Analog Devices Inc. REF02HJ8

Overview

REF02HJ8 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with integrated temperature-sensing output, housed in an 8-lead CERDIP (J8) hermetic package. It delivers ±0.3% initial accuracy, 8ppm/°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 and precision DAC/ADC biasing in industrial sensor signal chains.

For engineers reviewing the REF02HJ8 datasheet, REF02HJ8 pinout, REF02HJ8 application, or REF02HJ8 equivalent, key selection criteria include its guaranteed 0°C to 70°C operating range, dedicated temperature output pin (620mV at 25°C, +2.1mV/°C), low 1.4mA max quiescent current, and trimmable output via external resistor network - critical for calibration-critical instrumentation and metrology-grade analog front-ends.

Technical Context

The REF02HJ8 implements a two-terminal bandgap core with buffered output and separate temperature-sensing circuitry referenced to the same internal bandgap. Its output voltage is trimmed at wafer level and further adjustable via external resistors connected to the TRIM pin, while the TEMP pin provides a ratiometric, linear voltage proportional to absolute temperature - independent of supply variations.

Designed for low-drift operation in thermally stable environments, it features internal thermal shutdown and short-circuit protection, with line regulation of 0.0001%/V and load regulation of 0.0005%/mA (0–10mA). The J8 package ensures hermeticity and long-term stability, distinguishing it from plastic DIP (N8) and metal can (H) variants.

Key Specifications

Pinout & Package

REF02HJ8 uses an 8-lead CERDIP (J8) hermetic ceramic dual-in-line package (0.300" width), rated for 0°C to 70°C operation. The package provides moisture resistance, low leakage, and long-term parametric stability essential for metrology applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02HJ8, REF02EHJ8#PBF trades typical drift performance for assured worst-case spec compliance, while LT1019CS8#PBF delivers superior voltage accuracy at the expense of losing the integrated temperature output - making REF02HJ8 uniquely suited for space-constrained dual-function (voltage + temp) calibration nodes.

Availability

REF02HJ8 is available at Aetrix Electronics and suitable for precision instrumentation, automated test equipment, and industrial calibration systems requiring stable component supply with hermetic reliability and traceable lot history.

Supply support for REF02HJ8 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 and maintains its precision analog portfolio, including voltage references, op-amps, and data converters - known for metrology-grade specifications and long-term reliability.

The REF-02 family was designed specifically for applications demanding simultaneous precision voltage referencing and calibrated temperature monitoring in compact, hermetically sealed packages - targeting test & measurement, aerospace subsystems, and medical diagnostics.

FAQ

What is the operating temperature range for REF02HJ8?

The REF02HJ8 is specified for 0°C to 70°C operation, as confirmed by its J8 package marking and ordering code REF02HJ8#PBF in the Linear Technology (now Analog Devices) REF-01/REF-02 datasheet. This range is distinct from the –55°C to 125°C variants (e.g., REF02AH), and thermal performance parameters like tempco and drift are guaranteed only within this 0°C–70°C box.

Does REF02HJ8 provide a temperature output, and how is it used?

Yes, REF02HJ8 provides a dedicated temperature output on Pin 3 (TEMP), delivering 620mV at 25°C with a linear coefficient of +2.1mV/°C. This output shares the same bandgap reference as the 5V OUTPUT pin, ensuring ratiometric accuracy. To use it, connect Pin 3 to a high-impedance ADC input (≤50nA load) with ≤30pF capacitance - no external components are required for basic Kelvin measurement.

Can the output voltage of REF02HJ8 be adjusted, and how does trimming affect the temperature output?

Yes, REF02HJ8 output voltage is adjustable via an external resistor network connected to Pin 8 (TRIM), supporting ±3% range. Critically, trimming affects both the 5V OUTPUT and TEMP pins proportionally - meaning the temperature coefficient (+2.1mV/°C) and offset (620mV at 25°C) scale identically with output adjustment. This preserves calibrated temperature measurement accuracy after output calibration.

What is the maximum load current REF02HJ8 can drive, and what happens beyond that limit?

REF02HJ8 can source up to +10mA and sink up to –0.3mA while maintaining specified accuracy and regulation. Exceeding these limits degrades line/load regulation and may cause output droop or thermal instability. The device includes short-circuit protection to ground and to VIN ≤ 16V indefinitely, but shorting to VIN > 16V is not allowed per Absolute Maximum Ratings.

Is REF02HJ8 pin-compatible with other REF-02 variants, and what package type does it use?

Yes, REF02HJ8 uses the 8-lead CERDIP (J8) package and shares identical pinout with all other J8-marked REF-02 variants (e.g., REF02EJ8#PBF, REF02CJ8#PBF). Pin functions - INPUT (2), TEMP (3), GND (4), OUTPUT (7), TRIM (8) - are consistent across J8 versions; only temperature range, tempco, and initial accuracy differ per grade. No PCB layout change is needed when substituting within the J8 family.