To Faringdon:
Snip the leads close to the body of the TH resistor and blob the SMD part in the gap, use HMP solder, and the jobs a goodun' lover boy.
☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆
To the Forum:
The real issue here is that the manufacturers are going to rate their components according to any maxima that they are capable of, given the materials of construction: if nothing else it's good marketing.
The problem is that it doesn't help the designer who doesn't fully read the spec., sheets; it's a bit of a schoolboy error to assume for instance that power ratings in any particular resistors mean they are suitable for any duty provided that they meet V•I calculations.
In the conjunction that you go to the manufacturers data looking for suitability for a particular application, a temperature rise figure in free air is the nearest thing that would be of any use, and specifying maximum dissipation at an arbitrary ambient temperature may be a good quick look up, but wouldn't make good headline figures for them.
Floobydust's comments are valid, and I've sometimes shared that frustration with the 'banner ratings', though spec., sheets generally aren't BS however, the relevant information is usually down to the user to extrapolate, or they Gotcha! We've all seen burned up badly designed boards.
I will second the creation of spreadsheets for resistor ratings; something we also do for use in higher power scenarios, it's only a minor PITA.
OT:
The real problem that I have connected with this, particularly with SMD, is when the bean counters start questioning why, (for example), a design may have 10 parallel 10ohm 1W resistors when 1 single 1 ohm one will 'do'. I now refuse to repeat myself to them, but do have a previously enjoyed list of indexed design decisions on the system, and their reasons for existing. I just answer the official queries with bullet point references, (it saves typing, or even cutting and pasting as I do it from a crib sheet thats bluetacked behind my desk), also each time tell them its outside their remit to question engineering decisions: with little knowledge being a dangerous commodity.*
* anyone who has this particular time suck to deal with, can use this idea with free licence
it let's the bean counters know that you consider their existence being as pointless to you as indicators on a BMW.
Regards
Xena.