LT1127CJ Equivalent & Substitute Parts

Part Overview

The LT1127CJ is a general-purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a quad amplifier (4 circuits) in a 14-CERDIP package. This device is classified as obsolete, indicating it is no longer in active production. The LT1127CJ operates across a wide supply voltage range of 8V to 36V and is designed for through-hole mounting applications. Due to its obsolete status, identifying equivalent and substitute parts is necessary for system redesign, component sourcing, and long-term product support.

Substiute Parts

LT1127CJ

Analog Devices Inc.In Stock: 1249LT1127CJ Datasheet

Current PartRFQ

JM38510/11001SCA

Texas InstrumentsIn Stock: 1048JM38510/11001SCA Datasheet

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LM148J/PB

Texas InstrumentsIn Stock: 986LM148J/PB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT1127CJ is determined by the following critical parameters that must align with the original device specifications:

Primary Substitution Criteria:

• Number of circuits: 4 (quad configuration required)
• Package type: 14-CDIP through-hole mounting
• Amplifier classification: General Purpose
• Supply voltage compatibility: Minimum 8V to maximum 36V operating range
• Mounting technology: Through-hole only

Secondary Performance Considerations:

• Slew rate: 11 V/µs (original specification)
• Gain bandwidth product: 65 MHz (original specification)
• Input bias current: 8 nA (original specification)
• Input offset voltage: 25 µV (original specification)
• Supply current: 2.6 mA per 4 channels (original specification)

Substitute parts must maintain compatibility with the 14-CDIP package footprint and through-hole mounting requirements. Deviations in electrical performance parameters indicate functional differences that affect circuit behavior and application suitability.

Parameter Comparison

Engineering Selection Recommendations

LM148J/PB (Texas Instruments)

The LM148J/PB is an active product in the general-purpose quad amplifier category with identical package and mounting specifications to the LT1127CJ. This device is ROHS3 compliant and offers extended operating temperature range (-55°C to 125°C). The LM148J/PB exhibits reduced slew rate (0.5 V/µs versus 11 V/µs) and lower gain bandwidth product (1 MHz versus 65 MHz), indicating slower transient response and narrower frequency response. Input bias current is higher at 30 nA compared to 8 nA, and input offset voltage is 1 mV versus 25 µV. Supply voltage minimum is 10V, which is higher than the LT1127CJ minimum of 8V. The LM148J/PB is suitable for applications where the reduced performance specifications are acceptable and where active product status and RoHS compliance are required.

JM38510/11001SCA (Texas Instruments)

The JM38510/11001SCA is a space-grade, active product quad amplifier with identical 14-CDIP package configuration. This device features push-pull output configuration and is ROHS3 compliant. The JM38510/11001SCA exhibits significantly reduced slew rate (0.2 V/µs) and gain bandwidth product (1 MHz), with substantially higher input bias current (100 nA) and input offset voltage (5 mV). Supply voltage minimum is 10V. This device is intended for aerospace and high-reliability applications where space-grade qualification is required. Performance specifications differ substantially from the LT1127CJ, limiting direct functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the LM148J/PB directly replace the LT1127CJ in existing circuit designs?

A: The LM148J/PB shares identical package, mounting type, and quad amplifier configuration with the LT1127CJ. However, electrical performance differs significantly. The LM148J/PB has lower slew rate (0.5 V/µs versus 11 V/µs), lower gain bandwidth product (1 MHz versus 65 MHz), higher input bias current (30 nA versus 8 nA), and higher input offset voltage (1 mV versus 25 µV). Direct substitution is possible only in applications where these performance reductions do not affect circuit function. Circuit redesign or performance verification is necessary for applications sensitive to frequency response, transient response, or input offset characteristics.

Q: What is the minimum supply voltage requirement for substitute parts?

A: The LT1127CJ operates with a minimum supply voltage of 8V. Both substitute parts (LM148J/PB and JM38510/11001SCA) require a minimum supply voltage of 10V. Systems designed for 8V to 10V operation must be evaluated for compatibility with substitute parts.

Q: Are the substitute parts available in the same package configuration?

A: Yes. Both the LM148J/PB and JM38510/11001SCA are available in 14-CDIP (0.300", 7.62mm) through-hole packages, identical to the LT1127CJ. Pin-to-pin compatibility is maintained for PCB mounting.

Q: What is the difference between the two substitute parts?

A: The LM148J/PB is a standard general-purpose quad amplifier with active product status and RoHS3 compliance. The JM38510/11001SCA is a space-grade variant with push-pull output configuration, designed for aerospace and high-reliability applications. The JM38510/11001SCA exhibits lower electrical performance specifications than the LM148J/PB.

Q: Does the LT1127CJ have RoHS compliance certification?

A: RoHS status is not specified for the LT1127CJ. Both substitute parts (LM148J/PB and JM38510/11001SCA) are ROHS3 compliant.

Q: What is the operating temperature range difference between the LT1127CJ and substitute parts?

A: The LT1127CJ operates from -40°C to 85°C. Both substitute parts operate from -55°C to 125°C, providing extended temperature range capability.

Q: Is the LT1127CJ still available for purchase?

A: The LT1127CJ is classified as obsolete and no longer in active production. Substitute parts with active product status are recommended for new designs and long-term availability assurance.