LM136
LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode
General Description
The LM136-2.5/LM236-2.5and LM336-2.5integrated 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?dynamic im-pedance.A third terminal on the LM136-2.5allows the refer-ence voltage and temperature coefficient to be trimmed easily.
The LM136-2.5series 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 LM136-2.5operates as a shunt regulator,it can be used as either a positive or negative voltage reference.
The LM136-2.5is rated for operation over ?55?C to +125?C while the LM236-2.5is rated over a ?25?C to +85?C tem-perature range.
The LM336-2.5is 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 400μA to 10mA n 0.2?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-2.5or LM336BZ-2.5
See NS Package Number Z03A
TO-46
Metal Can Package
00571520
Bottom View
Order Number LM136H-2.5,LM136H-2.5/883,LM236H-2.5,
or LM236AH-2.5
See NS Package Number H03H
SO Package
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
?2005National Semiconductor Corporation https://www.wendangku.net/doc/6f9872251.html,
Typical Applications
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
L M 136-2.5/L M 236-2.5/L M 336-2.5V
https://www.wendangku.net/doc/6f9872251.html, 2
Absolute Maximum Ratings(Note1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current15mA Forward Current10mA Storage Temperature?60?C to+150?C Operating Temperature Range(Note2)
LM136?55?C to+150?C LM236?25?C to+85?C
LM3360?C to+70?C Soldering Information
TO-92Package(10sec.)260?C TO-46Package(10sec.)300?C SO Package
Vapor Phase(60sec.)215?C Infrared(15sec.)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(Note3)
LM136A-2.5/LM236A-2.5LM336B-2.5 Parameter Conditions LM136-2.5/LM236-2.5LM336-2.5Units
Min Typ Max Min Typ Max
Reverse Breakdown
Voltage
T A=25?C,I R=1mA
LM136,LM236,LM336 2.440 2.490 2.540 2.390 2.4902.590V
LM136A,LM236A,LM336B 2.465 2.490 2.515 2.440 2.4902.540V Reverse Breakdown
Change
T A=25?C, 2.66 2.610mV
With Current400μA≤I R≤10mA
Reverse Dynamic
Impedance
T A=25?C,I R=1mA,f=100Hz0.20.60.21?Temperature Stability V R Adjusted to2.490V
(Note4)I R=1mA,Figure2
0?C≤T A≤70?C(LM336) 1.86mV
?25?C≤T A≤+85?C 3.59mV
(LM236H,LM236Z)
?25?C≤T A≤+85?C(LM236M)7.518mV
?55?C≤T A≤+125?C(LM136)1218mV Reverse Breakdown
Change
400μA≤I R≤10mA310312mV
With Current
Reverse Dynamic
Impedance
I R=1mA0.410.4 1.4?
Long Term Stability T A=25?C±0.1?C,I R=1mA,2020ppm
t=1000hrs
Note1: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.
Note2:For elevated temperature operation,T j max is:
LM136150?C
LM236125?C
LM336100?C
Thermal Resistance TO-92TO-46SO-8
θja(Junction to Ambient)180?C/W(0.4"leads)440?C/W165?C/W
170?C/W(0.125"lead)
θja(Junction to Case)n/a80?C/W n/a
LM136-2.5/LM236-2.5/LM336-2.5V
https://www.wendangku.net/doc/6f9872251.html,
3
Electrical Characteristics
(Note 3)(Continued)
Note 3:Unless otherwise specified,the LM136-2.5is specified from ?55?C ≤T A ≤+125?C,the LM236-2.5from ?25?C ≤T A ≤+85?C and the LM336-2.5from 0?C ≤T A ≤+70?C.
Note 4:Temperature stability for the LM336and LM236family 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 V ref from 25?C to T A (min)or T A (max).
L M 136-2.5/L M 236-2.5/L M 336-2.5V
https://www.wendangku.net/doc/6f9872251.html, 4
Typical Performance Characteristics
Reverse Voltage Change
Zener Noise Voltage
0057152100571522
Dynamic Impedance Response Time
0057152300571524
Reverse Characteristics Forward Characteristics
0057152500571526
LM136-2.5/LM236-2.5/LM336-2.5V
https://www.wendangku.net/doc/6f9872251.html,
5
Typical Performance Characteristics (Continued)
Temperature Drift
00571527
Application Hints
The LM136series voltage references are much easier to use than ordinary zener diodes.Their low impedance and wide operating current range simplify biasing in almost any circuit.Further,either the breakdown voltage or the temperature coefficient can be adjusted to optimize circuit performance.Figure 1shows an LM136with a 10k potentiometer for adjusting the reverse breakdown voltage.With the addition of R1the breakdown voltage can be adjusted without affect-ing the temperature coefficient of the device.The adjustment range is usually sufficient to adjust for both the initial device tolerance and inaccuracies in buffer circuitry.
If minimum temperature coefficient is desired,two diodes can be added in series with the adjustment potentiometer as shown in Figure 2.When the device is adjusted to 2.490V the temperature coefficient is minimized.Almost any silicon signal diode can be used for this purpose such as a 1N914,1N4148or a 1N457.For proper temperature compensation the diodes should be in the same thermal environment as the LM136.It is usually sufficient to mount the diodes near the LM136on the printed circuit board.The absolute resis-tance of R1is not critical and any value from 2k to 20k will work.
00571528
FIGURE 1.LM136With Pot for Adjustment
of Breakdown Voltage
(Trim Range =±120mV typical)
00571529
FIGURE 2.Temperature Coefficient Adjustment
(Trim Range =±70mV typical)
L M 136-2.5/L M 236-2.5/L M 336-2.5V
https://www.wendangku.net/doc/6f9872251.html, 6
Application Hints(Continued)
Low Cost2Amp Switching Regulator?
00571505 *L160turns#16wire on Arnold Core A-254168-2
?Efficiency≈80%
Precision Power Regulator with Low Temperature Coefficient
00571513
5V Crowbar
00571514
Trimmed2.5V Reference with
Temperature Coefficient Independent
of Breakdown Voltage
00571515
*Does not affect temperature coefficient
LM136-2.5/LM236-2.5/LM336-2.5V
https://www.wendangku.net/doc/6f9872251.html,
7
Application Hints
(Continued)
Adjustable Shunt Regulator
00571506
Linear Ohmmeter
00571516
L M 136-2.5/L M 236-2.5/L M 336-2.5V
https://www.wendangku.net/doc/6f9872251.html, 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
LM136-2.5/LM236-2.5/LM336-2.5V
https://www.wendangku.net/doc/6f9872251.html,
9
Schematic Diagram
00571501
L M 136-2.5/L M 236-2.5/L M 336-2.5V
https://www.wendangku.net/doc/6f9872251.html, 10
Physical Dimensions
inches (millimeters)
unless otherwise noted
Order Number LM136H-2.5,LM136H-2.5/883,LM236H-2.5,LM136AH-2.5,LM136AH-2.5/883or LM236AH-2.5
NS Package Number H03H
Small Outline (SO)Package (M)
Order Number LM236M-2.5,LM236AM-2.5,LM336M-2.5or LM336BM-2.5
NS Package Number M08A
LM136-2.5/LM236-2.5/LM336-2.5V
https://www.wendangku.net/doc/6f9872251.html,
11
Physical Dimensions
inches (millimeters)unless otherwise noted (Continued)
TO-92Plastic Package (Z)
Order Number LM336Z-2.5or LM336BZ-2.5
NS Package Number Z03A
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 https://www.wendangku.net/doc/6f9872251.html,.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@https://www.wendangku.net/doc/6f9872251.html, Tel:1-800-272-9959
National Semiconductor
Europe Customer Support Center
Fax:+49(0)180-5308586Email:europe.support@https://www.wendangku.net/doc/6f9872251.html,
Deutsch Tel:+49(0)6995086208English Tel:+44(0)8702402171Fran?ais Tel:+33(0)141918790
National Semiconductor Asia Pacific Customer Support Center
Email:ap.support@https://www.wendangku.net/doc/6f9872251.html,
National Semiconductor
Japan Customer Support Center Fax:81-3-5639-7507
Email:jpn.feedback@https://www.wendangku.net/doc/6f9872251.html, Tel:81-3-5639-7560
https://www.wendangku.net/doc/6f9872251.html,
L M 136-2.5/L M 236-2.5/L M 336-2.5V R e f e r e n c e D i o d e