MCC
omponents
20736 Marilla Street Chatsworth
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TM
Micro Commercial Components
Features
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TL431BU
Lead Free Finish/RoHS Compliant ("P" Suffix designates
RoHS Compliant. See ordering information)
Epoxy meets UL 94 V-0 flammability rating
Moisure Sensitivity Level 1
Programmable Output Voltage 36V
Sink Current Capability of 0.1mA to 100 mA
Temperature Compensated for operation over full rated operating
temperature range
Low output noise voltage and Fast turn on response
The Reference Input Voltage tolerance is 0.5%
Marking Code: 431
Programmable
Precision Regulator
SOT-23
A
D
Maximum Ratings
1
Parameter
Symbol
Value
Unit
VKA
IK
IREF
PD
RθJA
Topr
TSTG
37
-100~150
0.05~10
0.2
300
0---70
-55---+150
V
mA
mA
W
к/W
к
к
Cathode Voltage
Cathode Current Range
Reference Input Current Range
Power Dissipation at 25к
Thermal Resistance Junction to Ambient
Operating Temperature
Storage Temperature Range
Recommended Operating Conditions
Parameter
Cathode Voltage
Cathode Current Range
Sym
VKA
IK
Min
VREF
1.0
Max
36
100
Unit
V
mA
Dynamic Impedance
Revision: A
Sym
Min
Typ
Max
Test conditions
Vref
2.487V
2.500V
2.512V
VKA=VREF, IKA=10mA
3.0mV
17mV
-1.4
-2.7
-1.0
-2.0
ϦʳVKA=36VД10V
4.0µA
IKA=10mA,
R1=10KӨʿ R2=Ќ
IKA=10mA,
R1=10KӨʿ R2=Ќʳ
TA=full Temperature
Vref(dev)
ϦVref/
ϦVKA
Iref
1.8µA
F
B
3
E
1. (A) ANODE
2. (R) REFERENCE
3. (K) CATHODE
H
G
J
K
Electrical Characteristics @ 25°C Unless Otherwise Specified
Parameter
Reference Input
Voltage
Deviation of
reference input
voltage
Ratio of Change in
Reference Input
Voltage to the
Change in Cathode
Voltage
Reference Input
Current
Deviation of
Reference Input
Current Over Full
Temperature Range
Minimum Cathode
Current for
Regulation
Off-State Cathode
Current
C
2
VKA=VREF, IKA=10mA
TminЉTaЉTmax
ϦVKA=10VДVref
ϦIref/
ϦT
0.4µA
1.2µA
IKA(min)
0. 5mA
1.0mA
IKA(off)
0.26µA
1.0µA
VKA=36V, VREF=0V
ZKA
0.22Ө
0.5Ө
IKA=10 to 100mA,
fЉ1.0KHz
DIMENSIONS
DIM
A
B
C
D
E
F
G
H
J
K
INCHES
MIN
.110
.083
.047
.035
.070
.018
.0005
.035
.003
.015
MM
MAX
.120
.098
.055
.041
.081
.024
.0039
.044
.007
.020
MAX
3.04
2.64
1.40
1.03
2.05
.60
.100
1.12
.180
.51
NOTE
Suggested Solder
Pad Layout
.031
.800
.035
.900
.079
2.000
inches
mm
.037
.950
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MIN
2.80
2.10
1.20
.89
1.78
.45
.013
.89
.085
.37
.037
.950
2011/01/01
MCC
TM
Micro Commercial Components
TL431BU
Input
Input
VKA
IK
VKA
Iref
R1
Vref
R2
Input
Ioff
IK
V
KA
+V
VKA
Ǔ
ǒ
Ă Ă1 ) R1Ă ) I ĂSĂR1
ref
R2
ref
Vref
150
800
VKA = Vref
TA = 25°C
100
Input
IK
IK , CATHODE CURRENT ( µA)
IK , CATHODE CURRENT (mA)
Figure 3. Test Circuit for Ioff
Figure 2. Test Circuit for VKA > Vref
Figure 1. Test Circuit for VKA = Vref
VKA
50
0
-50
-100
-2.0
-1.0
0
1.0
2.0
VKA = Vref
TA = 25°C
600 Input
400
200
0
-200
-1.0
3.0
0
VKA
IK VKA = Vref
IK = 10 mA
Input
2560
Vref
Vref Max = 2525mV
2540
2520
Vref Typ = 2500mV
2500
2480
2460
Vref Min = 2475mV
2440
2420
2400
-55
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
3.0
3.0
2.5
2.0
1.5
IK = 10 mA
1.0
Input
10k Iref
IK
VKA
0.5
0
-55
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
Figure 6. Reference Input Voltage versus
Ambient Temperature
Revision: A
2.0
Figure 5. Cathode Current versus
Cathode Voltage
Iref , REFERENCE INPUT CURRENT ( µA)
Vref , REFERENCE INPUT VOLTAGE (mV)
Figure 4. Cathode Current versus
Cathode Voltage
2580
1.0
VKA, CATHODE VOLTAGE (V)
VKA, CATHODE VOLTAGE (V)
2600
IMin
VKA
IK
Figure 7. Reference Input Current versus
Ambient Temperature
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MCC
TM
0
IK = 10 mA
TA = 25°C
-8.0
-16
Input
VKA
IK
R1
-24
-32
R2
Vref
0
10
20
1.0 k
Ioff , OFF-STATE CATHODE CURRENT (nA)
∆ Vref , REFERENCE INPUT VOLTAGE (mV)
Micro Commercial Components
100
10
1.0
Input
0.01
-55
-25
VKA, CATHODE VOLTAGE (V)
50
10
+
Gnd
1.0
0.1
1.0 k
10 k
100 k
1.0 M
0.280
0.260
75
100
125
0.240
0.220
0.200
-55
10 M
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (_C)
Figure 10. Dynamic Impedance
versus Frequency
Figure 11. Dynamic Impedance
versus Ambient Temperature
80
60
50
9.0 µF
40
IK
15Ăk
Output
230
NOISE VOLTAGE (nV/ √Hz)
A VOL, OPEN LOOP VOLTAGE GAIN (dB)
50
VKA = Vref
∆ IK = 1.0 mA to 100 mA
f ≤ 1.0 kHz
Output
1.0Ăk
IK
50
+
Gnd
0.300
f, FREQUENCY (MHz)
8.25Ăk
Gnd
30
20
10
25
0.320
TA = 25_C
∆ IK = 1.0 mA to 100 mA
Output
IK
0
Figure 9. Off–State Cathode Current
versus Ambient Temperature
|ZKA|, DYNAMIC IMPEDANCE (Ω )
|ZKA|, DYNAMIC IMPEDANCE (Ω )
1.0 k
VKA
TA, AMBIENT TEMPERATURE (5C)
Figure 8. Change in Reference Input
Voltage versus Cathode Voltage
100
Ioff
0.1
40
30
VKA = 36 V
Vref = 0 V
IK = 10 mA
TA = 25_C
60
40
Input
VKA = Vref
IK = 10 mA
TA = 25°C
20
Output
IK
0
-10
1.0 k
10 k
100 k
1.0 M
0
10
10 M
Figure 12. Open–Loop Voltage Gain
versus Frequency
Revision: A
100
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
f, FREQUENCY (MHz)
Figure 13. Spectral Noise Density
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MCC
TM
Micro Commercial Components
Ordering Information :
Device
Packing
Tape&Reel;3Kpcs/Reel
Part Number-TP
***IMPORTANT NOTICE***
Micro Commercial Components Corp. reserves the right to make changes without further notice to any product herein to
make corrections, modifications , enhancements , improvements , or other changes . Micro Commercial Components
Corp . does not assume any liability arising out of the application or use of any product described herein; neither does it
convey any license under its patent rights ,nor the rights of others . The user of products in such applications shall assume all
risks of such use and will agree to hold Micro Commercial Components Corp . and all the companies whose products are
represented on our website, harmless against all damages.
***LIFE SUPPORT***
MCC's products are not authorized for use as critical components in life support devices or systems without the express written
approval of Micro Commercial Components Corporation.
***CUSTOMER AWARENESS***
Counterfeiting of semiconductor parts is a growing problem in the industry. Micro Commercial Components (MCC) is taking
strong measures to protect ourselves and our customers from the proliferation of counterfeit parts. MCC strongly encourages
customers to purchase MCC parts either directly from MCC or from Authorized MCC Distributors who are listed by country on
our web page cited below. Products customers buy either from MCC directly or from Authorized MCC Distributors are genuine
parts, have full traceability, meet MCC's quality standards for handling and storage. MCC will not provide any warranty
coverage or other assistance for parts bought from Unauthorized Sources. MCC is committed to combat this global
problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized
distributors.
Revision: A
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