PCM69AU-J/2K Equivalent & Substitute Parts

Part Overview

The PCM69AU-J/2K is an 18-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, housed in a 20-SOIC surface mount package. This component is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations. The part operates with dual analog and digital supply voltages at 5V and supports PCM data interface protocols across a temperature range of -25°C to 85°C.

Key Parameters

Parameter	PCM69AU-J/2K
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	DAC, Audio
Number of Channels	2
Resolution (Bits)	18 b
Data Interface	PCM
Voltage Supply	5V
Operating Temperature	-25°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PCM69AU-J/2K is determined by the following critical parameters:

Functional Category: Audio DAC with 2-channel output capability
Resolution Compatibility: Minimum 18-bit resolution; higher resolution acceptable
Data Interface: PCM protocol support; alternative protocols acceptable if system firmware supports reconfiguration
Supply Voltage: 5V operation or multi-voltage support including 5V
Temperature Range: Minimum -25°C to 85°C operational window
Mounting Type: Surface mount technology
Compliance: ROHS3 compliance and EAR99 classification maintained

The PCM1793DB qualifies as a manufacturer-recommended substitute based on these criteria, despite differences in package form factor and enhanced specifications.

Parameter Comparison

Parameter	PCM69AU-J/2K	PCM1793DB	Compatibility Notes
Manufacturer	Texas Instruments	Texas Instruments	Same manufacturer ensures design continuity
Product Status	Obsolete	Active	Substitute is actively manufactured
Type	DAC, Audio	DAC, Audio	Identical functional category
Number of Channels	2	2	Channel count matches
Resolution (Bits)	18 b	24 b	Substitute provides enhanced resolution
Data Interface	PCM	I2S	Different protocols; requires interface verification
Voltage Supply	5V	3V ~ 3.6V, 5V	Substitute supports 5V operation plus additional voltage options
Operating Temperature	-25°C ~ 85°C	-25°C ~ 85°C	Temperature range identical
Mounting Type	Surface Mount	Surface Mount	Both surface mount compatible
Package / Case	20-SOIC (0.295", 7.50mm Width)	28-SSOP (0.209", 5.30mm Width)	Different package; PCB layout modification required
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet regulatory requirements
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical moisture sensitivity classification

Engineering Selection Recommendations

The PCM1793DB is designated as the manufacturer-recommended substitute for the obsolete PCM69AU-J/2K. Selection of this alternative is supported by:

Regulatory Compliance: Both components maintain ROHS3 compliance and EAR99 classification
Supply Voltage Compatibility: The PCM1793DB supports 5V operation, matching the original part's supply requirement
Temperature Range: Identical operating temperature specification ensures thermal compatibility
Active Production Status: The PCM1793DB is actively manufactured, ensuring long-term availability and supply chain stability
Manufacturer Continuity: Both components are produced by Texas Instruments, maintaining design ecosystem consistency

Implementation of the PCM1793DB requires evaluation of the following factors:

Data Interface Protocol: The shift from PCM to I2S interface necessitates verification of system firmware and signal processing compatibility
Package Transition: Migration from 20-SOIC to 28-SSOP requires PCB layout redesign and footprint modification
Resolution Enhancement: The increase from 18-bit to 24-bit resolution provides improved audio fidelity but may require firmware adjustment for data handling

Frequently Asked Questions (FAQ)

Q: Can the PCM1793DB directly replace the PCM69AU-J/2K without PCB modifications?

A: No. The PCM1793DB uses a 28-SSOP package compared to the 20-SOIC package of the original part. PCB layout redesign is required. Additionally, the data interface differs (I2S versus PCM), requiring interface verification.

Q: What is the primary reason for substitution?

A: The PCM69AU-J/2K is classified as obsolete. The PCM1793DB is an active, manufacturer-recommended alternative that maintains functional audio DAC capability with enhanced specifications.

Q: Are there voltage supply compatibility concerns?

A: No. The PCM1793DB supports 5V operation, matching the original part's supply voltage requirement. The substitute additionally supports 3V to 3.6V operation, providing design flexibility.

Q: Does the resolution increase from 18-bit to 24-bit affect compatibility?

A: Higher resolution is generally compatible with systems designed for lower resolution, provided the data interface protocol is supported. However, firmware verification is necessary to confirm proper data handling of the increased bit depth.

Q: What is the impact of the data interface change from PCM to I2S?

A: The data interface protocol change requires system-level verification. I2S is a widely supported audio interface standard. Compatibility depends on whether the receiving system can be configured to accept I2S protocol or if firmware modifications are necessary.

Q: Are both components RoHS compliant?

A: Yes. Both the PCM69AU-J/2K and PCM1793DB are ROHS3 compliant and maintain identical moisture sensitivity level (MSL) ratings of 1 (Unlimited).

Q: What is the inventory status of the substitute part?

A: The PCM1793DB has 2220 pieces in stock as new original inventory, ensuring immediate availability for procurement and implementation.

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