LOW THERMAL EMF

Pickering’s Series 100 and 101 have internal thermal EMF levels as low as 1 microvolt for single pole types or even lower for two pole types used for differential switching, where there can be some cancellation of the thermal EMF voltages from the two switches.

1 Form A, 2 Form A, 1 Form B and 1 Form C configurations available.

Low power consumption, ideal for portable equipment.

electronic measuring instruments in hitech computer laboratory

Recommended Reed Relays for Low Thermal EMF

Series 100 – Low Thermal EMF

Thermal EMF about 1 microvolt or less. 1 Form A, 2 Form A, 1 Form B & 1 Form C. 3, 5, 12 or 24 V coils. Suitable for data acquisition or thermocouple switching.

The Pickering Series 100 is a complete range of Single-in- Line (SIL) reed relays primarily intended for direct drive from 4000B CMOS or similar low current sources. They feature a very low level of thermal EMF.

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Series 101 – Low Capacitance

Thermal EMF Direct drive from 74HC or HCT. 1 Form A, 2 Form A, 1 Form B & 1 Form C. 3, 5, 12 or 24 V coils. Suitable for battery powered portable equipment.

The Series 101 have very high coil resistances. 5 Volt dry versions may be driven directly from 74HC or 74HCT logic without the need for additional drivers. 74HC logic will drive up to 4mA at 5 Volts, therefore a coil resistance of 1600 ohms is desirable to avoid running the IC at its maximum rating.

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Evaluation Samples

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Shop Reed Relays for Low Thermal EMF

The below table will help you narrow down our offering to get you the correct reed relay for your application.

Once you narrow your selections down you can download a reed relay data sheet for more information or request a quote to find out prices and lead times.

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PEL Series
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PEL Contact Configuration
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Switching Current
(Amps)
Switching Power
(Watts)
PEL Diode
Switching Voltage
(DC/AC peak)
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(DC/AC peak)
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Part Number
Contact Configuration
Switching Current (Amps)
Switching Power (Watts)
Switching Voltage (DC or AC peak)
Stand-off Voltage (DC or AC peak)
Coil Voltage
Coil Resistance (Ω)
Switch Type
Diode
Depth (mm)
Width (mm)
Height (mm)
View Datasheet
Stock
Price
Add to Bag
1 Form A - SPST N.O.
0.5
Amps
10
200
240
5V
3000 Ω
Low Level Special
No
7.4
20.1
9.4
0 - MTO
$9.30
2 Form A - DPST N.O.
1
Amps
15
200
240
5V
1000 Ω
General Dry Reed
No
7.4
20.1
9.4
0 - MTO
$11.25
1 Form A - SPST N.O.
2
Amps
50
500
550
24V
3000 Ω
Std Mercury Reed
Yes
7.4
20.1
9.4
19
$61.05
Max: 19
Min: 1
Step: 1
Add
2 Form A - DPST N.O.
0.5
Amps
10
200
240
24V
6000 Ω
Low Level Dry Reed
Yes
7.4
20.1
12.5
0 - MTO
$13.07
1 Form A - SPST N.O.
1
Amps
20
200
240
24V
6000 Ω
General Dry Reed
No
7.4
20.1
9.4
0 - MTO
$10.01
1 Form C - SPDT Changeover
0.25
Amps
3
200
200
12V
6000 Ω
Changeover
No
7.4
20.1
9.4
0 - MTO
$13.87
1 Form A - SPST N.O.
0.5
Amps
10
400
440
5V
1600 Ω
High Voltage Reed
Yes
7.4
20.1
9.4
0 - MTO
$13.35
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