Analog Devices Inc./Maxim Integrated MAX6225BESA

Overview

MAX6225BESA from Maxim Integrated is a precision 2.500V buried-zener voltage reference with ±0.02% initial accuracy, 7.0ppm/°C max temperature coefficient over –40°C to +85°C, and 1.5µV_P-P (0.1Hz–10Hz) output noise-designed for high-resolution ADC/DAC biasing in metrology-grade instrumentation.

For engineers reviewing the MAX6225BESA datasheet, MAX6225BESA pinout, MAX6225BESA application, or MAX6225BESA equivalent, key selection criteria include long-term stability (20ppm/1000h), ±15mA sourcing/sinking capability, low 18mW power consumption, and compatibility with capacitive loads up to 100µF without oscillation.

Technical Context

The MAX6225BESA employs buried-zener core technology with on-chip temperature compensation to achieve near-zero thermal curvature across its –40°C to +85°C operating range. Its internal architecture supports simultaneous noise reduction (via NR pin capacitor) and external output trimming (via TRIM pin) without degrading temperature stability.

It delivers stable 2.500V output under input voltages from 8V to 36V, maintains ±1ppm/mA load regulation (sourcing), and exhibits <5µs turn-on settling to ±0.01%-enabling use in fast-cycling precision data acquisition systems where reference integrity must be preserved during dynamic load transitions.

Key Specifications

Pinout & Package

MAX6225BESA is housed in an 8-pin SO (Small Outline) package with industry-standard footprint (S8+5, outline 21-0041), RoHS-compliant, and rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR441BRZ, the MAX6225BESA offers superior ±15mA bidirectional drive, wider 8V–36V input range, and integrated NR pin for configurable noise suppression-making it optimal for industrial DAQ and ATE systems demanding robustness, flexibility, and long-term stability over raw noise floor minimization.

Availability

MAX6225BESA is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, digital multimeters, and industrial process controllers requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6225BESA 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 semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, medical, and test equipment markets.

The MAX6225BESA belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade instrumentation where long-term drift, low noise, and temperature stability are non-negotiable design constraints.

FAQ

What is the maximum operating temperature range for the MAX6225BESA?

The MAX6225BESA is rated for continuous operation from –40°C to +85°C, as indicated by the "E" grade suffix in its ordering code. This extended industrial temperature range ensures reliable performance in harsh environments such as factory-floor PLC modules and portable field test instruments where ambient temperatures fluctuate widely. The device maintains its specified 7.0ppm/°C max temperature coefficient and 20ppm/1000h long-term stability within this range.

Can the MAX6225BESA drive a 100µF output capacitor without instability?

Yes, the MAX6225BESA is explicitly characterized and guaranteed stable with output capacitance ranging from 0µF to 100µF across all load currents and temperatures. This eliminates the need for series isolation resistors or complex compensation networks typically required with other references. The internal design incorporates phase-margin optimization that accommodates large capacitive loads-making it ideal for applications requiring low-noise filtering or transient energy storage at the reference node, such as high-speed data acquisition front-ends.

How does the NR pin function on the MAX6225BESA?

The NR (Noise Reduction) pin on the MAX6225BESA accepts an optional 1µF capacitor to ground, which significantly attenuates wideband output noise-particularly above 10Hz-without altering DC accuracy or temperature behavior. Adding this capacitor reduces RMS noise by up to 10dB in the 10Hz–1kHz band, as verified in the device's Typical Operating Characteristics. Leaving NR open retains full bandwidth but increases susceptibility to supply-induced noise; the feature provides system-level flexibility without requiring external op-amps or filters.

What is the trim-adjustment range supported by the MAX6225BESA?

The MAX6225BESA supports ±15mV (±0.6%) output voltage adjustment via its TRIM pin using a standard 10kΩ potentiometer connected between OUT and GND, with the wiper feeding TRIM. This range allows precise system-level calibration to compensate for PCB trace resistance, ADC offset, or sensor gain errors-while preserving the device's specified ±0.02% initial accuracy and 7.0ppm/°C temperature coefficient. No additional components or power are required for trimming, and the adjustment remains stable over temperature and time.

Is the MAX6225BESA compatible with lead-free reflow soldering processes?

Yes, the MAX6225BESA carries the "+" suffix (MAX6225BESA+), indicating it is supplied in a RoHS-compliant, lead(Pb)-free package. It is qualified for standard Pb-free reflow profiles with peak temperatures up to +260°C for 10 seconds, matching JEDEC J-STD-020 specifications for SO-8 packages. The device's plastic SO construction and internal metallurgy have been validated for thermal cycling reliability under lead-free assembly conditions, ensuring mechanical and electrical integrity post-reflow.