Texas Instruments LMH6720MFX

Overview

LMH6720MFX from Texas Instruments is a single-channel, current-feedback video operational amplifier with TTL-compatible shutdown control, 400MHz small-signal bandwidth (AV = +2V/V, VOUT = 500mVPP), 1800V/μs slew rate, and 0.02% differential gain error at 4.43MHz driving 150Ω loads - deployed in broadcast-quality video switching and high-speed multiplexing systems.

For engineers reviewing the LMH6720MFX datasheet, LMH6720MFX pinout, LMH6720MFX application, or LMH6720MFX equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, shutdown timing (11ns on / 7ns off), differential gain/phase performance, and real-world video system integration guidance - all confirmed against TI's SNOSA39G Rev. G datasheet.

Technical Context

The LMH6720MFX uses TI's VIP10 high-speed complementary bipolar process with current-feedback topology, enabling wideband operation independent of closed-loop gain when paired with optimized feedback resistors (e.g., 300Ω for AV = +2). Its input buffer features ~180Ω output impedance, requiring careful RF/RG selection to avoid peaking or instability.

Unlike voltage-feedback op amps, the LMH6720MFX maintains flat frequency response up to 120MHz (0.1dB gain flatness) and delivers 70mA continuous output current into 100Ω loads while operating from ±4V to ±6.25V supplies - making it suitable for back-terminated 75Ω video distribution and active filter stages where transient fidelity is critical.

Key Specifications

Pinout & Package

LMH6720MFX is packaged in an 8-pin SOIC (D package), with thermal resistance θJA = 145°C/W. Pin functions are validated per Figure 7 of SNOSA39G Rev. G.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed video amplifier applications.

Compared with LMH6714MA/NOPB, LMH6720MFX trades marginal DG/DP improvement for TTL shutdown control and SOIC-8 compatibility; versus LMH6722MAX/NOPB, it offers lower power and simpler layout at the cost of channel count - making LMH6720MFX ideal for discrete high-speed switching nodes.

Availability

LMH6720MFX is available at Aetrix Electronics and suitable for HDTV video switching matrices, back-terminated coaxial drivers, and programmable gain amplifier modules requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for LMH6720MFX 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, embedded processing, and high-performance signal chain solutions, with decades of expertise in video infrastructure and high-speed amplification.

The LMH6720MFX belongs to TI's LMH67xx wideband video op amp family, designed specifically for broadcast-quality NTSC/PAL video systems, high-speed multiplexing, and active filter applications demanding sub-1% differential gain error and GHz-class transient response.

FAQ

What is the recommended feedback resistor value for LMH6720MFX at AV = +2V/V?

The LMH6720MFX datasheet specifies a 300Ω feedback resistor (RF) for non-inverting gain of +2V/V with ±5V supplies and optimal bandwidth/gain flatness. Using RF = 300Ω achieves 400MHz −3dB bandwidth and 0.1dB gain flatness to 120MHz. Deviating significantly - e.g., RF = 147Ω - causes peaking, while RF = 400Ω improves stability at minor bandwidth cost. The LMH6720MFX must never be used with RF = 0Ω (buffer shorted).

Does LMH6720MFX support single-supply operation?

Yes, LMH6720MFX operates from a total supply range of 8V to 12.5V, including single-ended configurations (e.g., V+ = +10V, V− = GND). However, the shutdown pin (SD) must not fall below VCC/2 in single-supply mode - applying <0.8V to SD while VCC = +10V violates the −1V limit relative to midpoint (5V), risking damage. For safe single-supply use, tie SD to VCC or use a resistor divider to ensure SD stays within 0–5V.

How does LMH6720MFX differ from LMH6714 in video performance?

LMH6720MFX exhibits 0.02% differential gain error at 4.43MHz (150Ω), while LMH6714 achieves 0.01% under identical conditions - a measurable but often imperceptible difference in broadcast monitoring. Both share identical 400MHz bandwidth and 1800V/μs slew rate. The key functional distinction is LMH6720MFX's integrated TTL-compatible shutdown pin, absent in LMH6714, enabling dynamic channel gating in multiplexed video systems.

Can LMH6720MFX drive a 75Ω back-terminated video load directly?

Yes, LMH6720MFX is explicitly characterized for 150Ω video loads (two 75Ω in series), delivering 0.02% DG/0.01° DP at 4.43MHz. Its 70mA continuous output current and ±3.8V swing into 100Ω confirm robust drive capability. For true 75Ω back-termination, place a 75Ω resistor at the load end and match source impedance - LMH6720MFX's low 0.06Ω closed-loop output resistance ensures minimal mismatch-induced reflections.

What is the thermal performance of LMH6720MFX in SOIC-8 package?

LMH6720MFX in SOIC-8 (package D) has a junction-to-ambient thermal resistance (θJA) of 145°C/W. At ±5V supplies and 5.6mA quiescent current, dissipation is ~56mW. With 25°C ambient, junction temperature rises ~8.1°C - well below the 150°C maximum. Derating is required above 85°C ambient; for extended temperature operation, consider forced airflow or thermal vias under the exposed pad (though SOIC-8 lacks thermal pad).