INA122P Equivalent & Substitute Parts

Part Overview

The INA122P 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 INA122P is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

INA122P

Texas InstrumentsIn Stock: 4209INA122P Datasheet

Current PartRFQ

INA122U/2K5

Texas InstrumentsIn Stock: 3796INA122U/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 INA122P is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Amplifier Type: Instrumentation (single circuit)
• Supply Voltage Range: 2.2 V to 36 V minimum
• Operating Temperature Range: -40°C to 85°C minimum
• Output Type compatibility (standard or rail-to-rail)
• Slew Rate and Bandwidth performance envelope

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole (for direct PCB replacement)
• Package / Case: 8-DIP form factor (0.300", 7.62mm)
• Pin configuration compatibility

Compliance Criteria:

• RoHS3 Compliance
• REACH Unaffected status

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Through-Hole Substitutes Parts maintaining identical 8-DIP through-hole packaging with equivalent or superior electrical performance.

Category 2: Functional Equivalents (Surface Mount Alternative) Parts with identical electrical specifications but different packaging (8-SOIC surface mount), requiring PCB redesign.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through-Hole PCB Replacement (No Layout Changes):

AD627BNZ and AD627ANZ are the primary substitutes for INA122P. Both devices maintain the 8-DIP through-hole package and identical supply voltage range. These Analog Devices parts are in Active product status, ensuring long-term availability. Both offer improved input bias current (2 nA versus 10 nA) and lower input offset voltage compared to the INA122P. The trade-off is reduced slew rate (0.06 V/µs versus 0.16 V/µs) and lower bandwidth (80 kHz versus 120 kHz). Selection between AD627BNZ and AD627ANZ depends on input offset voltage requirements: AD627BNZ specifies 25 µV maximum, while AD627ANZ specifies 50 µV maximum.

For Surface Mount Applications (PCB Redesign Required):

INA122U/2K5 is a Texas Instruments equivalent maintaining identical electrical performance to INA122P but in 8-SOIC surface mount packaging. This part is suitable for new designs or PCB revisions where surface mount technology is preferred. The INA122U/2K5 is in Active product status with higher MSL rating (3, 168 hours) requiring controlled moisture exposure during storage and assembly.

Compliance and Availability:

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. AD627BNZ and AD627ANZ carry MSL rating 1 (unlimited moisture sensitivity), providing superior handling flexibility compared to INA122U/2K5 (MSL 3).

Frequently Asked Questions (FAQ)

Q: Can AD627BNZ or AD627ANZ be used as direct replacements for INA122P without PCB modifications?

A: Yes. Both AD627BNZ and AD627ANZ maintain identical 8-DIP through-hole packaging and pin configuration. No PCB layout changes are required. However, verify that the reduced slew rate (0.06 V/µs versus 0.16 V/µs) and lower bandwidth (80 kHz versus 120 kHz) are acceptable for your application's signal conditioning requirements.

Q: What is the difference between AD627BNZ and AD627ANZ?

A: Both parts are functionally equivalent with identical electrical performance except for input offset voltage specification. AD627BNZ specifies maximum 25 µV input offset voltage, while AD627ANZ specifies maximum 50 µV. Select AD627BNZ for applications requiring tighter input offset voltage tolerance.

Q: Is INA122U/2K5 a suitable replacement for INA122P?

A: INA122U/2K5 is electrically equivalent to INA122P with identical slew rate, bandwidth, and output current specifications. However, it uses 8-SOIC surface mount packaging instead of 8-DIP through-hole packaging. This substitute requires PCB redesign and is suitable only for new production or board revisions. The higher MSL rating (3 versus not applicable) requires controlled moisture handling during storage and assembly.

Q: What are the key electrical differences between INA122P and the AD627 series?

A: The primary differences are slew rate and bandwidth. INA122P offers 0.16 V/µs slew rate and 120 kHz bandwidth, while AD627 series offers 0.06 V/µs slew rate and 80 kHz bandwidth. AD627 series provides superior input bias current (2 nA versus 10 nA) and lower input offset voltage. Supply voltage range, operating temperature, and supply current are identical across all parts.

Q: Are all substitute parts available in the same packaging options?

A: No. AD627BNZ and AD627ANZ are available only in 8-DIP through-hole packaging (Tube). INA122U/2K5 is available in 8-SOIC surface mount packaging (Tape & Reel). INA122P was available in 8-DIP through-hole packaging (Tube) but is now Last Time Buy status.

Q: What is the MSL rating and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates how sensitive a component is to moisture absorption during storage and assembly. AD627BNZ and AD627ANZ carry MSL 1 (unlimited), meaning no moisture precautions are required. INA122U/2K5 carries MSL 3 (168 hours), requiring that the component be used within 168 hours of opening the moisture barrier bag. For through-hole assembly, MSL rating is less critical than for surface mount processes.

Q: Can I use multiple AD627 devices to replace a multi-circuit amplifier?

A: The INA122P contains one instrumentation amplifier circuit. AD627BNZ and AD627ANZ also contain one circuit each. If your application requires multiple amplifier circuits, select parts with matching circuit count or use multiple single-circuit devices as required by your design.