CS4399-CNZ Equivalent & Substitute Parts

Part Overview

The CS4399-CNZ is a 32-bit audio digital-to-analog converter (DAC) manufactured by Cirrus Logic Inc., designed for high-resolution audio applications supporting DSD and PCM data formats at sampling rates up to 384 kHz. The device is packaged in a 40-pin WFQFN with exposed pad and operates with dual supply voltages (1.66V to 1.94V for both analog and digital domains).

The CS4399-CNZ is classified as obsolete. Equivalent substitute parts are available from Cirrus Logic's active product portfolio, offering compatible electrical and mechanical specifications for direct replacement in existing designs.

Key Parameters

Parameter	CS4399-CNZ
Manufacturer	Cirrus Logic Inc.
Product Status	Obsolete
Resolution (Bits)	32
Number of Channels	2
Sampling Rate (Per Second)	384k
Data Interface	DSD, PCM
Voltage - Supply (Analog)	1.66V ~ 1.94V
Voltage - Supply (Digital)	1.66V ~ 1.94V
Operating Temperature	-10°C ~ 70°C
Package / Case	40-WFQFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the CS4399-CNZ are qualified based on the following critical parameters:

32-bit resolution matching the original specification
2-channel DAC configuration
40-pin WFQFN package with exposed pad (identical mechanical footprint)
Dual supply voltage range (1.66V ~ 1.94V for analog and digital)
Operating temperature range (-10°C ~ 70°C)
Surface mount technology
ROHS3 compliance and MSL 3 rating

The substitute parts CS43131-CNZ and CS43198-CNZ meet these core electrical and mechanical requirements. Both devices are manufactured by Cirrus Logic Inc. and maintain active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	CS4399-CNZ	CS43131-CNZ	CS43198-CNZ
Manufacturer	Cirrus Logic Inc.	Cirrus Logic Inc.	Cirrus Logic Inc.
Product Status	Obsolete	Active	Active
Number of Bits	32	32	32
Number of D/A Converters	2	2	2
Output Type	Voltage - Unbuffered	Voltage - Unbuffered	Voltage - Unbuffered
Data Interface	DSD, PCM	I2S	I2S
Voltage - Supply, Analog	1.66V ~ 1.94V	1.66V ~ 1.94V	1.66V ~ 1.94V
Voltage - Supply, Digital	1.66V ~ 1.94V	1.66V ~ 1.94V	1.66V ~ 1.94V
Architecture	Sigma-Delta	Sigma-Delta	Sigma-Delta
Operating Temperature	-10°C ~ 70°C	-10°C ~ 70°C	-10°C ~ 70°C
Package / Case	40-WFQFN Exposed Pad	40-WFQFN Exposed Pad	40-WFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Both CS43131-CNZ and CS43198-CNZ are qualified substitutes for the obsolete CS4399-CNZ based on matching electrical specifications, identical package geometry, and equivalent compliance certifications (ROHS3, REACH Unaffected, EAR99 classification).

The CS43131-CNZ provides a direct functional replacement with single-ended output configuration. The CS43198-CNZ offers extended functionality with differential output capability and flexible reference options (external or internal), providing additional design flexibility for applications requiring differential signaling.

Both substitute parts maintain active product status with Cirrus Logic Inc., ensuring continued availability, technical support, and supply chain reliability. Selection between the two substitutes should be based on specific application requirements regarding output configuration and reference implementation.

Frequently Asked Questions (FAQ)

Q: Can CS43131-CNZ or CS43198-CNZ be used as direct replacements for CS4399-CNZ?

A: Both parts are mechanically and electrically compatible substitutes. They share identical package geometry (40-WFQFN), matching supply voltage ranges, operating temperature specifications, and compliance certifications. PCB layout and footprint remain unchanged.

Q: What is the primary difference between CS43131-CNZ and CS43198-CNZ?

A: The CS43198-CNZ includes differential output capability and supports both external and internal reference configurations, while the CS43131-CNZ provides single-ended voltage output with internal reference only. Both maintain identical 32-bit resolution, 2-channel configuration, and package specifications.

Q: Why is the CS4399-CNZ classified as obsolete?

A: The CS4399-CNZ has been discontinued by Cirrus Logic Inc. The CS43131-CNZ and CS43198-CNZ represent the active product line replacements, offering equivalent or enhanced functionality with guaranteed long-term availability.

Q: Are there any differences in data interface compatibility?

A: The CS4399-CNZ supports both DSD and PCM data interfaces. The substitute parts (CS43131-CNZ and CS43198-CNZ) operate with I2S data interface. Design integration requires verification that the host system can provide I2S-formatted audio data.

Q: Do the substitute parts require any PCB layout modifications?

A: No. Both CS43131-CNZ and CS43198-CNZ use the identical 40-WFQFN package with exposed pad. Existing PCB layouts designed for CS4399-CNZ require no modifications for mechanical compatibility.

Q: Are moisture sensitivity and handling requirements the same?

A: Yes. All three parts (CS4399-CNZ, CS43131-CNZ, and CS43198-CNZ) carry MSL 3 rating with 168-hour floor life. Identical moisture control and storage procedures apply.

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