Power stage and channel flexibility
The TAS5756MDCA is a PurePath™ Class D amplifier from Texas Instruments delivering 56 W into a 4 Ω load in mono (BTL) configuration or 28 W per channel into 4 Ω in stereo (SE) mode — one device covers both a single subwoofer channel and a full-range stereo pair by reconfiguring the output stage. Supply range is 2.9 V to 3.63 V, typical for a digital-input Class D amp running from a 3.3 V system rail; the integrated short-circuit protection latches off the output on a hard fault, so the downstream speaker and PCB traces see a controlled shutdown rather than continuous DC.
Package and thermal interface
Supplied in a 48-lead HTSSOP with an exposed thermal pad — the same footprint as the 48-TFSOP but the pad is the primary heat path. The pad must be soldered to a copper plane on the PCB; without it the 56 W output into 4 Ω drives the junction above the 85 °C ambient ceiling within seconds. Surface-mount only. The tube packaging is typical for prototype and low-volume builds; reel options exist for production but the order code specifies tube. Confirm the tube quantity against your line requirement before committing the BOM.
Lifecycle and compliance status
The ROHS3 declaration covers the full substance restriction list (lead, mercury, cadmium, hexavalent chromium, PBBs, PBDEs, plus the four phthalates).