LM185-12 NSC | Alldatasheet

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n ±4m V( ±0.3% ) max. initial tolerance (A grade) n Operating current of 10 µA to 20 mA n 0.6Ω max dynamic impedance (A grade) n Low temperature coefficient n Low voltage reference — 1.235V n 2.5V device and adjustable device also available n LM185-2.5 series and LM185 series, respectively Connection Diagrams T0-92 Plastic Package (Z) DS005518-10 Bottom View Order Number LM285Z-1.2, LM285BXZ-1.2, LM285BYZ-1.2 LM385Z-1.2, LM385BZ-1.2 LM385BXZ-1.2 or LM385BYZ-1.2 See NS Package Number Z03A SOT23 DS005518-33 * Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating. Order Number LM385M3-1.2 See NS Package Number MA03B January 2000 LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode © 2000 National Semiconductor Corporation DS005518 www.national.com

Connection Diagrams (Continued) DS005518-9 Order Number LM285M-1.2, LM285BXM-1.2, LM285BYM-1.2 LM385M-1.2, LM385BM-1.2 LM385BXM-1.2 or LM385BYM-1.2 See NS Package Number M08A TO-46 Metal Can Package (H) DS005518-6 Bottom View Order Number LM185H-1.2, LM185H-1.2/883, LM185BXH-1.2, LM185BYH-1.2 LM285H-1.2 or LM285BXH-1.2 See NS Package Number H02A www.national.com 2

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 2) Reverse Current 30 mA Forward Current 10 mA Operating Temperature Range (Note 3) LM185-1.2 −55˚C to +125˚C LM285-1.2 −40˚C to +85˚C LM385-1.2 0˚C to 70˚C Storage Temperature −55˚C to +150˚C Soldering Information TO-92 package: 10 sec. 260˚C TO-46 package:10 sec. 300˚C SO and SOT Pkg. Vapor phase (60 sec.) 215˚C Infrared (15 sec.) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. Electrical Characteristics(Note 4) LM185-1.2 LM185BX-1.2 LM385B-1.2 LM185BY-1.2 LM385BX-1.2 LM385-1.2 LM285-1.2 LM385BY-1.2 Units Parameter Conditions Typ LM285BX-1.2 (Limit) LM285BY-1.2 Tested Design Tested Design Tested Design Limit Limit Limit Limit Limit Limit (Notes 5, 8) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6) Reverse Breakdown T A = 25˚C, 1.235 1.223 1.223 1.205 V(Min) Voltage 10 µA ≤ IR ≤ 20 mA 1.247 1.247 1.260 V(Max) Minimum Operating 8 10 20 15 20 15 20 µA Current LM385M3-1.2 10 15 (Max) Reverse Breakdown 10 µA ≤ IR ≤ 1m A 1 1.5 1 1.5 1 1.5 mV Voltage Change (Max) with Current 1 mA ≤ IR ≤ 20 mA 10 20 20 25 20 25 mV (Max) Reverse Dynamic I R = 100 µA, f= 20 Hz 1 Ω Impedance Wideband Noise I R = 100 µA, 60 µV (rms) 10 Hz ≤ f≤ 10 kHz Long Term Stability I R = 100 µA, T= 1000 Hr, 20 ppm TA = 25˚C ±0.1˚C Average Temperature I R = 100 µA Coefficient (Note 7) X Suffix 30 30 ppm/˚C Y Suffix 50 50 ppm/˚C All Others 150 150 150 ppm/˚C (Max) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in- tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2:Refer to RETS185H-1.2 for military specifications. Note 3:For elevated temperature operation, Tjmax is: LM185 150˚C LM285 125˚C LM385 100˚C Thermal Resistance TO-92 TO-46 SO-8 SOT23 θJA (junction to ambient) 180˚C/W (0.4" leads) 440˚C/W 165˚C/W 283˚C/W 170˚C/W (0.125" leads) θJC (junction to case) N/A 80˚C/W N/A N/A Note 4:Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25˚C. www.national.com3

Electrical Characteristics(Note 4) (Continued) Note 5:Guaranteed and 100% production tested. Note 6:Guaranteed, but not 100% production tested. These limits are not used to calculate average outgoing quality levels. Note 7:The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating TMAX and TMIN , divided by TMAX −T MIN . The measured temperatures are −55˚C, −40˚C, 0˚C, 25˚C, 70˚C, 85˚C, 125˚C. Note 8:A military RETS electrical specification is available on request. Typical Performance Characteristics Reverse Characteristics DS005518-13 Reverse Characteristics DS005518-14 Forward Characteristics DS005518-15 Temperature Drift of 3 Representative Units DS005518-16 Reverse Dynamic Impedance DS005518-17 Reverse Dynamic Impedance DS005518-18 Noise Voltage DS005518-19 Filtered Output Noise DS005518-20 Response Time DS005518-21 www.national.com 4

1.5V Battery DS005518-23 Micropower* 5V Regulator DS005518-24 *IQ ≅ 30 µA Micropower* 10V Reference DS005518-25 *IQ ≅20 µA standby current Precision 1 µA to 1 mA Current Sources DS005518-26 DS005518-27 www.national.com5

Typical Applications(Continued) METER THERMOMETERS 0˚C−100˚C Thermometer DS005518-28 Calibration 1. Short LM385-1.2, adjust R3 for IOUT = temp at 1 µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade †IQ at 1.3V≅500 µA IQ at 1.6V≅2.4 mA Lower Power Thermometer DS005518-29 *2N3638 or 2N2907 select for inverse HFE ≅ 5 †Select for operation at 1.3V ‡IQ ≅ 600 µA to 900 µA 0˚F−50˚F Thermometer DS005518-30 Calibration 1. Short LM385-1.2, adjust R3 for I OUT = temp at 1.8 µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Micropower Thermocouple Cold Junction Compensator DS005518-31 Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. Thermocouple Seebeck R1 R2 Voltage Voltage Type Coefficient ( Ω )( Ω ) Across R1 Across R2 (µV/˚C) @ 25˚C (mV) (mV) J 52.3 523 1.24k 15.60 14.32 T 42.8 432 1k 12.77 11.78 K 40.8 412 953 Ω 12.17 11.17 S 6.4 63.4 150 Ω 1.908 1.766 Typical supply current 50 µA www.national.com 6

Typical Applications(Continued) Schematic Diagram Centigrade Thermometer DS005518-1 Calibration 1. Adjust R1 so that V1= temp at 1 mV/˚K 2. Adjust V2 to 273.2 mV †IQ for 1.3V to 1.6V battery volt- age = 50 µA to 150 µA DS005518-7 www.national.com7

Physical Dimensionsinches (millimeters) unless otherwise noted TO-46 Metal Can Package (H) Order Number LM385M3-1.2 www.national.com 8

Physical Dimensionsinches (millimeters) unless otherwise noted (Continued) Small Outline (SO-8) Package Order Number LM285M-1.2, LM285BXM-1.2, LM285BYM-1.2 LM385M-1.2, LM385BM-1.2, LM385BXM-1.2, LM385BYM-1.2 TO-92 Plastic Package (Z) Order Number LM285Z-1.2, LM285BXZ-1.2 LM285BYZ-1.2, LM385Z-1.2, LM385BZ-1.2 LM385BXZ-1.2 or LM385BYZ-1.2 www.national.com9

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. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.