Datasheet LM336MX-2.5, LM336M-2.5, LM336-2.5CMWC, LM336BZ-2.5, LM336BMX-2.5 Datasheet (NSC)

LM136-2.5/LM236-2.5/LM336-2.5V
Reference Diode

General Description

The LM136-2.5/LM236-2.5 and LM336-2.5 integrated cir­cuits are precision 2.5V shunt regulator diodes. These
monolithic IC voltage references operate as a
low-temperature-coefficient 2.5V zener with 0.2Ω dynamic
impedance. A third terminal onthe LM136-2.5 allowsthe ref­erence 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 toobtain 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 tem­perature range.

The LM336-2.5 is rated for operation over a 0˚C to +70˚C
temperature range. See the connection diagrams for avail­able packages.

Features

n Low temperature coefficient
n Wide operating current of 400 µAto 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
n Three lead transistor package

Connection Diagrams

TO-92

Plastic Package

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Bottom View

Order Number LM236Z-2.5,

LM236AZ-2.5, LM336Z-2.5 or LM336BZ-2.5

See NS Package Number Z03A

TO-46

Metal Can Package

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Bottom View

Order Number LM136H-2.5,

LM136H-2.5/883, LM236H-2.5,

LM136AH-2.5, LM136AH-2.5/883

or LM236AH-2.5

See NS Package Number H03H

May 1998

LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode

© 1999 National Semiconductor Corporation DS005715 www.national.com

Connection Diagrams (Continued)

Typical Applications

SO Package

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Top View

Order Number LM236M-2.5,

LM236AM-2.5, LM336M-2.5

or LM336BM-2.5

See NS Package Number M08A

2.5V Reference

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2.5V Reference with Minimum
Temperature Coefficient

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†

Adjust to 2.490V

*

Any silicon signal diode

Wide Input Range Reference

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National SemiconductorSales 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

TO-92 Package (10 sec.) 260˚C
TO-46 Package (10 sec.) 300˚C
SO Package

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 T

A

=

25˚C, I

R

=

1mA
LM136, LM236, LM336 2.440 2.490 2.540 2.390 2.490 2.590 V
LM136A, LM236A, LM336B 2.465 2.490 2.515 2.440 2.490 2.540 V

Reverse Breakdown Change T

A

=

25˚C, 2.6 6 2.6 10 mV

With Current 400 µA≤I

R

≤10 mA

Reverse Dynamic Impedance T

A

=

25˚C, I

R

=

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

−25˚C≤T

A

≤+85˚C 3.5 9 mV

(LM236H, LM236Z)

−25˚C ≤ T

A

≤ +85˚C (LM236M) 7.5 18 mV

−55˚C≤T

A

≤+125˚C (LM136) 12 18 mV

Reverse Breakdown Change 400 µA≤I

R

≤10 mA 3 10 3 12 mV
With Current
Reverse Dynamic Impedance I

R

=

1 mA 0.4 1 0.4 1.4 Ω

Long Term Stability T

A

=

25˚C

±

0.1˚C, I

R

=

1 mA, 20 20 ppm

t=1000 hrs

Note 1: Absolute Maximum Ratings indicatelimits beyond which damage to the device may occur. Electrical specificationsdo 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

θ

ja

(Junction to Ambient) 180˚C/W (0.4" leads) 440˚C/W 165˚C/W

170˚C/W (0.125" lead)

θ

ja

(Junction to Case) n/a 80˚C/W n/a

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
≤ T

A

≤ +70˚C.

Note 4: Temperature stability for the LM336 and LM236 family isguaranteed by design. Design limits are guaranteed (but not 100%production tested) over the in-
dicated temperature and supplyvoltageranges.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 TA(max).

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Typical Performance Characteristics

Reverse Voltage Change

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Zener Noise Voltage

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Dynamic Impedance

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Response Time

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Reverse Characteristics

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Forward Characteristics

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Temperature Drift

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Application Hints

The LM136 series voltage references aremuch easier touse
than ordinary zener diodes. Their low impedance and wide
operating current range simplifybiasing inalmost anycircuit.
Further,either the breakdown voltage orthe temperatureco­efficient can be adjusted to optimize circuit performance.

Figure 1

shows an LM136 with a 10k potentiometer for ad­justing the reverse breakdown voltage. With the addition of
R1 the breakdown voltage can be adjusted without affecting
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 addedin 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,
1N4148 or 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 LM136 on the printed circuit board. The absolute resis­tance of R1 is not critical and any value from 2k to 20k will
work.

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FIGURE 1. LM136 With Pot for Adjustment

of Breakdown Voltage

(Trim Range

=

±

120 mV typical)

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FIGURE 2. Temperature Coefficient Adjustment

(Trim Range

=

±

70 mV typical)

Low Cost 2 Amp Switching Regulator

†

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*

L1 60 turns#16 wire on Arnold Core A-254168-2

†

Efficiency ≈ 80

%

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Application Hints (Continued)

Precision Power Regulator with Low Temperature Coefficient

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5V Crowbar

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Trimmed 2.5V Reference with

Temperature Coefficient Independent

of Breakdown Voltage

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*

Does not affect temperature coefficient

Adjustable Shunt Regulator

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Application Hints (Continued)

Linear Ohmmeter

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Application Hints (Continued)

Op Amp with Output Clamped

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Bipolar Output Reference

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2.5V Square Wave Calibrator

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5V Buffered Reference

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Low Noise Buffered Reference

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Schematic Diagram

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10

Physical Dimensions inches (millimeters) unless otherwise noted

Order Number LM136H-2.5, LM136H-2.5/883, LM236H-2.5, LM136AH-2.5, LM136AH-2.5/883 or LM236AH-2.5

NS Package Number H03H

Small Outline (SO) Package (M)

Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5

NS Package Number M08A

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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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 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 orsustain life,and whosefail­ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected toresult ina 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 tocause the failure of the life support
device or system, orto affectits safety or effectiveness.

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TO-92 Plastic Package (Z)

Order Number LM236Z-2.5, LM236AZ-2.5, LM336Z-2.5 or LM336BZ-2.5

NS Package Number Z03A

LM136-2.5/LM236-2.5/LM336-2.5V 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.