ATS642LSHTN-I2-T Allegro Microsystems Inc, ATS642LSHTN-I2-T Datasheet - Page 14

• Manufacturer Part Number: ATS642LSHTN-I2-T
• Description: IC SENSOR GEAR TOOTH 4-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS642LSHTN-I2-T

• Output Type: Digital, Open Collector
• Sensing Range: 120mV Trip, 120mV Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 8.4mA
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Termination Type: Through Hole
• Bandwidth: 40kHz
• Current Rating: 16.8mA
• Operate Point Max: 1000G
• Supply Voltage Max: 24V
• Leaded Process Compatible: Yes
• No. Of Pins: 4
• Hall Effect Type: Gear Tooth
• Supply Voltage Min: 4V
• Rohs Compliant: Yes
• Filter Terminals: Through Hole
• Operate Point Min: 30G
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ATS642LSH
The device must be operated below the maximum junction
temperature of the device, T
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating T
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, R
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, R
relatively small component of R
T
overmolding.
The effect of varying power levels (Power Dissipation, P
be estimated. The following formulas represent the fundamental
relationships used to estimate T

For example, given common conditions such as: T
V

A worst-case estimate, P
able power level (V
at a selected R
A
CC
, and air motion are significant external factors, damped by
T = P
= 12 V, I
T = P
CC
P
JA
D
= 4 mA, and R
= V
T
and T
J
D
P
T
CC(max)
= T
D
J
×
CC
= T
= V
R
A
A
×
D(max)
.
JA
+ T = 25°C + 7°C = 32°C
A
D
IN
, I
I
+ ΔT
CC
×
J(max)
J
= 48 mW
CC(max)
×
. (Thermal data is also available on
R
, represents the maximum allow-
= 12 V
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
I
JA
J
JA
JA
, at P
IN
. Under certain combinations of
= 140 °C/W, then:
. Ambient air temperature,
), without exceeding T
JA
D
×
×
.
, is a figure of merit sum-
4 mA = 48 mW
140 °C/W = 7°C
A
= 25°C,
Two-Wire True Zero Speed Miniature Differential
Power Derating
JC
D
), can
J(max)
(1)
(2)
(3)
, is
,
Example: Reliability for V
(I1 trim), using minimum-K PCB
Observe the worst-case ratings for the device, specifically:
R
I
Calculate the maximum allowable power level, P
invert equation 3:
This provides the allowable increase to T
power dissipation. Then, invert equation 2:
Finally, invert equation 1 with respect to voltage:
The result indicates that, at T
dissipate adequate amounts of heat at voltages ≤V
Compare V
able operation between V
R
V
CC(max)
JA
JA
CC(max)
V
T
CC(est)
. If V
= 126°C/W, T
P
max
= 16 mA.
D(max)
is reliable under these conditions.
= T
= P
CC(est)
CC(est)
J(max)
D(max)
= T
≥ V
to V
J(max)
– T
÷ I
max
CC(max)
CC(max)
A
CC(max)
= 165°C, V
÷ R
= 165 °C – 150 °C = 15 °C
CC(est)
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
CC
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
JA
, then operation between V
A
. If V
at T
= 119 mW ÷ 16 mA = 7 V
, the application and device can
= 15°C ÷ 126 °C/W = 119 mW
and V
A
CC(est)
= 150°C, package SH
CC(max)
CC(max)
J
≤ V
= 24 V, and
resulting from internal
CC(max)
requires enhanced
D(max)
CC(est)
, then reli-
CC(est)
. First,
.
and
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