CS8420-CSZ Equivalent & Substitute Parts

Part Overview

The CS8420-CSZ is a 2-channel audio sample rate converter manufactured by Cirrus Logic Inc., housed in a 28-SOIC surface mount package. This device interfaces via I2C and SPI protocols and operates within the 4.75V to 5.25V supply voltage range, supporting sample rates from 8kHz to 108kHz. The CS8420-CSZ is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

CS8420-CSZ

Cirrus Logic Inc.In Stock: 2023CS8420-CSZ Datasheet

Current PartRFQ

SRC4382IPFB

Texas InstrumentsIn Stock: 1720SRC4382IPFB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS8420-CSZ is determined by the following critical parameters:

• Functional Equivalence: Both devices must perform 2-channel audio sample rate conversion
• Interface Compatibility: Both must support I2C and SPI communication protocols
• Channel Count: Equivalent parts must provide 2-channel functionality
• Package Compatibility: Physical dimensions and pin configuration must accommodate existing PCB layouts or allow for controlled redesign
• Supply Voltage Range: Operating voltage must be compatible with system power architecture
• Sample Rate Capability: Substitute must support the required frequency range for the application
• Product Availability: Active status preferred for long-term supply chain reliability

The SRC4382IPFB from Texas Instruments meets these substitution criteria as a 2-channel audio sample rate converter with I2C and SPI interface support, active product status, and extended sample rate capability.

Parameter Comparison

Engineering Selection Recommendations

The SRC4382IPFB is suitable as a substitute for the CS8420-CSZ based on the following factors:

Functional Alignment: Both devices provide 2-channel audio sample rate conversion with identical I2C and SPI interface support, meeting core application requirements.

Product Status: The SRC4382IPFB maintains active product status with Texas Instruments, ensuring long-term availability and supply chain continuity compared to the obsolete CS8420-CSZ.

Compliance & Certifications: The SRC4382IPFB carries ROHS3 compliance and improved moisture sensitivity rating (MSL 2 versus MSL 3), providing enhanced environmental robustness and regulatory alignment.

Performance Envelope: The SRC4382IPFB extends sample rate capability to 216kHz and operating temperature range to -40°C ~ 85°C, offering broader application flexibility.

Design Considerations: The package transition from 28-SOIC to 48-TQFP requires PCB layout modification. The supply voltage range differs (3V ~ 3.6V versus 4.75V ~ 5.25V), necessitating power supply architecture review.

Frequently Asked Questions (FAQ)

Q: Can the SRC4382IPFB directly replace the CS8420-CSZ without PCB modifications?

A: No. The package change from 28-SOIC to 48-TQFP (7x7) requires PCB layout redesign. Pin-to-pin compatibility is not guaranteed, and footprint changes are necessary.

Q: What is the primary reason for substitution?

A: The CS8420-CSZ is obsolete. The SRC4382IPFB provides equivalent 2-channel sample rate conversion functionality with active product status and improved compliance certifications.

Q: Are the interface protocols identical?

A: Yes. Both devices support I2C and SPI communication protocols, ensuring control interface compatibility at the firmware level.

Q: How do the supply voltage ranges differ?

A: The CS8420-CSZ operates at 4.75V ~ 5.25V, while the SRC4382IPFB operates at 3V ~ 3.6V. System power architecture must be evaluated to accommodate this difference.

Q: Does the SRC4382IPFB support the same sample rate range?

A: No. The SRC4382IPFB supports 4kHz ~ 216kHz, exceeding the CS8420-CSZ range of 8kHz ~ 108kHz. This provides extended capability for higher-resolution audio applications.

Q: What is the moisture sensitivity impact?

A: The SRC4382IPFB has MSL 2 (1 Year) compared to the CS8420-CSZ MSL 3 (168 Hours), indicating improved moisture tolerance and reduced handling constraints during assembly and storage.

Q: Is the operating temperature range compatible?

A: The SRC4382IPFB extends the operating range to -40°C ~ 85°C versus the CS8420-CSZ range of -10°C ~ 70°C, supporting broader environmental applications.