LM2904WN Equivalent & Substitute Parts

Part Overview

The LM2904WN is a general-purpose operational amplifier featuring two independent circuits in a single 8-Mini DIP package. Manufactured by STMicroelectronics, this device is designed for applications requiring dual-channel amplification with single-ended output configuration. The LM2904WN is classified as obsolete, necessitating identification of active substitute components that maintain functional and electrical compatibility for ongoing production and maintenance applications.

Substiute Parts

LM2904WN

STMicroelectronicsIn Stock: 836LM2904WN Datasheet

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LM2904N/NOPB

Texas InstrumentsIn Stock: 2908LM2904N/NOPB Datasheet

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NJM3404AD

Nisshinbo Micro Devices Inc.In Stock: 6109NJM3404AD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2904WN is determined by strict alignment across the following critical parameters:

Functional Requirements:

• Dual-channel general-purpose operational amplifier configuration
• Single-ended output topology
• 8-DIP through-hole package format (0.300", 7.62mm)

Electrical Compatibility Criteria:

• Gain bandwidth product within the 1.0–1.2 MHz range
• Input offset voltage of 2 mV
• Output current capability of 30–40 mA per channel
• Supply voltage span encompassing minimum 3 V and maximum 30 V operation
• Input bias current specifications compatible with the application circuit

Compliance & Certification:

• RoHS3 compliance for environmental standards
• REACH unaffected status for regulatory alignment
• Moisture sensitivity level appropriate for storage and handling

The substitute parts identified—LM2904N/NOPB (Texas Instruments) and NJM3404AD (Nisshinbo Micro Devices Inc.)—satisfy these substitution criteria while maintaining active product status and full availability.

Parameter Comparison

Engineering Selection Recommendations

LM2904N/NOPB (Texas Instruments)

This substitute maintains active product status and ROHS3 compliance. The device operates within the specified supply voltage range (3–32 V) and delivers equivalent output current capability (40 mA per channel). The gain bandwidth product of 1.0 MHz aligns with the LM2904WN specification. Input bias current is elevated at 45 nA compared to the original 20 nA; however, this remains within acceptable tolerances for general-purpose amplifier applications. The operating temperature range extends to 85°C, which is lower than the original 125°C maximum. This substitute is suitable for applications where the reduced upper temperature limit does not constrain system operation.

NJM3404AD (Nisshinbo Micro Devices Inc.)

This substitute provides active product status with RoHS compliance and extended supply voltage capability (4–36 V). The gain bandwidth product of 1.2 MHz exceeds the original specification, providing enhanced frequency response. Input bias current is 70 nA, representing a significant increase from the original 20 nA specification. Supply current consumption is elevated at 2 mA versus the original 700 µA. Output current per channel is reduced to 30 mA compared to the original 40 mA. The operating temperature range is limited to 85°C. This substitute is applicable in applications where higher frequency response is beneficial and where the increased supply current and reduced output current do not present design constraints.

Both substitutes maintain the critical dual-channel configuration, single-ended output topology, and 8-DIP package format required for direct replacement in existing circuit board layouts.

Frequently Asked Questions (FAQ)

Q: Can the LM2904N/NOPB directly replace the LM2904WN in all applications?

A: The LM2904N/NOPB maintains functional and electrical compatibility for most general-purpose amplifier applications. The primary consideration is the reduced maximum operating temperature of 85°C versus the original 125°C. Applications operating within the -40°C to 85°C range experience no thermal limitations. The elevated input bias current (45 nA versus 20 nA) requires circuit verification in applications with high-impedance input sources.

Q: What are the key differences between the LM2904N/NOPB and NJM3404AD substitutes?

A: The LM2904N/NOPB maintains lower supply current consumption (1 mA versus 2 mA) and higher output current capability (40 mA versus 30 mA per channel). The NJM3404AD provides higher gain bandwidth product (1.2 MHz versus 1.0 MHz) and extended maximum supply voltage (36 V versus 32 V). Input bias current is lower in the LM2904N/NOPB (45 nA versus 70 nA). Both devices operate to 85°C maximum temperature.

Q: Is the 8-DIP package format identical across all three devices?

A: Yes. The LM2904WN, LM2904N/NOPB, and NJM3404AD all utilize the 8-DIP (0.300", 7.62mm) through-hole package format. Direct mechanical substitution on existing printed circuit boards is supported without layout modification.

Q: How does the input bias current difference affect circuit design?

A: The LM2904WN specifies 20 nA input bias current. The LM2904N/NOPB increases this to 45 nA, and the NJM3404AD to 70 nA. In circuits with high-impedance input networks (>1 MΩ), the increased bias current may introduce measurable input offset voltage errors. Low-impedance circuits (<100 kΩ) experience negligible impact. Input bias current compensation techniques remain applicable across all three devices.

Q: What is the significance of the operating temperature range difference?

A: The LM2904WN operates to 125°C maximum; both substitutes limit operation to 85°C. Applications requiring continuous operation above 85°C must retain the original LM2904WN or identify alternative components with extended temperature ratings. Applications within the -40°C to 85°C range experience no functional limitation with either substitute.

Q: Are all three devices RoHS compliant?

A: Yes. The LM2904WN and LM2904N/NOPB are ROHS3 compliant. The NJM3404AD is RoHS compliant. All three devices maintain REACH unaffected status and are suitable for applications requiring environmental compliance certification.

Q: Which substitute should be selected for new designs?

A: Selection depends on specific application requirements. For applications prioritizing low supply current consumption and maximum output current, the LM2904N/NOPB is appropriate. For applications benefiting from higher gain bandwidth product and extended supply voltage range, the NJM3404AD is suitable. Both devices maintain active product status and full availability, supporting long-term supply chain stability.