Analog Devices Inc. ADR02AR

Overview

ADR02AR from Analog Devices is a precision 5.0 V band gap voltage reference IC with ±0.1% initial accuracy, 3 ppm/°C typical temperature coefficient (A-grade, SOIC), and 10 µV_p-p low-frequency noise (0.1 Hz to 10 Hz). It operates from 7.0 V to 36.0 V input, delivers up to 10 mA output current, and supports industrial temperature range (−40°C to +125°C). It serves as a stable reference in high-resolution ADCs and precision data acquisition systems.

For engineers reviewing the ADR02AR datasheet, ADR02AR pinout, ADR02AR application, or ADR02AR equivalent, key selection considerations include its 5-lead SC70/TSOT or 8-lead SOIC package options, TRIM and TEMP pins for output adjustment and temperature monitoring, dropout voltage of 2 V, and compatibility with REF02-based designs where pin-to-pin replacement is required in SOIC format.

Technical Context

The ADR02AR implements a band gap reference core with internal trimming and buffered output, enabling high stability without external capacitors. Its TEMP pin provides a calibrated 550 mV baseline with 1.96 mV/°C sensitivity for system-level temperature compensation.

It features active line and load regulation circuitry, achieving ≤30 ppm/V line regulation and ≤70 ppm/mA load regulation over −40°C to +125°C. The device maintains low quiescent current (0.65–1.0 mA) across its full operating voltage and temperature range.

Key Specifications

Pinout & Package

ADR02AR is available in 5-lead SC70 (KS-5) and 8-lead SOIC (R-8) packages. The SOIC variant is pin-compatible with REF02. Pin functions are identical across ADR01/ADR02/ADR03/ADR06 families.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02CSZ, ADR02AR offers tighter tempco and integrated temperature sensing; compared with ADR02ARMZ, it uses SC70 packaging with higher thermal resistance but identical electrical behavior - choice depends on PCB space, thermal management, and assembly process constraints.

Availability

ADR02AR is available at Aetrix Electronics and suitable for precision data acquisition systems, industrial process controllers, and automotive battery monitoring applications requiring stable component supply, long-term calibration integrity, and extended temperature operation.

Supply support for ADR02AR 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADR02AR belongs to the ADR0x precision voltage reference family, designed specifically for applications demanding ultra-low drift, low noise, and compact packaging in industrial, instrumentation, and automotive environments.

FAQ

What is the maximum input voltage rating for the ADR02AR?

The ADR02AR has an absolute maximum supply voltage rating of 36.0 V. Operation above this voltage risks permanent damage. For reliable long-term performance, the recommended operating range is 7.0 V to 36.0 V, with dropout voltage fixed at 2 V - meaning ≥7 V input is required to maintain regulated 5.0 V output under all load and temperature conditions. This makes ADR02AR suitable for direct connection to 12 V or 24 V industrial bus rails.

Does the ADR02AR require external capacitors for stability?

No, the ADR02AR is internally compensated and does not require external input or output capacitors for stability. This eliminates capacitor-related aging, leakage, and board space concerns. However, if used in noisy environments, a 0.1 µF ceramic capacitor at VIN is recommended for improved ripple rejection - the device maintains regulation and noise performance even without it, as confirmed in the datasheet's "No external capacitor required" feature and transient response figures.

How is the TEMP pin on the ADR02AR used in practice?

The TEMP pin on the ADR02AR outputs a calibrated 550 mV at 25°C with a linear sensitivity of 1.96 mV/°C. It is used to monitor die temperature for system-level compensation - for example, correcting ADC offset drift or adjusting sensor gain. Unlike discrete sensors, it requires no calibration; its output can be digitized directly by a microcontroller ADC. The pin is not intended to drive loads - keep sink/source current below 10 µA to avoid affecting reference accuracy.

Is the ADR02AR pin-compatible with the REF02 in all packages?

The ADR02AR in 8-lead SOIC (R-8) package is pin-to-pin compatible with REF02, including identical VIN, VOUT, GND, TRIM, and NC pin assignments. However, the ADR02AR adds functional TEMP pin capability not present in REF02 - when replacing REF02, the TEMP pin must be left unconnected or tied to a high-impedance ADC input. SC70 and TSOT variants of ADR02AR have no REF02 equivalents and use different pinouts.

What grade options are available for the ADR02AR, and how do they differ?

The ADR02AR is offered in A, B, and C grades. A-grade provides 3 ppm/°C typical tempco (SOIC) and ±0.1% initial accuracy; B-grade tightens initial accuracy to ±0.06% but retains same tempco spec; C-grade relaxes tempco to 10–40 ppm/°C for cost-sensitive applications. All grades operate from −40°C to +125°C, but only A-grade SOIC variants are AEC-Q100 qualified for automotive use. The "AR" suffix denotes SOIC package with A-grade specification.