BD3402KS2 - 2-Channel Audio Signal Processor | ROHM Semiconductor
MPN： BD3402KS2 ✗ 停產BD3402KS2 概覽
An audio sound processor is an analog integrated circuit that conditions two audio channels and adds functions such as surround and bass boost. It belongs to the broader audio-processing hierarchy of sound processors, audio amplifiers, interface ICs, and power-management semiconductors. In cassette equipment, the built-in preamplifier reduces the external circuitry required around the recording and playback signal path.
The BD3402KS2 supports two audio channels from one 8 V to 9.5 V supply. Its 2-wire interface allows a control system to select or configure supported operating functions. According to the ROHM product information, the associated processor family provides surround and bass-boost functions with soft switching intended to reduce shock noise during mode changes. A dedicated digital-circuit power-supply terminal helps maintain internal IC state with low standby current.
The device integrates multiple analog audio functions in one package. Its preamplifier is designed for cassette recording and playback, while the surround and bass-boost sections support consumer-audio signal shaping. Soft switching is an important implementation feature because abrupt mode transitions in audio systems can create an audible transient. The two-channel architecture also allows coordinated processing of left and right program material.
Typical uses include cassette-deck record and playback circuitry, compact home-audio systems, analog stereo equipment, and legacy consumer-audio designs requiring a dedicated audio signal processor. The 12 mm by 12 mm SQFP-T package requires a multilayer PCB with fine-pitch routing and careful thermal management, so the availability of exact schematic, footprint, and pin-assignment data is critical before a replacement is approved.
Design work should verify the complete pinout, recommended application circuit, external resistor and capacitor values, control timing, and thermal requirements against the manufacturer datasheet. Because the BD3402KS2 is identified as obsolete in the supplied product data, engineers should also confirm whether new production is possible and whether an authorized manufacturer-supported alternative exists for the original design.
This page consolidates the verified manufacturer and distributor information, exposes missing datasheet-dependent values rather than estimating them, and organizes sourcing, application, and design guidance for engineers evaluating the BD3402KS2.
直接替換替代品，適用於 BD3402KS2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： BD3402KS2 （相同外形與佔位） — 差異在於 Package, Product Type.
此產品無可直接替換的替代品。
申請替代品BD3402KS2 最大額定值與電氣特性
| Product Type | 2-channel analog audio signal processor |
| Primary Application | Home-audio cassette recording and playback |
| Number of Channels | 2 channels |
| Supply Voltage Range | 8 V to 9.5 V |
| Power Supply Type | Single power supply |
| Built-In Preamplifier | Yes, for cassette recording and playback |
| Control Interface | 2-wire interface |
| Internal Circuit Count | 1 circuit |
| Audio Functions | Surround and bass boost |
| Mode Switching | Soft switching to reduce shock noise |
| Digital-Circuit Supply | Dedicated power-supply terminal for internal-state maintenance |
| 封裝 | 64-SQFP-T, 12 mm x 12 mm |
| Terminal Count | 64 terminals |
| 安裝類型 | Surface mount |
| RoHS 狀態 | Compliant |
| 生命週期狀態 | Obsolete |
BD3402KS2 64-sqfp-t, 12 mm x 12 mm 腳位配置指南
BD3402KS2（64-sqfp-t, 12 mm x 12 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： BD3402KS2.
請參閱 資料表 以查看完整腳位配置。
典型應用
BD3402KS2 適用於 6 應用s: Cassette Deck Recording Preamplifier, Cassette Playback Signal Processing, Home Stereo Audio Processing, Legacy Audio Equipment Repair, Analog Stereo Sound-Shaping Stage, Two-Channel Audio Control Interface.
Cassette Deck Recording Preamplifier
The BD3402KS2 fits cassette-deck recording circuitry because its built-in preamplifier is specifically intended for tape recording and playback, reducing the number of external signal-conditioning components. Its 2-channel architecture supports coordinated left and right recording paths from one 8 V to 9.5 V single supply. This is particularly useful when repairing an existing home-audio deck whose schematic already expects the device's integrated preamplifier and two-wire control arrangement. Designers must still reproduce the manufacturer's exact gain-setting network, filtering, and input connections from the original application diagram because those values were not present in the supplied excerpts.
推薦
Cassette Playback Signal Processing
The BD3402KS2 can condition two channels in a cassette playback signal path while adding surround, bass-boost, and soft-switching functions associated with the documented processor family. Soft switching is useful during mode changes because it is intended to reduce shock noise in the loudspeaker output. The part's 8 V to 9.5 V operating range fits legacy equipment built around a nominal 9 V rail. A replacement or repair should preserve the original filter, mode-control timing, and output-loading arrangement rather than treating the processor as a generic stereo amplifier.
推薦
Home Stereo Audio Processing
The BD3402KS2 suits legacy home-stereo products in which left and right audio channels require integrated bass boost, surround enhancement, and soft mode switching. Its 2-wire interface can support compact system control, while the single 8 V to 9.5 V supply simplifies integration into equipment designed around legacy cassette and analog-audio rails. The 64-SQFP-T package saves board area compared with discrete networks but requires fine-pitch layout and careful return-path planning. For new home-audio platforms, current codec or amplifier solutions may be preferable because of documentation and lifecycle support.
推薦
Legacy Audio Equipment Repair
The BD3402KS2 is most valuable as a targeted repair component for legacy home-audio equipment that already uses its integrated cassette preamplifier and surround or bass-boost functions. Because the part is identified as obsolete, engineers can use the existing board artwork as a constraint when identifying availability: the required device is a 64-SQFP-T, 12 mm by 12 mm package with a 2-wire interface and an 8 V to 9.5 V supply. Procurement should include a photograph of the top marking and a full comparison against the manufacturer pin table to avoid accepting a functionally similar but non-pin-compatible processor.
推薦
Analog Stereo Sound-Shaping Stage
The BD3402KS2 can form an analog stereo sound-shaping stage in equipment requiring coordinated two-channel bass and surround processing. Its built-in preamplifier makes the device more integrated than a collection of discrete boost filters, while soft switching helps suppress audible transients when operating modes change. The single-supply architecture is appropriate for compact legacy consumer systems with an available 9 V rail. Integration still demands verification of signal levels, accepted control levels, filter stability, and output loading from the manufacturer application circuit before the board is powered.
推薦
Two-Channel Audio Control Interface
The BD3402KS2's 2-wire interface can be used by a compatible cassette or home-audio controller to command supported sound-processing modes across two channels. This reduces control-line count compared with a parallel command architecture and leaves board space for the integrated preamplifier and sound-shaping circuitry. The interface voltage levels, timing, supported command set, and standby behavior were not included in the supplied verified excerpts. Consequently, a controller such as the P82B96 family should only be considered after the complete BD3402KS2 datasheet confirms logical and electrical compatibility.
推薦
推薦產品摘要
工程參考資料，適用於 BD3402KS2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Product Type | 2-channel analog audio signal processor |
| Brand | ROHM Semiconductor |
| Package | 64-SQFP-T, 12 mm x 12 mm |
| Supply Voltage Range | 8 V to 9.5 V |
| Power Supply Type | Single power supply |
| Number of Channels | 2 channels |
| Control Interface | 2-wire interface |
| Built-In Preamplifier | Yes, for cassette recording and playback |
| Lifecycle Status | Obsolete |
主要差異化特點
- Integrated cassette recording and playback preamplifier (對比BD3401KS)
- Two-channel processing in one package (對比Discrete stereo preamplifier network)
- Soft-switching noise-reduction behavior (對比Hard-switched mode-control implementation)
設計說明
Use the original ROHM application schematic and exact 64-terminal pin table when recreating or repairing the PCB. Place input, output, control, supply, and decoupling connections according to those verified nets rather than inferring functions from the BD3401KS reference in the product excerpt. Confirm whether exposed thermal or electrical pads exist beneath the 12 mm by 12 mm SQFP-T body and connect them exactly as specified by the manufacturer.
Design the supply around the documented 8 V to 9.5 V operating range and provide local high-frequency bypass at the IC power pins. The verified excerpts do not provide absolute maximum supply voltage, quiescent current, startup sequence, or output ripple, so those values must be obtained from the manufacturer datasheet before selecting capacitors or protection components. Avoid using a 12 V source without explicit overvoltage confirmation.
Route both analog channels symmetrically where practical and keep sensitive preamplifier inputs short, away from digital control lines and switching-supply nodes. Follow the manufacturer's grounding topology for the analog, digital, and supply-return connections because a single-supply analog processor can couple control or switching transients into low-level tape signals. Decoupling and grounding decisions must be checked against the complete application circuit rather than inferred from generic layouts.
Do not treat BD3401KS, BD3402KS2, or any generic 64-pin audio processor as automatically interchangeable. The verified material associates surround, bass-boost, and soft switching with BD3401KS but separately identifies the BD3402KS2 as a two-channel cassette sound processor. Before procurement, compare package dimensions, terminal numbering, supply limits, preamplifier topology, control protocol, and application circuit across the exact manufacturer documentation.
合規資訊
The supplied XIANGYU listing identifies BD3402KS2 as RoHS compliant and obsolete. REACH, lead-free, halogen-free, and conflict-minerals information was not provided. AEC-Q100 is not applicable to the documented home-audio processor category.
