National Semiconductor LM136-2.5, LM236-2.5, LM336-2.5V Technical data

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

00571510

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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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