Analog Devices Inc. OP297FPZ

Overview

OP297FPZ from Analog Devices is a dual precision operational amplifier optimized for low-bias-current, high-accuracy signal conditioning in instrumentation-grade circuits. It delivers 50 μV max input offset voltage, 0.6 μV/°C max drift, and 100 pA max input bias current at 25°C - enabling stable microvolt-level amplification in strain gage bridges and thermocouple interfaces.

For engineers reviewing the OP297FPZ datasheet, OP297FPZ pinout, OP297FPZ application, or OP297FPZ equivalent, this page provides verified specifications, validated SOIC-8 pin mapping, real-world application context for precision analog systems, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The OP297FPZ employs a super-beta bipolar input stage with bias current cancellation, maintaining sub-450 pA bias current across −40°C to +85°C - unlike FET-input op amps whose bias current doubles per 10°C rise. Its open-loop gain exceeds 2000 V/mV (126 dB), ensuring <0.001% gain error in high-closed-loop-gain configurations.

With 120 dB minimum CMRR and PSRR, it rejects supply and common-mode disturbances critical in battery-powered and bridge-sensor systems. The device operates from ±2 V to ±20 V supplies and achieves rail-to-rail input common-mode range (±13 V) and output swing (±13 V into 10 kΩ).

Key Specifications

Pinout & Package

OP297FPZ is housed in an 8-lead PDIP (Plastic Dual In-Line Package) with 0.300-inch body width, compliant with JEDEC MS-001 standard. Pin 1 is located at the left end of the top row when viewed from the top with the notch or dot oriented upward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OP2177ARZ and AD8628ARZ, the OP297FPZ uniquely combines picoamp-level bias current stability across −40°C to +85°C, 50 μV offset, and 2000 V/mV gain - making it the only option qualified for uncalibrated, wide-temperature, high-impedance sensor interfacing without performance degradation.

Availability

OP297FPZ is available at Aetrix Electronics and suitable for strain gage amplifiers, thermocouple signal conditioners, and long-term integrators requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OP297FPZ 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 industrial, automotive, communications, and healthcare markets since 1965.

The OP297FPZ belongs to Analog Devices' precision op amp product line, engineered specifically for low-drift, low-bias-current signal conditioning in sensor interfaces, instrumentation, and data acquisition systems where long-term stability and temperature robustness are mandatory.

FAQ

What is the maximum operating temperature range for the OP297FPZ?

The OP297FPZ is rated for operation from −40°C to +85°C, matching the industrial temperature grade specified in the ordering guide. Its input bias current remains ≤450 pA across this full range, and offset voltage drift is guaranteed at ≤2.0 μV/°C - enabling reliable performance in outdoor or factory-floor environments without thermal recalibration.

Does the OP297FPZ support single-supply operation?

Yes, the OP297FPZ supports single-supply operation with a minimum total supply voltage of 4 V (e.g., 0 V and +4 V). Its input common-mode range extends to within 1 V of either rail, and output swings to within 1 V of the rails into 10 kΩ - allowing use in 5 V or 3.3 V systems when biased appropriately, though dual-supply ±2 V to ±20 V is its native configuration.

Is the OP297FPZ pin-compatible with other dual op amps in PDIP-8 packages?

No - while the OP297FPZ uses the industry-standard 8-lead PDIP footprint, its pinout (V− on Pin 4, V+ on Pin 8) differs from legacy dual op amps like the LM358 (V− on Pin 4, V+ on Pin 8 is same, but output/inverting/non-inverting assignments differ). Direct replacement requires schematic and layout verification; it is not a drop-in substitute for LM358 or TL082.

How does the OP297FPZ achieve low input bias current over temperature?

The OP297FPZ uses a super-beta bipolar input stage with active bias current cancellation circuitry - not FET inputs. This architecture holds input bias current ≤450 pA across −40°C to +85°C, avoiding the exponential doubling seen in JFET op amps. Data Sheet Figure 8 confirms IB remains flat versus temperature, unlike FET-based alternatives that exceed 1 nA above 70°C.

Can the OP297FPZ drive capacitive loads without instability?

Yes - the OP297FPZ is highly tolerant of capacitive loading, exhibiting stable small-signal transient response with up to 1000 pF (Figure 27 in datasheet). For loads >100 pF, adding a 10 Ω to 50 Ω series resistor between output and capacitance restores optimal phase margin without degrading DC accuracy - a key advantage in PCB trace or cable-driven applications.