AD8698ARZ Equivalent & Substitute Parts

Part Overview

The AD8698ARZ is a general-purpose operational amplifier manufactured by Analog Devices Inc., featuring dual circuits in a rail-to-rail configuration housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The AD8698ARZ operates across a supply voltage range of 5V to 30V with a slew rate of 0.4V/µs and gain bandwidth product of 1 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth performance.

Substiute Parts

AD8698ARZ

Analog Devices Inc.In Stock: 2376AD8698ARZ Datasheet

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AD8622ARZ

Analog Devices Inc.In Stock: 4341AD8622ARZ Datasheet

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LT1881AIS8

Analog Devices Inc.In Stock: 1578LT1881AIS8 Datasheet

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LT1881CS8

Analog Devices Inc.In Stock: 2463LT1881CS8 Datasheet

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LT1881IS8

Analog Devices Inc.In Stock: 2265LT1881IS8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD8698ARZ is determined by the following critical parameters: dual-circuit configuration, general-purpose amplifier classification, rail-to-rail output capability, 8-SOIC surface mount package, and supply voltage compatibility within the 5V to 30V range. The identified substitute parts maintain these core functional and physical characteristics while offering improvements in product status, compliance certifications, and certain electrical performance metrics.

The substitution logic is based on:

• Circuit Configuration: Dual operational amplifier in single package
• Output Architecture: Rail-to-rail output capability
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) surface mount form factor
• Supply Voltage Range: Minimum 5V to maximum 30V operation
• Amplifier Classification: General-purpose operational amplifier
• Mounting Technology: Surface mount assembly compatibility

Parameter Comparison

Engineering Selection Recommendations

AD8622ARZ is the primary direct substitute for the AD8698ARZ. Both devices are manufactured by Analog Devices Inc. and share identical package specifications (8-SOIC). The AD8622ARZ is an active product with ROHS3 compliance and REACH unaffected status, addressing the obsolescence of the original part. The AD8622ARZ demonstrates superior input bias current performance (45 pA versus 700 pA) and lower input offset voltage (10 µV versus 20 µV), while maintaining compatible supply voltage range (5V to 30V). The AD8622ARZ operates across an extended temperature range (-40°C to 125°C) compared to the AD8698ARZ (-40°C to 85°C).

LT1881IS8 serves as an alternative substitute with active product status and ROHS3 compliance. This device maintains the same slew rate (0.4V/µs) and operating temperature range (-40°C to 85°C) as the AD8698ARZ. The LT1881IS8 offers an extended maximum supply voltage (36V versus 30V) and improved input bias current characteristics (150 pA versus 700 pA). The gain bandwidth product of 850 kHz is lower than the AD8698ARZ (1 MHz), representing a trade-off in frequency response.

LT1881AIS8 and LT1881CS8 are additional LT® series alternatives with active status and full compliance certifications. The LT1881AIS8 provides the lowest input bias current among LT1881 variants (100 pA) and operates across the widest supply voltage range (2.7V to 36V). The LT1881CS8 operates within a narrower commercial temperature range (0°C to 70°C), suitable for non-industrial applications.

Selection between these substitutes depends on specific application requirements regarding supply voltage range, temperature operating conditions, and input bias current specifications. All identified substitutes maintain the critical dual-circuit, rail-to-rail, 8-SOIC package configuration necessary for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can the AD8622ARZ directly replace the AD8698ARZ in existing designs?

A: The AD8622ARZ is a direct substitute from a package and functional perspective. Both devices feature dual general-purpose operational amplifiers in 8-SOIC surface mount packages with rail-to-rail output capability. The AD8622ARZ operates within the same 5V to 30V supply voltage range and maintains compatible pinout configuration. The primary differences are improved electrical performance characteristics (lower input bias current and input offset voltage) and extended operating temperature range, which are generally beneficial for system performance.

Q: What are the key differences between the AD8622ARZ and LT1881 series substitutes?

A: The AD8622ARZ and LT1881 series (LT1881AIS8, LT1881CS8, LT1881IS8) differ primarily in supply current consumption and gain bandwidth product. The AD8622ARZ consumes significantly less supply current (215µA per dual channels) compared to LT1881 variants (850µA per dual channels). The AD8622ARZ offers lower gain bandwidth product (560 kHz) than LT1881 series (850 kHz). The LT1881 series provides extended maximum supply voltage capability (36V versus 30V). Both families maintain identical package specifications and rail-to-rail output architecture.

Q: Are all substitute parts ROHS3 compliant?

A: All identified substitute parts (AD8622ARZ, LT1881AIS8, LT1881CS8, LT1881IS8) are ROHS3 compliant and REACH unaffected. The original AD8698ARZ does not specify compliance status. This compliance certification is a significant advantage for new designs and production environments subject to environmental regulations.

Q: Which substitute is best for low-power applications?

A: The AD8622ARZ is the optimal choice for low-power applications, consuming only 215µA across both channels compared to 850µA for LT1881 series devices. This represents approximately 75% reduction in supply current consumption, making the AD8622ARZ suitable for battery-powered and energy-constrained systems.

Q: What is the impact of different gain bandwidth products on circuit design?

A: The AD8698ARZ specifies 1 MHz gain bandwidth product, while substitute parts range from 560 kHz (AD8622ARZ) to 850 kHz (LT1881 series). Lower gain bandwidth product limits the maximum frequency response of the amplifier. Applications requiring high-frequency signal processing or wide bandwidth performance should account for these differences in circuit design and stability analysis. The AD8622ARZ with 560 kHz bandwidth is suitable for audio and low-frequency signal conditioning applications.

Q: Can LT1881CS8 be used in industrial temperature range applications?

A: The LT1881CS8 operates within a commercial temperature range of 0°C to 70°C and is not suitable for industrial temperature range applications (-40°C to 85°C or extended ranges). For industrial applications, the AD8622ARZ (-40°C to 125°C), LT1881AIS8 (-40°C to 85°C), or LT1881IS8 (-40°C to 85°C) are appropriate selections.

Q: Are the package dimensions identical across all substitute parts?

A: All substitute parts utilize the 8-SOIC (0.154", 3.90mm Width) surface mount package, maintaining identical physical dimensions and PCB footprint compatibility with the AD8698ARZ. This ensures direct mechanical compatibility without requiring PCB layout modifications.

Q: What is the significance of input bias current differences between substitutes?

A: Input bias current affects circuit accuracy and noise performance. The AD8698ARZ specifies 700 pA input bias current, while substitutes range from 45 pA (AD8622ARZ) to 150 pA (LT1881 series). Lower input bias current reduces errors in high-impedance circuits and improves overall system accuracy. The AD8622ARZ provides the most significant improvement in this parameter.