Analog Devices Inc. REF01EZ

Overview

REF01EZ from Analog Devices is a precision 10.0 V voltage reference IC with ±0.3% initial accuracy (A/E grade), 8.5 ppm/°C max temperature coefficient, 30 µV_p-p low-frequency noise (0.1–10 Hz), 1.4 mA max quiescent current, and 10 mA load-driving capability - used as a stable excitation source in high-resolution ADCs and DACs within industrial process controllers.

For engineers reviewing the REF01EZ datasheet, REF01EZ pinout, REF01EZ application, or REF01EZ equivalent, this page delivers verified electrical specs, package-specific terminal mapping, real-world use cases, and two validated alternative parts - all grounded in Analog Devices' Rev. M datasheet and official ordering information for the EZ-grade TO-99 variant.

Technical Context

The REF01EZ implements a laser-trimmed band gap core with PTAT and CTAT voltage generation, delivering a fixed 10.0 V output via internal op-amp feedback across R5/R6. Its TEMP pin provides unbuffered band gap voltage (580 mV at 25°C) with 1.96 mV/°C linearity for on-chip temperature monitoring.

It features a TRIM terminal enabling ±3% output adjustment using an external 10 kΩ potentiometer, and supports input voltages from 12 V to 36 V with 2 V dropout. The device operates over −55°C to +125°C (A/E grades) and maintains stability without external capacitors - though 0.1 µF ceramic output capacitance is recommended for noise reduction.

Key Specifications

Pinout & Package

REF01EZ is supplied in an 8-lead TO-99 metal can package (J-suffix), with case ground connected internally to Pin 2 (GROUND). The package provides hermetic sealing and superior thermal performance (θ_JA = 170°C/W, θ_JC = 24°C/W), suitable for military/aerospace and high-reliability industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF01EZ, ADR01ARZ offers tighter initial accuracy and lower tempco but lacks the TEMP and TRIM terminals essential for embedded thermal compensation and field recalibration; REF5010AID adds output buffering and higher precision but sacrifices the diagnostic and adjustability features that define REF01EZ's role in serviceable, long-lifecycle instrumentation.

Availability

REF01EZ is available at Aetrix Electronics and suitable for industrial process control systems, precision data acquisition modules, military avionics interfaces, and field-service calibration tools requiring stable component supply with long-term lifecycle support.

Supply support for REF01EZ 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 REF01EZ belongs to the REF01/REF02/REF03 family - designed specifically for applications demanding high DC accuracy, low drift, and integrated diagnostics (TEMP/TRIM) in space-constrained, high-reliability environments.

FAQ

What is the operating temperature range for the REF01EZ?

The REF01EZ (EZ grade) operates over −55°C to +125°C, matching the A/E grade specification in the REF01/REF02/REF03 datasheet Rev. M. This extended range is enabled by the hermetic TO-99 package and internal design optimizations - making REF01EZ suitable for under-hood automotive, downhole oil/gas, and aerospace applications where ambient extremes are expected. All key parameters including tempco and initial accuracy are guaranteed across this full range.

Does the REF01EZ require external capacitors to operate stably?

The REF01EZ is internally compensated and functions stably without external capacitors. However, Analog Devices recommends a 0.1 µF ceramic capacitor from VOUT to GND to reduce low-frequency noise and improve transient response. An additional 1–10 µF bulk capacitor may be added in parallel for improved load-step immunity - though this increases turn-on settling time. Input capacitance (1–10 µF + 0.1 µF ceramic) is advised if the supply exhibits ripple or step transients.

How is the TEMP pin used in the REF01EZ?

The TEMP pin on the REF01EZ outputs an unbuffered band gap voltage of 580 mV at 25°C with a linear temperature coefficient of 1.96 mV/°C. It is used for on-chip temperature monitoring - for example, to compensate sensor offset drift or detect overheating. No external biasing is required; the pin sinks negligible current (<100 nA), allowing direct connection to a high-impedance ADC input. The voltage vs. temperature relationship is monotonic and factory-characterized.

Can the output voltage of the REF01EZ be adjusted, and how?

Yes - the REF01EZ includes a dedicated TRIM terminal (Pin 5) enabling ±3% output adjustment using an external 10 kΩ potentiometer configured per Figure 35 in the datasheet. This allows fine-tuning of the 10.0 V output to correct for system-level errors such as PCB trace resistance, solder reflow shift, or long-term drift. Adjustment does not degrade temperature performance, provided low-tempco resistors are used in the external network.

What is the maximum load current the REF01EZ can drive?

The REF01EZ can source up to 10 mA continuously while maintaining specified accuracy and regulation - sufficient to drive most precision ADC reference inputs, op-amp buffers, or series resistor networks directly. It can also sink up to −0.3 mA. Exceeding 10 mA risks increased self-heating, which degrades tempco and long-term stability; for higher loads, an external unity-gain buffer (e.g., AD8676) is recommended to preserve REF01EZ's precision performance.