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

Ultra-High Value
Precision Resistor
3810 Series
• Low Voltage
• Hermetically sealed
• Resistance range up to 100T ohms (10¹⁴ ohms)
• Designed for low current (pica ampere level) measurements
• Leakage current minimised by hermetic sealing and guard ring
Glass to metal seal
Glass Envelope
Flexible connecting coil
Solder coated leads
Electrical Data
IRC
Type
Resistance
Range
(ohms)
Limiting
Element
Voltage
(volts)
TCR
(20°C - 70°C)
ppm/°C
Resistance
Tolerance
(%)
Values
Operating
Temperature
Range (°C)
Voltage Coefficient of Resistance
(measured at voltages of 100 & 500 volts)
ppm/volt
100MΩ
1TΩ
100TΩ
3810 100M to 1T 500
10, 20
-20
EIA 2%
3811 100M to 1T 1000 -500 to -3500 1, 2, 5, 10 values -40 to 100
-10
preferred
3812 1T to 100M 1000
2, 5, 10
-10
-160
-80
-80
-150
-150
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
Shelf Life (12
Voltage (1000 hrs months at room
at 20°C) ∆R% temperature) ∆R%
1
0.5
Resistance To
Solder Heat
∆R%
<0.1
Inductance
Capacitance
pF
Low inductance versions
3810 3811
available in the range 100M to 1T _{0.4 0.2}
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: [phone] • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
3810 Series Issue July 2008 Sheet 1 of 2