SI8241BB-B-IS1R - Isolated Class-D Audio Driver | Silicon Labs
MPN： SI8241BB-B-IS1R ✗ 停產SI8241BB-B-IS1R 概覽
An isolated gate driver is an interface and power-management semiconductor that transfers control signals while maintaining galvanic isolation between a logic-side controller and a high-voltage or high-power audio stage. The Si8241 family targets Class-D amplification, where MOSFET switching drives loudspeaker transducers efficiently. Isolation reduces common-mode coupling and ground-loop risk between the controller and power converter, while the programmable dead-time function helps control transition overlap and audio distortion.
Key verified characteristics include a 4.5 V to 5.5 V supply range, two driver channels, PWM input, high latchup immunity of 1 µs, and an operating temperature range of -40°C to 125°C. The manufacturer product information identifies the device as an audio gate driver for high-fidelity Class-D amplification, emphasizing precise dead-time adjustment as a way to balance total harmonic distortion and system efficiency.
The part is associated with isolated-driver functionality rather than a conventional line-level audio output stage. Its isolation barrier and driver outputs are intended for a power MOSFET stage whose voltage and current exceed ordinary logic-device ratings. Because the verified excerpts do not provide complete timing, output-current, propagation-delay, isolation-voltage, or truth-table values, those specifications remain marked as data needed rather than inferred.
Typical application contexts include isolated Class-D audio amplifiers, full-bridge and half-bridge speaker power stages, industrial audio equipment, consumer-audio modules, and systems where the controller must remain separated from the switching node. The PWM interface makes it suitable for audio-control architectures that already generate a differential bridge command.
Designers should verify the complete datasheet pinout, isolation ratings, dead-time programming method, recommended external components, and MOSFET compatibility before layout. In particular, keep the isolation barrier free of copper and maintain the manufacturer-specified creepage and clearance requirements; do not treat the SOIC outline alone as proof of a complete replacement.
This page consolidates verified manufacturer and distributor information, separates known electrical facts from missing parameters, and provides application and sourcing guidance that can be checked against the original datasheet before design release.
直接替換替代品，適用於 SI8241BB-B-IS1R — 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： SI8241BB-B-IS1R （相同外形與佔位） — 差異在於 Channel Count, Dead-Time Control, Latchup Immunity, Package, Product Type.
SI8241BB-B-IS1
✅ 直接替換聯絡詢價
查看資料表 →SI8241BB-D-IS1R
✅ 直接替換聯絡詢價
查看資料表 →SI8241BB-IS1
✅ 直接替換📋 參考替代品（不在目錄中）
SI8241BB-B-IS1R 規格
| Product Type | Isolated Class-D audio driver |
| Supply Voltage VS | 4.5 V to 5.5 V |
| 工作溫度 | -40°C to +125°C |
| Channel Count | 2 channels |
| Input Type | PWM input |
| Dead-Time Generator | High-precision linear programmable dead-time generator |
| Latchup Immunity | 1 µs |
| Output-to-Output Isolation | 1500 Vrms |
| Supply Voltage Isolation | ±750 V |
| Latchup Transient Tolerance | >100 V/ns |
| Package Type | SOIC-16 |
| Package Outline | MS-012AC |
| Package Width | 3.90 mm |
| 安裝類型 | Surface mount |
| RoHS 狀態 | Compliant |
| Manufacturer | Silicon Labs |
| DigiKey Category | Audio Special Purpose |
| 腳位數 | 16 pins |
SI8241BB-B-IS1R 3.90 mm 腳位配置指南
SI8241BB-B-IS1R（3.90 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SI8241BB-B-IS1R.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI8241BB-B-IS1R 適用於 6 應用s: Isolated Class-D Speaker Amplifier, Full-Bridge Audio Power Stage, Industrial Audio Control Module, Consumer Audio Amplifier Board, High-Power Audio MOSFET Gate Drive, Isolated Audio Feedback Interface.
Isolated Class-D Speaker Amplifier
SI8241BB-B-IS1R fits an isolated Class-D speaker amplifier because it accepts PWM control signals and provides two isolated driver channels in a 16-SOIC package. The high-precision linear programmable dead-time generator helps coordinate complementary MOSFET switching and reduce overlap-related distortion. Its verified 4.5 V to 5.5 V supply range suits a regulated low-voltage gate-drive rail, while the 1500 Vrms output-to-output isolation specification supports separation between driver channels. External MOSFETs, DC bias networks, dead-time components, and thermal margin still require design verification.
推薦
Full-Bridge Audio Power Stage
The SI8241BB-B-IS1R can be used to drive a full-bridge or bridge-based Class-D output when the controller supplies the required PWM signals. Two driver channels and programmable dead time help define switch transitions, which is important when minimizing crossover distortion and shoot-through. The verified operating range of -40°C to +125°C supports designs where the gate-driver board is thermally or electrically separated from the amplifier output. The exact channel polarity, timing limits, and output-drive ratings must be taken from the current manufacturer datasheet before schematic release.
推薦
Industrial Audio Control Module
SI8241BB-B-IS1R is suitable for industrial audio-control modules that need a controlled PWM interface and reinforced isolation between a supervisory controller and a switching power stage. The verified -40°C to +125°C operating range is appropriate for industrial temperature expectations, subject to system thermal validation. Its isolation barrier can reduce ground-loop coupling when the audio power stage uses a separate reference domain. Designers should preserve the manufacturer-specified clearance and creepage around the isolation barrier and account for leakage, insulation, and surge requirements at the system level.
推薦
Consumer Audio Amplifier Board
For consumer-audio boards, SI8241BB-B-IS1R provides a dedicated interface between a PWM-producing audio controller and external Class-D power MOSFETs. Using an isolated driver can simplify partitioning of logic, power, and speaker-return domains while preserving high-fidelity switching control. The 4.5 V to 5.5 V operating range permits use with a regulated gate-drive supply, but the board designer must check startup sequencing, undervoltage behavior, and dead-time settings. The 16-SOIC package also requires attention to creepage, pad layout, and thermal performance during continuous audio playback.
推薦
High-Power Audio MOSFET Gate Drive
SI8241BB-B-IS1R is intended for gate-drive interfaces in high-power audio amplifiers greater than 30 W, as stated in the verified Si824x family description. Its PWM input and programmable dead-time function provide the timing framework for external switching devices, while the two-channel configuration supports complementary or bridge drive arrangements. The driver itself does not replace the external MOSFETs, gate resistors, bias network, or output filter. Select external transistors and passive components only after checking the datasheet’s output current, voltage, timing, and thermal limits, which were not included in the supplied excerpts.
推薦
Isolated Audio Feedback Interface
The isolated-driver architecture of SI8241BB-B-IS1R can support audio systems where power-stage switching and low-level control or feedback circuitry must remain in separate electrical domains. Isolation can help reduce conducted common-mode effects between a controller and a high-energy output section, although system-level safety still depends on the complete barrier implementation. The verified 1500 Vrms output-to-output isolation value should be treated as a component specification, not a substitute for applying the required PCB spacing and insulation system. Confirm channel mapping and feedback timing against the manufacturer pinout.
推薦
推薦產品摘要
工程參考資料，適用於 SI8241BB-B-IS1R — 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 | SI8241BB-B-IS1 | SI8241BB-D-IS1R | SI8241BB-IS1 |
|---|---|---|---|---|
| Package | SOIC-16, MS-012AC | 16-SOIC | 16-pin SOIC | 16-SOIC |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Product Type | Audio Special Purpose / isolated Class-D driver | Audio Line Driver, 2 Channel | Related Class-D Audio Driver | Isolated audio driver family variant |
主要差異化特點
- Integrated isolated Class-D driver positioning (對比SI8641BB-B-IS1R)
- Programmable dead-time architecture (對比SI8241BB-D-IS1R)
- Two-channel isolated driver in SOIC-16 (對比SI8241BB-B-IS1)
設計說明
Design the gate-drive supply so it remains within the verified 4.5 V to 5.5 V VS range, including startup and fault transients. Place supply decoupling close to the device pins and verify the recommended capacitor values against the current manufacturer datasheet. Because the external MOSFETs determine most of the power-stage energy, calculate their switching and conduction losses separately and ensure the driver supply does not collapse during high audio demand.
Keep the isolation barrier free of copper, solder mask bridges, test pads, and high-current switching paths. Follow the manufacturer’s creepage and clearance guidance for the 1500 Vrms isolation capability and do not route power-stage current across the barrier. Confirm the final footprint against MS-012AC and the manufacturer land pattern before fabrication, because the supplied excerpts do not include a verified pin-number table.
Do not substitute a generic SOIC-16 part solely because the pin count matches. Verify channel polarity, input thresholds, dead-time programming, isolation ratings, propagation delay, output-current capability, and external MOSFET requirements. Excessive dead time can increase distortion, while insufficient dead time can cause shoot-through; the correct value must come from the full datasheet and the selected MOSFET gate charges.
Estimate driver dissipation from the actual supply voltage, output-state duty cycle, output capacitance, switching frequency, and ambient temperature. The available data confirms a -40°C to +125°C operating range but does not provide a complete thermal-resistance table. Use conservative copper and thermal-via arrangements, and validate junction temperature with the final PCB, enclosure, audio waveform, and surrounding components.
合規資訊
The verified distributor specification explicitly lists the package as RoHS compliant. REACH, AEC-Q100 status, lead-free status, halogen-free status, and conflict-minerals status were not provided in the verified data.
