ZXRE125
SOT23 MICROPOWER 1.22V VOLTAGE REFERENCE
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 30µA to 5mA operating current range with a
FEATURES
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High performance replacement for ZRA124 and
ZRA125 references
Small outline SOT23
SO8 and E-Line alternatives available
30µA 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
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.
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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
SCHEMATIC DIAGRAM
V
R
APPLICATIONS CIRCUIT
1.5V
4k7
1.22V
G
nd
Low quiescent reference from a 1.5V battery source.
APPLICATIONS
ISSUE 4 - JANUARY 2002
1
ZXRE125
ABSOLUTE MAXIMUM RATINGS
Reverse Current
Forward Current
Operating temperature.
Storage temperature.
30mA
10mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23
330mW
SO8
625mW
E-Line
500mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
V
R
Reverse Breakdown Voltage
I
R
=100µA
1.214
1.208
1.196
1.183
TYP
1.22
1.22
1.22
1.22
MAX
1.226
1.232
1.244
1.257
30
0.03
I
R(min)
to
I
R(max)
I
R
=30µA to 1mA
I
R
=1mA to 5mA
I
R
=1mA
f =100Hz
I
AC
=0.1 I
R
I
R
=8µA to
100µA
f=10Hz to 10kHz
5
TOL. %
UNITS
0.5 ‡
1
2
3
V
I
MIN
I
R
T
C
†
Minimum Knee Current
Recommended Operating
Current Range
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
change with Current
Reverse Dynamic Impedance
µA
mA
ppm/°C
5
20
90
∆V
R
∆I
R
Z
R
1
10
0.2
0.6
mV
mV
Ω
E
N
Wideband Noise Voltage
60
µV(rms)
†
T
C
=
(V
R
(max )
−V
R
(
min
)
)
x
1000000
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.
Reverse Current (mA)
V
R
x
(T
(max )
−T
(min )
)
4
3
TA=-40c TO +85C
2
1
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Reverse Voltage (V)
Reverse Characteristics
ISSUE 4 - JANUARY 2002
2
ZXRE125
TYPICAL CHARACTERISTICS
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.1
1
10
100
1000
1.25
1.24
Reference Voltage (V)
Forward Voltage (V)
1.23
1.22
1.21
1.20
1.19
-40
-20
0
20
40
60
80
Forward Current (mA)
Temperature (°C)
Forward Characteristics
Temperature Drift
14
12
100
Slope Resistance (Ω)
10
8
6
4
2
0
0.001
-40°C
25°C
85°C
Slope Resistance (Ω)
10
1
20mA
1mA
100µA
0.01
0.1
1
10
100
0.1
0.01
0.1
1
10
100
Reference Current (mA)
Frequency (kHz)
Slope Resistance v Current
1.5
1.0
0.5
10µA
20mA
Slope Resistance v Frequency
80
70
Wideband Noise (µV)
80
120
140
V
R
(V)
60
50
40
30
20
10
0
0
I
in
(µA)
10
0
0
40
0
10 20
30
40
50
60
70
80
90
100
Time (µs)
Reference Current (µA)
Transient Response
Noise Voltage
ISSUE 4 - JANUARY 2002
3
ZXRE125
Ordering Information
Device
ZXRE125CF
ZXRE125DF
ZXRE125EF
ZXRE125FF
ZXRE125DN8
ZXRE125EN8
ZXRE125FN8
ZXRE125DR
ZXRE125ER
ZXRE125FR
TOL%
0.5
1
2
3
1
2
3
1
2
3
Package
SOT23
SOT23
SOT23
SOT23
SO8
SO8
SO8
E-Line
E-Line
E-Line
Partmarking
12J
12H
12G
12F
ZXRE125D
ZXRE125E
ZXRE125F
ZXRE125D
ZXRE125E
ZXRE125F
NOTE:
For tape and reel options add suffix TA to the part number
eg ZXRE125DFTA
Connection Diagrams
SOT23
Package Suffix – F
SO8
Package Suffix – N8
E-Line, 3 pin,Rev
Package Suffix – R
Top View –
Pin 1 floating or
connected to pin 2
Top View
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
Bottom View –
Pin 3 floating or
connected to pin 1
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
Zetex Inc.
47 Mall Drive, Unit 4
Commack NY 11725
USA
Telephone: (631) 543-7100
Fax: (631) 864-7630
Zetex (Asia) Ltd.
3701-04 Metroplaza, Tower 1
Hing Fong Road,
Kwai Fong, Hong Kong
Telephone:(852) 26100 611
Fax: (852) 24250 494
These are supported by
agents and distributors in
major countries world-wide
Zetex
plc 2001
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.
ISSUE 4 - JANUARY 2002
4
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