WM8731CSEFL Equivalent & Substitute Parts

Part Overview

The WM8731CSEFL is a 24-bit audio codec interface manufactured by Cirrus Logic Inc., designed for portable internet audio applications. It integrates 2 ADCs and 2 DACs with Sigma-Delta conversion technology in a compact 28-QFN (5x5) surface mount package. 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 WM8731CSEFL has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or redesign requirements for applications currently utilizing this codec.

Substiute Parts

WM8731CSEFL

Cirrus Logic Inc.In Stock: 5173WM8731CSEFL Datasheet

Current PartRFQ

WM8904CGEFL/V

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WM8731CSEFL is determined by the following critical parameters:

• Resolution (Bits): 24-bit audio resolution
• ADC/DAC Configuration: 2 ADCs and 2 DACs
• Sigma-Delta Architecture: Required for audio quality performance
• Serial Data Interface: Digital communication protocol
• Supply Voltage Compatibility: Analog and digital supply ranges
• Operating Temperature Range: -40°C to 85°C
• Surface Mount Packaging: QFN package family
• Compliance Standards: RoHS and REACH compliance

The WM8904CGEFL/V qualifies as a manufacturer-recommended substitute. While it features a different package size (32-QFN versus 28-QFN) and enhanced specifications in certain parameters, it maintains functional equivalence through identical resolution, ADC/DAC count, Sigma-Delta architecture, and overlapping supply voltage ranges.

Parameter Comparison

Engineering Selection Recommendations

The WM8904CGEFL/V is the manufacturer-recommended substitute for the obsolete WM8731CSEFL. Both devices maintain identical core audio specifications: 24-bit resolution, 2 ADC/2 DAC configuration, and Sigma-Delta architecture. The WM8904CGEFL/V is currently in active production status, ensuring long-term supply availability.

Key considerations for selection:

Package Footprint: The WM8904CGEFL/V uses a 32-QFN (4x4) package compared to the 28-QFN (5x5) of the original part. PCB layout modifications are required.

Analog Supply Range: The WM8904CGEFL/V has a narrower analog supply range (1.71V ~ 2V) versus the WM8731CSEFL (1.8V ~ 3.6V). Verify that your design operates within the substitute's analog supply specification.

Digital Supply Range: Both devices support identical digital supply ranges (1.42V ~ 3.6V), ensuring compatibility in this domain.

Compliance: The WM8904CGEFL/V meets ROHS3 compliance and maintains REACH unaffected status, consistent with the original part's compliance profile.

Moisture Sensitivity: The WM8904CGEFL/V has MSL 3 (168 hours) versus MSL 1 (unlimited) for the original. Storage and handling procedures must account for this increased moisture sensitivity.

Frequently Asked Questions (FAQ)

Q: Can the WM8904CGEFL/V directly replace the WM8731CSEFL without PCB modifications?

A: No. The WM8904CGEFL/V uses a 32-QFN (4x4) package while the WM8731CSEFL uses a 28-QFN (5x5) package. The pinout and footprint differ, requiring PCB layout redesign.

Q: Are the audio performance specifications equivalent?

A: The devices share identical 24-bit resolution and 2 ADC/2 DAC configuration. The WM8904CGEFL/V provides slightly higher ADC S/N ratio (91 dB vs. 90 dB) and comparable DAC S/N ratio (96 dB vs. 100 dB). Both employ Sigma-Delta architecture for audio quality.

Q: What is the critical difference in supply voltage specifications?

A: The WM8904CGEFL/V analog supply range is 1.71V ~ 2V, narrower than the WM8731CSEFL range of 1.8V ~ 3.6V. Designs operating at analog supply voltages below 1.71V or above 2V are not compatible with the substitute. Digital supply ranges are identical (1.42V ~ 3.6V).

Q: Does moisture sensitivity affect component handling?

A: Yes. The WM8904CGEFL/V has MSL 3 (168 hours) compared to MSL 1 (unlimited) for the original. The substitute requires controlled storage conditions and has a limited shelf life after moisture exposure. Follow IPC-A-610 guidelines for MSL 3 components.

Q: Are both devices RoHS compliant?

A: Yes. The WM8731CSEFL is RoHS Compliant, and the WM8904CGEFL/V is ROHS3 Compliant. Both meet current environmental compliance requirements.

Q: What is the production status difference?

A: The WM8731CSEFL is obsolete with no further manufacturing. The WM8904CGEFL/V is in active production, ensuring availability for new designs and ongoing supply for existing applications.