INA2126PA Equivalent & Substitute Parts

Part Overview

The INA2126PA is a dual-channel instrumentation amplifier manufactured by Texas Instruments in a 16-pin DIP (Dual In-line Package) configuration. This device is classified as obsolete, indicating that it is no longer in active production. The INA2126PA remains available in inventory (2040 units) as new original stock.

Instrumentation amplifiers are precision analog devices used for accurate signal conditioning, measurement, and data acquisition applications. The obsolete status of the INA2126PA necessitates identification of equivalent substitute components to ensure design continuity and procurement availability for new projects or production runs.

Substiute Parts

INA2126PA

Texas InstrumentsIn Stock: 2131INA2126PA Datasheet

Current PartRFQ

INA2126UA

Texas InstrumentsIn Stock: 3644INA2126UA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA2126PA is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Amplifier type (instrumentation)
• Number of circuits (2 channels)
• Slew rate (0.4 V/µs)
• -3dB bandwidth (200 kHz)
• Voltage - input offset (150 µV)
• Current - supply per channel (175 µA)
• Current - output per channel (10 mA)
• Supply voltage range (2.7 V to 36 V)

Mechanical Compatibility Criteria:

• Package type and pin configuration
• Mounting method (through hole vs. surface mount)
• Physical dimensions

Compliance Criteria:

• RoHS3 compliance
• REACH status
• Product status (active vs. obsolete)

The INA2126UA is identified as a manufacturer-recommended substitute. While it maintains identical electrical performance specifications, it differs in package type (16-SOIC surface mount versus 16-DIP through hole), operating temperature range, input bias current, and product status (active).

Parameter Comparison

Engineering Selection Recommendations

Electrical Equivalence: The INA2126UA provides complete electrical equivalence to the INA2126PA across all core instrumentation amplifier specifications. Both devices share identical slew rate, bandwidth, input offset voltage, supply current, and output current ratings. The INA2126UA exhibits superior input bias current performance (10 nA versus 50 nA), which represents an improvement in precision characteristics.

Compliance Status: Both the INA2126PA and INA2126UA maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards.

Product Status Consideration: The INA2126PA is classified as obsolete, while the INA2126UA is active in production. Selection of the INA2126UA ensures long-term procurement availability and supply chain continuity.

Package and Mounting Differences: The primary distinction between these devices is the package configuration. The INA2126PA uses a through-hole 16-DIP package, while the INA2126UA employs a surface-mount 16-SOIC package. This difference requires corresponding changes to printed circuit board layout and assembly processes. Through-hole mounting is suitable for breadboarding, prototyping, and legacy designs. Surface-mount packaging is standard for modern production environments and enables higher-density board layouts.

Temperature Range Consideration: The INA2126PA supports an extended operating temperature range (-55°C to 125°C) compared to the INA2126UA (-40°C to 85°C). Applications requiring operation below -40°C or above 85°C must retain the INA2126PA or identify alternative solutions.

Moisture Sensitivity: The INA2126PA carries MSL 1 (unlimited moisture sensitivity level), while the INA2126UA carries MSL 2 (1-year floor life). This difference affects storage and handling requirements in humid environments.

Frequently Asked Questions (FAQ)

Q: Can the INA2126UA directly replace the INA2126PA in an existing design?

A: Electrical substitution is possible due to identical core specifications. However, physical substitution requires PCB redesign because the INA2126UA uses surface-mount 16-SOIC packaging while the INA2126PA uses through-hole 16-DIP packaging. Pin-to-pin electrical compatibility exists, but mounting methods differ fundamentally.

Q: What is the significance of the input bias current difference (50 nA vs. 10 nA)?

A: The INA2126UA exhibits lower input bias current, which represents superior precision performance. This improvement reduces errors in high-impedance signal conditioning applications. For most standard instrumentation applications, both specifications are acceptable.

Q: Why is the INA2126PA classified as obsolete?

A: Obsolete status indicates that Texas Instruments has discontinued active production of this device. The INA2126UA represents the current active product line continuation of the INA2126 series.

Q: Are there temperature range limitations when substituting the INA2126UA?

A: Yes. The INA2126UA operates from -40°C to 85°C, which is narrower than the INA2126PA range of -55°C to 125°C. Applications requiring extended temperature operation must retain the INA2126PA or identify alternative instrumentation amplifiers with appropriate temperature specifications.

Q: What are the moisture sensitivity implications?

A: The INA2126PA (MSL 1) has unlimited floor life and requires no special moisture control during storage. The INA2126UA (MSL 2) has a 1-year floor life limit and requires controlled humidity storage conditions. This affects inventory management and handling procedures.

Q: Is the INA2126UA suitable for new product designs?

A: Yes. The INA2126UA is active in production and recommended by the manufacturer as the current equivalent. New designs should incorporate the INA2126UA unless specific requirements (extended temperature range, through-hole mounting, or unlimited moisture sensitivity) necessitate alternative solutions.

Q: What PCB modifications are required when switching from INA2126PA to INA2126UA?

A: Complete PCB redesign is necessary. The 16-DIP through-hole footprint must be replaced with a 16-SOIC surface-mount footprint. Pin assignments remain identical, but physical layout, trace routing, and assembly processes differ significantly.