MAX756 inductor substitutes

[Rubicon]

Hello,

Could anyone suggest replacement inductors for the ones specified in
the MAX756 datasheet? My attmept to find the inductors at Farnell
Australia was a complete faliure as their search engine is lousy -
search for 22uH and get 220uH/22uH/2.2uH/0.22uH... with partially
loading pages (96 results and only 22 on the page, no other pages
listed) and frames all out of line. They also don't stock the
specified brand names.

It's my first go at the MAX756 DC-DC converter and as the're not
available in NZ, nor the 1N5817 Schottky diodes (1N5819 are) I have to
get them from Farnell Australia so I'm trying for the inductors too.

Any tips with their usage (about 40mA) is appreciated.

22uH INDUCTOR
Sumida CD54-220 surface mount
CoilCraft DT3316-223 surface mount
Coiltronics CTX20-1 surface mount
Sumida RCH654-220 miniature through-hole
10uH INDUCTOR
Sumida CD54-100 surface mount

Peak switch current limit of the 756 is stated on the datasheet at
1.2A worst case and the inductor DC resistance needs to be 0.03R or
less.

I did manage to find two candidates at Farnell. The first looks O.K
but the second is certainly not cheap!

PF Part Number: 178330
Manufacturer: FERROPERM
Manufacturer Part Number: 1585 10uH 3A INS
INDUCTOR, AXIAL 10UH 3A; Case style: Axial; Current, DC max: 3A;
Frequency, resonant: 70MHz; Inductance: 10µH; Resistance: 0.025R;
Tolerance, +: ± 20%; Tolerance, -: 20%; Diameter, body: 7.5mm;
Diameter, lead: 0.7mm; Len
Pack Size: 1
Order Multiple Quantity: 5
Price 5-49 AUD$5.90

PF Part Number: 482560
Manufacturer: C & D TECHNOLOGIES
Manufacturer Part Number: 1422311
INDUCTOR, 22UH 11A; Case style: Radial; Current, DC max: 11A;
Frequency, resonant: 9.3MHz; Inductance: 22µH; Q factor: 64 @00kHz;
Resistance: 0.012R; Tolerance, +: ± 10%; Tolerance, -: 10%; Diameter,
body: 24mm; Diameter
Pack Size: 1
Order Multiple Quantity: 1
Price 1-9 AUD$10.39

Cheers,

Andrew.

 

[kell]

Hello,

Could anyone suggest replacement inductors for the ones specified in
the MAX756 datasheet? My attmept to find the inductors at Farnell
Australia was a complete faliure as their search engine is lousy -
search for 22uH and get 220uH/22uH/2.2uH/0.22uH... with partially
loading pages (96 results and only 22 on the page, no other pages
listed) and frames all out of line. They also don't stock the
specified brand names.

I don't know if this will help, but nobody else answered you.
How about going to Digikey.com and using their search to find
manufacturers part numbers that you can then look for in Farnell.
Digikey is a U.S. company but maybe some of the manufacturers' parts
will also be available through Farnell.
Navigate the digikey website until you find the "parts search"
function.
There will be a sort of table of contents where you can find the
heading for passives/inductors, then do a parametric search for the
inductors you want.
I haven't found any other supplier's search function that works like
digikey's.

 

[Rubicon]

I don't know if this will help, but nobody else answered you.
How about going to Digikey.com and using their search to find
manufacturers part numbers that you can then look for in Farnell.
Digikey is a U.S. company but maybe some of the manufacturers' parts
will also be available through Farnell.
Navigate the digikey website until you find the "parts search"
function.
There will be a sort of table of contents where you can find the
heading for passives/inductors, then do a parametric search for the
inductors you want.
I haven't found any other supplier's search function that works like
digikey's.

Thanks for the advice. I'll give it a go.

Andrew.