LM2904N Equivalent & Substitute Parts

Part Overview

The LM2904N is a general-purpose operational amplifier featuring dual circuits in an 8-PDIP through-hole package. Manufactured by Texas Instruments, this device is classified as obsolete product status. The LM2904N operates across a wide supply voltage range of 3V to 32V and is suitable for applications requiring low input bias current and moderate bandwidth performance. Due to its obsolete classification, identifying compatible substitute parts is essential for design continuity and procurement planning.

Substiute Parts

LM2904N

Texas InstrumentsIn Stock: 3025LM2904N Datasheet

Current PartRFQ

LM2904N/NOPB

Texas InstrumentsIn Stock: 2908LM2904N/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the LM2904N is determined by the following critical parameters:

Mechanical Compatibility: Package type (8-DIP), mounting method (through hole), and physical dimensions (0.300", 7.62mm) must remain identical to ensure direct board-level replacement without layout modifications.

Electrical Compatibility: The substitute must maintain the same number of circuits (2), operate within the specified supply voltage range (3V to 32V minimum and maximum), and support the operating temperature range (-40°C to 85°C).

Functional Parameters: Input bias current (45 nA), input offset voltage (2 mV), supply current (1 mA), and output current per channel (30 mA or greater) establish the baseline performance envelope.

Regulatory Compliance: While the original LM2904N is RoHS non-compliant, substitute parts may offer improved compliance status without affecting core functionality.

The LM2904N/NOPB qualifies as a direct substitute based on identical mechanical packaging, matching electrical specifications, and equivalent functional performance within the defined parameter set.

Parameter Comparison

Engineering Selection Recommendations

The LM2904N/NOPB is the appropriate substitute for the obsolete LM2904N based on the following engineering criteria:

Product Status Alignment: The LM2904N/NOPB maintains active product status with Texas Instruments, ensuring continued availability and supply chain reliability compared to the obsolete LM2904N classification.

Regulatory Compliance Enhancement: The LM2904N/NOPB achieves ROHS3 compliance, providing improved environmental and regulatory standing for new designs and procurement cycles, while the original LM2904N is RoHS non-compliant.

Electrical Performance: The substitute part exceeds the original specifications in gain bandwidth product (1 MHz versus 700 kHz) and output current per channel (40 mA versus 30 mA), delivering enhanced performance margins without compromising compatibility.

Mechanical and Functional Equivalence: Both parts share identical package geometry (8-DIP, 0.300" spacing), mounting method (through hole), circuit count (2), and core electrical parameters (input bias current, input offset voltage, supply current, and operating temperature range).

Packaging Variant: The LM2904N/NOPB is supplied in tube packaging, which is standard for active production parts and supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the LM2904N/NOPB be used as a direct replacement for the LM2904N on existing PCBs?

A: Yes. Both parts use identical 8-DIP through-hole packaging with 0.300" (7.62mm) lead spacing. No PCB layout modifications are required for direct substitution.

Q: What is the significance of the "/NOPB" suffix in the LM2904N/NOPB part number?

A: The "/NOPB" designation indicates the part is supplied in tube packaging without plumbum (lead-free). This is the standard production variant for active parts from Texas Instruments.

Q: Are there any electrical performance differences between LM2904N and LM2904N/NOPB?

A: The LM2904N/NOPB provides higher gain bandwidth product (1 MHz versus 700 kHz) and greater output current per channel (40 mA versus 30 mA). These enhancements are backward compatible and do not affect circuit operation in applications designed for the original LM2904N.

Q: Why is the LM2904N classified as obsolete?

A: The LM2904N has been superseded by the LM2904N/NOPB in Texas Instruments' active product portfolio. The newer variant offers improved compliance status and performance characteristics while maintaining full functional compatibility.

Q: Does the LM2904N/NOPB meet RoHS requirements?

A: Yes. The LM2904N/NOPB is ROHS3 compliant, whereas the original LM2904N is RoHS non-compliant. This makes the substitute suitable for applications with RoHS regulatory requirements.

Q: What is the operating temperature range for both parts?

A: Both the LM2904N and LM2904N/NOPB operate across -40°C to 85°C, supporting industrial and commercial temperature specifications.

Q: Are moisture sensitivity considerations different between these parts?

A: No. Both parts have identical Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Can the LM2904N/NOPB be used in designs originally specified for the LM2904N without circuit redesign?

A: Yes. The electrical parameters, supply voltage range (3V to 32V), and functional characteristics are compatible. The enhanced performance specifications of the substitute part do not require circuit modifications.