WM8731CSEFL/R Equivalent & Substitute Parts

Part Overview

The WM8731CSEFL/R 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 architecture 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.

This part is currently classified as obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support legacy system maintenance or redesign initiatives.

Key Parameters

Parameter	Value
Manufacturer	Cirrus Logic Inc.
Category	Interface
Type	Audio
Resolution	24 bits
ADCs / DACs	2 / 2
Data Interface	Serial
Sigma Delta	Yes
S/N Ratio, ADCs / DACs (dB Typ)	90 / 100
Dynamic Range, ADCs / DACs (dB Typ)	90 / 95
Voltage - Supply, Analog	1.8V ~ 3.6V
Voltage - Supply, Digital	1.42V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	28-VFQFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

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

24-bit audio codec resolution maintained across all substitutes
Dual ADC and dual DAC configuration (2/2 architecture)
Sigma-Delta conversion technology
Serial data interface capability
Surface mount packaging with exposed pad design
Operating temperature range compatibility (-40°C to 85°C)
Supply voltage compatibility within specified ranges
RoHS and REACH compliance status

The WM8904CGEFL/RV qualifies as a manufacturer-recommended substitute based on these core electrical and mechanical parameters. While package geometry differs (32-QFN vs. 28-QFN), both devices maintain the essential functional specifications required for audio codec applications.

Parameter Comparison

Parameter	WM8731CSEFL/R	WM8904CGEFL/RV
Manufacturer	Cirrus Logic Inc.	Cirrus Logic Inc.
Resolution (Bits)	24	24
Number of ADCs / DACs	2 / 2	2 / 2
Sigma Delta	Yes	Yes
S/N Ratio, ADCs (dB Typ)	90	91
S/N Ratio, DACs (dB Typ)	100	96
Dynamic Range, ADCs (dB Typ)	90	—
Dynamic Range, DACs (dB Typ)	95	—
Voltage - Supply, Analog	1.8V ~ 3.6V	1.71V ~ 2V
Voltage - Supply, Digital	1.42V ~ 3.6V	1.42V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	28-VFQFN Exposed Pad	32-WFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The WM8904CGEFL/RV is designated as the manufacturer-recommended substitute for the obsolete WM8731CSEFL/R. Both devices are manufactured by Cirrus Logic Inc. and maintain compliance with RoHS and REACH regulations.

Key considerations for selection:

The WM8904CGEFL/RV is in active production status, ensuring long-term availability and supply chain stability compared to the obsolete WM8731CSEFL/R.
Both devices support identical 24-bit resolution and 2/2 ADC/DAC architecture with Sigma-Delta conversion.
Digital supply voltage ranges are identical (1.42V ~ 3.6V), ensuring compatibility with existing digital interface circuits.
Analog supply voltage range for the WM8904CGEFL/RV is narrower (1.71V ~ 2V) compared to the WM8731CSEFL/R (1.8V ~ 3.6V). Design verification is required if analog supply flexibility is critical.
Package footprint differs: 28-QFN (5x5) versus 32-QFN (4x4). PCB layout redesign is necessary.
MSL rating increases from 1 to 3, requiring adjusted moisture handling procedures during assembly.
S/N ratio for ADCs improves marginally (90 dB to 91 dB), while DAC S/N ratio decreases (100 dB to 96 dB).

Frequently Asked Questions (FAQ)

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

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

Q: What is the primary reason for substitution?

A: The WM8731CSEFL/R is obsolete. The WM8904CGEFL/RV is the manufacturer-recommended active alternative, ensuring continued supply availability and support.

Q: Are the supply voltage ranges compatible?

A: Digital supply voltage ranges are identical. Analog supply voltage for the WM8904CGEFL/RV is narrower (1.71V ~ 2V vs. 1.8V ~ 3.6V). Existing analog supply circuits must be evaluated for compatibility.

Q: What is the impact of the different MSL ratings?

A: The WM8904CGEFL/RV has MSL 3 (168 hours) versus MSL 1 (unlimited) for the WM8731CSEFL/R. This requires stricter moisture control during storage and assembly. Baking procedures may be necessary before reflow soldering.

Q: Are audio performance specifications equivalent?

A: Both devices maintain 24-bit resolution and identical ADC/DAC counts. S/N ratios differ slightly: ADC performance improves (90 to 91 dB), while DAC performance decreases (100 to 96 dB). Dynamic range specifications are not provided for the WM8904CGEFL/RV.

Q: Is this substitute approved by Cirrus Logic Inc.?

A: Yes. The WM8904CGEFL/RV is designated as the manufacturer-recommended substitute in the official parts list.

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