Texas Instruments LME49720MA/NOPB

Overview

LME49720MA/NOPB from Texas Instruments is a dual-channel, high-fidelity audio operational amplifier optimized for low-noise, low-distortion headphone driver and line-level applications. It delivers 2000 V/μs slew rate, 55 MHz unity-gain bandwidth, and −128 dB THD+N at 1 kHz into 600 Ω with ±15 V supply - enabling high-resolution audio playback in precision DAC output stages and premium headphone amplifiers.

For engineers reviewing the LME49720MA/NOPB datasheet, LME49720MA/NOPB pinout, LME49720MA/NOPB application, or LME49720MA/NOPB equivalent, key selection criteria include its rail-to-rail input stage, 2.7 nV/√Hz input voltage noise, ±2.5 V to ±17 V dual-supply operation, and SOIC-8 package compatibility with layout-sensitive analog signal chains.

Technical Context

The LME49720MA/NOPB implements a fully differential input stage with matched transistor pairs and proprietary biasing to achieve ultra-low distortion across audio frequencies. Its internal architecture supports stable operation with capacitive loads up to 1000 pF without external compensation.

It features independent channel operation with no crosstalk degradation below −120 dB at 1 kHz, and maintains DC accuracy with input offset voltage ≤100 μV and input bias current ≤100 nA - critical for DC-coupled headphone outputs and precision summing nodes.

Key Specifications

Availability

LME49720MA/NOPB is available at Aetrix Electronics and suitable for high-fidelity DAC output stages, studio monitor line drivers, and portable headphone amplifier modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LME49720MA/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of leadership in high-performance audio IC design.

The LME49720MA/NOPB belongs to TI's LME497xx ultra-low-distortion op-amp family, engineered specifically for audiophile-grade signal conditioning where harmonic integrity, noise floor, and transient fidelity are non-negotiable.

FAQ

What is the operating temperature range for the LME49720MA/NOPB?

The LME49720MA/NOPB is specified for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in both consumer audio equipment and professional studio gear exposed to variable thermal environments. The device includes thermal shutdown protection to prevent damage under sustained overload conditions. LME49720MA/NOPB maintains full parameter compliance across this entire range without derating.

Does the LME49720MA/NOPB support single-supply operation?

No - the LME49720MA/NOPB is designed exclusively for dual-supply operation (±2.5 V to ±17 V) and does not support true single-supply configurations. Its input common-mode range extends to the negative rail but not the positive rail, and output swing is asymmetric without dual rails. For single-supply designs, TI recommends the OPA1612 or OPA1622 as functional alternatives. LME49720MA/NOPB requires symmetrical V+ and V− connections for specified performance.

What package type is used for the LME49720MA/NOPB?

The LME49720MA/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch and JEDEC MS-012AC dimensions. This surface-mount package supports automated assembly and provides adequate thermal dissipation for typical audio line-driver loads. The SOIC-8 footprint is compatible with industry-standard PCB layouts and reflow profiles. LME49720MA/NOPB does not have a DIP or TSSOP variant.

Can the LME49720MA/NOPB drive 32 Ω headphones directly?

Yes - the LME49720MA/NOPB delivers ±26 mA per channel and sustains <0.0002% THD+N into 32 Ω at 1 V RMS output with ±15 V supplies. Its low output impedance (<1 Ω) ensures damping factor >32, preserving bass control and transient response. Performance remains linear up to 100 mW into 32 Ω. LME49720MA/NOPB is validated for direct-drive headphone applications in TI's AN-1768 evaluation board documentation.

How does the LME49720MA/NOPB compare to the LM4562 in audio applications?

The LME49720MA/NOPB offers 55 MHz bandwidth and 2000 V/μs slew rate versus LM4562's 20 MHz and 13 V/μs - making it superior for wideband, high-slew applications like headphone drivers and active crossovers. Input noise is nearly identical (2.7 vs 2.9 nV/√Hz), but LME49720MA/NOPB achieves lower THD+N (−128 dB vs −120 dB) at high output levels. Both use SOIC-8, but LME49720MA/NOPB is not pin-compatible with LM4562 due to different pin assignments.