Analog Devices Inc./Maxim Integrated MAX6133A50

Overview

The MAX6133A50 from Maxim Integrated is a high-precision, low-power, low-dropout series voltage reference delivering 5.000V output with ±0.04% initial accuracy (A-grade SO package), 3ppm/°C max temperature coefficient, and 200mV max dropout voltage. It operates from 5.2V to 12.6V input, supplies up to 15mA load current, and targets precision analog signal chains in portable instrumentation and industrial data acquisition.

For engineers reviewing the MAX6133A50 datasheet, MAX6133A50 pinout, MAX6133A50 application, or MAX6133A50 equivalent, this page delivers verified electrical specs, package mapping, real-world use cases, and validated alternative options - all specific to the 5V A-grade SO variant.

Technical Context

The MAX6133A50 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 over –40°C to +125°C. Its 40µA quiescent current remains stable across supply voltage, enabling battery-sensitive designs.

It features guaranteed line regulation (≤50µV/V) and load regulation (≤0.10mV/mA) under full 15mA sourcing, with 0.1Hz–10Hz output noise of 40µV_P-P. The device requires only a 0.1µF output capacitor and supports capacitive loads up to 100µF for transient robustness.

Key Specifications

Pinout & Package

MAX6133A50 is packaged in an 8-pin SO (SOICN) surface-mount package measuring 4.90mm × 3.90mm × 1.75mm (max height). Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4550BRZ and REF5050AIDR, the MAX6133A50 uniquely balances ultra-low quiescent current (40µA), low dropout (200mV), and A-grade accuracy (±0.04%) - making it optimal for portable, loop-powered, and thermally constrained precision systems where power and headroom are critical.

Availability

MAX6133A50 is available at Aetrix Electronics and suitable for portable instrumentation, industrial 4–20mA transmitters, and medical front-end modules requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for MAX6133A50 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 MAX6133A50 belongs to Maxim's high-accuracy series voltage reference family, engineered specifically for low-power, low-dropout operation in portable and thermally variable environments where stability and efficiency are co-critical.

FAQ

What is the maximum load current supported by the MAX6133A50?

The MAX6133A50 guarantees stable operation with up to 15mA source current. Load regulation is specified at ≤0.10mV/mA across this range, and dropout voltage remains ≤200mV at 10mA. Exceeding 15mA may degrade accuracy or cause thermal shutdown; for higher current needs, consider adding an external buffer amplifier to the MAX6133A50 output.

Does the MAX6133A50 require an input bypass capacitor?

Yes - a 0.1µF ceramic capacitor is recommended between IN and GND, placed as close as possible to the MAX6133A50 pins. This minimizes line-transient errors and improves PSRR, especially above 10kHz. While the MAX6133A50 can operate without it under static conditions, omitting the capacitor risks instability during supply ripple or fast load steps.

Can the MAX6133A50 be used with a 5.0V supply rail?

No - the MAX6133A50 requires a minimum input voltage of 5.2V (per datasheet VIN specification for 5.0V output) to maintain regulation. With a 5.0V supply, the device operates below dropout threshold and cannot sustain 5.000V output. A minimum 5.2V supply (e.g., 5.25V LDO or boosted rail) is mandatory for full-spec performance.

What is the thermal hysteresis specification for the MAX6133A50?

The MAX6133A50 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 represents non-recoverable mechanical stress effects in the bandgap core, independent of tempco drift.

Is the MAX6133A50 pin-compatible with other MAX6133 variants?

Yes - all MAX6133 variants (including MAX6133A25, MAX6133A30, MAX6133A41, and MAX6133A50) share identical 8-pin SO and µMAX footprints and pinouts. Only the output voltage and grade-specific parameters (initial accuracy, tempco) differ; no PCB redesign is needed when substituting within the same package type.