AD8644ARZ Equivalent & Substitute Parts

Part Overview

The AD8644ARZ is a general-purpose operational amplifier manufactured by Analog Devices Inc., featuring four independent circuits in a 14-SOIC surface-mount package. This rail-to-rail output amplifier is designed for applications requiring low-power, multi-channel signal conditioning and processing. The device is currently in active production status with 2200 units available in inventory.

Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters of the application. The AD8644ARZ operates across a 5V to 18V supply range with a slew rate of 7.5V/µs and gain bandwidth product of 5.5 MHz, establishing the baseline performance envelope for compatible alternatives.

Substiute Parts

AD8644ARZ

Analog Devices Inc.In Stock: 2287AD8644ARZ Datasheet

Current PartRFQ

TS914AIDT

STMicroelectronicsIn Stock: 17964TS914AIDT Datasheet

SimilarRFQ

TS914IDT

STMicroelectronicsIn Stock: 37148TS914IDT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AD8644ARZ are identified based on the following critical parameters that must align with the main device:

Mandatory Matching Parameters:

• Number of Circuits: 4 independent amplifier channels
• Output Type: Rail-to-Rail configuration
• Package / Case: 14-SOIC form factor (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Category: Linear Amplifiers

Allowable Parameter Variations: Substitute parts may operate within different electrical performance envelopes provided they maintain functional compatibility. The AD8644ARZ establishes a baseline with 5V to 18V supply operation, 7.5V/µs slew rate, and 5.5 MHz gain bandwidth product. Substitute devices with lower slew rates, reduced gain bandwidth products, or different supply voltage ranges remain valid alternatives if the application requirements do not mandate the higher performance specifications of the main part.

The TS914AIDT and TS914IDT from STMicroelectronics meet the core substitution criteria through identical package geometry, four-circuit configuration, and rail-to-rail output architecture. Both devices operate across a 2.7V to 16V supply range, which encompasses the lower portion of the AD8644ARZ supply envelope. The reduced slew rate (1V/µs versus 7.5V/µs) and lower gain bandwidth product (1.4 MHz versus 5.5 MHz) represent performance trade-offs that are acceptable in applications not requiring the higher dynamic response of the main part.

Parameter Comparison

Engineering Selection Recommendations

AD8644ARZ Selection Criteria: The AD8644ARZ is the primary choice for applications requiring the specified performance envelope: 5V to 18V supply operation, 7.5V/µs slew rate, and 5.5 MHz gain bandwidth product. This device is suitable for general-purpose signal conditioning where higher dynamic response and faster settling times are required. The part is active in production with established supply availability.

TS914AIDT Selection Criteria: The TS914AIDT is a valid substitute when application requirements permit operation within a 2.7V to 16V supply range and can tolerate reduced slew rate (1V/µs) and gain bandwidth product (1.4 MHz). This device offers extended operating temperature range (-40°C to 125°C) and automotive-grade qualification (AEC-Q100), making it suitable for automotive and industrial applications requiring temperature robustness. The TS914AIDT exhibits significantly lower input bias current (1 pA versus 80 nA) and reduced supply current (230 µA versus 800 µA), providing advantages in low-power applications. Input offset voltage is specified at 5 mV.

TS914IDT Selection Criteria: The TS914IDT is functionally equivalent to the TS914AIDT with identical electrical performance characteristics, supply range, and temperature rating. The primary distinction is input offset voltage specification at 10 mV, which represents a higher tolerance than the TS914AIDT. This device is suitable for applications where the increased offset voltage specification is acceptable. Both TS914 variants carry automotive-grade qualification and extended temperature range.

Compliance and Certification: All three devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The TS914 variants carry AEC-Q100 automotive qualification, providing additional assurance for applications requiring automotive-grade component reliability.

Frequently Asked Questions (FAQ)

Q: Can the TS914AIDT or TS914IDT be used as direct replacements for the AD8644ARZ in existing designs?

A: Direct replacement is possible only if the application does not require the higher slew rate (7.5V/µs) and gain bandwidth product (5.5 MHz) of the AD8644ARZ. The TS914 variants operate at 1V/µs slew rate and 1.4 MHz gain bandwidth product. If the design operates within the 2.7V to 16V supply range and does not demand fast transient response, the TS914 devices are functionally compatible. PCB layout and component placement remain unchanged due to identical 14-SOIC package geometry.

Q: What are the key performance differences between the AD8644ARZ and TS914 substitutes?

A: The AD8644ARZ provides higher slew rate (7.5V/µs versus 1V/µs) and higher gain bandwidth product (5.5 MHz versus 1.4 MHz), enabling faster signal processing and settling. The TS914 variants offer lower input bias current (1 pA versus 80 nA) and significantly reduced supply current (230 µA versus 800 µA per device), advantageous for battery-powered and low-power applications. The TS914 devices operate across a wider temperature range (-40°C to 125°C versus -20°C to 85°C) and carry automotive qualification.

Q: Are there differences between the TS914AIDT and TS914IDT?

A: Both devices are electrically and functionally identical except for input offset voltage specification. The TS914AIDT specifies 5 mV input offset voltage, while the TS914IDT specifies 10 mV. Selection between these variants depends on application offset voltage tolerance requirements. Both devices are packaged identically and carry the same automotive qualification and temperature rating.

Q: What supply voltage range considerations apply when substituting the TS914 devices?

A: The AD8644ARZ operates from 5V to 18V, while the TS914 variants operate from 2.7V to 16V. The TS914 devices cannot be used in applications requiring supply voltages above 16V. However, applications operating within the 5V to 16V range can use either device. Applications requiring 17V or 18V supply operation must use the AD8644ARZ.

Q: Do the TS914 substitutes require different PCB layout or thermal management?

A: No. Both the AD8644ARZ and TS914 variants use identical 14-SOIC package geometry (0.154", 3.90mm width). PCB footprints, trace routing, and component placement remain unchanged. The TS914 devices generate less heat due to lower supply current (230 µA versus 800 µA), potentially reducing thermal management requirements in power-sensitive applications.

Q: Are the TS914 devices suitable for automotive applications?

A: Yes. Both TS914AIDT and TS914IDT carry AEC-Q100 automotive qualification and are specified for -40°C to 125°C operating temperature range, making them suitable for automotive and industrial applications. The AD8644ARZ does not carry automotive qualification and operates over a narrower temperature range (-20°C to 85°C).

Q: What is the significance of the CMOS amplifier type designation for the TS914 devices?

A: The TS914 devices are CMOS-based amplifiers, while the AD8644ARZ is designated as general-purpose. This architectural difference results in the lower input bias current (1 pA) and reduced supply current of the TS914 variants. CMOS architecture is inherently lower-power and suitable for battery-powered and low-power applications, though with reduced slew rate and gain bandwidth product compared to the AD8644ARZ.