LM385M3X-1.2 National Semiconductor, LM385M3X-1.2 Datasheet
LM385M3X-1.2
Manufacturer Part Number
LM385M3X-1.2
Description
IC VREF MICROPWR DIODE SOT23-3
Manufacturer
National Semiconductor
Specifications of LM385M3X-1.2
Reference Type
Shunt
Voltage - Output
1.235V
Tolerance
±2%
Temperature Coefficient
150ppm/°C
Number Of Channels
1
Current - Cathode
20µA
Current - Output
20mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
TO-236-3, SC-59, SOT-23-3
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Input
-
Current - Quiescent
-
Other names
LM385M3X-1.2TR
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© 2005 National Semiconductor Corporation
LM185-1.2/LM285-1.2/LM385-1.2
Micropower Voltage Reference Diode
General Description
The
2-terminal band-gap voltage regulator diodes. Operating
over a 10µA to 20mA current range, they feature exception-
ally 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 transis-
tors and resistors, low noise and good long term stability
result.
Careful design of the LM185-1.2 has made the device ex-
ceptionally tolerant of capacitive loading, making it easy to
use in almost any reference application. The wide dynamic
operating 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
LM185-1.2/LM285-1.2/LM385-1.2
LM385BXZ-1.2 or LM385BYZ-1.2
See NS Package Number Z03A
LM285BXZ-1.2, LM285BYZ-1.2
Order Number LM285Z-1.2,
LM385Z-1.2, LM385BZ-1.2
Plastic Package (Z)
Bottom View
T0-92
00551810
DS005518
are
micropower
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
n
n Operating current of 10µA to 20mA
n 1Ω dynamic impedance
n Low temperature coefficient
n Low voltage reference — 1.235V
n 2.5V device and adjustable device also available
n LM185-2.5 series and LM185 series, respectively
* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected
to Pin 2 or left floating.
±
1% and 2% initial tolerance
See NS Package Number MF03A
Order Number LM385M3-1.2
SOT23
00551833
February 2005
www.national.com
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