LM4927SD/NOPB Equivalent & Substitute Parts

Part Overview

The LM4927SD/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, designed for low-power audio applications. This device delivers 2.5W output power at 4Ω load impedance and operates across a 2.4V to 5.5V supply voltage range. The part is part of the Boomer® series and maintains Active product status with full RoHS3 compliance.

Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters of this amplifier category, particularly when the original part faces inventory constraints or when alternative packaging formats are required for system integration.

Substiute Parts

LM4927SD/NOPB

Texas InstrumentsIn Stock: 1138LM4927SD/NOPB Datasheet

Current PartRFQ

TS4990IQT

STMicroelectronicsIn Stock: 26274TS4990IQT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4927SD/NOPB is determined by the following critical parameters:

Functional Equivalence Criteria:

• Amplifier topology: Class AB configuration
• Channel configuration: 1-Channel (Mono) output
• Package form factor: 8-pin DFN/WFDFN with exposed pad (3x3mm footprint)
• Surface mount compatibility
• Operating temperature range: -40°C ~ 85°C minimum
• Supply voltage overlap: minimum 2.4V to 5.5V range
• Thermal protection and differential input capability

Output Power Consideration: The LM4927SD/NOPB delivers 2.5W at 4Ω load. Substitute parts may deliver different output power at different load impedances. Substitution is valid when the substitute part can deliver adequate power for the target application load impedance, provided all other electrical and mechanical parameters align.

Feature Alignment: Core protection features (thermal protection, depop functionality, differential inputs) must be present in substitute parts to ensure system-level reliability and audio quality.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: LM4927SD/NOPB

The LM4927SD/NOPB remains the primary component choice when:

• Output power requirement is 2.5W at 4Ω load impedance
• Texas Instruments supply chain and support infrastructure is preferred
• Shutdown control functionality is required for power management
• Tape & Reel packaging format is specified for automated assembly

Substitute Selection: TS4990IQT

The TS4990IQT (STMicroelectronics) is a valid substitute when:

• Application load impedance is 8Ω or higher, where 1.2W output power is sufficient
• STMicroelectronics component availability or supply agreements are in effect
• Standby mode operation meets system power management requirements
• Cut Tape or Digi-Reel® packaging formats are acceptable for assembly processes

Both parts maintain Active product status, full RoHS3 compliance, and identical MSL ratings. Both operate across overlapping supply voltage ranges and identical temperature specifications. Package footprints are mechanically compatible (3x3mm DFN variants with exposed pad).

Frequently Asked Questions (FAQ)

Q: Can the TS4990IQT directly replace the LM4927SD/NOPB in all applications?

A: Direct replacement depends on load impedance. The LM4927SD/NOPB delivers 2.5W at 4Ω, while the TS4990IQT delivers 1.2W at 8Ω. If your application uses a 4Ω load and requires 2.5W output power, the TS4990IQT is not suitable. If your application uses an 8Ω load or higher and 1.2W is sufficient, substitution is valid.

Q: Are the package footprints identical?

A: Both parts use 8-pin DFN packages with 3x3mm footprints and exposed pads. The LM4927SD/NOPB uses 8-WFDFN, while the TS4990IQT uses 8-VFDFN. These are mechanically compatible for PCB layout purposes, though minor pin configuration verification is required during design review.

Q: What is the difference between Shutdown and Standby control?

A: The LM4927SD/NOPB includes a Shutdown control pin for complete power-down functionality. The TS4990IQT includes Standby mode for reduced-power operation. Both provide power management capability; the specific control mechanism differs between manufacturers.

Q: Are both parts RoHS compliant?

A: Yes. Both the LM4927SD/NOPB and TS4990IQT are ROHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity level), indicating no special moisture handling requirements during storage or assembly.

Q: What is the supply voltage overlap between these parts?

A: The LM4927SD/NOPB operates from 2.4V to 5.5V. The TS4990IQT operates from 2.2V to 5.5V. The overlapping range is 2.4V to 5.5V. If your system operates below 2.4V, only the TS4990IQT is suitable.

Q: Can I use either part in automotive or industrial temperature applications?

A: Both parts specify -40°C to 85°C operating temperature range. This range is suitable for commercial and industrial applications. Automotive-grade temperature specifications (typically -40°C to 125°C) are not provided for either part.