1
Publication Order Number:
TLV431A/D
Semiconductor Components Industries, LLC, 2005
January, 2005 - Rev. 7
TLV431A, TLV431B
Low Voltage Precision
Adjustable Shunt Regulator
The TLV431A and B series are precision low voltage shunt
regulators that are programmable over a wide voltage range of 1.24 V
to 16 V. The TLV431A series features a guaranteed reference accuracy
of
1.0% at 25C and 2.0% over the entire industrial temperature
range of -40
C to 85C. For TLV431B series, the accuracy is even
higher, it's
0.5% and 1.0% respectively. These devices exhibit a
sharp low current turn-on characteristic with a low dynamic
impedance of 0.20
W over an operating current range of 100 mA to
20 mA. This combination of features makes this series an excellent
replacement for zener diodes in numerous applications circuits that
require a precise reference voltage. When combined with an
optocoupler, the TLV431A/B can be used as an error amplifier for
controlling the feedback loop in isolated low output voltage (3.0 V to
3.3 V) switching power supplies. These devices are available in
e c o n o m i c a l TO -9 2 -3 a n d m i c r o s i z e T S O P-5 a n d
SOT-23-3 packages.
Features
Programmable Output Voltage Range of 1.24 V to 16 V
Voltage Reference Tolerance
"1.0% for A Series and
"0.5% for B Series
Sharp Low Current Turn-On Characteristic
Low Dynamic Output Impedance of 0.20
W from 100 mA to 20 mA
Wide Operating Current Range of 50
mA to 20 mA
Micro Miniature TSOP-5, SOT-23-3 and TO-92-3 Packages
Pb-Free Packages are Available
Applications
Low Output Voltage (3.0 V to 3.3 V) Switching Power Supply
Error Amplifier
Adjustable Voltage or Current Linear and Switching Power Supplies
Voltage Monitoring
Current Source and Sink Circuits
Analog and Digital Circuits Requiring Precision References
Low Voltage Zener Diode Replacements
-
+
1.24 V
ref
Reference (R)
Cathode (K)
Anode (A)
Figure 1. Representative Block Diagram
TO-92-3-3
LP SUFFIX
CASE 29
1
2
3
TSOP-5
SN SUFFIX
CASE 483
1 2
3
5
4
SOT-23-3
SN1 SUFFIX
CASE 318
1
2
3
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
AND PIN CONNECTIONS
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TLV431A, TLV431B
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2
Reference (R)
Cathode (K)
Anode (A)
Anode (A)
Reference (R)
Cathode (K)
The device contains 13 active transistors.
Device Symbol
Figure 2. Representative Device Symbol and Schematic Diagram
MAXIMUM RATINGS
(Full operating ambient temperature range applies, unless otherwise noted)
Rating
Symbol
Value
Unit
Cathode to Anode Voltage
V
KA
18
V
Cathode Current Range, Continuous
I
K
-20 to 25
mA
Reference Input Current Range, Continuous
I
ref
*0.05 to 10
mA
Thermal Characteristics
LP Suffix Package, TO-92-3 Package
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
SN Suffix Package, TSOP-5 Package
Thermal Resistance, Junction-to-Ambient
SN1 Suffix Package, SOT-23-3 Package
Thermal Resistance, Junction-to-Ambient
R
qJA
R
qJC
R
qJA
R
qJA
178
83
226
491
C/W
Operating Junction Temperature
T
J
150
C
Operating Ambient Temperature Range
T
A
*40 to 85
C
Storage Temperature Range
T
stg
*65 to 150
C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL-STD-883,
Method 3015. Machine Model Method 200 V.
PD +
TJ(max) * TA
RqJA
RECOMMENDED OPERATING CONDITIONS
Condition
Symbol
Min
Max
Unit
Cathode to Anode Voltage
V
KA
V
ref
16
V
Cathode Current
I
K
0.1
20
mA
TLV431A, TLV431B
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3
ELECTRICAL CHARACTERISTICS
(T
A
= 25C unless otherwise noted)
TLV431A
TLV431B
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
Reference Voltage (Figure 3)
(V
KA
= V
ref
, I
K
= 10 mA, T
A
= 25C)
(T
A
= T
low
to T
high
, Note 1)
V
ref
1.228
1.215
1.240
-
1.252
1.265
1.234
1.228
1.240
-
1.246
1.252
V
Reference Input Voltage Deviation Over Temperature (Figure 3)
(V
KA
= V
ref
, I
K
= 10 mA, T
A
= T
low
to T
high
, Note 1)
DV
ref
-
7.2
20
-
7.2
20
mV
Ration of Reference Input Voltage Change to Cathode Voltage
Change (Figure 4)
(V
KA
= V
ref
to 16 V, I
K
= 10 mA)
DV
ref
DV
KA
-
-0.6
-1.5
-
-0.6
-1.5
mV
V
Reference Terminal Current (Figure 4)
(I
K
= 10 mA, R1 = 10 kW, R2 = open)
I
ref
-
0.15
0.3
-
0.15
0.3
mA
Reference Input Current Deviation Over Temperature (Figure 4)
(I
K
= 10 mA, R1 = 10 kW, R2 = open, Notes 1, 2)
DI
ref
-
0.04
0.08
-
0.04
0.08
mA
Minimum Cathode Current for Regulation (Figure 3)
I
K(min
)
-
55
80
-
55
80
mA
Off-State Cathode Current (Figure 5)
(V
KA
= 6.0 V, V
ref
= 0)
(V
KA
= 16 V, V
ref
= 0)
I
K(off)
-
-
0.01
0.012
0.04
0.05
-
-
0.01
0.012
0.04
0.05
mA
Dynamic Impedance (Figure 3)
(V
KA
= V
ref
, I
K
=0.1 mA to 20 mA, f 1.0 kHz, Note 3)
|Z
KA
|
-
0.25
0.4
-
0.25
0.4
W
1. Ambient temperature range: T
low
= *40C, T
high
= 85C.
2. The deviation parameters DV
ref
and DI
ref
are defined as the difference between the maximum value and minimum value obtained over the
full operating ambient temperature range that applied.
V
ref
Max
V
ref
Min
T
1
T
2
Ambient Temperature
DV
ref
= V
ref
Max - V
ref
Min
DT
A
= T
2
- T
1
The average temperature coefficient of the reference input voltage, aV
ref
is defined as:
Vref
ppm
C +
(DVref)
Vref (TA+ 25C)
10
6
DTA
aV
ref
can be positive or negative depending on whether V
ref
Min or V
ref
Max occurs at the lower ambient temperature, refer to Figure 8.
Example: DV
ref
= 7.2 mV and the slope is positive,
Example:
V
ref
@ 25C = 1.241 V
Example:
DT
A
= 125C
Vref
ppm
C +
0.0072
1.241
125
+ 46 ppm C
10
6
3. The dynamic impedance Z
KA
is defined as:
ZKA +
DVKA
DI
K
When the device is operating with two external resistors, R1 and R2, (refer to Figure 4) the total dynamic impedance of the circuit is given by:
ZKA + ZKA 1 )
R1
R2
TLV431A, TLV431B
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4
Figure 3. Test Circuit
for V
KA
= V
ref
Figure 4. Test Circuit
for V
KA
u V
ref
Figure 5. Test Circuit
for I
K(off)
I
K
Input
V
KA
V
ref
I
K(off)
Input
V
KA
I
K
Input
V
KA
V
ref
I
ref
R2
R1
V
KA
+ V
ref
1
) R1
R2
) I
ref S
R1
Vref
(min)
Vref
(typ)
Figure 6. Cathode Current vs. Cathode Voltage
Figure 7. Cathode Current vs. Cathode Voltage
Figure 8. Reference Input Voltage versus
Ambient Temperature
Figure 9. Reference Input Current versus
Ambient Temperature
V
KA
, CATHODE VOLTAGE (V)
30
20
10
0
2.0
1.5
1.0
0.5
0
-0.5
-1.0
I K
, CA
THODE CURRENT
(mA)
V
KA
, CATHODE VOLTAGE (V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
90
70
50
30
10
-10
-30
I K
, CA
THODE CURRENT
(
A)
-10
110
m
T
A
, AMBIENT TEMPERATURE (C)
1.25
1.23
35
10
-15
-40
V
ref
, REFERENCE INPUT
VOL
T
AGE (V)
T
A
, AMBIENT TEMPERATURE (C)
85
60
35
10
-15
-40
0.14
0.13
0.12
I ref
, REFERENCE INPUT
CURRENT
(
A)
1.22
0.15
85
60
1.24
I
K
Input
V
KA
V
KA
= V
ref
T
A
= 25C
I
K
Input
V
KA
V
KA
= V
ref
T
A
= 25C
I
K
Input
V
KA
I
K
= 10 mA
10 k
I
ref
V
KA
= V
ref
I
K
= 10 mA
Input
IK
VKA
Vref
(max)
m
I
K(min)
TLV431A Typ.
TLV431A, TLV431B
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5
Figure 10. Reference Input Voltage Change
versus Cathode Voltage
Figure 11. Off-State Cathode Current
versus Cathode Voltage
Figure 12. Off-State Cathode Current versus
Ambient Temperature
Figure 13. Dynamic Impedance versus
Frequency
Figure 14. Dynamic Impedance versus
Ambient Temperature
Figure 15. Open-Loop Voltage Gain
versus Frequency
V
KA
, CATHODE VOLTAGE (V)
0
-2.0
-6.0
-8.0
12
8.0
4.0
0
V
ref
, REFERENCE INPUT
VOL
T
AGE CHANGE (mV)
V
KA
, CATHODE VOLTAGE (V)
20
12
8.0
4.0
0
3.0
2.0
1.0
0
I K(off)
, CA
THODE CURRENT
(
A)
-10
4.0
m
D
-4.0
16
T
A
, AMBIENT TEMPERATURE (C)
0.4
0.3
35
10
-15
-40
I of
f, OFF-ST
A
TE CA
THODE CURRENT
(
A)
f, FREQUENCY (Hz)
10 M
10 k
1.0 k
0.1
|
,
DYNAMIC IMPEDANCE (OHM)
0
10
0.1
100 k
1.0 M
60
85
1.0
Za
|
T
A
, AMBIENT TEMPERATURE (C)
0.23
0.21
0.20
35
10
-15
-40
|Za|, DYNAMIC IMPEDANCE (OHM)
f, FREQUENCY (Hz)
1.0 M
1.0 k
100
50
40
30
20
10
0
A
vol
, OPEN LOOP
VOL
T
AGE GAIN (dB)
0.19
60
0.22
10 k
100 k
85
60
0.24
I
off
Input
V
KA
V
KA
= 16 V
V
ref
= 0 V
I
off
Input
V
KA
V
KA
= 16 V
V
ref
= 0 V
I
K
Input
V
KA
R1
R2 V
ref
8.25 k
15 k
IK
230
Output
9 F
m
50
+
-
Output
IK
+
-
I
K
= 10 mA
T
A
= 25C
I
K
= 0.1 mA to 20 mA
T
A
= 25C
I
K
= 10 mA
T
A
= 25C
m
0.2
I
K
= 0.1 mA to 20 mA
f = 1.0 kHz
50
+
-
Output
I K
T
A
= 25C
16
TLV431A, TLV431B
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6
T
A
= 25C
C
L
, LOAD CAPACITANCE
10
pF
100
pF
20
15
10
5.0
0
I K
, CA
THODE CURRENT
(mA)
25
1.0
nF
0.01
mF
0.1
mF
100
mF
1.0
mF
10
mF
C
A
B
D
Stable
Stable
Stable
Figure 16. Spectral Noise Density
Figure 17. Pulse Response
f, FREQUENCY (Hz)
350
275
10 k
1.0 k
100
10
NOISE VOL
T
AGE (nV/
250
300
100 k
325
Figure 18. Stability Boundary Conditions
I
K
V
KA
= V
ref
I
K
= 10 mA
T
A
= 25C
I
ref
Input
Output
50
Pulse
Generator f = 100 kHz
Output
Input
Hz)
Figure 19. Test Circuit for Figure 18
C
L
I
K
1.0 k
V+
Output
Input
1.8 k
0
2.0
4.0
6.0
8.0
10.0
0
2.0
0
0.5
(VOL
TS)
1.0
1.5
t, TIME (ms)
T
A
= 25C
W
1.0
3.0
5.0
7.0
9.0
Unstable
Regions
V
KA
(V)
R1
(kW)
A, C
V
ref
B, D
5.0
0
30.4
R2
R1
R2
(kW)
10
Stability
Figures 18 and 19 show the stability boundaries and
circuit configurations for the worst case conditions with the
load capacitance mounted as close as possible to the device.
The required load capacitance for stable operation can vary
depending on the operating temperature and capacitor
equivalent series resistance (ESR). Ceramic or tantalum
surface mount capacitors are recommended for both
temperature and ESR. The application circuit stability
should be verified over the anticipated operating current and
temperature ranges.
TLV431A, TLV431B
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7
Figure 20. Shunt Regulator
Figure 21. High Current Shunt Regulator
Vout + 1 )
R1
R2
Vref
Vout + 1 )
R1
R2
Vref
R1
R2
V
out
V
in
R1
R2
V
out
V
in
TYPICAL APPLICATIONS
Figure 22. Output Control for a Three Terminal
Fixed Regulator
Figure 23. Series Pass Regulator
Vout + 1 )
R1
R2
Vref
Vout(min) + Vref ) 5.0 V
Vout + 1 )
R1
R2
Vref
Vout(min) + Vref ) Vbe [ 2.0 V
V
in
V
out
R1
R2
V
in
V
out
R1
R2
Out
In
MC7805
Common
TLV431A, TLV431B
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8
Figure 24. Constant Current Source
Figure 25. Constant Current Sink
Iout +
Vref
RCL
Isink +
Vref
RS
Figure 26. TRIAC Crowbar
Vout(trip) + 1 )
R1
R2
Vref
Figure 27. SCR Crowbar
Vout(trip) + 1 )
R1
R2
Vref
V
in
V
out
R
CL
V
in
R
S
I
sink
V
in
V
out
R2
V
in
V
out
R1
R2
R1
I
out
TLV431A, TLV431B
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9
Figure 28. Voltage Monitor
Figure 29. Single-Supply Comparator with
Temperature-Compensated Threshold
Figure 30. Linear Ohmmeter
Figure 31. Simple 400 mW Phono Amplifier
Lower limit + 1 ) R1
R2
Vref
L.E.D. indicator is `ON' when V
in
is
between the upper and lower limits,
Upper limit + 1 ) R3
R4
Vref
V
in
V
out
tV
ref
V+
0.74 V
uV
ref
LED
R1
R2
R3
R4
V
in
V+
V
out
V
in
10 k
Calibrate
-
+
25 V
-5.0 V
V
out
25 V
2.0 mA
5 k
1%
50 k
1%
1.0 M
1%
Range
R
x
1N5305
1.0 kW
V
1.0 MW
V
10 kW
V
500 k
1%
100 kW
V
360 k
56 k
10 k
330
T1
8.0 W
38 V
470 mF
1.0 mF
0.05 mF
+
25 k
Volume
47 k
T1 = 330 W to 8.0 W
Rx + Vout D
W
V
Range
* Thermalloy
*
THM 6024
*
Heatsink on
*
LP Package.
*
Tone
TLV431A, TLV431B
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10
Figure 32. Isolated Output Line Powered Switching Power Supply
The above circuit shows the TLV431A/B as a compensated amplifier controlling the feedback loop of an isolated output line
powered switching regulator. The output voltage is programmed to 3.3 V by the resistors values selected for R1 and R2. The
minimum output voltage that can be programmed with this circuit is 2.64 V, and is limited by the sum of the reference voltage
(1.24 V) and the forward drop of the optocoupler light emitting diode (1.4 V). Capacitor C1 provides loop compensation.
Gate Drive
V
CC
Controller
V
FB
GND
Current
Sense
DC Output
3.3 V
R1
3.0 k
R2
1.8 k
100
AC Input
C1
0.1 mF
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11
Anode
Reference
NC
NC
Cathode
5
4
1
2
3
XXXYW
TLV43
1XXX
ALYWW
PIN CONNECTIONS AND DEVICE MARKING
(Top View)
1 2 3
Cathode
Anode
Reference
1
2
3
XXX
(Top View)
XXX
= Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
WW, W = Work Week
1. Reference
2. Anode
3. Cathode
TO-92
TSOP-5
SOT-23-3
ORDERING INFORMATION
Device
Device Code
Package
Shipping
TLV431ALP
ALP
TO-92-3
6000/Box
TLV431ALPG
ALP
TO-92-3
(Pb-Free)
6000/Box
TLV431ALPRA
ALP
TO-92-3
2000/Tape & Reel
TLV431ALPRAG
ALP
TO-92-3
(Pb-Free)
2000/Tape & Reel
TLV431ALPRE
ALP
TO-92-3
2000/Tape & Reel
TLV431ALPREG
ALP
TO-92-3
(Pb-Free)
2000/Tape & Reel
TLV431ALPRM
ALP
TO-92-3
2000/Ammo Pack
TLV431ALPRP
ALP
TO-92-3
2000/Ammo Pack
TLV431ALPRPG
ALP
TO-92-3
(Pb-Free)
2000/Ammo Pack
TLV431ASNT1
RAA
TSOP-5
3000/Tape & Reel
TLV431ASNT1G
RAA
TSOP-5
(Pb-Free)
3000/Tape & Reel
TLV431ASN1T1
RAF
SOT-23-3
3000/Tape & Reel
TLV431ASN1T1G
RAF
SOT-23-3
(Pb-Free)
3000/Tape & Reel
TLV431BLP
BLP
TO-92-3
6000/Box
TLV431BLPRA
BLP
TO-92-3
2000/Tape & Reel
TLV431BLPRAG
BLP
TO-92-3
(Pb-Free)
2000/Tape & Reel
TLV431BLPRE
BLP
TO-92-3
2000/Tape & Reel
TLV431BLPRM
BLP
TO-92-3
2000/Ammo Pack
TLV431BLPRP
BLP
TO-92-3
2000/Ammo Pack
TLV431BSNT1
RAH
TSOP-5
3000/Tape & Reel
TLV431BSNT1G
RAH
TSOP-5
(Pb-Free)
3000/Tape & Reel
TLV431BSN1T1
RAG
SOT-23-3
3000/Tape & Reel
TLV431BSN1T1G
RAG
SOT-23-3
(Pb-Free)
3000/Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
TLV431A, TLV431B
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12
PACKAGE DIMENSIONS
TO-92-3
LP SUFFIX
CASE 29-11
ISSUE AL
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. CONTOUR OF PACKAGE BEYOND DIMENSION R
IS UNCONTROLLED.
4. LEAD DIMENSION IS UNCONTROLLED IN P AND
BEYOND DIMENSION K MINIMUM.
R
A
P
J
L
B
K
G
H
SECTION X-X
C
V
D
N
N
X X
SEATING
PLANE
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.175
0.205
4.45
5.20
B
0.170
0.210
4.32
5.33
C
0.125
0.165
3.18
4.19
D
0.016
0.021
0.407
0.533
G
0.045
0.055
1.15
1.39
H
0.095
0.105
2.42
2.66
J
0.015
0.020
0.39
0.50
K
0.500
---
12.70
---
L
0.250
---
6.35
---
N
0.080
0.105
2.04
2.66
P
---
0.100
---
2.54
R
0.115
---
2.93
---
V
0.135
---
3.43
---
1
TLV431A, TLV431B
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13
PACKAGE DIMENSIONS
TSOP-5
SN SUFFIX
CASE 483-02
ISSUE C
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES
LEAD FINISH THICKNESS. MINIMUM LEAD
THICKNESS IS THE MINIMUM THICKNESS
OF BASE MATERIAL.
4. A AND B DIMENSIONS DO NOT INCLUDE
MOLD FLASH, PROTRUSIONS, OR GATE
BURRS.
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
2.90
3.10 0.1142 0.1220
B
1.30
1.70 0.0512 0.0669
C
0.90
1.10 0.0354 0.0433
D
0.25
0.50 0.0098 0.0197
G
0.85
1.05 0.0335 0.0413
H
0.013
0.100 0.0005 0.0040
J
0.10
0.26 0.0040 0.0102
K
0.20
0.60 0.0079 0.0236
L
1.25
1.55 0.0493 0.0610
M
0
10
0
10
S
2.50
3.00 0.0985 0.1181
0.05 (0.002)
1
2
3
5
4
S
A
G
L
B
D
H
C
K
M
J
_
_
_
_
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
TSOP-5
0.7
0.028
1.0
0.039
0.95
0.037
2.4
0.094
1.9
0.074
TLV431A, TLV431B
http://onsemi.com
14
PACKAGE DIMENSIONS
SOT-23-3
SN1 SUFFIX
CASE 318-09
ISSUE AK
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
mm
inches
SCALE 10:1
0.8
0.031
0.9
0.035
0.95
0.037
0.95
0.037
SOT-23-3
2.0
0.079
D
J
K
L
A
C
B S
H
G
V
3
1
2
DIM
A
MIN
MAX
MIN
MAX
MILLIMETERS
0.1102
0.1197
2.80
3.04
INCHES
B
0.0472
0.0551
1.20
1.40
C
0.0350
0.0440
0.89
1.11
D
0.0150
0.0200
0.37
0.50
G
0.0701
0.0807
1.78
2.04
H
0.0005
0.0040
0.013
0.100
J
0.0034
0.0070
0.085
0.177
K
0.0140
0.0285
0.35
0.69
L
0.0350
0.0401
0.89
1.02
S
0.0830
0.1039
2.10
2.64
V
0.0177
0.0236
0.45
0.60
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD
FINISH THICKNESS. MINIMUM LEAD
THICKNESS IS THE MINIMUM THICKNESS OF
BASE MATERIAL.
4. 318-01 THRU -07 AND -09 OBSOLETE, NEW
STANDARD 318-08.
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