CH424/N

DESCRIPTION

The CH424 and CH424N are small, versatile digital Hall effect devices that are operated by the 

magnetic field from a permanent magnet or an electromagnet, designed to respond to alternating North 

and South poles.

These bipolar latching sensor ICs have enhanced sensitivity, which often allows for the use of less 

expensive magnets.

These sensor ICs are available in three package styles, the CH424S/CH424NS in the subminiature 

SOT-23-3L surface mount package, the CH424E/CH424NE in the subminiature SOT-89-3L surface mount 

package, and the CH424T/CH424NT in the leaded, flat TO-92S package.

The CH424S/CH424NS’s and CH424E/CH424NE’s small size requires less PC board space, allowing it 

to be used in smaller assemblies. Its 3.3V capability allows for use in low voltage applications, promoting 

energy efficiency.

The CH424S/CH424NS and CH424E/CH424NE are available on tape and reel; the CH424T/CH424NT

is available in a bulk package (1000 units per bag).

APPLICATIONS

Transportation

- Speed and RPM 

(revolutions per minute) 

sensing

- Tachometer, counter pickup

- Motor and fan control

- Electric window lift

- Convertible roof position

- Automotive transmission 

position

Industrial

- Speed and RPM sensing

- Tachometer, counter pickup

- Flow-rate sensing

- Brushless dc (direct 

current) motor commutation

- Motor and fan control

- Robotics control

Medical

- Motor assemblies

- Medication dispense control

FEATURES

· Enhanced sensitivity: will operate from only 30 Gauss typical, 

at 25°C allowing the use of smaller, potentially lower-cost 

magnets or wider air gaps

· Subminiature, SOT-23-3L(CH424S/CH424NS) or SOT-89-

3L(CH424E/CH424NE) 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 (CH424T/CH424NT) 

allows for a compact PCB layout

· Bipolar latching magnetics respond to alternating North and 

South poles, making these products well-suited for accurate 

speed sensing and RPM (revolutions per minute) 

measurement

· Wide operating voltage range of 3.3V to 30V 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 2011/65/EU