LM185BYH12 National Semiconductor, LM185BYH12 Datasheet

LM185BYH12

Manufacturer Part Number

LM185BYH12

Description

TO-46

Manufacturer

National Semiconductor

Datasheet

1.LM185BYH12.pdf (10 pages)

Specifications of LM185BYH12

Date_code

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LM185-1.2/LM285-1.2/LM385-1.2

Micropower Voltage Reference Diode

General Description

The LM185-1.2/LM285-1.2/LM385-1.2 are micropower 2-ter-

minal band-gap voltage regulator diodes. Operating over a

10μA to 20mA current range, they feature exceptionally low

dynamic impedance and good temperature stability. On-chip

trimming is used to provide tight voltage tolerance. Since the

LM185-1.2 band-gap reference uses only transistors and re-

sistors, low noise and good long term stability result.

Careful design of the LM185-1.2 has made the device excep-

tionally tolerant of capacitive loading, making it easy to use in

almost any reference application. The wide dynamic operat-

ing range allows its use with widely varying supplies with

excellent regulation.

The extremely low power drain of the LM185-1.2 makes it

useful for micropower circuitry. This voltage reference can be

used to make portable meters, regulators or general purpose

analog circuitry with battery life approaching shelf life.

Further, the wide operating current allows it to replace older

references with a tighter tolerance part.

Connection Diagrams

LM385BXM-1.2 or LM385BYM-1.2

LM385BXZ-1.2 or LM385BYZ-1.2

LM285BXM-1.2, LM285BYM-1.2

See NS Package Number M08A

See NS Package Number Z03A

LM285BXZ-1.2, LM285BYZ-1.2

Order Number LM285M-1.2,

Order Number LM285Z-1.2,

LM385M-1.2, LM385BM-1.2

LM385Z-1.2, LM385BZ-1.2

Plastic Package (Z)

Bottom View

SO Package

T0-92

551810

551809

5518

* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to

Pin 2 or left floating.

The LM185-1.2 is rated for operation over a −55°C to 125°C

temperature range while the LM285-1.2 is rated −40°C to 85°

C and the LM385-1.2 0°C to 70°C. The LM185-1.2/LM285-1.2

are available in a hermetic TO-46 package and the

LM285-1.2/LM385-1.2 are also available in a low-cost TO-92

molded package, as well as SO and SOT-23. The LM185-1.2

is also available in a hermetic leadless chip carrier package.

Features

■

±1% and 2% initial tolerance

Operating current of 10μA to 20mA

1Ω dynamic impedance

Low temperature coefficient

Low voltage reference—1.235V

2.5V device and adjustable device also available

LM185-2.5 series and LM185 series, respectively

Order Number LM185H-1.2, LM185H-1.2/883,

See NS Package Number MF03A

See NS Package Number H02A

LM185BXH-1.2, LM185BYH-1.2

LM285H-1.2 or LM285BXH-1.2

Order Number LM385M3-1.2

Metal Can Package (H)

Bottom View

SOT23

TO-46

551833

551806

January 30, 2008

www.national.com

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