Ultra-High Value
Precision
Value
Resistors
Ultra-High
Resistors
14
3810 Series
Welwyn Components
Make Possible
Precision Resistors
3810 Series
Ultra-High Value
•
Resistance range up to 100 T
Precision Resistors
ohms
(10 ohms)
•
Resistance range
current
100 T ohms
level)
•
Designed for low
up to
(picoampere
3810 Series
Resistance
for low
to 100 T ohms
up
current (picoampere level)
•
Designed
range
coefficient
(10 ohms)
Low voltage
•
14
Welwyn Components
(10
14
ohms)
measurements
Designed for low
measurements
current (picoampere level) measurements
•
Low voltage coefficient
Hermetically sealed
•
Low voltage coefficient
Leakage current
•
Hermetically sealed
minimised by hermetic
•
Hermetically sealed
Leakage current minimised by hermetic sealing and guard ring
sealing and guard ring
•
Leakage current minimised by hermetic
sealing and guard ring
Electrical Data
Resistance range
Resis
i
t
tin
ce
el
ange
nt voltage
Lim
a
g
r
em
L
TC
i
R
ing
0°
em
to
t vol
C)
ge
im t
(2
el
C
en
70°
ta
T
Resi
(
st
0°C
e
o
tol
0°C)
ce
CR 2
anc
t 7
eran
Resistance tolerance
Values
Electrical Data
3810
ohms
ohms
volts
volts
m/°C
pp
ppm/°C
%
°C
100M to 1T
00
5
500
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
3811
3811
100M to 1T
100M to 1T
1000
1000
-500 to -3500
-500 to -3500
2, 5, 10
1,
1, 2, 5, 10
E24 preferred
-40 to 100
3812
1T to 100T
1000
3812
1T to 100T
1000
1
3810
00M to 1T
%
10, 20
10, 20
1T to 10T; 2, 5, 10 >10T; 5, 10
Values
E24 preferred
-40 to 100
1T to 10T; 2, 5, 10 >10T; 5, 10
Ambient temperature range
Ambient temperature range
°C
Physical Data
Physical Data
Dimensions (mm) & Weight
Dimensions (mm) & Weight (g)
(g)
PCB
PCB
Min.
Type
Type
3810
3810
3811
3811
3812
Min.
L max
Wt.
L max
D max
D max
f min
min
d nom
nom mounting
f
d
mounting Bend
Bend
nom
nom
Wt.
Centres Radius
Radius
Centres
25.0
25.0
42.9
42.9
48.0
6
6
6
6
6
30
30
30
30
30
0.6
0.6
29.2
29.2
0.6
0.6
0.6
47.1
47.1
0.6
0.6
0.6
1.5
0.6
2.2
0.6
2.5
d
1.5
2.2
2.5
D
d
D
L
L
f
f
3812
48.0
6
30
0.6
52.2
52.2
0.6
Construction
®
Construction
The Cermetox resistive film is fired onto high quality ceramic
Marking
The serial number, resistance value and tolerance code are legend
The Cermetox
®
resistive film is fired onto high quality
The
resistance value marking conforms to IEC 62.
substrate; brass end caps are forced fitted to the substrate
ceramic
marked. The
serial number, resistance value and tolerance code are legend
substrate; brass end caps are forced fitted to the substrate
marked. The resistance value marking conforms to IEC 62.
which is then adjusted to value with a helical cut in the film;
which is then adjusted
locked into the
helical cut in the
the leads are mechanically
to value with a
end caps and the
film;
Solvent Resistance
assembly sealed into the glass
locked into the end caps and the
The glass envelope
Resistance
silicone and should not be
the leads are mechanically
envelope. All close tolerance
Solvent
is coated with
units utilise
sealed into the glass envelope.
within the
tolerance
subjected to
glass envelope is coated
(See Application
assembly
two resistors connected in series
All close
glass
The
solvents or their vapours.
with silicone and should not be
envelope. The
two resistors connected
with application
the glass
Notes.)
subjected to solvents or their vapours. (See Application
units utilise
guard band is described,
in series within
notes, in a Product Information sheet, available on
application
envelope. The guard band is described, with
request.
Notes.)
notes, in a Product Information sheet, available on request.
Solder-coated Dumet wire.
Marking
Terminations
Material
Strength
Material
Terminations
Solderability
The terminations meet the requirements of
IEC 68.2.21
IEC 115-1, Clause 4.17.3.2
Strength
The terminations meet the
wire.
Solder-coated Dumet
requirements of
IEC 68.2.21
The terminations meet the requirements of
General Note
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.
Solderability
The terminations meet the requirements of
TT Electronics reserves the right to make changes in
and is considered accurate at time
or liability.
to print.
All information is subject to Welwyn’s own data
product specification without notice
of going
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
General Note
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Welwyn
+44 (0) 1670
Telephone:
Components reserves the right to make changes in product specification without notice or liability.
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
www.ttelectronicsresistors.com
Issue D · 03.06
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
07.14
TT electronics plc
203
A subsidiary of
Ultra-High Value
Ultra-High Value
Precision Resistors
Precision Resistors
3810 Series
3810 Series
Make Possible
Welwyn Components
Performance Data
Maximum
Load at rated voltage: 1000 hours at 20°C
Shelf life: 12 months at room temperature
Resistance to solder heat
Capacitance
3810
3811
∆
R%
∆
R%
∆
R%
pF
pF
2
1
0.2
0.4
0.2
Typical
1
0.5
<0.1
Voltage coefficient of resistance
100MΩ
3810
3211
3812
-20
-10
-10
1TΩ
-160
-80
-80
ppm/volt
100TΩ
-150
-150
Measured at voltages
of 100 and 500 volts
Application Notes
Each resistor is packed with a card stating nominal resistance
value at 100 V applied, selection tolerance, date and serial
number.
Although the glass envelope is an excellent insulant and
would be adequate in a dry atmosphere, the condensation
which occurs in a normal atmosphere will provide a shunt
resistance which will modify the very high resistance value. To
minimise this effect all units are coated with silicone, and it is
essential that this coating is not damaged; any handling
should be by the terminations. For the same reason solvents
must not be used.
The resistors should not be used in a damp atmosphere. If
moisture develops on the body the resistor should be dried
for 30 minutes at 70°C and allowed to cool for a further 30
minutes in a dry atmosphere.
To avoid damage to the seal between terminations and glass,
the leads must be fully supported inside the point of bending
during any preforming.
Guard Band
For details of how to use the guard band, fitted to resistors of
100 G ohms and over, ask for Product Information Sheet
detailing application notes for glass sealed resistors with
guard band.
Non-standard versions
Units without glass envelopes but with lacquer protection are
available, but will have a limited electrical performance.
Measured values at a voltage other than 100V may be
recorded.
For non-standard items contact Welwyn Components.
Packaging
Each resistor is individually packed in a polythene envelope
together with a card carrying measurement details and serial
number (See Application Notes).
Ordering Procedure
Example: 3812 at 10 teraohms and 2% tolerance -
3812
–
10TG
I
Type
Value (use IEC62 code)
F
G
Tolerance (use IEC62 code)
1%
2%
J 5%
K 10%
Packing
I
Individual/Bulk
Standard
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General Note
(0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44
TT Electronics reserves the right to make changes in product specification without notice or liability.
204
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
Issue D · 03.06
www.ttelectronicsresistors.com
© TT Electronics plc
07.14
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