AS1701-T

Overview

The AS1701-T is a 1.6W bridged audio power amplifier from ams-OSRAM USA INC., housed in an 8-pin MSOP package with tape and reel delivery. It operates on a single 2.7V to 5.5V supply, delivering 1.6W into 4Ω or 0.8W into 8Ω at 1% THD+N under 5V conditions. Quiescent current is typically 10.4mA at 5V, dropping to 1µA in shutdown. The device features over-temperature and over-current protection, click-and-pop suppression, and high PSRR exceeding 65dB at 217Hz.

Feature Summary

• Bridge-tied load (BTL) architecture eliminates the need for output coupling capacitors
• Integrated thermal overload and short-circuit protection circuitry
• Low-power shutdown mode reduces quiescent current consumption significantly
• Click-and-pop suppression circuitry minimizes audible transients during power cycles

Applications

• Audio front-ends for MP3 and CD players
• Mobile phones and PDAs
• Portable DVD players
• Hand-held battery-powered devices

Procurement Notes

Verify the active-high shutdown logic specific to the AS1701 variant when designing the control interface. Confirm the 8-pin MSOP package dimensions match the PCB footprint requirements. Ensure the supply voltage remains within the 2.7V to 5.5V range to maintain specified performance levels. Check for RoHS compliance documentation if required by the manufacturing process.

Selection Notes

Select this component for applications requiring a cost-effective, single-supply audio solution without external output capacitors. Consider the 8-pin MSOP package size for space-constrained designs. Evaluate the thermal dissipation capabilities if operating near maximum power limits. Verify that the gain-setting resistor network aligns with the desired input signal levels and system impedance.

Part Context

The AS1701-T belongs to the AS1701/AS1706 family of 1.6W audio power amplifiers manufactured by ams-OSRAM. It shares core specifications with the AS1706 but differs in shutdown pin polarity, with the AS1701 utilizing an active-high shutdown configuration. Both variants are designed for portable electronics and offer similar electrical characteristics and protection features.

Replacement Considerations

The AS1706 serves as a functional substitute with identical electrical performance, differing only in the shutdown pin logic being active-low instead of active-high. Designers must adjust the control circuitry accordingly when swapping between these two part numbers.