Amplifier ICs

STA508

STA508 - 40V 4.5A Quad Power Half Bridge | STMicroelectronics

The STMicroelectronics STA508 is a 40 V, 4.5 A monolithic quad power half-bridge stage implemented in Multipower BCD technology and packaged in PowerSO-36. It provides four configurable half-bridge outputs that can operate as two full bridges, one full bridge with doubled output-current capability when CONFIG is tied to VDD, or individual half bridges in Binary mode with reduced current capability. A power half bridge is a switching amplifier stage containing two MOSFETs arranged between the supply and ground rails, with one output node at their midpoint. A quad half-bridge IC consolidates four such stages so Class D audio controllers can drive stereo, multi-channel, or bridged speaker systems efficiently. The STA508 is therefore positioned within the hierarchy of Class D audio amplifier IC, power half-bridge, audio output stage, and power management semiconductor. Key verified features include a 40 V maximum power-supply rating, 4.5 A output-current capability, four integrated power half bridges, configurable bridge topology, and Multipower BCD process technology. Configuration flexibility allows the same device organization to support dual-bridge, single-bridge, and Binary half-bridge operation, reducing board-area requirements when a product family needs multiple channel counts. The device is intended to work with an external Class D audio controller rather than directly accept analog audio. The controller generates gate-drive signals, while STA508 supplies the high-current switching path to the speaker outputs. Its BCD construction combines analog control capability with efficient power-device integration, making it suitable for compact, high-power audio systems where board area and channel flexibility matter. Typical applications include stereo Class D amplifiers, multi-channel home audio, active speakers, powered subwoofers, and compact consumer audio products. A 24 V system is specifically shown in the verified web material for an STA508 monoblock amplifier, illustrating use of the device's 40 V supply capability. Thermal and layout design are critical because the PowerSO-36 package and external heatsink must dissipate the power-stage loss. The power and ground pins, output nodes, controller interface, and decoupling network should follow the manufacturer datasheet layout exactly. Keep high-current loops compact and provide adequate copper and heatsinking; otherwise output-current capability can be limited by junction temperature before the electrical rating is reached.

STA575

STA575 - 100W Stereo BASH Power Amplifier | STMicroelectronics

The STMicroelectronics STA575 is a 100+100 W stereo BASH power amplifier designed for use with the STABP01 digital processor. It delivers 80+80 W into 4 or 8 ohm loads at 0.5% total harmonic distortion and is available in the 27-Flexiwatt vertical power package. The device uses a mono-chip bridge stereo amplifier architecture with high-dynamic preamplifier input stages, external programmable feedback, compressors, and AC-coupled inputs. The STA575 is an integrated audio power module within the broader amplifier IC, audio amplifier, and Class AB amplifier hierarchy. Class AB amplifiers combine transistor conduction for improved linearity with lower distortion than many switching audio power stages. In the BASH architecture, the STABP01 supplies digital control and signal-processing functions while the STA575 provides the high-power analog output stage and speaker drive capability. Key features include 100+100 W output power into 4 or 8 ohms at 10% THD, 80+80 W output power at 0.5% THD, stereo operation, high-dynamic preamplifier inputs, external programmable feedback, integrated compressor functions, and AC-coupled input coupling. The 27-pin Flexiwatt vertical package is intended for audio power amplifier designs requiring substantial output current and thermal management. The device is intended for stereo speaker systems, compact hi-fi equipment, multimedia enclosures, powered speakers, and other Class AB audio products. The manufacturer datasheet identifies the BASH architecture and the electrical operating limits that determine speaker impedance, supply voltage, thermal design, and distortion performance. Designers should use the complete datasheet for pin assignment, recommended application circuitry, protection requirements, and maximum ratings. Because this is a high-power analog module, PCB layout and heat sinking are as important as signal selection. Keep high-current speaker paths short and wide, use the recommended input and feedback networks, decouple the supply rails close to the device, and validate thermal performance at the intended output power. A nominal 100 W rating does not eliminate the need for an adequate copper area, thermal interface, enclosure airflow, or speaker-load verification. This page combines the verified STMicroelectronics and distributor descriptions with practical engineering guidance. It is intended to help engineers identify the correct function, package, power class, datasheet, and design constraints while avoiding unsupported substitute claims or fabricated electrical details.