AD623AR Equivalent & Substitute Parts

Part Overview

The AD623AR is an instrumentation amplifier manufactured by Analog Devices Inc., designed for single-circuit rail-to-rail applications in the 8-SOIC surface mount package. The device operates across a supply voltage range of 2.7V to 12V with an operating temperature range of -40°C to 85°C. The AD623AR is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Amplifier Type	Instrumentation
Number of Circuits	1
Output Type	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply Span (Min)	2.7 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C ~ 85°C
Slew Rate	0.3V/µs
-3dB Bandwidth	800 kHz
Current - Input Bias	17 nA
Voltage - Input Offset	25 µV
Current - Supply	375µA
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AD623AR is determined by compatibility across the following critical parameters: amplifier type (instrumentation vs. differential), number of circuits (single circuit requirement), package type (8-SOIC form factor), mounting method (surface mount), and electrical operating ranges (supply voltage and temperature).

The substitute parts are grouped into two categories:

Direct Equivalent (Identical Amplifier Type): AD623ARZ maintains the instrumentation amplifier topology with identical electrical specifications and rail-to-rail output characteristics. This part differs only in packaging format (tube vs. unspecified for the main part) and product status (active vs. obsolete).

Functional Alternatives (Enhanced Performance): AD8226ARZ is an instrumentation amplifier with improved electrical performance characteristics, including higher slew rate (0.6V/µs vs. 0.3V/µs), increased bandwidth (1.5 MHz vs. 800 kHz), and extended maximum supply voltage (36V vs. 12V). This part maintains the same package and mounting type but operates across a wider temperature range (-40°C to 125°C).

Cross-Topology Alternatives (Differential Amplifier): INA149AID and INA149AIDR are differential amplifiers manufactured by Texas Instruments. These parts share the 8-SOIC package and surface mount configuration but differ in amplifier topology (differential vs. instrumentation), electrical performance, and supply voltage requirements (4V to 36V minimum vs. 2.7V).

Parameter Comparison

Parameter	AD623AR	AD623ARZ	AD8226ARZ	INA149AID	INA149AIDR
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments
Amplifier Type	Instrumentation	Instrumentation	Instrumentation	Differential	Differential
Number of Circuits	1	1	1	1	1
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.2 V	4 V	4 V
Voltage - Supply Span (Max)	12 V	12 V	36 V	36 V	36 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Slew Rate	0.3V/µs	0.3V/µs	0.6V/µs	5V/µs	5V/µs
-3dB Bandwidth	800 kHz	800 kHz	1.5 MHz	500 kHz	500 kHz
Current - Input Bias	17 nA	17 nA	20 nA	-	-
Voltage - Input Offset	25 µV	25 µV	100 µV	350 µV	350 µV
Current - Supply	375µA	375µA	350µA	810µA	810µA
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

Primary Recommendation: AD623ARZ

The AD623ARZ is the direct equivalent replacement for the AD623AR. Both parts maintain identical instrumentation amplifier topology, electrical specifications, and operating parameters. The AD623ARZ is classified as active product status with ROHS3 compliance and unlimited moisture sensitivity rating, providing superior long-term availability and regulatory compliance compared to the obsolete AD623AR. The AD623ARZ is suitable for direct substitution in existing designs without circuit modification.

Secondary Recommendation: AD8226ARZ

The AD8226ARZ is an enhanced instrumentation amplifier alternative offering improved performance characteristics within the same 8-SOIC package. This part provides higher slew rate and bandwidth, extended maximum supply voltage capability (36V), and extended operating temperature range (-40°C to 125°C). The AD8226ARZ is appropriate for applications requiring higher performance specifications or wider operating ranges. Circuit validation is required to confirm compatibility with existing gain and frequency response requirements.

Alternative Consideration: INA149AID / INA149AIDR

The INA149 series represents a cross-topology alternative using differential amplifier architecture rather than instrumentation amplifier topology. These Texas Instruments parts share the 8-SOIC package and surface mount configuration but require minimum supply voltage of 4V (vs. 2.7V for AD623AR). The INA149 series exhibits significantly higher slew rate (5V/µs) and higher input offset voltage (350µV vs. 25µV). Selection of INA149 variants requires circuit redesign and is appropriate only when differential amplifier functionality meets application requirements.

Frequently Asked Questions (FAQ)

Q: Can AD623ARZ be used as a direct replacement for AD623AR?

A: Yes. The AD623ARZ is electrically and functionally identical to the AD623AR across all specified parameters. The primary difference is product status (active vs. obsolete) and packaging format (tube). No circuit modifications are required for substitution.

Q: What are the key differences between AD623ARZ and AD8226ARZ?

A: Both are instrumentation amplifiers in 8-SOIC packages. The AD8226ARZ provides enhanced performance with 0.6V/µs slew rate (vs. 0.3V/µs), 1.5 MHz bandwidth (vs. 800 kHz), and extended supply voltage to 36V (vs. 12V). The AD8226ARZ also operates to 125°C (vs. 85°C). Input offset voltage is higher at 100µV (vs. 25µV). Selection depends on application performance requirements.

Q: Why are INA149 parts listed as substitutes if they are differential amplifiers?

A: The INA149 series shares the same 8-SOIC package and surface mount configuration, enabling physical compatibility. However, the differential amplifier topology differs fundamentally from the instrumentation amplifier topology of the AD623AR. The INA149 series is listed as a functional alternative only for applications where differential amplifier operation is acceptable. Circuit redesign and validation are required.

Q: What is the minimum supply voltage requirement for each substitute?

A: AD623AR and AD623ARZ operate from 2.7V minimum. AD8226ARZ operates from 2.2V minimum. INA149AID and INA149AIDR require 4V minimum supply voltage. Applications operating below 4V cannot use the INA149 series.

Q: Are all substitute parts RoHS compliant?

A: AD623ARZ, AD8226ARZ, INA149AID, and INA149AIDR are all ROHS3 compliant. The original AD623AR does not specify RoHS status.

Q: What is the moisture sensitivity difference between substitute parts?

A: AD623AR and AD623ARZ have MSL 1 (unlimited moisture sensitivity). AD8226ARZ has MSL 1 (unlimited). INA149AID and INA149AIDR have MSL 2 (1 year), requiring controlled storage and handling conditions.

Q: Can AD623ARZ be used in applications requiring operation above 85°C?

A: No. AD623ARZ operates to 85°C maximum. For applications requiring operation to 125°C, use AD8226ARZ or INA149 series alternatives.

Q: What packaging options are available for the AD623 base product?

A: AD623AR packaging is unspecified. AD623ARZ is supplied in tube packaging. Both maintain the 8-SOIC form factor. Verify packaging requirements with procurement specifications.

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