TS2431
Adjustable shunt voltage reference
Datasheet - production data
Industrial temperature range: - 40 to + 105
°C
Performance compatible with industrystandard TL431
Applications
Computers
Instrumentation
Battery chargers
Switch mode power supplies
Battery-operated equipment
Description
Features
Adjustable output voltage: 2.5 to 24 V
Precision selection at 25 °C: ± 2%, ± 1% and
± 0.5%
Sink current capability: 1 to 100 mA
The TS2431 is an adjustable shunt voltage
reference with guaranteed temperature stability
over the entire temperature range of operations
from - 40 to + 105 °C. The output voltage may be
set to any value between 2.5 and 24 V with an
external resistor bridge. Available in an SOT233L surface mount package, the device can be
implemented for those applications where spacesaving is of the utmost importance.
Table 1: Device summary
Order code
Temperature range
Package
Packing
TS2431ILT
TS2431AILT
-40 to + 105 °C
SOT23-3L
TS2431BILT
October 2017
DocID7961 Rev 6
This is information on a product in full production.
Tape and reel
Precision
Marking
2%
L285
1%
L286
0.5%
L287
1/16
www.st.com
Contents
TS2431
Contents
1
Absolute maximum ratings and operating conditions ................. 3
2
Electrical characteristics ................................................................ 4
3
Package information ....................................................................... 9
3.1
4
2/16
SOT23-3L package information ........................................................ 9
Revision history ............................................................................ 15
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TS2431
1
Absolute maximum ratings and operating
conditions
Absolute maximum ratings and operating conditions
Table 2: Absolute maximum ratings
Symbol
Vka
IK
IREF
Parameter
Cathode to anode voltage
Reverse breakdown current
Reference input current range
dissipation(1)
Pd
Power
Tstd
Storage temperature
ESD
TLEAD
Human body model
Machine model
SOT23-3L
(HBM)(2)
(MM)(3)
Lead temperature (soldering, 10 s)
Value
Unit
25
V
-100 to +150
mA
0.05 to +10
mA
360
mW
-65 to +150
°C
2
kV
200
V
260
°C
Notes:
(1)Pd
has been calculated with Tamb = 25 °C, Tjunction = 150 °C, Rthjc = 110 °C/W and Rthja = 340 °C/W for the
SOT23-3 package.
(2)Human
body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ
resistor between two pins of the device. This is done for all couples of connected pin combinations while the other
pins float.
(3)Machine
model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two
pins of the device with no external series resistor (internal resistor < 5 Ω). This is applied for all couples of
connected pin combinations while the other pins float.
Table 3: Operating conditions
Symbol
VKA
IK
Toper
Parameter
Cathode to anode voltage
Cathode operating
current(1)
Operating free air temperature range
Value
Unit
VREF to 24
V
1 to 100
mA
- 40 to + 105
°C
Notes:
(1)Maximum
power dissipation must be strictly observed to avoid damaging the component.
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Electrical characteristics
2
TS2431
Electrical characteristics
Symbol
Parameter
Test conditions
Min.
VK = VREF, IK = 10
mA
VREF
|ΔVREF|
Reference input
voltage deviation
over temperature
VK = VREF, IK = 10
mA(1)(2)
Temperature
coefficient(2)
TC
Minimum
operating current
IKMIN
Δ𝑉𝑟𝑒𝑓
|
Reference input
voltage
Δ𝑉𝐾
|
Ratio of change in
reference input
voltage to change
in cathode-toanode voltage
Typ.
Max.
Unit
2.5
TS2431 (2%)
2.45
2.55
TS2431A (1%)
2.475
2.525
TS2431B (0.5%)
2.488
2.512
TS2431B (1%), IK
= 1 mA
2.475
2.525
0 °C < T < + 70 °C
10
20
-40 °C < T < + 85
°C
17
30
-40 °C < T < +
105 °C
20
35
-40 °C < T < +
105 °C
50
100
T = 25 °C
0.3
0.8
V
mV
ppm/°C
mA
-40 °C < T < +105
°C
1
IK = 10 mA Vka =
24 to 2.5 V
0.3
2
mV/V
T = 25 °C
0.5
2.5
µA
IREF
Reference input
current IK= 10 mA,
R1 = 10 kΩ, R2 =
+ ∞(3)
|ΔIREF|
Reference input
current deviation
IK = 10 mA, R1 =
10 kΩ, R2 = + ∞(3)
-40 °C < T < +105
°C
0.4
1.2
µA
IOFF
Off-state cathode
current
VK = 24 V, VREF =
GND
10
500
nA
|ZKA|
Reverse dynamic
impedance
VK = VREF, ΔIK = 1
to 50 mA, f < 10
kHz
0.5
0.75
Ω
Wide band noise
IK = 10 mA 10 Hz
< f < 10 kHz
300
EN
-40 °C < T < +105
°C
3
nV/√Hz
Notes:
(1)Limits
are 100 % production tested at 25 °C. Overtemperature limits are guaranteed through correlation and by
design.
(2)|ΔV
REF| is defined as the difference between the maximum and minimum values of V REF obtained over the full
temperature range.
(3)Refer
4/16
to Figure 4: "Test circuit for Vka = Vref".
DocID7961 Rev 6
TS2431
Electrical characteristics
Figure 1: Reference voltage vs temperature
Figure 2: Cathode voltage vs cathode current
Figure 3: Reference input current vs temperature
Figure 4: Test circuit for Vka = Vref
Figure 5: Cathode voltage vs cathode current
Figure 6: Dynamic impedance vs frequency
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Electrical characteristics
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TS2431
Figure 7: Off-state current vs temper
Figure 8: Ratio of change in reference input voltage
to change in Vka voltage vs temperature
Figure 9: Phase and gain vs frequency
Figure 10: Test circuit for off-state current
measurement
DocID7961 Rev 6
TS2431
Electrical characteristics
Figure 11: Test circuit for Vka > Vref
Figure 12: Test circuit for phase and gain
measurement
Figure 13: Pulse response at Ik = 0 to 1 mA
Figure 14: Pulse response at Ik = 1 to 0 mA
Figure 15: Stability boundary conditions
Figure 16: Test circuit for pulse response at Ik = 1
mA
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Electrical characteristics
TS2431
Figure 17: Equivalent input noise vs frequency
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Figure 18: Block diagram
TS2431
3
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK ®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
3.1
SOT23-3L package information
Figure 19: SOT23-3L (Nantong Fujitsu) package outline
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Package information
TS2431
Table 4: SOT23-3L (Nantong Fujitsu) mechanical data
mm
Dim.
Min.
Typ.
A
10/16
Max.
1.25
A1
0
0.15
A2
1
1.10
1.20
A3
0.60
0.65
0.70
b
0.36
b1
0.36
c
0.14
c1
0.14
0.15
0.16
D
2.826
2.926
3.026
E
2.60
2.80
3.00
E1
1.526
1.626
1.726
e
0.90
0.95
1.00
e1
1.80
1.90
2.00
L
0.35
0.45
0.60
0.50
0.38
0.20
L1
0.59 REF
L2
0.25 BSC
R
0.05
R1
0.05
θ
0°
θ1
3°
θ2
6°
DocID7961 Rev 6
0.45
8°
5°
7°
14°
TS2431
Package information
Figure 20: SOT23-3L (Carsem) package outline
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Package information
TS2431
Figure 21: SOT23-3L (Carsem) package section views
12/16
DocID7961 Rev 6
TS2431
Package information
Table 5: SOT23-3L (Carsem) mechanical data
Dimensions
Millimeters
Ref.
Min.
Typ.
Max.
A
0.89
-
1.12
A1
0.013
-
0.10
A2
0.88
0.95
1.02
b
0.37
-
0.50
b1
0.37
0.40
0.45
c
0.085
-
0.18
c1
0.085
-
0.16
D
2.80
2.90
3.04
E
2.10
-
2.64
E1
1.20
1.30
1.40
e
0.95 BSC
e1
1.90 BSC
*L
0.28
0.38
L1
0.48
0.55 REF
L2
R
0.05
R1
0.05
θ
0º
s
0.45
8º
-
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0.60
13/16
Package information
TS2431
Figure 22: SOT23-3L recommended footprint
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TS2431
4
Revision history
Revision history
Table 6: Document revision history
Date
Revision
Changes
01-Feb-2002
1
Initial release.
10-Sep-2009
2
Updated document format. Modified footnote 1 under
Table 2: Absolute maximum ratings on page 3. Added
HBM and MM notes under Table 2.
11-May-2012
3
Removed: automotive grade order codes Table 1 on
page 1.
22-Nov-2012
4
Added min. and max. values test condition TS2431B
(1%), IK = 1 mA Table 4 on page 4.
28-Nov-2016
5
Updated Section 3: "Package information".
Minor text changes.
20-Oct-2017
6
Updated the title and the description in cover page.
Minor text changes.
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TS2431
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2017 STMicroelectronics – All rights reserved
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