SEMICONDUCTOR
AS300
Shunt Temperature Sensor
Description
The AS300 is a two-terminal integrated circuit temperature sensor. It is
a precision-trimmed shunt type regulator that emulates a zener diode
in function. Its output voltage is linearly proportional to temperature in
Kelvin. The output voltage is calibrated for 3.000 V at 27¡C (300 K) and
increases by 10 mV/¡C.
The AS300 is available in four packages.The SOT-223 offers a large
heat-sink for transferring heat to the die for fast and accurate thermal
sensing. The SOT-223 is especially effective at sensing the tem-
perature of hybrid and MCM substrates. The SOT-23 is best-suited
for applications requiring a small footprint or precision force/sense
metering.
Features
Calibrated directly in Kelvin
Linear 10 mV/¡C scale factor
1¡C typical accuracy at 27¡C (300 K)
Fully rated for Ð40 to 125¡C
(233 to 398 K)
¥
Suitable for remote applications
¥
Low-impedance output, 0.3 ½ for a
1 mA load
¥
Now available in the SOT-223 for
improved substrate temperature
sensing
¥
¥
¥
¥
Pin Configuration Ñ
Top view
TO-92 (LP)
SOT-223 (G)
V
TEMP
V
TEMP
GND (F)
GND (S)
GND (F)
GND (S)
SOIC (D)
SOT-23/3L (VS)
GND (S)
GND (F)
N/C
N/C
1
2
3
4
8
7
6
5
N/C
N/C
GND
V
TEMP
(F)
GND
V
TEMP
(F)
V
TEMP
Ordering Information
AS300
Circuit Type:
Shunt Temperature Sensor
LP
A
Packaging Option:
A = Ammo Pack
B = Bulk
T = Tube
7 = Tape and Reel (7" Reel Dia)
13 = Tape and Reel (13" Reel Dia)
Package Style:
D = SOIC
G = SOT-223
LP = TO-92
VS = SOT-23/3L
ASTEC Semiconductor
1
AS300
Functional Block Diagram
V
TEMP
Shunt Temperature Sensor
+
–
+
–
10 mV/°C
GND
Pin Function Description
Pin Number
TO, SOT
1
2
3
Ð
SOIC
1
2
6
5
Function
GND (S)
GND (F)
V
TEMP
(F)
V
TEMP
(S)
Description
Optional sense pin ground, otherwise tie to substrate pin GND (F).
Signal ground and circuit substrate.
Output voltage proportional to temperature. V
TEMP
is nominally 3.00 V
at 27¡C (300 K) and increases at 10 mV/¡C.
Optional sense pin for V
TEMP
. Available on the 8L SOIC package only.
Tie pin to V
TEMP
(F) if not using force/sense metering.
Absolute Maximum Ratings
Parameter
Supply Current
Continuous Power Dissipation at 25¡C
TO-92
SOT-223
8L SOIC
SOT-23/3L
Junction Temperature
Operating Temperature
Storage Temperature
Lead Temp, Soldering 10 Seconds
T
STG
T
L
T
J
Symbol
I
REF
P
D
775
1250
750
200
150
Ð40 to 125
Ð65 to 150
300
mW
mW
mW
mW
¡C
¡C
¡C
¡C
Rating
20
Unit
mA
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sec-
tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
ASTEC Semiconductor
2
Shunt Temperature Sensor
Typical Thermal Resistances
Package
TO-92
SOT-223
8L SOIC
SOT-23/3L
θ
JA
160¡C/W
115¡C/W
175¡C/W
575¡C/W
θ
JC
80¡C/W
8¡C/W
45¡C/W
150¡C/W
AS300
Typical Derating
6.3 mW/¡C
8.7 mW/¡C
5.7 mW/¡C
1.7 mW/¡C
Electrical Characteristics
Electrical Characteristics are guaranteed over the full junction temperature range (Ð40 to 125¡C). Ambient temperature must be
derated based upon power dissipation and package thermal characteristics.
Parameter
Output Voltage
Symbol
V
TEMP
V
TEMP
Temperature Coefficient Error
Minimum Operating Current
Output Impedance
I
K(min)
Z
KA
I
K
= 0.6 to 5.5 mA
0.3
Test Condition
I
K
= 2 mA, T
J
= 27¡C (300 K)
I
K
= 2 mA, T
J
= 100¡C (373 K)
I
K
= 2 mA, deviation from 10 mV/¡C
Min.
2.970
3.690
Typ.
3.000
3.730
40
0.6
2
Max.
3.030
3.770
Unit
V
V
µV/¡C
mA
½
Test Circuit
V
IN
I
K
V
TEMP
Figure 1
ASTEC Semiconductor
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AS300
Typical Performance Curves
Shunt Temperature Sensor
5.0
I
K
= 2 mA
4.5
V
TEMP
– Output Voltage (V)
4.0
3.5
3.0
2.5
2.0
1.5
–50
Output Voltage
Forward Characteristics
0.7
T
J
= 27°C
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
0.01
–25
250
0
25
50
75
300
350
T – Temperature
100
125
400
(°C)
(K)
VF – Forward Voltage (V)
0.1
1.0
10
100
IF – Forward Current (µA)
Figure 2
Figure 3
Thermal Response by Package in Still Air
120
SOT-223
100
Percent of Thermal Equilibrium (%)
Percent of Thermal Equilibrium (%)
100
120
Thermal Response by Package in a Stirred Oil Bath
SOT-223
80
TO-92
60
80
TO-92
8L SOIC
60
40
8L SOIC
20
40
20
0
0
4
8
12
Time (s)
16
20
24
0
0
2
4
6
Time (s)
8
10
12
Figure 4
Figure 5
ASTEC Semiconductor
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Shunt Temperature Sensor
Typical Performance Curves
AS300
Operating Characteristics
1.50
27°C
1.25
I
K
– Reverse Current (mA)
I
K
– Reverse Current (µA)
1k
10k
Operating Characteristics
27°C
0°C
100
1.00
0°C
100°C
0.75
10
0.50
0.25
100°C
0
0
1
2
3
V
TEMP
– Output Voltage (V)
4
1.0
0
0
1
2
3
V
TEMP
– Output Voltage (V)
4
Figure 6
Figure 7
Dynamic Impedance
1k
T
J
= 27°C
I
K
= 2 mA
100
Input and Output Voltage (V)
Z
K
– Output Impedance (Ω)
2
4
T
J
= 27°C
3
Transient Response
OUTPUT
1k
1
0
V
IN
V
OUT
10
1.0
5
INPUT
0.1
0.01
0.01
0
0.1
1.0
10
10
1k
0
25
50
t – Time (µs)
500
600
f – Frequency (kHz)
Figure 8
Figure 9
ASTEC Semiconductor
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