Ultra-High Value
Precision Resistors
3810 Series
Welwyn Components
•
Resistance range up to 100 T ohms
(10
14
ohms)
•
Designed for low current (pica ampere level)
measurements
•
•
•
Low voltage coefficient
Hermetically sealed
Leakage current minimised by hermetic
sealing and guard ring
Electrical Data
3810
Resistance range
Limiting element voltage
TCR (20°C to 70°C)
Resistance tolerance
Values
Ambient temperature range
°C
ohms
volts
ppm/°C
%
10, 20
100M to 1T
500
3811
100M to 1T
1000
-500 to -3500
1, 2, 5, 10
E24 preferred
-40 to 100
1T to 10T; 2, 5, 10 >10T; 5, 10
3812
1T to 100T
1000
Physical Data
Dimensions (mm) & Weight (g)
PCB
Type
3810
3811
3812
L max
25.0
42.9
48.0
D max
6
6
6
f min
30
30
30
d nom
0.6
0.6
0.6
mounting
Centres
29.2
47.1
52.2
Min.
Bend
Radius
0.6
0.6
0.6
Wt. nom
d
1.5
2.2
2.5
D
L
f
Construction
The Cermetox resistive film is fired onto high quality ceramic
substrate; brass end caps are forced fitted to the substrate
which is then adjusted to value with a helical cut in the film;
the leads are mechanically locked into the end caps and the
assembly sealed into the glass envelope. All close tolerance
units utilise two resistors connected in series within the glass
envelope. The guard band is described, with application
notes, in a Product Information sheet, available on request.
®
Marking
The serial number, resistance value and tolerance code are legend
marked. The resistance value marking conforms to IEC 62.
Solvent Resistance
The glass envelope is coated with silicone and should not be
subjected to solvents or their vapours. (See Application
Notes.)
Terminations
Material
Strength
Solder-coated Dumet wire.
The terminations meet the requirements of
IEC 68.2.21
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
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 D · 03.06
© 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
203
WELWYN [ WELWYN COMPONENTS LIMITED ]
