Features ±20 mV (±0.8%) max. initial tolerance (A grade) Operating current of 20 μA to 20 mA 0.6Ω dynamic impedance (A grade) Low temperature coefficient Low voltage reference—2.5V 1.2V device and adjustable device also available—LM185-1.2 series and LM185 series, respectively Description The LM185-2.5/LM285-2.5/LM385-2.5 are micropower 2-terminal band-gap voltage regulator diodes. Operating over a 20 μA to 20 mA current range, they feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming is used to provide tight voltage tolerance. Since the LM-185-2.5 band-gap reference uses only transistors and resistors, low noise and good long term stability result. Careful design of the LM185-2.5 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 LM185-2.5 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. For applications requiring 1.2V see LM185-1.2. The LM185-2.5 is rated for operation over a −55°C to 125°C temperature range while the LM285-2.5 is rated −40°C to 85°C and the LM385-2.5 0°C to 70°C. The LM185-2.5/LM285-2.5 are available in a hermetic TO-46 package and the LM285-2.5/LM385-2.5 are also available in a low-cost TO-92 molded package, as well as S.O. and SOT-23. The LM185-2.5 is also available in a hermetic leadless chip carrier package.

	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM185-2.5 Micropower Voltage Reference Diode	334 Kbytes	30-Jan-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM185BXH-2.5/NOPB LM185BXH-2.5 RoHS Status	TO-46	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 24 DIGI-KEY Worldwide 0 TAYLOR Americas 24	$15.60 each at 1K+ pcs	box of 1000
LM185BYH-2.5/NOPB LM185BYH-2.5 RoHS Status	TO-46	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$12.50 each at 1K+ pcs	box of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM185-2.5G MW8	NONE	NONE	08 Sep 1999

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM185-2.5.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM185-2.5 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM185BXH-2.5/NOPB LM185BXH-2.5	257.344 257.614	TO-46	2	1 1	NA NA	Detail	N/A	N/A	NSXYTTE# LM185BXH2.5
LM185BYH-2.5/NOPB LM185BYH-2.5	257.344 257.614	TO-46	2	1 1	NA NA	Detail	N/A	N/A	NSXYTTE# LM185BYH2.5

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM185-2.5.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM185-2.5 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM185-2.5G MW8	NONE	NONE	08 Sep 1999