CS4340-KSZ Equivalent & Substitute Parts

Part Overview

The CS4340-KSZ is a 24-bit audio digital-to-analog converter (DAC) manufactured by Cirrus Logic Inc., designed for audio applications requiring 96 kHz sampling rate with SPI interface connectivity. The device operates from single supply voltages of 2.7V to 3.6V or 5V and is housed in a 16-SOIC surface mount package.

This part is classified as Obsolete, making it necessary to identify equivalent substitute components for new designs or ongoing production requirements. The CS4340-KSZ remains available with 2,350 pieces in current inventory as new original stock.

Substiute Parts

CS4340-KSZ

Cirrus Logic Inc.In Stock: 2411CS4340-KSZ Datasheet

Current PartRFQ

CS4345-CZZ

Cirrus Logic Inc.In Stock: 5141CS4345-CZZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS4340-KSZ is determined by the following critical parameters that must remain compatible with the original design:

Core Functional Parameters:

• Resolution: 24 bits (maintained across substitutes)
• Number of Channels: 2 (maintained across substitutes)
• Data Interface: SPI (maintained across substitutes)
• Supply Voltage Compatibility: Single supply operation at 5V (common operating point)
• Operating Temperature Range: -10°C to 70°C (maintained across substitutes)

Allowable Variations:

• Sampling Rate: The CS4340-KSZ operates at 96 kHz. Substitute parts may support higher sampling rates (up to 192 kHz) without creating incompatibility, as higher-capability devices remain backward compatible with lower sampling rate requirements.
• Package Type: Different surface mount packages are acceptable provided the pin configuration and electrical characteristics remain compatible with the application circuit.
• Product Status: Substitutes may have different lifecycle status (Last Time Buy vs. Obsolete) but must maintain current availability.

The CS4345-CZZ qualifies as a direct substitute based on these criteria, offering enhanced sampling rate capability while maintaining all core functional parameters and supply voltage compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement: The CS4340-KSZ is classified as Obsolete, indicating end-of-life status. The CS4345-CZZ is classified as Last Time Buy, representing a transitional lifecycle state with defined availability window. Selection of the CS4345-CZZ provides access to current inventory (5,071 pieces available) while the CS4340-KSZ inventory (2,350 pieces) will eventually deplete.

Compliance Considerations: The CS4345-CZZ carries ROHS3 Compliant certification, meeting current regulatory requirements for restricted substances. Both parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications, ensuring consistent regulatory treatment.

Package and Circuit Board Implications: The CS4345-CZZ uses a 10-TSSOP package (0.118", 3.00mm width) compared to the 16-SOIC package (0.154", 3.90mm width) of the CS4340-KSZ. This represents a reduction in package footprint and pin count. Circuit board redesign is required to accommodate the different package geometry and pin configuration.

Supply Voltage Operating Window: The CS4340-KSZ supports 2.7V to 3.6V operation, while the CS4345-CZZ operates from 3V to 3.47V. Both devices support 5V operation. Applications using the lower 2.7V to 3V range must verify compatibility with the CS4345-CZZ minimum specification of 3V.

Frequently Asked Questions (FAQ)

Q: Can the CS4345-CZZ directly replace the CS4340-KSZ without circuit modifications?

A: No. While both devices share identical core audio specifications (24-bit resolution, 2 channels, SPI interface, -10°C to 70°C operating range), the CS4345-CZZ uses a different package type (10-TSSOP vs. 16-SOIC) with different pin assignments. Circuit board layout and schematic modifications are required.

Q: What is the significance of the higher 192 kHz sampling rate in the CS4345-CZZ?

A: The CS4345-CZZ supports 192 kHz sampling rate compared to 96 kHz in the CS4340-KSZ. This represents enhanced capability that remains backward compatible with 96 kHz applications. Existing firmware and signal processing chains designed for 96 kHz operation will function correctly with the CS4345-CZZ.

Q: Are there supply voltage compatibility issues between these parts?

A: Both parts support 5V operation without restriction. For applications using supply voltages between 2.7V and 3V, the CS4340-KSZ is specified while the CS4345-CZZ minimum is 3V. Verify your application's actual supply voltage against the CS4345-CZZ specification of 3V to 3.47V for the lower voltage range.

Q: What does "Last Time Buy" status mean for the CS4345-CZZ?

A: Last Time Buy indicates a defined final ordering period before the manufacturer discontinues production. Inventory remains available during this window, but future availability is not guaranteed. Plan procurement accordingly if selecting the CS4345-CZZ for long-term production.

Q: Are both parts RoHS compliant?

A: The CS4345-CZZ is ROHS3 Compliant. The CS4340-KSZ RoHS status is not specified in available documentation. Both parts maintain identical REACH Unaffected status.

Q: What is the moisture sensitivity level for these components?

A: Both the CS4340-KSZ and CS4345-CZZ carry MSL 2 (1 Year) rating, indicating identical moisture handling and storage requirements.