3500 SERIES/LOW THERMAL EMF REED RELAYS
3500 Series Low Thermal EMF Reed Relays
The 3500 Series is ideally suited to the needs of Instrumentation, Data Acquisition and
Process Control. The specification tables allow you to select the appropriate relay for
your particular application. Recommended for use in high accuracy DVM’s, Multi-
plexers and Digital or Analog Multipoint Recorders. If your requirements differ from
the selection options, please consult Coto’s Factory to discuss a custom reed relay.
3500 Series Features
u
Low Thermal EMF: < 10 µV through < 0.5 µV with 50 nV stability
u
Patented Low Thermal Design. U.S. Patent #4,084,142
u
Low power coils to ensure low thermal EMF
u
High Insulation Resistance - 10
12
Ω
u
Control/Signal isolation of 1500 VDC
u
High reliability, hermetically sealed contacts
u
Form A, Dry or Hg Wetted contacts. High Dielectric Strength
u
Epoxy coated steel shell provides magnetic shielding
u
RoHS compliant (except for 3520)
DIMENSIONS
in Inches (Millimeters)
1.20
(30.48)
.500
(12.7)
.485 MAX
(12.32)
.050
(1.27)
.500
(12.7)
.485 MAX
(12.32)
.125
(3.17)
1.00
(25.4)
.200
(5.08)
.300
(7.62)
.050
(1.27)
.100
(2.54)
.100
(2.54)
.026 DIA.
(0.66)
13
1
For Model
3501 & 3540
For Model
3502, 3520 & 3541
14
2
Bottom View
Ordering Information
XXXX-XX-X1X
Part Number
Shielding Options
2
Model Number
1=Electrostatic Shield
3501 3502 3520 3540 3541
Coil Voltage
05=5 volts
Thermal EMF Rating
12=12 volts
See available ratings in specification table.
1=<10µV Hg Wetted Only
9=<5µV Dry or Wetted
8=<3µV Dry Only
7=<1µV Dry Only
5=<0.5µV Dry Only
07082013
tel: (401) 943.2686
|
fax: (401) 942.0920
MODEL NUMBER
Parameters
Test Conditions
Measured after
5 minutes at nominal
coil voltage
3501
2
Units
3502
2
3520
2,3
Hg Wetted
3540
2
3541
2
1 Form A 2 Form A 1 Form A 1 Form A 2 Form A
Individual
<5µV
<3µV
<1µV
<0.5µV
5 12
350 2000
3.8 9.0
0.4 1.0
200
0.5
1.5
10
500
0.200
0.300
Differential
<5µV
<3µV
<1µV
<0.5µV
5 12
350 2000
3.8 9.0
0.4 1.0
200
0.5
1.5
10
100
0.100
0.200
Differential
<10µV
<5µV
-
-
5 12
200 850
3.8 9.0
0.4 1.0
500
1.0
2.0
28
1000
0.050
0.100
Individual
<5µV
<3µV
-
-
5 12
250 1500
3.8 9.0
0.4 1.0
500
0.5
2.0
10
100
0.200
0.300
Differential
<5µV
<3µV
-
-
5 12
250 1500
3.8 9.0
0.4 1.0
500
0.5
2.0
10
100
0.100
0.200
High Voltage High Voltage
Thermal EMF Options
µV
(Refer to Reed Relay
Technical Section for details)
COIL SPECS.
Nom. Coil Voltage
Coil Resistance
Operate Voltage
Release Voltage
+/- 10%, 25° C
Must Operate by
Must Release by
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Signal Level 1.0V, 10mA
50mV, 10mA
0.5V, 50mA
at 100 Hz, 1.5 msec
Between all Isolated Pins
at 100V, 25°C, 40% RH
No Shield
Shield Guarding
Between Contacts
Contacts to Shield
Contacts/Shield to Coil
At Nominal Coil Voltage,
30 Hz Square Wave
VDC
Ω
VDC - Max.
VDC - Min.
Volts
Amps
Amps
Watts
x 10
6
Ops.
Ω
Ω
CONTACT RATINGS
Switching Voltage
Switching Current
Carry Current
Contact Rating
Life Expectancy-Typical
1
Static Contact
Resistance (max. init.)
Dynamic Contact
Resistance (max. init.)
Insulation Resistance
(minimum)
Capacitance - Typical
Across Open Contacts
Dielectric Strength
(minimum)
Operate Time - including
bounce - Typical
Release Time - Typical
RELAY SPECIFICATIONS
Ω
pF
pF
VDC/peak AC
VDC/peak AC
VDC/peak AC
msec.
msec.
13
10
12
3.0
1.9
700
1000
1500
0.75
0.1
5 1
10
12
1.7
0.2
350
1000
1500
0.75
0.1
13 9 5 1
10
12
1.7
0.2
1000
1000
1500
2.0
1.0
13 9 5 1
13
10
12
3.0
1.9
1500
1000
1500
1.0
0.2
5 1
10
12
1.7
0.2
1500
1000
1500
1.0
0.2
13 9 5 1
Top View
4
:
Dot stamped on top of relay refers to pin #1 location
Grid = .1”x.1” (2.54mm x 2.54mm)
UP
Notes:
1
Consult factory for life expectancy at other switching loads.
2
Models 3501 and 3540, optional electrostatic shield is tied to pin #5.
Models 3502, 3520 and 3541, optional electrostatic shield is tied to pin #13.
3
Model 3520 has Hg wetted contacts - position sensitive, must be mounted within 30° of vertical plane. See schematic. Hg content per cap-
sule: Form A, 0.04 grams.
12
4
10 6 2
10 6 2
12
4
10 6 2
Environmental Ratings:
Storage Temp:
-35°C to
+
100°C;
Operating Temp:
-20°C to
+
85°C;
Solder Temp:
270°C max; 10 sec. max
All electrical parameters measured at 25°C unless otherwise specified.
Vibration:
20 G’s to 2000 Hz;
Shock:
50 G’s
07082013
For most recent data visit www.cotorelay.com
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