PCM1718E/2K Equivalent & Substitute Parts

Part Overview

The PCM1718E/2K is an 18-bit audio DAC manufactured by Texas Instruments, designed for stereo audio applications with a 48 kHz sampling rate and I2S digital interface. This component operates across a wide supply voltage range of 2.7V to 5.5V and is housed in a 20-pin SSOP package. The product is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PCM1718E/2K

Texas InstrumentsIn Stock: 3160PCM1718E/2K Datasheet

Current PartRFQ

PCM1781DBQR

Texas InstrumentsIn Stock: 40140PCM1781DBQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCM1718E/2K is determined by the following critical parameters:

Functional Compatibility Criteria:

• Digital audio interface type (I2S)
• Stereo channel configuration (2 channels)
• Operating temperature range (-25°C ~ 85°C)
• Surface mount technology compatibility

Performance Considerations:

• Resolution upgrade from 18-bit to 24-bit
• Sampling rate increase from 48 kHz to 200 kHz
• Package size reduction from 20-SSOP to 16-SSOP
• Supply voltage change from dual-supply range (2.7V ~ 5.5V) to single 5V supply

The PCM1781DBQR qualifies as a substitute based on maintained I2S interface, dual-channel audio DAC architecture, and compatible operating temperature range. The substitute offers enhanced specifications including higher resolution and sampling rate capability, though it requires single 5V supply operation rather than the flexible voltage range of the original component.

Parameter Comparison

Engineering Selection Recommendations

The PCM1781DBQR is an active product from Texas Instruments and represents the primary substitute for the obsolete PCM1718E/2K. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system support.

Selection of the PCM1781DBQR requires verification of the following design parameters:

• Power supply architecture must accommodate single 5V operation instead of the flexible 2.7V to 5.5V range
• PCB layout must accommodate the smaller 16-SSOP package footprint (0.154" width versus 0.209" width)
• System firmware must support I2S interface configuration compatible with 24-bit resolution and 200 kHz sampling rate capability
• Thermal management design must account for any differences in power dissipation between the two components

Frequently Asked Questions (FAQ)

Q: Can the PCM1781DBQR directly replace the PCM1718E/2K without PCB modifications?

A: Direct replacement requires PCB layout changes due to package size difference (20-SSOP to 16-SSOP). Pin configuration and I2S signal compatibility must be verified against specific application schematics.

Q: What is the primary reason for substitution?

A: The PCM1718E/2K is classified as obsolete. The PCM1781DBQR is an active product offering enhanced specifications including 24-bit resolution, 200 kHz sampling rate, and smaller package footprint.

Q: Are there supply voltage compatibility concerns?

A: Yes. The PCM1718E/2K operates across 2.7V to 5.5V, while the PCM1781DBQR requires a fixed 5V supply. System power architecture must be evaluated to ensure single 5V supply availability.

Q: Do both components use the same digital interface?

A: Yes. Both components utilize I2S digital audio interface for stereo audio data transmission.

Q: What are the operating temperature specifications?

A: Both components operate across the identical temperature range of -25°C to 85°C.

Q: Are there regulatory compliance differences?

A: No. Both components maintain ROHS3 compliance, REACH unaffected status, and identical ECCN and HTSUS classifications.