5pin TO-220 chip amps
I have a fascination with these simple to use amp ICs. This is a list of all that I'm aware of. Please add if you know of any more.
Single supply car audio chips (may be found in other products such as computer speakers)
TDA2003 Handles very low impedance down to 1.6 ohms.
TDA2002 Obsolete IC that was replaced by the 2003. Has lower output swing.
LM383 National's version of the popular 2003/2002
Dual supply "HiFi" ICs
UPC1238 10 watt NEC IC
TDA2006 12 watt IC
TDA2030 14 watt IC
TDA2030 18 watt / 35 watt driver IC
TDA2040 20 watt IC
TDA2050 32 watt IC. (28 watt more realistic figure)
TDA2051 data sheets show slightly improved output power over 2050. Never seen it in the wild.
LM1875 National's popular IC.
IMO, the TDA2050 and LM1875 are the must desirable 5 pin ICs available. The 2050 has the highest output swing at a given Vs while the 1875 has a higher Vs capability for more power on 8 ohm loads. I don't recommend driving them with more than +/- 18 volt supplies on 4 ohm loads. With attention to Vs limitations, they will interchange with each other. For Example, if you have a device with a blown UPC1238, you can use a 2050 in its place. The gain is the same.
Thanks for the list. I am guessing the second TDA2030 should be TDA2030A.
National LM675, marketed as a power op-amp for motor control and such, but with very similar - almost identical - specs to the LM1875 audio amp. It could be the same part with different markings.
Burr-Brown OPA544 - although distortion is quite high (~1% at 20kHz).
If you look for high power op-amps in 5 pin TO-220 packages you will find many more examples. They will generally be marketed as power op-amps, not audio amps specifically, though often they will list audio amplifier as a suggested application.
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