LM4670SD Equivalent & Substitute Parts

Part Overview

The LM4670SD is a Class D audio amplifier integrated circuit manufactured by Texas Instruments, designed for mono audio applications with 3W output power at 4Ω load impedance. This device operates across a 2.4V to 5.5V supply voltage range and is housed in an 8-WSON (3x3) surface mount package. The LM4670SD is classified as an obsolete product, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity.

Substiute Parts

LM4670SD

Texas InstrumentsIn Stock: 18742LM4670SD Datasheet

Current PartRFQ

LM4670SD/NOPB

Texas InstrumentsIn Stock: 1792LM4670SD/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4670SD is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Class D amplifier topology
• 1-Channel (Mono) output configuration
• 3W maximum output power at 4Ω load
• 2.4V to 5.5V supply voltage range
• Identical feature set: Depop, Differential Inputs, Short-Circuit Protection, Shutdown

Mechanical Specifications:

• 8-WFDFN Exposed Pad package
• Surface mount mounting type
• 8-WSON (3x3) footprint compatibility

Environmental Specifications:

• Operating temperature range: -40°C to 85°C

Only components matching all these parameters across electrical, mechanical, and environmental criteria are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

LM4670SD/NOPB is the direct functional equivalent to the LM4670SD. Both components share identical electrical specifications, mechanical packaging, and environmental operating parameters. The primary distinction between these parts is product status and regulatory compliance:

The LM4670SD is classified as obsolete, while the LM4670SD/NOPB maintains active product status from Texas Instruments. The LM4670SD/NOPB additionally carries ROHS3 compliance certification, whereas the original LM4670SD is RoHS non-compliant. Both components are REACH Unaffected and carry identical ECCN and HTSUS classifications.

For new designs or procurement requiring ongoing component availability, the LM4670SD/NOPB is the appropriate selection. The packaging format difference (Tape & Reel for LM4670SD/NOPB versus bulk for LM4670SD) reflects standard distribution practices and does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM4670SD/NOPB be used as a direct replacement for LM4670SD in existing designs?

A: Yes. The LM4670SD/NOPB is electrically and mechanically identical to the LM4670SD. Both components feature identical Class D amplifier topology, 3W output power at 4Ω, supply voltage range of 2.4V to 5.5V, and 8-WFDFN package footprint. No circuit modifications are required for substitution.

Q: What is the significance of the "/NOPB" suffix in LM4670SD/NOPB?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, reflecting RoHS3 compliance. This designation distinguishes the part from legacy versions and confirms adherence to current environmental regulations.

Q: Are there differences in thermal or electrical performance between LM4670SD and LM4670SD/NOPB?

A: No. Both parts operate identically across all specified electrical parameters, including output power, supply voltage range, operating temperature range (-40°C to 85°C), and integrated protection features (Depop, Differential Inputs, Short-Circuit Protection, Shutdown).

Q: What packaging formats are available for these parts?

A: The LM4670SD is supplied in bulk packaging, while the LM4670SD/NOPB is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes. Both formats contain identical components.

Q: Why is the LM4670SD classified as obsolete?

A: Product obsolescence reflects Texas Instruments' lifecycle management. The LM4670SD/NOPB remains in active production and is the recommended part for all new applications and ongoing procurement.

Q: Are there any compliance or certification differences between these parts?

A: The LM4670SD/NOPB carries ROHS3 compliance certification, while the LM4670SD is RoHS non-compliant. Both parts are REACH Unaffected. For applications subject to RoHS requirements, the LM4670SD/NOPB is the appropriate selection.