August 2007 Rev 2 1/9
9
TS4041
1.225V micropower shunt voltage reference
Features
■1.225V typical out put voltage
■Ultra low operatin g curren t: 6 5µA m aximum at
25°C
■High precision @ 25°C
–+/- 2%
–+/- 1%
– +/- 0.5%
■High stability when used with capacitive loads
■Industrial temperature range: -40°C to +85°C
■150ppm/°C maximum temperature coefficient
Application
■Computers
■Instrumentation
■Battery chargers
■Switch mode power supply
■Battery operated equipments
Description
The TS4041 is a low power shunt voltage
reference providing a stable 1.225V output
voltage over the industrial temperature range
(-40°C to +85°C). A vailabe in SOT23-3 surface
mount pac kage, it can be designed in applica tions
where space saving is critica l.
The low operating current is a key advantage for
power restricted designs . In addition, the TS4041
is v ery stable and can be used in a broad range of
application conditions.
L
SOT23-3L
(Plastic micropackage)
Pin connections
(Top view)
www.st.com
Absolute maximum ratings and operating conditions TS4041
2/9
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
IkRev erse breakdown current 20 mA
IfForward current 10 mA
PdPower dissipation (1) SOT23-3
1. Pd is calculated with Tamb = 25°C and Tj = 150°C and Rthja = 340°C/W for the SOT23-3L package.
360 mW
Tstg Storage temperature -65 to +150 °C
ESD Human body model (H BM) (2)
2. Human body model: 100pF discharged through a 1.5kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.
2kV
Machine model (MM)(3)
3. Machine model: a 200pF cap is charged to the specified voltage, then discharged directly between two pins
of the device with no external series resistor (internal resistor < 5Ω), done for all couples of pin
combinations with other pins floating.
200 V
Tlead Lead temperature (soldering, 10 seconds) 260 °C
Table 2. Operating conditions
Symbol Parameter Value Unit
Imin Minimum operating current 65 μA
Imax Maximum operating current 12 mA
Toper Operating free air temperature range -40 to +85 °C
TS4041 Electrical characteristics
3/9
2 Electrical characteristics
Table 3. TS4041E (2% precision) Tamb = 25°C (1) (unless otherwis e specif ie d)
Symbol P arameter Test conditions Min. Typ. Max. Unit
Vk
Reverse breakdown voltage Ik = 100μA1.20
01.22
51.25
0V
Reverse breakdown voltage tolerance Ik = 100μA
-40°C < Tamb < +85°C -25
-36 +25
+36 mV
Ik-min Minimum operating current Tamb = 25°C 40 65 μA
-40°C < Tamb < +85°C 70
ΔVref/ΔT Average temperature coefficient Ik = 100μA 150 ppm/°C
ΔVk/ΔIkRev erse breakdown vo ltage change
with operating current range
Ik-min < Ik < 1mA
-40°C < Tamb < +85°C 0.3 2
2.5 mV
1mA < Ik < 12mA
-40°C < Tamb < +85°C 2.5 8
10
Rka Static impedance ΔIk = 45µA to 1mA 0.25 0.5 Ω
Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm
En Wide band noise Ik = 100μA, 10Hz < f < 10kHz 200 nV/√Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
Table 4. TS4041D (1% precision) Tamb = 25°C (1) (unless otherwis e sp e ci fie d )
Symbol P arameter Test conditions Min. Typ. Max. Unit
Vk
Reverse breakdown voltage Ik = 100μA1.21
31.22
51.23
7V
Reverse breakdown voltage tolerance Ik = 100μA
-40°C < Tamb < +85°C -12
-25 +12
+25 mV
Ik-min Minimum operating current Tamb = 25°C 40 65 μA
-40°C < Tamb < +85°C 70
ΔVref/ΔT Average temperature coefficient Ik = 100μA 150 ppm/°C
ΔVk/ΔIkRev erse breakdown vo ltage change
with operating current range
Ik-min < Ik < 1mA
-40°C < Tamb < +85°C 0.3 2
2.5 mV
1mA < Ik < 12mA
-40°C < Tamb < +85°C 2.5 8
10
Rka Static impedance ΔIk = 45μA to 1mA 0.25 0.5 Ω
Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm
En Wide band noise Ik = 100μA, 10Hz < f < 10kHz 200 nV/√Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
Electrical ch aracteristics TS4041
4/9
Table 5. TS4041C (0.5% precision) (1) Tamb = 25°C (unles s ot h erw is e sp e ci fie d)
Symbol P arameter Test conditions Min. Typ. Max. Unit
Vk
Reverse breakdown voltage Ik = 100μA1.21
91.22
51.23
1V
Reverse breakdown voltage tolerance Ik = 100μA
-40°C < Tamb < +85°C -6
-16 +6
+16 mV
Ik-min Minimum operating current Tamb = 25°C 40 60 μA
-40°C < Tamb < +85°C 65
ΔVref/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C
ΔVk/ΔIkRev erse breakdown vo ltage change
with operating current range
Ik-min < Ik < 1mA
-40°C < Tamb < +85°C 0.3 1.5
2mV
1mA < Ik < 12mA
-40°C < Tamb < +85°C 2.5 6
8
Rka Static impedance ΔIk = 45μA to 1mA 0.25 0.5 Ω
Kvh Long term stability Ik = 100μA, t = 1000hrs 120 ppm
En Wide band noise Ik = 100μA, 10Hz < f < 10kHz 200 nV/√Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
TS4041 Electrical characteristics
5/9
Figure 1. Reference voltage versus cathode
current Figure 2. Reference voltage versus cat hode
current
-1 -0.5 00.511.5
Reference voltage (V )
-8
-4
0
4
8
12
Cathode curr en t (mA)
-1 -0.5 00.5 11.5
Reference voltage (V)
-50
0
50
100
Cathode current (µA)
Figure 3. Test circuit Figure 4. Reference voltage versus
temperature
Ik=(Vin-Vref)/R
Vout=Vref
R
-40 -20 0 20 40 60 80
Temperature (°C)
1.19
1.2
1.21
1.22
1.23
1.24
1.25
1.26
Cathode voltage (V)
+0.5%
-0.5%
-1%
+1%
-2%
+2%
Figure 5. Static impedance vers us
temperature Fi gure 6. Noise voltage versus frequency
-40 -20 0 20 40 60 80
Temperature (°C)
0.2
0.21
0.22
0.23
0.24
0.25
Static impedance (Ohms)
0 1 10 100 1,000 10,000
Frequency (kHz)
0
200
400
600
800
Noise voltage (nV/Hz)
CL=10µF
CL=0µF
CL=100µF
Package information TS4041
6/9
3 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK® packages. These packages have a lead-free second level interconne ct. The
category of second level interconnect is marked on the package and on the inner bo x label,
in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
tradema rk. ECOPACK specifications are available at: www.st.com.
Figure 7. Pulse response for Ik=100µA Figure 8. Test circuit for pulse response at
Ik=100µA
0246810
Time (µs)
3V
0V
1.225V
Input
Output
0V
Ik=100µA
Output
18 KΩ
Pulse
Generator
Intput
Figure 9. Pulse response for Ik=1mA Figure 10. Test circuit for pulse response at
Ik=1mA
0246810
Tim e (µs)
3V
0V
1.225V
Input
Output
0V
Ik=1mA
Output
1.8 KΩ
Pulse
Generator
Intput
TS4041 Package information
7/9
Figure 11. SOT23-3 package mechanica l data
Ref.
Dimensions
Millimeters Mils
Min. Typ. Max. Min. Typ. Max.
A 0.890 1.120 35.05 44.12
A1 0.010 0.100 0.39 3.94
A2 0.880 0.950 1.020 34.65 37.41 40.17
b 0.300 0.500 11.81 19.69
C 0.080 0.200 3.15 7.88
D 2.800 2.900 3.040 110.26 114.17 119.72
E 2.100 2.64 82.70 103.96
E1 1.200 1.300 1.400 47.26 51.19 55.13
e 0.950 37.41
e1 1.900 74.82
L 0.400 0.600 15.75 23.63
L1 0.540 21.27
k0°8°0°8°
7110469/A
Ordering information TS4041
8/9
4 Ordering information
5 Revision history
Table 6. Or der codes
P art number Precision Temperature
range Package Packing Marking
TS4041EILT-1.2 2%
-40°C to +85°C SOT23-3 Tape & reel
L233
TS4041DILT-1.2 1% L232
TS4041CILT-1.2 0.5% L231
Table 7. Document revision history
Date Revision Changes
21-Mar-2002 1 Initial release.
20-Aug-2007 2 Removed TO-92 package information.
F ormat update.
TS4041
9/9
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