Analog Devices Inc. REF02AJ8

Overview

REF02AJ8 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with integrated temperature-sensing output, designed for high-stability analog signal chains in industrial and test equipment. It delivers ±0.3% initial accuracy, 5ppm/°C typical temperature coefficient over –55°C to +125°C, 10μV_P-P (0.1Hz–10Hz) output noise, and operates from 7V to 40V input. It is used in bridge excitation, precision DAC/ADC biasing, and calibrated sensor front-ends.

For engineers reviewing the REF02AJ8 datasheet, REF02AJ8 pinout, REF02AJ8 application, or REF02AJ8 equivalent, key selection criteria include its guaranteed full-temperature-range TC (8.5ppm/°C max), dedicated TEMP pin for absolute-temperature monitoring, low 1.4mA quiescent current, and hermetic CERDIP packaging for harsh-environment reliability.

Technical Context

The REF02AJ8 implements a trimmed bandgap core with internal curvature compensation to achieve low drift across –55°C to +125°C. Its TEMP pin provides a linear 2.1mV/°C output referenced to GND, calibrated at 620mV at 25°C - a feature exclusive to REF-02 variants and disabled on REF-01.

It supports adjustable output via external trim resistors (±3% range), maintains load regulation of 0.001%/mA (0–10mA), and achieves line regulation of 0.0001%/V across (V_OUT + 3V) ≤ V_IN ≤ 33V. The device is specified for indefinite short-circuit-to-ground survival and features 25mA short-circuit current limiting.

Key Specifications

Pinout & Package

REF02AJ8 is housed in an 8-lead hermetic CERDIP (J8) package with 0.300-inch narrow body, rated for –55°C to +125°C operation and qualified for high-reliability applications including aerospace and downhole instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02AJ8, LT1019CN8#PBF offers superior initial accuracy but lacks integrated temperature sensing, while REF02EH#PBF matches functionality at reduced temperature range and package robustness - making REF02AJ8 the sole option for full-spec, hermetically sealed, dual-output operation in extended-temperature industrial systems.

Availability

REF02AJ8 is available at Aetrix Electronics and suitable for precision instrumentation, downhole sensor modules, and military-grade data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF02AJ8 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

Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, emphasizing high-performance signal conditioning, power management, and data conversion solutions for demanding industrial, aerospace, and medical applications.

The REF-01/REF-02 family was engineered as cost-optimized, dual-function voltage references with integrated temperature sensing - targeting applications needing both stable excitation and on-die thermal monitoring without external components.

FAQ

What is the guaranteed temperature coefficient specification for REF02AJ8 over its full operating range?

The REF02AJ8 is specified with a maximum temperature coefficient of 8.5ppm/°C over the full –55°C to +125°C operating range, verified per the REF-02A grade. This value appears in the Electrical Characteristics table under "TC" with footnote "l" indicating full-temperature-range applicability, and is distinct from the 5ppm/°C typical value measured at 25°C.

Can the TEMP pin of REF02AJ8 be used to measure temperature accurately, and what are its interface requirements?

Yes, the TEMP pin of REF02AJ8 provides a calibrated linear output of 620mV at 25°C with a slope of 2.1mV/°C, enabling direct Kelvin-scale temperature measurement. To maintain accuracy, the pin must be loaded with ≤50nA and capacitance ≤30pF - typically achieved using a unity-gain buffer op-amp with pA-level input bias current and minimal PCB trace capacitance.

Is REF02AJ8 pin-compatible with other members of the REF-01/REF-02 family, and which pins differ?

REF02AJ8 shares identical pinout with all REF-01/REF-02 variants in the J8 package, including REF01AJ8 and REF02EJ8. Pin 3 (TEMP) is functional only on REF-02 devices and must remain unconnected on REF-01; all NC pins (1, 5, 6) are internally disconnected and must float. No pin mapping differences exist within the J8 footprint.

What is the maximum allowable input voltage for REF02AJ8, and does it vary with temperature?

The absolute maximum input voltage for REF02AJ8 is 40V, as stated in the Absolute Maximum Ratings table for REF-01/REF-02 A/E/H grades. This limit is temperature-independent and applies across the full –55°C to +125°C operating range; exceeding 40V risks permanent damage regardless of ambient conditions or duration.

How does the output adjustment capability of REF02AJ8 affect its temperature coefficient?

Adjusting the REF02AJ8 output via the TRIM pin (Pin 8) changes the nominal voltage by ±3%, but introduces only 0.5ppm/% increase in temperature coefficient - meaning a full ±3% trim adds at most ±1.5ppm/°C to the base TC. This low sensitivity preserves stability even when factory or field calibration is performed.