DEVICE DESCRIPTION
The ZRA245 uses a bandgap circuit design
to achieve a precision voltage reference of
2.45 volts. The device is available in small
outline surface mount packages, ideal for
a p p l i c a t i o n s w h e re s p a c e s a v i n g i s
important.
The ZRA245 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA245 is
recommended for operation between 2mA
and 120mA.
FEATURES
Small outline SOT23, SO8 and TO92
style package
No stabilising capacitor required
Typical T
C
15ppm/C
Typical slope resistance 0.26
3% , 2% and 1% tolerance
Industrial temperature range
Operating current 2mA to 120mA
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 3 -- MARCH 1998
ZRA245
V
R
G
nd
1.25V
REF
SCHEMATIC DIAGRAM
4-227
ABSOLUTE MAXIMUM RATING
Reverse Current
200mA
Forward Current
25mA
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 125C
Power Dissipation (T
amb
=25C)
SOT23
330mW
E-Line, 3 pin (TO92)
500mW
E-Line, 2 pin (TO92)
500mW
SO8
625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25C
SYMBOL PARAMETER
CONDITIONS
LIMITS
TOL.
%
UNITS
MIN
TYP MAX
V
R
Reverse Breakdown Voltage
I
R
=5mA
2.43
2.40
2.38
2.45
2.45
2.45
2.47
2.50
2.52
1
2
3
V
I
MIN
Minimum Operating Current
2
mA
I
R
Recommended Operating
Current
2
120
mA
T
C
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
15
50
ppm/C
R
S
Slope Resistance
0.26 0.5
Z
R
Reverse Dynamic Impedance
I
R
= 5mA
f = 100Hz
I
AC
= 0.1 I
R
0.28 1
E
N
Wideband Noise Voltage
I
R
= 5mA
f = 10Hz to
10kHz
65
V(rms)
ZRA245
T
C
=
(
V
R
(
max
)
-
V
R
(
min
)
)
x 1000000
V
R
x
(
T
(
max
)
-
T
(
min
)
)
Note: V
R(max)
- V
R(min)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
R
S
=
V
R
Change
(
I
R
(
min
)
to I
R
(
max
))
I
R
(
max
)
-
I
R
(
min
)
4-228
SO8 Package
Suffix N8
Top
View
SOT23 Package
Suffix F
Top
View
Pin 1 floating or connected to pin 2
E-Line, 3 pin,Rev Package Suffix R
Bottom
View
Pin 3 floating or connected to pin 1
E-Line, 2 pin Package Suffix Y
Bottom
View
CONNECTION DIAGRAMS
ZRA245
E-Line, 3 pin Package Suffix A
Bottom
View
Pin 1 floating or connected to pin 3
4-230
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