Note:
3%, 2% and 1% tolerance devices are
not recommended for new designs.
Refer to ZRC250
V
R
G
nd
DEVICE DESCRIPTION
The ZRA250 uses a bandgap circuit design
to achieve a precision micropower voltage
reference of 2.5 volts. The device is available
in small outline surface mount packages,
ideal for applications where space saving is
important.
The ZRA250 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA250 is
recommended for operation between 50
A
and 5mA and so is ideally suited to low
power and battery powered applications.
Excellent performance is maintained to an
absolute maximum of 25mA, however the
rugged design and 20 volt processing allows
the reference to withstand transient effects
and currents up to 200mA. Superior
switching capability allows the device to
reach stable operating conditions in only a
few microseconds.
FEATURES
Small outline SOT23, SO8 and TO92
style packages.
No stabilising capacitor required
Typical T
C
30ppm/C
Typical slope resistance 0.4
3%, 2%,1% and 0.5% tolerance
Industrial temperature range
Operating current 50
A to 5mA
Transient response, stable in less than
10
s
Optional extended current range
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 4 - APRIL 2002
SCHEMATIC DIAGRAM
ZRA250
4-232
ABSOLUTE MAXIMUM RATING
Reverse Current
25mA
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
=150
A
2.4875
2.475
2.45
2.425
2.5
2.5
2.5
2.5
2.5125
2.525
2.55
2.575
0.5
1
2
3
V
I
MIN
Minimum Operating Current
25
50
A
I
R
Recommended Operating
Current
0.05
5
mA
T
C
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
30
90
ppm/C
R
S
Slope Resistance
0.4
2
Z
R
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.3
0.8
E
N
Wideband Noise Voltage
I
R
= 150
A
f = 10Hz to
10kHz
45
V(rms)
ZRA250
0
Reverse Characteristics
Reverse Voltage (V)
R
e
v
e
r
se
C
u
r
r
e
nt
(
A
)
0.2
0.6
10
20
30
40
50
60
1.0
1.8
2.6
1.4
2.2
T
A
=2
5C
T
A
=8
5C
T
A
=-4
0C
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
)
4-233
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
ZRA250
E-Line, 3 pin Package Suffix A
Bottom
View
Pin 1 floating or connected to pin 3
4-235
Note:
3%, 2% and 1% tolerance devices are
not recommended for new designs.
Refer to ZRC250
Part No
Tol%
Package
Partmark
ZRA250A03
3
E-Line
ZRA25003
ZRA250A02
2
E-Line
ZRA25002
ZRA250A01
1
E-Line
ZRA25001
ZRA250A005
0.5
E-Line
ZRA250005
ZRA250F03
3
SOT23
25A
ZRA250F02
2
SOT23
25B
ZRA250F01
1
SOT23
25C
ZRA250F005
0.5
SOT23
25Y
ZRA250N803
3
SO8
ZRA25003
ZRA250N802
2
SO8
ZRA25002
ZRA250N801
1
SO8
ZRA25001
ZRA250N8005
0.5
SO8
ZRA250005
Part No
Tol%
Package
Partmark
ZRA250R03
3
E-Line *
ZRA250R3
ZRA250R02
2
E-Line *
ZRA250R2
ZRA250R01
1
E-Line *
ZRA250R1
ZRA250R005
0.5
E-Line *
ZRA250R05
ZRA250Y03
3
E-Line
ZRA25003
ZRA250Y02
2
E-Line
ZRA25002
ZRA250Y01
1
E-Line
ZRA25001
ZRA250Y005
0.5
E-Line
ZRA250005
* E-Line 3 pin Reversed
E-Line 2 pin
E-Line 3 pin
ORDERING INFORMATION
ZRA250
4-236
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