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Original question:

UA78: About TO-263 package thermal information.

UA78: I would like to know the difference between UA family and LM family.

R.Fukunaga
Expert 2065 points
Part Number: UA78
Other Parts Discussed in Thread: LM79, UA79, , LM7800

Hi all,

I would like to know the difference between UA family and LM family.

UA78 and UA79 family become EOL, So my cutomer will replace UA family to LM78, LM79 family.

Are there any distinctive differences between each series?

I would like to explain that "Clarify the differences between family and not much different from other family."

Please tell me the characteristics of each family and if there is a clear difference.

[target product]

・UA7805CKCS → LM7805CT
・UA7805CKTTR → LM7805SX
・UA7905CKCS → LM7905CT

I would appreciate it if you could give me some helpful information by tomorrow.

Best Regards,

Ryusuke

  • +1
    TI__Expert 5286 points

    Hello Ryusuke,

    They are p2p replacements with a few  differences. Please see comparison table below.

      UA78 LM7800
    Iout(Max)(A) 1.5 1.5
    Vin(Max)(V) 38 30
    Vin(Min)(V) 7 7.5
    Vout(Max)(V) 24 15
    Vout(Min)(V) 5 5
    Fixed output options(V) 5, 8, 10, 12, 15, 24 5, 12, 15
    PSRR @ 100
    KHz(dB)    		 40 48
    Noise(uVrms) 52 40
    Accuracy(%) 3.75 3
    Dropout voltage
    (Vdo)(Typ)(mV)    		 2000 2000
    Iq(Typ)
    (mA)    		 4.3 6
    Output capacitor type      Cap Free, Non-Ceramic Ceramic, Non-Ceramic
    Thermal resistance
    θJA(°C/W)    		 22 24
    Operating temperature
    range(C)    		 0 to 125 -40 to 125, 0 to 125
    Package size: mm2 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|3), 87 mm2: 8.59 x 10.16 (TO-220|3), 88 mm2: 8.7 x 10.16 (TO-220|3) 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|3), 46 mm2: 7 x 6.5 (SOT-223|4), 47 mm2: 4.58 x 10.16 (TO-220|3)
    Packages DDPAK/TO-263|3, TO-220|3, TO-220|3 DDPAK/TO-263|3, SOT-223|4, TO-220|3

    Thanks,

    Prakash L