Texas Instruments LMH6672MRX/NOPB

Overview

LMH6672MRX/NOPB from Texas Instruments is a dual, high-output-current, high-speed voltage-feedback operational amplifier optimized for xDSL line driving. It delivers ±200 mA output current at 9.6 VPP single-ended into 25 Ω, achieves 90 MHz −3 dB bandwidth (G = +2), and maintains −98 dBc distortion at 1 MHz when driving 50 Ω differentially - enabling full-rate ADSL upstream compliance.

For engineers reviewing the LMH6672MRX/NOPB datasheet, LMH6672MRX/NOPB pinout, LMH6672MRX/NOPB application, or LMH6672MRX/NOPB equivalent, key selection criteria include differential line driver capability, rail-to-rail output swing under heavy load (±4.8 V into 1 kΩ), low 3.1 nV/√Hz input noise, thermal performance in SO PowerPAD package, and stability at gain ≥ +2 V/V.

Technical Context

The LMH6672MRX/NOPB employs a class-AB output stage with 4.8 mA per channel idle current to sustain low distortion while delivering high peak currents. Its voltage-feedback architecture supports stable operation at closed-loop gains of +2 V/V or higher without external compensation.

Designed specifically for single-supply xDSL CPE applications, it operates from ±2.5 V to ±6.5 V (5 V to 13 V total), drives 25–100 Ω loads, and features input common-mode range extending to within 1 V of rails and output swing to within 1 V of supplies - critical for efficient transformer-coupled line interface designs.

Key Specifications

Pinout & Package

LMH6672MRX/NOPB uses the SO PowerPAD (DDA) 8-pin package (4.90 mm × 3.91 mm body, 1.75 mm height), featuring an exposed thermal pad for enhanced junction-to-board heat transfer (θJA = 58.6 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-output-current op amp applications.

Compared with LMH6672MA/NOPB, LMH6672MRX/NOPB offers 66% lower thermal resistance for sustained high-power line driving; compared with THS3091D, it provides matched dual channels, lower quiescent current, and guaranteed unity-gain-stable alternatives are not drop-in replacements due to differing pinouts, biasing, and stability requirements.

Availability

LMH6672MRX/NOPB is available at Aetrix Electronics and suitable for xDSL line drivers, ADSL PCI modem cards, and active broadband filters requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.

Supply support for LMH6672MRX/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 over 90 years of innovation in high-performance signal chain and power management solutions.

The LMH6672 product line was engineered specifically for xDSL and broadband line interface applications, emphasizing high output current, low distortion at high frequencies, and robust thermal performance in compact surface-mount packages.

FAQ

What is the maximum safe operating junction temperature for LMH6672MRX/NOPB?

The absolute maximum junction temperature for LMH6672MRX/NOPB is +150°C, as specified in the Absolute Maximum Ratings table. In typical ADSL CPE operation with 85°C ambient and 346 mW dissipation, the SO PowerPAD package achieves ~145°C junction temperature - staying within safe margin. Thermal derating is recommended above 125°C junction for long-term reliability.

Can LMH6672MRX/NOPB operate stably at unity gain (G = +1 V/V)?

No - LMH6672MRX/NOPB is explicitly specified and tested for stability only at closed-loop gains of +2 V/V or higher. Attempting unity-gain operation may cause oscillation or excessive ringing due to insufficient phase margin. For G = +1 applications, consider TI's OPA695 or THS3201, which are unity-gain stable.

Does LMH6672MRX/NOPB support true single-supply operation down to 5 V total supply?

Yes - LMH6672MRX/NOPB is fully characterized from ±2.5 V (5 V total) to ±6.5 V (13 V total). At ±2.5 V, it delivers 1.45 V output swing into 25 Ω and maintains −96 dBc 2nd harmonic distortion at 100 kHz, making it viable for low-voltage DSL variants and portable line interface modules.

How does the SO PowerPAD (DDA) package of LMH6672MRX/NOPB improve thermal performance over SOIC?

The SO PowerPAD package integrates an exposed copper thermal pad that, when soldered to a PCB ground plane, reduces junction-to-ambient thermal resistance from 172 °C/W (SOIC) to 58.6 °C/W. This 66% improvement enables LMH6672MRX/NOPB to dissipate 346 mW with only ~21°C rise above ambient - critical for sealed CPE enclosures.

What is the recommended power supply decoupling for LMH6672MRX/NOPB in high-frequency line driver layouts?

TI recommends 0.1 µF X7R ceramic capacitors placed within 2 mm of each supply pin (V+ and V−), plus a 10 µF tantalum or ceramic bulk capacitor near the device. The SO PowerPAD thermal pad must be connected to a solid ground plane using ≥4 thermal vias (0.3 mm diameter) to maximize heat extraction and stabilize reference potentials.