PCM1691DCA Equivalent & Substitute Parts

Part Overview

The PCM1691DCA is a 24-bit audio digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for high-resolution audio applications with support for sampling rates up to 192 kHz. The device integrates 8 channels with DSP and I2S data interface capabilities, operating across dual supply voltages (3V–3.6V and 5V).

The PCM1691DCA is classified as obsolete, which necessitates identification of active equivalent components to maintain design continuity and ensure long-term supply chain reliability. Substitute parts must maintain identical electrical specifications, package compatibility, and functional performance to ensure direct replacement without circuit redesign.

Substiute Parts

PCM1691DCA

Texas InstrumentsIn Stock: 2372PCM1691DCA Datasheet

Current PartRFQ

PCM1690DCAR

Texas InstrumentsIn Stock: 34093PCM1690DCAR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCM1691DCA is determined by strict equivalence across the following critical parameters:

• Channel Configuration: 8-channel architecture
• Resolution & Sampling Rate: 24-bit resolution at 192 kHz sampling rate
• Data Interface: DSP and I2S protocol support
• Supply Voltage: Dual supply operation (3V–3.6V and 5V)
• Package & Pinout: 48-PowerTFSOP form factor with identical pin configuration
• Environmental Specifications: Operating temperature range −40°C to +85°C
• Compliance: ROHS3 compliance and MSL 3 rating

The PCM1690DCAR meets all these criteria and is designated as the manufacturer-recommended substitute. This part maintains complete functional and electrical equivalence while offering the advantage of active product status and automotive-grade qualification.

Parameter Comparison

Engineering Selection Recommendations

The PCM1690DCAR is the direct equivalent substitute for the PCM1691DCA. Selection of this substitute is justified on the following grounds:

Product Status: The PCM1691DCA is obsolete, creating supply chain risk. The PCM1690DCAR maintains active product status with significantly higher inventory availability (33,994 units versus 2,320 units), ensuring sustained procurement capability.

Functional Equivalence: All critical electrical and mechanical parameters are identical, including channel count, resolution, sampling rate, data interface, supply voltage, operating temperature range, package type, and pinout configuration. Direct PCB-level substitution is possible without circuit modification.

Compliance & Certification: Both parts maintain ROHS3 compliance and identical MSL 3 ratings. The PCM1690DCAR additionally carries automotive-grade qualification (AEC-Q100), which provides enhanced reliability assurance for applications requiring extended operational durability.

Supply Chain Continuity: Transition to the PCM1690DCAR eliminates obsolescence risk while maintaining design performance specifications.

Frequently Asked Questions (FAQ)

Q: Can the PCM1690DCAR be used as a direct replacement for the PCM1691DCA without PCB modifications?

A: Yes. The PCM1690DCAR is electrically and mechanically equivalent. Identical pinout, package type (48-PowerTFSOP), and all functional specifications enable direct substitution without circuit redesign or PCB layout changes.

Q: What is the primary difference between these two parts?

A: The PCM1691DCA is obsolete, while the PCM1690DCAR is an active product with automotive-grade qualification (AEC-Q100). All electrical and functional specifications are identical.

Q: Are there any supply voltage or operating temperature differences?

A: No. Both parts operate across identical supply voltage ranges (3V–3.6V and 5V) and identical temperature ranges (−40°C to +85°C).

Q: Does the automotive qualification of the PCM1690DCAR affect its use in non-automotive applications?

A: No. Automotive qualification represents an additional quality assurance level and does not restrict use in other applications. The part is fully compatible with all applications designed for the PCM1691DCA.

Q: Are the data interface protocols identical?

A: Yes. Both parts support DSP and I2S data interfaces with identical protocol implementation and pin configuration.

Q: What is the MSL rating, and does it differ between these parts?

A: Both parts carry MSL 3 rating (168 hours maximum floor life). Moisture sensitivity handling requirements are identical.

Q: Is inventory availability a consideration for this substitution?

A: Yes. The PCM1690DCAR has substantially higher inventory availability (33,994 units), providing improved supply chain reliability compared to the obsolete PCM1691DCA (2,320 units).