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ULN2003A: Estimation on Maximum Collector Current at Ta=60Cmax, NS package

Takeshi Sasaki
Expert 4480 points
Part Number: ULN2003A

Hi team,

Could you give me estimation on maximum collector current at following condition? Is it correct that the customer can refer to Figure 5 in NS package?

<Condition>

Ta=60Cmax

N=2, Duty cycle=100%

NS package

The Figure 5 shows about 300mA as maximum corrector current at N=2, 100% duty, at Ta=85C. So, they want to confirm if the Ta difference between Ta=85C in the datasheet and Ta=60C in the customer's system can provide larger drive current more than 300mA. If so, the customer wants to estimate how large maximum current more than 300mA at lower Ta condition (85C -> 60C). 

Or if TI has any maximum collector current vs duty cycle graphs with different Ta other than 85C, could you share it with me for the customer to estimate the maximum collector current?

Best regards,

Takeshi Sasaki

  • 0
    TI__Mastermind 32650 points

    Sasaki-san,

    Unfortunately, we do not have the data requested. 

    By some linear interpolation, it is possible to estimate that the current per channel will increase as the ambient temperature decreases as there is more heatsinking capability in the system. I approximate that pushing 400mA through each channel should be possible but please note this is not guarenteed by TI and is only for design reference.

    Keeping the current per channel under 300mA would be best.

    Thanks,

    Shreyas