Analog Devices Inc./Maxim Integrated MAX6250AEPA+

Overview

MAX6250AEPA+ from Maxim Integrated is a precision 5.000V buried-zener voltage reference IC with ±0.02% initial accuracy, 1.5ppm/°C max temperature coefficient (–40°C to +85°C), and 3.0µV_P-P (0.1Hz–10Hz) low-frequency noise-designed for high-resolution ADC/DAC biasing in metrology-grade instrumentation.

For engineers reviewing the MAX6250AEPA+ datasheet, MAX6250AEPA+ pinout, MAX6250AEPA+ application, or MAX6250AEPA+ equivalent, key selection criteria include output stability under capacitive loads up to 100µF, ±15mA sourcing/sinking capability, trim-adjustable output (±30mV), and compatibility with noise-reduction capacitor on NR pin.

Technical Context

The MAX6250AEPA+ uses buried-zener core technology with on-chip temperature compensation to achieve near-zero curvature over –40°C to +85°C, delivering laboratory-grade stability without heater power. Its low 20ppm/1000h long-term drift supports calibration-critical applications.

It features dual-path regulation: line regulation of ≤7ppm/V (10V–36V input) and load regulation of ≤7ppm/mA (sourcing), enabled by low-output-impedance design (<1Ω at 1kHz) and fast 10µs turn-on settling to ±0.01%.

Key Specifications

Pinout & Package

MAX6250AEPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1, 7, and 8 are internally connected and must remain unconnected in PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6250AEPA+, REF5050IDR offers smaller footprint but lower drive strength, while ADR4550BRZ delivers lower noise but lacks trim/noise-reduction flexibility-making MAX6250AEPA+ optimal for field-calibratable, high-drive industrial instrumentation.

Availability

MAX6250AEPA+ is available at Aetrix Electronics and suitable for digital voltmeters, 16-bit data acquisition systems, automated test equipment, precision current sources, and industrial process controllers requiring stable component supply across extended temperature ranges.

Supply support for MAX6250AEPA+ 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.

The MAX62xx family targets metrology-grade voltage references-engineered for ultra-low drift, low noise, and robustness in calibration-critical systems like ATE, DVMs, and industrial DAQ.

FAQ

What is the maximum capacitive load the MAX6250AEPA+ can drive stably?

The MAX6250AEPA+ remains stable with output capacitance from 0µF to 100µF across its full operating temperature range and load current (±15mA). This eliminates the need for series isolation resistors in buffered reference designs and supports direct connection to large decoupling caps on ADC reference pins-ensuring clean, glitch-free conversions even during dynamic load switching.

Does the MAX6250AEPA+ require an external noise-reduction capacitor to meet its specified 3.0µV_P-P noise?

No-the 3.0µV_P-P (0.1Hz–10Hz) noise specification for MAX6250AEPA+ is measured with NR pin open. Adding a 1µF capacitor to the NR pin further reduces wideband noise but does not affect the low-frequency spec. The device achieves its rated noise performance inherently via buried-zener architecture and on-die filtering, making it suitable for noise-sensitive applications even without external NR components.

Can the MAX6250AEPA+ be used with input voltages below 8V?

No-absolute minimum input voltage for MAX6250AEPA+ is 8V per the Absolute Maximum Ratings table. Operation below 8V risks loss of regulation, increased output drift, and potential instability. For lower-input applications, consider the MAX6126 series (2.5V/3.3V/5.0V, 5.5V min VIN), which maintains precision performance down to 5.5V input while retaining similar noise and tempco specs.

How does the TRIM pin on the MAX6250AEPA+ affect temperature coefficient?

The TRIM pin on MAX6250AEPA+ allows ±30mV (±0.6%) output adjustment via external 10kΩ potentiometer, but this adjustment has no effect on temperature coefficient. The buried-zener core and on-chip compensation network maintain the specified ≤3.0ppm/°C tempco across the entire trim range-verified in production testing-ensuring calibrated systems retain accuracy over temperature without re-trimming.

Is the MAX6250AEPA+ RoHS-compliant and lead-free?

Yes-MAX6250AEPA+ carries the "+" suffix per Maxim's ordering nomenclature, indicating full compliance with RoHS Directive 2011/65/EU and lead-free construction. The 8-pin plastic DIP package uses matte tin lead finish, with all homogeneous materials meeting Annex II substance restrictions, including <1000ppm lead content and absence of cadmium, hexavalent chromium, PBB, and PBDE.