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CS8420-CSZR Equivalent & Substitute Parts
Part Overview
The CS8420-CSZR is a 2-channel audio sample rate converter manufactured by Cirrus Logic Inc., packaged in 28-SOIC surface mount configuration. This component is designed for digital audio interfacing applications, supporting sample rates from 8kHz to 108kHz with I2C and SPI interface options. The product is currently obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | CS8420-CSZR |
|---|---|
| Manufacturer | Cirrus Logic Inc. |
| Function | Sample Rate Converter |
| Number of Channels | 2 |
| Interface | I2C, SPI |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Operating Temperature | -10°C ~ 70°C |
| Sample Rate Range | 8kHz ~ 108kHz |
| Package Type | 28-SOIC |
| Product Status | Obsolete |
| Moisture Sensitivity Level | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the CS8420-CSZR is determined by the following critical parameters:
- Functional Equivalence: Both parts must perform 2-channel audio sample rate conversion with I2C and SPI interface support
- Channel Configuration: Substitute must maintain 2-channel architecture
- Interface Compatibility: I2C and SPI protocols must be supported
- Supply Voltage: Substitute operating voltage must be compatible with system design requirements
- Sample Rate Capability: Substitute must support the required frequency range for the application
- Package and Mounting: Surface mount technology with pin-compatible or functionally equivalent packaging
The SRC4382IPFBR from Texas Instruments meets these substitution criteria as an active, functionally equivalent 2-channel audio sample rate converter with I2C and SPI interfaces.
Parameter Comparison
| Parameter | CS8420-CSZR | SRC4382IPFBR | Compatibility Notes |
|---|---|---|---|
| Manufacturer | Cirrus Logic Inc. | Texas Instruments | Different manufacturer |
| Function | Sample Rate Converter | Sample Rate Converter | Functionally equivalent |
| Number of Channels | 2 | 2 | Matched |
| Interface | I2C, SPI | I2C, SPI | Matched |
| Voltage Supply Range | 4.75V ~ 5.25V | 3V ~ 3.6V | Different voltage requirements |
| Operating Temperature | -10°C ~ 70°C | -40°C ~ 85°C | SRC4382IPFBR has wider range |
| Sample Rate Range | 8kHz ~ 108kHz | 4kHz ~ 216kHz | SRC4382IPFBR supports extended range |
| Package Type | 28-SOIC | 48-TQFP (7x7) | Different package footprints |
| Product Status | Obsolete | Active | SRC4382IPFBR actively manufactured |
| Moisture Sensitivity Level | 3 (168 Hours) | 2 (1 Year) | SRC4382IPFBR has lower MSL |
| RoHS Status | Not specified | ROHS3 Compliant | SRC4382IPFBR meets RoHS3 |
Engineering Selection Recommendations
The SRC4382IPFBR is the designated manufacturer-recommended substitute for the obsolete CS8420-CSZR. Selection of this substitute requires consideration of the following factors based on provided specifications:
Voltage Supply Compatibility: The CS8420-CSZR operates at 4.75V ~ 5.25V, while the SRC4382IPFBR requires 3V ~ 3.6V. System power supply architecture must be evaluated to determine if dual voltage rails or voltage regulation is necessary.
Package Footprint Change: The transition from 28-SOIC to 48-TQFP (7x7) requires PCB layout redesign. Pin mapping and signal routing must be verified against device datasheets to ensure proper implementation.
Temperature Operating Range: The SRC4382IPFBR supports -40°C ~ 85°C compared to the original -10°C ~ 70°C range, providing extended environmental capability.
Sample Rate Capability: The SRC4382IPFBR supports 4kHz ~ 216kHz, exceeding the original 8kHz ~ 108kHz specification and providing additional frequency flexibility.
Compliance Status: The SRC4382IPFBR is ROHS3 compliant and carries lower moisture sensitivity (MSL 2), improving supply chain reliability and handling requirements compared to the obsolete part.
Frequently Asked Questions (FAQ)
Q: Can the SRC4382IPFBR directly replace the CS8420-CSZR without PCB modifications?
A: No. The package change from 28-SOIC to 48-TQFP (7x7) requires PCB layout redesign. Pin assignments must be verified against both device datasheets, and signal routing must be reconfigured for the new footprint.
Q: What is the primary limitation when substituting these parts?
A: The supply voltage requirement differs significantly. The CS8420-CSZR operates at 4.75V ~ 5.25V, while the SRC4382IPFBR requires 3V ~ 3.6V. System power architecture must accommodate this voltage difference through appropriate regulation or dual-rail design.
Q: Does the SRC4382IPFBR support the same interface protocols?
A: Yes. Both parts support I2C and SPI interfaces for control and configuration, maintaining protocol compatibility.
Q: Why is the SRC4382IPFBR recommended despite the package change?
A: The SRC4382IPFBR is actively manufactured by Texas Instruments, ensuring long-term availability. The CS8420-CSZR is obsolete, making new sourcing impossible. The substitute provides equivalent functionality with extended operating range and improved compliance status.
Q: Are there any moisture sensitivity considerations?
A: The SRC4382IPFBR has MSL 2 (1 Year) compared to the CS8420-CSZR MSL 3 (168 Hours), indicating improved moisture tolerance and reduced handling constraints during storage and assembly.
Q: What sample rate range does the SRC4382IPFBR support?
A: The SRC4382IPFBR supports 4kHz ~ 216kHz, which encompasses and exceeds the original CS8420-CSZR range of 8kHz ~ 108kHz.
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