AD628ARZ-R7 Equivalent & Substitute Parts

Part Overview

The AD628ARZ-R7 is a current sense amplifier manufactured by Analog Devices Inc., designed for single-circuit current sensing applications in 8-SOIC surface mount packaging. This linear amplifier operates across a wide supply voltage range of 4.5V to 36V and is specified for industrial and automotive environments with an operating temperature range of -40°C to 85°C. The device is currently in active product status with substantial inventory availability (107,541 pieces in stock). Substitute parts are identified based on matching package geometry, supply voltage compatibility, operating temperature range, and surface mount mounting type, which are the primary parameters governing functional interchangeability in this amplifier category.

Substiute Parts

AD628ARZ-R7

Analog Devices Inc.In Stock: 107553AD628ARZ-R7 Datasheet

Current PartRFQ

INA146UA

Texas InstrumentsIn Stock: 1350INA146UA Datasheet

SimilarRFQ

INA146UA/2K5

Texas InstrumentsIn Stock: 3954INA146UA/2K5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AD628ARZ-R7 are identified based on the following critical parameters that determine functional compatibility:

Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout and assembly process compatibility.

Supply Voltage Range: Substitute parts must operate across the minimum 4.5V to maximum 36V supply voltage span to maintain circuit functionality across the intended application range.

Operating Temperature Range: Substitute parts must support the -40°C to 85°C operating temperature specification to ensure reliability in the target environment.

Mounting Type: All substitute parts must be surface mount devices to align with modern manufacturing processes and board design requirements.

Number of Circuits: Substitute parts must contain a single amplifier circuit to match the functional density of the main part.

The identified substitute parts—INA146UA and INA146UA/2K5 (both from Texas Instruments)—meet all four critical compatibility parameters. These parts are differential amplifiers rather than current sense amplifiers, but they share the same package geometry, supply voltage range, operating temperature specification, and mounting type. The functional difference between current sense and differential amplifier topologies does not preclude substitution when circuit design accommodates the alternative amplifier architecture.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: INA146UA/2K5 is the preferred substitute part. This device maintains active product status, ensuring long-term availability and supply chain stability. It is supplied in Cut Tape (CT) & Digi-Reel® packaging, matching the packaging format of the main part. The device carries ROHS3 compliance and REACH unaffected status, aligning with regulatory requirements. Inventory availability is substantial at 3,920 pieces in stock.

Secondary Selection: INA146UA is an alternative substitute with identical electrical specifications to INA146UA/2K5. However, this part carries a Last Time Buy product status, indicating limited future availability. It is supplied in Tube packaging rather than Cut Tape & Digi-Reel®, which may require process adjustments for automated assembly. This part should be selected only when INA146UA/2K5 is unavailable and supply chain continuity is not a primary concern.

Compliance Considerations: Both substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the main part. The Moisture Sensitivity Level (MSL) of the substitute parts is 3 (168 Hours), compared to MSL 1 (Unlimited) for the main part. This difference requires adherence to moisture control procedures during storage and handling, with a maximum shelf life of 168 hours after bag opening under specified humidity conditions.

Frequently Asked Questions (FAQ)

Q: Can INA146UA/2K5 be used as a direct replacement for AD628ARZ-R7 in all applications?

A: INA146UA/2K5 shares the same package geometry, supply voltage range, operating temperature specification, and mounting type as AD628ARZ-R7. However, the functional difference between current sense and differential amplifier topologies requires circuit design evaluation. The substitute part has different input bias current (50 nA vs. 1.5 nA), input offset voltage (1 mV vs. 150 µV), and supply current (570 µA vs. 1.6 mA) specifications. Circuit designs must accommodate these parameter differences.

Q: What is the difference between INA146UA and INA146UA/2K5?

A: Both parts are electrically identical differential amplifiers with the same specifications. The primary differences are packaging format and product status. INA146UA is supplied in Tube packaging and carries Last Time Buy status. INA146UA/2K5 is supplied in Cut Tape (CT) & Digi-Reel® packaging and maintains Active product status. For new designs, INA146UA/2K5 is the recommended selection.

Q: Does the Moisture Sensitivity Level difference affect substitution?

A: The substitute parts carry MSL 3 (168 Hours) compared to MSL 1 (Unlimited) for the main part. This requires moisture control procedures during storage and handling. Components must be used within 168 hours of bag opening under specified humidity conditions. Proper moisture management during assembly prevents reliability issues.

Q: Are the package dimensions identical between the main part and substitute parts?

A: Yes. All three parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. PCB footprints and assembly processes are directly compatible without modification.

Q: What is the impact of the slew rate difference?

A: The main part AD628ARZ-R7 has a slew rate of 0.3 V/µs, while substitute parts INA146UA and INA146UA/2K5 have a slew rate of 0.45 V/µs. The substitute parts exhibit faster voltage transition rates. Circuit designs must evaluate whether this difference affects signal integrity, noise performance, or stability in the target application.

Q: What is the impact of the bandwidth difference?

A: The main part AD628ARZ-R7 has a -3dB bandwidth of 600 kHz, while substitute parts have 550 kHz. The main part provides slightly wider bandwidth. Applications requiring maximum frequency response should evaluate whether the 50 kHz difference is acceptable for the intended signal processing requirements.

Q: Are all three parts RoHS compliant?

A: Yes. AD628ARZ-R7, INA146UA, and INA146UA/2K5 all carry ROHS3 compliance certification and REACH unaffected status, meeting environmental and regulatory requirements for industrial and commercial applications.