AD8671AR Equivalent & Substitute Parts

Part Overview

The AD8671AR is a general-purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The AD8671AR delivers a 10 MHz gain bandwidth product with a 4 V/µs slew rate, suitable for general-purpose amplification applications requiring moderate bandwidth and speed characteristics.

Substiute Parts

AD8671AR

Analog Devices Inc.In Stock: 3837AD8671AR Datasheet

Current PartRFQ

AD8671ARZ

Analog Devices Inc.In Stock: 4112AD8671ARZ Datasheet

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THS4601IDDA

Texas InstrumentsIn Stock: 1765THS4601IDDA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD8671AR is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Amplifier type classification (General Purpose)
• Number of circuits (1 circuit)
• Supply voltage range compatibility (minimum 10 V, maximum 36 V or higher)
• Output current capability (minimum 20 mA per channel)
• Operating temperature range coverage (-40°C to 125°C or equivalent)

Mechanical Compatibility Criteria:

• Surface mount mounting type
• 8-pin package configuration
• 3.90 mm package width tolerance

Substitute Categories:

Direct Equivalent: AD8671ARZ maintains identical electrical specifications and base product lineage while differing only in packaging format (Tube vs. unspecified) and product status (Active vs. Obsolete).

Similar Substitute: THS4601IDDA provides functional substitution with enhanced performance characteristics. While maintaining general-purpose amplifier classification, single-circuit configuration, and compatible supply voltage range, this device exhibits superior slew rate (100 V/µs vs. 4 V/µs), higher gain bandwidth product (180 MHz vs. 10 MHz), and increased output current capability (80 mA vs. 20 mA). The THS4601IDDA operates within a reduced maximum supply voltage (30 V vs. 36 V) and narrower temperature range (-40°C to 85°C vs. -40°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Specification-Matched):

The AD8671ARZ is the primary equivalent for the obsolete AD8671AR. Both devices share identical electrical specifications, single-circuit configuration, and 8-SOIC package geometry. The AD8671ARZ carries Active product status and holds ROHS3 compliance and REACH Unaffected certification, supporting modern supply chain and regulatory requirements. Selection of AD8671ARZ is appropriate when original performance characteristics and electrical behavior must be preserved without modification to circuit design.

For Performance-Enhanced Substitution (Design Modification Acceptable):

The THS4601IDDA from Texas Instruments provides functional substitution with significantly enhanced performance metrics. This device delivers 25 times higher slew rate (100 V/µs vs. 4 V/µs), 18 times higher gain bandwidth product (180 MHz vs. 10 MHz), and 4 times greater output current capability (80 mA vs. 20 mA). The THS4601IDDA maintains compatibility with the 10 V minimum supply voltage and operates within the -40°C to 85°C temperature range, covering the lower portion of the original operating window. The maximum supply voltage specification is reduced to 30 V, requiring verification against circuit design requirements. Selection of THS4601IDDA is appropriate for applications where enhanced bandwidth, slew rate, and output drive capability provide functional advantages and where the reduced maximum supply voltage and narrower temperature range are acceptable.

Both substitute options maintain surface mount configuration and MSL Level 1 moisture sensitivity classification, supporting standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can AD8671ARZ be used as a direct replacement for AD8671AR without circuit modification?

A: Yes. The AD8671ARZ maintains identical electrical specifications, single-circuit configuration, and 8-SOIC package footprint. No circuit modification is required for direct substitution. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube).

Q: What are the key differences between AD8671ARZ and THS4601IDDA?

A: Both devices are general-purpose single-circuit operational amplifiers in 8-pin surface mount packages. The THS4601IDDA provides enhanced performance with 25 times higher slew rate, 18 times higher gain bandwidth product, and 4 times greater output current capability. The THS4601IDDA operates at a reduced maximum supply voltage (30 V vs. 36 V) and narrower temperature range (-40°C to 85°C vs. -40°C to 125°C).

Q: Is the THS4601IDDA package physically compatible with the AD8671AR footprint?

A: The THS4601IDDA uses an 8-PowerSOIC package while the AD8671AR uses a standard 8-SOIC package. Both maintain 0.154" (3.90 mm) width and 8-pin configuration. The PowerSOIC variant includes an exposed thermal pad for enhanced heat dissipation. PCB layout verification is required to confirm footprint compatibility, as the thermal pad may require design accommodation.

Q: What compliance certifications apply to substitute parts?

A: The AD8671ARZ holds ROHS3 compliance and REACH Unaffected certification. The THS4601IDDA also holds ROHS3 compliance and REACH Unaffected certification. Both devices carry MSL Level 1 (Unlimited) moisture sensitivity classification.

Q: Can THS4601IDDA be used in applications requiring the full -40°C to 125°C temperature range?

A: No. The THS4601IDDA operates within -40°C to 85°C. Applications requiring operation above 85°C must use AD8671ARZ or verify that the reduced temperature range is acceptable for the specific application environment.

Q: What is the maximum supply voltage for each substitute option?

A: The AD8671ARZ supports 36 V maximum supply voltage, matching the original AD8671AR specification. The THS4601IDDA supports 30 V maximum supply voltage. Circuit designs operating above 30 V require AD8671ARZ or the original AD8671AR.

Q: Are there input bias current differences between the substitutes?

A: Yes. The AD8671ARZ maintains 3 nA input bias current matching the original AD8671AR. The THS4601IDDA specifies 30 pA input bias current, representing 100 times lower bias current. Applications sensitive to input bias current effects may require circuit analysis when substituting with THS4601IDDA.

Q: What is the input offset voltage specification for THS4601IDDA?

A: The THS4601IDDA specifies 1 mV (1000 µV) input offset voltage compared to 20 µV for AD8671AR and AD8671ARZ. Applications requiring low offset voltage may require additional offset trimming or selection of AD8671ARZ.