Analog Devices Inc. ADR03BR

Overview

ADR03BR from Analog Devices is a precision 2.5 V band gap voltage reference IC designed for high-accuracy analog signal chains. It delivers ±0.2% initial accuracy, 3 ppm/°C typical temperature coefficient (8-lead SOIC, A grade), 5 µV_p-p low-frequency noise (0.1 Hz to 10 Hz), operates from 4.5 V to 36 V supply, and supports 10 mA output current across −40°C to +125°C. It is used in high-resolution ADC/DAC biasing and industrial process control sensor excitation.

For engineers reviewing the ADR03BR datasheet, ADR03BR pinout, ADR03BR application, or ADR03BR equivalent, key selection considerations include its 2.5 V output stability under wide input voltage variation, integrated TEMP pin for on-chip temperature monitoring, TRIM capability for fine output adjustment, and compatibility with space-constrained PCB layouts via SC70/TSOT/SOIC packaging options.

Technical Context

The ADR03BR implements a curvature-compensated band gap core with internal trimming to achieve tight initial accuracy and low thermal drift. Its five-terminal architecture includes dedicated VIN, VOUT, GND, TRIM, and TEMP pins-enabling both precision voltage regulation and auxiliary temperature sensing without external components.

It features no external capacitor requirement, 4 µs turn-on settling time, −75 dB ripple rejection at 10 kHz, and maintains load regulation of ≤70 ppm/mA (0–10 mA) over full temperature range. The device's dropout voltage remains stable at 2 V across operating conditions, supporting robust operation even near minimum supply limits.

Key Specifications

Pinout & Package

ADR03BR is available in 8-lead SOIC (R-8) package per ordering code BR suffix, with standard surface-mount footprint and 1.27 mm lead pitch. Thermal resistance θ_JA = 130°C/W enables reliable operation without heatsinking in typical PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF03CSZ, ADR03BR adds temperature sensing and lower typical drift without layout changes; compared with ADR03ARZ, it trades minor accuracy/tempco margin for cost optimization while retaining full functional compatibility.

Availability

ADR03BR is available at Aetrix Electronics and suitable for industrial process control, precision data acquisition, and automotive battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADR03BR 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 ADR03BR belongs to the ADR0x family of ultracompact precision voltage references, engineered for space-constrained, high-accuracy applications including test equipment, industrial sensors, and automotive subsystems.

FAQ

What is the output voltage tolerance of the ADR03BR over temperature?

The ADR03BR guarantees ±0.2% initial accuracy (±5 mV) at 25°C and maintains output stability with a typical temperature coefficient of 3 ppm/°C in the 8-lead SOIC A-grade package. Over the full −40°C to +125°C range, this results in a maximum drift of ±0.375 mV relative to nominal 2.500 V, confirmed in Table 4 of the Rev. S datasheet.

Does the ADR03BR require an external output capacitor for stability?

No, the ADR03BR is internally compensated and does not require an external output capacitor for stability across all load conditions up to 10 mA. This is explicitly stated in the FEATURES section and verified in the Applications Information section of the datasheet, simplifying design and reducing bill-of-materials count.

Can the TEMP pin of the ADR03BR be used for accurate temperature measurement?

Yes-the TEMP pin provides a factory-calibrated analog voltage output of 550 mV ±10 mV at 25°C with a linear sensitivity of 1.96 mV/°C across −40°C to +125°C. This enables direct MCU ADC reading for system temperature monitoring without additional sensors, as detailed in the GENERAL DESCRIPTION and Electrical Characteristics tables.

Is the ADR03BR pin-compatible with the REF03 voltage reference?

The 8-lead SOIC version of the ADR03BR is pin-to-pin compatible with the REF03, sharing identical VIN, VOUT, GND, TRIM, and NC pin assignments. The ADR03BR adds functional equivalence while integrating the TEMP pin on Pin 4-making it a drop-in replacement with enhanced capability, per Note 1 in Table 1 and Figure 2.

What is the maximum supply voltage and dropout behavior of the ADR03BR?

The ADR03BR operates with a supply voltage range of 4.5 V to 36.0 V and exhibits a fixed dropout voltage of 2 V, meaning V_OUT remains regulated as long as V_IN ≥ 4.5 V. This is specified in the GENERAL DESCRIPTION and confirmed in Figure 21 (Dropout Voltage vs. Load Current), ensuring reliable operation across automotive and industrial supply rails.