Texas Instruments LMH6640MF

Overview

LMH6640MF from Texas Instruments (formerly National Semiconductor) is a single, rail-to-rail output voltage-feedback operational amplifier optimized for TFT-LCD VCOM buffering. It delivers ±100 mA linear output current, 190 MHz −3 dB bandwidth at 16 V supply, and 170 V/µs slew rate, operating from 4.5 V to 16 V with input common-mode range extending to −0.3 V below V− and within 0.9 V of V+. It is used in high-current, low-voltage video signal conditioning.

For engineers reviewing the LMH6640MF datasheet, LMH6640MF pinout, LMH6640MF application, or LMH6640MF equivalent, key selection criteria include its 100 mV rail-to-rail output swing, differential gain/phase performance (0.12%/0.12°), THD of −64 dBc @ 5 MHz, stability under unity-gain capacitive loading, and SOT23-5 package suitability for space-constrained display driver designs.

Technical Context

The LMH6640MF employs National's VIP10 process to achieve high-speed, high-output-current operation without phase reversal when input common-mode voltage exceeds limits. Its voltage-feedback architecture supports stable unity-gain operation into heavy capacitive loads typical of TFT panel VCOM nodes - up to 200 nF with series resistance as low as 20 Ω.

It features fully characterized performance across both 5 V and 16 V supplies, with guaranteed specifications including 35 ns settling time (±0.1%, 2 VPP), 0.35 Ω closed-loop output resistance at 1 MHz, and no output phase reversal under overdrive - critical for robust video signal integrity in portable and automotive displays.

Key Specifications

Pinout & Package

LMH6640MF is housed in a 5-pin SOT23 package (NSC drawing MF05A), measuring 2.9 mm × 1.6 mm × 1.1 mm, with exposed pad for thermal enhancement. The package is RoHS-compliant and optimized for high-density PCB layouts in display modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS3201DR and OPA695IDBVR, the LMH6640MF offers uniquely balanced trade-offs: industry-leading ±100 mA output current in SOT23-5, guaranteed no-phase-reversal operation, and video-optimized distortion metrics - making it the most integrated solution for space-constrained, high-fidelity TFT-LCD VCOM buffering.

Availability

LMH6640MF is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, portable video system integration, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMH6640MF 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 acquired National Semiconductor in 2011 and maintains its precision analog portfolio, including high-speed op-amps designed for signal integrity, low-noise performance, and industrial reliability.

The LMH6640MF belongs to National's LMH™ high-speed amplifier family, engineered specifically for video, imaging, and high-current buffer applications where rail-to-rail swing, capacitive load drive, and video-grade distortion performance are essential.

FAQ

What is the maximum capacitive load the LMH6640MF can drive stably in unity-gain configuration?

The LMH6640MF is characterized for stable operation into 200 nF capacitive loads with series resistance down to 20 Ω, as validated in TFT VCOM application testing. Its internal compensation and no-phase-reversal architecture allow reliable unity-gain use without external isolation resistors in most panel designs - unlike many general-purpose op-amps that oscillate under similar conditions. This makes LMH6640MF particularly robust for direct VCOM node interfacing.

Does the LMH6640MF support true single-supply operation with input referenced to ground?

Yes, the LMH6640MF supports true single-supply operation: its input common-mode voltage range extends to −0.3 V below V− (i.e., −0.3 V with V− = 0 V) and to within 0.9 V of V+, enabling ground-referenced inputs at 5 V or 16 V supply. This eliminates the need for level-shifting networks in VCOM buffer and ADC driver applications, simplifying design and reducing component count for the LMH6640MF implementation.

What is the thermal resistance (θ_JA) of the LMH6640MF in its SOT23-5 package?

The LMH6640MF has a package thermal resistance (θ_JA) of 265 °C/W when soldered directly onto a standard PCB, per National Semiconductor's MF05A package specification. This value assumes no thermal vias or copper pour enhancements; designers should verify junction temperature under worst-case power dissipation (e.g., 65 mW at 16 V, ±100 mA) to ensure operation remains within the −40°C to +85°C ambient range for the LMH6640MF.

How does the LMH6640MF perform in differential gain and phase at NTSC frequencies?

The LMH6640MF achieves 0.12% differential gain and 0.12° differential phase error at NTSC frequencies with 150 Ω load, meeting broadcast-quality video standards. These values are measured under AV = +2, RL = 150 Ω to V+/2 conditions and reflect its optimized internal architecture for minimal amplitude and timing distortion - a key differentiator for LMH6640MF in analog video signal path applications such as TFT-LCD source driver interfaces.

Is the LMH6640MF pin-compatible with other SOT23-5 op-amps like the LMV721 or TLV2460?

No, the LMH6640MF is not pin-compatible with LMV721 or TLV2460. While all three use SOT23-5 packages, their pinouts differ: LMH6640MF assigns Pin 1 to IN−, Pin 2 to IN+, Pin 3 to V−, Pin 4 to OUT, and Pin 5 to V+; LMV721 uses Pin 1 for output, Pin 2 for IN−, Pin 3 for IN+, Pin 4 for V−, and Pin 5 for V+. Substituting without layout revision will cause functional failure - LMH6640MF requires dedicated PCB footprint alignment.