FEATURES
High performance replacement for ZRA124 and
ZRA125 references
Small outline SOT23
SO8 and E-Line alternatives available
30
A knee current
20ppm/C typical temperature coefficient
Unconditionally stable
0.5%, 1%, 2% and 3% tolerance
Contact Zetex marketing for availability of tighter
tolerance devices
APPLICATIONS
Battery powered equipment
Precision power supplies
Portable instrumentation
Portable communications devices
Notebook and palmtop computers
Data acquisition systems
A/D and D/A converters
Test equipment
DESCRIPTION
The ZXRE125 is a bandgap circuit designed to achieve
a precision micropower voltage reference of 1.22
volts. The device is available in the small outline
SOT23 surface mount package which is ideal for
applications where space saving is important.
SOT23 tolerance is available to 0.5% for precision
applications. Excellent performance is maintained
over the 30
A to 5mA operating current range with a
typical temperature coefficient of only 20ppm/C. The
device has been designed to be highly tolerant of
capacitive loads so maintaining excellent stability.
This device offers a SOT23 pin for pin compatible
replacement of the ZRA124 and ZRA125 series of
voltage references. SO8 and E-Line (TO92 style)
packages can also be made available.
V
R
G
nd
SOT23 MICROPOWER 1.22V VOLTAGE REFERENCE
1
1.5V
4k7
1.22V
SCHEMATIC DIAGRAM
APPLICATIONS CIRCUIT
Low quiescent reference from a 1.5V battery source.
ZXRE125
ISSUE 4 - JANUARY 2002
ABSOLUTE MAXIMUM RATINGS
Reverse Current
30mA
Forward Current
10mA
Operating temperature.
-40 to 85C
Storage temperature.
-55 to 125C
Power Dissipation (T
amb
=25C)
SOT23
330mW
SO8
625mW
E-Line
500mW
2
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
=100
A
1.214
1.208
1.196
1.183
1.22
1.22
1.22
1.22
1.226
1.232
1.244
1.257
0.5
1
2
3
V
I
MIN
Minimum Knee Current
30
A
I
R
Recommended Operating
Current Range
0.03
5
mA
T
C
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R(min)
to
I
R(max)
20
90
ppm/C
V
R
I
R
Reverse Breakdown Voltage
change with Current
I
R
=30
A to 1mA
I
R
=1mA to 5mA
1
10
mV
mV
Z
R
Reverse Dynamic Impedance
I
R
=1mA
f =100Hz
I
AC
=0.1 I
R
0.2
0.6
E
N
Wideband Noise Voltage
I
R
=8
A to
100
A
f=10Hz to 10kHz
60
V(rms)
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.
Note: 0.5% SOT23 only.
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Reverse Voltage (V)
Reverse Characteristics
0
1
2
3
4
5
Rev
e
r
s
e Cu
r
r
en
t
(
m
A
)
TA=-40c TO +85C
ZXRE125
ISSUE 4 - JANUARY 2002
3
TYPICAL CHARACTERISTICS
-40
-20
0
20
40
60
80
Temperature (C)
Temperature Drift
1.19
1.20
1.21
1.22
1.23
1.24
1.25
Refe
r
e
n
c
e V
o
lt
ag
e
(V)
0.01
0.1
1
10
100
Frequency (kHz)
Slope Resistance v Frequency
0.1
1
10
100
S
l
ope
R
e
si
st
a
n
ce
(
)
20mA
1mA
100
A
0
40
80
120
140
Time (
s)
Transient Response
0
0.5
1.5
1.0
10
0
I
in
(
A)
V
R
(V)
10
A
20mA
0
10
20
30
40
50
60
70
80
90
100
Reference Current (
A)
Noise Voltage
0
10
20
30
40
50
60
70
80
Wi
de
b
a
nd
N
o
i
s
e
(
V)
100
10
1
0.1
0.01
0.001
Reference Current (mA)
Slope Resistance v Current
0
2
4
6
8
10
12
14
S
l
ope
R
e
si
st
a
n
ce
(
)
25C
-40C
0.1
1
10
100
1000
Forward Current (mA)
Forward Characteristics
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Fo
r
w
ar
d
V
o
l
t
ag
e
(V
)
85C
ZXRE125
ISSUE 4 - JANUARY 2002
4
Zetex plc.
Fields New Road, Chadderton, Oldham, OL9-8NP, United Kingdom.
Telephone: (44)161 622 4422 (Sales), (44)161 622 4444 (General Enquiries)
Fax: (44)161 622 4420
Zetex GmbH
Zetex Inc.
Zetex (Asia) Ltd.
These are supported by
Streitfeldstrae 19
47 Mall Drive, Unit 4
3701-04 Metroplaza, Tower 1
agents and distributors in
D-81673 Mnchen
Commack NY 11725
Hing Fong Road,
major countries world-wide
Germany
USA
Kwai Fong, Hong Kong
Zetex plc 2001
Telefon: (49) 89 45 49 49 0
Telephone: (631) 543-7100
Telephone:(852) 26100 611
Fax: (49) 89 45 49 49 49
Fax: (631) 864-7630
Fax: (852) 24250 494
http://www.zetex.com
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any
purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the
right to alter without notice the specification, design, price or conditions of supply of any product or service.
Ordering Information
Device
TOL%
Package
Partmarking
ZXRE125CF
0.5
SOT23
12J
ZXRE125DF
1
SOT23
12H
ZXRE125EF
2
SOT23
12G
ZXRE125FF
3
SOT23
12F
ZXRE125DN8 1
SO8
ZXRE125D
ZXRE125EN8 2
SO8
ZXRE125E
ZXRE125FN8 3
SO8
ZXRE125F
ZXRE125DR 1
E-Line
ZXRE125D
ZXRE125ER 2
E-Line
ZXRE125E
ZXRE125FR 3
E-Line
ZXRE125F
NOTE:
For tape and reel options add suffix TA to the part number
eg ZXRE125DFTA
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
Connection Diagrams
ZXRE125
ISSUE 4 - JANUARY 2002
PDF 
ZIP