BD3850FS-E2

Audio Special Purpose Overview

The BD3850FS-E2 is a sound processor IC manufactured by ROHM Semiconductor, featuring a built-in 4-band equalizer (Bass, Middle, Treble, and Loudness). It is designed for high-performance audio applications with low current consumption achieved through BiCMOS process technology. The device supports independent input selection and volume control, making it suitable for complex audio systems.

Audio Special Purpose Feature Summary

• Built-in 4-band Equalizer: Bass, Middle, Treble, and Loudness controls
• Low Current Consumption: Typical Iq of 16mA (at Vcc=9V)
• Flexible Input Configuration: Supports up to 5 stereo inputs with independent or cascade selection
• High Performance: THD+N typically 0.001%, Output Voltage typ. 2.2V
• Surround Function: Can be constructed without external components
• Package: SSOP-A32 (32-pin Shrink Small Outline Package)

Audio Special Purpose Applications

• High-end car audio systems
• Home theater amplifiers
• Professional audio mixing consoles
• Multi-zone audio distribution systems

Audio Special Purpose Procurement Notes

Verify the specific suffix '-E2' which indicates RoHS compliance and tape & reel packaging. Check the lifecycle status on the official ROHM website, as older variants may be End-of-Life (EOL) or Not Recommended for New Designs (NRND). Minimum order quantity is typically 2000 units in tape & reel.

Audio Special Purpose Selection Notes

Select the BD3850FS-E2 when a 4-band parametric equalizer is required alongside input switching and volume control. Compare against the BD375xx series if fewer bands are needed. Ensure the supply voltage range (typically 7V to 9.5V) matches the system design. Note that while some ROHM audio parts are automotive-grade, standard commercial versions should be verified for AEC-Q100 qualification if used in vehicles.

Audio Special Purpose Part Context

The BD3850FS is part of ROHM's dedicated sound processor family, often used in conjunction with power amplifiers. It differs from simpler tone-control chips like the BD387x series by offering more extensive EQ capabilities (4 bands vs 2-3 bands) and higher channel counts.

Audio Special Purpose Replacement Considerations

Direct pin-to-pin replacements within the same package (SSOP-A32) include the BD37543FS or BD37544FS, though feature sets (EQ bands, input count) may vary. Always consult the latest ROHM datasheets for functional compatibility before substituting.