Analog Devices Inc./Maxim Integrated MAX6133BASA25+

Overview

The MAX6133BASA25+ from Maxim Integrated is a precision series-mode voltage reference delivering 2.500V output with ±0.08% initial accuracy, 5ppm/°C max temperature coefficient (−40°C to +125°C), and 200mV max dropout voltage. It operates from 2.7V to 12.6V supply, draws only 40µA quiescent current, and supports up to 15mA source current - ideal for high-accuracy ADC/DAC biasing in battery-powered instrumentation.

For engineers reviewing the MAX6133BASA25+ datasheet, MAX6133BASA25+ pinout, MAX6133BASA25+ application, or MAX6133BASA25+ equivalent, key selection criteria include guaranteed initial accuracy under extended temperature range, low-noise performance (16µV_P-P, 0.1Hz–10Hz), load regulation (0.05mV/mA max), and SO-8 package compatibility with space-constrained industrial and portable designs.

Technical Context

This series-mode bandgap reference uses laser-trimmed thin-film resistors and post-package trimming to achieve tight initial accuracy and low thermal drift. Its architecture eliminates external resistive dividers and enables direct connection to precision converters without gain error amplification.

It features internal compensation for stable operation with 0.1µF–100µF output capacitance, delivers 0.01% settling in ≤500µs, and maintains line regulation of ≤30µV/V across its full input range - critical for systems where supply rails vary dynamically during operation.

Key Specifications

Pinout & Package

MAX6133BASA25+ is housed in an 8-pin SO (SOIC-N) package per JEDEC MS-012, with 150-mil body width, 1.27mm pitch, and gull-wing leads. Pin 1 is marked by notch or dot; pins 1, 3, and 7 are no-connect (NC); pins 5 and 8 are internally connected (I.C.) and must remain unconnected externally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR3425ARJZ-R7, the MAX6133BASA25+ uniquely balances 5ppm/°C tempco, 0.08% accuracy, 40µA I_Q, and SO-8 manufacturability - making it optimal for cost-sensitive industrial field instruments needing robustness across extended temperature.

Availability

MAX6133BASA25+ is available at Aetrix Electronics and suitable for precision regulators, A/D and D/A converters, and high-accuracy industrial process control requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6133BASA25+ 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 MAX6133 series was developed specifically for high-stability, low-power voltage referencing in portable test equipment and distributed control systems - emphasizing accuracy retention over temperature, minimal supply overhead, and SO-8 manufacturability.

FAQ

What is the maximum load current supported by the MAX6133BASA25+?

The MAX6133BASA25+ supports up to 15mA of output source current while maintaining specified accuracy and regulation. This is confirmed in the Electrical Characteristics table under "Output Source-Current Capability" and validated across −40°C to +125°C. Exceeding 15mA may degrade output voltage accuracy and increase dropout voltage beyond the 200mV maximum specification.

Does the MAX6133BASA25+ require an input capacitor?

The MAX6133BASA25+ does not require an input capacitor for basic operation, but a 0.1µF ceramic capacitor placed close to the IN pin is recommended for optimal line-transient performance, as stated in the Applications Information section. Without it, line regulation degrades under fast supply transients, potentially causing temporary reference deviation exceeding 30µV/V.

What is the thermal hysteresis specification for the MAX6133BASA25+?

The MAX6133BASA25+ exhibits 120ppm thermal hysteresis - defined as the change in output voltage at +25°C before and after cycling between −40°C and +125°C. This value is identical for both SO and µMAX packages and is measured per Note 3 in the datasheet; it represents a non-recoverable offset shift due to package stress on the bandgap core.

Can the MAX6133BASA25+ be used with output capacitance greater than 0.1µF?

Yes, the MAX6133BASA25+ is stable with output capacitance ranging from 0.1µF to 100µF, including ceramic, tantalum, and electrolytic types. Larger capacitors (e.g., 10µF) improve transient response to load steps, as shown in the LOAD TRANSIENT plots (toc13–toc16), but do not affect DC accuracy or noise performance.

Is the MAX6133BASA25+ pin-compatible with other grades in the MAX6133 family?

Yes, all MAX6133 variants - including MAX6133AASA25+, MAX6133BASA25+, and MAX6133A_25 in µMAX - share identical SO-8 pinouts and terminal functions. The differences lie solely in initial accuracy (0.04%/0.08%), tempco (3ppm/°C vs. 5ppm/°C), and package type - allowing drop-in replacement where performance margins permit.