Reed Sensors Datasheet
© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 05/09/23
1
59156 Series
Subminiature Flange Mount Sensor
2.20x2.50 Typ.
Slot (.087x.098)
(.075)
9.00
(.354)
1.90
5.00
(.197)
3.00
(.118)
(.276)
7.00
(.315)
8.00
(.500)
12.70
Actuator
(sold separately)
(.197)
(.354)
(.071)
(.118)
(Excluding Encapsulant)
(.276)
(.315)
12.70
(.500)
8.00
7.00
3.00
1.80
5.00
9.00
Slot (.087x.098)
2.20x2.50 Typ.
Sensor (Two-wire version)
Actuator
Sensor
Description
Agency Approvals
Agency Agency File Number
E61760
Note: Contact Littelfuse for specific agency approval ratings.
The 59156 is a subminiature flange mounting reed sensor
12.70mm x 9.00mm x 3.00mm ( 0.500’’ x 0.354’’ x 0.118’’) with
normally open contacts. The case design enables mounting with
non-magnetic M2 screw at 0.1 Nm torque maximum or adhesive
mounting. The wires exit from the left-hand side, see Drawing 2.
It is also available with right-hand exit, see 59155 series.
The 59156 is capable of switching up to 120Vac/170Vdc at 10VA.
It is well suited for use in a wide range of industrial, appliances, or
IoT proximity sensing applications.
The 59156 series functions best with the matching actuator
57155-000.
Features and Benefits
■ Smallest flange mount type
reed sensor in the market
■ Non-contact switching
solution for wet & harsh
environments
■ Housing design for optimum
adjustability
■ Available in select sensitivities
(operating distances)
■ Standard cable
configurations; customization
options available
■ No leakage current in ‘open’
state−ideal for battery
powered IoT applications
■ Can operate through
non-ferrous materials (for
example, wood, plastic or
aluminium)
■ Helps implement efficient
proximity/access and energy
management systems
■ Easy installation and effective
concealment in many
applications
■ UL Recognized per UL 508
and CSA C22.2 No. 14
■ Hermetically sealed, IP67
rated; REACH compliant
Applications
■ Security and access control
■ Factory automation
■ Process equipment
■ Major appliances
■ Small appliances
■ Proximity and limit sensing
Dimensions
Dimensions in mm (inch)
Tolerances are +/- 0.25 (0.010) unless otherwise noted.
Schematics Switch Type
Black
Black
1
Reed Sensors Datasheet
© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 05/09/23
2
59156 Series
Subminiature Flange Mount Sensor
D
Actuator
Sensor
Electrical Ratings
Contact Type Normally Open
Switch Type 1
Contact Rating
1
VA/Watt - max. 10
Voltage
4
Switching
2
Breakdown
3
Vdc - max.
Vac - max.
Vdc - min.
170
120
175
Current
4
Switching
2
Carry
Adc - max.
Aac - max.
Adc - max.
0.25
0.18
0.5
Resistance
5
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.15
10
12
Capacitance Contact pF - typ. 0.3
Temperature Operating °C -40 to +105
Product Characteristics
Operate Time
6
ms - max. 0.5
Release Time
6
ms - max. 0.2
Shock
7
11ms ½ sine G - max. 100
Vibration
7
50-2000 Hz G - max. 30
Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information.
2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Breakdown Voltage - per MIL-STD-202, Method 301.
4. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.
5. This resistance value is for 300 mm wire length. Resistance changes when wire lengthens.
6. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A, diode suppressed coil (Coil II).
7. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
8. For custom modifications to the wire length or size, or adding a special connector, please contact Littelfuse.
Sensitivity Options (Using 57155 Actuator)
Select Option S T
Switch Type
Pull-In AT
Range
Activation Distance
(mm)
Deactivation Distance
(mm)
Pull-In AT
Range
Activation Distance
(mm)
Deactivation Distance
(mm)
1 Normally Open 6-10 2.0-4.2 2.2-4.7 10-15 1.5-4.0 1.8-4.4
Notes:
1. Pull-In AT Range: These AT values are the bare reed switch AT before modification.
2. The activation distance is average value on the final sensor assembly.