Re: ULN2803 or equivalent in SMD package? TI's???

From: Mike Page (mike_at_SCRUBeclectic-CAPSweb.BLAMEco.SWENuk)
Date: 07/25/04 

Date: Sun, 25 Jul 2004 19:20:33 +0100

Lewin Edwards wrote:

>>>I'm having difficulty finding a surface-mount replacement for the
>>>venerable ULN2803 (octal Darlington driver, 50V max, 500mA per driver,
>>
>> Alegro has taken them of the market (almost)
>> http://www.allegromicro.com/sf/2801/
>
>
> Right... However TI and Toshiba (and I think ST?) list them as current
> production without caveats.
>
> The problem is finding a replacement with similar characteristics. I
> think that the target applications for these devices are being filled by
> ASSP microcontrollers with high-current drivers built in.

ULN2803 - like all darlingtons - drop around 1V. This can make them
marginal in 5V systems, let alone lower voltages.

> It's simple enough to build something out of discrete components, but
> it's easier to use an off-the-shelf part like the ULN28xx.
>

"Digital" transistors are very easy indeed. 

-- 
Mike Page BEng(Hons) MIEE           www.eclectic-web.co.uk
Quiet! Tony's battling the forces of conservatism, whoever we are.

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