High Value Thick Film
Resistors
GC Series
Welwyn Components
•
•
•
•
High working voltage to 10kV
Value up to 1G ohm
Custom product available
High stability thick film
Electrical Data
GC55
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR (20°C to 70°C)
Resistance tolerance
Values
Thermal impedance
Ambient temperature range
°C/watt
°C
140
watts
ohms
Volts dc or ac Peak
volts
ppm/°C
%
0.25
47k to 900 meg
1700
GC65
0.5
47k to 900 meg
3500
700
100
1, 2, 5
E24 & E96 preferred
90
- 55 to 155
70
GC70
1.0
47k to 1G
10000
Physical Data
Dimensions (mm) and Weight (g)
PCB
mounting
Type
GC55
GC65
GC70
L max.
6.2
9.0
14.5
D max.
2.5
3.6
5.3
f min.
21.0
19.6
23.6
d nom.
0.6
0.8
0.8
centres
10.2
13.7
20.3
Min
bend
radius
0.6
1.2
1.2
Wt
nom.
0.3
0.6
1.1
d
D
L
f
Construction
Thick film material is fired on to high grade ceramic rods.
Nickel plated steel caps are force fitted and the termination
wires are welded to the caps. The value is obtained by a
helical cut in the film and finally the resistor body is given a
high temperature protective coating.
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Marking
1% tolerance resistors are colour coded with 5 bands, 2%
and 5% tolerance have 4, IEC 62 colours are used.
Terminations
Material
Strength
Solder coated copper wire.
The terminations satisfy the requirements of
IEC 68.2.21.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuit boards.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Issue B · 03.02
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
199
High Value Thick Film
Resistors
GC Series
Welwyn Components
Performance Data
Maximum
Load at rated power: 1000 hrs at 70°c
Derating
Overload
Climatic
Climatic category
Temperature rapid change
Resistance to Solder Heat
Vibration and bump
Voltage proof
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
volts
1
0.2
0.1
1000 min.
1
1
55/155/56
0.15
0.03
0.02
∆R%
1
Zero at 155°C
0.2
0.25
Typical
0.5
N.B. This product can be custom built to meet specific voltage coefficient or pulse requirements.
Packaging
The standard method of packaging GC resistors is taped in
ammo packs. Taped resistors on reel or loose packed
components can also be supplied by special request. In the
case of tape packed components the usable lead length is
reduced by the width of the tape. A detailed taping
specification is available on request.
Standard Quantities Per Spool/Box
Type
Taped (Reeled)
Ammo pack
Small box
Large box
GC55
5000
5000
250
1000
GC65
2500
2500
125
500
GC70
1500
1000
25
250
Figure 2
c
f
1
6
b
f
2
6
Body Location f
1
– f
2
≤
1.4 mm
Type
GC55/GC65
GC70
b
52
67
c
5
10
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
200
Issue B · 03.02
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