ln76d said:
Wwwwwhhhhhhhhhhaaaaaaaaaaaaaaaattttttt???
Exemption 40 of the RoHS Directive “Cadmium in photoresistors for analogue optocouplers applied in professional audio equipment” expired on 31 December 2013, so it can be no longer be used and there is no replacement exemption. There are no drop-in replacements available.
H11F1 series unfortunately can't be used for classic optical compression, as it's a FET: Very different native timing and working levels. Only real thing in common is the optical isolation and resistance response up to 30mVAC.
The "Macron" cell ROHS-certification was based on falsified laboratory reports. The whole story (and more) here: http://ec.europa.eu/environment/waste/weee/pdf/rohs.pdf#page=29&zoom=auto,116.25,504.5
Real amount of cadmium is not high at all, the problem lies in the definition "100ppm in mechanically separable materials" - and as Cd is a thin layer by-itself, you can scrape it off with a steady hand and a sharp tool to get >100ppm Cd.
Absolute amount of Cd is in the range of ca. 100ug per cell. Vanishing amount, was it not for the "mechanically separable" clause.
Indium antimonide (InSb) and GeCu photoconductors are said to be technically possible, but are completely absent from the market - they're probably not so good ideas anyway..
The last non-cadmium option would be Lead Selenide (PbSe) - but this is as dead as Cd according to ROHS.
Jakob E.