3810 Datasheet, PDF (1/2 Pages) Welwyn Components Limited – Ultra-High Value Precision Resistors

Ultra-High Value
Precision Resistors
Welwyn Components
3810 Series
• Resistance range up to 100 T ohms
(10¹⁴ 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
Resistance range
Limiting element voltage
TCR (20°C to 70°C)
Resistance tolerance
Values
Ambient temperature range
ohms
volts
ppm/°C
%
°C
3810
100M to 1T
500
10, 20
3811
100M to 1T
1000
-500 to -3500
1, 2, 5, 10
E24 preferred
-40 to 100
3812
1T to 100T
1000
1T to 10T; 2, 5, 10 >10T; 5, 10
Physical Data
Dimensions (mm) & Weight (g)
PCB
Min.
Type
L max D max f min d nom mounting Bend Wt. nom
3810
25.0
6
3811
42.9
6
Centres Radius
30
0.6
29.2
0.6
1.5
30
0.6
47.1
0.6
2.2
d
D
L
f
3812
48.0
6
30
0.6
52.2
0.6
2.5
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.
Terminations
Material
Solder-coated Dumet wire.
Strength
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
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.)
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.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue D · 03.06
203