OP491GSZ Equivalent & Substitute Parts

Part Overview

The OP491GSZ is a general-purpose operational amplifier manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as Active product status and is RoHS3 compliant. The OP491GSZ serves applications requiring low-power, multi-channel amplification with rail-to-rail output capability across industrial and consumer electronics. Substitute parts are identified when equivalent functional performance is required but alternative packaging, performance characteristics, or supply availability necessitate component replacement.

Substiute Parts

OP491GSZ

Analog Devices Inc.In Stock: 20179OP491GSZ Datasheet

Current PartRFQ

ADA4091-4ARUZ

Analog Devices Inc.In Stock: 2150ADA4091-4ARUZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the OP491GSZ is determined by the following criteria:

Functional Equivalence Requirements:

• Manufacturer: Analog Devices Inc.
• Amplifier Type: General Purpose
• Number of Circuits: 4
• Output Type: Rail-to-Rail
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C to 125°C
• Product Status: Active
• Compliance: RoHS3 Compliant

Allowable Variations:

• Package / Case format (14-SOIC to 14-TSSOP)
• Slew Rate (0.5 V/µs to 0.46 V/µs)
• Gain Bandwidth Product (3 MHz to 1.27 MHz)
• Current - Input Bias (30 nA to 50 nA)
• Voltage - Input Offset (80 µV to 35 µV)
• Current - Supply (260 µA to 200 µA per 4 channels)
• Current - Output / Channel (16 mA to 20 mA)
• Voltage - Supply Span (2.7 V to 3 V minimum; 12 V to 30 V maximum)

The ADA4091-4ARUZ qualifies as a substitute part based on identical functional classification, circuit count, output characteristics, and compliance status, with package format and electrical performance variations within acceptable substitution parameters.

Parameter Comparison

Engineering Selection Recommendations

OP491GSZ Selection Criteria: The OP491GSZ is the primary component choice for applications requiring the specified 14-SOIC package format with 2.7 V to 12 V supply range. This device maintains Active product status with full RoHS3 compliance and REACH unaffected designation. The 3 MHz gain bandwidth product and 0.5 V/µs slew rate support higher-frequency signal processing within the defined supply constraints.

ADA4091-4ARUZ Selection Criteria: The ADA4091-4ARUZ serves as a functional substitute when 14-TSSOP package format is required or when extended supply voltage range (3 V to 30 V) is necessary. This device maintains identical Active product status and RoHS3 compliance. The lower supply current (200 µA versus 260 µA) and improved input offset voltage (35 µV versus 80 µV) provide advantages in power-constrained and precision-sensitive applications. The reduced gain bandwidth product (1.27 MHz) and slew rate (0.46 V/µs) reflect lower-frequency operation capability.

Both devices are manufactured by Analog Devices Inc., classified as general-purpose 4-circuit rail-to-rail amplifiers, and operate across the -40°C to 125°C temperature range. Selection between these parts depends on PCB layout constraints (package footprint), supply voltage requirements, and application bandwidth specifications.

Frequently Asked Questions (FAQ)

Q: Can the ADA4091-4ARUZ directly replace the OP491GSZ on an existing PCB?

A: Direct PCB replacement is not possible due to package format differences. The OP491GSZ uses 14-SOIC (0.154" width, 3.90mm) while the ADA4091-4ARUZ uses 14-TSSOP (0.173" width, 4.40mm). PCB layout redesign is required for component substitution.

Q: What are the key electrical differences between these parts?

A: The ADA4091-4ARUZ provides extended supply voltage range (3 V to 30 V versus 2.7 V to 12 V), lower supply current consumption (200 µA versus 260 µA), and superior input offset voltage (35 µV versus 80 µV). The OP491GSZ offers higher gain bandwidth product (3 MHz versus 1.27 MHz) and faster slew rate (0.5 V/µs versus 0.46 V/µs).

Q: Are both parts suitable for the same temperature operating range?

A: Yes. Both the OP491GSZ and ADA4091-4ARUZ operate across -40°C to 125°C, ensuring equivalent thermal performance across industrial and commercial temperature specifications.

Q: What compliance certifications apply to both devices?

A: Both devices are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture sensitivity level is 1 (Unlimited) for both parts, indicating no moisture-related handling restrictions.

Q: Which part should be selected for low-power applications?

A: The ADA4091-4ARUZ is preferred for power-constrained designs, consuming 200 µA total supply current compared to 260 µA for the OP491GSZ, representing a 23% reduction in power consumption.

Q: Which part supports higher supply voltages?

A: The ADA4091-4ARUZ supports supply voltages up to 30 V, compared to 12 V maximum for the OP491GSZ. Applications requiring extended supply voltage range must use the ADA4091-4ARUZ.

Q: Are both parts available in production quantities?

A: Both devices maintain Active product status. Inventory availability varies; verify current stock levels with your supplier for specific procurement timelines.