LM129/LM329
6.9V Precision
Voltage Reference
FEATURES
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DESCRIPTION
The LM129 temperature compensated 6.9V Zener refer-
ences 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 pack-
age 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%
174Ω
0.1%
8
T
A
= 25°C
7
6
5
4
3
2
1
0
0
2
8
6
REVERSE CURRENT (mA)
4
10
129329 TA01b
Reverse Voltage Change
LM329
6.95V
2
–
+
7
LT1001
6
3
20k
0.1%
4
10k
OUT
20mA
129329 TA01
4.3k
129329fc
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,
θ
JA
= 440°C/W,
θ
JC
= 80°C/W
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 150°C,
θ
JA
= 160°C/W
OBSOLETE PACKAGE
Consider the Z Package for Alternate Source
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
LM329AZ
LM329BZ
LM329CZ
LM329DZ
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
Contact LTC Marketing for availability of LM329AZ, LM329CZ and LM329DZ.
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/
129329fc
2
LM129/LM329
ELECTRICAL CHARACTERISTICS
SYMBOL
V
Z
ΔV
Z
ΔI
R
ΔV
Z
ΔTemp
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
ΔV
Z
ΔTime
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
θ
JA
for each package.
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics
100
100
T
A
= 25°C
6
10
DYNAMIC IMPEDANCE (Ω)
REVERSE CURRENT (mA)
10
VOLTAGE (V)
4
2
0
14
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
129329 G02
Dynamic Impedance
8
Response Time
OUTPUT
V
IN
6.8k
V
OUT
1.0
T
J
= 25°C
T
J
= 55°C
0.1
T
J
= 125°C
0.01
6.45
.
1.0
INPUT
0
100
200
300
TIME (μs)
400
129329 G03
6.55
6.65 6.75 6.85 6.95
REVERSE VOLTAGE (V)
7.05
0
129329 G01
129329fc
3
LM129/LM329
TYPICAL PERFORMANCE CHARACTERISTICS
Forward Characteristics
1.2
1.0
FORWARD VOLTAGE (V)
NOISE (nV/√Hz)
0.8
0.6
0.4
0.2
0
0.001
50
0.01
0.1
1.0
FORWARD CURRENT (mA)
10
129329 G04
Noise Voltage
150
Low Frequency Noise Voltage
0.01Hz TO 1Hz
T
A
= 25°C
100
10
100
1k
FREQUENCY (Hz)
NOISE (10μV/DIV)
10k
100k
129329 G05
0
50
150
100
TIME (SECONDS)
200
250
129329 G06
SCHEMATIC DIAGRAM
1
50Ω
Q2
D1
6.2V
Q3
2k
Q4
10k
Q1
30k
2k
2.6k
2
129329 SD
+
1k
Q5
Q6
15pF
30pF
Q7
–
129329fc
4
LM129/LM329
PACKAGE DESCRIPTION
H Package
2-Lead and 3-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1340)
0.209 – 0.219
(5.309 – 5.537)
0.178 – 0.195
(4.521 – 4.953)
0.500
(12.700)
MIN
*
0.085 – 0.105
(2.159 – 2.667)
REFERENCE
PLANE
0.025
(0.635)
MAX
0.016 – 0.021**
(0.406 – 0.533)
DIA
0.050
(1.270)
TYP
0.100
(2.540)
TYP
PIN 1
FOR 3-LEAD PACKAGE ONLY
45°
0.036 – 0.046
(0.914 – 1.168)
0.028 – 0.048
(0.711 – 1.219)
H02/03(TO-46) 1098
0.050
(1.270)
TYP
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
OBSOLETE PACKAGE
Z Package
3-Lead TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410)
0.060 0.005
(1.524 0.127)
DIA
0.180
(4.572
0.005
0.127)
0.180
(4.572
0.005
0.127)
0.90
(2.286)
NOM
0.500
(12.70)
MIN
0.050 UNCONTROLLED
(1.270) LEAD DIMENSION
MAX
5
NOM
0.050
(1.27)
BSC
0.016
(0.406
0.003
0.076)
0.015
(0.381
0.002
0.051)
Z3 (TO-92) 0401
0.060
(1.524
0.010
0.254)
0.098 +016/–0.04
(2.5 +0.4/–0.1)
2 PLCS
0.140
(3.556
0.010
0.127)
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
10 NOM
129329fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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