Analog Devices Inc. OP90GPZ

Overview

OP90GPZ from Analog Devices is a precision low-voltage micropower operational amplifier in 8-lead PDIP package, featuring 150 µV max input offset voltage, 20 µA max supply current, and rail-to-rail output swing down to ground in single-supply operation (1.6 V to 36 V). It enables zero-in/zero-out signal conditioning in battery-powered remote sensors and portable instrumentation.

For engineers reviewing the OP90GPZ datasheet, OP90GPZ pinout, OP90GPZ application, or OP90GPZ equivalent, key selection criteria include micropower quiescent current (<20 µA), true single-supply input/output range including ground, high open-loop gain (>700 V/mV), and compatibility with precision nulling circuits for offset trimming.

Technical Context

The OP90GPZ uses a PNP-input stage with series protection resistors enabling ±20 V input overvoltage tolerance beyond rails. Its active pull-down output stage supports true ground-referenced operation in single-supply configurations, with output swing to within 100 µV of ground under light load.

Offset nulling is implemented via dedicated pins (Pin 1 and Pin 8) tied to an internal differential pair; external 100 kΩ potentiometer provides up to 6 mV adjustment range without degrading temperature drift performance (TCVOS ≤ 2.5 µV/°C).

Key Specifications

Pinout & Package

OP90GPZ is housed in an 8-lead plastic dual in-line package (PDIP, N-8), 0.300-inch wide body, RoHS-compliant (Pb-free lead finish).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OP90GPZ, OP290GPZ offers channel integration at identical precision and package compatibility, while LTC1050CN8#PBF trades 6× higher supply current for chopper-level offset performance - making OP90GPZ optimal for cost-sensitive, battery-limited, through-hole designs requiring 150 µV offset and 20 µA operation.

Availability

OP90GPZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, remote environmental sensors, and portable medical devices requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for OP90GPZ 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 design centers worldwide.

The OP90GPZ belongs to Analog Devices' precision micropower op amp product line, engineered specifically for ultra-low-power, single-supply signal conditioning in portable and energy-constrained systems.

FAQ

What is the maximum supply voltage rating for OP90GPZ?

The OP90GPZ has an absolute maximum supply voltage rating of ±18 V for dual supply or 36 V for single supply. Operation beyond these limits risks permanent damage. The recommended operating range is 1.6 V to 36 V single supply or ±0.8 V to ±18 V dual supply, as specified in the Electrical Characteristics table on Page 2 of the OP90 Rev. C datasheet. This rating applies to packaged parts and assumes proper PCB layout and thermal management.

Does OP90GPZ support true rail-to-rail input and output operation?

The OP90GPZ supports rail-to-rail output swing down to within 100 µV of ground (V–) with RL ≥ 10 kΩ, and input common-mode range includes the negative rail - enabling true "zero-in, zero-out" operation in single-supply configurations. However, its input does not reach the positive rail (V+); the maximum input voltage is limited to V+ – 1.5 V. This behavior is confirmed in the Input Voltage Range (IVR) specification (0 V to 3.5 V at V+ = 5 V) and Figure 1's simplified schematic showing PNP input stage limitations.

Can OP90GPZ be used without external offset nulling components?

Yes, OP90GPZ can be used without external nulling components: its input offset voltage is guaranteed ≤150 µV at 25°C and ≤400 µV over –40°C to +85°C, which suffices for many precision applications. Nulling (via Pins 1 and 8) is optional and only required when sub-100 µV offset is needed. The datasheet states that external nulling does not degrade TCVOS performance, and the internal offset is electronically adjusted on-chip for minimum baseline error - eliminating mandatory trimming in most use cases.

What is the capacitive load drive capability of OP90GPZ?

The OP90GPZ is stable driving up to 650 pF capacitive load with AV = 1 (unity-gain configuration), as verified in the Capacitive Load Stability specification (Page 3, Rev. C). This capability enables direct driving of ADC input capacitors, long cables, or RC filters without external isolation resistors. For loads exceeding 650 pF, a series resistor (typically 10–100 Ω) between OP90GPZ output and the capacitive load restores stability, as confirmed by transient response testing in TPC 14 and TPC 15.

Is OP90GPZ suitable for overvoltage-protected sensor front-ends?

Yes, OP90GPZ is explicitly designed for overvoltage-protected front-ends: its PNP input stage with integrated series protection resistors allows inputs to safely withstand voltages up to ±20 V beyond either supply rail without damage or phase reversal. This is documented in the Absolute Maximum Ratings table (Page 5) and Application Information section (Page 8), making it suitable for industrial transducer interfaces where ESD or wiring faults may expose inputs to transient overvoltages.