Analog Devices Inc. OP497GS

Overview

OP497GS 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 min 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 and photodiode preamplifiers requiring ultra-low input current and long-term stability.

For engineers reviewing the OP497GS datasheet, OP497GS pinout, OP497GS application, or OP497GS equivalent, key selection criteria include guaranteed picoampere-level bias current across −40°C to +85°C, low 625 μA per-amplifier supply current, rail-to-rail input common-mode range (±13 V at ±15 V supplies), and validated performance in precision integrators, peak detectors, and battery-powered instrumentation.

Technical Context

The OP497GS employs a superbeta input stage with bias current cancellation, enabling stable <150 pA input bias current at 25°C and <300 pA over full temperature range-unlike FET-input op amps whose bias current doubles every 10°C. Its open-loop gain exceeds 2000 V/mV, ensuring high linearity in closed-loop gains up to 1000×.

Designed for high-impedance signal conditioning, the device supports input voltages up to ±13 V (at ±15 V supplies), achieves >120 dB CMR and PSRR at dc, and maintains 0.05 V/μs min slew rate with 500 kHz gain-bandwidth product-enabling accurate low-frequency integration and logarithmic conversion without thermal drift-induced errors.

Key Specifications

Pinout & Package

OP497GS is housed in a 16-lead wide-body SOIC (JEDEC MS-013-AA, package code RW-16), 10.5 mm × 7.6 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 quad precision op amp applications.

Compared with OP497FSZ-REEL, OP497GSZ-REEL1 offers identical performance in a different reel size-no design change needed. Versus LT1499ISW#PBF, OP497GS provides superior low-drift, low-bias-current performance essential for DC precision, though with reduced output voltage swing margin.

Availability

OP497GS is available at Aetrix Electronics and suitable for strain gage amplifiers, photocurrent monitors, and high-stability thermocouple amplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for OP497GS 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, headquartered in Norwood, MA, with decades of expertise in precision amplification and sensor interface ICs.

The OP497GS belongs to Analog Devices' precision op amp product line, engineered specifically for ultra-low-input-current, low-drift applications including instrumentation, scientific measurement, and battery-powered portable test equipment.

FAQ

What is the maximum input bias current specification for OP497GS over temperature?

The OP497GS has a maximum input bias current of 300 pA across the full operating temperature range of −40°C to +85°C. This value is guaranteed by production testing and reflects worst-case performance under specified supply and common-mode conditions. The 150 pA maximum at 25°C degrades predictably with temperature, remaining in the picoampere range-unlike FET-input op amps that rise into nanoamperes above 85°C. This makes OP497GS uniquely suited for long-duration integrators and high-impedance sensor interfaces where thermal drift must be minimized.

Does OP497GS support single-supply operation?

OP497GS is specified for dual-supply operation from ±2 V to ±20 V and does not support true single-supply operation with ground-referenced inputs. Its input common-mode range extends to within ~1 V of each rail, but the input stage requires symmetric positive and negative supplies to function correctly. For single-supply applications, users must generate a virtual ground or select an alternative rail-to-rail input op amp such as the AD8608. Attempting to operate OP497GS with V– tied to ground and V+ at +5 V will result in undefined behavior and potential damage due to violation of absolute maximum input voltage ratings.

What is the purpose of the NC pins (8 and 16) on OP497GS?

Pins 8 and 16 on OP497GS are designated No Connect (NC) and correspond to unused internal die pads with no electrical connection to the silicon. These pins must remain unconnected in PCB layout-neither grounded nor tied to supply rails. Routing traces to or placing vias on these pins may introduce parasitic capacitance or contamination paths that degrade input impedance or increase leakage current. The NC designation is confirmed in Figure 1 of the OP497 Rev. E datasheet and applies identically to all RW-16 packaged variants including OP497GS, OP497FS, and OP497GSZ-REEL1.

How does OP497GS achieve lower input bias current than FET-input op amps over temperature?

OP497GS uses a superbeta bipolar input stage with active bias current cancellation, rather than standard FET inputs. This architecture maintains input bias current below 300 pA from −40°C to +85°C because superbeta transistors exhibit inherently lower base current and the cancellation circuit dynamically offsets residual currents. In contrast, FET-input op amps start near 100 pA at 25°C but double every 10°C-reaching >1 nA at 125°C. This fundamental difference makes OP497GS the preferred choice for applications like thermocouple amplifiers and long-term integrators where consistent picoampere performance across temperature is non-negotiable.

Can OP497GS drive a 10 kΩ load while maintaining specified output swing?

Yes, OP497GS guarantees ±13 V output swing into a 10 kΩ load at ±15 V supplies, per Table 1 in the Rev. E datasheet. At lighter loads (e.g., 2 kΩ), swing improves to ±13.7 V. The device's output stage is designed to deliver ±25 mA short-circuit current, providing ample drive capability for standard instrumentation loads. However, driving capacitive loads >100 pF requires careful layout and may benefit from series output resistance (e.g., 10–50 Ω) to maintain stability, as shown in Figure 29's overshoot vs. load capacitance data. For purely resistive 10 kΩ loads, no external compensation is needed.