MC145481SD Equivalent & Substitute Parts

Part Overview

The MC145481SD is a PCM codec-filter interface IC manufactured by NXP USA Inc., designed for audio signal processing applications requiring PCM audio interface functionality. This component operates at 3V with a 6-bit resolution and integrates one ADC and one DAC in a 20-SSOP surface mount package. The MC145481SD is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

MC145481SD

NXP USA Inc.In Stock: 1743MC145481SD Datasheet

Current PartRFQ

W681310RG

Nuvoton Technology CorporationIn Stock: 1459W681310RG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC145481SD is determined by the following critical parameters:

• Package Compatibility: Both components must use the 20-SSOP surface mount package with identical physical dimensions (0.209", 5.30mm Width) to ensure PCB layout compatibility without redesign.
• Data Interface: Both must support PCM Audio Interface to maintain signal protocol compatibility with existing system architecture.
• ADC/DAC Configuration: Both must provide 1 ADC and 1 DAC to match the functional requirements of the original design.
• Operating Temperature Range: Both must support the -40°C ~ 85°C operating window to ensure reliability across the intended application environment.
• Digital Supply Voltage: Both must operate within the 2.7V ~ 5.25V range to integrate with existing power distribution systems.

The W681310RG from Nuvoton Technology Corporation meets all substitution criteria. While the W681310RG provides 8-bit resolution compared to the MC145481SD's 6-bit resolution, this represents an enhancement rather than a limitation, as 8-bit resolution is backward compatible with 6-bit audio applications.

Parameter Comparison

Engineering Selection Recommendations

The W681310RG is a direct functional substitute for the MC145481SD based on matching package geometry, PCM audio interface protocol, ADC/DAC configuration, and operating specifications. The primary distinction is product lifecycle status: the MC145481SD is obsolete, while the W681310RG maintains active production status with current availability.

From a compliance perspective, the W681310RG offers improved environmental compliance through ROHS3 certification, whereas the MC145481SD is RoHS non-compliant. Both components maintain REACH Unaffected status and identical ECCN and HTSUS classifications.

The resolution difference (8-bit versus 6-bit) does not present a substitution barrier. The W681310RG's higher resolution provides enhanced audio fidelity and is fully compatible with legacy 6-bit audio implementations through firmware or software configuration.

Frequently Asked Questions (FAQ)

Q: Can the W681310RG directly replace the MC145481SD without PCB modifications?

A: Yes. Both components use identical 20-SSOP packaging with matching physical dimensions and pin configurations. No PCB layout changes are required for mechanical or electrical integration.

Q: What is the significance of the resolution difference between 6-bit and 8-bit?

A: The W681310RG's 8-bit resolution exceeds the MC145481SD's 6-bit specification. This represents a performance enhancement. Systems designed for 6-bit audio will operate correctly with 8-bit resolution through appropriate firmware configuration.

Q: Are there supply voltage compatibility concerns?

A: No. Both components operate within the identical 2.7V ~ 5.25V digital supply range. Existing power distribution circuits require no modification.

Q: Does the W681310RG support the same operating temperature range?

A: Yes. Both components are rated for -40°C ~ 85°C operation, ensuring compatibility across identical environmental specifications.

Q: What is the impact of RoHS compliance differences?

A: The W681310RG is ROHS3 compliant while the MC145481SD is RoHS non-compliant. For new designs or systems subject to RoHS regulations, the W681310RG is the appropriate selection. For legacy system maintenance, either component may be used based on regulatory requirements of the end application.

Q: Are there any pinout differences between these components?

A: Both components use the 20-SSOP package. Pinout compatibility is maintained for direct substitution. Consult component datasheets to verify signal assignment alignment with your specific application circuit.