I can obtain the IRFZ44 for A$3.00 (possibly less in quantity) whereas the IRFP044 is $7.85 in small quantities.
The IRFZ44 seems to be pretty much the same device in a better package TO-247 instead of TO220.
Key spec.s are as follows:
IRFP044 / IRFZ44
VDSS = 60V (same)
RDS(on) = 0.28 (same)
ID = 57 / 50A
Power Dis. 180 / 150W
Thermal Res. - Case to Sink: 0.24 / 0.5 C/W
gfs: 17 / 15S
td(on): 19 / 14ns
td(off): 55 / 45ns
Ciss: 2500 / 1900pF
Any views on this and are there any other critical specifications to consider?
Nix
The IRFZ44 seems to be pretty much the same device in a better package TO-247 instead of TO220.
Key spec.s are as follows:
IRFP044 / IRFZ44
VDSS = 60V (same)
RDS(on) = 0.28 (same)
ID = 57 / 50A
Power Dis. 180 / 150W
Thermal Res. - Case to Sink: 0.24 / 0.5 C/W
gfs: 17 / 15S
td(on): 19 / 14ns
td(off): 55 / 45ns
Ciss: 2500 / 1900pF
Any views on this and are there any other critical specifications to consider?
Nix
Use the IRFP044's... You'll probably find it works out cheaper to import these devices from arrow or digikey in america.
Minor correction to above
"The IRFZ44 seems to be pretty much the same device in a better package TO-247 instead of TO220."
should read:
"The IRFZ44 seems to be pretty much the same device except that the IRFP044 has a better package (TO-247) and hence higher power rating than the IRFZ44 (TO220 package). OTOH the IRFZ44 is slightly faster."
I appreciate the advice above - but can anyone tell me why the IRFP044 is preferred (given the power of either is ample) - what other specs are important when choosing a MOSFET?
Nix
"The IRFZ44 seems to be pretty much the same device in a better package TO-247 instead of TO220."
should read:
"The IRFZ44 seems to be pretty much the same device except that the IRFP044 has a better package (TO-247) and hence higher power rating than the IRFZ44 (TO220 package). OTOH the IRFZ44 is slightly faster."
I appreciate the advice above - but can anyone tell me why the IRFP044 is preferred (given the power of either is ample) - what other specs are important when choosing a MOSFET?
Nix
VDSS = 60V .... rail to rail voltage should be less than this
RDS(on) = 0.28 (same) .... meaningless when building analogue amplifiers
ID = 57 / 50A .... high is better
Power Dis. 180 / 150W .... this is a function of die size and hence also Ciss as well as package type .... for a given power rating for the amp output stage we try to minimize total culmative Ciss
Thermal Res. - Case to Sink: 0.24 / 0.5 C/W .... you'll be able to run the bias high with the 044's for a given Junction temp
gfs: 17 / 15S .... higher transconductance is preferred
td(on): 19 / 14ns .... Assuming we set the XA to 50% and operate it below cutoff which is what we normally do then the mosfets dont turn on or off at any time during the waveform.
td(off): 55 / 45ns .... same as for td(on)
Ciss: 2500 / 1900pF .... determines the number of devices that can be placed in parallelled for a given high frequency rolloff.
Hope all that helps.
RDS(on) = 0.28 (same) .... meaningless when building analogue amplifiers
ID = 57 / 50A .... high is better
Power Dis. 180 / 150W .... this is a function of die size and hence also Ciss as well as package type .... for a given power rating for the amp output stage we try to minimize total culmative Ciss
Thermal Res. - Case to Sink: 0.24 / 0.5 C/W .... you'll be able to run the bias high with the 044's for a given Junction temp
gfs: 17 / 15S .... higher transconductance is preferred
td(on): 19 / 14ns .... Assuming we set the XA to 50% and operate it below cutoff which is what we normally do then the mosfets dont turn on or off at any time during the waveform.
td(off): 55 / 45ns .... same as for td(on)
Ciss: 2500 / 1900pF .... determines the number of devices that can be placed in parallelled for a given high frequency rolloff.
Hope all that helps.
AudioFreak
Thanks for the detailed reply - I understand all your points.
What other specs are important?
I also emailed you re your matched IRFP240 sale.
Nic
Thanks for the detailed reply - I understand all your points.
What other specs are important?
I also emailed you re your matched IRFP240 sale.
Nic
I haven't tried the Z44, so I couldn't say, but the
higher transcondctance and current rating is going to
make for a slightly different sound. Like the IRF150 or
250, it will probably tend to have better performance
on the bottom, but may be a bit darker on the top.
You might like this better, maybe not. Try it.
higher transcondctance and current rating is going to
make for a slightly different sound. Like the IRF150 or
250, it will probably tend to have better performance
on the bottom, but may be a bit darker on the top.
You might like this better, maybe not. Try it.
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