CS4340-CZZ Equivalent & Substitute Parts

Part Overview

The CS4340-CZZ 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. This component operates as a single-supply device across 2.7V to 3.6V and 5V supply ranges, housed in a 16-TSSOP surface mount package.

The CS4340-CZZ has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this audio DAC architecture.

Substiute Parts

CS4340-CZZ

Cirrus Logic Inc.In Stock: 1549CS4340-CZZ 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-CZZ is evaluated based on the following critical parameters that define functional and mechanical compatibility:

Core Functional Parameters:

• Audio DAC architecture with 24-bit resolution
• SPI digital interface protocol
• Dual-channel configuration
• Single-supply voltage operation

Performance Parameters:

• Sampling rate capability (96 kHz minimum requirement)
• Operating temperature range (−10°C to 70°C)
• Supply voltage compatibility (3V–3.47V and 5V operation)

Physical Parameters:

• Surface mount technology
• Package footprint and pin count

The CS4345-CZZ qualifies as a manufacturer-recommended substitute. While it introduces a higher sampling rate capability (192 kHz) and different package configuration (10-TSSOP versus 16-TSSOP), it maintains functional equivalence across the core parameters: 24-bit audio DAC architecture, SPI interface, dual-channel output, and compatible supply voltage ranges. The enhanced sampling rate represents a performance superset rather than a limitation.

Parameter Comparison

Engineering Selection Recommendations

CS4345-CZZ as Primary Substitute:

The CS4345-CZZ is the manufacturer-recommended substitute for the obsolete CS4340-CZZ. Selection of this part is supported by the following engineering factors:

• Product Status: CS4345-CZZ maintains Last Time Buy status, providing extended procurement window compared to the fully obsolete CS4340-CZZ.
• Compliance: CS4345-CZZ achieves ROHS3 compliance, whereas RoHS status for CS4340-CZZ is not specified.
• Moisture Sensitivity: CS4345-CZZ carries MSL 2 (1 Year), representing improved handling and storage characteristics relative to CS4340-CZZ MSL 3 (168 Hours).
• Functional Equivalence: Both devices maintain 24-bit resolution, dual-channel architecture, and SPI interface protocol.
• Supply Voltage: Both devices support 5V operation. Applications requiring 2.7V operation must confirm CS4345-CZZ compatibility, as its minimum specified voltage is 3V.

Design Consideration:

The CS4345-CZZ operates at 192 kHz sampling rate versus the CS4340-CZZ 96 kHz specification. This represents enhanced performance capability. PCB layout modifications are required due to different package footprints (10-TSSOP versus 16-TSSOP) and pin configurations.

Frequently Asked Questions (FAQ)

Q: Can CS4345-CZZ directly replace CS4340-CZZ without PCB modification?

A: No. The CS4345-CZZ uses a 10-TSSOP package with different pin count and footprint (0.118", 3.00mm width) compared to the CS4340-CZZ 16-TSSOP package (0.173", 4.40mm width). PCB layout redesign is required. Pin-to-pin compatibility must be verified against the respective datasheets.

Q: What is the minimum supply voltage for CS4345-CZZ?

A: The CS4345-CZZ minimum supply voltage is 3V. The CS4340-CZZ supports 2.7V minimum. Applications requiring 2.7V operation must confirm CS4345-CZZ functionality at this voltage level through the manufacturer datasheet or direct consultation with Cirrus Logic Inc.

Q: Why does CS4345-CZZ have a higher sampling rate than CS4340-CZZ?

A: The CS4345-CZZ is specified for 192 kHz sampling rate, while CS4340-CZZ operates at 96 kHz. This represents a performance enhancement in the substitute part. Applications designed for 96 kHz operation will function within the CS4345-CZZ capability envelope.

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

A: Last Time Buy indicates that Cirrus Logic Inc. has announced a final production run for CS4345-CZZ. After this period, the part will transition to obsolete status. Procurement planning should account for this timeline to secure adequate inventory for long-term production requirements.

Q: Are there compliance differences between these parts?

A: Yes. CS4345-CZZ is ROHS3 compliant, while RoHS status for CS4340-CZZ is not specified. CS4345-CZZ also carries lower moisture sensitivity (MSL 2 versus MSL 3), improving handling and storage requirements.

Q: What is the significance of different MSL ratings?

A: MSL (Moisture Sensitivity Level) 3 (168 Hours) for CS4340-CZZ requires baking and controlled humidity handling within 168 hours of package opening. MSL 2 (1 Year) for CS4345-CZZ allows extended shelf life and more flexible handling procedures, reducing manufacturing process constraints.