Analog Devices Inc. OP497FSZ

Overview

OP497FSZ from Analog Devices is a precision quad operational amplifier in a 16-lead SOIC_W (RW-16) package, featuring 75 μV max offset voltage, 150 pA max input bias current at 25°C, and 2000 V/mV minimum open-loop gain. It operates from ±2 V to ±20 V supplies and delivers high CMR (114 dB min) and PSRR (114 dB min), making it ideal for strain gage amplifiers, photodiode preamplifiers, and long-term integrators requiring picoampere-level input fidelity.

For engineers reviewing the OP497FSZ datasheet, OP497FSZ pinout, OP497FSZ application, or OP497FSZ equivalent, key selection criteria include guaranteed low bias current across −40°C to +85°C, sub-1 μV/°C drift, rail-to-rail input common-mode range (±13 V at ±15 V supplies), and verified channel separation of 150 dB - all critical for high-impedance sensor signal conditioning and battery-powered instrumentation.

Technical Context

The OP497FSZ employs a superbeta bipolar input stage with bias current cancellation, enabling stable picoampere input bias over temperature - unlike FET-input op amps whose bias doubles per 10°C rise. Its open-loop gain exceeds 2000 V/mV with <0.5 μV/°C typical drift, ensuring high linearity in closed-loop gains ≥1000.

Input common-mode range extends to within 1 V of either supply rail, and output swing reaches ±13.7 V into 2 kΩ at ±15 V supplies. The device exhibits 17 nV/√Hz voltage noise density at 1 kHz and 20 fA/√Hz current noise density at 10 Hz - optimized for low-frequency, high-precision DC-coupled measurement paths.

Key Specifications

Pinout & Package

OP497FSZ is housed in a 16-lead wide-body SOIC (JEDEC MS-013-AA, package option RW-16), 10.65 mm × 7.60 mm × 2.35 mm, RoHS-compliant, with 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OP497GPZ and AD8629ARZ, OP497FSZ uniquely combines picoampere bias stability over temperature, 150 dB channel separation, and 114 dB CMR in a surface-mount SOIC_W package - making it the only option qualified for simultaneous multi-channel DC precision tasks like bridge array conditioning and synchronized long-term integration.

Availability

OP497FSZ is available at Aetrix Electronics and suitable for strain gage amplifiers, photocurrent monitors, and long-term integrators requiring stable component supply with guaranteed RoHS compliance and full traceability.

Supply support for OP497FSZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The OP497 product line was designed specifically for ultra-precision, low-power, multi-channel DC signal conditioning in industrial instrumentation, medical sensors, and scientific measurement equipment - prioritizing bias current stability and long-term drift performance over speed.

FAQ

What is the maximum operating temperature range for the OP497FSZ?

The OP497FSZ is specified for continuous operation from −40°C to +85°C. All key parameters - including input bias current (≤300 pA), offset voltage (≤150 μV), and open-loop gain (≥2000 V/mV) - are guaranteed across this full industrial temperature range, as confirmed in Table 1 of the Rev. E datasheet.

Does the OP497FSZ require external compensation capacitors?

No, the OP497FSZ is unity-gain stable and does not require external compensation. Its internal compensation ensures stable operation with closed-loop gains ≥1, even with 1000 pF capacitive loads - as demonstrated in Figure 31 of the datasheet showing clean small-signal transient response under those conditions.

How does the OP497FSZ achieve low input bias current over temperature?

The OP497FSZ uses a superbeta bipolar input stage with active bias current cancellation circuitry. Unlike standard bipolar or FET-input op amps, this architecture holds input bias current below 300 pA from −40°C to +85°C - avoiding the exponential increase seen in FET devices, which reach nanoamp levels above 85°C.

Can the OP497FSZ be used with single-supply operation?

Yes, the OP497FSZ supports single-supply operation down to +4 V total (±2 V). When operated from +5 V and ground, its input common-mode range extends from −0.5 V to +4.5 V, and output swings from +0.5 V to +4.5 V into 10 kΩ - enabling direct interfacing with microcontroller ADCs without level-shifting circuitry.

What is the purpose of the NC pins on the OP497FSZ SOIC package?

Pins 8 and 10 of the OP497FSZ are designated NC (No Connect) and must remain unconnected. These pins have no internal bond wires or silicon connections - they exist solely for mechanical symmetry and package compatibility. Routing traces or applying solder to them risks contamination or unintended coupling in high-impedance circuits.