Analog Devices Inc. REF02EH

Overview

REF02EH from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with integrated temperature-sensing output, housed in an 8-lead TO-5 metal can package. It delivers ±0.3% initial accuracy, 5ppm/°C typical temperature coefficient over 0°C to 70°C, 10μV_P-P (0.1Hz–10Hz) output noise, and supports up to 10mA load current - enabling high-stability bridge excitation in strain gauge instrumentation.

For engineers reviewing the REF02EH datasheet, REF02EH pinout, REF02EH application, or REF02EH equivalent, key selection criteria include its guaranteed 0°C to 70°C operating range, dedicated TEMP pin for absolute-temperature monitoring, low 1.4mA max quiescent current, and compatibility with trimming networks for system-level calibration.

Technical Context

The REF02EH implements a thermally compensated bandgap core with internal curvature correction, delivering stable 5.000V nominal output across input voltages from 7V to 40V. Its TEMP pin provides a linear 2.1mV/°C output referenced to GND, calibrated at 620mV at 25°C - enabling dual-function operation as both reference and temperature sensor without external components.

Designed for low-drift analog signal chains, it features 0.0001%/V line regulation and 0.001%/mA load regulation (0–10mA), with short-circuit protection to ground or VIN ≤16V. The H-package metal can ensures hermeticity and superior thermal stability versus plastic or ceramic alternatives.

Key Specifications

Pinout & Package

REF02EH uses the H-package: 8-lead TO-5 metal can (0.230" pin circle diameter), hermetically sealed, with θ_JA = 150°C/W and T_JMAX = 150°C. Pins 1, 2, and 4 are internally connected NC terminals; Pin 7 (GND) is case-connected for shielding and thermal conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02EH, LT1019CS8 offers tighter initial accuracy but removes the TEMP functionality essential for self-compensating systems, while REF02EN8 trades hermetic reliability for manufacturability - making REF02EH optimal for mission-critical industrial sensing where drift and environmental resilience are prioritized.

Availability

REF02EH is available at Aetrix Electronics and suitable for precision instrumentation, industrial data acquisition, and embedded sensor conditioning requiring stable component supply, long-term calibration retention, and hermetic reliability.

Supply support for REF02EH 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The REF-01/REF-02 family was designed specifically for precision analog signal chains requiring stable, low-drift, dual-function references - especially in bridge-based sensing, high-resolution data conversion, and temperature-aware instrumentation.

FAQ

What is the guaranteed operating temperature range for REF02EH?

The REF02EH is specified for 0°C to 70°C operation, as confirmed by its order code suffix "EH" and the Absolute Maximum Ratings table. This range is fully boxed - meaning all electrical parameters, including tempco and output voltage, are guaranteed across this interval without derating. The metal can package ensures consistent thermal behavior within this envelope, unlike plastic variants that may exhibit higher long-term drift.

Can the TEMP pin of REF02EH be used as a standalone temperature sensor?

Yes - the TEMP pin on REF02EH outputs a linear voltage proportional to absolute temperature (2.1mV/°C), calibrated to 620mV at 25°C. It requires no external components and supports direct connection to an ADC input, provided current into/out of the pin stays within ±50nA and capacitive loading remains ≤30pF. This makes REF02EH uniquely suited for dual-purpose designs where one device serves both reference and sensing roles.

Is REF02EH pin-compatible with other REF-02 variants like REF02EN8#PBF?

Yes - REF02EH shares identical pin numbering, function mapping, and electrical interface with REF02EN8#PBF and REF02EJ8#PBF. All three use the same 8-pin configuration (INPUT, OUTPUT, TEMP, TRIM, GND, and NCs), enabling drop-in substitution across H (TO-5), N8 (PDIP), and J8 (CERDIP) packages. However, thermal performance and long-term stability differ due to package construction, not pinout.

What is the maximum allowable input voltage for REF02EH?

The absolute maximum input voltage for REF02EH is 40V, as stated in the Absolute Maximum Ratings table. Operation above 40V risks permanent damage. For reliable long-term performance, input should be maintained between 7V and 33V - the range over which line regulation is characterized (0.0001%/V typical). Inputs >16V require current limiting to prevent unsafe short-circuit conditions.

How does the TRIM pin on REF02EH enable output adjustment?

The TRIM pin on REF02EH connects to an internal resistive divider node, allowing external adjustment of the output voltage using a 10kΩ potentiometer between OUTPUT and GND, with the wiper tied to TRIM. This provides ±3% output tuning range (4.85V–5.15V), enabling system-level calibration to compensate for downstream gain errors or tolerances in associated circuitry - all without modifying the REF02EH's internal bandgap core.