A3425LK-T Allegro Microsystems Inc, A3425LK-T Datasheet - Page 2

• 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

Features and Benefits
▪ Two matched Hall effect switches on a single substrate
▪ Hall element spacing approximately 1 mm
▪ Superior temperature stability
▪ 3.3 to 18 V operation
▪ Integrated ESD diode from OUTPUT and VCC pins
▪ High-sensitivity switchpoints
▪ Robust structure for EMC protection
▪ Solid-state reliability
Package: 8 pin SOIC (suffix L), and 4 pin
SIP (suffix K)
Not to scale
A3425DS-Rev. 13
to GND
V
Supply
Ultra-Sensitive Dual-Channel Quadrature
Typical Application
Using unregulated supply
100 Ω
Description
The A3425 is a dual–output-channel, bipolar switch with each
channel comprising a separate complete Hall-effect circuit with
dedicated Hall element and separate digital output for speed
and direction signal processing capability. The independent
Hall elements (E1 integrated with
with
than 1 μm. Maintaining this accurate mechanical location
between the two active Hall elements eliminates the major
manufacturing hurdle encountered in fine-pitch detection
applications. The A3425 is a highly sensitive, temperature-stable
magnetic device, which is ideal for use in ring magnet-based
speed and direction sensing systems used in harsh automotive
and industrial environments.
The A3425 contains two independent Hall effect switches, and
has a monolithic IC that accurately locates the two Hall elements,
E1 and E2, approximately 1 mm apart. The digital outputs are
90º out of phase so that the outputs are in quadrature, with the
proper ring magnet design. This allows for easy processing of
speed and direction signals. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
Continued on the next page…
OUTPUTB
Hall-Effect Bipolar Switch
0.1 uF
1
VCC
) are photolithographically aligned to better
A3425
OUTPUTA
GND
2
4
OUTPUTB
3
OUTPUTA
V
V
OUTPUTB
OUTPUTA
, and E2 integrated
A3425