INA126P Equivalent & Substitute Parts

Part Overview

The INA126P is a single-circuit instrumentation amplifier manufactured by Texas Instruments in 8-PDIP through-hole packaging. This component is classified as obsolete, though 4640 units remain in current inventory. Instrumentation amplifiers serve critical functions in precision measurement, signal conditioning, and data acquisition applications where high input impedance, low offset voltage, and excellent common-mode rejection are required.

Due to the obsolete product status of the INA126P, identifying equivalent and substitute components is essential for design continuity, long-term supply chain reliability, and new product development. Substitutes must maintain functional equivalence within the specified electrical and mechanical parameter ranges.

Substiute Parts

INA126P

Texas InstrumentsIn Stock: 4676INA126P Datasheet

Current PartRFQ

INA126UA/2K5

Texas InstrumentsIn Stock: 32733INA126UA/2K5 Datasheet

MFR RecommendedRFQ

AMP04EPZ

Analog Devices Inc.In Stock: 1515AMP04EPZ Datasheet

MFR RecommendedRFQ

AMP04FPZ

Analog Devices Inc.In Stock: 1334AMP04FPZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the INA126P is determined by the following critical parameters:

Functional Equivalence Criteria:

• Amplifier Type: Instrumentation (single circuit)
• Operating Temperature Range: -40°C to 85°C minimum
• Supply Voltage Compatibility: Minimum 2.7 V to Maximum 36 V
• RoHS3 Compliance and REACH Unaffected status

Packaging and Mounting Considerations: Substitutes are grouped into two categories based on mounting technology:

1. Through-Hole Equivalents (8-DIP): Direct pin-compatible replacements maintaining identical footprint and mechanical interface. These include AMP04EPZ and AMP04FPZ from Analog Devices Inc.

2. Surface-Mount Alternative (8-SOIC): Functional equivalent with different mounting technology. The INA126UA/2K5 provides identical electrical performance in a surface-mount package, suitable for designs transitioning to SMT assembly.

Electrical Parameter Tolerance: All substitute parts maintain the core instrumentation amplifier functionality. Variations in secondary parameters (slew rate, bandwidth, input bias current, input offset voltage, supply current) are acceptable provided they do not exceed the application's design specifications. The selection of a specific substitute depends on the target application's performance requirements and packaging constraints.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole PCB Designs:

The AMP04EPZ and AMP04FPZ from Analog Devices Inc. provide direct mechanical compatibility with the INA126P footprint. Both parts are manufactured by Analog Devices and maintain active product status, ensuring long-term availability and supply chain stability. These components feature enhanced electrical performance characteristics, including higher bandwidth (700 kHz versus 200 kHz), lower input offset voltage (30 µV versus 100 µV), and increased output current capability (30 mA versus 10 mA). The trade-off is increased supply current consumption (750 µA versus 175 µA) and a narrower maximum supply voltage range (30 V maximum versus 36 V maximum). Both AMP04 variants carry ROHS3 compliance and unlimited moisture sensitivity rating.

For Surface-Mount PCB Designs:

The INA126UA/2K5 from Texas Instruments offers functional equivalence in 8-SOIC surface-mount packaging. This part maintains identical electrical specifications to the INA126P (0.4 V/µs slew rate, 200 kHz bandwidth, 175 µA supply current) while providing the manufacturing and assembly advantages of surface-mount technology. The INA126UA/2K5 is currently in active production with significantly higher inventory availability (32700 units). The primary consideration is the moisture sensitivity level of 2 (1 Year) compared to level 1 (Unlimited) for through-hole packages, which may require controlled storage conditions in high-humidity environments.

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory posture of the original INA126P. Selection between substitutes should be based on packaging requirements, supply voltage constraints, and performance specifications demanded by the target application.

Frequently Asked Questions (FAQ)

Q: Can the AMP04EPZ or AMP04FPZ be used as direct replacements for the INA126P in existing designs?

A: Yes, both AMP04 variants are pin-compatible with the INA126P in 8-DIP through-hole packaging. However, the increased supply current (750 µA versus 175 µA) and narrower maximum supply voltage (30 V versus 36 V) must be evaluated against your circuit design. If your application operates above 30 V supply voltage or has strict power budget constraints, these substitutes may not be suitable.

Q: What is the primary advantage of the INA126UA/2K5 over the INA126P?

A: The INA126UA/2K5 is an active product with robust supply chain availability (32700 units in stock). It maintains identical electrical performance to the INA126P while offering surface-mount packaging benefits for modern PCB assembly processes. The trade-off is the requirement for controlled moisture handling (MSL 2, 1 Year) versus unlimited storage for through-hole packages.

Q: Are the AMP04EPZ and AMP04FPZ electrically identical?

A: Yes, both AMP04 variants share identical electrical specifications. The designation difference (EPZ versus FPZ) reflects manufacturing or packaging variations from Analog Devices Inc., but electrical performance is equivalent. Both are supplied in tube packaging and maintain active product status.

Q: What are the key electrical differences between the INA126P and AMP04 series?

A: The AMP04 series offers superior performance in bandwidth (700 kHz versus 200 kHz) and input offset voltage (30 µV versus 100 µV), making it suitable for higher-speed or higher-precision applications. However, the AMP04 requires higher supply current (750 µA versus 175 µA) and operates within a narrower supply voltage range (5 V to 30 V versus 2.7 V to 36 V). Application requirements determine which trade-off is acceptable.

Q: Can I use the INA126UA/2K5 in a through-hole PCB design?

A: No. The INA126UA/2K5 is packaged in 8-SOIC surface-mount format and cannot be directly inserted into through-hole PCB footprints. This part requires surface-mount assembly equipment and PCB redesign to accommodate the SOIC package footprint.

Q: What is the significance of the moisture sensitivity level difference?

A: The INA126P and AMP04 variants carry MSL 1 (Unlimited), allowing indefinite storage without moisture control. The INA126UA/2K5 carries MSL 2 (1 Year), requiring that the component be used within one year of the moisture barrier bag opening or stored in controlled humidity conditions. This affects inventory management and long-term stockpiling strategies.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The INA126P, INA126UA/2K5, AMP04EPZ, and AMP04FPZ all carry ROHS3 compliance certification and REACH Unaffected status, ensuring regulatory alignment for applications subject to environmental restrictions.