What this quad audio amp is and where it fits
The STMicroelectronics TDA7387 is a Class AB audio power amplifier in a 25-Flexiwatt through-hole package, delivering 41 W per channel into 4-ohm loads across four channels. It's built for car-radio head units and aftermarket automotive audio systems where the board sits in a ventilated chassis but sees under-dash temperatures — the -40 to 105 °C operating range covers that environment without a fan. The formed leads on the Flexiwatt package let you bolt it to a heatsink directly; the vertical mounting variant (25-Flexiwatt Vertical) is the one you'll see on most production boards.
41 W x 4 — what that rating actually means for the BOM
The 41 W per channel into 4 ohms is the max output at a stated distortion level. That's enough to drive a set of 4-ohm door speakers.
Package and mounting — what the Flexiwatt tells you
The 25-Flexiwatt (formed leads) is a through-hole power package with a metal tab for heatsink attachment. The formed leads mean the pins are pre-bent to a vertical standoff.