LM725CN/NOPB Equivalent & Substitute Parts

Part Overview

The LM725CN/NOPB is a general purpose operational amplifier manufactured by Texas Instruments, housed in an 8-DIP through-hole package. This device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The LM725CN/NOPB operates across a wide supply voltage range of 6V to 44V and is suitable for applications requiring general purpose amplification in industrial and consumer electronics.

Substiute Parts

LM725CN/NOPB

Texas InstrumentsIn Stock: 694LM725CN/NOPB Datasheet

Current PartRFQ

AMP03GPZ

Analog Devices Inc.In Stock: 1399AMP03GPZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM725CN/NOPB is determined by compatibility across the following critical parameters:

Package and Mounting Compatibility: Both the main part and substitute must use 8-DIP through-hole packaging to ensure direct board-level compatibility without layout modifications.

Supply Voltage Range: The substitute must operate within or encompass the supply voltage requirements of the application. The LM725CN/NOPB operates from 6V to 44V; substitutes must support this range or a compatible subset.

Functional Classification: The LM725CN/NOPB is a general purpose amplifier with single-circuit configuration. Substitutes must provide equivalent amplification functionality in a single-circuit topology.

Electrical Performance Envelope: Key performance metrics including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current define the operational characteristics. Substitutes must meet or exceed these specifications to ensure functional equivalence.

Compliance and Certification: RoHS3 compliance and REACH unaffected status are mandatory for modern production environments.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM725CN/NOPB is classified as obsolete. The AMP03GPZ is an active product from Analog Devices Inc., ensuring ongoing availability and manufacturing support for new designs and production continuity.

Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying modern regulatory requirements for electronic component procurement and assembly.

Package Compatibility: Both devices utilize identical 8-DIP through-hole packaging, enabling direct substitution without printed circuit board redesign or layout modification.

Performance Characteristics: The AMP03GPZ demonstrates superior electrical performance across multiple parameters. The slew rate of 9.5V/µs exceeds the LM725CN/NOPB specification by a factor of 47.5, and input offset voltage is reduced from 500µV to 25µV. These improvements provide enhanced signal fidelity and reduced DC error in amplification circuits.

Supply Voltage Consideration: The AMP03GPZ operates from 12V to 36V, which represents a narrower range than the LM725CN/NOPB (6V to 44V). Applications requiring operation below 12V or above 36V cannot use this substitute without circuit modification.

Temperature Range: The AMP03GPZ supports an extended operating temperature range of -40°C to 85°C compared to 0°C to 70°C for the LM725CN/NOPB, providing greater thermal flexibility for industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the AMP03GPZ be used as a direct replacement for the LM725CN/NOPB in all applications?

A: Direct substitution is possible only when the application supply voltage operates within the 12V to 36V range. Applications requiring operation below 12V or above 36V require circuit redesign or alternative component selection.

Q: What are the primary differences between these two amplifiers?

A: The AMP03GPZ is a differential amplifier with active product status, while the LM725CN/NOPB is a general purpose amplifier that is obsolete. The AMP03GPZ provides significantly faster slew rate (9.5V/µs vs. 0.2V/µs), lower input offset voltage (25µV vs. 500µV), and extended temperature range (-40°C to 85°C vs. 0°C to 70°C). The supply voltage range is narrower for the AMP03GPZ.

Q: Are there any pin-compatibility concerns between these devices?

A: Both devices use 8-DIP through-hole packaging with identical physical dimensions (0.300", 7.62mm). Pin-level compatibility must be verified against the specific application schematic and functional requirements.

Q: What is the impact of increased supply current in the AMP03GPZ?

A: The AMP03GPZ draws 2.5mA compared to 1mA for the LM725CN/NOPB. This 2.5x increase in supply current must be evaluated against power supply capacity and thermal management requirements in the target application.

Q: Is the AMP03GPZ suitable for low-voltage applications below 12V?

A: No. The AMP03GPZ minimum supply voltage is 12V. Applications requiring operation below 12V must retain the LM725CN/NOPB or identify alternative components with lower minimum supply voltage specifications.

Q: How does the narrower supply voltage range of the AMP03GPZ affect system design?

A: The AMP03GPZ operates from 12V to 36V, compared to 6V to 44V for the LM725CN/NOPB. System designs must ensure that supply voltage remains within this narrower window. Applications using the full 6V to 44V range of the original part cannot migrate to the AMP03GPZ without power supply modification.