WM9094ECS/R - 2W Mono Class D/AB Amplifier | Cirrus Logic
MPN: WM9094ECS/R ✗ End of LifeWM9094ECS/R Overview
An audio amplifier is an integrated circuit that converts an input audio signal into sufficient output power to drive a loudspeaker or other transducer. Class AB amplifiers provide linear operation with comparatively continuous output current, while Class D amplifiers switch the output stage to improve power-conversion efficiency. The WM9094ECS/R supports both operating modes, giving designers flexibility according to their efficiency, distortion, and thermal requirements.
Key features include Class D and Class AB output capability, a 2 W maximum output-power rating into 4 ohms, integrated depop circuitry, integrated thermal protection, and a surface-mount 20-WCSP package. The 2.7 V minimum supply voltage supports portable and space-constrained equipment, while the 5.5 V maximum supply voltage accommodates common low-voltage power rails.
The WM9094ECS/R is identified as a mono, one-channel amplifier rather than a multi-channel power amplifier. Its compact 2.53 mm by 2.07 mm package can reduce board area in mobile accessories, personal-audio products, and other integrated audio equipment. The manufacturer and distributor listings identify it as an ultra-low-power audio subsystem and list the part as obsolete.
Typical applications include compact speaker systems, portable audio accessories, and low-voltage embedded products where a single amplified channel is sufficient. System-level implementation must account for the 2.7 V to 5.5 V supply range, speaker impedance, output power, thermal conditions, and the small-area land-pattern requirements of the 20-WCSP package.
The principal design consideration is the obsolete lifecycle status. Designers should verify availability, source quality, and long-term supply before committing to a new production design. For a new design with obsolete risk, engineers may need to qualify an alternative rather than assume that any Class D or Class AB amplifier is pin compatible.
This page consolidates the verified distributor specifications, lifecycle information, package details, sourcing links, practical application guidance, and an explicit assessment of replacement availability. It also separates documented parameters from missing technical data instead of presenting unverified electrical characteristics as guaranteed specifications.
Drop-in alternatives for WM9094ECS/R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesWM9094ECS/R Maximum Ratings & Electrical Characteristics
| Product Type | 1-channel (mono) audio amplifier IC |
| Output Type | Class D, Class AB |
| Maximum Output Power | 2 W into 4 ohm |
| Output Channels | 1 channel |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Package | 20-WCSP (2.53 mm x 2.07 mm) |
| Mounting Type | Surface mount |
| Depop Circuitry | Integrated |
| Thermal Protection | Integrated |
| Description | IC CODEC AUD HUB MULTI-CH WCSP |
| Series | - |
| Part Status | Obsolete |
| Supplier Packaging | Tape and reel |
| Manufacturer | Cirrus Logic Inc. |
WM9094ECS/R 20-wcsp (2.53 mm x 2.07 mm) Pin Configuration Guide
Pin configuration for WM9094ECS/R (20-wcsp (2.53 mm x 2.07 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for WM9094ECS/R.
Refer to the datasheet for full pin configuration.
Typical Applications
WM9094ECS/R is suitable for 6 applications: Compact Portable Speaker, Personal Audio Accessory, Embedded Audio Control Board, Low-Voltage Audio Hub, Battery-Powered Monitoring Audio, Industrial Audio Module.
Compact Portable Speaker
The WM9094ECS/R fits a compact speaker design that requires one amplified channel and no more than 2 W into a 4-ohm load. Its documented 2.7 V to 5.5 V supply range is suitable for low-voltage portable systems, while Class D and Class AB operation gives the designer a choice of output approaches. The 20-WCSP package measuring 2.53 mm by 2.07 mm also conserves board area. Designers must confirm acoustic output, battery behavior, thermal conditions, and long-term availability before production use.
Recommended
Personal Audio Accessory
The WM9094ECS/R can serve as the mono amplification stage in a small personal-audio accessory when the speaker load is 4 ohms and the required peak output is no greater than 2 W. Its 2.7 V minimum operating voltage supports low-energy designs, and the surface-mount 20-WCSP package helps minimize PCB footprint. The integrated depop and thermal protection features identified by the distributor data support practical speaker drive. Engineers should verify acoustics and acoustic limits directly against the manufacturer datasheet.
Recommended
Embedded Audio Control Board
The WM9094ECS/R is suitable for an embedded control board that must generate a single mono audio channel within a compact area. Its 20-WCSP footprint is useful where board space is constrained, and the 2.7 V to 5.5 V supply range can align with a low-voltage system rail. The device supports both Class D and Class AB operation, although the supplied evidence does not provide mode-by-mode efficiency or distortion. A new design must also address the part's documented obsolete status.
Recommended
Low-Voltage Audio Hub
The WM9094ECS/R can contribute one mono Class D or Class AB output channel to a low-voltage audio-hub architecture. Its 2 W capability into 4 ohms and 2.7 V to 5.5 V operating range align with compact consumer-audio signal paths, while integrated depop and thermal protection address common loudspeaker-interface concerns. Verification must include the 20-WCSP land pattern, pin functions, output configuration, and thermal behavior. Because the available status information marks the device obsolete, long-term sourcing is a gating requirement.
Recommended
Battery-Powered Monitoring Audio
For battery-powered monitoring equipment needing one compact speaker channel, the WM9094ECS/R provides a documented 2 W output capability at low supply voltage. Class D operation may be considered for a power-conscious implementation, while Class AB remains available for designs that require an alternative output mode. The integrated thermal and depop features provide useful baseline protection. The supplied data does not specify quiescent current, efficiency, or distortion, so battery-life and acoustic design claims require additional manufacturer data or testing.
Recommended
Industrial Audio Module
The WM9094ECS/R can be evaluated for a compact industrial audio module that requires one low-voltage mono output channel. Its surface-mount 20-WCSP package reduces board area, and the 2.7 V to 5.5 V range supports industrial systems using regulated low-voltage rails. Integrated thermal protection is particularly relevant in enclosed equipment, but the available data does not provide junction-temperature limits or thermal resistance. Engineering validation must therefore include thermal testing, EMI assessment, and a resolution for the obsolete supply status.
Recommended
Recommended Products Summary
Engineering reference data for WM9094ECS/R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Product Type | 1-channel (mono) audio amplifier IC |
| Output Type | Class D, Class AB |
| Maximum Output Power | 2 W into 4 ohm |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Package | 20-WCSP (2.53 mm x 2.07 mm) |
| Brand | Cirrus Logic |
| Mounting Type | Surface mount |
| Integrated Features | Depop and thermal protection |
| Lifecycle Status | Obsolete |
Key Differentiators
- Selectable Class D and Class AB operating modes (vs Single-mode generic Class D amplifier)
- Compact mono output footprint (vs Larger-package 2 W mono amplifier)
- Low-voltage operation with integrated protection (vs Higher-voltage or externally protected amplifier)
Design Notes
Do not assume the integrated thermal protection eliminates the need for thermal analysis. The verified data confirms thermal protection but does not provide junction-temperature limits, thermal resistance, or dissipation curves. Review the manufacturer datasheet package information, estimate worst-case conduction and switching loss at the selected Class D or Class AB mode, and keep the 20-WCSP within its documented operating limits. For an obsolete part, verify that the original lot and manufacturer marking remain suitable for the required mission profile.
Base the PCB footprint on the manufacturer drawing for the 20-WCSP package rather than the simplified 2.53 mm by 2.07 mm body description alone. Body dimensions do not establish the ball pitch, pad geometry, solder-mask pattern, or exposed-pad arrangement. Confirm land geometry, paste volume, reflow profile, and pad numbering before releasing artwork. Because the supplied evidence does not provide a complete pinout, the datasheet must also be used to confirm every audio, power, ground, and control connection.
Design the supply path for the documented 2.7 V to 5.5 V operating range and for the actual Class D or Class AB mode selected. The available information establishes up to 2 W output into 4 ohms but does not provide efficiency, quiescent current, output configuration, or peak-current limits. Those missing values must be established before calculating battery life, regulator headroom, or copper capability. Add local input decoupling according to the manufacturer layout and stability guidance once those details are available.
A generic 2 W mono amplifier is not automatically a drop-in replacement. The original uses a specialized 20-WCSP footprint and supports two named output modes, but the supplied cross-reference evidence does not identify a pin-compatible substitute. Avoid selecting a replacement based only on wattage, channel count, or Class D labeling. Require a verified land-pattern match, pin-by-pin comparison, equivalent supply range, matching output architecture, and adequate protection before approving a substitution.
Compliance Information
The supplied verified data does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance status has been inferred from the distributor listings.
