Class D mono amplifier — 18 W into 16 Ω, industrial rated
The Maxim Integrated MAX9703ETJ+T is a Class D mono audio amplifier delivering 18 W continuous into a 16 Ω load from a single supply rail spanning 10 V to 25 V. The Class D switching topology keeps quiescent losses low, so the 32-TQFN (5x5) package with exposed pad handles the thermal load without forced air in most installations. On-chip short-circuit and thermal protection, plus a mute function and shutdown input, give the system designer a clean supervisory interface. The differential inputs reject ground noise picked up over long signal runs — useful in automotive infotainment or distributed audio where the amplifier sits remote from the source.
Supply range and temperature grade
Rated for -40 °C to 85 °C ambient, the MAX9703ETJ+T suits outdoor telecom enclosures, automotive cabin audio, and industrial panel speakers.
Package and thermal management
The 32-TQFN (5x5 mm) with exposed pad demands a thermal land on the PCB — a via array under the pad to a ground plane is the standard approach.
Lifecycle and sourcing
Marked as Active by the manufacturer and ROHS3 compliant. No official second source or pin-compatible alternate is listed in the available documentation; the MAX9703ETJ+T is a Maxim-only footprint.