High Power & High Voltage SIL/SIP Reed Relays

Series 144

Package4
 1 A switching at up to 80 W
Type
3
 2 A switching at up to 60 W
 Up to 3 kV stand-off
2
1
 Switching Voltage 1000 VDC up to 10 W
 Up to 3 A continuous carry current
 Small size. Stacking on 0.25 Inches pitch Internal mu-metal magnetic screen
 1 Form A, 2 Form A & 1 Form B configurations
 5 V, 12 V or 24 V Coils with optional internal diode Additional build options are available including many pin configurations
 Many benefits compared to industry standard relays (see last page) Suitable for high power applications and in many cases, may be used as an alternative to mercury
wetted reed relays or miniature electromechanical relays
The Series 144 reed relays are ideal for mixed signal semiconductor testers, photovoltaic and EV applications, mining
gas analysis, medical electronics, in-circuit test equipment, high voltage instrumentation, and much more. In many cases
they can also be an alternative to mercury wet reed relays or miniature electromechanical relays, where the low level
performance and high isolation can be a significant advantage.
The Series 144 feature sputtered ruthenium contacts instead of the more common rhodium associated with higher power
reed relays. This combines their ability to switch higher power with excellent low level performance, making them the ideal
choice where both high power and low level switching is required. The range also features an internal mu-metal screen toeliminate problems that would otherwise be experienced due to magnetic interaction when they are closely stacked.
With a maximum switching voltage of 1000 VDC up to 10 W and the option of 2 or 3 kV DC standoff makes these relays
suitable for a very wide range of applications. The 3 kV versions having an increased clearance between the switch and thecoil pins to accommodate the higher voltage. For information on the recommended spacing between high voltage parts
please see page 3.

Magnetic Interaction

Percentage
Interaction
20%(Change inoperate voltage)
10%

Unscreened

Other Manufacturers’Partially screened relays

40%

30%

Key:

Pickering
relaysInternal
mu-metal
screenOther Unscreened
relaysComplete
mu-metal
can

109P
110
116
111P
112 117 115
113

108
109
111 119

Partially
screened

106

104
114
144

105

0.19”

0.245”

101

100
100HV
100HC

0.26”

0.29”

0.40”

0.26”

0.29”

0.40”

107
0.145”

Magnetic Interaction
This chart demonstrates thepercentage changes in operate
voltage due to magnetic
interaction depending on thelevel of magnetic screening
offered from the relay package.
For more information onmagnetic interaction click here.

ISSUE 1.0 MAR 2024

Other Manufacturers’
Unscreened relays

50%

Relay Package Width (Inches)

0.145”

0.19”
0.245”
Package Width (Inches)1

pickeringrelay.com

Specification

High Power & High Voltage SIL/SIP Reed Relays – Series 144

Switch Ratings - Dry Switches
1 Form A (energize to make)1 Form B (energize to break)

2 Form A (energize to make)2000 VDC min stand-off
Up to1000 VDC switching*
Up to 80 W switching*3000 VDC min stand-off
Up to1000 VDC switching*
Up to 80 W switching*2000 VDC min stand-off
Up to1000 VDC switching*
Up to 80 W switching*2000 VDC min stand-off
Up to1000 VDC switching*
Up to 80 W switching*––* See contact ratings.

Dry Reed: Series 144 switch ratings - contact ratings for each switch typeMax.
Switch Switch PowerswitchNoform rating
current
2

3

A or B
A or B
A or B
A
A
A

80 W
60 W
10 W
80 W
60 W
10 W

1A
2A
10 mA
1A
2A
10 mA

Max.
carry
currentMax.
switching
volts

3A
3A
3A
3A
3A
3A

250
250
1000
250
250
1000

Life
Min.
expectancy
stand-off
ops typicalvolts(see Note1)
2000
3000
2000
3000
2000
3000

108
108
108
108
108
108

Operatetime incbounce(max)

Releasetime

Specialfeatures

1.0 ms
1.0 ms
1.0 ms
1.0 ms
1.0 ms
1.0 ms

0.5 ms
0.5 ms
0.5 ms
0.5 ms
0.5 ms
0.5 msHigh voltage
High voltage
High voltage
High voltage
High voltage
High voltage

For more information for the Series 144 switching specifications, see our application guide Determining Switching Specifications.
Note1: Life Expectancy
The life of a reed relay depends upon the switch load and end of life criteria. For example, for an ‘end of life’ contact
resistance specification of 1 Ω, switching low loads (10 V at 10 mA resistive) or when ‘cold’ switching, typical life is approx
1 x 109 ops. At the maximum load (resistive), typical life is 1 x 107 ops. In the event of abusive conditions, e.g. high currents
due to capacitive inrushes, this figure reduces considerably. Pickering will be pleased to perform life testing with any
particular load condition.

Operating Voltages - Standard
Coil voltage - nominal

Must operate voltage - maximum at 25 °C

Must release voltage - minimum at 25 °C

5V
12 V
24 V

3.75 V
9V
18 V

0.5 V
1.2 V
2.4 V

Environmental Specification/Mechanical Characteristics
In the table below, the upper temperature limit can be extended to +125 °C if the coil drive voltage is increased toaccommodate the resistance/temperature coefficient of the copper coil winding. This is approximately 0.4% per °C. Thismeans that at 125 °C the coil drive voltage will need to be increased by approximately 40 x 0.4 =16% to maintain therequired magnetic drive level. Please contact sales@pickeringrelay.com for assistance.
Standard Operating Temperature Range-20 ºC to +85 ºC

Standard Storage Temperature Range-35 ºC to +100 ºC

Shock Resistance

50 g

Vibration Resistance (10 - 2000 Hz)

20 g

Soldering Temperature (max) (10 s max)

270 ºC

Washability (Proper drying process is recommended)

Fully Sealed2

pickeringrelay.com

Pin 1

Specification

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.02
(0.5)

0.01
(0.25)High Power & High Voltage SIL/SIP Reed Relays – Series 144

Recommended Spacing for High Voltage Parts
When working with high voltages, the recommended
space between pins is 2 mm per 1 kV stand-off voltage.
For example, the 3 kV version of the 144 should have a
gap of 6 mm between the pins.

mm
66 mm

Dry Relay: Series 144 Coil Data and Type Numbers

Device TypeType Number

1 Form A
Switch No. 2 (2 kV)
Package Type 1 *1 Form A
Switch No. 3 (3 kV)
Package Type 2
1 Form B
Switch No. 2 (2 kV)
Package Type 3
2 Form A
Switch No. 2 (2 kV)
Package Type 4

Coil
(V)

Max.
Coil
contact
resistance resistance(initial)

144-1-A-5/2D

5

200 Ω

144-1-A-12/2D

12

750 Ω

144-1-A-24/2D

242000 Ω

144-1-A-5/3D

5

200 Ω

144-1-A-12/3D

12

750 Ω

144-1-A-24/3D

242000 Ω

144-1-B-5/2D

5

300 Ω

144-1-B-12/2D

121000 Ω

144-1-B-24/2D

242200 Ω

144-2-A-5/2D

5

100 Ω

144-2-A-12/2D

12

350 Ω

144-2-A-24/2D

241000 Ω

Insulation resistance(minimum at 25 °C)(see Note4)

Capacitance(typical)(see Note2)

Switchto coilAcrossswitchClosedswitchto coilAcrossopen
switch0.15 Ω

1012 Ω

1012 Ω

2.5 pF

0.1pF

0.15 Ω

1012 Ω

1012 Ω

2.5 pF

0.1pF

0.20 Ω

1012 Ω

1012 Ω

2.5 pF

0.1pF

0.20 Ω

1012 Ω

1012 Ω

See
Note3

See
Note3

When an internal diode is required, the suffix D is added to the part number as shown in the table.
* Package Type 2 available, contact Pickering for more details.
Note2: Capacitance across open switch
The capacitance across the open switch was measured with other connections guarded.
Note3: Capacitance values
The value will depend upon on the mode of connection/guarding of unused terminals. Please contact technical sales for details.
Note4: Insulation resistance
Insulation resistance will reduce at higher temperatures. For more information on temperature effects click here, or
contact Pickering for more in depth guidance.

Washing Guidelines
Pickering do not make any specific recommendations on washing reed relays, due to the large number of factors in cleaning
processes, however we do have suggestions on best practices. Click here for more information.
The technical information shown in this data sheet could contain inaccuracies or typographical errors. This information may
be periodically changed or updated and these changes will be included in future versions of this data sheet.
For different values, latest specifications and product details, please contact your local Pickering sales office.

For FREE evaluation samples go to: pickeringrelay.com/samples

3

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Specification

High Power & High Voltage SIL/SIP Reed Relays – Series 144

Pin Configuration, Weights and Dimensional Data (dimensions in inches, millimeters in brackets)

Weight:Typical
2.06
Weight:Typical
2.06
gg

0.245 (6.22)

0.95 (24.1)

PackageType 1 1
PackageType

1 Form A

0.32
(8.1)

+

0.02
(0.5)
1

0.125
(3.2)

Pin 1
0.2
(5.1)

0.2
(5.1)

5

7

Switch No. 2 (2 kV stand-off)

0.01(0.25)

0.245 (6.22)

0.95 (24.1)

Package
Type
PackageType 22Weight:Typical2.06g gWeight:Typical
2.06

0.2
(5.1)

0.02
(0.5)

3

1 Form A
0.32
(8.1)

0.02
(0.5)

+
1

3

5

7

Switch No. 3 (3 kV stand-off)

0.125
(3.2)
Pin 1

0.3
(7.6)

0.2
(5.1)

0.02
(0.5)

0.3
(7.6)

Additional Build Options:Switch No. 2 (2 kV stand-off)

0.245 (6.22)

1.14 (29.0)

Package
Type
PackageType 3 3

0.01(0.25)

Weight:Typical
3.75
Weight:Typical
3.75
gg

1 Form B(see Note)

0.49(12.5)

0.02
(0.5)

+
1

3

5

7

Switch No. 2 (2 kV stand-off)

0.125
(3.2)
Pin 1

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.02
(0.5)

0.01
(0.25)

0.245 (6.22)

1.14 (29.0)

Package
Type
PackageType 4 4
Weight:Typical
3.70
Weight:Typical
3.70
gg

2 Form A+

0.49(12.5)

0.02
(0.5)

1

2

3

4

5

6

Switch No. 2 (2 kV stand-off)

0.125
(3.2)
Pin 1

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.2
(5.1)

0.02
(0.5)

0.2
(5.1)

0.01
(0.25)

Important: Where the optional internal diode is fitted or for all Form B types, the correct coil polarity must be observed, as
shown by the + symbol on the schematics.

6 mm

4

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Specification

High Power & High Voltage SIL/SIP Reed Relays – Series 144

Similar Relays Comparison
If the Series 144 is unsuitable for your application, Pickering also manufactures five other series of reed relays with similar
characteristics, but in different package sizes.
Series Name131-1-A

119-1-A

119-2-A

119-1-B

104-1-A & 104HT-1-A

104ES-1-A

Physical Outline

Depth
Width
Heightmm(inches)

3.7 (0.145)
12.5 (0.49)

3.7 (0.145)
15.1 (0.595)

6.6 (0.26)

6.3 (0.245)

20.1 (0.79)

6.6 (0.26)

15.1 (0.595)

24.1 (0.95)

8.9 (0.35)

8.9 (0.35)

8.2 (0.32)

Package Volume
(mm3)

306

369

491

662

498

1245

1245

1245

1245

Typical Weights (g)

0.58

0.67

0.74

1.06

0.89

2.06

2.06

2.06

1.94

Contact
Configuration

1-A(SPST)

2-A(DPST)

1-B(SPNC)

Reed Switch Type

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Stand-off Voltage (V)

1500

1500

2000

3000

1500

1500

2000

Switching Voltage (V)

1000

1-A
(SPST)

1-A(SPST)1000

1-A(SPST)

Mercury
Wetted

Dry

Dry

Dry

Dry

Dry

Dry

1500 2000

1500

3000

4000

5000

1500

2000

3000

1000

500

1000

1000

1000

Dry

1000 (1500)

Switching Current (A)

0.7

0.7

1

2

1

1

1

1

Carry Current (A)

1.25

1.25

1.5

3

1.5

1.5

1.5

1.5

Switch Power (W)

10

10

25

50

25 (3)

25

25

25

Series Name

104-1-B

104-2-A

144-1-A

144-1-B

144-2-A

6.3 (0.245)

6.3 (0.245)

6.3 (0.245)

6.3 (0.245)

29 (1.14)

24.1 (0.95)

29.0 (1.14)

29.0 (1.14)

12.5 (0.49)

8.2 (0.32)

12.5 (0.49)

12.5 (0.49)

Physical Outline

Depth
Width
Heightmm(inches)

Package Volume
(mm3)

1

2

3

4

2284

2284

1245

1245

2284

2284

Typical Weights (g)

3.75

3.70

2.06

2.06

3.75

3.70

Contact
Configuration

1-B(SPNC)

2-A(DPST)

1-A(SPST)

1-A(SPST)

1-B(SPNC)

2-A(DPST)

Reed Switch Type

Dry

Dry

Dry

Dry

Mercury
Wetted

Dry

Dry

Dry

Dry

Stand-off Voltage (V)

1500

2000

1500

2000

1500

2000

3000

2000

2000

1000

500

1000 (250)1000 (250)1000 (250)1000 (250)

Switching Voltage (V)1000

Switching Current (A)

1

1

2

2 (1 / 0.01)

2 (1 / 0.01)

2 (1 / 0.01)

Carry Current (A)

1.5

1.5

3

3

3

3

Switch Power (W)

25

25

50

80 (60 / 10)

80 (60 / 10)

80 (60 / 10)

5pickeringrelay.com

Specification

High Power & High Voltage SIL/SIP Reed Relays – Series 144

Series Name

100HV-1-A

100HV-1-B

100HV-2-A

10.2 (0.40)

10.2 (0.40)

10.2 (0.40)

24.1 (0.95)

29 (1.14)

29 (1.14)

12.7 (0.50)

15.2 (0.60)

15.2 (0.60)

4496

4496

Physical Outline

Depth
Width
Heightmm(inches)

Package Volume
(mm3)

3122

3122

Typical Weights (g)

6.99

8.75

8.75

Contact
Configuration

1-A(SPST)

1-B(SPNC)

2-A(DPST)

Reed Switch Type

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Stand-off Voltage (V)

1500

2000

3000

1500

2000

1500

2000

Switching Voltage (V)

1000

1000

1000

Switching Current (A)

1

1

1

Carry Current (A)

1.5

1.5

1.5

Switch Power (W)

25

25

25

Series Name

219-1-A

219-2-A

219-1-B

Physical Outline
Depth
Width
Height10.5 (0.42) Body, 15.5 (0.61) Across Legs

mm(inches)17.2 (0.677)
8.5 (0.34)

Package Volume
(mm3)

1535

1535

1535

Typical Weights (g)

2.12

2.39

2.19

Contact
Configuration

1-A(SPST)

2-A(DPST)

1-B(SPNC)

Reed Switch Type

Dry

Dry

Dry

Dry

Dry

Dry

Stand-off Voltage (V)

1500

2000

3000

1500

1500

2000

Switching Voltage (V)1000

Switching Current (A)0.7

Carry Current (A)

1.25

Switch Power (W)10

Reed Relay Selection Tool
Because Pickering offer the largest range of high-quality reed relays, sometimes it can be difficult to find the right reed relay
you require. That is why we created the Reed Relay Selector, this tool will help you narrow down our offering to get you thecorrect reed relay for your application. To try the tool today go to: pickeringrelay.com/reed-relay-selector-tool6

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Ordering Information

High Power & High Voltage SIL/SIP Reed Relays – Series 144

Standard Build Options
The Series 144 Reed Relays are available with a number of standard build options to tailor them to your specific application.
These options are detailed in the table below. If you decide to go ahead and specify one, or more, of these options you willbe allocated a unique part number suffix.
Mechanical Build Options

Electrical Build Options

Special pin configurations or pin lengths

Different coil resistanceSpecial print with customer’s own part number or logo

Different stand-off or switching voltage

Custom packaging possibility

Operate or de-operate time

Equivalents to competitors discontinued parts

Pulse capability
Enhanced specifications
Equivalents to competitors discontinued parts
Non-standard coil voltages and resistance figures
Special Life testing under customer’s specific loadconditions
Specific environmental requirements
Controlled thermal EMF possibility

Customization
If your specific requirements are not met by standard relay, or any of the standard build options, please speak to us todiscuss producing a customized reed relay to service your specific application: pickeringrelay.com/contact

3D ModelsInteractive 3D models of the complete range of Pickering relay products in STEP, IGS and SLDPRT formats can be
downloaded from the website: pickeringrelay.com/3d-models

Part Number Description:  144 - 1 - A - 5 / 2 D - xxx

SeriesNumber of reeds
Switch form
Coil voltage
Switch number (see tables on pages 2 & 3)
Diode if fitted (omit if not required)
Unique suffix (if standard build option selected)

Help
If you need any technical advice or other help, please do not hesitate to contact our Technical Sales Department. We will
always be pleased to discuss Pickering relays with you. email: techsales@pickeringrelay.com

Contact Usyyo n g v iteL7o n g v ite

L

UK Headquarters - email: sales@pickeringrelay.com | Tel. +44 1255 428141
USA - email: ussales@pickeringrelay.com | Tel. +1 781 897 1710
Germany - email: desales@pickeringtest.com | Tel. +49 89 125 953 160
France - email: frsales@pickeringtest.com | Tel. +33 9 72 58 77 00
Nordic - email: ndsales@pickeringtest.com | Tel. +46 340 69 06 69
Czech Republic: czsales@pickeringtest.com | Tel. +420 558-987-613
China - email: chinasales@pickeringtest.com | Tel. +86 4008 799 765
For a full list of agents, distributors and representatives visit: pickeringrelay.com/agents

100%
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High Power & High Voltage SIL/SIP Reed Relays – Series 144

10 Key Benefits of Pickering Reed Relays
Pickering Reed Relays

Typical Industry Reed Relays

1
Instrumentation Grade
Reed Switches

Instrumentation Grade Reed Switcheswith vacuum sputtered Ruthenium
plating to ensure stable, long life up to
5x10E9 operations.

Often low grade Reed Switches withelectroplated Rhodium plating resulting
in higher, less stable contact resistance.

22
Formerless CoilConstruction

Formerless coil construction increases
the coil winding volume, maximizing
magnetic efficiency, allowing the use ofless sensitive reed switches resulting in
optimal switching action and extended
lifetime at operational extremes.

Use of bobbins decreases the coilwinding volume, resulting in having
less magnetic drive and a need to use
more sensitive reed switches which
are inherently less stable with greatly
reduced restoring forces.

3
Magnetic Screening

Mu-metal magnetic screening (either
external or internal), enables ultra-high
PCB side-by-side packing densities withminimal magnetic interaction, saving
significant cost and space. Pickering
Mu-Metal magnetic screen - interaction
approx. 5%

Lower cost reed relays have minimal
or no magnetic screening, resulting inmagnetic interaction issues causingchanges in operating and releasevoltages, timing and contact resistance,
causing switches to not operate at theirnominal voltages. Typical industry
screen - interaction approx. 30%

4SoftCenter™ technology, provides
maximum cushioned protection of thereed switch, minimising internal lifetimestresses and extending the working lifeand contact stability.

Transfer moulded reed relays (produced
using high temperature/pressure),
result in significant stresses to the glass
reed switch which can cause the switch
blades to deflect or misalign leading tochanges in the operating characteristics,
contact resistance stability and operating
lifetime.

100% testing for all operating
parameters including dynamic contact
wave-shape analysis with full data
scrutiny to maintain consistency.

Simple dc testing or just batch testing
which may result in non-operational
devices being supplied.

SoftCenter™
Technology

5100% Dynamic
Testing

X-Ray of Pickering
mu-metalmagnetic screen

X-Ray of typicalindustrymagnetic screen

Dynamic Contact Resistance Test
OperateContact Resistance

Key Benefit

Release6
100% Inspection
at Every Stage of
Manufacturing

7

Inspection at every stage ofmanufacturing maintaining high levelsof quality.

Often limited batch inspection.

Stress testing of the manufacturing
processes, from -20 °C to +85 °C to-20 °C, repeated 3 times.

Rarely included resulting in field failures.

+85°C

100% Thermal
Cycling-20°C

Product Longevity

Limited ability to customize.

Pickering are committed to productlongevity; our reed relays are
manufactured and supported formore than 25 years from introduction,
typically much longer.

Most other manufacturers discontinueparts when they reach a low sales
threshold; costing purchasing and R&D
a great deal of unnecessary time andmoney to redesign and maintain supply.

o n g v iteo n g v itey

Our reed relays can be customized
easily, e.g. special pin configurations,enhanced specifications, non-standard
coil or resistance figures, special life
testing, low capacitance, and more.

L

10

Mass production: Usually large
batch sizes and with no quick-turn
manufacturing.

L

9
Custom Reed Relays

Flexible manufacturing processes allow
quick-turn manufacturing of small
batches.

y8Flexible
Manufacturing
Process

Product

25+YearsLongevity

For more information go to: pickeringrelay.com/10-key-benefits
8

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Pickering Electronics maintains a commitment to continuous product development, consequently we reserve the right to vary from the description given in this data sheet.

Coil Voltage