Analog Devices Inc. OP497FS

Overview

OP497FS from Analog Devices is a precision quad operational amplifier optimized for ultra-low input bias current (≤150 pA at 25°C), low offset voltage (≤75 μV), and high open-loop gain (≥2000 V/mV), operating from ±2 V to ±20 V supplies. It serves as a signal-conditioning front-end in high-impedance sensor interfaces including strain gage bridges, thermocouple amplifiers, and photocurrent monitors.

For engineers reviewing the OP497FS datasheet, OP497FS pinout, OP497FS application, or OP497FS equivalent, this page delivers verified specifications, SOIC_W package details, real-world use cases, and validated alternative options - all grounded in Analog Devices' Rev. E datasheet and official ordering guide.

Technical Context

The OP497FS employs a superbeta input stage with bias current cancellation to maintain picoampere-level input bias across −40°C to +85°C, avoiding the exponential temperature drift seen in FET-input op amps. Its differential input resistance exceeds 30 MΩ and common-mode input resistance reaches 500 GΩ.

It delivers 114 dB minimum CMRR and PSRR, supports rail-to-rail input common-mode range (within 1 V of rails), and achieves stable unity-gain operation with up to 1000 pF capacitive load - enabling robust performance in precision integrators, peak detectors, and logarithmic amplifiers without external compensation.

Key Specifications

Pinout & Package

OP497FS is packaged in a 16-lead wide-body SOIC (JEDEC MS-013-AA, package option RW-16), measuring 10.50 mm × 7.60 mm × 2.35 mm with 1.27 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OP497FS, OP491FSZ trades picoampere input bias for higher bandwidth and lower cost, while AD8628ARUZ-REEL offers superior offset but lacks quad integration and dual-supply flexibility - making OP497FS uniquely suited for multi-channel, ultra-high-impedance, wide-supply analog front-ends.

Availability

OP497FS is available at Aetrix Electronics and suitable for strain gage amplification, photocurrent monitoring, and thermocouple signal conditioning requiring stable component supply across industrial, test & measurement, and medical instrumentation programs.

Supply support for OP497FS 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, serving precision instrumentation, industrial automation, and aerospace markets since 1965.

The OP497FS belongs to Analog Devices' precision op amp product line, engineered specifically for ultra-low-input-bias, low-drift, multi-channel signal conditioning in high-impedance sensor systems.

FAQ

What is the maximum operating temperature range for the OP497FS?

The OP497FS is rated for continuous operation from −40°C to +85°C, as confirmed in the Analog Devices Rev. E datasheet Absolute Maximum Ratings and Ordering Guide. This range applies to both parametric performance and reliability validation; all key specs - including input bias current (≤300 pA) and offset voltage drift (≤1.0 μV/°C) - are guaranteed across this full industrial temperature span. The device's superbeta input stage ensures stable pA-level bias even at +85°C, distinguishing it from FET-input alternatives.

Does the OP497FS support single-supply operation?

Yes, the OP497FS supports true single-supply operation down to +4 V total supply (e.g., V+ = +4 V, V− = 0 V), per its ±2 V minimum dual-supply rating. Its input common-mode range extends to within 1 V of either rail, and output swing reaches within 1 V of the rails with 10 kΩ load - enabling direct interface with 0–3.3 V or 0–5 V ADCs. However, optimal precision performance (e.g., min offset, max CMRR) is specified under symmetric ±15 V conditions; design margins must be verified for specific single-supply configurations.

What is the purpose of the NC pins on the OP497FS SOIC package?

Pins 8 and 10 on the OP497FS (16-lead SOIC_W) are designated NC (No Connect) and are not bonded to the die - they serve no electrical function and must remain unconnected on the PCB. These pins exist due to package standardization (RW-16 footprint compatibility) and do not require grounding, pulling, or routing. Leaving them floating poses no risk; soldering or routing to them may cause mechanical stress or unintended coupling. This NC assignment is explicitly shown in Figure 1 of the Rev. E datasheet and confirmed in the Pin Connections section.

How does the OP497FS achieve low input bias current across temperature?

The OP497FS uses a proprietary superbeta bipolar input stage with active bias current cancellation - not FET inputs - to maintain ≤150 pA at 25°C and ≤300 pA across −40°C to +85°C. Unlike JFET or MOSFET op amps whose bias current doubles every 10°C, the OP497FS's bipolar structure avoids thermal runaway via matched transistor pairs and cancellation circuitry. This is documented in the General Description (page 1) and Figure 3 (Input Bias vs. Temperature), confirming stable pA operation where FET-input devices degrade into nanoamp range above 85°C.

Can the OP497FS drive heavy capacitive loads without oscillation?

Yes, the OP497FS is explicitly characterized for stable unity-gain operation with up to 1000 pF capacitive load, as shown in Figure 31 of the Rev. E datasheet (Small Signal Transient Response, C_LOAD = 1000 pF). Its internal compensation and low output impedance (<100 Ω typical at DC) prevent peaking or ringing. For loads >1000 pF, a series isolation resistor (e.g., 10–50 Ω) between output and capacitance is recommended - but no external compensation capacitor is needed for standard photodiode or cable-driven applications within this limit.