Analog Devices Inc./Maxim Integrated MAX6350MJA

Overview

MAX6350MJA from Maxim Integrated is a precision 5.000V buried-zener voltage reference with ±0.02% initial accuracy, 2.5ppm/°C max temperature coefficient over –55°C to +125°C, and ±15mA output sourcing/sinking capability-designed for high-resolution ADC/DAC biasing in aerospace and military-grade instrumentation.

For engineers reviewing the MAX6350MJA datasheet, MAX6350MJA pinout, MAX6350MJA application, or MAX6350MJA equivalent, key selection criteria include its CERDIP-8 hermetic package, low 3.0mA supply current at +25°C, 10µs turn-on settling time to ±0.01%, and guaranteed long-term stability of 30ppm/1000hr-critical for calibration-critical and extended-life embedded systems.

Technical Context

The MAX6350MJA employs buried-zener core technology with on-chip temperature compensation to achieve ultra-low drift across its full military temperature range (–55°C to +125°C). Its output voltage is trimmed at wafer level and supports optional external adjustment via the TRIM pin for ±30mV (±0.6%) fine-tuning without degrading tempco performance.

It features dual noise-reduction paths: internal wideband filtering and an external NR pin accepting up to 1µF capacitor for sub-10Hz noise suppression. Output impedance remains below 1Ω up to 10kHz, enabling stable operation into capacitive loads from 0µF to 100µF while maintaining <500µV load-transient deviation during ±10mA steps.

Key Specifications

Pinout & Package

MAX6350MJA is housed in an 8-pin hermetic CERDIP package (0.300" wide), rated for –55°C to +125°C operation and qualified per MIL-STD-883. Pins 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 REF5050IDR and ADR4550BRZ, the MAX6350MJA uniquely delivers military-grade temperature range (–55°C to +125°C), hermetic CERDIP packaging, external trim capability, and 30ppm/1000hr stability-making it the only choice for systems requiring traceable calibration over decades in extreme environments.

Availability

MAX6350MJA is available at Aetrix Electronics and suitable for aerospace telemetry, military-grade DVMs, downhole sensing, and avionics flight control systems requiring stable component supply across extended temperature ranges and long service lifetimes.

Supply support for MAX6350MJA 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 in demanding environments.

The MAX63xx family targets ultra-stable voltage references for metrology, defense, and energy exploration-where buried-zener architecture, hermetic packaging, and multi-decade stability are non-negotiable design requirements.

FAQ

What is the maximum operating temperature range for the MAX6350MJA?

The MAX6350MJA is rated for continuous operation from –55°C to +125°C, validated per MIL-STD-883 methods. This full military temperature range is enabled by its hermetic CERDIP-8 package and on-die temperature compensation circuitry. The 2.5ppm/°C max tempco specification applies across this entire range, making MAX6350MJA suitable for downhole, avionics, and space applications where ambient extremes are routine.

Does the MAX6350MJA require an external capacitor on the NR pin?

No, the NR pin on the MAX6350MJA is optional: it accepts a 1µF capacitor to reduce 0.1Hz–10Hz output noise by ~50%, but the device operates fully specified with NR left open. The 1.5µV_p-p (0.1Hz–10Hz) noise spec is guaranteed with NR open; adding the capacitor improves noise to ~0.75µV_p-p. No other capacitor values are recommended-larger values yield diminishing returns per Maxim's Typical Operating Characteristics.

Can the MAX6350MJA drive a 100µF output capacitor?

Yes, the MAX6350MJA is explicitly characterized and guaranteed stable with output capacitive loads from 0µF to 100µF across all load currents (±15mA) and temperatures (–55°C to +125°C). This eliminates the need for series isolation resistors or stability-compensation networks in PCB layout-unlike many bandgap references that oscillate or exhibit peaking with >1µF loads. The internal compensation ensures monotonic phase margin across the full capacitance range.

What is the purpose of the TRIM pin on the MAX6350MJA?

The TRIM pin on the MAX6350MJA allows ±30mV (±0.6%) external adjustment of the 5.000V output using a 10kΩ potentiometer connected between OUT and GND, with the wiper to TRIM. This feature enables field recalibration or system-level gain trimming without degrading the device's ±0.02% initial accuracy or 2.5ppm/°C tempco. TRIM is fully functional across the –55°C to +125°C range and requires no additional components beyond the potentiometer.

How does the MAX6350MJA compare to the MAX6350ESA in terms of long-term stability?

The MAX6350MJA guarantees 30ppm/1000hr long-term stability, identical to the MAX6350ESA (–40°C to +85°C, SOIC-8). Both share the same buried-zener die and trimming methodology. However, the MAX6350MJA's CERDIP-8 hermetic package provides superior moisture and contaminant barrier properties versus the ESA's plastic SOIC, which contributes to equivalent or better actual field stability in harsh environments-especially where thermal cycling or humidity exposure is present.