Analog Devices Inc./Maxim Integrated MAX6120ESA+T

Overview

MAX6120ESA+T from Maxim Integrated is a precision 3-terminal, 1.2V voltage reference in SOT23-3 package, designed for ultra-low-power battery-operated systems. It delivers ±1% initial accuracy, 30ppm/°C typical temperature coefficient, and 50µA typical supply current independent of input voltage - enabling high-efficiency operation across 2.4V–11V supply range in portable instrumentation and data-acquisition circuits.

For engineers reviewing the MAX6120ESA+T datasheet, MAX6120ESA+T pinout, MAX6120ESA+T application, or MAX6120ESA+T equivalent, key selection criteria include micropower consumption (<70µA max), guaranteed TC <100ppm/°C over –40°C to +85°C, 1.2V output stability under load variation, and SOT23-3 footprint compatibility with space-constrained PCB layouts.

Technical Context

The MAX6120ESA+T implements a bandgap-based 3-terminal series voltage reference architecture optimized for minimal quiescent current. Its supply current remains stable across input voltages (2.4V–11V) and temperatures (–40°C to +85°C), eliminating dependency on external bias resistors required by shunt references.

It achieves precision via curvature-compensated bandgap core and laser-trimmed resistive elements, delivering 1.2V output with load regulation of 0.1–1 µV/µA and line regulation of 2–4.3 µV/V. Output noise is specified at 10µVp-p (0.1Hz–10Hz) and 400µVp-p (10Hz–10kHz).

Key Specifications

Pinout & Package

SOT23-3 package: 3-pin surface-mount plastic package (JEDEC MO-178AA), 1.75mm × 2.0mm footprint, 1.1mm height, lead pitch 0.95mm. RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with REF3012AIDBZR and ADR3412ARTZ-R7, the MAX6120ESA+T uniquely balances ±1% initial accuracy, <100ppm/°C tempco, and sub-70µA supply current - making it optimal for long-life, battery-powered 12–16-bit measurement systems where both precision and micropower are mandatory.

Availability

MAX6120ESA+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test meters, and smart energy meters requiring stable component supply across extended production lifecycles.

Supply support for MAX6120ESA+T 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 demanding industrial, automotive, and communications applications.

The MAX6120ESA+T belongs to Maxim's precision voltage reference product line, engineered specifically for ultra-low-power, high-accuracy reference needs in battery-constrained measurement and sensing systems.

FAQ

What is the maximum input voltage rating for the MAX6120ESA+T?

The MAX6120ESA+T has an absolute maximum supply voltage (VIN) rating of +12V. Operation above this level risks permanent damage. For reliable long-term performance, the recommended operating range is 2.4V to 11V per the datasheet specifications. The MAX6120ESA+T includes internal protection against short-circuit conditions at VOUT, supporting continuous short-to-ground or short-to-VIN events without failure.

Does the MAX6120ESA+T require an input bypass capacitor?

Yes - a 0.1µF ceramic capacitor placed close to the VIN pin significantly improves line-transient response and PSRR, especially in battery-powered systems with variable load currents. While the MAX6120ESA+T functions without it, omitting the capacitor degrades rejection of supply ripple above 10kHz. The MAX6120ESA+T datasheet explicitly recommends this decoupling for all precision applications.

Can the MAX6120ESA+T drive capacitive loads?

The MAX6120ESA+T is stable with output capacitive loads up to 10nF. Exceeding this value may cause oscillation or degraded transient response. If larger capacitance is needed (e.g., for charge reservoir in DAC reference paths), a series isolation resistor (typically 1–10Ω) should be added between VOUT and the capacitor. This constraint is documented in the MAX6120ESA+T Applications Information section.

What is the guaranteed temperature coefficient for the MAX6120ESA+T over its full operating range?

The MAX6120ESA+T guarantees a temperature coefficient of less than 100ppm/°C over the full –40°C to +85°C operating temperature range. This specification applies specifically to the SOT23-3 package variant (MAX6120ESA+T). Typical performance is 30ppm/°C, but design margining must use the guaranteed 100ppm/°C limit to ensure system accuracy compliance.

How does the MAX6120ESA+T differ from two-terminal shunt references in terms of power efficiency?

Unlike two-terminal shunt references that waste current through an external series resistor and draw load-dependent current, the MAX6120ESA+T draws only 50µA typical supply current - independent of input voltage and load. This eliminates resistor power loss and enables direct connection to battery rails, improving end-to-end efficiency by up to 40% in 3V battery systems. The MAX6120ESA+T achieves this via its 3-terminal series architecture.