LM129/LM329
6.9V Precision
Voltage Reference
FeaTures
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DescripTion
The
LM
®
329
temperature compensated 6.9V Zener
references provide excellent stability over time and
temperature, very low dynamic impedance and a wide
operating current range. The device achieves low dynamic
impedance by incorporating a high gain shunt regulator
around the Zener. The excellent noise performance of the
device is achieved by using a “buried Zener” design which
eliminates surface noise phenomenon associated with
ordinary Zeners. To serve a wide variety of applications,
the LM129 is available in several temperature coefficient
grades and two package styles. A 20mA positive current
source application is shown below.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Guaranteed
10ppm/°C Temperature Coefficient
Guaranteed
1Ω Maximum Dynamic Impedance
Guaranteed
20µV Maximum Wideband Noise
Wide Operating Current Range: 0.6mA to 15mA
applicaTions
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Transducers
A/D and D/A Converters
Calibration Standards
Instrumentation Reference
Typical applicaTion
20mA Positive Current Source
20V
REVERSE VOLTAGE CHANGE (mV)
20k
0.1%
2
7
LT1001
6
174
0.1%
8
7
6
5
4
3
2
1
0
0
2
8
6
REVERSE CURRENT (mA)
4
10
129329 TA01b
Reverse Voltage Change
T
A
= 25°C
LM329
6.95V
–
+
3
20k
0.1%
4
10k
OUT
20mA
129329 TA01
4.3k
129329fd
For more information
www.linear.com/LM329
1
LM129/LM329
absoluTe MaxiMuM raTings
(Note 1)
Operating Temperature Range
LM129 (OBSOLETE) .......................... –55°C to 125°C
LM329 ..................................................... 0°C to 70°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
Reverse-Breakdown Current ..................................30mA
Forward Current .......................................................2mA
pin conFiguraTion
BOTTOM VIEW
BOTTOM VIEW
H PACKAGE
2-LEAD TO-46 METAL CAN
T
JMAX
= 150°C,
q
JA
= 440°C/W,
q
JC
= 80°C/W
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 150°C,
q
JA
= 160°C/W
Consider the Z Package for Alternate Source
OBSOLETE PACKAGE
orDer inForMaTion
LEAD FREE FINISH
LM129AH#PBF
LM129BH#PBF
LM129CH#PBF
LM329AH#PBF
LM329BH#PBF
LM329CH#PBF
LM329DH#PBF
LM329AZ#PBF
LM329BZ#PBF
LM329CZ#PBF
LM329DZ#PBF
TAPE AND REEL
LM129AH#TRPBF
LM129BH#TRPBF
LM129CH#TRPBF
LM329AH#TRPBF
LM329BH#TRPBF
LM329CH#TRPBF
LM329DH#TRPBF
LM329AZ#TRPBF
LM329BZ#TRPBF
LM329CZ#TRPBF
LM329DZ#TRPBF
PART MARKING
LM129AH
LM129BH
LM129CH
LM329AH
LM329BH
LM329CH
LM329DH
LM329BZ
LM329BZ
LM329BZ
LM329BZ
PACKAGE DESCRIPTION
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
2-Lead Plastic TO-46 Metal Can
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
TEMPERATURE RANGE
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
129329fd
For more information
www.linear.com/LM329
LM129/LM329
elecTrical characTerisTics
SYMBOL
V
Z
∆V
Z
∆I
R
∆V
Z
∆Temp
PARAMETER
Reverse-Breakdown Voltage
Reverse-Breakdown Voltage
Change with Current
Temperature Coefficient
CONDITIONS
T
A
= 25°C, 0.6mA ≤ I
R
≤ 15mA
T
A
= 25°C, 0.6mA ≤ I
R
≤ 15mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA,
LM129A/LM329A
LM129B/LM329B
LM129C/LM329C
LM329D
1mA ≤ I
R
≤ 15mA
T
A
= 25°C, I
R
= 1mA
1mA ≤ I
R
≤ 15mA
T
A
= 25°C, 10Hz ≤ f ≤ 10kHz
T
A
= 45°C ±0.1°C, I
R
= 1mA ±0.3%
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
LM129A/
LM129B/LM129C
MIN
TYP
MAX
6.7
6.9
9
12
6
15
30
7.2
14
LM329A/LM329B/
LM329C/LM329D
MIN
TYP
MAX
6.6
6.9
9
12
6
15
30
50
1
1
20
0.8
1
7
20
2
100
7.25
20
UNITS
V
mV
mV
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
Ω
Ω
µV
ppm/kHr
10
20
50
10
20
50
100
Change in Temperature
Coefficient
r
Z
e
n
∆V
Z
∆Time
Dynamic Impedance
RMS Noise
Long-Term Stability
1
0.6
0.8
7
20
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
To determine the junction temperature as a function of the ambient
temperature, see
q
JA
for each package.
129329fd
For more information
www.linear.com/LM329
3
LM129/LM329
Typical perForMance characTerisTics
Reverse Characteristics
100
100
Dynamic Impedance
T
A
= 25°C
8
6
Response Time
OUTPUT
REVERSE CURRENT (mA)
10
DYNAMIC IMPEDANCE ( )
10
VOLTAGE (V)
4
2
0
14
V
IN
6.8k
V
OUT
1.0
T
J
= 25°C
T
J
= 55°C
T
J
= 125°C
1.0
0.1
INPUT
0
100
200
300
TIME (µs)
400
129329 G03
0.01
6.45
.
6.55
6.65 6.75 6.85 6.95
REVERSE VOLTAGE (V)
7.05
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
129329 G02
0
129329 G01
Forward Characteristics
1.2
1.0
FORWARD VOLTAGE (V)
T
A
= 25°C
150
Noise Voltage
Low Frequency Noise Voltage
0.01Hz TO 1Hz
0.6
0.4
0.2
0
0.001
100
0.01
0.1
1.0
FORWARD CURRENT (mA)
10
129329 G04
50
10
100
1k
FREQUENCY (Hz)
NOISE (10µV/DIV)
NOISE (nV/√Hz)
0.8
10k
100k
129329 G05
0
50
150
100
TIME (SECONDS)
200
250
129329 G06
4
129329fd
For more information
www.linear.com/LM329
LM129/LM329
scheMaTic DiagraM
1
50
Q2
D1
6.2V
Q3
2k
Q4
Q1
30k
2k
2.6k
2
129329 SD
+
1k
Q5
Q6
15pF
30pF
10k
Q7
–
129329fd
For more information
www.linear.com/LM329
5
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