A3250LLT-T Allegro Microsystems Inc, A3250LLT-T Datasheet - Page 2

• Manufacturer Part Number: A3250LLT-T
• Description: IC SW HALL EFFECT UNI SOT-89
• Manufacturer: Allegro Microsystems Inc
• Type: Unipolar Switchr

Specifications of A3250LLT-T

• Sensing Range: 50G
• Voltage - Supply: 4.2 V ~ 24 V
• Current - Supply: 10mA
• Current - Output (max): 20mA
• Output Type: Digital, Open Collector
• Features: Regulated Voltage
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-89-3
• Magnetic Type: Unipolar
• Operating Supply Voltage (min): 4.2V
• Operating Supply Voltage (typ): 5/9/12/15/18V
• Operating Supply Voltage (max): 24V
• Output Current: 20mA
• Mag Sensor Operate Point (g): 50Gs
• Mag Sensor Hysteresis(g): 13Gs
• Package Type: SOT-89
• Pin Count: 3 +Tab
• Mounting: Surface Mount
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Features and Benefits
▪ Chopper stabilization for stable switchpoints throughout
▪ Externally programmable operate point (through VCC pin)
▪ On-board voltage regulator for 4.2 V to 24 V operation
▪ On-chip protection against:
Package: 3-pin SOT89 (suffix LT) and
3-pin SIP (suffix UA)
Not to scale
3250-DS Rev. 11
operating temperature range
▫ Supply transients
▫ Output short-circuits
▫ Reverse-battery condition
VCC
Amp
Field-Programmable, Chopper-Stabilized
Functional Block Diagram
Program/Lock
Programming
Logic
Low-Pass
Filter
Offset Adjust
Unipolar Hall-Effect Switches
Description
The A3250 and A3251 are field-programmable, chopper-
stabilized, unipolar Hall-effect switches designed for use in
high-temperature applications. These devices use a chop-
per-stabilization technique to eliminate offset inherent in
single-element devices.
The A3250 and A3251 are externally programmable
devices. The devices have a wide range of programmabil-
ity of the magnetic operate point (B
remains fixed. This advanced feature allows for optimiza-
tion of the device switchpoint and can drastically reduce
the effects of variations found in a production environment,
such as magnet and device placement tolerances.
These devices provide on-chip transient protection. A Zener
clamp on the power supply protects against overvoltage
conditions on the supply line. These devices also include
short-circuit protection on the output.
The output of the A3250 switches LOW when subjected
to a south-polarity magnetic field with a flux density that
exceeds the threshold for B
field drops below the magnetic release point, B
put of the A3251 has the opposite polarity, switching HIGH
in a south-polarity magnetic field that B
LOW when the field drops below B
Continued on the next page…
Current Limit
Regulator
A3250 and A3251
OP
GND
, and switches HIGH when the
OP
RP
) while the hysteresis
.
VOUT
OP
, and switching
RP
. The out-