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Part: 5962-8992101XA
Category:
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Description: LM129 - Precision Reference Life-time Buy , Package: TO-46, Pin Nb=2
Company: National Semiconductor Corporation
Datasheet: Download 5962-8992101XA datasheet File size : 224 kB
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LM129/LM329 Precision Reference
March 2000
LM129/LM329 Precision Reference
General Description
The LM129 and LM329 family are precision multi-current temperature-compensated 6.9V zener references with dynamic impedances a factor of 10 to 100 less than discrete diodes. Constructed in a single silicon chip, the LM129 uses active circuitry to buffer the internal zener allowing the device to operate over a 0.5 mA to 15 mA range with virtually no change in performance. The LM129 and LM329 are available with selected temperature coefficients of 0.001, 0.002, 0.005 and 0.01%/°C. These references also have excellent long term stability and low noise. A new subsurface breakdown zener used in the LM129 gives lower noise and better long-term stability than conventional IC zeners. Further the zener and temperature compensating transistor are made by a planar process so they are immune to problems that plague ordinary zeners. For example, there is virtually no voltage shift in zener voltage due to temperature cycling and the device is insensitive to stress on the leads. The LM129 can be used in place of conventional zeners with improved performance. The low dynamic impedance simplifies biasing and the wide operating current allows the replacement of many zener types. The LM129 is packaged in a 2-lead TO-46 package and is rated for operation over a -55°C to +125°C temperature range. The LM329 for operation over 0°C to 70°C is available in both a hermetic TO-46 package and a TO-92 epoxy package.
Features
n n n n n n n n 0.6 mA to 15 mA operating current 0.6 dynamic impedance at any current Available with temperature coefficients of 0.001%/°C 7µV wideband noise 5% initial tolerance 0.002% long term stability Low cost Subsurface zener
Connection Diagrams
Metal Can Package (T0 46) Plastic Package (TO-92)
DS005714-4 DS005714-6
Pin 2 is electrically connected to case
Bottom View Order Number LM129AH, LM129AH/883, LM129BH, LM129BH/883, LM129CH, LM329AH, LM329BH, LM329CH or LM329DH See NS Package H02A
Bottom View Order Number LM329BZ, LM329CZ or LM329DZ See NS Package Z03A
© 2000 National Semiconductor Corporation
DS005714
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LM129/LM329
Typical Applications
Simple Reference
DS005714-1
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2
LM129/LM329
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 3) Reverse Breakdown Current Forward Current 30 mA 2 mA
Operating Temperature Range LM129 LM329 Storage Temperature Range Soldering Information TO-92 package: 10 sec. TO-46 package: 10 sec.
-55°C to +125°C 0°C to +70°C -55°C to +150°C 260°C 300°C
Electrical Characteristics (Note 2)
LM129A, B, C Parameter Reverse Breakdown Voltage Reverse Breakdown Change with Current (Note 4) Reverse Dynamic Impedance (Note 4) RMS Noise Long Term Stability (1000 hours) Temperature Coefficient LM129A, LM329A LM129B, LM329B LM129C, LM329C LM329D Change In Reverse Breakdown Temperature Coefficient Reverse Breakdown Change with Current Reverse Dynamic Impedance 1 mA IR 15 mA 0.8 1
Note 1: "Absolute Maximum Ratings" indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2: These specifications apply for -55°C TA +125°C for the LM129 and 0°C TA +70°C for the LM329 unless otherwise specified. The maximum junction temperature for an LM129 is 150°C and LM329 is 100°C. For operating at elevated temperature, devices in TO-46 package must be derated based on a thermal resistance of 440°C/W junction to ambient or 80°C/W junction to case. For 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: Refer to RETS129H for LM129 family military specifications. Note 4: These changes are tested on a pulsed basis with a low duty-cycle. For changes versus temperature, compute in terms of tempco.
LM329A, B, C, D Units Min 6.6 Typ 6.9 9 0.8 Max 7.25 20 2 V mV
Conditions Min TA = 25°C, 0.6 mA IR 15 mA TA = 25°C, 0.6 mA IR 15 mA TA = 25°C, IR = 1 mA TA = 25°C, 10 Hz F 10 kHz TA = 45°C ± 0.1°C, IR = 1 mA ± 0.3% IR = 1 mA 6 15 30 1 mA IR 15 mA 1 mA IR 15 mA 1 12 10 20 50 6 15 30 50 1 12 10 20 50 100 20 20 7 20 7 100 9 0.6 14 1 6.7 6.9 7.2 Typ Max
µV ppm ppm/°C ppm/°C ppm/°C ppm/°C ppm/°C mV
3
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LM129/LM329
Typical Applications
Low Cost 0 25V Regulator
DS005714-7
Adjustable Bipolar Output Reference
DS005714-8
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LM129/LM329
Typical Applications
(Continued) 0V to 20V Power Reference
DS005714-9
External Reference for Temperature Transducer
DS005714-2
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