WM8955LSEFL/R Equivalent & Substitute Parts

Part Overview

The WM8955LSEFL/R is a 2-channel audio DAC with 48k sampling rate, manufactured by Cirrus Logic Inc. This component is classified as Obsolete, making it necessary to identify equivalent substitute parts for new designs or production continuity. The part operates with a supply voltage range of 1.71V to 3.6V and is housed in a 32-QFN (5x5) surface mount package with exposed pad.

Substiute Parts

WM8955LSEFL/R

Cirrus Logic Inc.In Stock: 19335WM8955LSEFL/R Datasheet

Current PartRFQ

CS43L22-CNZ

Cirrus Logic Inc.In Stock: 5280CS43L22-CNZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WM8955LSEFL/R is based on the following critical parameters:

• Functional Type: Audio DAC with 2-channel output capability
• Data Interface Compatibility: I2S protocol support (primary interface for audio DACs)
• Supply Voltage Range: Overlap or compatibility with 1.71V ~ 3.6V operating range
• Sampling Rate: Minimum 48k support (higher rates are acceptable for backward compatibility)
• Package Type: Surface mount QFN with exposed pad (allows PCB layout compatibility assessment)
• Operating Temperature Range: Coverage of -25°C ~ 85°C or broader
• Compliance Standards: REACH and RoHS status for regulatory alignment

The substitute part CS43L22-CNZ meets these criteria as a 2-channel audio DAC with I2S interface, higher sampling rate capability (96k), and compatible supply voltage range, though with different package dimensions (40-QFN vs. 32-QFN).

Parameter Comparison

Engineering Selection Recommendations

The CS43L22-CNZ serves as a functional substitute for the obsolete WM8955LSEFL/R based on the following factors:

Functional Compatibility: Both parts are 2-channel audio DACs with I2S interface support. The CS43L22-CNZ supports higher sampling rates (96k vs. 48k), providing enhanced audio fidelity for applications requiring greater bandwidth.

Supply Voltage Consideration: The CS43L22-CNZ operates within 1.65V ~ 2.63V, which overlaps with the lower portion of the WM8955LSEFL/R range (1.71V ~ 3.6V). Circuit design must verify that the target supply voltage falls within both ranges or that voltage regulation is adjusted accordingly.

Temperature Range: The CS43L22-CNZ extends the lower operating limit to -40°C, providing broader environmental coverage compared to the original part's -25°C minimum.

Package Transition: The CS43L22-CNZ uses a 40-QFN (6x6) package versus the 32-QFN (5x5) of the original part. PCB layout redesign is required to accommodate the larger footprint and pin count increase.

Regulatory Compliance: Both parts maintain REACH Unaffected status and equivalent moisture sensitivity levels, ensuring compliance continuity.

Product Availability: The CS43L22-CNZ is designated Last Time Buy, indicating limited future availability. Long-term production planning should account for this status.

Frequently Asked Questions (FAQ)

Q: Can the CS43L22-CNZ directly replace the WM8955LSEFL/R without PCB modifications?

A: No. The CS43L22-CNZ uses a 40-QFN (6x6) package compared to the 32-QFN (5x5) of the original part. PCB layout redesign is required to accommodate the different footprint and increased pin count (40 pins vs. 32 pins).

Q: What is the impact of the different supply voltage ranges?

A: The CS43L22-CNZ operates within 1.65V ~ 2.63V, which is narrower than the WM8955LSEFL/R range of 1.71V ~ 3.6V. Verify that your circuit's supply voltage falls within 1.65V ~ 2.63V. If your design uses voltages above 2.63V, the CS43L22-CNZ is not suitable without additional voltage regulation.

Q: Does the higher sampling rate of the CS43L22-CNZ (96k vs. 48k) affect compatibility?

A: Higher sampling rate capability is backward compatible. The CS43L22-CNZ can operate at 48k sampling rate, matching the original part's performance. The 96k capability provides additional headroom for future applications requiring higher audio fidelity.

Q: Are there differences in the I2S interface implementation?

A: Both parts support I2S protocol. The WM8955LSEFL/R additionally supports DSP interface, which the CS43L22-CNZ does not. If your design relies on DSP interface functionality, the CS43L22-CNZ is not a suitable substitute.

Q: What is the significance of the product status difference?

A: The WM8955LSEFL/R is Obsolete, meaning it is no longer manufactured. The CS43L22-CNZ is Last Time Buy, indicating limited production windows remain. For new designs, plan component procurement immediately, as both parts have restricted availability.

Q: Are there any compliance or certification differences?

A: Both parts maintain identical REACH Unaffected status and equivalent moisture sensitivity levels (MSL 3, 168 hours). No compliance barriers exist for substitution from a regulatory standpoint.