CH941

DESCRIPTION

The CH941S, CH941E and CH941T are small, versatile digital Hall-effect devices that are operated by the 

magnetic field from a permanent magnet or an electromagnet.

This unipolar sensors are designed to meet the requirements of a wide range of potential applications. These 

economical unipolar sensors are well suited for simple, high-volume, cost-sensitive position and motion sensing 

applications.

The 3.3Vdc to 60 Vdc supply voltage range allows this device to be used in very wide voltage applications. 

These sensors are available in two package styles: the CH941S in the subminiature SOT-23-3L surface mount 

package, the CH941E in the subminiature SOT-89-3L surface mount package, the CH941T is available in the 

leaded, flat TO-92-style package.

The CH941S and CH941E are available on tape and reel (CH941S 3000 units per reel, CH941E 1000 units per 

reel), the CH941T is available in a bulk package (1000 units per bag).

APPLICATIONS

Commercial: 

-Door or lid closure detection i n 

appliances

-Speed and RPM sensing in 

fitness equipment 

-Flow rate sensing in appliances 

and water softeners 

-Damper or valve position control 

in HVAC equipment

-Printer head position sensing

Industrial 

-Flow rate sensing in industrial 

processes 

-Robotic control (cylinder position 

monitoring)

-Float-based fluid level sensing

Medical 

-Displacement sensor in hospital 

beds and medical equipment

-Medication bin monitor on 

portable drug carts

FEATURES

• Unipolar respond to a single pole: North (CH941S) or South 

(CH941T and CH941E), making these products well-suited for 

shift selectors, wiper end/home position, door ajar/open, and 

vane-interrupt systems etc.

• Enhanced sensitivity: will operate from Brp 110 Gauss to Bop 

150 Gauss typical with very good temperature-stable and stressresistant, allowing the use of smaller, potentially lower-cost 

magnets or high robust application

• Subminiature, SOT-23-3L(CH941S) or SOT-89-3L(CH941E) 

surface mount package supplied on tape and reel allows for a 

compact design with automated component placement, helping 

to reduce manufacturing costs

• Small, leaded, flat, TO-92S package (CH941T) allows for a 

compact PCB layout

• Wide operating voltage range of 3.3V to 60V makes these 

sensors useable in a wide range of applications

• Built-in reverse voltage capability enhances the protection of the 

sensor and the circuits with which it is used

• Robust design: will operate up to 150 °C

• RoHS-compliant material meets directive 2002/95