AD825AR Equivalent & Substitute Parts

Part Overview

The AD825AR is a J-FET input operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. The AD825AR delivers high input impedance and low input bias current characteristics suitable for precision signal conditioning applications. Due to its obsolete status, identification of equivalent and substitute components is necessary for design continuity and procurement planning.

Substiute Parts

AD825AR

Analog Devices Inc.In Stock: 1956AD825AR Datasheet

Current PartRFQ

AD825ARZ

Analog Devices Inc.In Stock: 3588AD825ARZ Datasheet

DirectRFQ

THS4601IDDA

Texas InstrumentsIn Stock: 1765THS4601IDDA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the AD825AR are identified based on electrical and mechanical compatibility within the operational amplifier category. Substitution eligibility is determined by the following criteria:

Direct Equivalency Criteria:

• Identical amplifier topology (J-FET input architecture)
• Matching single-circuit configuration
• Compatible 8-SOIC surface mount package footprint
• Overlapping or superior electrical performance specifications
• Identical or compatible supply voltage range (10V to 36V minimum)
• Operating temperature range encompassing -40°C to 85°C

Substitute Classification:

Direct Substitute (Packaging Variant): AD825ARZ represents a direct equivalent with identical electrical specifications and J-FET topology, differentiated only by packaging format (Tube versus unspecified original packaging). This component maintains full pin-for-pin compatibility and electrical performance parity.

Similar Substitute (Performance Alternative): THS4601IDDA is classified as a similar substitute based on general-purpose amplifier architecture with compatible package footprint and supply voltage range. This component exhibits different amplifier topology (General Purpose versus J-FET) and enhanced bandwidth characteristics, requiring application-level evaluation for suitability.

Parameter Comparison

Engineering Selection Recommendations

AD825ARZ Selection Rationale:

The AD825ARZ is the primary substitute for the AD825AR. Both components share identical electrical specifications, J-FET input architecture, and 8-SOIC package footprint. The AD825ARZ maintains active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory alignment. This component is suitable for direct replacement in existing AD825AR designs without circuit modification. The AD825ARZ is available in Tube packaging format with 3543 units in current inventory.

THS4601IDDA Selection Rationale:

The THS4601IDDA is classified as a similar substitute for applications where enhanced bandwidth performance is acceptable. This Texas Instruments component operates within the same supply voltage range (10V to 30V) and maintains compatible 8-PowerSOIC package footprint. The THS4601IDDA exhibits higher gain bandwidth product (180 MHz versus 26 MHz) and -3dB bandwidth (440 MHz versus 46 MHz), resulting in improved frequency response characteristics. However, the THS4601IDDA employs general-purpose amplifier topology rather than J-FET input architecture, producing higher input bias current (30 pA versus 15 pA). The maximum supply voltage is reduced to 30V compared to the AD825AR specification of 36V. The THS4601IDDA is suitable for applications where J-FET input characteristics are not critical and enhanced bandwidth is beneficial. This component maintains active product status with ROHS3 compliance and REACH unaffected certification.

Frequently Asked Questions (FAQ)

Q: Can AD825ARZ be used as a direct replacement for AD825AR?

A: Yes. The AD825ARZ is electrically and mechanically identical to the AD825AR. Both components feature J-FET input architecture, identical electrical specifications, and compatible 8-SOIC package footprint. The primary difference is packaging format and product status. The AD825ARZ is currently in active production with improved availability.

Q: What are the key differences between AD825ARZ and THS4601IDDA?

A: The AD825ARZ maintains J-FET input topology with 26 MHz gain bandwidth product and 15 pA input bias current. The THS4601IDDA employs general-purpose amplifier topology with 180 MHz gain bandwidth product and 30 pA input bias current. The THS4601IDDA provides enhanced bandwidth performance but operates with a reduced maximum supply voltage of 30V compared to 36V for the AD825ARZ. Input impedance characteristics differ between the two architectures.

Q: Is the 8-PowerSOIC package of THS4601IDDA compatible with 8-SOIC PCB layouts?

A: The 8-PowerSOIC and 8-SOIC packages share identical 0.154" (3.90mm) width dimensions and surface mount footprint compatibility. However, the PowerSOIC variant includes an additional thermal pad for enhanced heat dissipation. PCB layout verification is necessary to confirm pad compatibility and thermal management requirements for the specific application.

Q: What is the significance of the obsolete status for AD825AR?

A: Obsolete status indicates that Analog Devices Inc. has discontinued production of the AD825AR. This classification necessitates identification of substitute components for new designs and ongoing production requirements. The AD825ARZ provides an active-status alternative with identical specifications and improved long-term availability.

Q: Are AD825ARZ and THS4601IDDA both RoHS3 compliant?

A: Yes. Both the AD825ARZ and THS4601IDDA are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What supply voltage range must be considered when selecting between these substitutes?

A: The AD825AR and AD825ARZ support supply voltages from 10V to 36V. The THS4601IDDA operates within a reduced range of 10V to 30V. Applications requiring supply voltages between 30V and 36V must utilize the AD825ARZ or AD825AR to maintain specification compliance.

Q: How do input bias current specifications affect circuit design?

A: The AD825AR and AD825ARZ specify 15 pA input bias current, characteristic of J-FET input amplifiers. The THS4601IDDA specifies 30 pA input bias current. Applications requiring ultra-low input bias current for high-impedance signal sources should prioritize the J-FET input variants (AD825AR or AD825ARZ) to minimize input current errors and maintain signal integrity.