DEVICE DESCRIPTION
The ZRA400 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 4.096 volts. The device is available
in small outline surface mount packages, ideal
for applications where space saving is
important.
The ZRA400 design provides a stable voltage
without an external capacitor and is stable with
capacitive loads. The ZRA400 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 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.
FEATURES
Small outline SO8, SOT23 and TO92 style
packages.
No stabilising capacitor required
Typical T
C
15ppm/C
Typical slope resistance 0.55
3%, 2% and 1%
tolerance
Industrial temperature range
Operating current 50
A to 5mA
APPLICATIONS
Battery powered and portable equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
Crystal oscillators
PRECISION 4.0 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 1 - JANUARY 1996
ZRA400
V
R
G
nd
1 - 33
SCHEMATIC DIAGRAM
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
4.05
4.01
3.97
4.096
4.096
4.096
4.14
4.18
4.22
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)
15
50
ppm/C
R
S
Slope Resistance
0.55 2
Z
R
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.5
1.2
T
C
=
V
R
Change
x
1000000
V
R
x Temperature Change
R
S
=
V
R
Change
(
I
R
(
min
)
to
I
R
(
max
))
I
R
(
max
)
-
I
R
(
min
)
1 - 35
ZRA400
ZRA400
1 - 34
0
Reverse Characteristics
Reverse Voltage (V)
R
e
v
e
r
se C
urr
e
nt (
A
)
0
10
20
30
50
4.0
2.0
40
T
)
=25C
T
)
=-40C
T
)
=85C
4.06
4.10
4.08
TYPICAL CHARACTERISTICS
Fo
r
w
ard
V
ol
tag
e
(
V)
Temperature (C)
Reference Current (mA)
Frequency (kHz)
Temperature Drift
Slope Resistance v Current
Re
f
ere
nce vol
t
age
(
V)
Sl
op
e
r
esi
stan
ce
(
)
Time (
s)
1
10
0.1
Slope Resistance v Frequency
-40
-20
0
20
40
60
80
Forward Characteristics
Forward Current (mA)
0.1
1
10
100
1000
I
R
=150
A to 5mA
0
2.0
4.0
1
0.1
10
100
1000
10
100
1
0.1
0.01
0
1000
2000
0
10
0
2.0
4.0
0
1
2
3
4
Time (
s)
Sl
op
e
re
si
stan
ce
(
)
I
4
=150
A
I
4
=1mA
I
4
=5mA
0.4
0.6
0.8
1.0
1.2
1.4
1.6
T
A
=25C
T
A
=-40C
T
A
=85C
0
10
0
2.0
4.0
Transient Response
(Single Pulse)
Transient Response
(Repetitive Pulse)
INPUT
OUTPUT
40K
150
A
5mA
150
A
1K2
5mA
INPUT
OUTPUT
40K
150
A
5mA
150
A
1K2
5mA
V
I
N
-
(V
)
V
R
-
(V)
V
I
N
-
(V)
V
R
- (V)
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
4.05
4.01
3.97
4.096
4.096
4.096
4.14
4.18
4.22
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)
15
50
ppm/C
R
S
Slope Resistance
0.55 2
Z
R
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.5
1.2
T
C
=
V
R
Change
x
1000000
V
R
x Temperature Change
R
S
=
V
R
Change
(
I
R
(
min
)
to
I
R
(
max
))
I
R
(
max
)
-
I
R
(
min
)
1 - 35
ZRA400
ZRA400
1 - 34
0
Reverse Characteristics
Reverse Voltage (V)
R
e
v
e
r
se C
urr
e
nt (
A
)
0
10
20
30
50
4.0
2.0
40
T
)
=25C
T
)
=-40C
T
)
=85C
4.06
4.10
4.08
TYPICAL CHARACTERISTICS
Fo
r
w
ard
V
ol
tag
e
(
V)
Temperature (C)
Reference Current (mA)
Frequency (kHz)
Temperature Drift
Slope Resistance v Current
Re
f
ere
nce vol
t
age
(
V)
Sl
op
e
r
esi
stan
ce
(
)
Time (
s)
1
10
0.1
Slope Resistance v Frequency
-40
-20
0
20
40
60
80
Forward Characteristics
Forward Current (mA)
0.1
1
10
100
1000
I
R
=150
A to 5mA
0
2.0
4.0
1
0.1
10
100
1000
10
100
1
0.1
0.01
0
1000
2000
0
10
0
2.0
4.0
0
1
2
3
4
Time (
s)
Sl
op
e
re
si
stan
ce
(
)
I
4
=150
A
I
4
=1mA
I
4
=5mA
0.4
0.6
0.8
1.0
1.2
1.4
1.6
T
A
=25C
T
A
=-40C
T
A
=85C
0
10
0
2.0
4.0
Transient Response
(Single Pulse)
Transient Response
(Repetitive Pulse)
INPUT
OUTPUT
40K
150
A
5mA
150
A
1K2
5mA
INPUT
OUTPUT
40K
150
A
5mA
150
A
1K2
5mA
V
I
N
-
(V
)
V
R
-
(V)
V
I
N
-
(V)
V
R
- (V)
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
Part No
Tol% Package
Partmark
ZRA400A03
3
E-Line
ZRA40003
ZRA400A02
2
E-Line
ZRA40002
ZRA400A01
1
E-Line
ZRA40001
ZRA400F03
3
SOT23
40A
ZRA400F02
2
SOT23
40B
ZRA400F01
1
SOT23
40C
ZRA400N803 3
SO8
ZRA40003
ZRA400N802 2
SO8
ZRA40002
ZRA400N801 1
SO8
ZRA40001
Part No
Tol% Package
Partmark
ZRA400R03
3
E-Line *
ZRA400R3
ZRA400R02
2
E-Line *
ZRA400R2
ZRA400R01
1
E-Line *
ZRA400R1
ZRA400Y03
3
E-Line
ZRA40003
ZRA400Y02
2
E-Line
ZRA40002
ZRA400Y01
1
E-Line
ZRA40001
* E-Line 3 pin Reversed
E-Line 2 pin
E-Line 3 pin
ORDERING INFORMATION
E-Line, 3 pin Package Suffix A
Bottom
View
Pin 1 floating or connected to pin 3
ZRA400
ZRA400
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
Part No
Tol% Package
Partmark
ZRA400A03
3
E-Line
ZRA40003
ZRA400A02
2
E-Line
ZRA40002
ZRA400A01
1
E-Line
ZRA40001
ZRA400F03
3
SOT23
40A
ZRA400F02
2
SOT23
40B
ZRA400F01
1
SOT23
40C
ZRA400N803 3
SO8
ZRA40003
ZRA400N802 2
SO8
ZRA40002
ZRA400N801 1
SO8
ZRA40001
Part No
Tol% Package
Partmark
ZRA400R03
3
E-Line *
ZRA400R3
ZRA400R02
2
E-Line *
ZRA400R2
ZRA400R01
1
E-Line *
ZRA400R1
ZRA400Y03
3
E-Line
ZRA40003
ZRA400Y02
2
E-Line
ZRA40002
ZRA400Y01
1
E-Line
ZRA40001
* E-Line 3 pin Reversed
E-Line 2 pin
E-Line 3 pin
ORDERING INFORMATION
E-Line, 3 pin Package Suffix A
Bottom
View
Pin 1 floating or connected to pin 3
ZRA400
ZRA400
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