LM1972M Audio Volume Control IC - Equivalent & Substitute Parts

Part Overview

The LM1972M is a 2-channel audio volume control integrated circuit manufactured by Texas Instruments, housed in a 20-SOIC surface mount package. This component functions as a digitally controlled potentiometer for consumer and professional audio applications, offering 78dB of attenuation range via SPI interface control.

The LM1972M is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product serviceability where original components are no longer readily available through standard distribution channels.

Substiute Parts

LM1972M

Texas InstrumentsIn Stock: 5217LM1972M Datasheet

Current PartRFQ

LM1972M/NOPB

National SemiconductorIn Stock: 6794LM1972M/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM1972M is determined by strict equivalence across the following critical parameters:

• Functional equivalence: 2-channel volume control with SPI digital interface
• Electrical compatibility: 4.5V to 12V supply voltage range and 0°C to 70°C operating temperature
• Performance specification: 78dB attenuation capability
• Package compatibility: 20-SOIC surface mount form factor with identical pinout and mechanical dimensions

The LM1972M/NOPB qualifies as a direct substitute based on complete alignment with all specified parameters. This part maintains identical electrical characteristics, functional behavior, and physical packaging while offering improved product status and compliance posture.

Parameter Comparison

Engineering Selection Recommendations

The LM1972M/NOPB is a direct functional and electrical equivalent to the LM1972M. Both parts share identical electrical specifications, channel configuration, interface protocol, and package geometry.

The LM1972M/NOPB offers two significant advantages for new designs and ongoing production:

• Product Status: Active product status ensures continued availability and manufacturer support, eliminating obsolescence risk associated with the original LM1972M.
• Compliance: ROHS3 compliance status meets current regulatory requirements for electronic component manufacturing and distribution in regulated markets.

Both parts maintain REACH Unaffected and EAR99 ECCN classifications. Selection between these parts should be based on supply chain requirements, regulatory compliance mandates, and long-term product lifecycle planning.

Frequently Asked Questions (FAQ)

Q: Can the LM1972M/NOPB be used as a direct replacement for the LM1972M in existing designs?

A: Yes. The LM1972M/NOPB is electrically and mechanically equivalent. Both parts feature identical SPI interface, 2-channel configuration, 78dB attenuation range, 4.5V to 12V supply voltage, and 20-SOIC package geometry. No circuit modifications are required.

Q: What is the difference between LM1972M and LM1972M/NOPB?

A: The primary differences are product status and RoHS compliance. The LM1972M is obsolete and RoHS non-compliant. The LM1972M/NOPB is an active product with ROHS3 compliance. Electrical and functional specifications are identical.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 20-SOIC package with 0.295" width and 7.50mm body dimension. Pinout and mechanical dimensions are identical, enabling direct PCB substitution.

Q: Which part should be selected for new product designs?

A: The LM1972M/NOPB is recommended for new designs due to active product status, ensuring long-term availability and manufacturer support. ROHS3 compliance also satisfies current regulatory requirements.

Q: Is the LM1972M/NOPB suitable for consumer and professional audio applications?

A: Yes. Both parts are specified for consumer audio and professional audio applications with identical performance characteristics and operating parameters.