SA571D

Audio Special Purpose Overview

The SA571D is a dual gain control circuit manufactured by onsemi, housed in a 16-SOIC package. It integrates full-wave rectifiers, temperature-compensated variable gain cells, and operational amplifiers for each channel. The device operates within a supply voltage range of 6.0 V to 18 V and supports an ambient temperature range of -40°C to +85°C. Key electrical characteristics include a typical supply current of 4.2 mA at no signal, an output current capability of ±20 mA, and a dynamic range exceeding 110 dB.

Audio Special Purpose Feature Summary

• Dual channels configurable as dynamic range compressors or expanders
• Integrated linearized temperature-compensated variable gain cell
• Dynamic range greater than 110 dB
• Operates down to 6.0 VDC supply voltage

Audio Special Purpose Applications

• Cellular radio systems
• Radio communications systems
• Modems
• Telephone equipment
• Satellite broadcast/receive audio systems

Audio Special Purpose Procurement Notes

The SA571D is discontinued (Obsolete). Available direct replacements from onsemi include the SA571DR2G (SOIC-16) and SA571N/SA571NG (PDIP-16). Verify availability with distributors such as DigiKey or Rochester Electronics.

Audio Special Purpose Selection Notes

Select the SA571D when a compact solution for dual-channel companding is required. Ensure the application utilizes single-supply operation compatible with the 6.0 V to 18 V range. Consider external component values for R1, R2, and R3 to set desired gain ratios and DC bias levels, typically resulting in a 3.0 V output bias with internal resistors.

Audio Special Purpose Part Context

The SA571D belongs to the SA571 family of compandors originally designed for telephone multiplexing applications. It serves as an integrated alternative to complex discrete circuits, offering high performance with minimal external components. The 'D' suffix specifically denotes the 16-pin Plastic Small Outline (SO-16 WB) package variant.

Audio Special Purpose Replacement Considerations

Publicly documented substitutes include the SA571DG (Pb-Free SOIC), SA571N (PDIP-16), and SA571NG (Pb-Free PDIP). Other manufacturers offer similar compandors such as the NE570, SL5015, and KA8512, though pinouts and electrical parameters may differ.