A3241EUA-T Allegro Microsystems Inc, A3241EUA-T Datasheet - Page 10
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A3241EUA-T
Manufacturer Part Number
A3241EUA-T
Description
IC SWITCH HALL EFFECT 3-SIP
Manufacturer
Allegro Microsystems Inc
Type
Unipolar Switchr
Specifications of A3241EUA-T
Sensing Range
135G Trip, 40G Release
Voltage - Supply
3.6 V ~ 24 V
Current - Supply
3.5mA
Output Type
Digital, Open Drain
Features
Regulated Voltage
Operating Temperature
-40°C ~ 85°C
Package / Case
3-SIP
Magnetic Type
Unipolar
Operating Supply Voltage (min)
3.6V
Operating Supply Voltage (typ)
5/9/12/15/18V
Operating Supply Voltage (max)
24V
Mag Sensor Operate Point (g)
135Gs
Mag Sensor Release Point (g)
40Gs
Mag Sensor Hysteresis(g)
25Gs
Package Type
Ultra Mini SIP
Pin Count
3
Mounting
Through Hole
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output (max)
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
A3241
A3242
Power Derating
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
V
A worst-case estimate, P
able power level (V
at a selected R
For example, given common conditions such as: T
A
CC
, and air motion are signifi cant external factors, damped by
T = P
T = P
= 12 V, I
P
T
D
J
= T
= V
A
D
CC
+ T = 25°C + 3°C = 28°C
and
×
CC
JA
×
R
= 1.5 mA, and R
I
JA
and T
CC
P
T
CC(max)
D
J
= 12 V
= 18 mW
= T
= V
A
D(max)
.
A
D
IN
, I
+ ΔT
×
J(max)
J
×
CC(max)
×
. (Thermal data is also available on
R
, represents the maximum allow-
×
1.5 mA = 18 mW
I
J
JA
JA
, at P
IN
. Under certain combinations of
JA
165 °C/W = 3°C
Chopper-Stabilized Unipolar Hall Effect Switches
. Ambient air temperature,
), without exceeding T
(2)
JA
= 165 °C/W, then:
D
.
, is a fi gure of merit sum-
(1)
(3)
A
= 25°C,
JC
D
), can
J(max)
, is
,
Example: Reliability for V
low-K PCB.
Observe the worst-case ratings for the device, specifi cally:
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:
P
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
D(max)
CC(est)
. If V
= 228 °C/W, T
max
= 5 mA.
is reliable under these conditions.
= T
= T
= P
CC(est)
CC(est)
J(max)
D(max)
max
≥ V
to V
÷ R
J(max)
– T
÷ I
CC(max)
JA
CC(max)
A
CC(max)
= 165 °C – 150 °C = 15 °C
= 165°C, V
CC(est)
= 15°C ÷ 228 °C/W = 65.8 mW
115 Northeast Cutoff, Box 15036
CC
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
, then operation between V
A
. If V
at T
= 65.8 mW ÷ 5 mA = 13.2 V
, the application and device can
and V
A
CC(est)
= 150°C, package LH, using a
CC(max)
CC(max)
J
≤ V
resulting from internal
= 24 V, and
CC(max)
requires enhanced
D(max)
CC(est)
, then reli-
CC(est)
. First,
.
and
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