Analog Devices Inc./Maxim Integrated MAX6341CPA

Overview

MAX6341CPA from Maxim Integrated is a precision 4.096V voltage reference IC using buried-zener technology, delivering ±0.02% initial accuracy, 0.5ppm/°C typical temperature coefficient, and 2.4µV_p-p (0.1Hz–10Hz) output noise. It supports ±15mA source/sink current, operates from 8V to 36V input, and is optimized for 16-bit high-resolution ADC/DAC reference applications in industrial instrumentation.

For engineers reviewing the MAX6341CPA datasheet, MAX6341CPA pinout, MAX6341CPA application, or MAX6341CPA equivalent, key selection criteria include its 4.096V output matching standard DAC full-scale ranges, low 1.0ppm/°C max tempco over 0°C to +70°C, optional external trim capability, and stability with capacitive loads up to 100µF without compensation.

Technical Context

The MAX6341CPA implements a precision buried-zener core with proprietary low-power temperature compensation, achieving near-zero curvature across its operating range. Its output stage provides robust load regulation (±5ppm/mA) and low dynamic output impedance (<1Ω at 1kHz), enabling stable operation under fast load transients.

It features dedicated NR (noise reduction) and TRIM pins: the NR pin accepts a 1µF capacitor to reduce wideband noise by >20dB, while the TRIM pin allows ±24mV adjustment (±0.59%) via external potentiometer without degrading temperature stability or long-term drift.

Key Specifications

Pinout & Package

MAX6341CPA is housed in an 8-pin plastic DIP package (0.300" width), compatible with through-hole prototyping and legacy industrial PCBs. Pin 1, 7, and 8 are internally connected and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5040AIDR and ADR444BRZ, the MAX6341CPA offers superior temperature stability (1.0ppm/°C vs. ≥1.5ppm/°C), lower noise (2.4µV_p-p), and direct ±15mA drive-making it optimal for high-accuracy, high-reliability industrial and metrology applications where long-term calibration integrity is mandatory.

Availability

MAX6341CPA is available at Aetrix Electronics and suitable for high-resolution data acquisition, digital voltmeters, industrial process controllers, and ATE equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6341CPA 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 industrial, automotive, and communications markets.

The MAX63xx family was engineered specifically for metrology-grade voltage reference applications demanding laboratory-level stability, ultra-low noise, and field-deployable reliability in harsh environments.

FAQ

What is the maximum operating temperature range for the MAX6341CPA?

The MAX6341CPA is rated for operation from 0°C to +70°C, as indicated by the 'C' suffix in its ordering code. This commercial temperature grade is validated per Maxim's datasheet specifications, including tempco, initial accuracy, and long-term stability, across the full 0°C to +70°C range. The MAX6341CPA is not specified for extended temperature operation beyond this range.

Does the MAX6341CPA require an external capacitor on the NR pin for basic operation?

No, the MAX6341CPA operates fully functional with the NR pin left open. The 1µF capacitor on the NR pin is optional and used solely to reduce wideband output noise by approximately 40% in the 0.1Hz–10Hz band. Leaving NR unconnected incurs no performance penalty to accuracy, stability, or regulation-only the baseline 2.4µV_p-p noise remains.

Can the MAX6341CPA drive a 10kΩ load directly without external buffering?

Yes, the MAX6341CPA can directly drive a 10kΩ load. With ±15mA output capability and <1Ω dynamic output impedance, it delivers full 4.096V accuracy into loads as low as 273Ω (4.096V ÷ 15mA). A 10kΩ load draws only 410µA, well within specification and causing negligible voltage droop (<0.002% based on load regulation of ±5ppm/mA).

What is the purpose of the TRIM pin on the MAX6341CPA, and how much adjustment does it provide?

The TRIM pin on the MAX6341CPA allows external fine-tuning of the output voltage using a potentiometer between OUT and GND. It provides a ±24mV adjustment range (±0.59% of 4.096V), enabling system-level calibration to compensate for downstream errors. Critically, this trimming does not degrade the device's temperature coefficient or long-term stability, as confirmed in the datasheet's Detailed Description section.

Is the MAX6341CPA pin-compatible with other members of the MAX63xx family, such as the MAX6325CPA or MAX6350CPA?

Yes, the MAX6341CPA shares identical pinout, package (8-pin PDIP), and terminal functions with the MAX6325CPA and MAX6350CPA. All three devices use the same IN, GND, NR, OUT, TRIM, and internally connected pins (1, 7, 8). This allows direct substitution in hardware layouts when changing reference voltage from 2.5V or 5.0V to 4.096V-no PCB redesign is needed.