PCM1702U Equivalent & Substitute Parts

Part Overview

The PCM1702U 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 with dual ±5V supply and is housed in a 20-SOIC surface mount package. The PCM1702U is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

PCM1702U

Texas InstrumentsIn Stock: 2869PCM1702U 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

Substitution of the PCM1702U is based on the following critical parameters that define functional compatibility:

Core Functional Parameters:

• Audio DAC device type with 2-channel configuration
• Serial data interface capability
• Operating temperature range compatibility (-25°C to 85°C)
• Surface mount technology
• RoHS3 compliance and REACH unaffected status

Allowable Parameter Variations:

• Resolution: PCM1702U operates at 20 bits; substitute parts may exceed this specification (32 bits acceptable)
• Sampling Rate: PCM1702U operates at 44.1 kHz; substitute parts must support this rate or higher (200 kHz acceptable)
• Data Interface: PCM1702U uses Serial; substitute parts supporting DSD and PCM protocols are compatible
• Voltage Supply: PCM1702U uses ±5V dual supply; substitute parts supporting multiple voltage ranges including 5V are compatible
• Package: Different surface mount packages are acceptable if pin-compatible or with appropriate board redesign

The PCM1795DB and PCM1795DBR are functionally superior alternatives that maintain backward compatibility through enhanced specifications while meeting all compliance and operational requirements.

Parameter Comparison

Engineering Selection Recommendations

PCM1795DB and PCM1795DBR Selection Basis:

Both PCM1795DB and PCM1795DBR are active, production-status components that directly address the obsolescence of the PCM1702U. Selection between these two substitute parts is determined by packaging and inventory requirements:

PCM1795DB is supplied in Tube packaging and maintains 2,100 units in stock inventory.

PCM1795DBR is supplied in Cut Tape (CT) & Digi-Reel® packaging and maintains 15,599 units in stock inventory.

Both parts are ROHS3 compliant and REACH unaffected, meeting all regulatory requirements equivalent to the original PCM1702U. The PCM1795 series offers improved specifications including 32-bit resolution, 200 kHz sampling rate capability, and support for both DSD and PCM data interfaces. Operating temperature range remains consistent at -25°C to 85°C.

The moisture sensitivity level improves from MSL 2 (1 Year) to MSL 1 (Unlimited), providing superior reliability in storage and handling. Supply voltage flexibility (3V to 3.6V and 5V) accommodates both legacy ±5V designs and modern lower-voltage applications.

Package transition from 20-SOIC to 28-SSOP requires PCB layout modification but maintains the same 5.30mm width dimension, facilitating design adaptation.

Frequently Asked Questions (FAQ)

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

A: The substitute parts require PCB layout changes due to package transition from 20-SOIC to 28-SSOP. Pin configuration differs between the original and substitute devices. Circuit redesign and validation are necessary.

Q: What are the key performance improvements in the PCM1795 series?

A: The PCM1795 series provides 32-bit resolution versus 20-bit, supports sampling rates up to 200 kHz versus 44.1 kHz, and offers dual data interface support (DSD and PCM) versus serial-only. These enhancements enable broader audio application compatibility.

Q: Are there voltage supply compatibility concerns?

A: The PCM1702U operates on ±5V dual supply. The PCM1795 series supports 3V to 3.6V and 5V supplies with separate analog and digital supply sources. Designs using ±5V supply can operate the substitute parts at 5V with appropriate circuit design.

Q: What is the difference between PCM1795DB and PCM1795DBR?

A: Both parts are electrically and functionally identical. The difference is packaging format: PCM1795DB uses Tube packaging with 2,100 units available, while PCM1795DBR uses Cut Tape & Digi-Reel® packaging with 15,599 units available. Selection depends on production volume and handling requirements.

Q: Does the improved moisture sensitivity level (MSL 1 vs MSL 2) affect handling procedures?

A: MSL 1 (Unlimited shelf life) provides superior storage stability compared to MSL 2 (1 Year). The substitute parts require less stringent moisture control during storage and handling, reducing production risk.

Q: Are regulatory certifications maintained with the substitute parts?

A: Yes. Both PCM1795DB and PCM1795DBR maintain ROHS3 compliance, REACH unaffected status, and identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications as the original PCM1702U.