PCM69AU/2K Equivalent & Substitute Parts

Part Overview

The PCM69AU/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 operates with a 5V supply and supports PCM data interface for stereo audio applications across the -25°C to 85°C temperature range. The PCM69AU/2K is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PCM69AU/2K

Texas InstrumentsIn Stock: 7099PCM69AU/2K Datasheet

Current PartRFQ

PCM1793DB

Texas InstrumentsIn Stock: 2243PCM1793DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Channel Configuration: Both the main part and substitute maintain 2-channel stereo output capability
• Operating Temperature Range: Compatibility maintained at -25°C ~ 85°C
• Supply Voltage Compatibility: The substitute supports both 3V–3.6V and 5V operation, encompassing the PCM69AU/2K's 5V requirement
• Mounting Technology: Both components use surface mount technology, enabling direct PCB layout adaptation
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring environmental and regulatory alignment
• Data Interface: While the PCM69AU/2K uses PCM interface and the substitute uses I2S interface, both are serial audio data protocols compatible with appropriate firmware or hardware adaptation

The PCM1793DB represents the manufacturer-recommended successor, offering enhanced resolution (24-bit versus 18-bit) and higher sampling rate capability (200 kHz) within a compatible operational envelope.

Parameter Comparison

Engineering Selection Recommendations

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

• Product Status Alignment: The PCM1793DB maintains active product status, ensuring continued availability, technical support, and manufacturing consistency
• Regulatory Compliance: Both components maintain identical ROHS3 compliance and REACH unaffected status, eliminating regulatory substitution barriers
• Thermal Compatibility: Identical operating temperature range (-25°C ~ 85°C) ensures thermal performance equivalence across system operating conditions
• Supply Voltage Coverage: The PCM1793DB's dual voltage support (3V–3.6V and 5V) encompasses the PCM69AU/2K's 5V requirement with additional flexibility for lower-voltage applications
• Moisture Sensitivity: Both components share MSL rating 1 (unlimited), indicating equivalent moisture handling and storage requirements

Implementation of the PCM1793DB requires accommodation of package geometry differences (28-SSOP versus 20-SOIC) and data interface protocol adaptation (I2S versus PCM), necessitating PCB layout revision and firmware interface modification.

Frequently Asked Questions (FAQ)

Q: Can the PCM1793DB directly replace the PCM69AU/2K without PCB modification?

A: No. The PCM1793DB uses a 28-SSOP package compared to the PCM69AU/2K's 20-SOIC package. PCB layout redesign is required to accommodate the different pin count (28 versus 20) and package footprint dimensions.

Q: What is the primary difference in data interface between these components?

A: The PCM69AU/2K uses PCM (Pulse Code Modulation) serial interface, while the PCM1793DB uses I2S (Integrated Interchip Sound) interface. Both are serial audio protocols; however, system firmware or hardware interface logic must be adapted to support the I2S protocol.

Q: Are the operating temperature ranges compatible?

A: Yes. Both components operate across the identical temperature range of -25°C to 85°C, ensuring thermal performance equivalence in equivalent system environments.

Q: Does the PCM1793DB support 5V operation like the PCM69AU/2K?

A: Yes. The PCM1793DB supports both 3V–3.6V and 5V supply voltages, providing full compatibility with the PCM69AU/2K's 5V requirement while offering additional flexibility for lower-voltage designs.

Q: What are the resolution differences, and does this affect substitution?

A: The PCM69AU/2K provides 18-bit resolution, while the PCM1793DB provides 24-bit resolution. The higher resolution of the substitute represents an enhancement rather than a limitation, supporting improved audio fidelity without backward compatibility concerns.

Q: Are moisture sensitivity and storage requirements the same?

A: Yes. Both components carry MSL rating 1 (unlimited), indicating identical moisture sensitivity levels and equivalent storage and handling requirements.

Q: Is the PCM1793DB currently available?

A: Yes. The PCM1793DB maintains active product status with documented inventory availability, ensuring reliable sourcing for new designs and system updates.