INA122UA Instrumentation Amplifier Equivalent & Substitute Parts

Part Overview

The INA122UA is a single-channel instrumentation amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device operates across a wide supply voltage range of 2.2 V to 36 V and is designed for precision signal conditioning applications requiring low input bias current and low input offset voltage. The INA122UA is currently in Last Time Buy status, indicating end-of-life production. Identification of equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for ongoing production and maintenance applications.

Substiute Parts

INA122UA

Texas InstrumentsIn Stock: 1384INA122UA Datasheet

Current PartRFQ

INA122UA/2K5

Texas InstrumentsIn Stock: 17694INA122UA/2K5 Datasheet

MFR RecommendedRFQ

AD627ARZ

Analog Devices Inc.In Stock: 10296AD627ARZ Datasheet

MFR RecommendedRFQ

AD627ARZ-R7

Analog Devices Inc.In Stock: 40187AD627ARZ-R7 Datasheet

MFR RecommendedRFQ

AD627ARZ-RL

Analog Devices Inc.In Stock: 10489AD627ARZ-RL Datasheet

MFR RecommendedRFQ

AD627BRZ

Analog Devices Inc.In Stock: 16991AD627BRZ Datasheet

MFR RecommendedRFQ

AD627BRZ-R7

Analog Devices Inc.In Stock: 3912AD627BRZ-R7 Datasheet

MFR RecommendedRFQ

AD627BRZ-RL

Analog Devices Inc.In Stock: 2949AD627BRZ-RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA122UA is determined by strict equivalence in the following critical parameters: amplifier type (instrumentation), number of circuits (1), package type (8-SOIC), mounting method (surface mount), and supply voltage range (2.2 V to 36 V). All substitute parts identified maintain these core specifications.

The substitute parts are grouped into two categories based on performance characteristics:

Category 1: Direct Functional Equivalents (Texas Instruments INA122 Series) The INA122UA/2K5 is a direct equivalent manufactured by Texas Instruments with identical electrical specifications. This part differs only in packaging format (Cut Tape & Digi-Reel) and product status (Active vs. Last Time Buy).

Category 2: Enhanced Performance Alternatives (Analog Devices AD627 Series) The AD627ARZ, AD627ARZ-R7, AD627ARZ-RL, AD627BRZ, AD627BRZ-R7, and AD627BRZ-RL are manufactured by Analog Devices and provide enhanced performance characteristics while maintaining compatibility with the INA122UA footprint and supply voltage requirements. These parts feature rail-to-rail output capability, lower input bias current (2 nA vs. 10 nA), and lower input offset voltage specifications.

Substitution logic is based strictly on: identical package geometry (8-SOIC), compatible supply voltage range (2.2 V to 36 V minimum and maximum), matching amplifier type (instrumentation), single circuit configuration, and surface mount compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): The INA122UA/2K5 is the recommended substitute when exact electrical and performance specifications must be maintained. This part is manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. The INA122UA/2K5 differs from the original INA122UA only in packaging format (Cut Tape & Digi-Reel vs. standard packaging) and product lifecycle status. Both parts are ROHS3 compliant and REACH unaffected.

For Enhanced Performance Applications: The Analog Devices AD627 series (AD627ARZ, AD627ARZ-R7, AD627ARZ-RL, AD627BRZ, AD627BRZ-R7, AD627BRZ-RL) provides superior performance characteristics while maintaining full compatibility with the INA122UA footprint and supply voltage specifications. These parts feature:

• Lower input bias current (2 nA vs. 10 nA)
• Lower input offset voltage (50 µV for AD627A variants; 25 µV for AD627B variants vs. 150 µV)
• Rail-to-rail output capability
• Superior moisture sensitivity rating (MSL 1 vs. MSL 3)
• Active product status with extended availability

Selection between AD627ARZ and AD627BRZ variants depends on input offset voltage requirements. The AD627B series offers tighter offset voltage specifications (25 µV maximum) compared to the AD627A series (50 µV maximum). Packaging variants (-R7 and -RL designations) indicate different tape and reel configurations for automated assembly; electrical specifications remain identical across these variants.

All substitute parts maintain the 8-SOIC package geometry, surface mount compatibility, and supply voltage range (2.2 V to 36 V) required for direct PCB-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the INA122UA/2K5 be used as a direct replacement for the INA122UA?

A: Yes. The INA122UA/2K5 is electrically and functionally identical to the INA122UA. Both parts share identical specifications for slew rate (0.16 V/µs), bandwidth (120 kHz), input bias current (10 nA), input offset voltage (150 µV), and supply voltage range (2.2 V to 36 V). The primary difference is packaging format and product lifecycle status. The INA122UA/2K5 is in Active status, providing superior long-term availability.

Q: What are the key differences between the Texas Instruments INA122 and Analog Devices AD627 series?

A: The primary differences are input bias current, input offset voltage, and output type. The INA122UA specifies 10 nA input bias current and 150 µV input offset voltage. The AD627A series specifies 2 nA input bias current and 50 µV input offset voltage. The AD627B series specifies 2 nA input bias current and 25 µV input offset voltage. All AD627 variants feature rail-to-rail output capability. Slew rate and bandwidth differ: INA122UA operates at 0.16 V/µs and 120 kHz, while AD627 variants operate at 0.06 V/µs and 80 kHz. Both families maintain identical supply voltage range (2.2 V to 36 V) and 8-SOIC package geometry.

Q: Are the AD627 variants with different packaging designations (-R7, -RL) electrically equivalent?

A: Yes. The designations -R7 and -RL refer to tape and reel packaging configurations for automated assembly. AD627ARZ, AD627ARZ-R7, and AD627ARZ-RL are electrically identical. Similarly, AD627BRZ, AD627BRZ-R7, and AD627BRZ-RL are electrically identical. Selection between these variants depends on assembly equipment compatibility and supply chain requirements, not electrical performance.

Q: Can I substitute an AD627 for an INA122UA in an existing design without circuit modifications?

A: Substitution is possible due to identical package geometry (8-SOIC), matching supply voltage range (2.2 V to 36 V), and compatible amplifier type (instrumentation, single circuit). However, the AD627 series exhibits different performance characteristics: lower input bias current (2 nA vs. 10 nA), lower input offset voltage (50 µV or 25 µV vs. 150 µV), lower slew rate (0.06 V/µs vs. 0.16 V/µs), and lower bandwidth (80 kHz vs. 120 kHz). These differences may affect circuit behavior in applications sensitive to slew rate or bandwidth. Circuit validation is required to confirm compatibility with specific application requirements.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference between INA122UA and AD627 parts?

A: The INA122UA is rated MSL 3 (168 hours), while AD627 variants are rated MSL 1 (unlimited). MSL rating indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. MSL 3 requires reflow soldering within 168 hours of package opening. MSL 1 has no time restriction. For high-volume manufacturing with extended component storage or in humid environments, AD627 parts with MSL 1 rating provide superior handling flexibility and reduced risk of moisture-induced defects.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: Yes. The INA122UA, INA122UA/2K5, and all AD627 variants listed are ROHS3 compliant and REACH unaffected. All parts are suitable for applications requiring environmental compliance with European Union directives.

Q: What inventory considerations should guide part selection?

A: The INA122UA is in Last Time Buy status with 1,301 pieces in stock. The INA122UA/2K5 is in Active status with 17,600 pieces available. AD627 variants show varying inventory levels: AD627ARZ (10,200 pcs), AD627ARZ-R7 (40,116 pcs), AD627ARZ-RL (10,422 pcs), AD627BRZ (16,927 pcs), AD627BRZ-R7 (3,850 pcs), and AD627BRZ-RL (2,900 pcs). For new designs or long-term production, Active status parts with higher inventory levels (INA122UA/2K5 or AD627ARZ-R7) are recommended to ensure supply chain continuity.