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LM285-1.2 Dataheets PDF



Part Number LM285-1.2
Manufacturers National Semiconductor
Logo National Semiconductor
Description Micropower Voltage Reference Diode
Datasheet LM285-1.2 DatasheetLM285-1.2 Datasheet (PDF)

LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode May 2003 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-terminal 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 transist.

  LM285-1.2   LM285-1.2



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LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode May 2003 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-terminal 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 resistors, low noise and good long term stability result. Careful design of the LM185-1.2 has made the device exceptionally 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. 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 n n n n n ± 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 Connection Diagrams T0-92 Plastic Package (Z) SOT23 00551833 00551810 Bottom View Order Number LM285Z-1.2, LM285BXZ-1.2, LM285BYZ-1.2 LM385Z-1.2, LM385BZ-1.2 LM385BXZ-1.2 or LM385BYZ-1.2 See NS Package Number Z03A * Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating. Order Number LM385M3-1.2 See NS Package Number MF03A © 2004 National Semiconductor Corporation DS005518 www.national.com LM185-1.2/LM285-1.2/LM385-1.2 Connection Diagrams SO Package (Continued) TO-46 Metal Can Package (H) 00551806 00551809 Order Number LM285M-1.2, LM285BXM-1.2, LM285BYM-1.2 LM385M-1.2, LM385BM-1.2 LM385BXM-1.2 or LM385BYM-1.2 See NS Package Number M08A Bottom View Order Number LM185H-1.2, LM185H-1.2/883, LM185BXH-1.2, LM185BYH-1.2 LM285H-1.2 or LM285BXH-1.2 See NS Package Number H02A www.national.com 2 LM185-1.2/LM285-1.2/LM385-1.2 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 2) Reverse Current Forward Current Operating Temperature Range (Note 3) LM.


LM285 LM285-1.2 LM285-1.2V


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