BACKGROUND:
To many this old semiconductor is "junk" but I am big on reusing or repurposing old electronic components and hardware, particularly from the point of view of sustainability.
Sustainability far more than NOT burying waste material back into the earth but consciously recognising the energy expended to create the item through it's various "stages" in life, beginning with the raw materials being extracted from the earth, processed, finished and then fitted into equipment - every single step used energy which is referred to as embodied energy.
To give an approximate representation of how much energy was used in the WHOLE production process of an item, I have created what I refer to as the Ee (Embodied Energy) value, measured in Mj
The Ee value is an approximation only and usually measured in Mj.
Coming up with an Ee value is an attempt to take into account the energy used for extracting and processing of the raw materials, manufacturing of the component, distribution of the component(s) and final assembly of the component. In fact the measurement of Ee can become extremely complicated and technical, many tertiary institutions are involved in this specialised field of science.
I have used various reliable sources online to arrive at approximate Ee values, these are approximations and the sole purpose is to raise awareness of the extraordinary energy consumed in the creation of various electronic components and hardware - it may give you cause to think twice before wasting all that energy and burying it in the ground, with the possible side-effects of poisoning the environment due to leeching.
HERE is a page I have created which gives some tables and more detailed information about specific Ee values for different materials plus a link which you can use as a starting point to investigate Ee for yourself.
This old and difficult to source (at a reasonable price) transistor was extracted from the JVC BR-6400TR Professional VCR machine which has recently been on the "operating table"
TOSHIBA - Power Transistor
Type: 2SD845
NPN
Vcb 150V
Vce 150V
Pc 120W
Ic 12A
hFE minimum 55
COSMETIC CONDITION:
USED
Clean
Leads desoldered relatively cleanly
TESTING:
Basic testing indicates the device is fully functional
hFE reads 55
As each device is tested, the hFE result has been written onto the rear heatsink area
Lead lengths 21mm and are reasonably clean, non-oxidised - perfectly solderable
This transistor has now been packed in a sealed clear plastic packet awaiting a new purpose in life!
