Small high temp red led?

[Don Klipstein]

I need a small (pref. 0603, max. 0805) red led.
(used as a voltage ref in a dense small circuit).

The tough part is the max working temp: 125°C

Any part number?

LXK2-PD12-*00 (where * is Q, R or S).

This is a slightly orangish red high brightness LED lamp by Lumileds
with maximum chip temperature 150 degrees C and characterizing current 350
mA.

The dominant wavelength (a color specification that largely but not
always exactly means "hue") is in the 620's of nm typically. The typical
peak wavelength is in the 630's of nm.

The main distributor is Future Electronics.

Sensitivity of photometric performance to temperature is something that
I consider significant.

Link to the datasheet:

http://www.lumileds.com/pdfs/DS51.pdf

Link to its manufacturer's homepage:

http://www.lumileds.com

- Don Klipstein ([email protected])

 

[Don Klipstein]

Isn't that close to the typical max junction temp for any
semiconductor?

Heck, I have seen quite a bit of plastic/epoxy-molded silicon
semiconductors rated for max Tj of 150 C, and a fair number of metal
package silicon bipolar devices rated for Tj(max) of 200 degrees C.

As for LEDs: I have over a large majority of the past 30 years noticed
that LEDs tended to do well at achieving the widely-mentioned 100,000
operating-hours life expectancy only when junction temperature is
"largely" limited to 85 degrees C. High temperature tolerance has
increased, mainly starting in the mid 1990's.
I advise to consult datasheets for specific part numbers or relevant
product lines (and down to specific color).

- Don Klipstein ([email protected])

 

[Don Klipstein]

Mook Johnson a écrit :

Yep, I only need it to survive but with unaltered electrical parameters.
That's for some industrial sensors (hence the temp range) and can be
deeply buried into huge machines and can only be accessed at the
occasion of a 5 year maintenance operation.
Some of those sensors can operate 24h a day at high temp.
'Programmed failure' isn't an option.

When an LED is "getting cooked", according to my experience it fails
optically more before electrically.

- Don Klipstein ([email protected])