WM8731CLSEFL Equivalent & Substitute Parts

Part Overview

The WM8731CLSEFL is a 24-bit audio codec interface manufactured by Cirrus Logic Inc., designed for portable internet applications. It integrates 2 ADCs and 2 DACs with Sigma Delta modulation, delivering 90 dB S/N ratio on the ADC side and 100 dB on the DAC side. The device operates across analog supply voltages of 1.8V to 3.6V and digital supply voltages of 1.42V to 3.6V, with an operating temperature range of -40°C to 85°C.

The WM8731CLSEFL is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems currently utilizing this codec.

Substiute Parts

WM8731CLSEFL

Cirrus Logic Inc.In Stock: 6234WM8731CLSEFL Datasheet

Current PartRFQ

WM8904CGEFL/V

Cirrus Logic Inc.In Stock: 3591WM8904CGEFL/V Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WM8731CLSEFL is determined by the following critical parameters:

• 24-bit audio codec resolution
• 2 ADC and 2 DAC channel configuration
• Sigma Delta modulation architecture
• Serial data interface capability
• Surface mount packaging with exposed pad
• Operating temperature range of -40°C to 85°C
• Analog and digital supply voltage compatibility windows
• RoHS and REACH compliance status

The WM8904CGEFL/V qualifies as a substitute based on matching resolution, ADC/DAC count, Sigma Delta architecture, serial interface support, surface mount technology, operating temperature range, and regulatory compliance. Differences in package size (32-QFN vs. 28-QFN) and specific voltage supply ranges require design-level evaluation for PCB layout and power delivery considerations.

Parameter Comparison

Engineering Selection Recommendations

The WM8904CGEFL/V is an active product with current manufacturing support and ROHS3 compliance, providing supply chain continuity for the obsolete WM8731CLSEFL. Both devices share identical ADC/DAC configurations, 24-bit resolution, and Sigma Delta architecture, ensuring functional equivalence at the codec level.

Design considerations for substitution include:

• Package footprint change from 28-QFN (5x5) to 32-QFN (4x4) requires PCB layout modification
• Analog supply voltage range narrowing from 1.8V–3.6V to 1.71V–2V necessitates power supply design review
• MSL rating increase from 1 to 3 affects moisture handling and storage protocols
• DAC S/N ratio reduction from 100 dB to 96 dB may impact audio fidelity in noise-critical applications

The WM8904CGEFL/V is suitable for new designs and production transitions where the specified voltage and package constraints are accommodated.

Frequently Asked Questions (FAQ)

Q: Can the WM8904CGEFL/V directly replace the WM8731CLSEFL without PCB modifications?

A: No. The package footprint differs (28-QFN vs. 32-QFN), requiring PCB layout redesign. Pin assignments and signal routing must be verified against device datasheets before implementation.

Q: What is the impact of the narrower analog supply voltage range on the WM8904CGEFL/V?

A: The WM8904CGEFL/V analog supply range is 1.71V to 2V, compared to 1.8V to 3.6V on the WM8731CLSEFL. Existing power delivery circuits designed for the wider range must be re-evaluated to ensure stable operation within the narrower specification.

Q: Are there audio performance differences between these codecs?

A: Both devices deliver 24-bit resolution with Sigma Delta modulation. The WM8904CGEFL/V ADC S/N ratio is 91 dB (vs. 90 dB), while DAC S/N ratio is 96 dB (vs. 100 dB). The 4 dB reduction in DAC performance may be audible in high-fidelity applications.

Q: What does the MSL rating change from 1 to 3 mean for handling and storage?

A: MSL 1 allows unlimited shelf life without moisture baking. MSL 3 requires moisture baking after 168 hours of exposure to ambient humidity. Storage and assembly procedures must comply with IPC-A-610 standards for MSL 3 components.

Q: Is the WM8904CGEFL/V available in the same packaging format?

A: No. The WM8904CGEFL/V uses 32-QFN (4x4) with exposed pad, while the WM8731CLSEFL uses 28-QFN (5x5) with exposed pad. Both are surface mount QFN packages but with different pin counts and footprints.

Q: Are both devices RoHS compliant?

A: Yes. The WM8731CLSEFL is RoHS Compliant, and the WM8904CGEFL/V is ROHS3 Compliant. Both meet current environmental and hazardous substance restrictions.