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LM324AMX Equivalent & Substitute Parts
Part Overview
The LM324AMX is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in a 14-SOP surface mount package. This part is classified as obsolete, though 19,649 units remain in stock as new original inventory. The LM324AMX 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-purpose amplification applications requiring low input bias current and moderate bandwidth characteristics.
Due to its obsolete product status, identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new product development. Active alternatives with identical or superior electrical characteristics are available from the same manufacturer in compatible package configurations.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 40 | nA |
| Voltage - Input Offset | 1.5 | mV |
| Current - Supply | 1.5 | 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 LM324AMX is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Number of circuits: 4 (mandatory)
- Package type: 14-SOIC surface mount configuration (mandatory)
- Gain bandwidth product: 1 MHz (mandatory for direct equivalence)
- Supply voltage range: Minimum 3V, Maximum 32V (mandatory)
- Current output per channel: 40 mA (mandatory)
- Mounting type: Surface mount (mandatory)
Secondary Compatibility Parameters:
- Input bias current: 40 nA or higher acceptable
- Input offset voltage: 1.5 mV or lower preferred
- Supply current: 1.5 mA or lower preferred
- Operating temperature range: Must encompass or exceed 0°C to 70°C
Direct Equivalents maintain all primary criteria with minimal electrical variation. Similar Substitutes maintain package and circuit configuration but may exhibit different operating temperature ranges, input bias current specifications, or enhanced electrical performance characteristics. All substitute parts listed are active products with current manufacturing status and RoHS3 compliance.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Gain BW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output/Ch (mA) | Temp Range (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| LM324AMX | onsemi | Obsolete | 1 | 40 | 1.5 | 1.5 | 40 | 0 to 70 | 14-SOIC | — |
| LM324ADR2G | onsemi | Active | 1 | 40 | 2 | 1.5 | 40 | 0 to 70 | 14-SOIC | ROHS3 |
| LM224DR2G | onsemi | Active | 1 | 90 | 2 | — | 40 | -25 to 85 | 14-SOIC | ROHS3 |
| LM2902DR2G | onsemi | Active | 1 | 90 | 2 | — | 40 | -40 to 105 | 14-SOIC | ROHS3 |
| LM2902VDR2G | onsemi | Active | 1 | 90 | 2 | — | 40 | -40 to 125 | 14-SOIC | ROHS3 |
| LM324DR2G | onsemi | Active | 1 | 90 | 2 | — | 40 | 0 to 70 | 14-SOIC | ROHS3 |
| MC33074ADR2G | onsemi | Active | 4.5 | 100 | 0.5 | 1.9 | 30 | -40 to 85 | 14-SOIC | ROHS3 |
| MC33074DR2G | onsemi | Active | 4.5 | 100 | 1 | 1.9 | 30 | -40 to 85 | 14-SOIC | ROHS3 |
| MC34074ADR2G | onsemi | Active | 4.5 | 100 | 0.5 | 1.9 | 30 | 0 to 70 | 14-SOIC | ROHS3 |
| MC34074DR2G | onsemi | Active | 4.5 | 100 | 1 | 1.9 | 30 | 0 to 70 | 14-SOIC | ROHS3 |
| MC34074VDR2G | onsemi | Active | 4.5 | 100 | 1 | 1.9 | 30 | -40 to 125 | 14-SOIC | ROHS3 |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute):
LM324ADR2G is the closest direct equivalent to the LM324AMX. Both parts share identical gain bandwidth product (1 MHz), matching output current per channel (40 mA), and identical operating temperature range (0°C to 70°C). The LM324ADR2G differs only in input offset voltage specification (2 mV versus 1.5 mV) and is available in active product status with RoHS3 compliance. This part is suitable for direct replacement in existing designs without circuit modification.
Extended Temperature Range Alternatives:
LM224DR2G and LM2902DR2G maintain the 1 MHz gain bandwidth product and 40 mA output current specifications while extending the operating temperature range to -25°C to 85°C and -40°C to 105°C respectively. These parts are appropriate for applications requiring enhanced temperature performance. LM2902VDR2G extends the upper temperature limit to 125°C and is supplied in Tape & Reel packaging.
Enhanced Performance Alternatives:
MC34074ADR2G and MC34074DR2G provide superior electrical performance with 4.5 MHz gain bandwidth product, lower input offset voltage (0.5 mV and 1 mV respectively), and operating temperature range of 0°C to 70°C. These parts are suitable for applications requiring higher bandwidth and improved precision. MC34074VDR2G extends the temperature range to -40°C to 125°C.
All substitute parts are manufactured by onsemi, comply with REACH regulations, and are classified as ROHS3 compliant. All parts are available in 14-SOIC surface mount package configuration with MSL rating of 1 (Unlimited).
Frequently Asked Questions (FAQ)
Q: Can LM324ADR2G be used as a direct replacement for LM324AMX?
A: Yes. LM324ADR2G is the direct equivalent. Both parts maintain identical gain bandwidth product (1 MHz), output current per channel (40 mA), and operating temperature range (0°C to 70°C). The input offset voltage specification differs by 0.5 mV (2 mV versus 1.5 mV), which is within acceptable tolerance for general-purpose amplifier applications. LM324ADR2G is active product status with RoHS3 compliance.
Q: What is the difference between LM324DR2G and LM324ADR2G?
A: Both parts are LM324 base product variants with identical electrical specifications. The primary difference is input bias current specification: LM324ADR2G specifies 40 nA, while LM324DR2G specifies 90 nA. Both maintain 1 MHz gain bandwidth product, 40 mA output current per channel, and 0°C to 70°C operating temperature range. Selection depends on input bias current requirements for the specific application.
Q: Are MC34074 parts compatible with LM324AMX?
A: MC34074 parts are compatible in package configuration (14-SOIC) and circuit count (4 circuits) but provide enhanced electrical performance. MC34074 parts feature 4.5 MHz gain bandwidth product (versus 1 MHz), lower input offset voltage (0.5 to 1 mV), and higher supply voltage maximum (44V versus 32V). These parts are suitable for applications requiring higher bandwidth and improved precision but may require circuit optimization for stability in existing designs.
Q: What is the significance of the packaging designation (DR2G versus VDR2G)?
A: DR2G indicates Cut Tape (CT) & Digi-Reel® packaging, while VDR2G indicates Tape & Reel (TR) packaging. Both are surface mount configurations suitable for automated assembly. Selection depends on manufacturing process requirements and volume considerations. Electrical specifications remain identical between packaging variants.
Q: Can LM2902VDR2G replace LM324AMX in high-temperature applications?
A: LM2902VDR2G is suitable for applications requiring extended temperature range (-40°C to 125°C). It maintains 1 MHz gain bandwidth product and 40 mA output current per channel. Input bias current is specified at 90 nA (versus 40 nA for LM324AMX). The part is active product status with RoHS3 compliance and is appropriate for designs requiring temperature performance beyond the original 0°C to 70°C specification.
Q: What are the key parameters that determine substitution compatibility?
A: Substitution compatibility is determined by: (1) Number of circuits (4 mandatory), (2) Package type (14-SOIC surface mount mandatory), (3) Gain bandwidth product (1 MHz for direct equivalence), (4) Supply voltage range (3V to 32V minimum), (5) Output current per channel (40 mA), and (6) Operating temperature range (must encompass or exceed 0°C to 70°C). Secondary parameters include input bias current, input offset voltage, and supply current specifications.
Q: Is RoHS3 compliance required for substitution?
A: RoHS3 compliance is not a substitution requirement but is a regulatory consideration for new product designs and manufacturing environments subject to RoHS directives. All active substitute parts listed are RoHS3 compliant. The original LM324AMX does not specify RoHS status due to its obsolete classification.
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