Analog Devices Inc./Maxim Integrated MAX6133A25+

Overview

The MAX6133A25+ from Maxim Integrated is a high-precision, low-power, low-dropout series voltage reference delivering 2.500V output with ±0.04% (max) initial accuracy, 3ppm/°C (max) temperature coefficient over –40°C to +125°C, and 200mV (max) dropout voltage at 10mA load - enabling stable precision biasing in battery-powered instrumentation and portable ADC/DAC systems.

For engineers reviewing the MAX6133A25+ datasheet, MAX6133A25+ pinout, MAX6133A25+ application, or MAX6133A25+ equivalent, this page provides verified electrical specifications, SO package terminal mapping, real-world noise and regulation performance, and validated alternative options for high-accuracy analog signal chains.

Technical Context

The MAX6133A25+ employs bandgap-based series-mode architecture with laser-trimmed thin-film resistors and post-package trimming to achieve 0.04% initial accuracy and 3ppm/°C tempco. Its 40µA quiescent current remains virtually supply-voltage-independent, minimizing power loss in low-voltage systems.

It delivers 15mA source capability with guaranteed load regulation of 0.05mV/mA (max) and line regulation of 30µV/V (max), operating across a 2.7V–12.6V input range while maintaining 16µV_P-P (0.1Hz–10Hz) output noise - critical for 14-bit+ data converters requiring sub-LSB drift stability.

Key Specifications

Pinout & Package

MAX6133A25+ is supplied in an 8-pin SO (SOICN) package measuring 4.90mm × 3.90mm × 1.50mm (max), with gull-wing leads, 1.27mm pitch, and RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3425ARJZ-R7, MAX6133A25+ trades 55µA higher quiescent current for 2.5× better initial accuracy and 1.5× higher output drive. Against REF5025IDR, it achieves 23× lower I_Q at identical tempco and SO-8 compatibility, accepting slightly higher long-term drift.

Availability

MAX6133A25+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial process transmitters, medical monitoring devices, and test & measurement DAQ systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6133A25+ 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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6133A25+ belongs to Maxim's high-accuracy series voltage reference product line, engineered specifically for portable and battery-powered systems where low dropout, ultra-low quiescent current, and tight initial accuracy are mandatory.

FAQ

What is the maximum load current supported by the MAX6133A25+?

The MAX6133A25+ guarantees 15mA output source current capability across its full operating temperature range (–40°C to +125°C). Load regulation is specified at 0.05mV/mA (max), meaning output voltage shifts by no more than 0.75mV under full 15mA load - sufficient to drive multiple ADC references or op-amp bias networks without external buffering. This rating is confirmed in the Electrical Characteristics table for MAX6133_25 under "Output Source-Current Capability".

Does the MAX6133A25+ require an input bypass capacitor?

Yes - the MAX6133A25+ requires a 0.1µF ceramic capacitor placed directly between the IN pin and GND for optimal line-transient performance. The datasheet explicitly states this in the Applications Information section: "For the best line-transient performance, decouple the input with a 0.1µF ceramic capacitor… Place the capacitor as close to IN as possible." Omitting it degrades PSRR and increases susceptibility to supply ripple, especially above 10kHz.

What is the thermal hysteresis specification for the MAX6133A25+?

The MAX6133A25+ exhibits 120ppm thermal hysteresis - defined as the change in output voltage at +25°C before and after cycling from –40°C to +125°C. This value is identical for both SO and µMAX packages and appears in the Electrical Characteristics tables under "Thermal Hysteresis (Note 3)". It reflects mechanical stress-induced bandgap core shifts and is independent of tempco or initial accuracy.

Can the MAX6133A25+ be used with a 2.7V supply?

Yes - the MAX6133A25+ operates with a minimum input voltage of 2.7V, as confirmed in the "Input Voltage Range" specification (2.7V to 12.6V) for the 2.5V output variant. At 2.7V input and 10mA load, the 200mV (max) dropout ensures stable 2.5V output. This makes the MAX6133A25+ compatible with single-cell Li-ion (nominal 3.7V, discharge to 2.7V) and alkaline (3.2V fresh, ~2.8V end-of-life) supplies without pre-regulation.

Is the MAX6133A25+ pin-compatible with other MAX6133 variants?

Yes - all MAX6133 variants (including MAX6133A30+, MAX6133A41+, MAX6133A50+) share identical 8-pin SO package footprints and pinouts. The only differences are output voltage (determined by suffix: 25=2.5V, 30=3.0V, etc.) and grade-specific parameters (e.g., tempco and accuracy). Pin functions - IN (pin 2), GND (pin 4), OUT (pin 6), N.C. (pins 1/3/7), I.C. (pins 5/8) - remain unchanged across the family.