National Semiconductor | High-performance Analog

 

 LM385-1.2   
Micropower Voltage Reference Diode 		Click link to Download

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

    • 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.

    Also Recommended
    LM385-2.5▲2.5V Fixed Reference Voltage
    LM385-ADJ▲Adjustable Reference Voltage



    Typical Application
    *click for larger image


    		Connection Diagram
    *click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM385-1.2 LM385-2.5 LM385-ADJ
    Initial Accuracy (+/-) Max2 % 3 % 2 %
    Reference Voltage1.235 V 2.5 V Adjustable
    Tempco, max (ppm/C)150 ppm 150 ppm
    Operating Current0.01 mA 0.02 mA 0.01 mA
    Output Current20 mA 20 mA 20 mA
    Temperature Min0 deg C 0 deg C 0 deg C
    Temperature Max70 deg C 70 deg C 70 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LM385-1.2 Micropower Voltage Reference Diode294
    Kbytes    		30-Jan-08日本語  


    Other Technical Documents
    TitleTypeDate
    Practical Implementation of Negative-Input, Negative-Output Step-Down Switching ConvertersExternal Article 2007-07-27
    Choosing between a positive or negative buck topology in a switching regulator designExternal Article 2008-04-25
    Energy Scavenging for Remote SensorsTechnology Edge 2005-11-01

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM385BM-1.2/NOPB

    LM385BM-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1140
    AVNET-EMWorldwide1115
    DIGI-KEYWorldwide2414
    MOUSERWorldwide838
    TAYLORAmericas1140
    		$0.34 each at 1K+ pcsrail
    of
    95
    LM385BMX-1.2/NOPB

    LM385BMX-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    		$0.34 each at 1K+ pcsreel
    of
    2500
    LM385BXM-1.2/NOPB

    LM385BXM-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide950
    AVNET-EMWorldwide992
    DIGI-KEYWorldwide0
    MOUSERWorldwide355
    TAYLORAmericas994
    		$1.11 each at 1K+ pcsrail
    of
    95
    LM385BXMX-1.2/NOPB


    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.11 each at 1K+ pcsreel
    of
    2500
    LM385BXZ-1.2/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1800
    DIGI-KEYWorldwide0
    MOUSERWorldwide1794
    TAYLORAmericas1800
    		$0.81 each at 1K+ pcsbox
    of
    1800
    LM385BYM-1.2/NOPB


    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.70 each at 1K+ pcsrail
    of
    95
    LM385BYMX-1.2/NOPB

    LM385BYMX-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.70 each at 1K+ pcsreel
    of
    2500
    LM385BYZ-1.2/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide43
    DIGI-KEYWorldwide1780
    MOUSERWorldwide1750
    TAYLORAmericas43
    		$0.69 each at 1K+ pcsbox
    of
    1800
    LM385BZ-1.2/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide549
    AVNET-EMWorldwide1174
    BRITESTONESouth Korea188
    DIGI-KEYWorldwide2429
    MOUSERWorldwide1770
    NEWARKAmericas3082
    TAYLORAmericas1184
    TECHMOSAAsia Pacific1800
    		$0.37 each at 1K+ pcsbox
    of
    1800
    LM385M-1.2/NOPB

    LM385M-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide594
    AVNET-EMWorldwide509
    DIGI-KEYWorldwide1610
    MOUSERWorldwide1705
    NEWARKAmericas653
    RS COMPONENTSWorldwide30
    TAYLORAmericas594
    		$0.23 each at 1K+ pcsrail
    of
    95
    LM385M3-1.2/NOPB

    LM385M3-1.2

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide686
    AVNET-EMWorldwide48000
    DIGI-KEYWorldwide1943
    MOUSERWorldwide535
    NEWARKAmericas1789
    TAYLORAmericas2560
    		$0.39 each at 1K+ pcsreel
    of
    1000
    LM385M3X-1.2/NOPB

    LM385M3X-1.2

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide9000
    AVNET-EMWorldwide3000
    DIGI-KEYWorldwide61153
    MOUSERWorldwide2597
    NEWARKAmericas2241
    TAYLORAmericas15665
    TECHMOSAAsia Pacific3000
    		$0.39 each at 1K+ pcsreel
    of
    3000
    LM385MX-1.2/NOPB

    LM385MX-1.2

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide10859
    DIGI-KEYWorldwide7786
    MOUSERWorldwide2500
    TAYLORAmericas10859
    		$0.23 each at 1K+ pcsreel
    of
    2500
    LM385Z-1.2/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide945
    AVNET-EMWorldwide1030
    DIGI-KEYWorldwide6224
    MOUSERWorldwide1093
    NEWARKAmericas1179
    RS COMPONENTSWorldwide1910
    RSL MICROAsia Pacific72000
    TAYLORAmericas5869
    TECHMOSAAsia Pacific1800
    		$0.22 each at 1K+ pcsbox
    of
    1800

    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 LM385-1.2.

    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 LM385-1.2 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM385BM-1.2/NOPB

    LM385BM-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM385
    BM1.2
    LM385BMX-1.2/NOPB

    LM385BMX-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM385
    BM1.2
    LM385BXM-1.2/NOPB

    LM385BXM-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    385BX
    M1.2
    LM385BXMX-1.2/NOPB

    		69.761
    70.001
    		SOIC NARROW81260DetailN/AN/A
    		NSZXTT
    385BX
    M1.2
    LM385BXZ-1.2/NOPB

    		201.661
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    385BX
    Z-1.2
    LM385BYM-1.2/NOPB

    		69.761
    70.001
    		SOIC NARROW81260DetailN/AN/A
    		NSZXTT
    385BY
    M1.2
    LM385BYMX-1.2/NOPB

    LM385BYMX-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    385BY
    M1.2
    LM385BYZ-1.2/NOPB

    		201.662
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    385BY
    Z-1.2
    LM385BZ-1.2/NOPB

    		201.662
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    LM385
    BZ1.2
    LM385M-1.2/NOPB

    LM385M-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM385
    M1.2
    LM385M3-1.2/NOPB

    LM385M3-1.2
    		10.34
    10.399
    		SOT-2331
    1    		260
    260    		DetailN/AN/A
    		R11
    XTT
    LM385M3X-1.2/NOPB

    LM385M3X-1.2
    		10.34
    10.399
    		SOT-2331
    1    		260
    260    		DetailN/AN/A
    		R11
    XTT
    LM385MX-1.2/NOPB

    LM385MX-1.2
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM385
    M1.2
    LM385Z-1.2/NOPB

    		201.662
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    LM385
    Z-1.2

    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 LM385-1.2.

    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 LM385-1.2 is located at RoHS Status.

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM385BM-1.2SLM04404600353250011002356520
    LM385BMX-1.2SLM04404600353250011002356520
    LM385BXM-1.2SLM04404600353250011002356520
    LM385BXMX-1.2SLM04404600353250011002356520
    LM385BXZ-1.2SLM04404600353250011002356520
    LM385BYM-1.2SLM04404600353250011002356520
    LM385BYMX-1.2SLM04404600353250011002356520
    LM385BYZ-1.2SLM04404600353250011002356520
    LM385BZ-1.2SLM04404600353250011002356520
    LM385M-1.2SLM04404600353250011002356520
    LM385M3-1.2LB30003437100416450011181688246
    LM385M3X-1.2LB30003437100416450011181688246
    LM385MX-1.2SLM04404600353250011002356520
    LM385Z-1.2SLM04404600353250011002356520

    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 LM385-1.2.

    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 LM385-1.2 is located at RoHS Status.

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