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LM337: What's the difference between LM337 and LM337-N?

Francis Jiang
Intellectual 2000 points
Part Number: LM337
Other Parts Discussed in Thread: , TPS7A33

Tool/software:

Hi Team,

What's the difference between LM337 and LM337-N? Thanks in advance.

BRs,

Francis

  • +1
    TI__Expert 4986 points

    Francis,

    There isn't a lot of differences. However, these are legacy devices and we recommend to use a newer version if possible. "-N" devices were originally from National Semiconductors before TI acquired it.

    Thanks,

    Prakash L

      LM337 LM337-N TPS7A33
    Iout(Max)(A) 1.5 1.5 1
    Vin(Max)(V) -3 -4.2 -3
    Vin(Min)(V) -40 -40 -36
    Vout(Max)(V) -1.2 -1.2 -1.2
    Vout(Min)(V) -37 -37 -33
    Fixed output options(V) --- --- ---
    PSRR @ 100
    KHz(dB)    		 19 35 64
    Noise(uVrms) 1110 38 16
    Accuracy(%) 2.4 2.4 2.5
    Dropout voltage
    (Vdo)(Typ)(mV)    		 2000 2400 290
    Iq(Typ)
    (mA)    		 1.5 0.065 0.21
    Output capacitor type      Non-Ceramic Non-Ceramic Ceramic
    Thermal resistance
    θJA(°C/W)    		 23 23 31
    Operating temperature
    range(C)    		 0 to 125 -40 to 125, 0 to 125 -40 to 125
    Package size: mm2 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|3), 88 mm2: 8.7 x 10.16 (TO-220|3), 67 mm2: 10.11 x 6.6 (TO-252|3) 46 mm2: 7 x 6.5 (SOT-223|4), 47 mm2: 4.58 x 10.16 (TO-220|3), 152 mm2: 10.16 x 14.986 (TO-220|3) 25 mm2: 5 x 5 (VQFN|20)
    Packages DDPAK/TO-263|3, TO-220|3, TO-252|3 SOT-223|4, TO-220|3, TO-220|3 VQFN|20
  • 0 in reply to Prakash Lakhit
    TI__Intellectual 2000 points

    Hi Prakash,

    Thanks for your prompt reply, and have some comments as below:

    • TPS7A33 seems quite complex for designing, although only 7pins are useful, also more complex than SOT-233(4) and TO-223(3).
    • LM337's size is quite big and don't have SOT-223(4).

    So from my understanding, maybe LM337-N is still the most suitable choose for customer now. Any wrong, please feel free to correct me, thank.

    BRs,

    Francis

  • +1 in reply to Francis Jiang
    TI__Expert 4986 points

    Francis,

    Yes, LM337-N can be used by the customer. However, I would like to mention that it's a legacy device. We will have more negative LDO's in the future as we refresh our portfolio.

    Thanks,

    Prakash L