AD8221ARM Equivalent & Substitute Parts

Part Overview

The AD8221ARM is an instrumentation amplifier integrated circuit manufactured by Analog Devices Inc., housed in an 8-MSOP surface mount package. This device features a single amplifier circuit with a slew rate of 2V/µs, -3dB bandwidth of 825 kHz, and operates across a supply voltage range of 4.6V to 36V. The AD8221ARM is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Amplifier Type	Instrumentation
Number of Circuits	1
Slew Rate	2V/µs
-3dB Bandwidth	825 kHz
Current - Input Bias	500 pA
Voltage - Input Offset	60 µV
Current - Supply	900µA
Current - Output / Channel	18 mA
Voltage - Supply Span (Min)	4.6 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AD8221ARM is determined by electrical and mechanical compatibility across the following critical parameters: amplifier type, number of circuits, package form factor, mounting type, supply voltage range, and operating temperature range. The substitute parts are grouped into two categories based on functional equivalence:

Direct Equivalent: AD8221ARMZ maintains identical electrical specifications to the AD8221ARM, including slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and supply voltage range. This part differs only in packaging format (Tube versus unspecified) and product status (Active versus Obsolete), making it a direct functional replacement.

Similar Equivalents: AD8421ARMZ, AD8422ARMZ, and ADA4622-2ARMZ are similar instrumentation or amplifier devices within the same 8-MSOP package family. These parts share the same physical package dimensions and mounting type but exhibit variations in performance characteristics such as slew rate, bandwidth, input bias current, supply current, and output current capabilities. Selection among these alternatives depends on specific application requirements for performance parameters.

Parameter Comparison

Parameter	AD8221ARM	AD8221ARMZ	AD8421ARMZ	AD8422ARMZ	ADA4622-2ARMZ
Amplifier Type	Instrumentation	Instrumentation	Instrumentation	Instrumentation	J-FET
Number of Circuits	1	1	1	1	2
Slew Rate	2V/µs	2V/µs	35V/µs	0.8V/µs	23V/µs
-3dB Bandwidth	825 kHz	825 kHz	10 MHz	2.2 MHz	15.5 MHz
Current - Input Bias	500 pA	500 pA	1 nA	500 pA	2 pA
Voltage - Input Offset	60 µV	60 µV	60 µV	70 µV	40 µV
Current - Supply	900µA	900µA	2mA	300µA	665µA (x2 Channels)
Current - Output / Channel	18 mA	18 mA	65 mA	20 mA	20 mA
Voltage - Supply Span (Min)	4.6 V	4.6 V	5 V	4.6 V	5 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	30 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Mounting Type	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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	Not Specified	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

AD8221ARMZ is the primary substitute for the AD8221ARM. This part maintains complete electrical and functional equivalence with identical specifications across all measured parameters. The AD8221ARMZ is classified as Active product status, ensuring ongoing availability and manufacturing support. The part is ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component procurement.

AD8422ARMZ serves as an alternative for applications where reduced supply current consumption is prioritized. This instrumentation amplifier operates at 300µA supply current compared to the 900µA of the AD8221ARM, representing a 67% reduction in power consumption. The AD8422ARMZ features rail-to-rail output capability and operates within the same supply voltage range (4.6V to 36V) and temperature range (-40°C to 85°C). Trade-offs include lower slew rate (0.8V/µs versus 2V/µs) and reduced bandwidth (2.2 MHz versus 825 kHz).

AD8421ARMZ is suitable for high-speed applications requiring increased slew rate and bandwidth performance. This part delivers 35V/µs slew rate and 10 MHz bandwidth, substantially exceeding the AD8221ARM specifications. The AD8421ARMZ accommodates higher output current (65 mA versus 18 mA) and operates within the same temperature range. The minimum supply voltage requirement increases to 5V, and supply current increases to 2mA.

ADA4622-2ARMZ represents a different amplifier topology (J-FET) with dual-circuit configuration. This part is not a direct functional equivalent but offers superior input bias current performance (2 pA versus 500 pA) and extended operating temperature range (-40°C to 125°C). The ADA4622-2ARMZ maximum supply voltage is limited to 30V, which may restrict use in applications requiring the full 36V capability of the AD8221ARM.

Frequently Asked Questions (FAQ)

Q: Can AD8221ARMZ be used as a direct replacement for AD8221ARM?

A: Yes. The AD8221ARMZ is electrically and functionally identical to the AD8221ARM across all specified parameters. Both parts are instrumentation amplifiers with single circuits in 8-MSOP packages, identical slew rates, bandwidth, bias currents, offset voltages, supply currents, output currents, and operating temperature ranges. The primary difference is product status: AD8221ARMZ is Active while AD8221ARM is Obsolete.

Q: What are the key differences between AD8221ARMZ and AD8421ARMZ?

A: The AD8421ARMZ provides significantly higher performance in slew rate (35V/µs versus 2V/µs) and bandwidth (10 MHz versus 825 kHz). The AD8421ARMZ also delivers higher output current capability (65 mA versus 18 mA) and operates at higher supply current (2mA versus 900µA). The minimum supply voltage requirement increases from 4.6V to 5V. These differences make AD8421ARMZ suitable for high-speed signal processing applications.

Q: When should AD8422ARMZ be selected over AD8221ARMZ?

A: AD8422ARMZ is selected when power consumption reduction is a design requirement. This part operates at 300µA supply current, consuming 67% less power than AD8221ARMZ. The AD8422ARMZ features rail-to-rail output capability and maintains the same supply voltage range and operating temperature. Applications with strict power budgets or battery-powered systems benefit from this selection. The trade-off is reduced slew rate and bandwidth performance.

Q: Is ADA4622-2ARMZ compatible with AD8221ARM applications?

A: ADA4622-2ARMZ is not a direct functional equivalent. This part uses J-FET amplifier topology with dual circuits, whereas AD8221ARM is a single-circuit instrumentation amplifier. The ADA4622-2ARMZ offers superior input bias current (2 pA) and extended temperature range (-40°C to 125°C) but is limited to 30V maximum supply voltage. Applications requiring the full 36V supply capability of AD8221ARM cannot use ADA4622-2ARMZ.

Q: Are all substitute parts available in the same 8-MSOP package?

A: Yes. All substitute parts (AD8221ARMZ, AD8421ARMZ, AD8422ARMZ, and ADA4622-2ARMZ) are housed in 8-TSSOP and 8-MSOP packages with identical physical dimensions (0.118", 3.00mm Width). All parts are surface mount devices with identical mounting type and footprint compatibility.

Q: What compliance certifications apply to the substitute parts?

A: All substitute parts are ROHS3 Compliant and REACH Unaffected. These certifications ensure compliance with current environmental and hazardous substance regulations for electronic component procurement and use in regulated markets.

Q: What is the inventory status of substitute parts?

A: AD8221ARMZ has 3411 pieces in stock, AD8421ARMZ has 1280 pieces, AD8422ARMZ has 1593 pieces, and ADA4622-2ARMZ has 2252 pieces available as new original components.

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