AD797BR Equivalent & Substitute Parts

Part Overview

The AD797BR 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, though 1920 pieces remain in stock as new original inventory. The AD797BR delivers high-speed amplification with a gain bandwidth product of 110 MHz and slew rate of 20V/µs, suitable for precision signal conditioning and high-frequency applications requiring low input offset voltage and low input bias current.

Due to its obsolete product status, equivalent and substitute parts are necessary for new designs, long-term production continuity, and procurement flexibility. Active alternatives with comparable or enhanced electrical characteristics are available from the same manufacturer.

Substiute Parts

AD797BR

Analog Devices Inc.In Stock: 1954AD797BR Datasheet

Current PartRFQ

AD797BRZ

Analog Devices Inc.In Stock: 3439AD797BRZ Datasheet

DirectRFQ

LT1028CS8#PBF

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

SimilarRFQ

LT1028CS8#TRPBF

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

SimilarRFQ

AD797ARZ

Analog Devices Inc.In Stock: 15615AD797ARZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD797BR is determined by electrical parameter compatibility and physical package compatibility. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Slew Rate: ≥ 20V/µs
• Gain Bandwidth Product: ≥ 110 MHz
• Current - Input Bias: ≤ 250 nA
• Voltage - Input Offset: ≤ 10 µV
• Current - Supply: ≤ 8.2 mA
• Current - Output / Channel: ≥ 50 mA
• Voltage - Supply Span: 10V to 30V minimum coverage
• Operating Temperature: -40°C to 85°C minimum coverage

Direct Equivalent: AD797BRZ meets all electrical and mechanical parameters identically to the main part, with the distinction of active product status and tube packaging.

Parametric Equivalent: AD797ARZ maintains identical electrical performance with one exception: Voltage - Input Offset is 25 µV (versus 10 µV for AD797BR). This represents a relaxed specification within the same device family and active product status.

Similar Alternatives: LT1028CS8#PBF and LT1028CS8#TRPBF are general-purpose amplifiers in compatible 8-SOIC packages but with reduced electrical performance specifications (Slew Rate: 15V/µs, Gain Bandwidth Product: 75 MHz, Input Bias Current: 30 nA, Input Offset Voltage: 20 µV). These parts operate within a wider supply voltage range (8V to 36V) but narrower temperature range (0°C to 70°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Electrically Identical):

The AD797BRZ is the primary direct substitute for the AD797BR. Both devices share identical electrical specifications and 8-SOIC package geometry. The AD797BRZ carries active product status and is ROHS3 compliant with REACH unaffected certification, making it suitable for new designs and long-term production. The AD797BRZ is available in tube packaging with 3339 pieces in stock.

For Parametric Equivalence (Same Family, Minor Specification Variance):

The AD797ARZ provides parametric equivalence with a single specification difference: input offset voltage of 25 µV versus 10 µV on the main part. This relaxed specification remains within the same AD797 device family and maintains all other electrical and thermal characteristics. The AD797ARZ is active, ROHS3 compliant, and REACH unaffected, with 15535 pieces available in tube packaging. Selection of AD797ARZ is appropriate when the 25 µV input offset voltage specification is acceptable for the application.

For Performance Trade-Off Applications (Reduced Bandwidth, Lower Bias Current):

The LT1028CS8#PBF and LT1028CS8#TRPBF are similar general-purpose amplifiers with reduced electrical performance but enhanced supply voltage range and lower input bias current. These parts operate at 15V/µs slew rate and 75 MHz gain bandwidth product, representing a 25% reduction in both parameters. Input bias current is reduced to 30 nA (versus 250 nA), and input offset voltage is 20 µV. Operating temperature range is narrower (0°C to 70°C). These alternatives are suitable only when the reduced bandwidth and slew rate specifications are compatible with application requirements. LT1028CS8#PBF is available in tube packaging (5923 pieces), and LT1028CS8#TRPBF is available in tape and reel packaging (88988 pieces).

Compliance and Regulatory Considerations:

All active substitute parts (AD797BRZ, AD797ARZ, LT1028CS8#PBF, LT1028CS8#TRPBF) are ROHS3 compliant and REACH unaffected. All parts carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can AD797BRZ be used as a direct replacement for AD797BR in existing designs?

A: Yes. The AD797BRZ is electrically and mechanically identical to the AD797BR. Both devices feature identical slew rate (20V/µs), gain bandwidth product (110 MHz), input offset voltage (10 µV), input bias current (250 nA), and supply current (8.2 mA). Both use the 8-SOIC package with 0.154" width. The primary difference is product status: AD797BRZ is active while AD797BR is obsolete. Pin configuration and electrical performance are fully compatible.

Q: What is the difference between AD797ARZ and AD797BR?

A: The AD797ARZ differs from AD797BR in one electrical parameter: input offset voltage. AD797ARZ specifies 25 µV maximum input offset voltage, while AD797BR specifies 10 µV. All other parameters—slew rate, gain bandwidth product, input bias current, supply current, output current, supply voltage range, and operating temperature—are identical. Both use the 8-SOIC package. The AD797ARZ is active and ROHS3 compliant, making it suitable for new designs when the relaxed input offset voltage specification is acceptable.

Q: Why do LT1028CS8#PBF and LT1028CS8#TRPBF have lower bandwidth than AD797BR?

A: The LT1028 series represents a different device family with different design priorities. LT1028CS8 devices operate at 15V/µs slew rate and 75 MHz gain bandwidth product, compared to 20V/µs and 110 MHz for AD797BR. However, LT1028CS8 devices offer lower input bias current (30 nA versus 250 nA) and wider supply voltage range (8V to 36V versus 10V to 30V). These trade-offs reflect different circuit design objectives. LT1028CS8 substitution is appropriate only when reduced bandwidth is compatible with application requirements.

Q: What is the difference between LT1028CS8#PBF and LT1028CS8#TRPBF?

A: Both LT1028CS8#PBF and LT1028CS8#TRPBF are electrically identical. The difference is packaging format: LT1028CS8#PBF is supplied in tube packaging, while LT1028CS8#TRPBF is supplied in tape and reel (TR) format. Tape and reel packaging is typically used for automated assembly processes, while tube packaging is used for manual handling or lower-volume applications. Electrical specifications, performance, and 8-SOIC package dimensions are identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed—AD797BRZ, AD797ARZ, LT1028CS8#PBF, and LT1028CS8#TRPBF—are ROHS3 compliant and REACH unaffected. The original AD797BR does not specify compliance status. All parts carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use LT1028CS8 devices in applications requiring -40°C to 85°C operation?

A: No. LT1028CS8 devices operate within 0°C to 70°C temperature range, which does not cover the full -40°C to 85°C range of AD797BR. If your application requires operation below 0°C or above 70°C, LT1028CS8 substitution is not suitable. Use AD797BRZ or AD797ARZ instead, both of which maintain the -40°C to 85°C operating range.

Q: What is the supply voltage range compatibility for each substitute?

A: AD797BR, AD797BRZ, and AD797ARZ all operate within 10V to 30V supply voltage range. LT1028CS8#PBF and LT1028CS8#TRPBF operate within a wider range of 8V to 36V. If your design uses supply voltages below 10V or above 30V, LT1028CS8 devices are required. If your design operates within 10V to 30V, all substitutes are compatible.

Q: Which substitute part has the highest inventory availability?

A: LT1028CS8#TRPBF has the highest inventory with 88988 pieces in stock. AD797ARZ has 15535 pieces, AD797BRZ has 3339 pieces, and LT1028CS8#PBF has 5923 pieces. The original AD797BR has 1920 pieces remaining as obsolete stock.

Q: Is the 8-SOIC package identical across all substitute parts?

A: Yes. All parts use the 8-SOIC package with 0.154" (3.90mm) width. Package dimensions and pin configuration are identical, enabling direct PCB layout compatibility. Surface mount assembly processes are identical for all parts.