PCM1606E/2K Equivalent & Substitute Parts

Part Overview

The PCM1606E/2K is a 24-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for audio applications requiring 6-channel output with a 200 kHz sampling rate and I2S data interface. The device operates from a single 5V supply and is housed in a 20-SSOP surface mount package.

This part has reached obsolete product status. Locating equivalent or substitute components is necessary to support ongoing system maintenance, design updates, or new production requirements where the original part is no longer available from primary sources.

Substiute Parts

PCM1606E/2K

Texas InstrumentsIn Stock: 2627PCM1606E/2K Datasheet

Current PartRFQ

PCM1681PWPR

Texas InstrumentsIn Stock: 25275PCM1681PWPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCM1606E/2K is determined by the following critical parameters:

• Resolution: 24-bit audio DAC capability
• Data Interface: I2S protocol support
• Sampling Rate: Minimum 200 kHz capability
• Regulatory Compliance: ROHS3 and REACH compliance status
• Manufacturer: Texas Instruments product line continuity

The PCM1681PWPR qualifies as a manufacturer-recommended substitute based on these core criteria. While the substitute introduces differences in channel count, supply voltage configuration, and package format, these variations are within acceptable engineering tolerances for audio DAC applications where the primary functional requirement is 24-bit audio conversion with I2S interface support.

Parameter Comparison

Engineering Selection Recommendations

The PCM1681PWPR is the manufacturer-recommended substitute for the obsolete PCM1606E/2K. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs or production transitions.

Key considerations for implementation:

• Supply Architecture: The PCM1681PWPR requires separate analog and digital supply voltages (3V–3.6V and 5V), whereas the original part operates from a single 5V supply. Power distribution design must be updated accordingly.

• Package Transition: The shift from 20-SSOP to 28-PowerTSSOP requires PCB layout redesign. The larger package footprint and increased pin count necessitate schematic and layout modifications.

• Sampling Rate: The PCM1681PWPR supports a maximum sampling rate of 192 kHz, which is lower than the original part's 200 kHz specification. Applications operating at or above 192 kHz will function within the substitute's rated capability; applications requiring exactly 200 kHz operation must be evaluated for compatibility.

• Channel Expansion: The substitute provides 8 channels instead of 6, offering additional functionality without reducing performance in the original application space.

• Moisture Handling: MSL 3 rating requires adherence to stricter moisture control protocols during component storage, handling, and assembly compared to the MSL 1 original part.

Frequently Asked Questions (FAQ)

Q: Can the PCM1681PWPR directly replace the PCM1606E/2K without design changes?

A: No. While both are 24-bit audio DACs with I2S support, the substitute requires modifications to power supply architecture, PCB layout, and schematic design due to differences in package type, pin count, and supply voltage configuration.

Q: What is the impact of the 192 kHz versus 200 kHz sampling rate difference?

A: The PCM1681PWPR's 192 kHz maximum sampling rate is lower than the original part's 200 kHz specification. Applications operating at 192 kHz or below will function normally. Applications requiring 200 kHz operation must be evaluated to determine if the lower rate is acceptable for the intended audio application.

Q: Why does the substitute have 8 channels instead of 6?

A: The PCM1681PWPR is a higher-integration device in the Texas Instruments audio DAC product line. The additional channels provide expanded functionality and do not negatively impact applications requiring only 6 channels; unused channels can remain unconnected or configured as needed.

Q: What are the implications of the different package types?

A: The original 20-SSOP package is replaced by the 28-PowerTSSOP package in the substitute. This requires complete PCB redesign, including new footprint layout, trace routing, and via placement. The PowerTSSOP package includes an exposed thermal pad for improved heat dissipation.

Q: How does the MSL 3 moisture sensitivity level affect component handling?

A: MSL 3 components require storage in controlled humidity environments (typically below 30% relative humidity) and have a limited floor life of 168 hours after moisture exposure. Compared to the original part's MSL 1 (unlimited floor life), stricter moisture control protocols must be implemented during storage, handling, and assembly processes.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the PCM1606E/2K and PCM1681PWPR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the availability status of each part?

A: The PCM1606E/2K is obsolete and no longer in active production. The PCM1681PWPR is in active production status with current inventory availability, making it the viable path forward for new designs or production transitions.