LT1122CCJ8 Equivalent & Substitute Parts

Part Overview

The LT1122CCJ8 is a J-FET input operational amplifier manufactured by Analog Devices Inc., housed in an 8-CERDIP package for through-hole mounting. This device is classified as obsolete, necessitating identification of active equivalent parts for new designs and production continuity. The LT1122CCJ8 delivers high-speed amplification with a 75V/µs slew rate and 13 MHz gain bandwidth product, suitable for precision signal conditioning applications requiring low input bias current and low input offset voltage.

Substiute Parts

LT1122CCJ8

Analog Devices Inc.In Stock: 1194LT1122CCJ8 Datasheet

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OP42FZ

Analog Devices Inc.In Stock: 3341OP42FZ Datasheet

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TLE2071AMJGB

Texas InstrumentsIn Stock: 1201TLE2071AMJGB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT1122CCJ8 is determined by compatibility across the following critical parameters: package type (8-CDIP through-hole), number of circuits (single), mounting configuration, and electrical performance envelope. The substitute parts identified maintain the same physical footprint and pin configuration, enabling direct replacement in existing PCB layouts.

The OP42FZ maintains J-FET amplifier topology with identical packaging, though with reduced slew rate (50V/µs versus 75V/µs) and lower gain bandwidth product (10 MHz versus 13 MHz). The TLE2071AMJGB employs standard amplifier topology with push-pull output configuration, offering extended operating temperature range and lower supply voltage minimum, but differs in amplifier type classification.

Substitution eligibility is based on: (1) identical package and mounting type, (2) compatible pin count and configuration, (3) electrical specifications within application tolerance, and (4) product status (active versus obsolete).

Parameter Comparison

Engineering Selection Recommendations

OP42FZ is the primary substitute for direct J-FET amplifier replacement. Both the LT1122CCJ8 and OP42FZ are manufactured by Analog Devices Inc. and employ identical J-FET input topology. The OP42FZ is currently in active production status, ensuring long-term availability. The OP42FZ exhibits lower slew rate and gain bandwidth product compared to the original part; applications requiring the full 75V/µs slew rate or 13 MHz bandwidth must evaluate performance impact. The OP42FZ is ROHS3 compliant and REACH unaffected, meeting modern environmental standards.

TLE2071AMJGB serves as an alternative substitute when extended operating temperature range (-55°C to 125°C) or lower minimum supply voltage (4.5V) is required. This Texas Instruments device employs standard amplifier topology with push-pull output configuration, differing from the J-FET input type of the original part. The TLE2071AMJGB demonstrates lower supply current (1.7mA) and higher output current capability (48mA per channel). This part is military-grade rated, ROHS3 compliant, and REACH unaffected. The TLE2071AMJGB is suitable for applications where amplifier topology flexibility and extended environmental specifications outweigh J-FET input characteristics.

Both substitute parts maintain identical 8-CDIP package configuration and through-hole mounting, enabling direct PCB footprint compatibility with the obsolete LT1122CCJ8.

Frequently Asked Questions (FAQ)

Q: Can the OP42FZ directly replace the LT1122CCJ8 in existing designs?

A: The OP42FZ shares identical package, pin configuration, and J-FET amplifier topology with the LT1122CCJ8. Direct PCB replacement is physically feasible. However, the OP42FZ exhibits reduced slew rate (50V/µs versus 75V/µs) and lower gain bandwidth product (10 MHz versus 13 MHz). Circuit performance must be evaluated against application requirements for transient response and frequency response specifications.

Q: What are the key differences between the OP42FZ and TLE2071AMJGB substitutes?

A: The OP42FZ maintains J-FET input amplifier topology identical to the original LT1122CCJ8, while the TLE2071AMJGB employs standard amplifier topology with push-pull output. The TLE2071AMJGB offers extended operating temperature range (-55°C to 125°C versus -25°C to 85°C for OP42FZ) and lower minimum supply voltage (4.5V versus 16V for OP42FZ). The OP42FZ provides lower input bias current (130pA versus 20pA) and lower input offset voltage (400µV versus 470µV) compared to the TLE2071AMJGB.

Q: Are both substitute parts available in the same package as the LT1122CCJ8?

A: Both the OP42FZ and TLE2071AMJGB are packaged in 8-CDIP (0.300", 7.62mm) through-hole configuration, identical to the LT1122CCJ8. Pin-for-pin compatibility is maintained for direct PCB replacement without layout modification.

Q: Which substitute part is recommended for new designs?

A: Selection depends on application requirements. For applications requiring J-FET input characteristics and performance similar to the original LT1122CCJ8, the OP42FZ is the primary choice. For applications requiring extended temperature range, lower supply voltage operation, or higher output current capability, the TLE2071AMJGB is appropriate. Both parts are in active production status with established supply chains.

Q: What compliance certifications do the substitute parts carry?

A: Both the OP42FZ and TLE2071AMJGB are ROHS3 compliant and REACH unaffected. The TLE2071AMJGB carries military-grade qualification. The LT1122CCJ8 compliance status is not specified in available documentation.

Q: How do the supply voltage ranges compare between the three parts?

A: The LT1122CCJ8 operates from 10V to 36V. The OP42FZ requires 16V to 40V minimum and maximum supply voltage. The TLE2071AMJGB operates from 4.5V to 38V, offering the widest supply voltage range and lowest minimum voltage requirement. Applications with constrained supply voltage must select accordingly.