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LM2902MX Equivalent & Substitute Parts
Part Overview
The LM2902MX is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. The LM2902MX operates across a wide supply voltage range of 3V to 26V and maintains functionality across an extended temperature range of -40°C to 125°C, making it suitable for industrial and consumer applications requiring stable amplification characteristics.
Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain functional compatibility while meeting the same electrical specifications and package requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.3 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply | 1.4 | mA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 26 | V |
| Operating Temperature | -40 to 125 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the LM2902MX are selected based on strict electrical and mechanical compatibility criteria. The following parameters define acceptable substitution:
Critical Matching Parameters:
- Amplifier Type: General Purpose
- Number of Circuits: 4
- Package / Case: 14-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Supply Voltage Range: Minimum 3V, Maximum ≥26V
- Operating Temperature Range: Minimum ≤-40°C, Maximum ≥125°C
- RoHS3 Compliance and MSL Level 1 rating
Performance Parameters (Allowable Variation):
- Slew Rate: 0.3V/µs or higher
- Gain Bandwidth Product: 1 MHz or higher
- Current - Input Bias: 20 nA or lower
- Voltage - Input Offset: 3 mV or lower
- Current - Supply: 1.4 mA or lower
- Current - Output / Channel: 30 mA or higher
Substitute parts are grouped into two categories: direct functional equivalents with identical output type (single-ended) and alternative configurations with differential output capability. All substitute parts maintain the 14-SOIC package footprint and surface mount assembly compatibility.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Max (V) | Temp Range (°C) | Output Type |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LM2902MX | Rohm Semiconductor | Obsolete | 0.3 | 1.0 | 20 | 3 | 1.4 | 30 | 26 | -40 to 125 | Single-Ended |
| LM224ADT | STMicroelectronics | Active | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 30 | -40 to 105 | Single-Ended |
| LM2902KVQDRG4 | Texas Instruments | Last Time Buy | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 30 | -40 to 125 | Single-Ended |
| LM2902M/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 2 | 1.5 | 40 | 32 | -40 to 85 | Single-Ended |
| LM2902MX/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 2 | 1.5 | 40 | 32 | -40 to 85 | Single-Ended |
| AS324MTR-G1 | Diodes Incorporated | Active | — | — | 20 | 2 | 1.0 | 40 | 36 | -40 to 85 | Single-Ended |
| LM124D | STMicroelectronics | Obsolete | 0.4 | 1.2 | 20 | 2 | 1.5 | 30 | 30 | -55 to 125 | Differential |
| LM124DG4 | Texas Instruments | Last Time Buy | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DR | Texas Instruments | Active | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DRG4 | Texas Instruments | Discontinued at DiGi Electronics | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DT | STMicroelectronics | Active | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 30 | -55 to 125 | Differential |
Engineering Selection Recommendations
Primary Substitutes (Active Product Status):
The LM224ADT (STMicroelectronics) and LM2902MX/NOPB (Texas Instruments) are recommended as primary substitutes. Both parts maintain active product status, ensuring long-term availability and manufacturing support. The LM224ADT provides enhanced performance with higher slew rate (0.4V/µs) and gain bandwidth product (1.3 MHz), while maintaining compatibility with the original 14-SOIC package and surface mount assembly process. The LM2902MX/NOPB offers identical base product architecture with extended supply voltage capability (32V maximum) and maintains the 1 MHz gain bandwidth product specification.
Secondary Substitutes (Last Time Buy / Discontinued Status):
The LM2902KVQDRG4 (Texas Instruments) and LM124DG4 (Texas Instruments) are classified as Last Time Buy, indicating limited future availability. These parts remain suitable for applications requiring extended temperature operation (-40°C to 125°C) and are compatible with existing PCB designs. The LM124DG4 provides differential output capability, which may be advantageous in noise-sensitive applications, though this requires circuit topology verification.
Alternative Substitutes (Extended Supply Range):
The AS324MTR-G1 (Diodes Incorporated) offers the widest supply voltage range (36V maximum) and maintains active product status. This part is suitable for applications requiring higher supply voltage margins. However, the operating temperature range is limited to -40°C to 85°C, which does not meet the original -40°C to 125°C specification.
Compliance Verification:
All recommended substitute parts maintain ROHS3 compliance and MSL Level 1 rating, consistent with the original LM2902MX specification. All parts are suitable for surface mount assembly in 14-SOIC packages with 0.154" (3.90mm) width.
Frequently Asked Questions (FAQ)
Q: Can the LM224ADT directly replace the LM2902MX in existing designs?
A: The LM224ADT is functionally compatible with the LM2902MX for most applications. Both devices are 4-circuit general-purpose operational amplifiers in 14-SOIC packages. The LM224ADT offers improved performance specifications (higher slew rate and gain bandwidth product) and extended maximum supply voltage (30V vs. 26V). However, the operating temperature range is limited to -40°C to 105°C, which is narrower than the original -40°C to 125°C specification. Verify that your application does not require operation above 105°C.
Q: What is the difference between single-ended and differential output types?
A: The LM2902MX features single-ended output configuration, where each amplifier output is referenced to ground. The LM124 series devices feature differential output configuration, which provides two complementary outputs per amplifier. Differential outputs are used in specific circuit topologies for noise rejection and signal conditioning. Direct substitution of differential output devices requires circuit topology verification to ensure proper signal routing and termination.
Q: Why does the LM2902M/NOPB show higher input bias current (45 nA) compared to the original specification (20 nA)?
A: The LM2902M/NOPB is manufactured using LinCMOS™ technology by Texas Instruments, which differs from the original Rohm Semiconductor process. While the input bias current is higher, it remains within acceptable limits for most general-purpose amplifier applications. Applications with extremely high source impedance may require evaluation of this parameter.
Q: Is the LM124DR suitable as a substitute if my circuit uses single-ended outputs?
A: The LM124DR is a differential output device, whereas the LM2902MX is single-ended. While the LM124DR can be used in single-ended mode by connecting only one output and grounding the complementary output, this configuration does not utilize the full capability of the device. For single-ended applications, the LM224ADT or LM2902MX/NOPB are more appropriate selections.
Q: What packaging options are available for substitute parts?
A: All substitute parts listed are available in 14-SOIC surface mount packages with 0.154" (3.90mm) width, maintaining PCB footprint compatibility with the original LM2902MX. Packaging formats vary by supplier: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube. Verify packaging format compatibility with your procurement and assembly processes.
Q: Can I use the AS324MTR-G1 in applications requiring -40°C to 125°C operation?
A: The AS324MTR-G1 is rated for -40°C to 85°C operation, which does not meet the extended temperature requirement of -40°C to 125°C. For applications requiring the full temperature range, select the LM2902KVQDRG4, LM124DG4, LM124DR, or LM124DT instead.
Q: Are all substitute parts RoHS3 compliant?
A: Yes, all substitute parts listed in this reference maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, consistent with the original LM2902MX specification. This ensures compatibility with modern manufacturing processes and environmental regulations.
Q: What is the significance of "Last Time Buy" product status?
A: "Last Time Buy" indicates that the manufacturer has announced end-of-life for the product and will accept orders only until a specified cutoff date. After this date, the part will no longer be available from the manufacturer. Parts with this status should be evaluated for long-term availability and inventory planning. For new designs, select parts with "Active" product status to ensure sustained availability.
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