LM329 Precision ReferenceJanuary 17, 2008
LM329
Precision Reference
General Description
The LM329 is a precision multi-current temperature-compen-sated 6.9V zener reference with dynamic impedance a factorof 10 to 100 less than discrete diodes. Constructed in a singlesilicon chip, the LM329 uses active circuitry to buffer the in-ternal zener allowing the device to operate over a 0.5 mA to15 mA range with virtually no change in performance. TheLM329 is available with a temperature coefficients of 0.01%/°C. This reference also has excellent long term stability andlow noise.
A new subsurface breakdown zener used in the LM329 giveslower noise and better long-term stability than conventionalIC zeners. Further the zener and temperature compensatingtransistor are made by a planar process so they are immuneto problems that plague ordinary zeners. For example, thereis virtually no voltage shift in zener voltage due to temperaturecycling and the device is insensitive to stress on the leads.The LM329 can be used in place of conventional zeners withimproved performance. The low dynamic impedance simpli-fies biasing and the wide operating current allows the re-placement of many zener types.
The LM329 for operation over 0°C to 70°C is available in aTO-92 epoxy package.
Features
■■■■■■■■
0.6 mA to 15 mA operating current
0.8Ω dynamic impedance at any current
Available with temperature coefficient of 0.01%/°C7μV wideband noise5% initial tolerance
0.002% long term stabilityLow cost
Subsurface zener
Connection Diagram
Plastic Package (TO-92)
Typical Applications
Simple Reference
Bottom View
Order Number LM329DZSee NS Package Z03A
571404
571401
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LM329Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Reverse Breakdown CurrentForward Current
30 mA2 mA
(Note 2)
Operating Temperature Range LM329
Storage Temperature RangeSoldering Information
TO-92 package: 10 sec.
0°C to +70°C−55°C to +150°C
260°C
Electrical Characteristics
Parameter
Reverse Breakdown Voltage
Reverse Breakdown Change with Current (Note 3)Reverse Dynamic Impedance(Note 3)RMS Noise
Long Term Stability(1000 hours)
Temperature CoefficientChange In Reverse Breakdown Temperature CoefficientReverse Breakdown Change with Current
Reverse Dynamic Impedance
Conditions
TA = 25°C,
0.6 mA ≤ IR ≤ 15 mATA = 25°C,
0.6 mA ≤ IR ≤ 15 mATA = 25°C, IR = 1 mA
TA = 25°C,
10 Hz ≤ F ≤ 10 kHzTA = 45°C ± 0.1°C,IR = 1 mA ± 0.3%IR = 1 mA
1 mA ≤ IR ≤ 15 mA
1 mA ≤ IR ≤ 15 mA
1 mA ≤ IR ≤ 15 mA
Min6.6
Typ 6.9
90.8
7 20501 12
1
Max 7.25 202 100 100
UnitsVmVΩ
μVppmppm/°Cppm/°CmVΩ
Note 1:“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the deviceis functional, but do not guarantee specific performance limits.
Note 2:These specifications apply for 0°C ≤ TA ≤ +70°C for the LM329 unless otherwise specified. The maximum junction temperature for a LM329 is 100°C.For operating at elevated temperature. The TO-92 package, the derating is based on 180°C/W junction to ambient with 0.4″ leads from a PC board and 160°C/W junction to ambient with 0.125″ lead length to a PC board.
Note 3:These changes are tested on a pulsed basis with a low duty-cycle. For changes versus temperature, compute in terms of tempco.Note 4:
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LM329Typical Applications
Low Cost 0–25V Regulator
571407
Adjustable Bipolar Output Reference
571408
0V to 20V Power Reference
571409
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LM329External Reference for Temperature Transducer
571402
Positive Current Source
571411
Buffered Reference with Single Supply
571403
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LM329Schematic Diagram
571410
Typical Performance Characteristics
Reverse Characteristics
Reverse Voltage Change
571413
571417
Forward CharacteristicsResponse Time
571415571414
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LM329Dynamic Impedance
Zener Noise Voltage
571416571418
Low Frequency Noise Voltage
571405
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LM329Physical Dimensions inches (millimeters) unless otherwise noted
Plastic Package
Order Number LM329DZ,
NS Package Z03A
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LM329 Precision ReferenceNotes
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