INA146UA Equivalent & Substitute Parts

Part Overview

The INA146UA is a differential amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit operational amplifier is designed for precision differential signal conditioning applications requiring low input bias current and stable gain characteristics across a wide supply voltage range. The INA146UA is currently classified as Last Time Buy, indicating discontinued production status. Identification of equivalent substitute parts is necessary for design continuity, long-term component sourcing, and production planning.

Substiute Parts

INA146UA

Texas InstrumentsIn Stock: 1350INA146UA Datasheet

Current PartRFQ

INA146UA/2K5

Texas InstrumentsIn Stock: 3954INA146UA/2K5 Datasheet

MFR RecommendedRFQ

AD628ARZ

Analog Devices Inc.In Stock: 13488AD628ARZ Datasheet

MFR RecommendedRFQ

AD628ARZ-R7

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

MFR RecommendedRFQ

AD628ARZ-RL

Analog Devices Inc.In Stock: 2613AD628ARZ-RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the INA146UA are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following parameters:

Mechanical Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility without layout redesign.

Electrical Compatibility: Substitute parts must operate within the same supply voltage range (4.5V to 36V minimum and maximum) and maintain the same operating temperature range (-40°C to 85°C) to ensure functional equivalence in the target application.

Functional Classification: The INA146UA is classified as a differential amplifier. Substitute parts identified include both differential amplifiers (INA146UA/2K5) and current sense amplifiers (AD628 series). Current sense amplifiers are functionally related but serve specialized applications; substitution requires application-level verification.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for production and distribution.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - INA146UA/2K5: This part is the direct functional equivalent of the INA146UA, manufactured by Texas Instruments with identical electrical specifications and the same 8-SOIC package. The INA146UA/2K5 maintains active product status and is available in higher inventory quantities (3920 units) compared to the original part. This substitute is recommended for applications requiring direct replacement without circuit modification. The packaging format differs (Cut Tape & Digi-Reel versus Tube), which affects procurement and handling but does not impact electrical performance.

Secondary Substitutes - AD628ARZ, AD628ARZ-R7, AD628ARZ-RL: These Analog Devices parts are current sense amplifiers classified as functionally related but not direct equivalents. While they share the same 8-SOIC package, identical supply voltage range, and operating temperature specifications, they differ in amplifier type classification. The AD628 series exhibits superior input bias current performance (1.5 nA versus 50 nA) and lower input offset voltage (150 µV versus 1 mV), along with higher supply current consumption (1.6 mA versus 570 µA). These parts are suitable for applications where current sensing functionality is required or where the improved input characteristics provide system-level benefits. The AD628ARZ-R7 variant offers the highest inventory availability (107541 units) and represents the most accessible long-term sourcing option among the AD628 series.

Compliance and Regulatory Equivalence: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for production environments subject to these requirements. The AD628 series offers improved moisture sensitivity classification (MSL 1 Unlimited versus MSL 3 168 Hours), which may provide advantages in storage and handling for extended production timelines.

Frequently Asked Questions (FAQ)

Q: Can the INA146UA/2K5 be used as a direct replacement for the INA146UA without circuit modification?

A: Yes. The INA146UA/2K5 is electrically and mechanically identical to the INA146UA. Both parts share the same differential amplifier specifications, 8-SOIC package footprint, supply voltage range (4.5V to 36V), and operating temperature range (-40°C to 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance.

Q: What is the functional difference between the INA146UA and the AD628ARZ series?

A: The INA146UA is classified as a differential amplifier, while the AD628ARZ series are current sense amplifiers. Although both are single-circuit operational amplifiers in 8-SOIC packages with compatible supply voltage ranges, they serve different application categories. The AD628 series are optimized for current sensing applications and exhibit superior input bias current (1.5 nA versus 50 nA) and input offset voltage (150 µV versus 1 mV) characteristics. Substitution of AD628 parts for INA146UA applications requires application-level verification to confirm functional compatibility.

Q: Are all substitute parts compatible with the same PCB footprint as the INA146UA?

A: Yes. All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. PCB footprints designed for the INA146UA will accommodate all listed substitute parts without layout modification.

Q: What is the significance of the Last Time Buy status for the INA146UA?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of the INA146UA. This classification signals that existing inventory will be depleted and no future production runs are planned. Component selection should transition to active substitute parts such as INA146UA/2K5 or AD628 series to ensure long-term design continuity and production availability.

Q: Which substitute part offers the best long-term availability?

A: The AD628ARZ-R7 offers the highest inventory availability at 107541 units and maintains active product status with Analog Devices. This part is available in Cut Tape & Digi-Reel packaging format, which supports high-volume production environments. However, functional equivalence must be confirmed for the specific application before selection.

Q: How do the moisture sensitivity levels affect component handling and storage?

A: The INA146UA carries MSL 3 (168 Hours) classification, requiring controlled storage conditions and limiting shelf life to 168 hours after moisture exposure. The AD628 series carry MSL 1 (Unlimited) classification, which permits indefinite storage without moisture control requirements. For applications with extended production timelines or variable storage conditions, the AD628 series may provide logistical advantages.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (INA146UA/2K5, AD628ARZ, AD628ARZ-R7, AD628ARZ-RL) maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for production environments subject to these requirements.