INA126U/2K5 Equivalent & Substitute Parts

Part Overview

The INA126U/2K5 is an instrumentation amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit amplifier is designed for precision signal conditioning applications requiring low input offset voltage and low input bias current. The part is currently in active production status with 3920 units in stock. Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters, or when the primary part becomes unavailable due to supply constraints or end-of-life considerations.

Substiute Parts

INA126U/2K5

Texas InstrumentsIn Stock: 4012INA126U/2K5 Datasheet

Current PartRFQ

AMP04ESZ

Analog Devices Inc.In Stock: 2716AMP04ESZ Datasheet

MFR RecommendedRFQ

AMP04ESZ-R7

Analog Devices Inc.In Stock: 2980AMP04ESZ-R7 Datasheet

MFR RecommendedRFQ

AMP04FSZ

Analog Devices Inc.In Stock: 3148AMP04FSZ Datasheet

MFR RecommendedRFQ

AMP04FSZ-R7

Analog Devices Inc.In Stock: 2465AMP04FSZ-R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA126U/2K5 is determined by compatibility across the following critical parameters:

Package and Mounting Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Functional Classification: All parts must be single-circuit instrumentation amplifiers operating within the specified temperature range of -40°C to 85°C.

Electrical Performance Boundaries: Substitute parts must operate within the supply voltage range of the primary part. The INA126U/2K5 accepts supply voltages from 2.7V to 36V. Substitute parts with minimum supply requirements of 5V operate within this range but with reduced lower-voltage capability.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and EAR99 ECCN classification to ensure regulatory equivalence.

The AMP04 series (AMP04ESZ, AMP04ESZ-R7, AMP04FSZ, AMP04FSZ-R7) from Analog Devices Inc. meets these substitution criteria. These parts differ in packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel) but share identical electrical specifications and the same 8-SOIC package footprint.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The INA126U/2K5 remains the preferred selection when supply availability is adequate and the specified electrical characteristics are required. This part offers the lowest supply current (175µA) and lowest input bias current (10nA) among the available options, making it suitable for battery-powered and ultra-low-power applications. The extended supply voltage range (2.7V to 36V) provides flexibility for diverse power supply configurations.

Substitute Part Selection: The AMP04 series (AMP04ESZ, AMP04ESZ-R7, AMP04FSZ, AMP04FSZ-R7) from Analog Devices Inc. serves as functional equivalents when the INA126U/2K5 is unavailable. These parts share identical package geometry and operating temperature range. The AMP04 series provides superior bandwidth performance (700kHz versus 200kHz) and lower input offset voltage (30µV versus 100µV), which may benefit applications requiring higher-frequency signal processing or tighter offset specifications.

Supply Voltage Consideration: The AMP04 series requires a minimum supply voltage of 5V, compared to the INA126U/2K5 minimum of 2.7V. Applications operating below 5V supply voltage cannot use AMP04 substitutes. The maximum supply voltage for AMP04 parts is 30V, compared to 36V for the INA126U/2K5.

Packaging Format Selection: Among AMP04 variants, selection between Tube (AMP04ESZ, AMP04FSZ), Cut Tape & Digi-Reel (AMP04ESZ-R7), and Tape & Reel (AMP04FSZ-R7) packaging depends on procurement and assembly requirements. All variants maintain identical electrical specifications and 8-SOIC package footprint.

Compliance Status: All listed parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory equivalence for applications subject to these requirements.

Frequently Asked Questions (FAQ)

Q: Can AMP04 parts directly replace INA126U/2K5 in all applications?

A: AMP04 parts are electrically compatible substitutes in applications where the supply voltage is 5V or higher and does not exceed 30V. Applications requiring supply voltages below 5V must use the INA126U/2K5. The improved bandwidth and lower input offset voltage of AMP04 parts may provide performance benefits in high-frequency signal conditioning applications.

Q: What is the difference between AMP04ESZ, AMP04ESZ-R7, AMP04FSZ, and AMP04FSZ-R7?

A: These part numbers represent the same electrical device in different packaging formats. AMP04ESZ and AMP04FSZ are supplied in Tube and Tape & Reel packaging respectively. The "-R7" suffix designates alternative packaging: AMP04ESZ-R7 is Cut Tape & Digi-Reel format, and AMP04FSZ-R7 is Tape & Reel format. Electrical specifications are identical across all variants.

Q: Are the 8-SOIC packages identical between INA126U/2K5 and AMP04 parts?

A: Yes. Both the INA126U/2K5 and all AMP04 variants use the 8-SOIC package with 0.154" (3.90mm) width. PCB footprints are identical, allowing direct physical substitution without layout modifications.

Q: What are the key electrical differences between INA126U/2K5 and AMP04?

A: The INA126U/2K5 offers lower supply current (175µA versus 750µA) and lower input bias current (10nA versus 22nA). The AMP04 series provides higher bandwidth (700kHz versus 200kHz) and lower input offset voltage (30µV versus 100µV). Supply voltage ranges differ: INA126U/2K5 operates from 2.7V to 36V, while AMP04 operates from 5V to 30V.

Q: Does moisture sensitivity level affect substitution compatibility?

A: Moisture sensitivity level (MSL) affects component handling and storage requirements but does not affect electrical substitution compatibility. The INA126U/2K5 has MSL 3 (168 hours), while AMP04 parts have MSL 1 (unlimited). AMP04 parts offer superior moisture tolerance, reducing handling constraints during assembly and storage.

Q: Are all listed parts currently in active production?

A: Yes. The INA126U/2K5 and all AMP04 variants (AMP04ESZ, AMP04ESZ-R7, AMP04FSZ, AMP04FSZ-R7) maintain active product status with current inventory availability.