FEATURES
•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
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 30µA 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. An E-Line (TO92 style) package is
also 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 5 - JANUARY 2003
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA
Forward Current 10mA
Operating temperature. -40 to 85°C
Storage temperature. -55 to 125°C
Power Dissipation (Tamb=25°C)
SOT23 330mW
E-Line 500mW
2
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
SYMBOL PARAMETER CONDITIONS LIMITS TOL. % UNITS
MIN TYP MAX
VRReverse Breakdown Voltage IR=100µA1.214
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
IMIN Minimum Knee Current 30 µA
IRRecommended Operating
Current Range
0.03 5 mA
TC † Average Reverse Breakdown
Voltage Temperature
Coefficient
IR(min) to
IR(max)
20 90 ppm/°C
∆VR
∆IR
Reverse Breakdown Voltage
change with Current
IR=30µA to 1mA
IR=1mA to 5mA
1
10
mV
mV
ZRReverse Dynamic Impedance IR =1mA
f =100Hz
IAC=0.1 IR
0.2 0.6 Ω
ENWideband Noise Voltage IR=8µA to 100µA
f=10Hz to 10kHz
60 µV(rms)
† TC = (VR (max
)−VR ( min
)) x 1000000
VR x (T(max
)−T(min
))
Note: VR(max) - VR(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
Reverse Current (mA)
TA=-40c TO +85C
ZXRE125
ISSUE 5 - JANUARY 2003
3
TYPICAL CHARACTERISTICS
-40-20 0 20406080
Temperature (°C)
Temperature Drift
1.19
1.20
1.21
1.22
1.23
1.24
1.25
Reference Voltage (V)
0.01 0.1 1 10 100
Frequency (kHz)
Slope Resistance v Frequency
0.1
1
10
100
Slope Resistance (Ω)
20mA
1mA
100µA
04080120140
Time (µs)
Transient Response
0
0.5
1.5
1.0
10
0
I
in
(µA) V
R
(V)
10µA
20mA
0 102030 405060708090100
Reference Current (µA)
Noise Voltage
0
10
20
30
40
50
60
70
80
Wideband Noise (µV)
1001010.10.010.001
Reference Current (mA)
Slope Resistance v Current
0
2
4
6
8
10
12
14
Slope Resistance (Ω)
25°C
-40°C
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
Forward Voltage (V)
85°C
僓僓
ZXRE125
ISSUE 5 - JANUARY 2003
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
Streitfeldstraße 19 700 Veteran’s Memorial Hwy 3701-04 Metroplaza, Tower 1 agents and distributors in
D-81673 München Hauppauge, NY 11788 Hing Fong Road, major countries world-wide
Germany USA Kwai Fong, Hong Kong Zetex plc 2003
Telefon: (49) 89 45 49 49 0 Telephone: (631) 360-2222 Telephone:(852) 26100 611
Fax: (49) 89 45 49 49 49 Fax: (631) 360-8222 Fax: (852) 24250 494 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
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
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 5 - JANUARY 2003
