Analog Devices Inc. AD648JRZ-REEL

Overview

AD648JRZ-REEL from Analog Devices is a dual precision, low-power BiFET operational amplifier in an 8-lead SOIC package, featuring 400 µA max quiescent current per amplifier, 10 pA max input bias current (warmed up), and 2 mV max input offset voltage (J grade). It delivers 1 MHz unity-gain bandwidth and 1.8 V/µs slew rate, making it suitable for battery-powered instrumentation front ends and CMOS DAC buffers.

For engineers reviewing the AD648JRZ-REEL datasheet, AD648JRZ-REEL pinout, AD648JRZ-REEL application, or AD648JRZ-REEL equivalent, key selection criteria include guaranteed low input bias current over full common-mode range, laser-trimmed offset drift (20 µV/°C max), crosstalk < –120 dB at 1 kHz, and compatibility with ±4.5 V to ±18 V dual supplies.

Technical Context

The AD648JRZ-REEL integrates two matched JFET-input op amps on a single die using ion-implanted FET and laser wafer trimming. Its input stage maintains sub-10 pA bias current across the full common-mode voltage range (±11 V), enabling high-impedance sensor interfacing without degradation.

It achieves 82 dB min common-mode rejection (B grade) and >1000 V/mV open-loop gain (RL ≥ 10 kΩ), supporting 12-bit linearity in buffer configurations. The device exhibits 2 µV p-p 0.1 Hz–10 Hz input voltage noise and 1.8 fA/√Hz input current noise at 1 kHz - critical for photodiode preamplifiers and log-ratio circuits.

Key Specifications

Pinout & Package

AD648JRZ-REEL is housed in an 8-lead SOIC (R-8) package compliant with JEDEC MS-012 AA, with body dimensions 5.00 mm × 4.00 mm × 1.50 mm and 1.27 mm lead pitch. Tape-and-reel packaging follows EIA-481A standard (REEL designation).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual precision op amp applications.

Compared with TL062CDR, AD648JRZ-REEL provides 3× lower guaranteed bias current and 2.5× better drift control, enabling stable operation across 0°C–70°C without recalibration; versus OPA2134PA, it trades 80% lower supply current for reduced bandwidth and higher noise - optimal for precision DC/low-frequency systems where energy efficiency is paramount.

Availability

AD648JRZ-REEL is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision DAC buffering, photodiode signal conditioning, and low-power instrumentation amplifier designs requiring stable component supply across extended product lifecycles.

Supply support for AD648JRZ-REEL 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The AD648 product line was engineered for dual-supply, low-power precision signal conditioning - targeting applications where ultra-low input bias current, laser-trimmed dc accuracy, and thermal stability outweigh raw speed or rail-to-rail output swing.

FAQ

What is the maximum operating temperature range for AD648JRZ-REEL?

The AD648JRZ-REEL is rated for the commercial temperature range of 0°C to +70°C. This grade (J) is specified under these conditions, with parameters including 2 mV max input offset voltage and 20 µV/°C max drift guaranteed across the full range. Operation outside this range may violate specifications and is not supported by Analog Devices' characterization data for this variant.

Does AD648JRZ-REEL support single-supply operation?

Yes, AD648JRZ-REEL operates with supply voltages from ±4.5 V to ±18 V, allowing use in single-supply configurations (e.g., +9 V and ground) by biasing inputs within the common-mode range (–11 V to +12 V relative to V–). However, output swing is asymmetric: it can swing to within ~1 V of V+ and ~3 V of V–, so proper level-shifting networks are required for true rail-to-rail output.

Is AD648JRZ-REEL pin-compatible with other dual op amps?

Yes, AD648JRZ-REEL uses the industry-standard 8-pin SOIC dual op amp pinout and is explicitly documented as pin-compatible with LF442, TL062, and AD642. This allows direct replacement in existing layouts to reduce power consumption by up to 85% without PCB modifications, provided supply voltage and output loading remain within AD648JRZ-REEL's specified limits.

What is the input protection capability of AD648JRZ-REEL?

AD648JRZ-REEL is guaranteed to withstand input voltages equal to its supply rails (±18 V absolute max). Exceeding the negative supply on either input forward-biases internal junctions and may cause permanent damage. For fault conditions involving >100 V transients, external protection - such as 100 kΩ series resistors limiting current to <1 mA - is required, as detailed in Analog Devices' Application Note for Figures 23a–c.

How does AD648JRZ-REEL perform in photodiode preamplifier circuits?

AD648JRZ-REEL excels in photodiode preamps due to its 10 pA max input bias current, 2 µV p-p 0.1 Hz–10 Hz noise, and < –120 dB crosstalk. In dual-photodiode configurations, these specs enable sub-0.1% common-mode rejection and stable 700 kHz bandwidth - critical for rejecting ambient light interference while preserving weak photocurrent signals down to 300 pA, as validated in Figure 28 of the AD648 datasheet.