Analog Devices Inc./Maxim Integrated MAX6350CSA

Overview

MAX6350CSA 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 sources/sinks ±15mA, operates from 8V to 36V input, and targets high-resolution data-conversion systems up to 16 bits.

For engineers reviewing the MAX6350CSA datasheet, MAX6350CSA pinout, MAX6350CSA application, or MAX6350CSA equivalent, key selection criteria include its 5V output stability under load transients, optional external trimming capability, low-noise performance with NR-pin capacitor support, and compatibility with capacitive loads up to 100µF without oscillation.

Technical Context

The MAX6350CSA implements a temperature-compensated buried-zener core achieving laboratory-grade stability without heater power. Its trim-adjustment range of ±30mV (±0.6%) is implemented via an external potentiometer at the TRIM pin without degrading temperature coefficient.

Output noise is reduced by up to 50% using a 1µF capacitor on the NR pin, and the device maintains excellent transient response-settling to ±0.01% in 10µs-with stable operation across full load current (±15mA) and input voltage (8V–36V) ranges.

Key Specifications

Pinout & Package

MAX6350CSA is housed in an industry-standard 8-pin SO (SOIC) package, compatible with automated PCB assembly and offering thermal performance suitable for industrial ambient conditions.

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 MAX6350CSA offers superior low-frequency noise (3.0µV_p-p vs. ≥4.5µV_p-p) and higher output drive (±15mA vs. ≤±10mA), making it optimal for high-speed, high-precision data acquisition where both stability and dynamic load handling are critical.

Availability

MAX6350CSA is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, precision current sources, and digital voltmeters requiring stable component supply across industrial, test & measurement, and embedded instrumentation programs.

Supply support for MAX6350CSA 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 delivers laboratory-grade voltage references optimized for metrology, data acquisition, and calibration-critical systems where long-term stability and ultra-low noise are non-negotiable.

FAQ

What is the maximum load current the MAX6350CSA can source or sink while maintaining specification?

The MAX6350CSA is specified to source and sink up to ±15mA while maintaining all electrical parameters-including output voltage accuracy, noise, and regulation-within datasheet limits. This capability eliminates the need for external buffer amplifiers in many 5V reference applications, such as driving ADC reference inputs or precision DAC feedback networks. The MAX6350CSA sustains this performance across its full 0°C to +70°C operating temperature range and 8V–36V input voltage span.

Does the MAX6350CSA require an external capacitor on the NR pin to meet its noise specification?

No-the MAX6350CSA's 3.0µV_p-p (0.1Hz–10Hz) noise specification is guaranteed with CNR = 0µF. Adding a 1µF capacitor to the NR pin reduces low-frequency noise by approximately 50%, but is optional. The device remains fully functional and within all specifications-including initial accuracy and tempco-even with the NR pin left open. This flexibility allows designers to optimize for noise performance only where required.

Can the MAX6350CSA be used with large output capacitors, and what is the maximum supported value?

Yes-the MAX6350CSA is explicitly characterized and guaranteed stable with output capacitors ranging from 0µF to 100µF across all load currents (±15mA) and input voltages (8V–36V). This eliminates the need for series isolation resistors or complex compensation networks. The design accommodates ceramic, tantalum, and electrolytic capacitors, supporting robust filtering in noisy industrial environments without risk of oscillation or degraded transient response.

What is the purpose of the TRIM pin on the MAX6350CSA, and how much adjustment does it provide?

The TRIM pin on the MAX6350CSA enables external fine-tuning of the output voltage by ±30mV (±0.6% of 5V), achieved using a 10kΩ potentiometer between OUT and GND with its wiper connected to TRIM. This adjustment does not degrade the device's temperature coefficient or long-term stability. It is commonly used to compensate for system-level gain errors or to calibrate against a higher-accuracy standard during final test-without requiring rework of the reference circuit itself.

Is the MAX6350CSA pin-compatible with other members of the MAX63xx family, such as the MAX6325CSA or MAX6341CSA?

Yes-the MAX6350CSA shares identical pinout, package (8-pin SO), and terminal functions with the MAX6325CSA (2.5V) and MAX6341CSA (4.096V). All three devices use the same IN, GND, NR, TRIM, and OUT pin assignments and support identical external components (e.g., 1µF NR capacitor, 10kΩ trim pot). This allows designers to reuse PCB layouts across voltage variants, simplifying multi-voltage platform development and reducing qualification effort for reference subsystems.