SI8241CB-B-IS1 - 2.5kV Class D Audio Driver | Silicon Labs
MPN: SI8241CB-B-IS1 ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SI8241CB-B-IS1 Overview
A Class D audio driver is a gate-driver interface between a low-power PWM control signal and the high-current, high-voltage switching MOSFETs in an audio power stage. The SI824x family combines differential or complementary gate-drive capability with dead-time control, helping prevent shoot-through and supporting clean amplification. Its role sits between the audio PWM modulator and the output power MOSFETs.
Verified features include a PWM input, a high-precision linear programmable dead-time generator, high latchup immunity greater than 100 V/ns, 1500 Vrms output-to-output isolation, and supply-voltage ratings of ±750 V. The Si824x family is described as suitable for Class D power amplifiers from 30 W and higher. The SI8241CB-B-IS1 is a two-channel 16-SOIC device; its exact output-current and propagation-delay details are not fully present in the supplied data.
The device is used where a PWM audio controller requires isolated, high-voltage gate-drive signaling. Typical system positions include the gate-driver stage in stereo Class D power amplifiers, isolated audio-output subsystems, and industrial or professional audio equipment where external MOSFETs form the switching output stage. The 16-SOIC package is surface-mount and compatible with standard PCB assembly methods.
Designers should verify dead-time settings against the selected MOSFET gate charges and the amplifier's switching requirements. Keep high-voltage gate-drive traces short, provide adequate bypassing, and observe the manufacturer's isolation and creepage guidance when routing output-side circuitry. The verified distributor inventory and pricing should be checked at the time of purchase because distributor data can change.
This page consolidates the verified distributor descriptions, package information, isolation claims, functional application context, and engineering cautions for SI8241CB-B-IS1. Unpublished electrical details, exact pin functions, lifecycle classification, and validated drop-in alternatives remain explicitly marked or excluded rather than inferred.
Drop-in alternatives for SI8241CB-B-IS1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8241CB-B-IS1R
✅ Drop-In📋 Reference alternative (not in catalog)
SI8241CB-B-IS1 Maximum Ratings & Electrical Characteristics
| Product Type | Two-channel Class D audio gate driver |
| Channel Count | 2 channels |
| Supply Voltage | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +125 C |
| Output Current | 0.5 A |
| Isolation Rating | 2.5 kV |
| PWM Input | Yes |
| Undervoltage Lockout | 10 V |
| Dead-Time Generator | High-precision linear programmable dead-time generator |
| Dead-Time Value | 1 us |
| Latchup Immunity | Greater than 100 V/ns |
| Output-to-Output Isolation | 1500 Vrms |
| Supply Voltage Rating | Plus or minus 750 V |
| Package | 16-SOIC, 0.154 inch body width, 3.90 mm width |
| Mounting Type | Surface mount |
| RoHS Status | RoHS compliant |
| Manufacturer Description | Class D audio driver with precision dead-time generator |
SI8241CB-B-IS1 16-soic, 0.154 inch body width, 3.90 mm width Pin Configuration Guide
Pin configuration for SI8241CB-B-IS1 (16-soic, 0.154 inch body width, 3.90 mm width package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for SI8241CB-B-IS1.
Refer to the datasheet for full pin configuration.
Typical Applications
SI8241CB-B-IS1 is suitable for 6 applications: Stereo Class D Power Amplifier, Isolated Audio Output Stage, 30 W-Class Audio Amplifier, PWM-Controlled Speaker Drive, Professional Audio Interface, Industrial Audio Control.
Stereo Class D Power Amplifier
SI8241CB-B-IS1 fits the gate-drive stage of a stereo Class D audio amplifier because the verified data identifies a two-channel 0.5 A Class D audio driver with PWM input. Each channel can interface with the external power MOSFETs that convert the PWM waveform into an amplified audio output. The 1 us dead-time feature helps control complementary switching transitions, while the 2.5 kV isolation listing supports systems that place the gate-drive function across an isolation boundary. The external MOSFETs, output filter, supply rails, and thermal design determine the final amplifier power and distortion performance.
Recommended
Isolated Audio Output Stage
The SI8241CB-B-IS1 is appropriate for an isolated audio output architecture requiring a high-side or barrier-separated gate-drive function. Its verified 2.5 kV isolation designation and 1500 Vrms output-to-output isolation figure distinguish it from a conventional non-isolated PWM buffer. In such systems, the driver receives a PWM signal and delivers controlled gate-drive energy to external switching devices. PCB creepage, clearance, barrier construction, and safety standards must be independently designed; the device rating alone does not certify the completed amplifier.
Recommended
30 W-Class Audio Amplifier
The Si824x family is identified in the verified data as a driver solution for Class D audio power amplifiers of 30 W and higher, making SI8241CB-B-IS1 relevant to compact stereo and professional audio products. The driver handles the control-to-gate interface while external MOSFETs perform the high-current switching. Designers should calculate MOSFET conduction and switching loss, verify the 0.5 A driver listing against peak gate current, and select gate resistors and dead time that preserve low distortion. The amplifier's speaker load and supply voltage determine actual output capability.
Recommended
PWM-Controlled Speaker Drive
SI8241CB-B-IS1 can be used when a PWM audio subsystem requires precise timing between two switching output channels. The verified 1 us dead-time value and programmable dead-time generator help establish non-overlap between MOSFET gate commands, reducing the risk of shoot-through. In a speaker-drive design, the device is normally positioned before the power MOSFETs, not directly at the speaker output. Output filtering, speaker impedance, amplifier protection, and thermal shutdown remain functions of the surrounding power stage and system controller.
Recommended
Professional Audio Interface
The SI8241CB-B-IS1 is suitable for the isolated gate-drive section of professional audio equipment that separates a low-noise control domain from a switching power domain. Its two-channel structure supports dual audio outputs, while the PWM interface can accept modulation signals from an audio controller. In a rack-mount or stage-amplifier design, careful attention should be paid to ground partitioning, isolation boundaries, high-voltage creepage, and EMI containment. The verified 10 V UVLO and -40 C to +125 C listed range support platform planning, subject to confirmation for the exact ordering code.
Recommended
Industrial Audio Control
SI8241CB-B-IS1 can support industrial audio-control or announcement systems that use external MOSFETs to drive speakers or audio loads. The verified two-channel architecture allows independent gate-drive signaling for a dual output arrangement, while PWM input integrates with digital modulation. Industrial systems should verify whether the application requires only functional isolation or a regulated reinforced-isolation barrier, and should validate EMC emissions, surge exposure, temperature, and fault behavior at the completed-product level. The IC is a driver interface, not a complete amplifier or speaker protection circuit.
Recommended
Recommended Products Summary
Engineering reference data for SI8241CB-B-IS1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8241CB-B-IS1R |
|---|---|---|
| Brand | Silicon Labs | Silicon Labs |
| Package | 16-SOIC | 16-SOIC |
| Channel Count | 2 channels | 2 channels |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Output Current | 0.5 A | 0.5 A |
| Isolation | 2.5 kV | 2.5 kV |
| Dead-Time Feature | Programmable, 1 us | Programmable dead-time generator, 1 us |
| Input Type | PWM | PWM |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C |
| RoHS | Compliant | RoHS compliant |
Key Differentiators
- Dedicated Class D audio-driver positioning (vs Generic isolated gate drivers)
- Two-channel integration (vs Single-channel audio drivers)
- Isolation-focused audio application (vs Non-isolated PWM buffer ICs)
Design Notes
The verified distributor data lists a 4.5 V to 5.5 V supply range, a 0.5 A driver rating, and a 10 V UVLO feature. Confirm the exact supply sequencing and bypass requirements in the manufacturer datasheet before layout. Because the supplied information does not include the complete quiescent-current or power-consumption table, do not estimate final thermal performance from the driver rating alone; include the external MOSFET and system supply behavior in the power budget.
Keep the PWM input traces and gate-drive outputs short, with placement of the driver close to the external MOSFET gate loops. Preserve the isolation barrier and maintain the required creepage and clearance; the verified 2.5 kV and 1500 Vrms isolation figures describe the component, not a finished-board safety certification. Decoupling capacitors and gate resistors should follow the manufacturer reference layout, especially when the output-side switching node is fast and high voltage.
Do not treat the listed 1 us dead time as automatically optimal for every MOSFET pair. Dead time depends on MOSFET turn-off delay, gate resistance, switching frequency, output capacitance, and acceptable distortion. Validate both channels with an oscilloscope, check that the programmed dead time prevents shoot-through, and test thermal performance at the intended speaker load. The supplied data does not provide a complete timing table, so final values must come from the official datasheet.
Compliance Information
The supplied distributor data identifies the package as RoHS compliant for the related SI8241CB-B-IS1R listing. REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification information are not provided. AEC-Q100 is not applicable unless an automotive-qualified ordering code is separately documented.
