INA125PA Equivalent & Substitute Parts

Part Overview

The INA125PA is a single-channel instrumentation amplifier manufactured by Texas Instruments, housed in a 16-pin DIP package for through-hole mounting applications. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The INA125PA provides precision signal conditioning with a -3dB bandwidth of 150 kHz and operates across a wide supply voltage range of 2.7V to 36V, making it suitable for industrial measurement and data acquisition systems.

Due to Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term component sourcing strategy. The primary substitute maintains identical electrical performance while offering alternative packaging and current product status.

Substiute Parts

INA125PA

Texas InstrumentsIn Stock: 3453INA125PA Datasheet

Current PartRFQ

INA125UA/2K5

Texas InstrumentsIn Stock: 2069INA125UA/2K5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the INA125PA is determined by strict equivalence across all critical electrical parameters. The substitute part must maintain identical specifications in the following categories:

Electrical Performance Criteria:

• Amplifier type (Instrumentation)
• Number of circuits (1)
• Slew rate (0.2 V/µs)
• -3dB bandwidth (150 kHz)
• Input bias current (10 nA)
• Input offset voltage (50 µV)
• Supply current (460 µA)
• Output current per channel (12 mA)
• Supply voltage range (2.7V to 36V)
• Operating temperature range (-40°C to 85°C)

Compliance & Regulatory Criteria:

• RoHS3 compliance
• REACH unaffected status
• ECCN classification (EAR99)

The INA125UA/2K5 qualifies as a direct electrical substitute, differing only in packaging format (16-SOIC surface mount versus 16-DIP through hole) and product lifecycle status (Active versus Last Time Buy). This substitution is valid for applications where PCB layout and assembly process can accommodate surface-mount technology.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole Assembly Applications: The INA125PA remains the appropriate choice when PCB design and manufacturing processes are committed to through-hole technology. However, given Last Time Buy status, inventory procurement should be evaluated against long-term production forecasts. Current stock of 3400 units provides a defined supply window.

For Surface-Mount Assembly Applications: The INA125UA/2K5 is the direct electrical equivalent for designs utilizing surface-mount assembly processes. This part carries Active product status, ensuring long-term availability and supply chain stability. The 16-SOIC package (0.154" width, 3.90mm) is compatible with standard SMT assembly equipment and PCB layouts designed for SOIC footprints. Current inventory of 1994 units supports immediate procurement.

Compliance Considerations: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. ECCN classification (EAR99) is identical for both variants.

Supply Chain Strategy: Selection between INA125PA and INA125UA/2K5 should prioritize long-term component availability. The Active status of INA125UA/2K5 provides design continuity beyond the Last Time Buy window of INA125PA.

Frequently Asked Questions (FAQ)

Q: Can INA125UA/2K5 be used as a direct replacement for INA125PA in existing designs?

A: Electrical substitution is complete. However, physical substitution requires PCB redesign to accommodate the 16-SOIC surface-mount package instead of the 16-DIP through-hole package. Pin-to-pin electrical functionality is identical.

Q: What is the primary difference between these two parts?

A: The INA125PA uses through-hole DIP packaging for manual or wave-soldering assembly, while INA125UA/2K5 uses surface-mount SOIC packaging for automated SMT assembly. All electrical specifications are identical.

Q: Why is INA125PA marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this part number. Existing inventory will be depleted without replenishment. New designs should transition to INA125UA/2K5 for long-term availability.

Q: Are there any thermal or reliability differences between the packages?

A: The provided specifications do not include thermal performance data or reliability metrics. Package selection should be based on assembly process capability and PCB design requirements.

Q: What is the moisture sensitivity level difference?

A: INA125PA lists MSL as Not Applicable (through-hole package). INA125UA/2K5 specifies MSL 3 (168 Hours), which is standard for surface-mount components and requires controlled storage and handling procedures during assembly.

Q: Can both parts be used interchangeably in the same circuit?

A: Electrically, yes. Physically, no. Circuit board layout and assembly process must be compatible with the selected package type. Schematic-level substitution is valid; board-level substitution requires design modification.

Q: What inventory considerations should guide part selection?

A: INA125PA has 3400 units in stock but Last Time Buy status. INA125UA/2K5 has 1994 units in stock with Active status. For new production programs, INA125UA/2K5 is recommended to ensure supply continuity beyond current inventory depletion.