LM185-1.2

LM185-1.2 NSC | Alldatasheet

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n ±1% and 2% initial tolerance n Operating current of 10µA to 20mA n 1Ω dynamic impedance 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) SOT23 00551810 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 00551833 * 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 MF03A May 2003 LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode © 2004 National Semiconductor Corporation DS005518 www.national.com

Connection Diagrams (Continued) TO-46 Metal Can Package (H) 00551809 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 00551806 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 30mA Forward Current 10mA 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 10µA ≤ IR ≤ 20mA 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 10µA ≤ IR ≤ 1mA 1 1.5 1 1.5 1 1.5 mV Voltage Change (Max) with Current 1mA ≤ IR ≤ 20mA 10 20 20 25 20 25 mV (Max) Reverse Dynamic I R = 100µA, f = 20Hz 1 Ω Impedance Wideband Noise I R = 100µA, 60 µV (rms) 10Hz ≤ f ≤ 10kHz Long Term Stability I R = 100µA, T = 1000 Hr, 20 ppm TA = 25˚C ±0.1˚C Average Temperature IR = 100µA 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 intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the ElectricalCharacteristics. 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, T j max is: LM185 150˚C LM285 125˚C LM385 100˚C www.national.com3

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 T A =T J = 25˚C. 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 T MAX and TMIN, divided by T MAX −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 Reverse Characteristics 00551813 00551814 Forward Characteristics Temperature Drift of 3 Representative Units 00551815 00551816 Reverse Dynamic Impedance Reverse Dynamic Impedance 00551817 00551818 www.national.com 4

Typical Performance Characteristics (Continued) Noise Voltage Filtered Output Noise 00551819 00551820 Response Time 00551821 Typical Applications Wide Input Range Reference 00551808 Micropower Reference from 9V Battery 00551822 Reference from 1.5V Battery 00551823 www.national.com5

Typical Applications (Continued) Micropower* 5V Regulator 00551824 *IQ . 30µA Micropower* 10V Reference 00551825 *IQ .20µA standby current Precision 1µA to 1mA Current Sources 00551826 00551827 www.national.com 6

Typical Applications (Continued) METER THERMOMETERS 0˚C−100˚C Thermometer 00551828 Calibration 1. Short LM385-1.2, adjust R3 for I OUT= temp at 1µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade †IQ at 1.3V.500µA IQ at 1.6V.2.4mA Lower Power Thermometer 00551829 *2N3638 or 2N2907 select for inverse H FE . 5 †Select for operation at 1.3V ‡IQ . 600µA to 900µA 0˚F−50˚F Thermometer 00551830 Calibration 1. Short LM385-1.2, adjust R3 for I OUT= temp at 1.8µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Micropower Thermocouple Cold Junction Compensator 00551831 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 Across (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 953Ω 12.17 11.17 S 6.4 63.4 150Ω 1.908 1.766 Typical supply current 50µA www.national.com7

Typical Applications (Continued) Centigrade Thermometer 00551801 Calibration 1. Adjust R1 so that V1 = temp at 1mV/˚K 2. Adjust V2 to 273.2mV †IQ for 1.3V to 1.6V battery volt- age = 50µA to 150µA Schematic Diagram 00551807 www.national.com 8

Physical Dimensions inches (millimeters) unless otherwise noted TO-46 Metal Can Package (H) Order Number LM385M3-1.2 www.national.com9

Physical Dimensions inches (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.com 10

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. For the most current product information visit us at www.national.com. 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. 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode