Analog Devices Inc./Maxim Integrated MAX4451ESA+

Overview

MAX4451ESA+ from Maxim Integrated is a dual, unity-gain-stable, rail-to-rail output operational amplifier optimized for high-speed video and instrumentation signal conditioning. It delivers 210MHz -3dB bandwidth, 485V/µs slew rate, and 0.02%/0.08° differential gain/phase error while operating from +4.5V to +11V single supply or ±2.25V to ±5.5V dual supplies - enabling use in surveillance video systems and analog-to-digital converter interfaces.

For engineers reviewing the MAX4451ESA+ datasheet, MAX4451ESA+ pinout, MAX4451ESA+ application, or MAX4451ESA+ equivalent, key selection criteria include its dual-channel SO-8 package, rail-to-rail output swing within 55mV of rails, low 6.5mA per amplifier quiescent current, and verified performance in 75Ω video line driving with <−65dBc SFDR at 5MHz.

Technical Context

The MAX4451ESA+ employs voltage-feedback architecture enhanced with current-feedback techniques to achieve wide bandwidth and fast transient response. Its input stage supports common-mode voltages extending beyond VEE (to −0.2V) and up to VCC − 2.25V, while the output stage uses local feedback to maintain low open-loop output impedance (1.5Ω typical) and minimize load-dependent gain variation.

It is internally compensated for stable unity-gain operation and requires only a 24Ω feedback resistor in that configuration. The device exhibits 55MHz 0.1dB gain flatness and maintains −63dB THD at 5MHz with 2V_P-P output into 100Ω, confirming suitability for precision video signal routing and CCD imaging front-ends.

Key Specifications

Pinout & Package

The MAX4451ESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 150-mil body width and gull-wing leads. Thermal resistance θ_JA is 5.9°C/mW, supporting continuous operation at +85°C ambient when properly mounted on FR-4 PCB with adequate copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6702MA/NOPB and ADA4891-2ARZ, the MAX4451ESA+ uniquely combines 210MHz bandwidth, rail-to-rail output, sub-7mA quiescent current, and broadcast-grade video linearity - making it the optimal choice for space-constrained, single-supply video routing and ADC interface designs requiring both speed and fidelity.

Availability

MAX4451ESA+ is available at Aetrix Electronics and suitable for surveillance video systems, analog-to-digital converter interfaces, and CCD imaging systems requiring stable component supply across extended production lifecycles.

Supply support for MAX4451ESA+ 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX4450/MAX4451 product line was designed specifically for high-fidelity, low-power video signal processing - targeting set-top boxes, digital cameras, and professional video equipment where bandwidth, linearity, and rail-to-rail operation are critical.

FAQ

What is the maximum capacitive load the MAX4451ESA+ can drive without oscillation?

The MAX4451ESA+ is not optimized for highly reactive loads. Driving >10pF capacitance directly causes peaking and instability. A series isolation resistor (20–30Ω) is required before capacitive loads; Figure 3 in the datasheet shows optimal R_ISO vs. C_L. For example, 68pF load requires ~27Ω resistor to maintain stable closed-loop response. MAX4451ESA+ must never drive coaxial cable without proper 75Ω termination at both ends.

Does the MAX4451ESA+ support true rail-to-rail input operation?

No - the MAX4451ESA+ features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode range extends from (VEE − 0.2V) to (VCC − 2.25V). At +5V supply, this means input can go down to −0.2V (ground-sensing) but only up to +2.75V, not to +5V. This design enables excellent CMRR and low distortion while maintaining stability in single-supply video applications.

Can the MAX4451ESA+ be used in a single +5V supply configuration for video line driving?

Yes - the MAX4451ESA+ is explicitly characterized and qualified for +4.5V to +11V single-supply operation. In +5V systems, it delivers rail-to-rail output swing (within 55mV of 0V and 5V), 0.02%/0.08° differential gain/phase, and −65dBc SFDR at 5MHz - all confirmed in the datasheet's AC Electrical Characteristics table. A 0.1µF bypass capacitor on VCC is mandatory for stable video performance.

What is the thermal performance of the MAX4451ESA+ in SO-8 package at +85°C ambient?

The MAX4451ESA+ SO-8 package has θ_JA = 5.9°C/mW. At 6.5mA per amplifier (13mA total) and +5V supply, power dissipation is ~65mW. This yields ~0.38°C junction-to-ambient rise - well within safe limits. With 1-in² 2-oz copper pour, θ_JA improves further. The device is rated for continuous operation from −40°C to +85°C ambient, and derating is not required under typical video line driver loads.

How does the MAX4451ESA+ compare to the single-channel MAX4450 in pin compatibility and layout?

The MAX4451ESA+ (SO-8) is *not* pin-compatible with the MAX4450 (SC70-5 or SOT23-5). They differ in channel count, pin count, and footprint. However, their electrical specs - bandwidth, slew rate, supply range, and video linearity - are identical per channel. Layout best practices (bypassing, grounding, short traces) apply equally, but PCB redesign is required to migrate from MAX4450 to MAX4451ESA+ due to package and pinout differences.