WM8940CGEFL/RV Equivalent & Substitute Parts

Part Overview

The WM8940CGEFL/RV is a mono audio codec interface IC manufactured by Cirrus Logic Inc., designed for audio signal processing applications requiring serial data interface and integrated speaker driver functionality. This component integrates a 24-bit analog-to-digital converter (ADC) and digital-to-analog converter (DAC) in a compact 24-QFN surface mount package.

The WM8940CGEFL/RV carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this audio interface architecture.

Key Parameters

Parameter	Value
Manufacturer Part Number	WM8940CGEFL/RV
Manufacturer	Cirrus Logic Inc.
Category	Interface
Type	Audio
Resolution (Bits)	24 b
Data Interface	Serial
Number of ADCs / DACs	1 / 1
Sigma Delta	Yes
S/N Ratio, ADCs / DACs (dB) Typ	94 / 98
Voltage - Supply, Analog	2.5V ~ 3.6V
Voltage - Supply, Digital	1.71V ~ 3.6V
Operating Temperature	-25°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-VFQFN Exposed Pad
Supplier Device Package	24-QFN (4x4)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the WM8940CGEFL/RV is determined by strict equivalence across the following critical parameters:

Audio codec functionality with mono speaker driver capability
24-bit serial data interface architecture
Single ADC / DAC configuration with Sigma Delta modulation
Signal-to-noise ratio specifications: 94 dB (ADC) / 98 dB (DAC)
Analog supply voltage range: 2.5V ~ 3.6V
Digital supply voltage range: 1.71V ~ 3.6V
Operating temperature range: -25°C ~ 85°C
Surface mount packaging in 24-QFN (4x4) form factor with exposed pad
RoHS3 compliance and REACH unaffected status
Moisture sensitivity level MSL 3 (168 Hours)

The WM8940KGEFL/RV qualifies as a direct substitute based on complete parameter alignment across all electrical, thermal, and mechanical specifications.

Parameter Comparison

Parameter	WM8940CGEFL/RV (Main)	WM8940KGEFL/RV (Substitute)
Manufacturer	Cirrus Logic Inc.	Cirrus Logic Inc.
Category	Interface	Interface
Type	Audio	Audio
Resolution (Bits)	24 b	24 b
Data Interface	Serial	Serial
Number of ADCs / DACs	1 / 1	1 / 1
Sigma Delta	Yes	Yes
S/N Ratio, ADCs / DACs (dB) Typ	94 / 98	94 / 98
Voltage - Supply, Analog	2.5V ~ 3.6V	2.5V ~ 3.6V
Voltage - Supply, Digital	1.71V ~ 3.6V	1.71V ~ 3.6V
Operating Temperature	-25°C ~ 85°C	-25°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad
Supplier Device Package	24-QFN (4x4)	24-QFN (4x4)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The WM8940KGEFL/RV is the manufacturer-recommended substitute for the obsolete WM8940CGEFL/RV. Both components share identical electrical specifications, thermal operating ranges, and mechanical packaging requirements. The WM8940KGEFL/RV maintains Active product status, ensuring continued availability and manufacturing support.

Both parts comply with RoHS3 requirements and carry REACH unaffected designation, satisfying regulatory compliance obligations. The identical MSL 3 rating (168 Hours) requires equivalent moisture control during storage and handling.

Selection of the WM8940KGEFL/RV eliminates obsolescence risk while preserving full functional and physical compatibility with existing PCB designs and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the WM8940KGEFL/RV be used as a direct replacement for the WM8940CGEFL/RV?

A: Yes. The WM8940KGEFL/RV is a direct substitute. All electrical parameters, supply voltage ranges, signal-to-noise specifications, operating temperature limits, and package dimensions are identical. No circuit modifications or PCB redesign is required.

Q: What is the primary difference between these two parts?

A: The WM8940CGEFL/RV is Obsolete, while the WM8940KGEFL/RV maintains Active product status. This distinction affects supply chain availability and long-term manufacturing support.

Q: Are the package dimensions and pin configurations identical?

A: Yes. Both parts use the 24-QFN (4x4) surface mount package with exposed pad and 24-VFQFN case designation. Pin-to-pin compatibility is complete.

Q: Do both parts require the same moisture handling procedures?

A: Yes. Both components carry MSL 3 (168 Hours) moisture sensitivity level. Identical storage, handling, and reflow procedures apply to both parts.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Regulatory compliance status is equivalent.

Q: What supply voltage ranges must be maintained for proper operation?

A: Analog supply voltage must remain within 2.5V ~ 3.6V, and digital supply voltage within 1.71V ~ 3.6V. Both parts operate identically across these ranges.

Q: Is the serial data interface protocol identical between these parts?

A: Yes. Both components implement identical 24-bit serial data interface architecture with single ADC/DAC configuration and Sigma Delta modulation.

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