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LM2902DT Equivalent & Substitute Parts
Part Overview
The LM2902DT 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 "Not For New Designs," indicating its status as a legacy product. The LM2902DT operates across a wide supply voltage range of 3V to 32V and maintains functionality across an extended temperature range of -40°C to 125°C, making it suitable for industrial and consumer applications requiring general-purpose amplification.
Due to its legacy status, identifying equivalent and substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain electrical compatibility across critical parameters including supply voltage range, input bias current, output current capability, and package form factor.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.3 | V/µs |
| Gain Bandwidth Product | 800 | kHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 1 | mA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | 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 LM2902DT are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Compatibility Parameters:
- Number of circuits: 4 (all substitutes must provide 4 independent amplifier circuits)
- Package form factor: 14-SOIC (0.154", 3.90mm Width) surface mount configuration
- Supply voltage range: Minimum 3V to maximum 30V or higher
- Input bias current: 20 nA nominal specification
- Output current per channel: 30 mA or greater
- Operating temperature range: Must encompass or exceed -40°C to 125°C
- RoHS3 compliance and MSL Level 1 rating
Substitute parts are grouped into two categories based on functional equivalence:
Category 1: Direct Electrical Equivalents — Parts with identical or superior electrical performance across all critical parameters, including slew rate, gain bandwidth product, and supply current specifications. These parts are interchangeable without circuit redesign.
Category 2: Compatible Alternatives — Parts meeting all critical compatibility parameters but with variations in secondary specifications such as slew rate or gain bandwidth product. These parts require verification of application-specific performance requirements before substitution.
Parameter Comparison
| Part Number | Manufacturer | Circuits | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM2902DT | Rohm Semiconductor | 4 | 0.3 | 0.8 | 20 | 1 | 1 | 30 | 3 | 32 | -40 to 125 | Not For New Designs |
| LM124D | STMicroelectronics | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 30 | 3 | 30 | -55 to 125 | Obsolete |
| LM124DG4 | Texas Instruments | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | Last Time Buy |
| LM124DR | Texas Instruments | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | Active |
| LM124DRG4 | Texas Instruments | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | Discontinued at DiGi Electronics |
| LM124DT | STMicroelectronics | 4 | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -55 to 125 | Active |
| LM224D | STMicroelectronics | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 105 | Active |
| LM224DR | UMW | 4 | 0.5 | 1.2 | 20 | 3 | 0.7 | 30 | 3 | 32 | -20 to 85 | Active |
| LM224DR2G | onsemi | 4 | — | 1 | 90 | 2 | — | 40 | 3 | 32 | -25 to 85 | Active |
| LM224DRG3 | Texas Instruments | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -25 to 85 | Last Time Buy |
Engineering Selection Recommendations
Primary Recommendation: LM124DR (Texas Instruments)
The LM124DR is the preferred substitute for the LM2902DT. This part maintains active product status with high inventory availability (171,766 units), ensuring long-term supply continuity. The LM124DR meets all critical electrical parameters: 4-circuit configuration, 14-SOIC package, 3V to 30V supply range, 20 nA input bias current, and 30 mA output current per channel. The extended operating temperature range of -55°C to 125°C exceeds the LM2902DT specification. Both parts are ROHS3 compliant with MSL Level 1 rating. The LM124DR is supplied in Cut Tape and Digi-Reel packaging, supporting both prototype and production environments.
Secondary Recommendation: LM124DT (STMicroelectronics)
The LM124DT provides an alternative from STMicroelectronics with active product status and substantial inventory (10,200 units). This part exceeds the LM2902DT in output current capability (40 mA per channel versus 30 mA) and gain bandwidth product (1.3 MHz versus 0.8 MHz). The operating temperature range of -55°C to 125°C matches the extended specification. Supply voltage range is 3V to 30V. ROHS3 compliance and MSL Level 1 rating are maintained.
Tertiary Recommendation: LM224D (STMicroelectronics)
The LM224D is an active product with 4,495 units in inventory. This part operates across -40°C to 105°C, which covers the LM2902DT lower temperature bound but does not extend to 125°C. The 3V to 30V supply range and 40 mA output current per channel provide adequate performance for most applications. ROHS3 compliance and MSL Level 1 rating apply.
Not Recommended: LM224DR2G (onsemi)
The LM224DR2G exhibits significant deviations from the LM2902DT specification. Input bias current is specified at 90 nA, substantially higher than the 20 nA requirement. Operating temperature range is limited to -25°C to 85°C, which does not meet the -40°C lower bound. Slew rate is not specified. This part is suitable only for applications with relaxed input bias current and temperature requirements.
Not Recommended: LM124D and LM124DG4
LM124D is classified as obsolete, and LM124DG4 is designated Last Time Buy. These parts present supply risk and should not be selected for new production designs or long-term applications.
Frequently Asked Questions (FAQ)
Q: Can the LM124DR be used as a direct replacement for the LM2902DT without circuit modification?
A: The LM124DR is electrically compatible with the LM2902DT across all critical parameters. Both devices provide 4 independent operational amplifier circuits in a 14-SOIC package with identical input bias current (20 nA), output current capability (30 mA per channel), and supply voltage range compatibility (3V minimum). The LM124DR's superior slew rate (0.5 V/µs versus 0.3 V/µs) and gain bandwidth product (1.2 MHz versus 0.8 MHz) represent performance enhancements that do not require circuit redesign. Direct substitution is supported.
Q: What is the significance of the supply voltage maximum difference between the LM2902DT (32V) and LM124DR (30V)?
A: The LM2902DT supports operation up to 32V supply, while the LM124DR is rated to 30V maximum. For applications operating at supply voltages between 30V and 32V, the LM124DR is not suitable. In such cases, the LM224DR (UMW) or LM224D (STMicroelectronics) should be evaluated, as both support 32V maximum supply voltage. For applications operating at 30V or below, this difference is not a limiting factor.
Q: Are all substitute parts available in the same packaging format?
A: All recommended substitute parts are supplied in 14-SOIC (0.154", 3.90mm Width) surface mount packages, matching the LM2902DT form factor. However, packaging options differ by manufacturer and part number. The LM124DR is available in Cut Tape and Digi-Reel formats. The LM124DT is supplied in Cut Tape and Digi-Reel. The LM224D is supplied in Tube packaging. The LM224DR is available in Cut Tape and Digi-Reel. Verify packaging availability with your supplier to ensure compatibility with assembly processes.
Q: Why is the LM224DR2G not recommended despite its active status?
A: The LM224DR2G deviates significantly from the LM2902DT specification in two critical areas. Input bias current is specified at 90 nA, compared to the 20 nA requirement of the LM2902DT. This 4.5-fold increase in input bias current can introduce unacceptable offset errors in precision applications. Additionally, the operating temperature range of -25°C to 85°C does not meet the -40°C lower bound of the LM2902DT. These deviations restrict the LM224DR2G to applications with relaxed input bias current and temperature requirements.
Q: What compliance certifications apply to all substitute parts?
A: All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) rating, matching the LM2902DT. REACH status is unaffected for all parts. ECCN classification is EAR99 for all parts. These certifications ensure regulatory compliance and environmental compatibility across all substitute options.
Q: How does the operating temperature range affect part selection?
A: The LM2902DT operates across -40°C to 125°C. The LM124DR and LM124DT extend the lower temperature bound to -55°C, providing enhanced cold-temperature performance. The LM224D operates to 105°C maximum, which does not reach the 125°C upper bound of the LM2902DT. For applications requiring full -40°C to 125°C operation, the LM124DR or LM124DT are required. For applications limited to -40°C to 105°C, the LM224D is acceptable.
Q: What is the difference between input offset voltage specifications across substitute parts?
A: The LM2902DT specifies 1 mV input offset voltage. Substitute parts range from 2 mV to 3 mV. This difference reflects manufacturing process variations between manufacturers. For precision applications requiring offset voltage below 2 mV, the LM124D or LM124DT (both 2 mV) should be prioritized over parts specifying 3 mV. For general-purpose applications, this variation is typically acceptable.
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