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LM324M Equivalent & Substitute Parts
Part Overview
The LM324M is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in 14-SOP surface mount packaging. This part is classified as obsolete, though 2236 units remain in stock as new original inventory. The LM324M operates across a supply voltage range of 3V to 32V with an operating temperature range of 0°C to 70°C, making it suitable for general analog signal processing applications requiring low input bias current and moderate output drive capability.
Due to its obsolete product status, identifying active equivalent and substitute parts is essential for design continuity, long-term supply chain reliability, and new production planning. Active alternatives with compatible electrical and mechanical specifications are available from the same manufacturer.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Current - Input Bias | 40 | nA |
| Voltage - Input Offset | 1.5 | mV |
| Current - Supply | 1 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | V |
| Operating Temperature | 0 to 70 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| REACH Status | REACH Unaffected | — |
Substitute Part Grouping Explanation
Substitution of the LM324M is determined by strict alignment of electrical and mechanical parameters within the general-purpose operational amplifier category. The following criteria establish valid substitution relationships:
Primary Substitution Criteria:
- Number of circuits: 4 (mandatory)
- Amplifier type: General Purpose (mandatory)
- Package / Case: 14-SOIC (0.154", 3.90mm Width) (mandatory)
- Mounting type: Surface Mount (mandatory)
- Voltage supply span: Minimum 3V, Maximum ≥32V
- Current output per channel: ≥40 mA
- Current input bias: ≤90 nA
- Voltage input offset: ≤2 mV
- Operating temperature range: Must encompass or extend the 0°C to 70°C range
- Moisture sensitivity: MSL 1 (Unlimited)
- Compliance: REACH Unaffected, RoHS3 Compliant
Substitute Categories:
Direct Substitutes (Same Base Product Number - LM324): Parts sharing the LM324 base product number with identical package and pinout, differing only in product status (active vs. obsolete) or packaging format.
Similar Substitutes (Extended Temperature or Enhanced Performance): Parts with different base product numbers (LM224, LM2902, MC33074, MC34074) that maintain core electrical compatibility while offering extended temperature ranges, enhanced performance characteristics, or different output types.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Input Bias (nA) | Input Offset (mV) | Output/Channel (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| LM324M | onsemi | Obsolete | 40 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-SOIC | — |
| LM324DR2G | onsemi | Active | 90 | 2 | 40 | 3 | 32 | 0 to 70 | 14-SOIC | ROHS3 Compliant |
| LM224DR2G | onsemi | Active | 90 | 2 | 40 | 3 | 32 | -25 to 85 | 14-SOIC | ROHS3 Compliant |
| LM2902DR2G | onsemi | Active | 90 | 2 | 40 | 3 | 32 | -40 to 105 | 14-SOIC | ROHS3 Compliant |
| LM2902VDR2G | onsemi | Active | 90 | 2 | 40 | 3 | 32 | -40 to 125 | 14-SOIC | ROHS3 Compliant |
| LM324ADR2G | onsemi | Active | 40 | 2 | 40 | 3 | 32 | 0 to 70 | 14-SOIC | ROHS3 Compliant |
| MC33074ADR2G | onsemi | Active | 100 | 0.5 | 30 | 3 | 44 | -40 to 85 | 14-SOIC | ROHS3 Compliant |
| MC33074DR2G | onsemi | Active | 100 | 1 | 30 | 3 | 44 | -40 to 85 | 14-SOIC | ROHS3 Compliant |
| MC34074ADR2G | onsemi | Active | 100 | 0.5 | 30 | 3 | 44 | 0 to 70 | 14-SOIC | ROHS3 Compliant |
| MC34074DR2G | onsemi | Active | 100 | 1 | 30 | 3 | 44 | 0 to 70 | 14-SOIC | ROHS3 Compliant |
| MC34074VDR2G | onsemi | Active | 100 | 1 | 30 | 3 | 44 | -40 to 125 | 14-SOIC | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance):
LM324ADR2G is the primary direct substitute for LM324M. Both parts share the LM324 base product number, maintain identical input bias current (40 nA), operate across the same temperature range (0°C to 70°C), and are packaged in 14-SOIC. LM324ADR2G is active with RoHS3 compliance, providing supply chain continuity without design modification. Inventory availability is 10,300 units.
LM324DR2G provides functional equivalence with relaxed input bias specifications (90 nA vs. 40 nA) and marginally higher input offset voltage (2 mV vs. 1.5 mV). This part is active with 105,300 units in stock and RoHS3 compliance. Selection is appropriate where the relaxed input bias specification does not impact circuit performance.
Extended Temperature Range Alternatives:
LM224DR2G extends the operating temperature range to -25°C to 85°C while maintaining all other electrical parameters compatible with LM324M. This part is active with RoHS3 compliance and 105,200 units in inventory. Selection is appropriate for applications requiring operation below 0°C or above 70°C within the extended range.
LM2902DR2G and LM2902VDR2G extend the operating temperature range to -40°C to 105°C and -40°C to 125°C respectively, with LM2902VDR2G in Tape & Reel packaging. Both maintain electrical compatibility and RoHS3 compliance. LM2902DR2G inventory is 205,100 units; LM2902VDR2G inventory is 45,400 units. Selection is appropriate for extreme temperature applications.
Enhanced Performance Alternatives:
MC34074ADR2G and MC34074DR2G offer enhanced performance characteristics including higher supply voltage maximum (44V vs. 32V), lower input offset voltage (0.5 mV and 1 mV respectively), and higher gain bandwidth product (4.5 MHz). These parts operate at 0°C to 70°C, matching the LM324M temperature range, with RoHS3 compliance. Output current per channel is 30 mA (vs. 40 mA). Selection is appropriate where enhanced precision and higher supply voltage capability are required, with acceptance of reduced output current.
MC34074VDR2G extends the temperature range to -40°C to 125°C with identical enhanced performance characteristics and Tape & Reel packaging. Inventory is 2,611 units.
MC33074ADR2G and MC33074DR2G provide similar enhanced performance with operating temperature range of -40°C to 85°C. Inventory levels are 30,100 and 37,700 units respectively.
Compliance and Supply Chain Considerations:
All recommended substitutes are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification. Product status is active for all substitutes, ensuring long-term availability and supply chain stability compared to the obsolete LM324M.
Frequently Asked Questions (FAQ)
Q: Can LM324DR2G directly replace LM324M without circuit modification?
A: LM324DR2G is functionally compatible with LM324M in the 14-SOIC package. The primary difference is relaxed input bias current specification (90 nA vs. 40 nA) and marginally higher input offset voltage (2 mV vs. 1.5 mV). Direct substitution is appropriate for applications where these relaxed specifications do not impact circuit performance. Verification of input bias current and offset voltage requirements in the specific application is necessary.
Q: What is the difference between LM324ADR2G and LM324DR2G?
A: LM324ADR2G maintains the input bias current specification of 40 nA, identical to LM324M, while LM324DR2G specifies 90 nA. Both operate across 0°C to 70°C and are packaged in 14-SOIC. LM324ADR2G is the preferred substitute where input bias current specification is critical to circuit performance. LM324DR2G is appropriate where relaxed input bias specification is acceptable.
Q: Can I use MC34074 series parts as substitutes for LM324M?
A: MC34074 series parts are compatible in 14-SOIC packaging and maintain the 4-circuit general-purpose amplifier configuration. However, output current per channel is reduced to 30 mA (vs. 40 mA for LM324M). MC34074 parts offer enhanced performance including lower input offset voltage and higher supply voltage maximum (44V). Selection is appropriate where the reduced output current capability is acceptable and enhanced precision is beneficial. Applications requiring 40 mA output per channel should use LM324 or LM2902 series alternatives.
Q: What is the difference between Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) packaging?
A: Both are surface mount packaging formats suitable for automated assembly. Cut Tape & Digi-Reel packaging is supplied on tape that can be cut to length for manual or semi-automated handling. Tape & Reel packaging is supplied on continuous reel format optimized for high-volume automated assembly lines. Electrical and mechanical specifications are identical; packaging selection depends on assembly process requirements and volume.
Q: Why does LM2902VDR2G have a higher maximum operating temperature than LM2902DR2G?
A: LM2902VDR2G is specified for -40°C to 125°C operating temperature range, while LM2902DR2G is specified for -40°C to 105°C. Both parts are electrically identical in the 14-SOIC package. The extended temperature rating of LM2902VDR2G accommodates applications requiring operation at higher ambient temperatures. Selection depends on the specific thermal environment of the application.
Q: Are all substitute parts RoHS3 compliant?
A: All recommended substitute parts are RoHS3 compliant. The obsolete LM324M does not carry RoHS certification. All active substitutes meet current regulatory requirements for hazardous substance restrictions, making them suitable for new designs and production planning.
Q: Can I use LM224DR2G in an application designed for 0°C to 70°C operation?
A: LM224DR2G is specified for -25°C to 85°C operating temperature range, which encompasses the 0°C to 70°C range. The part is electrically compatible and can be used in applications designed for 0°C to 70°C operation. The extended temperature range provides additional margin for thermal variations but does not affect performance within the original specification range.
Q: What is the significance of the "M" suffix in LM324M?
A: The "M" suffix in LM324M indicates the specific packaging and temperature grade variant. LM324M is packaged in 14-SOP (Small Outline Package) format. The active equivalent LM324ADR2G uses the 14-SOIC designation, which is mechanically and electrically equivalent. The different suffix reflects manufacturing and packaging evolution while maintaining functional compatibility.
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