Ultra-High Value
Precision Resistor
3810 Series
•
Low Voltage
•
Hermetically sealed
•
Resistance range up to 100T ohms (10 ohms)
•
Designed for low current (pica ampere level) measurements
•
Leakage current minimised by hermetic sealing and guard ring
Flexible connecting coil
Solder coated leads
14
Glass to metal seal
Glass Envelope
Electrical Data
IRC
Type
3810
3811
3812
Resistance
Range
(ohms)
100M to 1T
100M to 1T
1T to 100M
Limiting
Element
Voltage
(volts)
500
1000
1000
-500 to -3500
TCR
Resistance
(20°C - 70°C) Tolerance
ppm/°C
(%)
10, 20
1, 2, 5, 10
2, 5, 10
EIA 2%
values
preferred
-40 to 100
Values
Operating
Temperature
Range (°C)
Voltage Coefficient of Resistance
(measured at voltages of 100 & 500 volts)
ppm/volt
100MΩ
-20
-10
-10
1TΩ
-160
-80
-80
-150
-150
100TΩ
CONSTRUCTION:
The Cermetox resistive film is fired onto a high
quality ceramic substrate; brass end caps are force fitted to the
substrate which is then adjusted to value with a hellical 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 utilize two resistors connected in series within
the glass envelope. High value units, type 3812, are part filled with
silicone oil. the guard band is described, with application notes, in
a Product Information sheet, available on request.
TERMINATIONS:
Solder-coated dumet-wire.
MARKING:
Type reference, TCR code, resistance value
and tolerance code are legend marked. 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 vapors. (See application notes.)
PACKAGING:
Each resistor is individually packed in a
polythene envelope together with a card carrying measure-
ment details and serial number. (See application notes.)
Performance Data
Typical
Load at Rated
Voltage (1000 hrs
at 20°C)
∆
R%
1
Shelf Life (12
months at room
temperature)
∆R%
0.5
Resistance To
Solder Heat
∆R%
Inductance
Low inductance versions
available in the range 100M to 1T
Capacitance
pF
3810
0.4
3811
0.2
<0.1
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 going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
3810 Series Issue July 2008 Sheet 1 of 2
IRCTT [ IRC - A TT ELECTRONICS COMPANY. ]
