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LM2902N Equivalent & Substitute Parts
Part Overview
The LM2902N is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-pin DIP package. Manufactured by onsemi, this device operates across a wide supply voltage range of 3V to 32V and is suitable for general-purpose amplification applications with a gain-bandwidth product of 1 MHz.
The LM2902N carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 90 | nA |
| Voltage - Input Offset | 2 | mV |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | V |
| Operating Temperature | -40 to 105 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM2902N is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:
Primary Substitution Criteria:
- Amplifier Type: General Purpose
- Number of Circuits: 4
- Gain Bandwidth Product: 1 MHz (or higher)
- Current - Input Bias: 90 nA (or lower)
- Voltage - Input Offset: 2 mV (or lower)
- Current - Output / Channel: 40 mA (or higher)
- Voltage - Supply Span: Minimum 3V, Maximum 32V (or wider range)
- Operating Temperature: -40°C to 105°C (or wider range)
- Package / Case: 14-DIP through-hole configuration
Substitute parts are grouped into two categories:
Category 1: Direct Electrical Equivalents with Package Variation Parts that maintain identical electrical specifications but differ in mounting technology (surface mount versus through-hole) or packaging format. These parts are suitable for designs where package conversion is feasible.
Category 2: Functional Equivalents with Parameter Variance Parts that satisfy the core electrical requirements but exhibit variations in secondary parameters such as slew rate, supply current, or temperature range. These parts are suitable for applications where the variance does not impact system performance.
Parameter Comparison
| Parameter | LM2902N (onsemi) | LM2902DR2G | LM2902D | LF444CN/NOPB | LM2902KN | LM2902N (STMicroelectronics) | LM2902N/NOPB | LM324N | LM324NE3 | LP2902N |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments | STMicroelectronics | Texas Instruments | Intersil | Texas Instruments | Texas Instruments |
| Amplifier Type | General Purpose | General Purpose | General Purpose | J-FET | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Gain Bandwidth Product (MHz) | 1 | 1 | 1.2 | 1 | 1.2 | 1 | 1 | — | 1.2 | 0.1 |
| Current - Input Bias (nA) | 90 | 90 | 20 | 0.01 | 20 | 20 | 45 | 45 | 45 | 2 |
| Voltage - Input Offset (mV) | 2 | 2 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 |
| Current - Output / Channel (mA) | 40 | 40 | 30 | 14 | 30 | 40 | 40 | 40 | 40 | 10 |
| Voltage - Supply Span (Min) (V) | 3 | 3 | 3 | 36 | 3 | 3 | 3 | 3 | 3 | 3 |
| Voltage - Supply Span (Max) (V) | 32 | 32 | 26 | 36 | 26 | 30 | 32 | 32 | 32 | 26 |
| Operating Temperature (°C) | -40 to 105 | -40 to 105 | -40 to 125 | 0 to 70 | -40 to 125 | -40 to 125 | -40 to 85 | 0 to 70 | 0 to 70 | -40 to 85 |
| Mounting Type | Through Hole | Surface Mount | Surface Mount | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | 14-DIP | 14-SOIC | 14-SOIC | 14-DIP | 14-DIP | 14-DIP | 14-DIP | 14-DIP | 14-DIP | 14-DIP |
| Product Status | Obsolete | Active | Obsolete | Active | Active | Obsolete | Active | Obsolete | Last Time Buy | Last Time Buy |
| RoHS Status | — | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: LM2902N/NOPB (Texas Instruments)
The LM2902N/NOPB manufactured by Texas Instruments is the preferred substitute for the obsolete onsemi LM2902N. This part maintains identical electrical specifications including 1 MHz gain-bandwidth product, 45 nA input bias current, 2 mV input offset voltage, and 40 mA output current per channel. The device operates across the full 3V to 32V supply range and supports the -40°C to 85°C temperature range. The part carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Packaging remains 14-DIP through-hole configuration, enabling direct board-level substitution without design modification.
Secondary Recommendation: LM2902DR2G (onsemi)
The LM2902DR2G provides electrical equivalence to the original LM2902N with identical specifications across all critical parameters. This part is manufactured by onsemi, the original manufacturer of the LM2902N, ensuring design continuity and manufacturing consistency. The device carries Active product status with ROHS3 compliance and maintains 205,100 units in current inventory. The primary distinction is surface-mount 14-SOIC packaging, requiring PCB redesign or adapter solutions for through-hole applications.
Tertiary Recommendation: LM2902KN (Texas Instruments)
The LM2902KN offers functional equivalence with enhanced temperature range coverage (-40°C to 125°C) and improved gain-bandwidth product (1.2 MHz). Input bias current is reduced to 20 nA, and input offset voltage increases to 3 mV. Output current per channel is 30 mA, which is lower than the original specification. This part is suitable for applications requiring extended temperature operation and is available in 14-DIP through-hole packaging with Active product status and ROHS3 compliance.
Alternative for Low-Power Applications: LP2902N (Texas Instruments)
The LP2902N is suitable for applications where reduced power consumption is prioritized. This part features significantly lower supply current (150 µA versus typical 1.5 mA) and reduced output current per channel (10 mA). The gain-bandwidth product is reduced to 100 kHz, and input bias current is 2 nA. The device operates across 3V to 26V supply range and -40°C to 85°C temperature range. Product status is Last Time Buy with ROHS3 compliance. This part is not recommended for direct substitution in applications requiring the full 40 mA output current specification.
Not Recommended: LF444CN/NOPB (Texas Instruments)
The LF444CN/NOPB is a J-FET amplifier with fundamentally different input characteristics (10 pA input bias current versus 90 nA). While this part offers superior input bias current performance, it requires fixed ±36V dual supply operation, incompatible with the single-supply 3V to 32V range of the LM2902N. Output current per channel is limited to 14 mA. This part is not suitable for direct substitution.
Not Recommended: LM324N and LM324NE3
The LM324N (Intersil) carries RoHS non-compliant status and obsolete product status. The LM324NE3 (Texas Instruments) is designated Last Time Buy with restricted temperature range (0°C to 70°C), which does not meet the original -40°C to 105°C specification. Neither part is recommended for new designs or long-term supply assurance.
Frequently Asked Questions (FAQ)
Q: Can the LM2902DR2G be used as a direct replacement for the LM2902N in existing designs?
A: The LM2902DR2G provides complete electrical equivalence to the LM2902N. However, the primary difference is packaging format: LM2902DR2G uses 14-SOIC surface-mount configuration while LM2902N uses 14-DIP through-hole configuration. Direct board-level substitution is not possible without PCB redesign or use of surface-mount-to-DIP adapter modules. If PCB modification is feasible, the LM2902DR2G is electrically compatible.
Q: What is the key difference between the LM2902N/NOPB and the original onsemi LM2902N?
A: Both parts maintain identical electrical specifications: 1 MHz gain-bandwidth product, 2 mV input offset voltage, 40 mA output current per channel, and 3V to 32V supply range. The LM2902N/NOPB is manufactured by Texas Instruments rather than onsemi. The primary advantage of the Texas Instruments version is Active product status, ensuring continued availability and manufacturing support. The onsemi version carries Obsolete status. Both use 14-DIP through-hole packaging and are pin-compatible.
Q: Is the LM2902KN suitable for applications requiring the full 40 mA output current specification?
A: No. The LM2902KN provides only 30 mA output current per channel, which is 10 mA below the original LM2902N specification of 40 mA. Applications requiring the full 40 mA output current must use the LM2902N/NOPB or LM2902DR2G. The LM2902KN is suitable for applications with output current requirements of 30 mA or less.
Q: Can the LP2902N be used in high-current output applications?
A: No. The LP2902N is designed for low-power operation and provides only 10 mA output current per channel, compared to the original 40 mA specification. Additionally, the gain-bandwidth product is reduced to 100 kHz. The LP2902N is suitable only for applications with reduced output current and bandwidth requirements. For applications requiring 40 mA output current, use LM2902N/NOPB or LM2902DR2G.
Q: What is the temperature range limitation of the LM324N and LM324NE3?
A: The LM324N (Intersil) and LM324NE3 (Texas Instruments) both operate across 0°C to 70°C, which is narrower than the original LM2902N range of -40°C to 105°C. These parts are not suitable for applications requiring operation below 0°C or above 70°C. For extended temperature range applications, use LM2902N/NOPB (-40°C to 85°C) or LM2902KN (-40°C to 125°C).
Q: Why is the LF444CN/NOPB not recommended as a substitute?
A: The LF444CN/NOPB is a J-FET amplifier with fundamentally different operating characteristics. It requires fixed ±36V dual supply operation, whereas the LM2902N operates on single supply from 3V to 32V. The LF444CN/NOPB output current per channel is limited to 14 mA, below the 40 mA specification. These differences make the LF444CN/NOPB incompatible with LM2902N applications.
Q: What is the significance of ROHS3 compliance in selecting a substitute part?
A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. Parts with ROHS3 compliance are suitable for applications subject to environmental regulations in the European Union and other regions with equivalent standards. The LM2902N/NOPB, LM2902DR2G, LM2902KN, and LP2902N all carry ROHS3 compliance. Parts without ROHS3 compliance (such as LM324N and LM2902D) may face regulatory restrictions in certain markets.
Q: Is the LM2902D a suitable substitute despite its Obsolete status?
A: The LM2902D provides electrical equivalence with 1.2 MHz gain-bandwidth product and 30 mA output current per channel. However, it carries Obsolete product status and RoHS non-compliant designation. The part is available in 14-SOIC surface-mount packaging, not through-hole. For new designs or long-term supply assurance, the Active-status LM2902N/NOPB is strongly preferred. The LM2902D may be considered only for legacy system maintenance where supply is confirmed available.
Q: What inventory considerations should guide substitute part selection?
A: Current inventory levels are: LM2902N/NOPB (Texas Instruments) 19,859 units, LM2902DR2G (onsemi) 205,100 units, LM324N (Intersil) 324,525 units, and LP2902N (Texas Instruments) 3,180 units. High inventory levels indicate sustained supplier commitment and long-term availability. The LM2902DR2G offers the highest inventory position, supporting extended production runs. For critical applications, verify current inventory status with suppliers before finalizing design decisions.
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