Datasheet LM136-2.5, LM236-2.5, LM336-2.5V Datasheet (National Semiconductor)

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 low­temperature-coefficient 2.5V zener with 0.2Ω dynamic im­pedance. A third terminal on the LM136-2.5 allows the 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 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 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 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

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

June 2005

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,

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

© 2005 National Semiconductor Corporation DS005715 www.national.com

Typical Applications

2.5V Reference

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

00571509

2.5V Reference with Minimum
Temperature Coefficient

Wide Input Range Reference

00571511

†

Adjust to 2.490V

*

Any silicon signal diode

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

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

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

Reverse Breakdown
Change

With Current 400 µA≤IR≤10 mA

Reverse Dynamic
Impedance

Temperature Stability V

(Note 4) I

Reverse Breakdown
Change

With Current

Reverse Dynamic
Impedance

Long Term Stability TA=25˚C±0.1˚C, IR=1 mA, 20 20 ppm

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

T

=25˚C, IR=1 mA

A

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

T

=25˚C, 2.6 6 2.6 10 mV

A

T

=25˚C, IR=1 mA, f = 100 Hz 0.2 0.6 0.2 1 Ω

A

Adjusted to 2.490V

R

=1 mA, Figure 2

R

0˚C≤T

≤70˚C (LM336) 1.8 6 mV

A

−25˚C≤T

≤+85˚C 3.5 9 mV

A

(LM236H, LM236Z)

−25˚C ≤ T

−55˚C≤T

400 µA≤I

I

=1 mA 0.4 1 0.4 1.4 Ω

R

≤ +85˚C (LM236M) 7.5 18 mV

A

≤+125˚C (LM136) 12 18 mV

A

≤10 mA 3 10 3 12 mV

R

t = 1000 hrs

max is:

j

LM136 150˚C

LM236 125˚C

LM336 100˚C

Thermal Resistance TO-92 TO-46 SO-8

θ

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

ja

170˚C/W (0.125" lead)

θ

(Junction to Case) n/a 80˚C/W n/a

ja

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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

≤ T

≤ +70˚C.

A

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 V
from 25˚C to TA(min) or TA(max).

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

ref

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Typical Performance Characteristics

Reverse Voltage Change Zener Noise Voltage

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

00571521

Dynamic Impedance Response Time

00571523

Reverse Characteristics Forward Characteristics

00571522

00571524

00571525 00571526

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Typical Performance
Characteristics

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

(Continued)

Temperature Drift

00571527

Application Hints

The LM136 series 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 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 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,
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.

00571528

FIGURE 1. LM136 With Pot for Adjustment

of Breakdown Voltage

(Trim Range =

FIGURE 2. Temperature Coefficient Adjustment

(Trim Range =

±

120 mV typical)

00571529

±

70 mV typical)

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Application Hints (Continued)

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

*

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

†

Efficiency ≈ 80%

Precision Power Regulator with Low Temperature Coefficient

Low Cost 2 Amp Switching Regulator

†

00571505

5V Crowbar

00571514

00571513

Trimmed 2.5V Reference with

Temperature Coefficient Independent

of Breakdown Voltage

*

Does not affect temperature coefficient

00571515

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Application Hints (Continued)

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

Adjustable Shunt Regulator

00571506

Linear Ohmmeter

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00571516

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

Application Hints (Continued)

Op Amp with Output Clamped

Bipolar Output Reference

2.5V Square Wave Calibrator

00571519

5V Buffered Reference

00571517

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00571530

Low Noise Buffered Reference

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Schematic Diagram

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

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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

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

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)

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

TO-92 Plastic Package (Z)

Order Number LM336Z-2.5 or 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.

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