Analog Devices Inc./Maxim Integrated MAX4334ESD

Overview

The MAX4334ESD from Maxim Integrated is a quad, low-power, rail-to-rail input/output operational amplifier optimized for single-supply, low-voltage precision signal conditioning. It delivers 3MHz gain-bandwidth, 245µA per amplifier quiescent current, ±0.65mV input offset voltage (max), and rail-to-rail output swing within 125mV of both rails into 2kΩ loads - making it suitable for battery-powered data-acquisition front-ends and portable medical sensors.

For engineers reviewing the MAX4334ESD datasheet, MAX4334ESD pinout, MAX4334ESD application, or MAX4334ESD equivalent, key selection criteria include its 14-pin SO package, -40°C to +85°C operating range, shutdown capability absence (unlike MAX4331/MAX4333), 2.3V–6.5V supply flexibility, and verified performance driving 2kΩ loads with <0.01% settling error.

Technical Context

The MAX4334ESD implements a dual NPN/PNP input stage enabling rail-to-rail common-mode input range extending 250mV beyond VEE and VCC, with crossover-region optimization to maintain CMRR >67dB across temperature. Its output stage uses complementary push-pull circuitry to achieve rail-to-rail swing while sustaining 20mA short-circuit current capability.

Unlike the MAX4331/MAX4333 variants, the MAX4334ESD lacks a dedicated shutdown pin - all four amplifiers operate continuously when powered. It is unity-gain stable, drives capacitive loads up to 150pF without oscillation, and exhibits no phase reversal under overdriven input conditions.

Key Specifications

Pinout & Package

MAX4334ESD is housed in a 14-pin small-outline (SO) package with standard JEDEC MS-012AC footprint (body size 8.65mm × 3.91mm, lead pitch 1.27mm). Pin 1 is marked via notch or dot; pin count increases left-to-right on top side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.

Compared with TLV2464IDR and AD8604ARUZ, the MAX4334ESD uniquely balances ultra-low supply voltage (2.3V), moderate bandwidth (3MHz), and low quiescent current (245µA) in a production-qualified 14-pin SO package - making it optimal for cost-sensitive, battery-constrained industrial and portable designs requiring guaranteed performance at end-of-battery-life voltage.

Availability

MAX4334ESD is available at Aetrix Electronics and suitable for portable medical devices, industrial process monitors, handheld test equipment, and battery management systems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX4334ESD 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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX4330–MAX4334 family was engineered specifically for low-voltage, single-supply signal conditioning in space-constrained portable systems - emphasizing rail-to-rail I/O, micropower operation, and robustness against overvoltage and capacitive loading.

FAQ

Does the MAX4334ESD have a shutdown pin?

No, the MAX4334ESD does not include a shutdown function. Unlike the MAX4331 and MAX4333 variants, it lacks SHDN pins and operates continuously whenever powered. This simplifies control logic but means power reduction requires global supply gating. The MAX4334ESD draws 245µA per amplifier regardless of signal activity - total 980µA for all four channels at +25°C.

What is the maximum capacitive load the MAX4334ESD can drive stably?

The MAX4334ESD remains stable with capacitive loads up to 150pF when driving purely resistive loads ≥2kΩ, as confirmed in the Capacitive Load Stability graph (TOC21) of the datasheet. Driving larger capacitances - such as ADC input capacitors exceeding 150pF - requires adding a 10–39Ω isolation resistor between the MAX4334ESD output and the load to maintain phase margin >45°.

Can the MAX4334ESD operate from a 2.0V supply?

While the absolute minimum rated supply is +2.3V, the MAX4334ESD typically functions down to +2.0V per the "Minimum Operating Voltage vs. Temperature" curve (TOC18). However, parameters like GBW (reduced to ~2.2MHz), output swing (degraded by ~30mV/rail), and CMRR (dropping to ~58dB) are not guaranteed below 2.3V. For production designs, maintain ≥2.3V to ensure full specification compliance across -40°C to +85°C.

How is input bias current managed across the common-mode range in the MAX4334ESD?

The MAX4334ESD uses complementary NPN/PNP input pairs, causing input bias current polarity to reverse near mid-supply (crossover region). At VCM = VEE or VCC, IB is +115nA or -115nA respectively; at VCM = VCC/2, IB crosses zero. To minimize offset, match source impedances seen by IN+ and IN− - e.g., use equal resistors in noninverting gain networks. Unmatched impedances induce voltage errors up to ±115nA × ΔR.

Is the MAX4334ESD pin-compatible with other devices in the MAX4330–MAX4334 family?

No - the MAX4334ESD (14-pin SO) is not pin-compatible with the MAX4330 (5-pin SOT23), MAX4331 (8-pin µMAX/SO), or MAX4332 (8-pin SO). Even the MAX4333 (10-pin µMAX / 14-pin SO) uses different pin assignments: its 14-pin SO variant routes SHDN1/SHDN2 to Pins 8/14, whereas MAX4334ESD uses those pins for IN4+/OUT4. PCB layout must be designed specifically for the MAX4334ESD's 14-pin SO pinout.