LM4546BVH Audio Codec Equivalent & Substitute Parts

Part Overview

The LM4546BVH is an audio codec IC implementing the AC '97 interface standard for multi-channel audio processing. This 48-pin LQFP surface mount device integrates dual ADCs and DACs with 18-bit resolution and sigma-delta conversion architecture. The main part is classified as obsolete, making substitute identification critical for ongoing system support and new design implementations. Locating functionally equivalent alternatives ensures continuity in audio codec applications requiring AC '97 compliance and matching electrical specifications.

Substiute Parts

LM4546BVH

Texas InstrumentsIn Stock: 2198LM4546BVH Datasheet

Current PartRFQ

LM4546BVH/NOPB

National SemiconductorIn Stock: 1258LM4546BVH/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4546BVH is determined by strict alignment across the following critical parameters:

• Audio codec type and interface standard: AC '97 serial interface
• Pin count and physical package: 48-pin LQFP (7x7mm)
• Functional architecture: Dual ADC/DAC configuration with sigma-delta conversion
• Resolution specification: 18-bit audio processing
• Dynamic range performance: ADC 90 dB, DAC 89 dB typical
• Supply voltage ranges: Analog 4.2V–5.5V, Digital 3V–5.5V
• Operating temperature range: -40°C to 85°C
• Surface mount compatibility

The LM4546BVH/NOPB qualifies as a direct substitute based on identical alignment across all specified electrical, functional, and mechanical parameters. The NOPB suffix indicates lead-free packaging compliance, representing a manufacturing variant of the same base device.

Parameter Comparison

Engineering Selection Recommendations

The LM4546BVH/NOPB is the qualified substitute for the obsolete LM4546BVH. Both devices share identical electrical specifications, functional architecture, and physical packaging. The primary distinction is product status: the original part is obsolete while the substitute maintains active availability. Both parts carry identical export classification (EAR99) and tariff codes, ensuring regulatory consistency.

Selection of the LM4546BVH/NOPB is appropriate for applications requiring AC '97 audio codec functionality with 18-bit resolution, dual ADC/DAC channels, and 48-LQFP surface mount integration. The NOPB designation confirms lead-free solder compatibility, aligning with modern manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the LM4546BVH/NOPB directly replace the LM4546BVH in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The NOPB suffix indicates lead-free packaging compliance and does not affect functional compatibility.

Q: What does the NOPB suffix indicate?

A: NOPB designates "No Plumbum" (lead-free) packaging. This is a manufacturing variant that meets lead-free solder requirements while maintaining identical electrical performance and pin configuration.

Q: Are there differences in supply voltage requirements between these parts?

A: No. Both the LM4546BVH and LM4546BVH/NOPB require identical analog supply voltage (4.2V–5.5V) and digital supply voltage (3V–5.5V) ranges.

Q: Do both parts support the same operating temperature range?

A: Yes. Both devices operate across -40°C to 85°C, ensuring thermal compatibility in equivalent applications.

Q: Is the 48-LQFP package identical for both parts?

A: Yes. Both parts use the same 48-pin LQFP (7x7mm) surface mount package with identical pin assignments and mechanical dimensions.

Q: What is the significance of the LM4546BVH being obsolete?

A: Obsolete status indicates the original part is no longer manufactured by Texas Instruments. The LM4546BVH/NOPB substitute maintains active production status, ensuring long-term availability for new designs and system support.

Q: Are export classifications identical for both parts?

A: Yes. Both parts carry EAR99 export classification and 8542.39.0001 tariff code, ensuring regulatory consistency in international applications.