Texas Instruments LMH6624MAX

Overview

LMH6624MAX from Texas Instruments is a single-channel ultra-low-noise, wideband voltage-feedback operational amplifier optimized for high-fidelity signal conditioning in demanding analog front-ends. It delivers 1.5 GHz gain bandwidth, 0.92 nV/√Hz input voltage noise, 350 V/μs slew rate (AV = 20), ±700 µV max input offset voltage over temperature, and stable operation at closed-loop gains ≥10 - enabling precision DC-coupled amplification of fast, low-amplitude signals in ultrasound pre-amplifiers and instrumentation sense circuits.

For engineers reviewing the LMH6624MAX datasheet, LMH6624MAX pinout, LMH6624MAX application, or LMH6624MAX equivalent, key selection criteria include its SOT-23-5 package footprint, ±2.5 V to ±6 V dual-supply operation, 0.92 nV/√Hz noise floor at 1 MHz, 350 V/μs slew rate under AV = 20, and guaranteed stability for |AV| ≥10 in both inverting and non-inverting configurations.

Technical Context

The LMH6624MAX employs a traditional voltage-feedback topology with balanced differential inputs, delivering 81 dB open-loop gain, 95 dB CMRR, and 88 dB PSRR - critical for rejecting supply and common-mode interference in high-gain sensor interfaces. Its architecture supports rail-to-rail output swing (±4.9 V on ±6 V) while maintaining sub-20 ns 0.1% settling time and <−63 dBc HD2 at 10 MHz.

Designed for low-noise, wide-dynamic-range applications, it features input bias current cancellation techniques and operates across −40°C to +125°C with ±0.2 µV/°C typical VOS drift. The device's 2.3 pA/√Hz input current noise and 4.6 kΩ differential input resistance support high-impedance source interfacing without significant noise degradation.

Key Specifications

Pinout & Package

SOT-23-5 package: 2.90 mm × 1.60 mm body, surface-mount, thermally enhanced plastic case with exposed pad (not electrically connected). Pin 1 = Output, Pin 2 = V−, Pin 3 = +IN, Pin 4 = −IN, Pin 5 = V+.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-noise wideband op-amp applications.

Compared with LMH6624MAX, LMH6629MA/NOPB offers lower noise and higher bandwidth but demands higher minimum gain and power, while OPA847IDBVR provides superior noise and speed at the cost of pinout compatibility and supply current - making LMH6624MAX the optimal balance of noise, stability, package size, and efficiency for mid-bandwidth precision analog front-ends.

Availability

LMH6624MAX is available at Aetrix Electronics and suitable for ultrasound pre-amplifiers, instrumentation sense amplifiers, and wide band active filters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical and industrial OEM programs.

Supply support for LMH6624MAX 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and communications product portfolios.

The LMH6624MAX belongs to TI's high-speed precision op-amp product line, engineered specifically for applications demanding ultra-low noise, wide bandwidth, and robust DC accuracy - including medical imaging, test equipment, and high-fidelity signal acquisition.

FAQ

What is the maximum recommended supply voltage for LMH6624MAX?

The absolute maximum supply voltage (V+ − V−) for LMH6624MAX is 13.2 V, but the recommended operating range is ±2.25 V to ±6.3 V. Operation at ±6 V delivers full specified performance including ±4.9 V output swing and 350 V/μs slew rate; exceeding ±6 V risks permanent damage and voids parametric guarantees. Always observe the 150°C maximum junction temperature limit during continuous operation.

Is LMH6624MAX stable in unity-gain configuration?

No, LMH6624MAX is not unity-gain stable. It is explicitly characterized and guaranteed stable only for closed-loop gains |AV| ≥ 10, as confirmed in the datasheet's "Stable for Closed Loop |AV| ≥10" feature and Figure 45–46 showing peaking at lower gains. Attempting unity-gain use will cause oscillation or excessive ringing; for G = 1 applications, consider TI's OPA837 or OPA836 instead.

Does LMH6624MAX support single-supply operation?

Yes, LMH6624MAX supports single-supply operation from 5 V to 12 V, with input common-mode range extending to within 0.5 V of the negative rail and output swing to within 0.8 V of either rail. For example, on +5 V/0 V supply, it achieves ±1.0 V output swing into 100 Ω, enabling use in DC-coupled sensor interfaces where rail-splitting is impractical.

What is the thermal resistance (RθJA) of LMH6624MAX in SOT-23-5 package?

The junction-to-ambient thermal resistance (RθJA) for LMH6624MAX in the SOT-23-5 (DBV) package is 265°C/W, as specified in Section 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves significantly with copper pour and thermal vias under the exposed pad - though the pad is not electrically connected and serves only mechanical/thermal purposes.

How does LMH6624MAX compare to CLC425 in terms of noise and bandwidth?

LMH6624MAX is an improved replacement for CLC425, offering 0.92 nV/√Hz input voltage noise versus CLC425's 1.2 nV/√Hz, and 1.5 GHz gain bandwidth versus CLC425's 1.05 GHz. It also reduces input offset voltage drift to ±0.2 µV/°C (vs. ±1.0 µV/°C) and improves PSRR by 5–10 dB - directly enhancing dynamic range and DC stability in high-gain, low-noise applications like magnetic tape playback amplifiers.