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 0.6Ω 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 © 2000 National Semiconductor Corporation DS005714 Bottom View Order Number LM329BZ, LM329CZ or LM329DZ See NS Package Z03A www.national.com LM129/LM329 Precision Reference March 2000 LM129/LM329 Typical Applications Simple Reference DS005714-1 www.national.com 2 Operating Temperature Range LM129 LM329 Storage Temperature Range Soldering Information TO-92 package: 10 sec. TO-46 package: 10 sec. 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 −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 with Current (Note 4) Reverse Dynamic Impedance Units Min Typ Max Min Typ Max 6.7 6.9 7.2 6.6 6.9 7.25 V 0.6 mA ≤ IR ≤ 15 mA 9 14 9 20 mV TA = 25˚C, IR = 1 mA 0.6 1 0.8 2 Ω 7 20 7 100 µV TA = 25˚C, 0.6 mA ≤ IR ≤ 15 mA Reverse Breakdown Change LM329A, B, C, D Conditions TA = 25˚C, (Note 4) RMS Noise TA = 25˚C, 10 Hz ≤ F ≤ 10 kHz Long Term Stability TA = 45˚C ± 0.1˚C, (1000 hours) IR = 1 mA ± 0.3% Temperature Coefficient IR = 1 mA 20 20 ppm LM129A, LM329A 6 10 6 10 ppm/˚C LM129B, LM329B 15 20 15 20 ppm/˚C LM129C, LM329C 30 50 LM329D Change In Reverse Breakdown 30 50 ppm/˚C 50 100 ppm/˚C 1 mA ≤ IR ≤ 15 mA 1 1 ppm/˚C 1 mA ≤ IR ≤ 15 mA 12 12 mV 1 mA ≤ IR ≤ 15 mA 0.8 1 Ω Temperature Coefficient Reverse Breakdown Change with Current Reverse Dynamic Impedance 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. 3 www.national.com LM129/LM329 Absolute Maximum Ratings (Note 1) LM129/LM329 Typical Applications Low Cost 0–25V Regulator DS005714-7 Adjustable Bipolar Output Reference DS005714-8 www.national.com 4 LM129/LM329 Typical Applications (Continued) 0V to 20V Power Reference DS005714-9 External Reference for Temperature Transducer DS005714-2 5 www.national.com LM129/LM329 Typical Applications (Continued) Positive Current Source DS005714-11 Buffered Reference with Single Supply DS005714-3 www.national.com 6 LM129/LM329 Schematic Diagram DS005714-10 Typical Performance Characteristics Reverse Characteristics Response Time Forward Characteristics DS005714-13 Dynamic Impedance DS005714-14 Reverse Voltage Change Zener Noise Voltage DS005714-17 DS005714-16 7 DS005714-15 DS005714-18 www.national.com LM129/LM329 Typical Performance Characteristics (Continued) Low Frequency Noise Voltage DS005714-5 www.national.com 8 LM129/LM329 Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package Order Number LM129AH, LM129AH/883, LM129BH, LM129BH/883, LM129CH, LM329AH, LM329BH, LM329CH, or LM329DH NS Package H02A 9 www.national.com LM129/LM329 Precision Reference Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Plastic Package Order Number LM329BZ, LM329CZ, or LM329DZ NS Package Z03A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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