2W stereo Class AB with headphone driver in a through-hole DIP
The Texas Instruments TPA6021A4N is a Class AB audio power amplifier delivering 2W per channel into 4Ω loads from a 4V to 5.5V supply, with a separate stereo headphone output integrated on the same die. The 20-pin DIP package (0.300" width, 7.62mm pitch) makes it a practical choice for bench prototypes, repair swaps, and low-to-medium volume production where through-hole assembly is preferred over fine-pitch SMD. On-chip features include differential inputs, a mute function, shutdown control, thermal protection, and volume control — reducing external BOM count for basic stereo applications.
Output power and load matching
Rated at 2W x 2 into 4Ω, the TPA6021A4N is sized for driving small speakers in desktop speakers, portable radios, or intercom panels. The 4V to 5.5V supply range aligns with single 5V rails or 3.7V Li-ion battery packs. The separate headphone output lets the same amplifier serve both speaker and headphone listening without an external switch — useful for multi-media or test equipment front panels.
The through-hole DIP package handles moderate rework cycles and is compatible with socketed prototyping.