AD797AR Equivalent & Substitute Parts

Part Overview

The AD797AR 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, indicating that direct procurement from primary sources may be limited. The AD797AR delivers high-speed amplification with a gain-bandwidth product of 110 MHz and a slew rate of 20V/µs, suitable for applications requiring fast signal processing and low input offset voltage characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Substitute parts must maintain electrical compatibility across critical parameters including bandwidth, slew rate, supply voltage range, and thermal operating conditions.

Substiute Parts

AD797AR

Analog Devices Inc.In Stock: 14706AD797AR Datasheet

Current PartRFQ

AD797ARZ

Analog Devices Inc.In Stock: 15615AD797ARZ Datasheet

DirectRFQ

LT1028CS8#PBF

Analog Devices Inc.In Stock: 5990LT1028CS8#PBF Datasheet

SimilarRFQ

LT1028CS8#TRPBF

Analog Devices Inc.In Stock: 89067LT1028CS8#TRPBF Datasheet

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AD797BRZ

Analog Devices Inc.In Stock: 3439AD797BRZ Datasheet

Parametric EquivalentRFQ

OPA244UA/2K5

Texas InstrumentsIn Stock: 5218OPA244UA/2K5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AD797AR are classified into three categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical Performance): Parts that maintain all critical electrical parameters including slew rate, gain-bandwidth product, input bias current, input offset voltage, supply current, output current capability, and supply voltage range. These parts are pin-compatible and functionally interchangeable within the same package footprint.

Parametric Equivalents (Minor Parameter Variations): Parts that share the same package, pinout, and base electrical architecture but exhibit minor variations in specific parameters such as input offset voltage. These parts are suitable for applications where the parameter variation does not impact circuit performance.

Similar Alternatives (Reduced Performance Specifications): Parts that operate within the same functional category and package but have reduced bandwidth, slew rate, or other performance metrics. These parts require circuit-level evaluation to confirm suitability for the intended application.

Key Parameters Determining Substitution Eligibility:

• Slew Rate (20V/µs minimum for direct substitutes)
• Gain Bandwidth Product (110 MHz minimum for direct substitutes)
• Supply Voltage Range (10V to 30V minimum for direct substitutes)
• Operating Temperature Range (-40°C to 85°C minimum for direct substitutes)
• Package / Case (8-SOIC footprint required)
• Input Bias Current and Input Offset Voltage (within specified tolerances)

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (Recommended Primary Choice):

The AD797ARZ is the optimal direct substitute for the AD797AR. Both parts are manufactured by Analog Devices Inc. and maintain identical electrical specifications across all critical parameters: 20V/µs slew rate, 110 MHz gain-bandwidth product, 250 nA input bias current, 25 µV input offset voltage, 8.2 mA supply current, 50 mA output current, and -40°C to 85°C operating temperature range. The AD797ARZ is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The primary difference is packaging format: AD797ARZ is supplied in Tube packaging, whereas the original AD797AR packaging is not specified. This part provides full electrical and functional compatibility with no circuit redesign required.

For Parametric Equivalence (Secondary Choice):

The AD797BRZ is a parametric equivalent manufactured by Analog Devices Inc. with identical electrical performance to the AD797AR except for input offset voltage, which is specified at 10 µV compared to 25 µV. This represents an improvement in precision. All other parameters—slew rate, gain-bandwidth product, supply voltage range, operating temperature range, and output current capability—are identical. The AD797BRZ is in active production status with ROHS3 compliance. This part is suitable for applications where lower input offset voltage provides additional performance margin.

For Reduced-Performance Applications:

The LT1028CS8#PBF and LT1028CS8#TRPBF are similar alternatives manufactured by Analog Devices Inc. These parts exhibit reduced slew rate (15V/µs versus 20V/µs) and lower gain-bandwidth product (75 MHz versus 110 MHz). However, they offer superior input bias current (30 nA versus 250 nA) and lower input offset voltage (20 µV versus 25 µV). The operating temperature range is restricted to 0°C to 70°C, which is narrower than the AD797AR specification. These parts are suitable only for applications where bandwidth and slew rate requirements are less stringent than the original design specification. Both LT1028 variants are in active production status with ROHS3 compliance.

Not Recommended for Direct Substitution:

The OPA244UA/2K5 manufactured by Texas Instruments is not suitable as a substitute for the AD797AR. Although both parts share the same 8-SOIC package and -40°C to 85°C operating temperature range, the OPA244UA/2K5 exhibits significantly reduced performance specifications: slew rate of 0.16V/µs (versus 20V/µs), gain-bandwidth product of 430 kHz (versus 110 MHz), and supply current of 50 µA (versus 8.2 mA). The input offset voltage is substantially higher at 700 µV. This part is designed for ultra-low-power applications and is not electrically compatible with circuits designed for the AD797AR. The OPA244UA/2K5 has a higher moisture sensitivity level (MSL 3) compared to the AD797AR (MSL 1).

Compliance and Availability Considerations:

All active substitute parts (AD797ARZ, AD797BRZ, LT1028CS8#PBF, LT1028CS8#TRPBF) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The AD797ARZ and AD797BRZ maintain unlimited moisture sensitivity rating (MSL 1), identical to the original AD797AR, reducing handling and storage complexity. Inventory availability is confirmed for all recommended substitutes, with AD797ARZ showing 15,535 units and AD797BRZ showing 3,339 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the AD797ARZ be used as a direct replacement for the AD797AR without circuit modification?

A: Yes. The AD797ARZ is a direct electrical and functional equivalent. All critical parameters—slew rate, gain-bandwidth product, input bias current, input offset voltage, supply voltage range, and operating temperature range—are identical. The 8-SOIC package footprint is the same, enabling direct PCB substitution. The primary difference is packaging format (Tube versus unspecified original packaging), which does not affect circuit performance.

Q: What is the difference between AD797ARZ and AD797BRZ?

A: Both parts are manufactured by Analog Devices Inc. and share identical electrical specifications except for input offset voltage. The AD797BRZ specifies 10 µV input offset voltage compared to 25 µV for the AD797ARZ. This represents improved precision in the AD797BRZ. All other parameters—slew rate (20V/µs), gain-bandwidth product (110 MHz), supply voltage range (10V to 30V), operating temperature range (-40°C to 85°C), and output current (50 mA)—are identical. Selection between these parts depends on whether the lower input offset voltage of the AD797BRZ provides additional performance margin for the application.

Q: Why are the LT1028 variants listed as similar alternatives rather than direct substitutes?

A: The LT1028CS8#PBF and LT1028CS8#TRPBF exhibit reduced performance specifications in two critical parameters: slew rate is 15V/µs (versus 20V/µs for the AD797AR) and gain-bandwidth product is 75 MHz (versus 110 MHz). Additionally, the operating temperature range is restricted to 0°C to 70°C, which does not meet the -40°C to 85°C specification of the AD797AR. These parts are suitable only for applications where bandwidth and slew rate requirements are less demanding than the original design. Circuit-level evaluation is required to confirm compatibility.

Q: Is the OPA244UA/2K5 a suitable substitute for the AD797AR?

A: No. The OPA244UA/2K5 is not suitable for direct substitution. Although both parts share the same 8-SOIC package and -40°C to 85°C operating temperature range, the OPA244UA/2K5 is designed for ultra-low-power applications and exhibits significantly reduced performance: slew rate of 0.16V/µs (versus 20V/µs), gain-bandwidth product of 430 kHz (versus 110 MHz), and input offset voltage of 700 µV (versus 25 µV). This part is electrically incompatible with circuits designed for the AD797AR.

Q: What packaging formats are available for substitute parts?

A: The AD797ARZ is supplied in Tube packaging. The LT1028CS8#PBF is supplied in Tube packaging, while the LT1028CS8#TRPBF is supplied in Tape & Reel (TR) format. The OPA244UA/2K5 is supplied in Tape & Reel (TR) format. All parts are housed in the 8-SOIC (0.154", 3.90mm Width) surface-mount package, which is compatible with standard PCB assembly equipment and footprints.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (AD797ARZ, AD797BRZ, LT1028CS8#PBF, LT1028CS8#TRPBF, and OPA244UA/2K5) are ROHS3 compliant. The original AD797AR does not specify RoHS status due to its obsolete classification. All substitute parts are also REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: The AD797ARZ, AD797BRZ, LT1028CS8#PBF, and LT1028CS8#TRPBF all have MSL 1 (Unlimited), identical to the AD797AR. This indicates minimal moisture sensitivity and simplified handling and storage requirements. The OPA244UA/2K5 has MSL 3 (168 Hours), which requires more stringent moisture control during storage and assembly.

Q: Can I use the LT1028 variants in a design originally specified for the AD797AR?

A: The LT1028 variants can be used only if the application requirements are less stringent than the original AD797AR specification. Specifically, if your circuit can tolerate reduced slew rate (15V/µs instead of 20V/µs), lower gain-bandwidth product (75 MHz instead of 110 MHz), and narrower operating temperature range (0°C to 70°C instead of -40°C to 85°C), then the LT1028 variants are suitable. However, if the original design relies on the full performance specifications of the AD797AR, the LT1028 variants will not provide equivalent functionality. Circuit-level analysis is required to determine compatibility.

Q: What is the current availability status for substitute parts?

A: All substitute parts are currently in active production and available in stock. The AD797ARZ has 15,535 units available, the AD797BRZ has 3,339 units available, the LT1028CS8#PBF has 5,923 units available, the LT1028CS8#TRPBF has 88,988 units available, and the OPA244UA/2K5 has 5,200 units available. Inventory levels are subject to change based on market demand and supply conditions.