AD629AR Equivalent & Substitute Parts

Part Overview

The AD629AR is a current sense amplifier manufactured by Analog Devices Inc., designed for linear amplification applications in 8-SOIC surface mount packaging. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and procurement needs. The AD629AR operates across a 5V to 36V supply range with a slew rate of 2.1V/µs and -3dB bandwidth of 500 kHz, making it suitable for precision current sensing applications.

Substiute Parts

AD629AR

Analog Devices Inc.In Stock: 1628AD629AR Datasheet

Current PartRFQ

AD629ARZ

Analog Devices Inc.In Stock: 16458AD629ARZ Datasheet

DirectRFQ

AD8479ARZ

Analog Devices Inc.In Stock: 1845AD8479ARZ Datasheet

SimilarRFQ

INA117KU

Texas InstrumentsIn Stock: 1496INA117KU Datasheet

SimilarRFQ

INA117KU/2K5

Texas InstrumentsIn Stock: 17460INA117KU/2K5 Datasheet

SimilarRFQ

INA134UA

Texas InstrumentsIn Stock: 2013INA134UA Datasheet

SimilarRFQ

INA134UA/2K5

Texas InstrumentsIn Stock: 30218INA134UA/2K5 Datasheet

SimilarRFQ

INA154U

Texas InstrumentsIn Stock: 65944INA154U Datasheet

SimilarRFQ

INA154U/2K5

Texas InstrumentsIn Stock: 2741INA154U/2K5 Datasheet

SimilarRFQ

INA154UA

Texas InstrumentsIn Stock: 2024INA154UA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD629AR is determined by compatibility across the following critical parameters: package type (8-SOIC surface mount), supply voltage range (5V to 36V minimum), operating temperature range (-40°C to 85°C), and functional amplifier classification. Substitute parts are grouped into two categories:

Direct Equivalent: Parts that maintain identical electrical specifications and amplifier type classification, differing only in product status or packaging format.

Functional Equivalent: Parts that operate within the same supply voltage and temperature ranges, share the 8-SOIC package, and provide amplification functionality, though with different amplifier type classifications or performance characteristics.

The following parameters form the basis for substitution evaluation:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply Span (Min): 5 V or lower
• Voltage - Supply Span (Max): 36 V or higher
• Operating Temperature: -40°C to 85°C or extended range
• Number of Circuits: 1

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent - Recommended Primary Substitute:

The AD629ARZ is the direct equivalent replacement for the AD629AR. Both parts are manufactured by Analog Devices Inc. and share identical electrical specifications: 2.1V/µs slew rate, 500 kHz bandwidth, 200 µV input offset, and 5V to 36V supply range. The AD629ARZ is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity rating. This part is available in tube packaging format and represents the optimal substitution path for the obsolete AD629AR.

Secondary Functional Equivalents:

The INA154U, INA154U/2K5, and INA154UA are differential amplifiers from Texas Instruments that operate within the required 8-SOIC package and -40°C to 85°C temperature range. These parts support the full 36V maximum supply voltage and provide enhanced performance characteristics including 14V/µs slew rate, 3.1 MHz bandwidth, and 100 µV input offset voltage. These parts are suitable for applications where improved bandwidth and slew rate performance are beneficial. All three variants are ROHS3 compliant and actively produced.

The INA117KU and INA117KU/2K5 are differential amplifiers with 2.6V/µs slew rate and 200 kHz bandwidth, offering intermediate performance between the AD629AR and INA154 series. These parts require a minimum 10V supply voltage, which may limit applicability in designs requiring 5V operation.

Compliance and Availability Considerations:

All recommended substitute parts carry ROHS3 compliance certification. The AD629ARZ maintains the lowest moisture sensitivity level (MSL 1) matching the original part. Texas Instruments alternatives carry MSL 3 (168 Hours) ratings. Current inventory availability is highest for INA134UA/2K5 (30,200 units) and INA154U (65,880 units), providing supply chain stability for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can the AD629ARZ directly replace the AD629AR without circuit modifications?

A: Yes. The AD629ARZ is electrically and functionally identical to the AD629AR. Both parts share the same 8-SOIC package, supply voltage range (5V to 36V), operating temperature range (-40°C to 85°C), and all key electrical parameters including slew rate, bandwidth, and input offset voltage. No circuit modifications are required.

Q: What is the primary reason for substituting the AD629AR?

A: The AD629AR is classified as obsolete. The AD629ARZ provides continuity of supply while maintaining identical performance specifications. For new designs or long-term production requirements, the AD629ARZ is the recommended replacement.

Q: Are the Texas Instruments INA154 series parts suitable replacements?

A: The INA154U, INA154U/2K5, and INA154UA are functionally compatible within the 8-SOIC package and temperature range. However, they are differential amplifiers rather than current sense amplifiers. These parts offer superior performance with 14V/µs slew rate and 3.1 MHz bandwidth compared to the AD629AR's 2.1V/µs and 500 kHz specifications. Selection depends on application requirements for bandwidth and slew rate performance.

Q: What is the difference between INA154U and INA154U/2K5?

A: Both parts are electrically identical differential amplifiers with the same electrical specifications. The primary difference is packaging format: INA154U is supplied in tube packaging, while INA154U/2K5 is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement and assembly requirements.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original AD629AR does not specify RoHS status, but all active production alternatives meet current environmental compliance standards.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: The AD629AR and AD629ARZ carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. Texas Instruments alternatives carry MSL 3 (168 Hours), requiring controlled storage conditions and limiting shelf life to 168 hours after moisture barrier bag opening. This may impact procurement and inventory management strategies.

Q: Can the AD8479ARZ replace the AD629AR?

A: The AD8479ARZ is a general-purpose amplifier with rail-to-rail output, differing from the AD629AR's current sense amplifier classification. While it shares the 8-SOIC package and 5V to 36V supply range, it offers different performance characteristics: 8V/µs slew rate, 130 kHz bandwidth, and 500 µV input offset. This part is suitable only for applications where general-purpose amplification is acceptable and the lower bandwidth requirement is compatible with system design.

Q: What supply voltage constraints apply to substitute selection?

A: The AD629AR operates from 5V minimum supply voltage. The INA117 series requires 10V minimum, limiting their use in 5V-only systems. The AD629ARZ, AD8479ARZ, and INA154 series all support 5V minimum operation, maintaining full compatibility with the original design's supply voltage requirements.

Q: Are there any temperature range limitations with substitute parts?

A: The AD629AR and most substitute parts operate across -40°C to 85°C. The AD8479ARZ extends to -40°C to 125°C, providing enhanced high-temperature performance if required. All other alternatives maintain the -40°C to 85°C range matching the original specification.