PCM1702U-J Equivalent & Substitute Parts

Part Overview

The PCM1702U-J is a 20-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for serial audio applications with a 44.1 kHz sampling rate. The device operates on dual ±5V supply and is housed in a 20-SOIC surface mount package. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements.

Substiute Parts

PCM1702U-J

Texas InstrumentsIn Stock: 740PCM1702U-J Datasheet

Current PartRFQ

PCM1795DB

Texas InstrumentsIn Stock: 2193PCM1795DB Datasheet

MFR RecommendedRFQ

PCM1795DBR

Texas InstrumentsIn Stock: 15616PCM1795DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCM1702U-J are identified based on functional equivalence within the audio DAC category. The primary substitutes—PCM1795DB and PCM1795DBR—share the following critical parameters with the main part:

• Manufacturer: Texas Instruments (same manufacturer ensures design continuity)
• Type: DAC, Audio (identical functional category)
• Number of Channels: 2 (matching channel configuration)
• Operating Temperature: -25°C ~ 85°C (identical operating range)
• Mounting Type: Surface Mount (compatible assembly process)
• RoHS Status: ROHS3 Compliant (equivalent environmental compliance)

The substitutes represent an upgrade path, offering enhanced specifications including 32-bit resolution (versus 20-bit), 200 kHz sampling rate (versus 44.1 kHz), and support for both DSD and PCM data interfaces. Both substitute parts are in active production status, addressing the obsolescence of the original component.

Parameter Comparison

Engineering Selection Recommendations

Selection between PCM1795DB and PCM1795DBR should be based on packaging and supply chain requirements rather than functional differences, as both parts are electrically identical.

PCM1795DB is supplied in tube packaging, suitable for lower-volume applications and manual assembly processes.

PCM1795DBR is supplied in cut tape and Digi-Reel format, optimized for high-volume automated assembly and reel-based pick-and-place operations. Current inventory for PCM1795DBR (15,599 pcs) significantly exceeds PCM1795DB (2,100 pcs), indicating superior availability for production schedules.

Both substitute parts carry active product status and ROHS3 compliance, ensuring long-term supply continuity and regulatory alignment. The improved moisture sensitivity rating (MSL 1 versus MSL 2) provides extended shelf life and reduced handling constraints during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can PCM1795DB or PCM1795DBR directly replace PCM1702U-J without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (20-SOIC versus 28-SSOP). Circuit redesign is required to accommodate the different pin configuration and package footprint. However, the functional audio DAC operation is compatible.

Q: What are the key differences in data interface capability?

A: The PCM1702U-J supports serial data interface only, while PCM1795DB and PCM1795DBR support both DSD and PCM data interfaces. Applications using serial PCM input will operate within the substitute parts' capabilities.

Q: How do the voltage supply requirements differ?

A: The PCM1702U-J requires dual ±5V supply. The PCM1795DB and PCM1795DBR require separate analog and digital supplies with voltage ranges of 3V to 3.6V and 5V. Power supply circuit redesign is necessary for substitution.

Q: What is the significance of the MSL rating difference?

A: PCM1702U-J carries MSL 2 (1 Year), while substitutes carry MSL 1 (Unlimited). This indicates the substitute parts have superior moisture resistance and extended shelf life, reducing storage and handling constraints.

Q: Which substitute part should be selected for high-volume production?

A: PCM1795DBR is recommended for high-volume automated assembly due to cut tape and Digi-Reel packaging format and significantly higher current inventory availability.