A1421LK-T Allegro Microsystems Inc, A1421LK-T Datasheet - Page 5

• Manufacturer Part Number: A1421LK-T
• Description: IC,HALL-EFFECT SENSOR,SINGLE-ENDED,SIP,4PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of A1421LK-T

• Rohs Compliant: YES
• Sensing Range: 27.5G Trip, -12.5G Release
• Voltage - Supply: 4 V ~ 26.5 V
• Current - Supply: 7mA
• Current - Output (max): 25mA
• Output Type: Digital, Open Collector
• Features: High Precision
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Magnetic Type: Monolithic
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 12V
• Operating Supply Voltage (max): 26.5V
• Output Current: 25mA
• Mag Sensor Operate Point (g): 27.5Gs
• Mag Sensor Release Point (g): -12.5Gs
• Mag Sensor Hysteresis(g): 15Gs
• Package Type: SIP
• Pin Count: 4
• Mounting: Through Hole
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A1421, A1422,
and
Defi nitions of Terms
The following provide additional information about some of the
parameters cited. For additional information, visit the Allegro
Web site at www.allegromicro.com.
Applied Magnetic Field, B
density, which is calculated as the arithmetic difference of the
flux densities observed by each of the two Hall elements. f
the input signal frequency.
Output Off Switchpoint (Operate Point), B
increasing differential magnetic flux density at which the device
output switches from low to high (A1421) or high to low (A1422
and A1423).
Output On Switchpoint (Release Point), B
decreasing differential magnetic flux density at which the device
output switches from high to low (A1421) or from low to high
(A1422 and A1423).
Power-On Time, t
THERMAL CHARACTERISTICS
*In still air. Additional thermal information available on Allegro Web site.
Package Thermal Resistance
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
A1423
20
Characteristic
40
T
J(max)
PO
60
Power Derating Curve
– The time needed by the device, after
Minimum-K PCB
(R
JA
= 165°C; I
80
= 177 ºC/W)
diff
100
– The differential magnetic flux
CC
120
may require derating at maximum conditions, see application information
Symbol
= I
High Precision Hall Effect AC-Coupled Differential
R
CC(max)
RP
140
OP
θJA
– The value of
– The value of
160
Minimum-K PCB (single-sided with copper limited to solder pads)
180
V
V
Sensor IC with Integrated Filter Capacitor
CC(max)
CC(min)
Bdiff
is
power is applied, to initialize all circuitry necessary for proper
operation.
Settling Time, t
t
provide proper output transitions. Settling time is a function of
magnetic offset, offset polarity, signal phase, signal frequency,
and signal amplitude.
Supply Current (on), I
with the output transitor is turned on.
Supply Current (off), I
with the output transitor is turned off.
Response Time, t
zero-crossing output transitions after initialization (the sum of
Power-on Time and Settling Time).
PO
, and after a valid magnetic signal has been applied, to
Test Conditions*
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
T
20
J(max)
40
= 165°C; I
Settling
Maximum Power Dissipation
Response
60
– The time required by the device, after
CC(on)
CC(off)
– The total time required for generating
CC
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Temperature (°C)
80
– The current draw of the device
– The current draw of the device
= I
CC(max)
100
120
; V
CC
140
= V
Value
CC(max)
177
160
Units
180
ºC/W
5