LM4549BVH Audio Codec Equivalent & Substitute Parts

Part Overview

The LM4549BVH is a dual-channel audio codec IC manufactured by Texas Instruments, designed for AC '97 interface applications with 18-bit serial data resolution. This component integrates two analog-to-digital converters (ADCs) and two digital-to-analog converters (DACs) with Sigma-Delta modulation architecture, operating across dual voltage supplies for analog and digital domains.

The LM4549BVH carries an obsolete product status. Identifying functionally equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this audio codec architecture.

Substiute Parts

LM4549BVH

Texas InstrumentsIn Stock: 2388LM4549BVH Datasheet

Current PartRFQ

LM4549BVH/NOPB

Texas InstrumentsIn Stock: 1531LM4549BVH/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4549BVH is determined by strict equivalence across the following critical parameters:

• Audio codec architecture: AC '97 interface with serial data protocol
• Resolution: 18-bit conversion
• Converter configuration: 2 ADCs and 2 DACs
• Sigma-Delta modulation: Required
• Dynamic range specifications: ADC 90 dB, DAC 89 dB typical
• Voltage supply ranges: Analog 4.2V–5.5V, Digital 3.3V–5.5V
• Operating temperature range: -40°C to 85°C
• Package form factor: 48-LQFP (7x7 mm)
• Surface mount compatibility

The LM4549BVH/NOPB qualifies as a direct substitute based on identical electrical specifications, mechanical compatibility, and functional equivalence across all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The LM4549BVH is classified as obsolete. The LM4549BVH/NOPB is the direct substitute, carrying active product status from Texas Instruments. This substitute maintains identical electrical and mechanical specifications while offering improved supply chain availability.

The LM4549BVH/NOPB is RoHS3 compliant, whereas the original LM4549BVH is RoHS non-compliant. Both parts share identical REACH and ECCN classifications. The packaging difference (tray for the substitute versus unspecified for the original) does not affect functional compatibility in circuit applications.

Selection of the LM4549BVH/NOPB is supported by its active product status and regulatory compliance posture, making it the appropriate choice for new designs and ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can the LM4549BVH/NOPB be used as a direct replacement for the LM4549BVH?

A: Yes. Both parts share identical electrical specifications, including resolution, converter configuration, voltage supply ranges, operating temperature, and package form factor. The LM4549BVH/NOPB is functionally equivalent and mechanically compatible.

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

A: The "/NOPB" designation indicates lead-free, RoHS3-compliant packaging. This reflects the manufacturing process and environmental compliance standard applied to the component, not a change to electrical or functional characteristics.

Q: Are there packaging differences between these parts?

A: The LM4549BVH/NOPB is supplied in tray packaging, while the original LM4549BVH packaging is unspecified in the provided data. Both use the 48-LQFP (7x7 mm) surface mount package form factor, ensuring mechanical compatibility in PCB assembly.

Q: Why is the original LM4549BVH obsolete?

A: Product obsolescence is determined by the manufacturer. The LM4549BVH/NOPB remains in active production status, providing continuity for applications requiring this audio codec architecture.

Q: What are the critical parameters for substitution compatibility?

A: Substitution requires equivalence in AC '97 interface protocol, 18-bit resolution, dual ADC/DAC configuration, Sigma-Delta architecture, 90/89 dB dynamic range specifications, dual voltage supply ranges (4.2V–5.5V analog, 3.3V–5.5V digital), -40°C to 85°C operating temperature, and 48-LQFP package form factor.