National Semiconductor | High-performance Analog

 

 LM4121   
Precision Micropower Low Dropout Voltage Reference from the PowerWise® Family		 Click link to Download

Features

Small SOT23-5 package

  

Low voltage operation

  

High output voltage accuracy:

0.2%

Source and Sink current output:

±5 mA

Supply current:

160 µA Typ.

Low Temperature Coefficient:

50 ppm/°C

Enable pin

  

Output voltages:

1.25V and Adjustable

Industrial temperature Range:

-40°C to +85°C

(For extended temperature range, -40°C to 125°C, contact National Semiconductor)

  

Description

The LM4121 is a precision bandgap voltage reference available in a fixed 1.25V and adjustable version with up to 5 mA current source and sink capability.

This series reference operates with input voltages as low as 1.8V and up to 12V consuming 160 µA (Typ.) supply current. In power down mode, device current drops to less than 2 µA.

The LM4121 comes in two grades A and Standard. The best grade devices (A) have an initial accuracy of 0.2%, while the standard have an initial accuracy of 0.5%, both with a tempco of 50ppm/°C guaranteed from -40°C to +125°C.

The very low operating voltage, low supply current and power-down capability of the LM4121 makes this product an ideal choice for battery powered and portable applications.

The device performance is guaranteed over the industrial temperature range (-40°C to +85°C), while certain specs are guaranteed over the extended temperature range (-40°C to +125°C). Please contact National for full specifications over the extended temperature range. The LM4121 is available in a standard 5-pin SOT-23 package.


Applications

  • Portable, battery powered equipment
  • Instrumentation and process control
  • Automotive & Industrial
  • Test equipment
  • Data acquisition systems
  • Precision regulators
  • Battery chargers
  • Base stations
  • Communications
  • Medical equipment

    • Also Recommended
    LM4051Lower Current Shunt Reference
    LM4140▲Ultra High Precision Reference
    LM4130Lower Tempco & Current, Better Accuracy



    Typical Application
    *click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM4121 LM4140
    Initial Accuracy (+/-) Max0.2, 0.5 % 0.1 %
    Reference Voltage1.25 V, Adjustable 2.5 V, 1.25 V, 4.096 V, 2.048 V, 1.024 V
    Tempco, max (ppm/C)50 ppm 6, 3, 10 ppm
    Input Min Voltage1.8 Volt 1.8, 2.283, 2.735, 4.366 Volt
    Input Max Voltage14 Volt 5.5 Volt
    Dropout Voltage0.25 Volt 0.195, 0.16 Volt
    Quiescent Current0.16 mA 0.23 mA
    Output Current5 mA 8 mA
    Voltage Noise (rms)30 uV 2.2 uV
    Long Term Stability (ppm/1000hr)100 ppm 60 ppm
    Temperature Min-40 deg C 0 deg C
    Temperature Max85 deg C 70 deg C
    AutomotiveNo No
    PowerWiseYes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM4121 Precision Micropower Low Dropout Voltage Reference436
    Kbytes    		6-Dec-01   

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM4121AIM5-1.2/NOPB

    LM4121AIM5-1.2

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1668
    		$1.00 each at 1K+ pcsreel
    of
    1000
    LM4121AIM5-ADJ/NOPB

    LM4121AIM5-ADJ

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide8736
    FARNELLEurope and Asia1109
    MOUSERWorldwide1975
    NEWARKAmericas1000
    		$1.00 each at 1K+ pcsreel
    of
    1000
    LM4121AIM5X-ADJ/NOPB

    LM4121AIM5X-ADJ

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.00 each at 1K+ pcsreel
    of
    3000
    LM4121IM5-1.2/NOPB

    LM4121IM5-1.2

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide890
    DIGI-KEYWorldwide2414
    MOUSERWorldwide1000
    TAYLORAmericas890
    		$0.65 each at 1K+ pcsreel
    of
    1000
    LM4121IM5-ADJ/NOPB

    LM4121IM5-ADJ

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide1878
    FARNELLEurope and Asia32
    MOUSERWorldwide900
    NEWARKAmericas32
    TAYLORAmericas1000
    		$0.65 each at 1K+ pcsreel
    of
    1000
    LM4121IM5X-ADJ/NOPB

    LM4121IM5X-ADJ

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.65 each at 1K+ pcsreel
    of
    3000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM4121AIM5X-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM4121IM5X-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    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 LM4121.

    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 LM4121 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM4121AIM5-1.2/NOPB

    LM4121AIM5-1.2
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R19A
    XTT
    LM4121AIM5-ADJ/NOPB

    LM4121AIM5-ADJ
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R20A
    XTT
    LM4121AIM5X-ADJ/NOPB

    LM4121AIM5X-ADJ
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R20A
    XTT
    LM4121IM5-1.2/NOPB

    LM4121IM5-1.2
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R19B
    XTT
    LM4121IM5-ADJ/NOPB

    LM4121IM5-ADJ
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R20B
    XTT
    LM4121IM5X-ADJ/NOPB

    LM4121IM5X-ADJ
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		R20B
    XTT

    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 LM4121.

    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 LM4121 is located at RoHS Status.

    CAD Symbols and Models
    Download LM4121 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM4121AIM5-1.2LFAST10201400027850002790251354
    LM4121AIM5-ADJLFAST10201400027850002790251354
    LM4121AIM5X-ADJLFAST10201400027850002790251354
    LM4121IM5-1.2LFAST10201400027850002790251354
    LM4121IM5-ADJLFAST10201400027850002790251354
    LM4121IM5X-ADJLFAST10201400027850002790251354

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    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 LM4121.

    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 LM4121 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM4121AIM5X-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM4121IM5X-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation