- This topic has 2 replies, 3 voices, and was last updated 9 months, 2 weeks ago by Karl Gerhardt.
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June 13, 2023 at 2:25 pm #1725victorhooiParticipant
Hi,
Firstly,
I saw from the BOM, that apparently the LED is the following Digikey part number:
1537-1183-1-ND
I looked that up on the Digikey website, and it says that part (OSRAM LZ7-04M100) is actually EOLed and no longer sold:
Has this part been replaced with something else in current Chi.Bio units?
I checked Mouser (https://au.mouser.com/ProductDetail/ams-OSRAM/LZ7-04M100?qs=Fmc9sZFav4aLTTVg7wmsEQ%3D%3D), and they suggested the following replacement part (Osram LZ7-04M2PD-0000):
https://au.mouser.com/ProductDetail/?qs=hWgE7mdIu5SA%2FUCo8SZarw%3D%3D
I briefly skimmed the datasheet for that part:
https://dammedia.osram.info/media/resource/hires/osram-dam-14744640/LZ7-04M2PD_EN.pdf
and it seems to be 60W versus 20W, but the same physical footprint.
Would that be a good replacement?
Thanks,
VictorJune 25, 2023 at 1:58 pm #1729harrisonKeymasterHello Victor,
The original LZ7 LED is STILL used in the devices since the producer (Labmaker) bought a large stockpile of them when they saw it was going to be discontinued.
There are various alternate LEDs, such as the one you posted. However, at least in my opinion they are not as good as the original part we used. For example, in the case of the one you listed it has much wider PCLime and PCAmber filters which don’t give a nice “tight” excitation wavelength distribution, as is necessary to get good signal-to-noise for fluroescence measurements.Depending oon your application you might be OK with this. In that case this WOULD be possible to swap into the device, though you need to check the pin-out on that LED is exactly same as the original LZ7 if it is to just be directly soldered onto the PCB.
February 1, 2024 at 10:00 pm #1781Karl GerhardtParticipantLZ7-04M2PD appears to be the closest thing to a substitute (please share if there are others) but does not have a compatible pin-out (see below). It might be possible to control some of the LEDs and insulate the pins with incorrect polarity. Ideally though, the component would be substituted with a different LED.
Harrison- have you given any more thought to hosting the project files?
LZ7-04M100:
Pin Color Polarity
2 Red +
3 Green +
5 Blue +
6 Amber –
8 White +
9 Cyan –
11 Violet +
14 Violet –
15 Cyan +
17 White –
20 Amber +
21 Blue –
23 Green –
24 Red –LZ7-04M2PD:
Pin Color Polarity
2 Red +
3 Blue +
5 Green +
6 Lime +
8 Lime +
9 Amber +
11 Cyan –
14 Cyan +
15 Amber –
17 Lime –
20 Lime –
21 Green –
23 Blue –
24 Red – -
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