TL431N3

CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 1/ 9
Adjustable Precision Shunt Regulators
TL431N3
SOT-23
Description
The TL431N3 series are three-terminal adjustable regulators with guaranteed thermal stability over applicable
temperature range. The output voltage may be set to any value between VREF (approximately 2.495 volts) and 40
volts with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output
circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in
many applications.
Features
• Programmable output voltage
• Temperature coefficient is 50ppm/°C typical
• Temperature compensated for operation over full temperature range
• Low output noise voltage
• Fast turn on response
• Heat Resistance, Soldering iron : 300°C, 5 seconds
• Pb-free lead plating and halogen-free package
Classification
Rank
VREF
A
B
C
AA
2.495±0.5%
2.495±1%
2.495±2%
2.495±0.3%
Ordering Information
Device
TL431N3-XX-T1-G
Package
SOT-23
(Pb-free lead plating and halogen-free package)
Shipping
3000 pcs / tape & reel
Environment friendly grade : S for RoHS compliant products, G for RoHS compliant and
green compound products
Packing spec, T1 : 3000 pcs / tape & reel, 7” reel
Product rank, zero for no rank products
Product name
TL431N3
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 2/ 9
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified)
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Symbol
VKA
IK
IREF
PD
Topr
Tj
Tstg
Value
42
-100~+150
0.05~+10
300
-40~+125
-40~+150
-65~+150
Unit
V
mA
mA
mW
°C
°C
°C
Thermal Characteristics
Symbol
Parameter
Rth,j-c
Rth, j-a
thermal resistance from junction to case
thermal resistance from junction to ambient
Conditions
Value
(Note )
223
417
Unit
℃/W
℃/W
Note : Free air condition
Electrical Characteristics ( Ta=25°C unless otherwise specified )
Characteristics
Symbol
Test Conditions
TL431A
TL431B
Reference Input Voltage
VREF
VKA=VREF, IK=10mA
TL431C
TL431AA
VKA=VREF, IK=10mA
Deviation of Reference Input Voltage
VREF(dev)
Over-Temperature
Tmin≤Ta≤Tmax
IK=10mA,
Ratio of Change in Reference
ΔVREF / ΔVKA=10V-VREF
Input Voltage to the Change in
IK=10mA,
ΔVKA
Cathode Voltage
ΔKKA=36V-10V
IK=10mA, R1=10kΩ,
Reference Input Current
IREF
R2=∞
Deviation of Reference Input Current
IK=10mA, R1=10kΩ,
IREF(dev)
Over Full Temperature Range
R2=∞, Ta=Full Range
Minimum Cathode Current for
IK(min) VKA=VREF
Regulation
Off-State Cathode Current
IK(off)
VKA=42V, VREF=0
VKA=VREF, f≤1.0KHz
Dynamic impedance
ZKA
IK=1 to 100mA
TL431N3
Min
2.483
2.470
2.445
2.487
Typ
2.495
2.495
2.495
2.495
Max
2.507
2.520
2.545
2.502
Unit
-
4
17
mV
-
-1.4
-2.7
mV/V
-
-1.0
-2.0
mV/V
-
1.1
4
uA
-
0.4
1.2
uA
-
0.33
0.5
mA
-
0.17
1.0
uA
-
0.2
0.5
Ω
V
CYStek Product Specification
CYStech Electronics Corp.
Functional Block Diagram
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 3/ 9
& Symbol
Functional Block Diagram :
Symbol :
Cathode
Cathode
Reference
+
-
Reference
VREF
Anode
Anode
Test Circuits
IN
II
VZ
IREF
II
IN
R1
IZ
VREF
Fig1. Test Circuit for VZ=VREF
VZ
IN
VZ
IREF
IZ
R2
VREF
Fig 2. Test Circuit for VZ>VREF
Note : VZ=VREF(1+R1/R2)+IREFxR1
Fig3. Test Circuit for Off-State
Current
Recommended Soldering Footprint
TL431N3
CYStek Product Specification
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 4/ 9
CYStech Electronics Corp.
Characteristic Curves
C ATHODE C UR R ENT vs C ATHODE VOLTAGE
C ATHODE C UR R ENT vs C ATHODE VOLTAGE
150
800
I K - COTHODE CURRENT (μA)
I K - COTHODE CURRENT (mA)
125
100
75
50
25
0
-25
-50
-75
-100
700
600
500
400
300
200
100
0
-100
-200
-2
-1
0
1
2
3
-1
2. 52
0. 5
1
1. 5
2
2. 5
3
5
IKA=10mA
2. 515
IKA =10mA
4
2. 51
Iref - REFERENCE INPUT
CURRENT ( μ A)
2. 505
Vref - REFERENCE INPUT
VOLTAGE (mV)
0
R EF ER ENCE INP UT C UR R ENT vs AMB IENT
TEMP ER ATUR E
R EF ER ENC E INP UT VOLTAGE vs AMB IENT
TEMP ER ATUR E
2. 5
2. 495
2. 49
2. 485
2. 48
-50
-25
0
25
50
75
AMB IENT TEMP ER ATUR E(℃ )
TL431N3
-0. 5
V AK - C ATHODE VOLTAGE ( V)
V A K - C ATHODE VOLTAGE (V)
100
125
3
2
1
0
0
25
50
75
100
125
AMB IENT TEMP ER ATUR E(℃ )
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 5/ 9
Characteristic Curves(Cont.)
DYNAMIC IMP EDANC E vs F R EQUENC E
C ATHODE VOLTAGE vs R EF ER ENC E INP UT
VOLTAGE
10
Z KA - DYNAMIC IMPEDANCE (Ω)
0
-5
ΔVref - REFERENCE INPUT
VOLTAGE (mV)
-10
-15
-20
-25
IKA =10mA
1
0. 1
-30
0
5
10
15
20
25
30
35
1
40
V KA - C ATHODE VOLTAGE (V)
100
1000
f - F REQUENCE (KHz )
Po wer Der atin g C u r v e
OP EN-LOOP VOLTAGE GAIN vs F R EQUENC Y
350
Po wer Dissip atio n - - - P D ( mW )
40
OPEN-LOOP VOLTAGE GAIN (dB)
10
30
20
10
IKA =10mA
300
250
200
150
100
50
0
0
1
10
100
f - F R EQUENC Y (KHz )
TL431N3
1000
0
50
100
150
200
Am b ien t Tem p er atu r e- - - TA( ℃)
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 6/ 9
Typical Characteristics(Cont.)
Stability Boundary Conditions
100
VKA=10V
Cathode Current---IK(mA)
90
80
70
VKA=VREF
60
VKA=5V
Stability
Region
50
40
Stability
Region
30
20
10
0
0.001
TA=25°C
VKA=15V, no
oscillation
0.01
0.1
1
10
Loa d C a pa c i t a nc e ---C L(uF )
Test Circuit for Stability Boundary Conditions
VKA=VREF
VKA=5V, 10V, 15V
※ CL : MLCC capacitor
TL431N3
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 7/ 9
Reel Dimension
Carrier Tape Dimension
TL431N3
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 8/ 9
Recommended wave soldering condition
Product
Pb-free devices
Peak Temperature
260 +0/-5 °C
Soldering Time
5 +1/-1 seconds
Recommended temperature profile for IR reflow
Profile feature
Average ramp-up rate
(Tsmax to Tp)
Preheat
−Temperature Min(TS min)
−Temperature Max(TS max)
−Time(ts min to ts max)
Time maintained above:
−Temperature (TL)
− Time (tL)
Peak Temperature(TP)
Time within 5°C of actual peak
temperature(tp)
Ramp down rate
Time 25 °C to peak temperature
Sn-Pb eutectic Assembly
Pb-free Assembly
3°C/second max.
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
183°C
60-150 seconds
240 +0/-5 °C
217°C
60-150 seconds
260 +0/-5 °C
10-30 seconds
20-40 seconds
6°C/second max.
6 minutes max.
6°C/second max.
8 minutes max.
Note : All temperatures refer to topside of the package, measured on the package body surface.
TL431N3
CYStek Product Specification
Spec. No. : C502N3
Issued Date : 2003.04.02
Revised Date : 2015.04.13
Page No. : 9/ 9
CYStech Electronics Corp.
SOT-23 Dimension
Marking:
431
3-Lead SOT-23 Plastic
Surface Mounted Package
CYStek Package Code: N3
Style:
Inches
Min.
Max.
0.1102 0.1204
0.0472 0.0669
0.0335 0.0512
0.0118 0.0197
0.0669 0.0910
0.0000 0.0040
DIM
A
B
C
D
G
H
Millimeters
Min.
Max.
2.80
3.04
1.20
1.70
0.89
1.30
0.30
0.50
1.70
2.30
0.00
0.10
DIM
J
K
L
S
V
L1
Pin
1.Reference
3.Anode
Inches
Min.
Max.
0.0032 0.0079
0.0118 0.0266
0.0335 0.0453
0.0830 0.1161
0.0098 0.0256
0.0118 0.0197
2.Cathode
Millimeters
Min.
Max.
0.08
0.20
0.30
0.67
0.85
1.15
2.10
2.95
0.25
0.65
0.30
0.50
Notes: 1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYCtek sales office.
Material:
• Lead: Pure tin plated.
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0.
Important Notice:
• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
• CYStek reserves the right to make changes to its products without notice.
• CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
• CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
TL431N3
CYStek Product Specification