PRECISION 1.25 VOLT
MICROPOWER VOLTAGE REFERENCE
ISSUE 2 - FEBRUARY 1997
DEVICE DESCRIPTION
The ZRA125 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 1.25 volts. The device is available
in small outline surface mount packages, ideal
for applications where space saving is
important, as well as packages for through hole
requirements.
The ZRA125 design provides a stable voltage
without an external capacitor and is stable with
capacitive loads. The ZRA125 is recommended
for operation between 50µA and 5mA and so
is ideally suited to low power and battery
powered applications.
Excellent performance is maintained to a
suggested 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.
ZRA125
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Typical T
C
30ppm/°C
Typical slope resistance 0.65Ω
±
3%,2% and 1% tolerance
Industrial temperature range
Operating current 50µA to 5mA
Transient response, stable in less than 10µs
Optional extended current range
Battery powered and portable equipment.
Metering and measurement systems.
Instrumentation.
Data acquisition systems.
Precision power supplies.
Test equipment.
APPLICATIONS
FEATURES
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Small outline SOT23, SO8 and TO92 style
packages
No stabilising capacitor required
SCHEMATIC DIAGRAM
V
R
G
nd
1 - 24
ZRA125
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
25mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
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
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
Reverse Breakdown Voltage I
R
=150µA
1.228
1.225
1.21
0.05
30
LIMITS
TYP MAX
1.24 1.252
1.25 1.275
1.25 1.29
30
50
5
90
1
2
3
V
TOL.
%
UNITS
I
MIN
I
R
T
C
Minimum Operating Current
Recommended Operating
Current
Average Reverse
Breakdown Voltage Temp.
Co.
Slope Resistance
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
Wideband Noise Voltage
I
R
= 150µA
f = 100Hz to
10kHZ
I
R(min)
to
I
R(max)
µA
mA
ppm/°C
R
S
§
Z
R
0.65 2
0.5
1
Ω
Ω
E
N
40
µV(rms)
60
Reverse Current (µA)
T
C
=
V
R
Change
x
1000000
V
R
x Temperature Change
V
R
Change
(I
R
(min)
to I
R
(max))
I
R
(
max
) −
I
R
(
min)
50
40
30
§
R
S
=
20
T
)
=8
C
5°
)
=
2
5
°C
0
-4
°C
10
T
T
)
=
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Reverse Voltage (V)
Reverse Characteristics
1 - 45
ZRA125
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix Y
E-Line, 3 pin,Rev Package Suffix R
Bottom View
Bottom View
Pin 3 floating or connected to pin 1
E-Line, 3 pin Package Suffix A
SO8 Package Suffix N8
Bottom View
Pin 1 floating or connected to pin 3
Top View
SOT23 Package Suffix F
Top View
Pin 1 floating or connected to pin 2
Analog electronics
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