A3425LK-T Allegro Microsystems Inc, A3425LK-T Datasheet - Page 10

• Manufacturer Part Number: A3425LK-T
• Description: Hall Effect Switch IC
• Manufacturer: Allegro Microsystems Inc
• Type: Bipolar Latchr

Specifications of A3425LK-T

• Peak Reflow Compatible (260 C): Yes
• Output Current: 70mA
• Termination Type: Through Hole
• Supply Voltage Max: 18V
• Leaded Process Compatible: Yes
• No. Of Pins: 4
• Hall Effect Type: Bipolar
• Supply Voltage Min: 3.3V
• Sensing Range: 35G Trip, -35G Release
• Voltage - Supply: 3.3 V ~ 18 V
• Current - Supply: 6mA
• Current - Output (max): 20mA
• Output Type: Digital, Open Drain
• Features: Ultra Sensitive
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A3425
This device requires minimal protection circuitry
during operation with a low-voltage regulated line.
The on-chip voltage regulator provides immunity
to power supply variations between 3.3 and 18 V.
Because the device has open-drain outputs, pull-up
resistors must be included.
If protection against coupled and injected noise is
required, then a simple low-pass fi lter on the supply
(RC) and a fi ltering capacitor on each of the outputs
may also be needed, as shown in the unregulated
supply diagram.
For applications in which the device receives its power
from unregulated sources, such as a car battery, full
V
Supply
Regulated supply
Unregulated supply
V
Supply
Typical Applications Circuits
Ultra-Sensitive Dual-Channel Quadrature
100 Ω
0.1 uF
protection is generally required to protect the device
against supply-side transients. Specifi cations for such
transients vary for each application, so the design of
the protection circuit should be optimized for each
application.
For example, the circuit shown in the unregulated
supply diagram includes a Zener diode that offers high
voltage load-dump protection and noise fi ltering by
means of a series resistor and capacitor. In addition, it
includes a series diode that protects against high-volt-
age reverse battery conditions.
1
VCC
A3425
OUTPUTA
GND
0.1 uF
2
4
Hall-Effect Bipolar Switch
OUTPUTB
1
VCC
3
A3425
OUTPUTA
GND
2
4
OUTPUTB
V
V
OUTPUTB
OUTPUTA
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
3
V
V
OUTPUTB
OUTPUTA
9