Hi!  well I buy the max1480bcpi in qty 100, for usually $12-ish.  But=20
still.  Spendy.

The ROE-0505S is a great tip.  At $2.72/qty 100 @ mouser it is hard to=20
justify a roll your own solution.  And having 5V on the isolated side=20
(vs. 4.something meaning 3.3V LDO required) makes for cheaper rs485=20
chips as well, since there is a curiously large, like $1 or more,=20
premium for 3.3V rs485 vs. 5V rs485 transceivers, at least 2 years ago=20
this was the case.  So that fact makes the ROE-0505S be even more=20
compelling.  Thank you.

J


Denny Esterline wrote:
>> This project also needs isolated rs485 (for DMX in/out), and rather than
>> using the convenient but expensive MAX1480BCPI all-in-one chip as I have
>>
>
> Ouch! $27 ea at Mouser.
>
>
>> been doing, I'd like to make my own little iso dc/dc to save $ and
>> likely boardspace and avoid Maxim availability issues.
>>
>>
> Take a look at ROE-0505S. 5v in, 5v isolated out at 200mA, $3.60 in singl=
es.
> Lots of lots alternatives too. Makes it a bit tough to cost justify a
> roll-your-own solution.
>
> -Denny
>
--=20
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