AD8672AR Equivalent & Substitute Parts

Part Overview

The AD8672AR is a general-purpose operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

The AD8672AR operates across a wide supply voltage range of 10V to 36V with a gain bandwidth product of 10 MHz and a slew rate of 4V/µs. With an input bias current of 3 nA and input offset voltage of 20 µV, this general-purpose amplifier is suitable for applications requiring moderate precision and bandwidth. The obsolete status of this component requires engineers to evaluate active alternatives that maintain functional compatibility within system requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	AD8672AR
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	4V/µs
Gain Bandwidth Product	10 MHz
Current - Input Bias	3 nA
Voltage - Input Offset	20 µV
Current - Supply	3mA (x2 Channels)
Current - Output / Channel	20 mA
Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AD8672AR is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure direct PCB footprint compatibility.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 10V to 36V minimum. The gain bandwidth product, slew rate, input bias current, and input offset voltage define the functional performance class. Parts are grouped into two categories:

Direct Functional Equivalents – Parts with matching general-purpose amplifier topology, similar gain bandwidth product (4–10 MHz range), and comparable input characteristics (input bias current in the nanoampere range, input offset voltage under 100 µV).
Functional Alternatives – Parts with different amplifier topologies (J-FET or audio-optimized designs) that provide enhanced performance in specific parameters but may require circuit re-evaluation for offset voltage, input bias current, or bandwidth characteristics.

Dual-Channel Configuration: All substitute parts maintain the 2-circuit configuration required for dual-channel applications.

Temperature Range: Operating temperature range compatibility is evaluated based on application requirements. The AD8672AR supports -40°C to 125°C; substitutes with narrower ranges (0°C to 70°C) are suitable for commercial-grade applications only.

Product Status and Compliance: Active product status is preferred for long-term availability. RoHS3 compliance and REACH unaffected status are standard for modern substitutes.

Parameter Comparison

Parameter	AD8672AR	AD8672ARZ	RC4559DR	RC4559D	LF253DT	LF353DT	TL062CDT	TL062IDT	TL072ACDT	TL072IDT	LM833DT
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	Audio
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Slew Rate (V/µs)	4	4	2	2	16	16	3.5	3.5	16	16	7
Gain Bandwidth Product (MHz)	10	10	4	4	4	4	1	1	4	4	15
Current - Input Bias (nA/pA)	3 nA	3 nA	40 nA	40 nA	20 pA	20 pA	30 pA	30 pA	20 pA	20 pA	300 nA
Voltage - Input Offset (µV/mV)	20 µV	20 µV	2 mV	2 mV	3 mV	3 mV	3 mV	3 mV	3 mV	3 mV	300 µV
Current - Supply (mA)	3 (x2)	3 (x2)	3.3 (x2)	3.3 (x2)	1.4 (x2)	1.4 (x2)	0.2 (x2)	0.2 (x2)	1.4	1.4	4
Current - Output / Channel (mA)	20	20	10	10	40	40	20	20	40	40	37
Voltage - Supply Span (Min)	10 V	10 V	10 V	10 V	6 V	6 V	6 V	6 V	6 V	6 V	5 V
Voltage - Supply Span (Max)	36 V	36 V	30 V	30 V	36 V	36 V	36 V	36 V	36 V	36 V	30 V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 105°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 105°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 105°C
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: AD8672ARZ

The AD8672ARZ is the direct equivalent of the AD8672AR, manufactured by Analog Devices Inc. with identical electrical specifications. This part is active in production status with ROHS3 compliance and REACH unaffected designation. The only difference is packaging format (Tube versus unspecified for the original). This is the recommended substitute for direct replacement in new designs and production continuity.

Secondary Substitutes for General-Purpose Applications: RC4559DR and RC4559D

The RC4559DR (Tape & Reel, Active status) and RC4559D (Tube, Last Time Buy status) are general-purpose amplifiers from Texas Instruments with 8-SOIC packaging. These parts operate within the 10V to 30V supply range and maintain dual-channel configuration. The RC4559DR is preferred due to active product status. However, these parts exhibit lower gain bandwidth product (4 MHz versus 10 MHz) and higher input bias current (40 nA versus 3 nA), making them suitable only for applications where these performance differences are acceptable.

J-FET Alternatives for Low Input Bias Current Applications: LF253DT, LF353DT, TL072ACDT, TL072IDT

These J-FET amplifiers provide significantly lower input bias current (20 pA) compared to the AD8672AR (3 nA), making them suitable for high-impedance input applications. The LF253DT and TL072 variants offer higher slew rate (16V/µs) and output current capability (40 mA). Temperature range considerations apply: LF353DT and TL072ACDT are limited to 0°C to 70°C, while TL062IDT and TL072IDT support extended temperature ranges (-40°C to 105°C and -40°C to 125°C respectively). All J-FET alternatives are active products with full compliance certifications.

Low-Power Alternative: TL062CDT and TL062IDT

The TL062 series offers extremely low supply current (200 µA per channel) with J-FET input characteristics. These parts are suitable for battery-powered or power-constrained applications. The TL062IDT supports the full -40°C to 105°C temperature range, while TL062CDT is limited to 0°C to 70°C. The trade-off is lower gain bandwidth product (1 MHz) and slew rate (3.5V/µs).

Audio-Optimized Alternative: LM833DT

The LM833DT is an audio-grade amplifier with 15 MHz gain bandwidth product and 7V/µs slew rate, optimized for audio frequency applications. This part operates across 5V to 30V supply range and is active in production with full compliance. Higher input offset voltage (300 µV) and input bias current (300 nA) make this suitable for audio applications where these specifications are acceptable.

Frequently Asked Questions (FAQ)

Q: Can I directly replace AD8672AR with AD8672ARZ?

A: Yes. The AD8672ARZ is the direct functional equivalent with identical electrical specifications. The difference is packaging format (Tube). Both parts are 8-SOIC surface mount devices with matching pin configurations, electrical performance, and operating ranges. AD8672ARZ is active in production and is the recommended replacement.

Q: What is the key difference between the AD8672AR and the RC4559DR?

A: Both are general-purpose dual-channel amplifiers in 8-SOIC packages. The AD8672AR has 10 MHz gain bandwidth product and 3 nA input bias current, while the RC4559DR has 4 MHz gain bandwidth product and 40 nA input bias current. The RC4559DR also has lower maximum supply voltage (30V versus 36V). The RC4559DR is suitable only if your application can tolerate lower bandwidth and higher input bias current.

Q: Why would I choose a J-FET amplifier like the LF253DT over the AD8672AR?

A: J-FET amplifiers provide input bias current in the picoampere range (20 pA) compared to the AD8672AR's 3 nanoamperes. This is critical for high-impedance input circuits where input bias current causes unacceptable signal errors. The trade-off is higher input offset voltage (3 mV versus 20 µV) and lower gain bandwidth product (4 MHz versus 10 MHz).

Q: Is the TL062CDT suitable for my application requiring -40°C to 125°C operation?

A: No. The TL062CDT operates only from 0°C to 70°C. For extended temperature range applications, use TL062IDT (-40°C to 105°C) or TL072IDT (-40°C to 125°C). Both maintain the same electrical specifications as TL062CDT within their respective temperature ranges.

Q: What does "Last Time Buy" status mean for the RC4559D?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but no new production is planned. For new designs, use the active equivalent RC4559DR or select an alternative part with active production status.

Q: Can I use the LM833DT in a precision instrumentation circuit?

A: The LM833DT is optimized for audio applications and has higher input offset voltage (300 µV) and input bias current (300 nA) compared to the AD8672AR (20 µV and 3 nA respectively). For precision instrumentation requiring low offset voltage and bias current, use AD8672ARZ, LF253DT, or TL072IDT instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant and REACH unaffected. The original AD8672AR does not specify RoHS status. For new designs subject to RoHS requirements, use AD8672ARZ or any of the active substitute parts.

Q: What is the difference between TL072ACDT and TL072IDT?

A: Both are J-FET amplifiers with identical electrical specifications (16V/µs slew rate, 4 MHz gain bandwidth product, 20 pA input bias current). The TL072ACDT is automotive-grade (AEC-Q100 qualified) with 0°C to 70°C operating range. The TL072IDT supports -40°C to 125°C and is general-purpose grade. Select TL072ACDT for automotive applications; use TL072IDT for extended temperature range or non-automotive applications.

Q: Does package format (Tube, Tape & Reel, Cut Tape) affect electrical performance?

A: No. Package format affects only handling, storage, and assembly processes. Electrical specifications and performance are identical regardless of packaging format. Select based on your manufacturing process requirements (manual assembly typically uses Tube; automated assembly uses Tape & Reel or Cut Tape).

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