IR receiver modules - Vishay / Kodenshi / Hero

[Dave Marsh]

I'm loking for a supplier of 37.9kHz IR remote control receiver modules that
will run from 3.3V supply (90 degree legs if possible). Suitable ones
include:

Vishay TSOP34838
Kodenshi KSM-2003TM2E
Waitrony PIC-1018SCL
Hero HIM702HM

Anyone know somewhere that might supply 500 for approx UKP 0.30 ($0.55)
each?

Many thanks,

Dave

 

[Mike Harrison]

I'm loking for a supplier of 37.9kHz IR remote control receiver modules that
will run from 3.3V supply (90 degree legs if possible). Suitable ones
include:

Vishay TSOP34838
Kodenshi KSM-2003TM2E
Waitrony PIC-1018SCL
Hero HIM702HM

Anyone know somewhere that might supply 500 for approx UKP 0.30 ($0.55)
each?

Many thanks,

Dave

I've bought the Vishay ones from EBV (www.ebv.com) a while ago - I think they were thirty-something
p each in 1000-off.
(Phoning EBV UK always gets better prices than on the 'stock search' price on their website).
Problem is that the Vishay ones have recently changed part numbers (tsop18xx to tsop364xx), and the
the new ones are taking a while to filter through to stock- probably not really a problem if you can
wait a 4-6 week leadtime but you may have trouble finding some on the shelf.
The Vishay ones are reasonably wide band, so e.g. 36,37 or 38K ones will work OK at 37K.

 

[Lewin A.R.W. Edwards]

Vishay TSOP34838

Anyone know somewhere that might supply 500 for approx UKP 0.30 ($0.55)
each?

Unfortunately you won't get the Vishay part, at least, at that price.
You have to go to a couple of thousand pieces to get a price like
that.

 

[Dave Marsh]

I've bought the Vishay ones from EBV (www.ebv.com) a while ago - I think they were thirty-something
p each in 1000-off.
(Phoning EBV UK always gets better prices than on the 'stock search' price on their website).
Problem is that the Vishay ones have recently changed part numbers

(tsop18xx to tsop364xx), and the

the new ones are taking a while to filter through to stock- probably not really a problem if you can
wait a 4-6 week leadtime but you may have trouble finding some on the shelf.
The Vishay ones are reasonably wide band, so e.g. 36,37 or 38K ones will work OK at 37K.

Thanks Mike. That's very interesting about the Vishay being able to receive
ok away from its nominal frequency. The transmitter is NEC protocol, so
37.9kHz. If a 36/37/38kHz receiver would work then that makes shopping
around a little easier. Does reception distance suffer? It's a normal
consumer app so I guess 10 metres range would be totally adequate (I think
the Vishays are spec'ed at 15 metres).

I searched the EBV.com stock and unfortunately they don't mention any
Vishays quite suitable for us - we need ones that will work from a 3.3V
supply and come in the small through-hole package (the large packages have a
different pinout so it's not really space that is the issue).

Just wondering out loud why there are still so many more IR receivers
stocked everywhere that need 5V supply as opposed to 3.3V?

Dave

 

[Dave Marsh]

Unfortunately you won't get the Vishay part, at least, at that price.
You have to go to a couple of thousand pieces to get a price like
that.

Thank you for the info, Lewin. Saves me hunting too hard for that sort of
price. From usenet and other sources I understand Vishays are well
regarded - I guess that means good reception at distance and in noisy
surroundings. So I'm tempted to go with them even if I find other makes
available a bit cheaper.

Dave

 

[Dave Marsh]

think
they were thirty-something price
on their website).
(tsop18xx to tsop364xx), and the

Just noticed that Farnell (of all people) stock the Vishay TSOP34836 at 47p
($0.84) for 250+ which seems a very good price for off-the-shelf.

This is a 36kHz receiver. Will it really work ok for a 37.9kHz (NEC
protocol) signal?

Thanks
Dave

 

[Lewin A.R.W. Edwards]

price. From usenet and other sources I understand Vishays are well

regarded - I guess that means good reception at distance and in noisy

Buy all you can, when you find them. Stock seems to vary a lot and the
leadtimes SUCK. I speced a TSOP1238 in a product, and all was well
until suddenly the leadtime went to 8 weeks with 0 stock. Switched to
Sharp's equivalent GP1Uxxx part - which isn't QUITE equivalent, having
a different pin spacing - and all was well until the leadtime went
from "in stock" to "20 weeks".

Guess what I'm doing today? Re-layout of the board so that it can
accept either module. *sigh*

 

[Dave Marsh]

Buy all you can, when you find them. Stock seems to vary a lot and the

That sounds like very good advice!

leadtimes SUCK. I speced a TSOP1238 in a product, and all was well
until suddenly the leadtime went to 8 weeks with 0 stock. Switched to
Sharp's equivalent GP1Uxxx part - which isn't QUITE equivalent, having
a different pin spacing - and all was well until the leadtime went
from "in stock" to "20 weeks".

Guess what I'm doing today? Re-layout of the board so that it can
accept either module. *sigh*

My sympathies I've recently hit this with SRAM availability, but wouldn't
have thought there would be a shortage of IR receivers. Not exactly
leading-edge technology is it?!

Dave

 

[Mike Harrison]

(tsop18xx to tsop364xx), and the

Thanks Mike. That's very interesting about the Vishay being able to receive
ok away from its nominal frequency. The transmitter is NEC protocol, so
37.9kHz. If a 36/37/38kHz receiver would work then that makes shopping
around a little easier. Does reception distance suffer?

Not noticeably.

It's a normal
consumer app so I guess 10 metres range would be totally adequate (I think
the Vishays are spec'ed at 15 metres).

Depends on how hot your emitter is...!

I searched the EBV.com stock and unfortunately they don't mention any
Vishays quite suitable for us - we need ones that will work from a 3.3V
supply and come in the small through-hole package (the large packages have a
different pinout so it's not really space that is the issue).

There are many (most) in the Vishay range that work at 3v3.

Probably still worth talking to EBV - they should be able to give you a reasonable idea of leadtime.
Also try Arrow (01279 626777).
If you need a few, email me as I may have a few TSOP34836 spare.

Just wondering out loud why there are still so many more IR receivers
stocked everywhere that need 5V supply as opposed to 3.3V?

Because most consumer devices have 5V available.

 

[Mike Harrison]

Unfortunately you won't get the Vishay part, at least, at that price.
You have to go to a couple of thousand pieces to get a price like
that.

Won't be too far off - unless they've increased very recently - You should certainly get some change
from 40p.

 

[Dave Marsh]

Not noticeably.

That's good to know. I should have checked before, but now looking properly
at the datasheet for the TSOP348xx, the responsivity will be x 0.7 or so
with a 36kHz receiver. That should be plenty, especially as the reception
distance is quoted at 35 metres, even if that should be taken with a pinch
of salt

Depends on how hot your emitter is...!


There are many (most) in the Vishay range that work at 3v3.

I did take a long look at the Vishay stock at EBV (searching for TSOP1*,
TSOP2* etc. as their database dictates) and compared each one with the specs
here:
http://www.vishay.com/ir-receiver-modules/
The only 3.3V compatible ones stocked are either surface-mount or in the
bigger package (with a different pinout to the smaller package). Unless some
of the 5V versions would actually work at 3.3V? I will try ringing EBV in
case they have other Vishays in stock that aren't listed on the website.
Thanks for the tip about EBV pricing, better over the phone.

Probably still worth talking to EBV - they should be able to give you a reasonable idea of leadtime.
Also try Arrow (01279 626777).
If you need a few, email me as I may have a few TSOP34836 spare.

Thank you Mike. I'll get back to you if I need any.

Because most consumer devices have 5V available.

Naively, we've been trying to move over to a single 3.3V digital supply for
this simple product, but it has proved impossible to do it cost-effectively
(there's a signal relay to be driven plus we found that 5V SRAM was a lot
easier to come by) so we have gone back to having 3.3V and 5V. Unfortunately
the processor taking the IR data requires a 3.3V input.

Dave

 

[Mike Harrison]

That's good to know. I should have checked before, but now looking properly
at the datasheet for the TSOP348xx, the responsivity will be x 0.7 or so
with a 36kHz receiver. That should be plenty, especially as the reception
distance is quoted at 35 metres, even if that should be taken with a pinch
of salt


I did take a long look at the Vishay stock at EBV (searching for TSOP1*,
TSOP2* etc. as their database dictates) and compared each one with the specs
here:
http://www.vishay.com/ir-receiver-modules/
The only 3.3V compatible ones stocked are either surface-mount or in the
bigger package (with a different pinout to the smaller package). Unless some
of the 5V versions would actually work at 3.3V? I will try ringing EBV in
case they have other Vishays in stock that aren't listed on the website.
Thanks for the tip about EBV pricing, better over the phone.


Thank you Mike. I'll get back to you if I need any.


Naively, we've been trying to move over to a single 3.3V digital supply for
this simple product, but it has proved impossible to do it cost-effectively
(there's a signal relay to be driven plus we found that 5V SRAM was a lot
easier to come by) so we have gone back to having 3.3V and 5V. Unfortunately
the processor taking the IR data requires a 3.3V input.

...but does that mean you need a 3v3 receiver...? you could use a 5V one and a couple of resistors...

 

[Dave Marsh]

..but does that mean you need a 3v3 receiver...? you could use a 5V one

and a couple of resistors...

Yes we could, and now might, do that. I just assumed 3.3V ones would be as
easy to get hold of as 5V ones

Dave

 

[Mike Harrison]

and a couple of resistors...

Yes we could, and now might, do that. I just assumed 3.3V ones would be as
easy to get hold of as 5V ones

I'm not sure 5V ones are any easier to get hold of.... but adding Rs as a build option can't hurt..!

 

[Dave Marsh]

I'm not sure 5V ones are any easier to get hold of.... but adding Rs as a

build option can't hurt..!

Good advice! It definitely pays to be flexible with this kind of thing