Texas Instruments LMH6609MAX

Overview

LMH6609MAX from Texas Instruments is a unity-gain-stable, voltage-feedback operational amplifier optimized for high-speed video, IF/RF, and active filter applications. It delivers 900MHz −3dB bandwidth at AV = 1 (±5V), 1400V/μs slew rate, 90mA linear output current, and 3.1nV/√Hz input voltage noise - enabling single-supply or dual-supply driving of multiple 75Ω video loads or high-fidelity ADC/DAC interfaces.

For engineers reviewing the LMH6609MAX datasheet, LMH6609MAX pinout, LMH6609MAX application, or LMH6609MAX equivalent, this page provides verified technical context, package-specific pin mapping, real-world application constraints (e.g., capacitive load mitigation with ROUT), and validated alternative op-amps for bandwidth-critical signal conditioning designs.

Technical Context

The LMH6609MAX uses a voltage-feedback architecture with symmetrical, balanced inputs and matched bias currents - enabling precise DC offset cancellation via impedance balancing. Its unity-gain stability eliminates external compensation in buffer or gain-of-1 configurations, while its GBP of 240MHz supports predictable closed-loop bandwidth scaling (f_−3dB ≈ GBP/A_V) for gains ≥5.

Designed in TI's VIP10™ process, it achieves low distortion (HD2 = −63dBc at 20MHz) and exceptional video fidelity (0.01% differential gain, 0.026° differential phase at 4.43MHz), with thermal design governed by θ_JA = 145°C/W (SOIC-8) and maximum junction temperature of +150°C.

Key Specifications

Pinout & Package

LMH6609MAX is supplied in an 8-pin SOIC (Package Code: D) with standard pinout and JEDEC-compliant lead finish (Sn). Thermal resistance is θ_JA = 145°C/W and θ_JC = 65°C/W. RoHS-compliant, MSL Level-1, peak reflow 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6609MAX, LMH6629MA/NOPB trades 28% lower noise and +67% bandwidth for +79% supply current and reduced layout margin, while THS3201DGN abandons voltage-feedback flexibility for raw speed - making LMH6609MAX the optimal balance for video, active filters, and general-purpose high-fidelity analog signal chains.

Availability

LMH6609MAX is available at Aetrix Electronics and suitable for video line drivers, IF/RF amplifiers, and A/D input drivers requiring stable component supply, consistent SOIC-8 packaging, and guaranteed −40°C to +85°C operation.

Supply support for LMH6609MAX 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 high-speed op-amp design and manufacturing.

The LMH6609MAX belongs to TI's LMH high-speed amplifier product line, engineered specifically for demanding video, communications, and instrumentation applications where bandwidth, linearity, and low noise must coexist at low power.

FAQ

What is the maximum capacitive load the LMH6609MAX can drive without instability?

The LMH6609MAX requires a series output resistor (ROUT) when driving >10pF capacitive loads. For 100pF loads, TI recommends ROUT = 17Ω (±5V) or 55Ω (±3.3V) to limit peaking to ≤0.5dB. Without ROUT, oscillation or excessive ringing occurs above ~30pF due to phase margin degradation. The LMH6609MAX datasheet Figure 11 provides exact ROUT vs. CL guidance.

Does the LMH6609MAX support single-supply operation?

Yes, the LMH6609MAX operates from split supplies (±3.3V to ±6V) or single-ended rails (e.g., 0V and +6.6V to +12V), provided the input common-mode range (±3.0V at ±5V supply) and output swing (±3.5V into 100Ω) remain within specification. DC-coupled single-supply use requires level-shifting the input and biasing the non-inverting input to mid-rail.

How does the LMH6609MAX compare to the CLC440 in video applications?

The LMH6609MAX is explicitly positioned as an improved replacement for the CLC440, offering 900MHz bandwidth (vs. 600MHz), 0.01%/0.026° differential gain/phase (vs. 0.02%/0.05°), and 7mA supply current (vs. 12mA). It also features enhanced ESD protection (2000V HBM) and VIP10™ process reliability - making LMH6609MAX superior for modern PAL/NTSC distribution amplifiers.

Can the LMH6609MAX be used in transimpedance amplifier configurations?

Yes, the LMH6609MAX is well-suited for transimpedance amplifiers due to its unity-gain stability, low 1.6pA/√Hz current noise, and 3.1nV/√Hz voltage noise. With photodiode capacitance CD, start with feedback capacitor CF ≈ ½ CD (e.g., 1pF CF for 2pF CD) to ensure stability and flat frequency response - as validated in TI's LMH6609 Application Note Figure 38.

What is the thermal derating limit for continuous operation of the LMH6609MAX in SOIC-8 package?

At ambient temperature T_AMB, the LMH6609MAX's maximum allowable power dissipation is P_MAX = (150°C − T_AMB) / 145°C/W. For example, at 70°C ambient, P_MAX = 0.55W. Exceeding this causes junction temperature to breach 150°C, risking parametric shift or failure. Forced air cooling or copper pour under the exposed pad (if modified) extends usable power range.