Thanks for the heads up.  I designed a board years ago, using a=20
PowerTrends 78SR105, and am now being asked to redo it.  TI bought=20
PowerTrends, and the 78SR105 has gone from ~$10 to ~27!  I was=20
considering doing a discrete (relatively) switcher, but now I see that=20
OKI makes a 78SR-5 good for 1.5A, available from Digikey and Mouser for=20
$3.93.  I will check out the one you mentioned as well. Or not.  On=20
closer examination, the one you mentioned is only good to 20V, my=20
machine runs on 24V.


Kerry



RussellMc wrote:
> Plug into std 3 terminal regulator TO220 pinout.
> Similar power specs.
> Cost unknown (when you find out come back and tell me).
>
> http://www.micropowerdirect.com/PDF%20Files/Datasheets/Noniso/SRM7810-Dat=
asheet.pdf
>
> Nothing you couldn't do yourself but it's nu\ice to have it done for you.
>
> 90% + efficiency across a lot of the envelope.
>
> 5V and 3v3 out versions.
>
> SMD DIP like 1 Watt smps
>
>
> http://www.micropowerdirect.com/PDF%20Files/Datasheets/DCDC/LF/LCP100E-Da=
tasheet.pdf
>
>
>
> _________________
>
> These converters are specifically designed to replace inefficient linear
> regulators (LM78xx type) for board level applications that require miniat=
ure
> size, high efficiency, high reliability and low cost.
>
>
>
> Two standard models operate over an input range of 4.75 to 20 VDC, provid=
ing
> tightly regulated outputs of 3.3 or 5 VDC. Output current for all models =
is
> 1A. Standard features include efficiency as high as 93%, very low noise
> operation and tight line/load regulation. All models feature over load
> protection, over temperature protection and continuous short circuit
> protection. The MTBF for both models (per MIL HDBK 217F) is greater than =
2.0
> Mhours.
>
>
>
> The SRM7810 family is packaged in a miniature, Single-Inline-Package (SIP=
)
> case that is only 0.45
> x 0.30 x 0.40 inches. They feature an industry standard pin-out and all c=
ase
> materials meet UL94-VO.
> Each model is specified for operation over the wide operating temperature
> range of -40=B0C to +70=B0C with no derating or heat sinking required (de=
rated
> operation to +85=B0C is specified). Cooling is by free-air convection.
>
>
>
> The SRM7810 series offers an ideal combination of miniature size, robust
> performance and low cost. They are an ideal replacement for inefficient
> linear POL regulators (which typically need heat sinking and/or airflow),
> providing reliable operation over a wide operating temperature range with=
out
> any need of external heat sinking or board layout changes. Applications
> would include industrial process systems, remote or battery backed system=
s,
> test/lab instrumentation, robotic systems and board level power distribut=
ion
> subsystems.
>
>
>
> *MicroPower Direct** *products are designed to provide long, reliable fie=
ld
> life. Considerable attention is given to the proper selection, derating, =
and
> layout of all circuit components. In addition, extensive reliability
> screening is also performed on all modules as a routine part of our
> production process.
>  =20



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