Analog Devices Inc./Maxim Integrated MAX675ESA+T

Overview

MAX675ESA+T from Maxim Integrated is a precision +5V voltage reference IC with ±0.15% initial accuracy, 15ppm/°C temperature coefficient, and 10µV_P-P low-frequency noise (0.1Hz–10Hz), designed for high-accuracy analog signal conditioning in A/D and D/A converters, digital voltmeters, and threshold detectors.

For engineers reviewing the MAX675ESA+T datasheet, MAX675ESA+T pinout, MAX675ESA+T application, or MAX675ESA+T equivalent, key selection considerations include its narrow SO-8 package, -40°C to +85°C operating range, trim-adjustable output (±150mV), TEMP pin for absolute-temperature sensing (2.1mV/°C), and short-circuit protection with indefinite ground/V_IN fault tolerance.

Technical Context

The MAX675ESA+T implements a bandgap-based reference core with on-chip trimming for factory-set 5.000V output, supported by a dedicated TRIM pin enabling binary-aligned adjustments (e.g., 5.120V). Its TEMP pin delivers a linear 2.1mV/°C voltage proportional to absolute temperature (T + 273), usable for remote sensing without external components.

It operates from 15V input with 750–1400µA quiescent current, achieves 5µs turn-on settling to ±0.1%, and maintains 0.001%/mA load regulation and 0.01%/V line regulation - all while offering sink capability (0.5mA), short-circuit current limiting (30mA), and thermal-shock resilience per MIL-STD-883.

Key Specifications

Pinout & Package

MAX675ESA+T is housed in an 8-pin narrow SO (Small Outline) package, 3.9mm × 4.9mm body, 1.75mm height, with gull-wing leads and standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02CP and ADR445BRZ, the MAX675ESA+T uniquely combines factory-trimmed 5V accuracy, user-adjustable output, and integrated temperature sensing in a pin-compatible SO-8 package - making it optimal for space-constrained, multi-function analog subsystems where reference and sensor integration reduce BOM count and calibration complexity.

Availability

MAX675ESA+T is available at Aetrix Electronics and suitable for precision data acquisition, industrial calibration equipment, and embedded temperature-monitoring systems requiring stable component supply across extended temperature ranges.

Supply support for MAX675ESA+T 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 industrial, automotive, and communications applications, with emphasis on precision, power efficiency, and integration.

The MAX675ESA+T belongs to Maxim's precision voltage reference product line, engineered specifically for applications demanding tight initial accuracy, low drift, and multifunction capability - including simultaneous reference generation and temperature sensing in compact systems.

FAQ

What is the operating temperature range for the MAX675ESA+T?

The MAX675ESA+T is rated for operation from −40°C to +85°C, as confirmed in Maxim's official ordering information table. This extended industrial temperature grade distinguishes it from the commercial-grade MAX675CSA (0°C to +70°C) and ensures reliable performance in harsh environments such as factory automation controllers and outdoor instrumentation. The device maintains its 15ppm/°C tempco and ±7mV output tolerance across this full range.

Does the MAX675ESA+T require external components to function as a voltage reference?

No, the MAX675ESA+T operates as a complete +5V reference with no external components required for basic functionality. It only needs decoupling capacitors (recommended 0.1µF ceramic at VIN and VOUT) for noise suppression. The TRIM and TEMP pins are optional: TRIM can be left open for nominal 5V output, and TEMP may be unused if temperature sensing is not needed - both configurations preserve full reference specifications.

Can the MAX675ESA+T drive a 10mA load directly?

No, the MAX675ESA+T is not designed to source or sink 10mA continuously. Its maximum guaranteed load current is 10mA only at elevated temperatures and reduced input voltage (per Figure MAX675 toc04), but typical safe operating load is ≤1mA. For higher loads, a buffer amplifier (e.g., rail-to-rail op-amp) must be used. The datasheet specifies 0.001%/mA load regulation up to 10mA, but quiescent current increases significantly above 1mA, risking thermal drift.

How does the TEMP pin on the MAX675ESA+T work, and what is its accuracy?

The TEMP pin on the MAX675ESA+T outputs a voltage linearly proportional to absolute temperature: V_TEMP = 2.1 mV/°C × (T + 273), yielding 630mV at 25°C. Accuracy is ±5mV (≈ ±2.4°C) over −40°C to +85°C, as verified in Typical Operating Characteristics (Figure 2). It requires no calibration or external components, and draws negligible current (<50nA), making it ideal for low-power remote sensing when digitized by a high-impedance ADC input.

Is the MAX675ESA+T pin-compatible with the REF02 series?

Yes, the MAX675ESA+T is explicitly stated in its datasheet as "pin-for-pin compatible with REF02", sharing identical SO-8 pin assignments for VOUT, TRIM, GND, VIN, and TEMP (mapped to REF02's unused pins). However, REF02 lacks the TEMP pin function and offers only ±0.3% initial accuracy and 25ppm/°C tempco. Thus, while PCB layout is interchangeable, full feature utilization requires verifying schematic connections to unused REF02 pins.