LM2902NE4 Equivalent & Substitute Parts

Part Overview

The LM2902NE4 is a quad general-purpose operational amplifier manufactured by Texas Instruments, designed for applications requiring four independent amplifier circuits in a single 14-pin DIP package. This device operates across a wide supply voltage range of 3 V to 26 V and is suitable for push-pull output configurations with a gain-bandwidth product of 1 MHz.

The LM2902NE4 is currently designated as Last Time Buy, indicating that Texas Instruments has discontinued or will discontinue production. This status necessitates identification of equivalent substitute components to maintain design continuity and ensure long-term component availability for production and field support.

Substiute Parts

LM2902NE4

Texas InstrumentsIn Stock: 953LM2902NE4 Datasheet

Current PartRFQ

LM324N

IntersilIn Stock: 324627LM324N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2902NE4 is determined by the following critical parameters that must remain consistent across equivalent components:

Functional Parameters:

• Quad operational amplifier configuration (4 independent circuits)
• General-purpose amplifier classification
• Push-pull output capability
• Gain-bandwidth product of 1 MHz
• Input bias current specification of 40 nA or lower
• Input offset voltage of 2 mV or lower
• Output current per channel of 40 mA or higher

Electrical Parameters:

• Supply current of 1.5 mA or lower
• Minimum supply voltage of 3 V or lower
• Maximum supply voltage of 26 V or higher
• Operating temperature range encompassing −40°C to 85°C

Physical Parameters:

• 14-pin DIP package with 0.300" (7.62 mm) pitch
• Through-hole mounting configuration

The LM324N from Intersil meets the functional and electrical requirements for substitution, with the exception of operating temperature range and RoHS compliance status, which represent design trade-offs in component selection.

Parameter Comparison

Engineering Selection Recommendations

LM2902NE4 (Primary Component): The LM2902NE4 is the original design component and remains the preferred choice where available. It is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The extended operating temperature range of −40°C to 85°C supports applications requiring full industrial temperature performance. Current inventory status indicates 873 pieces available as new original stock.

LM324N (Substitute Component): The LM324N from Intersil is electrically compatible with the LM2902NE4 for most general-purpose amplifier applications. The device maintains identical pin configuration, package dimensions, and core electrical specifications including supply current, output current, and input offset voltage. The maximum supply voltage rating of 32 V exceeds the LM2902NE4 specification, providing additional design margin.

Substitution Constraints:

The LM324N operates within a reduced temperature range of 0°C to 70°C, which excludes applications requiring operation below 0°C or above 70°C. This limitation must be evaluated against specific application requirements.

The LM324N is designated as obsolete and is not RoHS compliant, whereas the LM2902NE4 is RoHS3 compliant. Organizations subject to RoHS requirements or environmental compliance mandates must account for this difference in component selection and supply chain planning.

The input bias current of the LM324N is 45 nA, which is 5 nA higher than the LM2902NE4 specification of 40 nA. This difference is negligible for most applications but must be evaluated in precision analog circuits where input bias current drift or matching is critical.

Frequently Asked Questions (FAQ)

Q: Can the LM324N be used as a direct replacement for the LM2902NE4 in all applications?

A: The LM324N is electrically compatible for applications operating within the temperature range of 0°C to 70°C. Applications requiring operation below 0°C or above 70°C require the LM2902NE4 or an alternative component with an extended temperature rating. Additionally, RoHS compliance requirements must be evaluated based on end-use regulations and customer specifications.

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

A: The LM2902NE4 operates from −40°C to 85°C, while the LM324N operates from 0°C to 70°C. This 40°C difference at the lower end and 15°C difference at the upper end affects component suitability for automotive, industrial, and military applications where extended temperature performance is required. Applications limited to commercial temperature ranges (0°C to 70°C) are unaffected by this difference.

Q: Are the pin configurations identical between these devices?

A: Yes. Both the LM2902NE4 and LM324N use the 14-pin DIP package with 0.300" (7.62 mm) pitch. Pin-to-pin compatibility is confirmed, allowing direct socket substitution without PCB redesign.

Q: What is the impact of the 5 nA difference in input bias current?

A: The LM324N input bias current of 45 nA is 5 nA higher than the LM2902NE4 specification of 40 nA. For most general-purpose amplifier applications, this difference is negligible. However, in precision instrumentation circuits, transimpedance amplifiers, or applications with high-impedance signal sources, this difference may require circuit analysis to confirm acceptable performance.

Q: Does the higher maximum supply voltage of the LM324N provide any advantage?

A: The LM324N maximum supply voltage rating of 32 V exceeds the LM2902NE4 specification of 26 V. This provides additional design margin for applications operating near the upper supply voltage limit. However, the LM2902NE4 specification of 26 V is sufficient for most standard applications.

Q: What is the inventory status of these components?

A: The LM2902NE4 has 873 pieces available as new original stock and is designated as Last Time Buy, indicating limited future availability. The LM324N has significantly higher inventory of 324,525 pieces available as new original stock, though it is designated as obsolete. Long-term component availability should be confirmed with suppliers before committing to production designs.

Q: Are there any compliance or regulatory differences between these parts?

A: The LM2902NE4 is RoHS3 compliant and REACH unaffected. The LM324N is not RoHS compliant. Organizations operating under RoHS directives or customer requirements mandating RoHS compliance must use the LM2902NE4 or identify an alternative RoHS-compliant substitute.