INA122PA Equivalent & Substitute Parts

Part Overview

The INA122PA is a single-circuit instrumentation amplifier manufactured by Texas Instruments in 8-PDIP through-hole packaging. This device operates across a wide supply voltage range of 2.2 V to 36 V with an operating temperature range of -40°C to 85°C. The INA122PA is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for new production and field replacements.

Substiute Parts

INA122PA

Texas InstrumentsIn Stock: 4050INA122PA Datasheet

Current PartRFQ

INA122UA/2K5

Texas InstrumentsIn Stock: 17694INA122UA/2K5 Datasheet

MFR RecommendedRFQ

AD627ANZ

Analog Devices Inc.In Stock: 1267AD627ANZ Datasheet

MFR RecommendedRFQ

AD627BNZ

Analog Devices Inc.In Stock: 1414AD627BNZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA122PA is determined by functional equivalence across the following critical parameters: amplifier type (instrumentation), number of circuits (1), supply voltage range (2.2 V to 36 V), operating temperature range (-40°C to 85°C), and package compatibility.

The substitute parts are grouped into two categories:

Category 1: Same Package, Same Manufacturer (Texas Instruments) The INA122UA/2K5 is a direct functional equivalent with identical electrical specifications. The primary difference is packaging format: surface-mount 8-SOIC instead of through-hole 8-DIP. This substitution requires PCB redesign for surface-mount assembly.

Category 2: Same Package, Alternative Manufacturer (Analog Devices Inc.) The AD627ANZ and AD627BNZ are instrumentation amplifiers in 8-PDIP through-hole packaging from Analog Devices Inc. Both maintain the same supply voltage range, operating temperature, and mounting type as the INA122PA. These parts are functionally compatible for through-hole applications without PCB modification.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole PCB Designs (No Redesign Required)

The AD627ANZ and AD627BNZ are direct pin-compatible substitutes for the INA122PA in through-hole applications. Both parts maintain identical mounting type, package dimensions, supply voltage range, and operating temperature specifications. Selection between these two Analog Devices options depends on input offset voltage requirements: AD627BNZ offers superior offset voltage performance (25 µV) compared to AD627ANZ (50 µV). Both parts are ROHS3 compliant and carry Active product status, ensuring long-term availability.

For Surface-Mount PCB Designs (Redesign Required)

The INA122UA/2K5 is a Texas Instruments equivalent with identical electrical performance to the INA122PA. This part requires PCB layout modification due to 8-SOIC surface-mount packaging. The INA122UA/2K5 maintains ROHS3 compliance and Active product status.

Compliance and Availability Considerations

All substitute parts are ROHS3 compliant and REACH unaffected. The INA122PA is designated Last Time Buy; therefore, transition to an Active product status part is recommended for new designs. The AD627ANZ and AD627BNZ carry MSL rating 1 (Unlimited), indicating superior moisture handling compared to the INA122UA/2K5 (MSL rating 3, 168 hours).

Frequently Asked Questions (FAQ)

Q: Can the AD627ANZ or AD627BNZ be used as direct replacements for the INA122PA without PCB modification?

A: Yes. Both AD627ANZ and AD627BNZ are pin-compatible with the INA122PA in 8-DIP through-hole packaging. No PCB layout changes are required. Electrical performance is compatible across the specified operating range.

Q: What are the key electrical differences between the INA122PA and the AD627 series?

A: The AD627ANZ and AD627BNZ feature lower input bias current (2 nA vs. 10 nA), lower input offset voltage (50 µV and 25 µV respectively vs. 150 µV), and rail-to-rail output capability. Slew rate and bandwidth are lower (0.06 V/µs and 80 kHz vs. 0.16 V/µs and 120 kHz). Output current is reduced (25 mA vs. 30 mA). These differences must be evaluated against application requirements.

Q: Is the INA122UA/2K5 suitable for existing through-hole designs?

A: No. The INA122UA/2K5 uses 8-SOIC surface-mount packaging, which is incompatible with through-hole PCB designs. PCB redesign is required for this substitution.

Q: What is the significance of the Last Time Buy status for the INA122PA?

A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Existing inventory will be depleted. For long-term product support, transition to an Active product status part such as AD627ANZ, AD627BNZ, or INA122UA/2K5 is necessary.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The INA122PA, INA122UA/2K5, AD627ANZ, and AD627BNZ are all ROHS3 compliant and REACH unaffected.

Q: Which substitute part offers the best input offset voltage performance?

A: The AD627BNZ provides the lowest input offset voltage at 25 µV, compared to 50 µV for the AD627ANZ and 150 µV for the INA122PA.

Q: What is the moisture sensitivity level (MSL) difference between substitute parts?

A: The AD627ANZ and AD627BNZ carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions. The INA122UA/2K5 carries MSL rating 3 (168 hours), requiring controlled storage and handling conditions. The original INA122PA has MSL rating Not Applicable.