Osram Oslon Square Flat CSLPM2.PC

Flashlight Modding and DIY Parts
1

Osram has a new interesting emitter in their product range, the Osram Oslon Square Flat CSLPM2.PC.

Datasheet is also available (click starting download, 0.8 MB, pdf)

  • in general a dedomed 2nd gen Oslon Square CSSRM1.PC
  • emitter height only 0.76 mm (XP-L HI: 1.00 mm)
  • Standard Osram footprint, 3.00 x 3.00 mm like Black Flat and normal Square
  • features electrically isolated thermal pad, typical 3.0 K/W
  • LES size not stated in datasheet, I got 1.45 x 1.45 mm (= 2.10 mm²) via counting pixels in datasheet package outline
  • Based on this, the luminance maybe reach 140 to 170 cd/mm² so I could be usable for thrower
  • The radiation characteristics reminds of Black Flat so there should be no significant side emitted light

2

2.63 mm² thermal pad.

3

Thanks for the info. Interesting.

Some things I noticed:

  • There is phosphor around the die => might lead to yellow-green corona
  • It has two bond wires
  • Only rated for 135°C junction temp (very unusual, standard is 150°C)
  • Thermal resistance: 3°C/W (nothing special)
  • Available in 5700K in addition to 6500K
  • Very low Vf
  • Die area: looks like 2.25mm^2 (large!)
  • They “forgot” to state the luminance
4

In the first page of datasheet Osram stated 'The flat package shape enhances color homogenity due to reduced color over angle variation'. It seems to me that the LED chip does not emit any light to the side (at least the CSSRM1 doesn't have this problem because of classic lateral chip). The new gen Cree LEDs does this and this is one of the reasons why they produce weird beam patterns.

5

They write that because it doesn’t have a dome. So in that sense it’s true (as can be seen when comparing the XP-L HI to the HD).

The phosphor on the outside might still have an effect though. They do write that not having a dome “guarantees” a consistent tint…

6

I measured in the solder pad section the size where its stated for Component location on Pad
I get 1.9mm² for die size there

2.25mm² seems the picture of the LED in datasheet

7

8

Finally osram…

9

The Square and SSL’s always had the isolated thermal pad. The Black does not have it

10

Thanks djozz , i only knew about the uv leds and black flat . :+1:

11

There is also a KW CSLPM2.CC variant with 3000-4000K and 90CRI.

Doesn't the name show that it's a 3rd Gen Square?

12

But only if the die emits light sideways or light is strongly reflected in the silicone layer (rather unlikely). I just tested, the CSSRM2 has also phosphor around the die but because of the chip which emits no light sideways this has no impact of the color over angle and therefore no effect on the beam pattern if used with secondary optics.

Names are inm general meaningless, but in the meantime I tend also to think that the CSLPM2 is in fact a dedomed CSSRM2 because the die / bonding design only applies to CSSRM2, not 1.