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Product details

Parameters

VO (V) 1.235 Reference voltage Fixed Initial accuracy (Max) (%) 1, 2 Rating Catalog VO adj (Min) (V) 1.235 VO adj (Max) (V) 1.235 Iz for regulation (Min) (uA) 15 Temp coeff (Max) (ppm/ degree C) 150 Operating temperature range (C) 0 to 70 Iout/Iz (Max) (mA) 20 open-in-new Find other Shunt voltage references

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Shunt voltage references

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

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Description

The LM185-1.2-N/LM285-1.2-N/LM385-1.2-N 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-N band-gap reference uses only transistors and resistors, low noise and good long term stability result.

Careful design of the LM185-1.2-N 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-N 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-N is rated for operation over a −55°C to 125°C temperature range while the LM285-1.2-N is rated −40°C to 85°C and the LM385-1.2-N 0°C to 70°C. The LM185-1.2-N/LM285-1.2-N are available in a hermetic TO package and the LM285-1.2-N/LM385-1.2-N are also available in a low-cost TO-92 molded package, as well as SOIC and SOT-23.

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Exact equivalent in functionality and parametrics to the compared device:
LM185-1.2-N ACTIVE Micropower Voltage Reference Diode -55 to 125°C Extended temperature range
LM285-1.2-N ACTIVE 1.235-V, –40°C to +85°C, micropower voltage reference diode -40 to 85 °C Extended temperature range
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM4051-N ACTIVE Fixed & adjustable, precision micropower shunt voltage reference LM4051-N offers fixed and adjustable voltage options at higher initial accuracy and much lower 50 ppm/°C temperature drift.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode datasheet (Rev. E) Apr. 05, 2013
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes AN-715 LM385 Feedback Provides Regulator Isolation (Rev. A) May 06, 2013
Application notes AN-777 LM2577 Three Output, Isolated Flyback Regulator (Rev. B) Apr. 23, 2013
Application notes AN-284 Single-Supply Applications of CMOS MICRODACs (Rev. B) Apr. 22, 2013
More literature Die D/S LM385-1.2 MDC Micropower Voltage Reference Diode Sep. 25, 2012
Application notes TO-92 Packing Options / Ordering Instructions (Rev. A) Jun. 23, 2010
Application notes Negative Buck Switching Regulator (using LM258x) Mar. 21, 2007

Design & development

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Design tools & simulation

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PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
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  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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CALCULATION TOOLS Download
Shunt voltage reference external resistor quick-start calculator
SHUNT_VOLTAGE_REFERENCE_RESISTOR_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 (...)
Features
  • Case-specific tool to calculate external resistor value associated with shunt voltage reference
  • Input fields for: voltage reference, supply voltage, load current and Iq bound values
  • Real-time effects of input values on schematic
  • Quick indicators notifying user of valid and invalid outputs
  • Error messages (...)

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBZ) 3 View options
TO-92 (LP) 3 View options

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