Analog Devices Inc. REF02Z

Overview

REF02Z from Analog Devices is a precision 5.0 V voltage reference IC with ±0.5% initial accuracy, 8.5 ppm/°C max temperature coefficient (−55°C to +125°C), and 15 µV_p-p low-frequency noise (0.1–10 Hz), designed for high-resolution ADC/DAC biasing and industrial process control signal conditioning.

For engineers reviewing the REF02Z datasheet, REF02Z pinout, REF02Z application, or REF02Z equivalent, this page delivers verified electrical specs, thermal sensing capability via the TEMP pin, trim-adjustable output, and real-world design context for stable, low-drift analog subsystems.

Technical Context

The REF02Z implements a laser-trimmed bandgap core with PTAT current generation and buffered output stage, delivering stable 5.0 V output across input voltages from 7.0 V to 36 V. Its TEMP pin provides unbuffered bandgap voltage (580 mV at 25°C) with 1.96 mV/°C linear sensitivity for on-chip temperature monitoring.

It features internal op-amp feedback with R5/R6 network for precise output setting, TRIM terminal for ±3.0% to ±6.0% output adjustment using external potentiometer, and robust load regulation (≤100 ppm/mA) up to 10 mA sourcing current - all in an 8-lead CERDIP package with θ_JA = 162°C/W.

Key Specifications

Pinout & Package

REF02Z is packaged in an 8-lead CERDIP (Z-suffix) with hermetic ceramic-glass seal, rated for −65°C to +150°C storage and −55°C to +125°C operating temperature. Thermal resistance θ_JA = 162°C/W ensures reliable operation under sustained load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02Z, ADR02ARZ offers superior accuracy and stability for high-end instrumentation but requires updated layout for thermal management; LM4040C50IDBZR reduces footprint and cost but sacrifices temperature monitoring, trim capability, and wide-temp operation.

Availability

REF02Z is available at Aetrix Electronics and suitable for industrial process control, precision data acquisition, military avionics, and calibration equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF02Z 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 REF01/REF02/REF03 series was engineered for applications demanding ultra-stable DC references in harsh environments - emphasizing low drift, hermetic packaging, and integrated diagnostics like temperature sensing.

FAQ

What is the operating temperature range for REF02Z?

The REF02Z is specified for operation from −55°C to +125°C, with guaranteed 8.5 ppm/°C maximum temperature coefficient across that full range. This makes REF02Z suitable for military, aerospace, and downhole industrial applications where extreme ambient conditions are expected. The device's CERDIP package contributes to its robust thermal performance and long-term reliability under thermal cycling stress.

Does REF02Z support output voltage adjustment, and how is it implemented?

Yes, REF02Z supports output voltage adjustment via its dedicated TRIM pin. Using an external 10 kΩ potentiometer connected between VOUT and GND, with the wiper to TRIM, the output can be tuned ±3.0% to ±6.0% depending on grade. This allows system-level compensation for errors introduced by PCB layout, solder reflow, or sensor interface gain mismatches - all without modifying the core reference architecture of REF02Z.

Can the TEMP pin on REF02Z be used for accurate temperature measurement?

Yes, the TEMP pin on REF02Z provides a linear, unbuffered bandgap voltage output of 580 mV at 25°C with a well-characterized sensitivity of 1.96 mV/°C. While not a calibrated sensor IC, REF02Z's TEMP pin enables relative temperature tracking or coarse absolute measurement (±2°C typical) when paired with a precision ADC - eliminating the need for discrete temperature sensors in many REF02Z-based systems.

What are the recommended decoupling capacitors for REF02Z?

Analog Devices recommends a 0.1 µF ceramic capacitor directly at the VOUT pin to suppress low-frequency noise and improve stability. For improved transient response under dynamic load changes, a parallel 1–10 µF tantalum or ceramic capacitor is advised. On the VIN pin, a 1–10 µF bulk capacitor plus a 0.1 µF ceramic capacitor minimizes supply ripple - all placed as close as possible to their respective pins to maintain REF02Z's specified noise and regulation performance.

Is REF02Z pin-compatible with newer Analog Devices references like ADR02?

No, REF02Z is not pin-compatible with ADR02. Although both provide 5.0 V reference outputs and share functional similarities, ADR02 uses a different pinout (e.g., NC pins relocated, no dedicated TEMP pin) and operates with distinct quiescent current and startup behavior. Migration from REF02Z to ADR02 requires PCB layout revision and validation of thermal and transient performance - REF02Z remains the correct choice for legacy designs and applications requiring the TEMP and TRIM functions.