Product details

VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1, 2 VO adj (Min) (V) 1.24 VO adj (Max) (V) 5.3 Iz for regulation (Min) (uA) 10 Rating Catalog Temp coeff (Max) (ppm/ degree C) 150 Operating temperature range (C) 0 to 70 Iout/Iz (Max) (mA) 20
VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1, 2 VO adj (Min) (V) 1.24 VO adj (Max) (V) 5.3 Iz for regulation (Min) (uA) 10 Rating Catalog Temp coeff (Max) (ppm/ degree C) 150 Operating temperature range (C) 0 to 70 Iout/Iz (Max) (mA) 20
SOIC (D) 8 19 mm² 4.9 x 3.9 TO-92 (LP) 3 19 mm² 5.2 x 3.68
  • Adjustable from 1.24V to 5.30V
  • Operating Current of 10μA to 20mA
  • 1% and 2% Initial Tolerance
  • 1Ω Dynamic Impedance
  • Low Temperature Coefficient

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  • Adjustable from 1.24V to 5.30V
  • Operating Current of 10μA to 20mA
  • 1% and 2% Initial Tolerance
  • 1Ω Dynamic Impedance
  • Low Temperature Coefficient

All trademarks are the property of their respective owners.

The LM185/LM285/LM385 are micropower 3-terminal adjustable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and 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 band-gap reference uses only transistors and resistors, low noise and good long-term stability result.

Careful design of the LM185 has made the device 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 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 is rated for operation over a −55°C to 125°C temperature range, while the LM285 is rated −40°C to 85°C and the LM385 0°C to 70°C. The LM185 is available in a hermetic TO package and a LCCC package, while the LM285/LM385 are available in a low-cost TO-92 package, as well as SOIC.

The LM185/LM285/LM385 are micropower 3-terminal adjustable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and 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 band-gap reference uses only transistors and resistors, low noise and good long-term stability result.

Careful design of the LM185 has made the device 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 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 is rated for operation over a −55°C to 125°C temperature range, while the LM285 is rated −40°C to 85°C and the LM385 0°C to 70°C. The LM185 is available in a hermetic TO package and a LCCC package, while the LM285/LM385 are available in a low-cost TO-92 package, as well as SOIC.

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Technical documentation

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Type Title Date
* Data sheet LM185/LM285/LM385 Adjustable Micropower Voltage References datasheet (Rev. F) 05 Apr 2013
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note AN-715 LM385 Feedback Provides Regulator Isolation (Rev. A) 06 May 2013
Application note AN-777 LM2577 Three Output, Isolated Flyback Regulator (Rev. B) 23 Apr 2013
Application note AN-284 Single-Supply Applications of CMOS MICRODACs (Rev. B) 22 Apr 2013
Application note TO-92 Packing Options / Ordering Instructions (Rev. A) 23 Jun 2010
Application note Negative Buck Switching Regulator (using LM258x) 21 Mar 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LM385-ADJ PSpice Transient Model

SNVMAB7.ZIP (57 KB) - PSpice Model
Simulation model

LM385-ADJ Unencrypted PSpice Transient Model

SNVMB82.ZIP (1 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt voltage reference external resistor quick-start calculator

This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)
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SOIC (D) 8 View options
TO-92 (LP) 3 View options

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