Texas Instruments LMH6655MM

Overview

LMH6655MM from Texas Instruments is a dual-channel, voltage-feedback operational amplifier designed for high-speed signal conditioning in portable and power-sensitive systems. It delivers 250 MHz unity-gain bandwidth, 200 V/µs slew rate, 4.5 nV/√Hz input voltage noise, ±2.5 V to ±6 V supply operation, and rail-to-rail output swing into 100 Ω - enabling precision ADC driving and video signal amplification in battery-powered instrumentation.

For engineers reviewing the LMH6655MM datasheet, LMH6655MM pinout, LMH6655MM application, or LMH6655MM equivalent, key selection criteria include its dual-channel layout in VSSOP-8 package, low-noise performance at 1–10 MHz, true single-supply capability with −5.15 V to +3.7 V input common-mode range, and verified crosstalk rejection of −80 dB at 5 MHz - critical for multi-channel analog front-ends requiring channel isolation.

Technical Context

The LMH6655MM implements a voltage-feedback architecture built on TI's VIP10™ complementary bipolar process, supporting stable unity-gain operation without external compensation. Its differential input stage enables wide input common-mode range (−5.15 V to +3.7 V), while the output stage delivers symmetrical sourcing/sinking current (≥130 mA) and maintains >50° phase margin across gain settings from +1 to +10.

It operates over −40°C to +85°C with 4.5 mA per channel supply current, and features integrated channel-to-channel crosstalk suppression (−80 dB at 5 MHz), making it suitable for dual-path signal chains where inter-channel interference must be minimized - such as xDSL receiver line drivers or stereo active filter banks.

Key Specifications

Pinout & Package

The LMH6655MM is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, optimized for space-constrained PCB layouts while maintaining thermal performance (R_θJA = 235 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6655MA and THS3202D, the LMH6655MM uniquely balances 250 MHz bandwidth, 4.5 mA/channel power, and 4.5 nV/√Hz noise in a 3 mm × 3 mm VSSOP package - making it optimal for space- and power-constrained dual-channel analog signal chains where thermal density and SNR are critical.

Availability

LMH6655MM is available at Aetrix Electronics and suitable for ADC driver, consumer video interface, active filter, and xDSL receiver applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for LMH6655MM 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 connectivity technologies for industrial, automotive, and communications markets.

The LMH6655MM belongs to TI's high-speed voltage-feedback op-amp product line, engineered for low-power, high-fidelity signal conditioning in portable instrumentation, broadband communications, and video infrastructure - emphasizing bandwidth-noise-power tradeoff optimization.

FAQ

What is the maximum operating temperature for the LMH6655MM?

The LMH6655MM is rated for continuous operation from −40°C to +85°C ambient temperature. Its junction temperature must not exceed 150°C under any condition, and thermal design must account for its VSSOP-8 package R_θJA of 235 °C/W. Derating curves in the datasheet confirm stable performance across this full industrial range, with no parameter degradation at temperature extremes.

Does the LMH6655MM support single-supply operation?

Yes, the LMH6655MM supports true single-supply operation with input common-mode voltage ranging from −0.15 V to +3.7 V when V− = 0 V and V+ = 5 V. Its input stage operates 150 mV below the negative rail and within 1.3 V of the positive rail, enabling direct connection to ground-referenced sources without level-shifting circuitry - a key feature confirmed in Section 6.6 of the LMH6655MM datasheet.

What is the typical input offset voltage of the LMH6655MM?

The LMH6655MM has a typical input offset voltage of ±1 mV at ±5 V supply and 0 V common-mode voltage, with a maximum of ±3 mV over temperature. At 5 V single supply (VCM = 2.5 V), typical offset is ±2 mV and max is ±6.5 mV. This low offset enables precision DC-coupled gain stages without significant output error, especially in active filter and sensor interface applications.

Can the LMH6655MM drive a 50 Ω load?

The LMH6655MM is characterized for 100 Ω loads, delivering −3.6 V to +3.4 V swing. While it can source/sink ≥130 mA, sustained 50 Ω loading increases power dissipation and may reduce output swing due to internal resistance (~0.08 Ω). For 50 Ω systems, use a series 25 Ω resistor (as recommended in TI's application notes) to isolate the op-amp and maintain stability and specified performance.

Is the LMH6655MM pin-compatible with other TI dual op-amps like the OPA2350?

No, the LMH6655MM is not pin-compatible with the OPA2350 or other TI dual op-amps. Its VSSOP-8 pinout (OUT A, −IN A, +IN A, V−, −IN B, +IN B, OUT B, V+) is unique to the LMH665x family. Substituting requires PCB layout revision. Pin compatibility is only guaranteed within the LMH6655 family - e.g., LMH6655MM and LMH6655MA share identical pin functions but differ in package outline and thermal characteristics.