LM136-2.5

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LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode Literature Number: SNVS749D

The LM136-2.5/LM236-2.5 and LM336-2.5 integrated cir- cuits are precision 2.5V shunt regulator diodes. These monolithic IC voltage references operate as a low- temperature-coefficient 2.5V zener with 0.2 Ω dynamic im- pedance. A third terminal on the LM136-2.5 allows the refer- ence voltage and temperature coefficient to be trimmed easily. The LM136-2.5 series is useful as a precision 2.5V low voltage reference for digital voltmeters, power supplies or op amp circuitry. The 2.5V make it convenient to obtain a stable reference from 5V logic supplies. Further, since the LM136- 2.5 operates as a shunt regulator, it can be used as either a positive or negative voltage reference. The LM136-2.5 is rated for operation over −55˚C to +125˚C while the LM236-2.5 is rated over a −25˚C to +85˚C tem- perature range. The LM336-2.5 is rated for operation over a 0˚C to +70˚C temperature range. See the connection diagrams for avail- able packages.

Features

n Low temperature coefficient n Wide operating current of 400 µA to 10 mA n 0.2Ω dynamic impedance n ±1% initial tolerance available n Guaranteed temperature stability n Easily trimmed for minimum temperature drift n Fast turn-on Connection Diagrams TO-92 Plastic Package 00571508 Bottom View Order Number LM336Z-2.5 or LM336BZ-2.5 See NS Package Number Z03A TO-46 Metal Can Package 00571520 Bottom View Order Number LM136H-2.5, or LM236AH-2.5 See NS Package Number H03H 00571512 Top View Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5 See NS Package Number M08A June 2005 LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode © 2005 National Semiconductor Corporation DS005715 www.national.com

2.5V Reference 00571509 2.5V Reference with Minimum Temperature Coefficient 00571510 †Adjust to 2.490V *Any silicon signal diode Wide Input Range Reference 00571511 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. Reverse Current 15 mA Forward Current 10 mA Storage Temperature −60˚C to +150˚C Operating Temperature Range (Note 2) LM136 −55˚C to +150˚C LM236 −25˚C to +85˚C LM336 0˚C to +70˚C Soldering Information Vapor Phase (60 sec.) 215˚C Infrared (15 sec.) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” (Appendix D) for other methods of soldering surface mount devices. Electrical Characteristics (Note 3) LM136A-2.5/LM236A-2.5 LM336B-2.5 Parameter Conditions LM136-2.5/LM236-2.5 LM336-2.5 Units Min Typ Max Min Typ Max Reverse Breakdown Voltage TA=25˚C, IR=1 mA Reverse Breakdown Change TA=25˚C, 2.6 6 2.6 10 mV With Current 400 µA ≤IR≤10 mA Reverse Dynamic Impedance TA=25˚C, IR=1 mA, f = 100 Hz 0.2 0.6 0.2 1 Ω Temperature Stability V R Adjusted to 2.490V (Note 4) I R=1 mA, Figure 2 0˚C≤TA≤70˚C (LM336) 1.8 6 mV (LM236H, LM236Z) −25˚C ≤ TA ≤ +85˚C (LM236M) 7.5 18 mV −55˚C≤TA≤+125˚C (LM136) 12 18 mV Reverse Breakdown Change 400 µA≤IR≤10 mA 3 10 3 12 mV With Current Reverse Dynamic Impedance IR=1 mA 0.4 1 0.4 1.4 Ω Long Term Stability T A=25˚C ±0.1˚C, IR=1 mA, 20 20 ppm t = 1000 hrs Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified operating conditions. Note 2: For elevated temperature operation, T j max is: LM136 150˚C LM236 125˚C LM336 100˚C Thermal Resistance TO-92 TO-46 SO-8 θja (Junction to Ambient) 180˚C/W (0.4" leads) 440˚C/W 165˚C/W 170˚C/W (0.125" lead) θja (Junction to Case) n/a 80˚C/W n/a www.national.com3

Electrical Characteristics (Note 3) (Continued) Note 3: Unless otherwise specified, the LM136-2.5 is specified from −55˚C ≤ TA ≤ +125˚C, the LM236-2.5 from −25˚C ≤ TA ≤ +85˚C and the LM336-2.5 from 0˚C ≤ TA ≤ +70˚C. Note 4: Temperature stability for the LM336 and LM236 family is guaranteed by design. Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Stability is defined as the maximum change in Vref from 25˚C to TA (min) or TA (max). www.national.com 4

Typical Performance Characteristics Reverse Voltage Change Zener Noise Voltage 00571521 00571522 Dynamic Impedance Response Time 00571523 00571524 Reverse Characteristics Forward Characteristics 00571525 00571526 www.national.com5

Application Hints (Continued) Low Cost 2 Amp Switching Regulator† 00571505 *L1 60 turns #16 wire on Arnold Core A-254168-2 †Efficiency ≈ 80% Precision Power Regulator with Low Temperature Coefficient 00571513 5V Crowbar 00571514 Trimmed 2.5V Reference with Temperature Coefficient Independent of Breakdown Voltage 00571515 *Does not affect temperature coefficient www.national.com7

Application Hints (Continued) Adjustable Shunt Regulator 00571506 Linear Ohmmeter 00571516 www.national.com 8

Application Hints (Continued) Op Amp with Output Clamped 00571517 Bipolar Output Reference 00571518 2.5V Square Wave Calibrator 00571519 5V Buffered Reference 00571530 Low Noise Buffered Reference 00571531 www.national.com9

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Physical Dimensions inches (millimeters) unless otherwise noted Small Outline (SO) Package (M) Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5 www.national.com11

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO-92 Plastic Package (Z) Order Number LM336Z-2.5 or LM336BZ-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. Leadfree products are RoHS compliant. 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 LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode

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