Analog Devices Inc./Maxim Integrated MAX6350CPA

Overview

MAX6350CPA from Maxim Integrated is a precision 5.000V voltage reference IC using buried-zener technology, delivering ±0.02% initial accuracy, 0.5ppm/°C typical temperature coefficient, and 3.0µV_p-p (0.1Hz–10Hz) output noise. It operates from 8V to 36V input, supplies ±15mA load current, and targets high-resolution data-conversion systems up to 16 bits.

For engineers reviewing the MAX6350CPA datasheet, MAX6350CPA pinout, MAX6350CPA application, or MAX6350CPA equivalent, key selection criteria include its 5V output stability under varying line/load conditions, optional external trim capability, low-noise performance in precision ADC/DAC biasing, and compatibility with capacitive loads up to 100µF without oscillation.

Technical Context

The MAX6350CPA employs a temperature-compensated buried-zener core to achieve laboratory-grade stability without heater power, yielding a near-flat ∆V_OUT/T curve across –40°C to +85°C. Its internal architecture supports simultaneous sourcing and sinking of ±15mA while maintaining <10ppm/mA load regulation and <18ppm/V line regulation.

It integrates dedicated NR and TRIM pins: NR accepts a 1µF capacitor for wideband noise reduction (reducing 0.1Hz–10Hz noise by ~30%), and TRIM enables ±30mV (±0.6%) output adjustment via external potentiometer without degrading tempco or long-term drift.

Key Specifications

Pinout & Package

MAX6350CPA is housed in an 8-pin plastic DIP package (0°C to +70°C industrial temperature grade), with 0.3-inch body width and through-hole mounting. 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 REF5050AIDR and ADR4550BRZ, the MAX6350CPA uniquely combines 5V precision, wide 8–36V input support, ±15mA drive, and field-adjustable TRIM-making it optimal for industrial DAQ systems where supply rails vary and calibration flexibility is required.

Availability

MAX6350CPA is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, precision current sources, digital voltmeters, ATE equipment, and industrial process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6350CPA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX63xx family was designed specifically for metrology-grade voltage references in high-accuracy instrumentation, offering buried-zener stability with integrated noise reduction and trimming-distinct from bandgap-based alternatives.

FAQ

What is the maximum input voltage rating for MAX6350CPA?

The MAX6350CPA has an absolute maximum input voltage rating of 40V referenced to GND. However, its specified operational input range is 8V to 36V. Operating above 36V risks exceeding safe power dissipation limits and may degrade long-term stability-even if within absolute ratings-so design margins should maintain VIN ≤36V under all conditions including transients.

Does MAX6350CPA require an output capacitor to remain stable?

No, the MAX6350CPA is explicitly characterized and guaranteed stable with output capacitance ranging from 0µF to 100µF across all load currents. Unlike many references, it does not require a minimum output capacitor for phase margin; adding one (e.g., 10µF tantalum) only improves transient response and reduces high-frequency noise-not stability.

Can the TRIM pin of MAX6350CPA be left floating?

Yes, the TRIM pin of MAX6350CPA may be left unconnected (open) with no adverse effect on performance. When unused, the device delivers its nominal 5.000V output with ±0.02% initial accuracy and full tempco specification. External trimming is optional and only needed for system-level calibration adjustments.

What is the turn-on settling time specification for MAX6350CPA?

The MAX6350CPA has a turn-on settling time of 10µs to within ±0.01% of final output value under typical conditions (VIN = 10V, C_OUT = C_NR = 0µF). This fast settling supports high-throughput data acquisition systems where reference stabilization must occur between successive channel conversions.

Is MAX6350CPA compatible with the same PCB footprint as MAX6325CPA or MAX6341CPA?

Yes, MAX6350CPA shares identical pin configuration, electrical behavior, and 8-pin plastic DIP package dimensions with MAX6325CPA and MAX6341CPA. All three devices use the same pinout (IN, NR, TRIM, GND, TRIM, OUT, I.C., I.C.) and mechanical outline-enabling drop-in replacement across the MAX6325/MAX6341/MAX6350 family when only output voltage differs.