AD8566ARMZ-R2 Equivalent & Substitute Parts

Part Overview

The AD8566ARMZ-R2 is a general-purpose operational amplifier manufactured by Analog Devices Inc., featuring dual circuits in a rail-to-rail configuration housed in an 8-MSOP surface mount package. This device is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part operates across a supply voltage range of 4.5 V to 16 V with an operating temperature range of -40°C to 85°C, making it suitable for general-purpose analog signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	6	V/µs
Gain Bandwidth Product	5	MHz
Current - Input Bias	80	nA
Voltage - Input Offset	2	mV
Current - Supply (x2 Channels)	700	µA
Current - Output / Channel	35	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD8566ARMZ-R2 is determined by the following critical parameters: dual-circuit configuration, rail-to-rail output capability, surface mount packaging in 8-MSOP form factor, and compatible supply voltage range. The substitute parts identified maintain these core electrical and mechanical characteristics while offering variations in amplifier type (CMOS versus general purpose), slew rate, gain bandwidth product, and supply current specifications.

The substitution logic is structured as follows:

Primary Substitutes (Analog Devices Inc. - Same Manufacturer): The ADA4666-2ARMZ-RL maintains the same manufacturer ecosystem, dual-circuit configuration, rail-to-rail output, and 8-MSOP packaging. This part operates across an extended supply voltage range (3 V to 18 V) and temperature range (-40°C to 125°C), with significantly lower input bias current (0.5 pA) and higher output current capability (220 mA per channel).

Secondary Substitutes (STMicroelectronics - TSX632 Series): The TSX632AIST, TSX632IST, TSX632AIYST, and TSX632IYST maintain dual-circuit configuration, rail-to-rail output, and compatible packaging. These parts feature ultra-low supply current (45 µA) and extended temperature range (-40°C to 125°C). The TSX632AIYST and TSX632IYST variants include automotive-grade qualification (AEC-Q100).

Extended Substitute (STMicroelectronics - TSX9292IST): The TSX9292IST provides higher performance characteristics with increased slew rate (27 V/µs) and gain bandwidth product (16 MHz), automotive-grade qualification (AEC-Q100), and maintains dual-circuit, rail-to-rail configuration in compatible packaging.

Parameter Comparison

Parameter	AD8566ARMZ-R2	ADA4666-2ARMZ-RL	TSX632AIST	TSX632IST	TSX632AIYST	TSX632IYST	TSX9292IST
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Amplifier Type	General Purpose	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	2	2	2	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	6	2	0.12	0.12	0.12	0.12	27
Gain Bandwidth Product (MHz)	5	4	0.2	0.2	0.2	0.2	16
Current - Input Bias (pA/nA)	80 nA	0.5 pA	1 pA	1 pA	1 pA	1 pA	10 pA
Voltage - Input Offset (mV/µV)	2 mV	500 µV	700 µV	1.6 mV	700 µV	1.6 mV	4 mV
Current - Supply (µA/mA)	700 µA	630 µA	45 µA	45 µA	45 µA	45 µA	2.8 mA
Current - Output / Channel (mA)	35	220	92	92	92	92	74
Voltage - Supply Span (Min)	4.5 V	3 V	3.3 V	3.3 V	3.3 V	3.3 V	4 V
Voltage - Supply Span (Max)	16 V	18 V	16 V	16 V	16 V	16 V	16 V
Operating Temperature (°C)	-40 to 85	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade / AEC-Q100	—	—	—	—	Yes	Yes	Yes

Engineering Selection Recommendations

For Direct Replacement with Extended Capabilities: The ADA4666-2ARMZ-RL is the primary substitute from Analog Devices Inc., maintaining the same manufacturer lineage and ecosystem. This part is currently active in production with ROHS3 compliance. It provides superior input bias current performance (0.5 pA versus 80 nA), significantly higher output current capability (220 mA per channel versus 35 mA), and an extended operating temperature range (-40°C to 125°C). The supply voltage range is also extended (3 V to 18 V), providing greater design flexibility. The trade-off is a reduced slew rate (2 V/µs versus 6 V/µs) and gain bandwidth product (4 MHz versus 5 MHz).

For Ultra-Low Power Applications: The TSX632 series (TSX632AIST, TSX632IST, TSX632AIYST, TSX632IYST) from STMicroelectronics offers exceptional supply current reduction (45 µA versus 700 µA), making these parts suitable for battery-powered or energy-constrained applications. These parts maintain compatible packaging and dual-circuit, rail-to-rail configuration. The TSX632AIYST and TSX632IYST variants include automotive-grade qualification (AEC-Q100), suitable for automotive applications. The trade-off is significantly reduced slew rate (0.12 V/µs) and gain bandwidth product (200 kHz), limiting use to low-frequency signal conditioning.

For High-Performance Applications: The TSX9292IST provides the highest performance characteristics with slew rate of 27 V/µs and gain bandwidth product of 16 MHz, exceeding the original AD8566ARMZ-R2 specifications. This part includes automotive-grade qualification (AEC-Q100) and maintains compatible packaging. The trade-off is increased supply current (2.8 mA per channel) and higher input offset voltage (4 mV).

Compliance and Availability: All active substitute parts are ROHS3 compliant and REACH unaffected. The TSX632AIYST, TSX632IYST, and TSX9292IST variants carry AEC-Q100 automotive qualification, suitable for automotive and mission-critical applications. Current inventory levels are substantial across all substitute options, ensuring production continuity.

Frequently Asked Questions (FAQ)

Q: Can the ADA4666-2ARMZ-RL be used as a direct pin-for-pin replacement for the AD8566ARMZ-R2?

A: Yes. Both parts feature identical dual-circuit configuration, rail-to-rail output, and 8-MSOP surface mount packaging with the same pinout. The ADA4666-2ARMZ-RL is electrically compatible and can be substituted without PCB modifications. However, the reduced slew rate (2 V/µs versus 6 V/µs) and gain bandwidth product (4 MHz versus 5 MHz) must be verified against circuit performance requirements.

Q: What is the primary advantage of the TSX632 series over the original AD8566ARMZ-R2?

A: The TSX632 series offers dramatically reduced supply current consumption (45 µA versus 700 µA), approximately 15 times lower. This makes the TSX632 series suitable for battery-powered applications and systems with strict power budgets. The trade-off is significantly reduced slew rate and gain bandwidth product, limiting these parts to low-frequency applications below 200 kHz.

Q: Are the TSX632AIYST and TSX632IYST suitable for automotive applications?

A: Yes. Both the TSX632AIYST and TSX632IYST carry automotive-grade qualification and AEC-Q100 certification, meeting automotive industry standards. These parts are suitable for automotive signal conditioning, sensor interface, and control applications operating across the -40°C to 125°C temperature range.

Q: What is the difference between TSX632AIST and TSX632IST?

A: Both parts are functionally equivalent CMOS dual-circuit amplifiers in 8-MiniSO packaging. The primary difference is voltage input offset specification: TSX632AIST specifies 700 µV maximum, while TSX632IST specifies 1.6 mV maximum. For applications requiring tighter input offset tolerance, the TSX632AIST is the appropriate selection. Both parts are available in Cut Tape and Digi-Reel packaging.

Q: Can the TSX9292IST be used in place of the AD8566ARMZ-R2 for high-speed applications?

A: Yes. The TSX9292IST provides superior high-frequency performance with slew rate of 27 V/µs and gain bandwidth product of 16 MHz, both exceeding the original part specifications. The TSX9292IST maintains compatible 8-MSOP packaging and dual-circuit, rail-to-rail configuration. The increased supply current (2.8 mA per channel) and higher input offset voltage (4 mV) must be evaluated against circuit requirements.

Q: Are all substitute parts available in the same packaging as the AD8566ARMZ-R2?

A: Yes. All substitute parts are available in 8-TSSOP and 8-MSOP surface mount packages with 0.118" (3.00mm) width, maintaining mechanical compatibility with the original AD8566ARMZ-R2 footprint. Verify specific supplier device package designations (8-MSOP versus 8-MiniSO) for exact footprint compatibility with existing PCB designs.

Q: What is the operating temperature range difference between the AD8566ARMZ-R2 and substitute parts?

A: The original AD8566ARMZ-R2 operates from -40°C to 85°C. All substitute parts extend the upper temperature limit to 125°C, providing improved thermal margin for applications in elevated ambient conditions. The lower temperature limit remains -40°C across all parts.

Q: Which substitute part offers the best balance of performance and power consumption?

A: The ADA4666-2ARMZ-RL provides the best overall balance, offering comparable slew rate and gain bandwidth product to the original part while reducing supply current from 700 µA to 630 µA. It also provides superior input bias current (0.5 pA) and higher output current capability (220 mA per channel), with extended supply voltage range (3 V to 18 V) and temperature range (-40°C to 125°C).

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