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 1.5µV_p-p (0.1Hz–10Hz) output noise. It sources/sinks ±15mA, supports external trimming and noise reduction, and is optimized for high-resolution ADC/DAC systems requiring stable, low-drift references.

For engineers reviewing the MAX6341CPA+ datasheet, MAX6341CPA+ pinout, MAX6341CPA+ application, or MAX6341CPA+ equivalent, this device is selected for its ultra-low tempco, sub-2µV_p-p noise floor, 8-pin PDIP package compatibility, and guaranteed load regulation up to ±15mA in 0°C to +70°C industrial environments.

Technical Context

The MAX6341CPA+ employs a buried-zener core with proprietary low-power temperature compensation, achieving near-zero curvature over –40°C to +85°C. Its output is internally buffered and stable with capacitive loads from 0µF to 100µF without oscillation.

It features dedicated NR and TRIM pins enabling optional 1µF noise-reduction capacitance and ±24mV (±0.59%) external adjustment-both functions fully decoupled from temperature stability performance. Input voltage range is 8V to 36V, with supply current of 1.9mA (typ) at +25°C.

Key Specifications

Pinout & Package

MAX6341CPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, through-hole mounting, and industry-standard footprint compatible with legacy socketed reference designs.

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+ provides superior tempco (1.0ppm/°C max), lower noise (1.5µV_p-p), full ±15mA drive, and dual NR/TRIM flexibility - making it optimal for calibration-critical, high-current, low-noise instrumentation where design margin matters.

Availability

MAX6341CPA+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, digital voltmeters, precision current sources, ATE equipment, and metrology instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

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 precision, power, and interface applications.

The MAX63xx family was engineered specifically for metrology-grade voltage reference needs - prioritizing ultra-low drift, sub-microvolt noise, and robust load/transient behavior in industrial and test equipment.

FAQ

What is the maximum load current the MAX6341CPA+ can source or sink while maintaining specification?

The MAX6341CPA+ is specified to source and sink up to ±15mA while maintaining all electrical parameters within datasheet limits, including load regulation of ±5ppm/mA and output voltage accuracy. This capability allows direct driving of op-amp inputs, DAC references, and moderate-current calibration circuits without external buffers - critical for compact, high-accuracy signal chains where the MAX6341CPA+ serves as the foundational voltage standard.

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

No, the NR pin on the MAX6341CPA+ is optional: leaving it open enables standard operation. A 1µF capacitor may be added to reduce wideband noise by ~25dB, but it is not required for functionality or stability. The MAX6341CPA+ remains fully operational and meets all specifications - including 1.5µV_p-p low-frequency noise - with NR unconnected, making it flexible for both noise-sensitive and space-constrained designs.

Can the output voltage of the MAX6341CPA+ be adjusted, and if so, what is the adjustment range?

Yes, the MAX6341CPA+ supports external output adjustment via the TRIM pin: connecting a 10kΩ potentiometer between OUT and GND, with its wiper to TRIM, enables ±24mV (±0.59%) output variation around 4.096V. This adjustment does not degrade temperature coefficient or long-term stability, allowing system-level calibration without compromising the MAX6341CPA+'s core precision attributes in field-deployed instrumentation.

What is the input voltage range for the MAX6341CPA+, and how does line regulation perform across that range?

The MAX6341CPA+ operates from 8V to 36V input, with line regulation specified at 10ppm/V - meaning output voltage changes by no more than 41µV per volt of input variation. This tight regulation ensures consistent 4.096V reference accuracy even with unregulated industrial supplies or aging batteries, directly supporting robust performance of the MAX6341CPA+ in variable-input environments like portable test gear and factory-floor controllers.

Is the MAX6341CPA+ stable with large output capacitors, and why does that matter in practical designs?

Yes, the MAX6341CPA+ is explicitly characterized and guaranteed stable with output capacitance from 0µF to 100µF across all load currents - eliminating need for series isolation resistors. This matters because large bypass caps (e.g., 10µF–47µF tantalum or ceramic) suppress high-frequency noise and transient glitches in dense PCB layouts, enabling reliable MAX6341CPA+ integration into noisy industrial systems without risk of oscillation or degraded settling time.