Any alternative for LFB182G45BG2D280 balun? (Lead time is a lot)

vinod s

Other Parts Discussed in Thread: CC2540

Hi,

Because TI suggested to use LFB182G45BG2D280 (murata), I am worried to play with an alternative. But unfortunately it is having around 14 week lead time. Is there any alternative for this which is readily available?

over 9 years ago

0 Kevin Lockwood over 9 years ago

Expert 1035 points

Ti also recommend the Johanson 2450BM15A0002E balun which is a similar footprint. I've also had better performance out of an ST balun which is also matched for a CC2540 radio. ST part#: BAL-025-01D3. Its cheaper, smaller footprint and has better insertion loss specs then the Murata or Johanson parts

0 vinod s over 9 years ago in reply to Kevin Lockwood

Intellectual 260 points

Yes now I noticed that in the cc2540 dongle they have used the Johanson balun. Also it seems to be same footprint, but need to verify it. Also it is available in bulk without any leadtime. I think I should go with the johanson part.

I checked the ST part but seems to be expensive than the Johanson balun.

0 Kevin Lockwood over 9 years ago in reply to vinod s

Expert 1035 points

My apologies I wrote the wrong part#. The ST part should be BAL-CC25-01D3. Which is considerably cheaper than the Johanson part.

0 Fredrik K over 9 years ago

TI__Guru** 106705 points

Hi Vinod,

There is an alternative from TDK as well. I do not remember the part number, but you can contact your local disty for details.

Cheers,

Fredrik

0 Fredrik K over 9 years ago in reply to vinod s

TI__Guru** 106705 points

The Johanson balun is in a 0805 package, wheras the Murata and TDK balun is in 0603. Pin out is similar for all three.

The ST balun comes in WCSP I think, but I am not sure as we have never evaluated that part.

Cheers,
Fredrik

0 vinod s over 9 years ago in reply to Kevin Lockwood

Intellectual 260 points

Hi, how big difference will it make if I am not considering the passives in between balun and inverted f antenna? How will I fine tune it? The St part seems to be cheaper! I have one more question, why people not considering dipole antenna directly at the differential end?

0 Fredrik K over 9 years ago in reply to vinod s

TI__Guru** 106705 points

Hi Vinod,

All the baluns should be a direct fit to the CC254x and should have 50 ohm output, so no tuning of the balun should be required.

Dipole antenna is of course also an option, but filtering of harmonic emission can be a bit tricky. See this app.note for details: www.ti.com/lit/swra421

Cheers,
Fredrik

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Any alternative for LFB182G45BG2D280 balun? (Lead time is a lot)