BD3861FS-E2 - 2-Channel Audio Signal Processor | ROHM
N.º de pieza: BD3861FS-E2 ⚠ Última compraBD3861FS-E2 Descripción general
An audio sound processor is an analog integrated circuit that conditions multiple audio channels and provides programmable control functions in equipment such as mini-component stereo systems, boom boxes, compact audio products, and other consumer electronics. Within the broader signal-chain hierarchy, it belongs to the sound-processor IC family, works alongside audio amplifiers and source-selection circuits, and provides a centralized control interface between the system controller and analog audio paths.
The BD3861FS-E2 emphasizes signal-to-noise performance through a two-stage implementation of front-volume and rear-volume control. Its resistance-ladder volume and tone implementation is intended to provide low noise and low distortion, while the built-in three-band equalizer supports bass, midrange, and treble adjustment. The 2-wire serial interface reduces control-pin count compared with a parallel-control architecture and simplifies connection to a host controller.
ROHM identifies the device as a BiCOMS audio processor. The BD3861FS-E2 is specified for a 6.5 V to 9.5 V supply, an operating temperature range of -25 °C to +75 °C, and a 32-SSOP-A surface-mount package approximately 5.4 mm wide. The 32-pin package provides separate signal and control connections for a two-channel processor, although the complete pin map must be taken from the manufacturer datasheet before PCB routing or replacement.
Typical applications include compact stereo systems, boom boxes, mini-component audio equipment, portable audio products, and other two-channel products that require electronic volume and three-band tone control. The serial control interface is particularly useful where a system controller must adjust sound settings while keeping the front-panel wiring compact. In multi-source products, source-selection control can be coordinated with the processor rather than implemented entirely through a separate relay-based network.
Designers should confirm the serial protocol, command map, reset requirements, and control timing in the manufacturer datasheet. The audio path should be evaluated for gain structure, clipping, channel separation, and pop-noise behavior across the full input range. PCB layout should keep audio traces short, maintain a continuous ground reference, and isolate control signals from sensitive audio nodes to reduce coupling.
This product page organizes the confirmed operating information, lifecycle status, package details, family context, application guidance, and engineering trade-offs into one focused reference for evaluating the BD3861FS-E2 in new or existing stereo audio designs.
Alternativas directas para BD3861FS-E2 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con BD3861FS-E2 (mismo factor de forma y huella) — difiere en Control Interface, Lifecycle Status, Product Type.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasBD3861FS-E2 Valores máximos y características eléctricas
| Product Type | Sound processor with built-in three-band equalizer |
| Audio Channel Count | 2 channels |
| Supply Voltage Range | 6.5 V to 9.5 V |
| Control Interface | 2-wire serial control |
| Equalizer Bands | 3 bands: bass, mid, and treble |
| Process Technology | BiCOMS process |
| Rango de temperatura de funcionamiento | -25 °C to +75 °C |
| Package Type | 32-SSOP-A surface-mount package |
| Package Width | 5.4 mm |
| Recuento de pines | 32 pins |
| Tipo de montaje | Surface mount |
| Volume Control Architecture | Resistance-ladder circuit with two-stage front and rear volume configuration |
| Tone Control Architecture | Resistance-ladder circuit |
| Estado RoHS | Compliant |
| Estado del ciclo de vida | Last Time Buy; product discontinuation announced |
Guía de configuración de pines de BD3861FS-E2 5.4 mm
Configuración de pines para BD3861FS-E2 (encapsulado 5.4 mm). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para BD3861FS-E2.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
BD3861FS-E2 es adecuado para 6 aplicacións: Mini-Component Stereo Systems, Boom-Box Audio Products, Portable Stereo Audio, Compact Radio and Media Player, Two-Channel Active Speaker, Home Audio Control Module.
Mini-Component Stereo Systems
The BD3861FS-E2 fits compact stereo products that need centralized volume, tone, and source-control functions for two channels. Its 6.5 V to 9.5 V operating range suits conventional low-voltage analog audio systems, while the 2-wire serial interface reduces control wiring between the sound processor and a host controller. The built-in three-band equalizer supports bass, midrange, and treble adjustment without requiring a separate passive tone network. During design, verify input and output levels, the serial command map, and the external-component values specified in the ROHM datasheet.
Recomendado
Boom-Box Audio Products
The BD3861FS-E2 is appropriate for portable or compact boom-box architectures requiring two-channel electronic volume control and tone adjustment. Its two-stage front-volume and rear-volume arrangement is designed to support high signal-to-noise performance, while the resistance-ladder volume and tone implementation targets low noise and low distortion. A system controller can use the 2-wire interface to change sound settings and source states. Engineers should prototype the complete signal path and check switching noise, channel balance, clipping margin, and behavior across the 6.5 V to 9.5 V supply range.
Recomendado
Portable Stereo Audio
A portable stereo product can use the BD3861FS-E2 when user-adjustable volume and three-band tone are needed close to the audio front end. The 2-wire serial control reduces the number of host-controller connections, while the two-channel architecture aligns with common left and right signal paths. The BiCOMS implementation and resistance-ladder control are intended to support low-noise, low-distortion operation. Layout work should keep audio routing compact, preserve a low-impedance ground plane, isolate the serial control trace, and confirm the external capacitor and resistor recommendations in the manufacturer documentation.
Recomendado
Compact Radio and Media Player
The BD3861FS-E2 can provide the shared volume and equalization stage in compact radio, cassette, CD, or media-player products. A host microcontroller can send commands over the 2-wire serial interface, allowing multiple internal sources to be presented through a controlled stereo output stage. The three-band equalizer provides basic bass, mid, and treble adjustment, and the resistance-ladder tone implementation is designed to limit distortion. Integration engineers should confirm source-selection behavior, signal levels, control polarity, and reset requirements directly from the manufacturer datasheet.
Recomendado
Two-Channel Active Speaker
An active-speaker controller can place the BD3861FS-E2 in the analog signal path to provide adjustable level and three-band tone before power amplification. Its two-channel organization supports symmetric left and right processing, and the low-voltage supply range is compatible with many portable audio power stages. The serial control interface allows volume and equalizer settings to be managed by a main controller rather than multiple mechanical potentiometers. Signal-chain validation should include amplifier input impedance, ground reference, crossover behavior, channel matching, and maximum operating level.
Recomendado
Home Audio Control Module
The BD3861FS-E2 is suitable for a dedicated analog audio-control module in a home stereo or compact entertainment system. Placing the processor ahead of the output amplifier allows source selection, electronic volume, and three-band equalization to be coordinated in one block. The 2-wire control interface is useful for space-constrained boards and reduces parallel-control routing. Designers should use the datasheet pin and application information to establish grounding, external timing components, and signal levels, then verify pop noise and distortion during volume transitions.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para BD3861FS-E2 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Brand | ROHM Semiconductor |
| Package | 32-SSOP-A |
| Audio Channels | 2 channels |
| Supply Voltage Range | 6.5 V to 9.5 V |
| Control Interface | 2-wire serial control |
| Equalizer | Built-in 3-band equalizer |
| Process Technology | BiCOMS process |
| Operating Temperature | -25 °C to +75 °C |
| Lifecycle Status | Last Time Buy; discontinuation announced |
Diferenciadores clave
- Integrated three-band sound control (frente a BD3883FS)
- Two-stage front and rear volume architecture (frente a BD3403FV)
- Compact two-wire host-control interface (frente a A parallel-control architecture)
Notas de diseño
Place the BD3861FS-E2 close to the audio-source switching and output-amplifier stages to minimize sensitive analog trace length. Maintain a continuous ground reference beneath and around the device, use the shortest practical connections for audio paths, and route the 2-wire serial signals away from high-impedance audio nodes. Follow the manufacturer application diagram for external resistance and capacitance values rather than substituting values from unrelated audio processors.
Evaluate the complete two-channel path for clipping, gain staging, channel matching, and switching transients. The resistance-ladder volume and tone architecture is intended to provide low noise and low distortion, but actual performance also depends on source impedance, load impedance, external component selection, and grounding. Measure noise and distortion at multiple volume settings because the operating point can change the contribution of each stage.
Design the 6.5 V to 9.5 V supply rail with adequate transient margin and local decoupling at the device. Confirm the pin assignments and recommended capacitor values in the ROHM datasheet before layout because storage, solder, and output impedance can create additional transients. Check both the minimum and maximum operating-supply conditions, including startup behavior and system power-down sequences, before approving the board.
Do not treat BD3861FS and BD3861FS-E2 as interchangeable solely from their similar names. Confirm the manufacturer ordering table, tape-and-reel orientation, package marking, and operating limits. The family has also been announced for discontinuation, so a cross-design substitution must address lifecycle availability as well as pinout, serial protocol, equalizer functions, and audio-level compatibility.
Información de cumplimiento
RoHS compliance is identified for the BD3861FS family in the cross-reference information. No automotive qualification or additional environmental-compliance claim is established.
