LM185E-2.5/883

LM185-25 NSC | Alldatasheet

Document overview

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Technical content

Features

n ±20 mV ( ±0.8%) max. initial tolerance (A grade) n Operating current of 20 µA to 20 mA n 0.6Ω dynamic impedance (A grade) n Low temperature coefficient n Low voltage reference — 2.5V n 1.2V device and adjustable device also available — LM185-1.2 series and LM185 series, respectively Connection Diagrams TO-92 Plastic Package SO Package 00551908 Bottom View Order Number LM285Z-2.5, LM285BXZ-2.5, LM285BYZ-2.5 LM385Z-2.5, LM385AXZ-2.5 LM385AYZ-2.5, LM385BZ-2.5, LM385BXZ-2.5 or LM385BYZ-2.5 See NS Package Number Z03A 00551911 Order Number LM285M-2.5, LM285BXM-2.5, LM285BYM-2.5 LM385M-2.5, LM385BM-2.5 LM385BXM-2.5 or LM385BYM-2.5 See NS Package Number M08A SOT-23 00551929 * Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating. Order Number LM385M3-2.5 See NS Package Number MA03B February 2005 LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode © 2005 National Semiconductor Corporation DS005519 www.national.com

Connection Diagrams (Continued) LCC Leadless Chip Carrier TO-46 Metal Can Package 00551914 Order Number LM185E-2.5/883 See NS Package Number E20A 00551913 Bottom View Order Number LM185H-2.5, LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883, LM185BYH-2.5, LM185BYH2.5/883, LM285H-2.5, or LM285BYH-2.5 See NS Package Number H02A www.national.com 2

Absolute Maximum Ratings(Notes 1, If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current 30 mA Forward Current 10 mA Operating Temperature Range (Note 3) LM185-2.5 −55˚C to + 125˚C LM285-2.5 −40˚C to + 85˚C LM385-2.5 0˚C to 70˚C Storage Temperature −55˚C to + 150˚C Soldering Information SO and SOT Package 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) Parameter Conditions Typ LM385A-2.5 Units (Limits) LM385AX-2.5 LM385AY-2.5 Tested Design Limit Limit (Note 5) (Note 6) Reverse Breakdown I R = 100 µA 2.500 2.480 V(Min) Voltage 2.520 V(Max) 2.500 2.470 V(Min)

2.530 V(Max)

Minimum Operating 12 18 20 µA Current (Max) Reverse Breakdown I MIN ≤ IR ≤ 1mA 1 1.5 mV Voltage Change with (Max) Current 1 mA ≤ IR ≤ 20 mA 10 20 mV (Max) Reverse Dynamic I R = 100 µA, 0.2 0.6 Ω Impedance f = 20 Hz 1.5 Wideband Noise (rms) I R = 100 µA 120 µV

10 Hz ≤ f ≤ 10 kHz

Long Term Stability I R = 100 µA, T = 1000 Hr, 20 ppm T A = 25˚C ±0.1˚C Average Temperature I MIN ≤ IR ≤ 20 mA Coefficient (Note 7) X Suffix 30 ppm/˚C Y Suffix 50 (Max) All Others 150 www.national.com3

LM185-2.5 LM185BX-2.5 LM385B-2.5 LM185BY-2.5 LM385BX-2.5 LM385-2.5 Units LM285-2.5 LM385BY-2.5 (Limit) Parameter Conditions Typ LM285BX-2.5 LM285BY-2.5 Tested Design Tested Design Tested Design Limit Limit Limit Limit Limit Limit (Note 5) (Note (Note (Note (Note 6) (Note (Note Reverse Breakdown T A = 25˚C, 2.5 2.462 2.462 2.425 V(Min) Voltage 20 µA ≤ IR ≤ 20 mA 2.538 2.538 2.575 V(Max) Minimum Operating Current 13 20 30 20 30 20 30 µA (Max)LM385M3-2.5 15 20 Reverse Breakdown Voltage Change with Current 20 µA ≤ I R ≤ 1 mA (Max) 1m A ≤ IR ≤ 20 mA 10 20 20 25 20 25 mV (Max) Reverse Dynamic IR = 100 µA, 1 Ω Impedance f = 20 Hz Wideband Noise (rms) IR = 100 µA, 120 µV

10 Hz ≤ f ≤ 10

IR = 100 µA, T = 1000 Hr, 20 ppm TA = 25˚C ±0.1˚C Average Temperature IR = 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 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-2.5 for military specifications. Note 3: For elevated temperature operation, T J MAX is: LM185 150˚C LM285 125˚C LM385 100˚C Thermal Resistance TO-92 TO-46 SO-8 SOT-23 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 www.national.com 4

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–TMIN. 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 available on request. Typical Performance Characteristics Reverse Characteristics Reverse Characteristics 00551915 00551916 Forward Characteristics Temperature Drift 00551917 00551918 Reverse Dynamic Impedance Reverse Dynamic Impedance 00551919 00551920 www.national.com5

Typical Performance Characteristics (Continued) Noise Voltage Filtered Output Noise 00551921 00551922 Response Time 00551923

Applications

Wide Input Range Reference 00551912 Micropower Reference from 9V Battery 00551902 LM385-2.5 Applications Micropower 5V Reference(Note 9) 00551909 Note 9: IQ . 40 µA www.national.com 6

LM385-2.5 Applications (Continued) Micropower 10V Reference(Note 10) 00551910 Note 10: IQ . 30 µA standby current Precision 1 µA to 1 mA Current Sources 00551924 00551925 www.national.com7

LM385-2.5 Applications (Continued) METER THERMOMETERS 0˚C–100˚C Thermomemter 00551926 Calibration 1. Short LM385-2.5, adjust R3 for I OUT=temp at 1µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade 0˚F–50˚F Thermomemter 00551927 Calibration 1. Short LM385-2.5, 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 00551906 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. Seebeck Voltage Voltage Thermocouple Co- R1 R2 Across R1 Across R2 Type efficient ( Ω)( Ω) @25˚C (mV) (µV/˚C) (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 8

LM385-2.5 Applications (Continued) Improving Regulation of Adjstable Regulators 00551907 Schematic Diagram 00551901 www.national.com9

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM185E-2.5/883 TO-46 Metal Can Package (H) Order Number LM185H-2.5, LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883, LM185BYH-2.5, LM185BYH-2.5/883, LM285H-2.5, or LM285BYH-2.5 www.national.com 10

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM385M3-2.5 www.national.com11

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Small Outline (SO-8) Package (M) Order Number LM285M-2.5, LM285BXM-2.5, LM285BYM-2.5, LM385M-2.5, LM385BM-2.5, LM385BXM-2.5 or LM385BYM-2.5 www.national.com 12

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO-92 Plastic Package (Z) Order Number LM285Z-2.5, LM285BXZ-2.5, LM285BYZ-2.5, LM385Z-2.5, LM385AXZ-2.5, LM385AYZ-2.5, LM385BZ-2.5, LM385BXZ-2.5 or LM385BYZ-2.5 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 manufactures products and uses packing materials that 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 LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode