10.0
1 - 60K 1
Typical: <+75
Maximum: +200
500 29 -55 to 3501 - 60K 2
0.15 - 60K 5
W24
14.0
1 - 100K 1
Typical: <+75
Maximum: +200
750 22 -55 to 3501 - 100K 2
0.2 - 100K 5
• High stability and reliability
• High purity ceramic substrate
• High power dissipation for size
• Suitable for harsh environments
• Rugged all-welded construction
• Impervious lead free vitreous enamel coating
• Overload characteristics ideal for protection circuits
*See temperature rise graph
W20 Series
Vitreous Enamelled
Wirewound Resistors
Wirewound Resistors
W20 Series
· High stability and reliability
· High purity ceramic substrate
· High power dissipation for size
· Suitable for harsh environments
· Rugged all-welded construction
· Impervious lead free vitreous enamel coating
· Overload characteristics ideal for protection circuits
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
09. 11
Page 2
Vitreous Enamelled
Dimensions (mm) and Weight (g)
IRC Type
L
max
D
max
f
min
d
nom
Wt.
nom
W21
12.7 5.6 22.75 0.8 1
W215
22.0 7.0 23.1 0.8 2
W22
22.2 8.0 23.1 0.8 2
W23
38.0 8.0 --- 0.8 3.5
W24
53.5 8.0 --- 0.8 5
Physical Data
L
f
D
d dia.
CONSTRUCTION
A high purity ceramic substrate is assembled with interference fi t end caps to which are welded the termination
wires. The resistive element is wound on the substrate and welded to the caps; the vitreous enamel protective
coating is then applied.
TERMINATIONS
Material: Copper clad steel wire, nickel plated and solder-coated.
Length: W23’s and W24’s are not supplied on tape. Minimum length is 30mm.
MARKING
The resistors are legend marked with type reference, resistance value and tolerance.
SOLVENT RESISTANCE
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed
circuits.
W20 Series
Vitreous Enamelled
Wirewound Resistors
Wirewound Resistors
W20 Series
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
09. 11
Page 3
Vitreous Enamelled
APPLICATION NOTES
The terminations should not be bent closer than 1.6mm from the body, and the recommended minimum bend
radius is 1.2 mm. Terminations are solderable to within 4mm from the body.
When cold, vitreous enamel has excellent insulation resistance. In common with all insulations the specifi c resistance of the enamel decreases with increase in temperature. Therefore, resistors operated at near maximum
temperature cannot be classed as insulated and should not be used in contact with any conducting 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.
Environmental Data
Test
Actual Performance
Maximum Typical
Load at Commercial Rating: 1000 Hours @ room temperature
5 3.5
Dry Heat: 1000 hours @ 200°C
21
Shelf Life: 12 months at room temperature
0.03 0.02
Short Term Overload
.47 0.1
Climatic
0.5 0.2
Long Term Damp Heat
0.05 0.02
Temperature Rapid Change
0.5 0.2
Resistance to Solder Heat
0.25 0.03
Vibration and Bump
0.25 0.05
Noise (In a Decade of Frequency)
zero zero
Robustness
0.4 0.05
Insulation Resistance
>1 G ohm >1 G ohm
Voltage Proof
500 min 500 min
'R%
'R%
'R%
'R%
'R%
'R%
'R%
'R%
'R%
µV/V
'R%
ohms
volts
Temperature Rise Curve
W20 Series
Vitreous Enamelled
Wirewound Resistors
W22
Dissipation (watts)
Temperature Rise (°C)
0
5 10 15 20
400
300
200
100
W215 W22 W23 W24
Wirewound Resistors
W20 Series
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
09. 11
Page 4
Vitreous Enamelled
For W21, W215, and W22 resistors the standard method of packaging is taped in ammo packs. Alternatives
available by special request are:
- Taped and reeled
- Loose packed in boxes (minimum lead length 30mm). W23’s and W24’s are available only as loose
packed in boxes.
Packaging
W20 Series
Vitreous Enamelled
Wirewound Resistors
Ordering Data
Sample Part No.
IRC Type
Value
Tolerance Code
J = 5%, G = 2%, F = 1%
RoHS Indicator
LF indicates RoHS compliance
Packaging Details
W21
Specify type, reference, etc. as indicated in this example of
W21, 0.1K:, 5%, taped and ammo packed.
9K1 J LF A
b
f
1
10 ± 0.5
6
6
f
2
Body location: f
1 - f2 ≤ 1.4mm
Type A
W21
63 ± 2
W215
73 ± 2
W22
73 ± 2
Standard Quantities Per Package
Type Code W21 W215 W22 W23 W24
Ammo Pack A 1000 600 500 --- ---
Reel R 1000 800 700 --- ---
Small Box SB 200 100 100 50 25
Large Box LB 800 500 300 --- ---
Wirewound Resistors
W20 Series
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
09. 11
Loading...