Hall ICs

DN8799MS

3

s Caution on use of Hall ICs

As the Hall IC is often used to detect movement, the position of a Hall IC may be changed, and there is the risk of

a change in detection level, if exposed to shock or vibration over a long period of time. Secure the IC by applying

adhesive to the package or placing in a dedicated case.

1. On mounting of the surface mount type (MINI-3D package)

When mounted on the printed circuit board, the Hall IC may be highly stressed by the warping that may occur from

soldering. This may also cause a change in the operating flux density characteristic and a deterioration of its resistance

to moisture.

2. On using flux in soldering

Choose a flux which does not include ingredients from halogen group, such as chlorine, fluorine, etc. The

ingredients of halogen group may enter where the lead frame and package resin joint, causing corrosion and the

disconnection of the aluminum wiring on the surface of an IC chip.

3. On fixing a Hall IC with the holder

When a Hall IC is mounted on the printed circuit board with a holder and the coefficient of expansion of the holder

is large, the lead wire of the Hall IC will be stretched and it may give a stress to the Hall IC.

If the lead wire is stressed intensely due to the distortion of holder or board, the adhesives between the package and

the lead wire may be weakened and cause a minute gap resulting in the deterioration of its resistance to moisture.

Sensitivity may also be changed by this stress.

4. Power supply line/power transmission line

If a power supply line/power transmission line becomes longer, noise and/or oscillation may be found on the line.

In this case, set the capacitor of 0.1

µF to 10 µF near a Hall IC to prevent it.

If a voltage of 18 V or more is thought to be applied to the power supply line (flyback voltage from coil or the ignition

pulse, etc.), avoid it with external components (capacitor, resistor, Zener diode, diode, surge absorbing elements, etc.).

IC GND-pin voltage is set higher than other pin voltage, the IC configuration will become same as a forward biased

diode. Therefore, it will turn on at the diode forward voltage (approximately 0.7 V), and a large current will flow through

the IC, ending up in its destruction. (This is common to Monolithic IC.)

6. Cautions on power ON of Hall IC

When a Hall IC is turned ON, the position of the magnet or looseness may change the output of a Hall IC, and a

pulse may be generated. Therefore, care should be given whenever the output state of a Hall IC is critical when the

supply power is ON.