PCM1704U-J Equivalent & Substitute Parts

Part Overview

The PCM1704U-J is a 24-bit audio DAC (Digital-to-Analog Converter) manufactured by Texas Instruments, designed for high-resolution audio applications with a 96 kHz sampling rate and dual-channel output. The device operates on dual ±5V supply and is housed in a 20-SOIC surface mount package.

This part is classified as Obsolete, making it necessary to identify functionally compatible alternatives for new designs or production continuity. The PCM1704U-J remains available in inventory (1017 pcs), but obsolescence status requires evaluation of substitute components that meet or exceed the original specifications while maintaining design compatibility.

Substiute Parts

PCM1704U-J

Texas InstrumentsIn Stock: 1042PCM1704U-J Datasheet

Current PartRFQ

PCM1795DBR

Texas InstrumentsIn Stock: 15616PCM1795DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The PCM1795DBR qualifies as a substitute based on the following criteria:

Functional Compatibility Parameters:

• Both devices are dual-channel audio DACs with serial/PCM data interface capability
• Both support surface mount installation with compatible thermal and mechanical characteristics
• Both operate within the -25°C to 85°C temperature range
• Both maintain ROHS3 compliance and REACH unaffected status

Substitution Basis: The PCM1795DBR represents an enhanced specification alternative. While it increases resolution to 32 bits and sampling rate to 200 kHz, these represent upward-compatible improvements. The device maintains dual-channel audio DAC functionality and supports PCM data interface, ensuring compatibility with serial audio data streams. The shift from dual ±5V to flexible supply options (3V–3.6V and 5V) provides design flexibility for modern applications.

Key Differentiators:

• Resolution upgrade: 24-bit → 32-bit
• Sampling rate upgrade: 96 kHz → 200 kHz
• Data interface expansion: Serial → DSD and PCM support
• Supply voltage flexibility: Fixed dual ±5V → Configurable analog/digital supplies
• Package change: 20-SOIC → 28-SSOP (same 5.30mm width)
• Product status: Obsolete → Active

Parameter Comparison

Engineering Selection Recommendations

For Obsolescence Mitigation: The PCM1704U-J is classified as Obsolete. The PCM1795DBR is an Active product from the same manufacturer, ensuring long-term availability and supply chain stability. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current and future production.

For Design Continuity: The PCM1795DBR supports PCM data interface, maintaining compatibility with existing serial audio data streams. The expanded feature set (32-bit resolution, 200 kHz sampling rate, DSD support) does not compromise backward compatibility with applications designed for 24-bit, 96 kHz operation.

For Supply Chain Considerations: Current inventory of PCM1704U-J is available (1017 pcs). However, the Active status of PCM1795DBR with significantly higher inventory (15599 pcs) provides superior long-term procurement reliability. The improved moisture sensitivity rating (MSL 1 vs. MSL 2) reduces handling and storage risk.

Frequently Asked Questions (FAQ)

Q: Can the PCM1795DBR directly replace the PCM1704U-J in existing designs?

A: The PCM1795DBR is functionally compatible for audio DAC applications requiring serial PCM data interface. Both devices support dual-channel audio output and operate within the same temperature range. However, the package change from 20-SOIC to 28-SSOP requires PCB layout modification. The supply voltage flexibility of the PCM1795DBR (3V–3.6V and 5V options) may require power supply circuit adjustment from the fixed dual ±5V requirement of the PCM1704U-J.

Q: What are the key differences in electrical specifications?

A: The PCM1795DBR provides higher resolution (32-bit vs. 24-bit) and faster sampling rate (200 kHz vs. 96 kHz). It supports both DSD and PCM data interfaces, whereas the PCM1704U-J supports serial interface only. The PCM1795DBR offers configurable analog and digital supply voltages, providing design flexibility compared to the fixed dual ±5V supply of the PCM1704U-J.

Q: Are there package compatibility concerns?

A: Both devices use surface mount technology with the same 5.30mm width specification. The PCM1704U-J uses 20-SOIC packaging, while the PCM1795DBR uses 28-SSOP packaging. This difference requires PCB redesign for pin routing and thermal management. The increased pin count (28 vs. 20) accommodates additional functionality in the PCM1795DBR.

Q: Do both parts meet current compliance standards?

A: Both the PCM1704U-J and PCM1795DBR are ROHS3 compliant and REACH unaffected. The PCM1795DBR has an improved moisture sensitivity level (MSL 1 with unlimited shelf life vs. MSL 2 with 1-year shelf life), reducing storage and handling constraints.

Q: Which part should be selected for new designs?

A: The PCM1795DBR is recommended for new designs due to its Active product status, higher performance specifications, improved compliance ratings, and superior long-term availability. The PCM1704U-J should be reserved for legacy system maintenance where existing designs cannot accommodate package or supply voltage changes.