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LM324MX Equivalent & Substitute Parts
Part Overview
The LM324MX 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 part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM324MX operates across a wide supply voltage range of 3V to 32V and is suitable for applications requiring low-power, general-purpose amplification with moderate bandwidth characteristics.
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 85 | °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 LM324MX are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Matching Parameters:
- Number of circuits: 4 channels required
- Package type: 14-SOIC surface mount form factor
- Supply voltage range: Minimum 3V, maximum 30V or higher
- Output current per channel: 30 mA or greater
- Input bias current: 20 nA or lower
- Operating temperature range: Must encompass -40°C to 85°C or broader
- RoHS3 compliance and MSL Level 1 rating
Acceptable Variation Parameters:
- Slew rate: 0.3 V/µs or higher (higher values acceptable)
- Gain bandwidth product: 800 kHz or higher (higher values acceptable)
- Input offset voltage: 1 mV to 3 mV range acceptable
- Supply current: 1 mA to 1.5 mA acceptable
Substitute parts meeting these criteria provide functional equivalence for the LM324MX in general-purpose amplifier applications while maintaining compatibility with existing PCB layouts and electrical specifications.
Parameter Comparison
| Part Number | Manufacturer | Circuits | Slew Rate (V/µs) | GBW (kHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM324MX | Rohm Semiconductor | 4 | 0.3 | 800 | 20 | 1 | 1 | 30 | 3 | 32 | -40 to 85 | 14-SOIC | Obsolete |
| LM124D | STMicroelectronics | 4 | 0.4 | 1200 | 20 | 2 | 1.5 | 30 | 3 | 30 | -55 to 125 | 14-SOIC | Obsolete |
| LM124DG4 | Texas Instruments | 4 | 0.5 | 1200 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | 14-SOIC | Last Time Buy |
| LM124DR | Texas Instruments | 4 | 0.5 | 1200 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | 14-SOIC | Active |
| LM124DRG4 | Texas Instruments | 4 | 0.5 | 1200 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 to 125 | 14-SOIC | Discontinued at DiGi Electronics |
| LM224AD | STMicroelectronics | 4 | 0.4 | 1200 | 20 | 2 | 1.5 | 30 | 3 | 30 | -40 to 105 | 14-SOIC | Obsolete |
| LM224ADR | Texas Instruments | 4 | 0.5 | 1200 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 to 85 | 14-SOIC | Active |
| LM224ADRG4 | Texas Instruments | 4 | 0.5 | 1200 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 to 85 | 14-SOIC | Obsolete |
| LM224D | STMicroelectronics | 4 | 0.4 | 1200 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 105 | 14-SOIC | Active |
| LM224DR | UMW | 4 | 0.5 | 1200 | 20 | 3 | 0.7 | 30 | 3 | 32 | -20 to 85 | 14-SOIC | Active |
| LM224DR2G | onsemi | 4 | — | 1000 | 90 | 2 | — | 40 | 3 | 32 | -25 to 85 | 14-SOIC | Active |
Engineering Selection Recommendations
Primary Recommendation: LM124DR (Texas Instruments)
The LM124DR is the preferred substitute for the LM324MX. This part is currently in active production status, ensuring long-term availability and supply chain stability. It maintains full electrical compatibility with the LM324MX across all critical parameters: 4-circuit configuration, 14-SOIC package, 3V to 30V supply range, and 30 mA output current per channel. The LM124DR exceeds the LM324MX in slew rate (0.5 V/µs vs. 0.3 V/µs) and gain bandwidth product (1.2 MHz vs. 800 kHz), providing improved performance margins. Operating temperature range extends to -55°C to 125°C, encompassing the LM324MX range. RoHS3 compliance and MSL Level 1 rating are maintained. Inventory availability is substantial at 171,766 units.
Secondary Recommendation: LM224D (STMicroelectronics)
The LM224D serves as an alternative substitute with active product status. This part provides identical circuit count and package configuration with enhanced output current capability (40 mA vs. 30 mA per channel). Operating temperature range of -40°C to 105°C covers the LM324MX specification. Supply voltage range is 3V to 30V. RoHS3 compliance and MSL Level 1 rating are confirmed. Inventory is available at 4,495 units.
Tertiary Recommendation: LM224ADR (Texas Instruments)
The LM224ADR is an active production part suitable for applications where the operating temperature range of -25°C to 85°C is acceptable. This part provides improved input bias current performance (15 nA vs. 20 nA) and maintains all other critical electrical parameters. Supply voltage range is 3V to 30V. RoHS3 compliance and MSL Level 1 rating apply. Inventory availability is high at 133,500 units.
Not Recommended: LM224DR2G (onsemi)
While the LM224DR2G is in active production, it exhibits elevated input bias current (90 nA vs. 20 nA for the LM324MX), which may impact circuit performance in applications sensitive to input current characteristics. Slew rate data is not provided. This part should be selected only when input bias current elevation is acceptable for the application.
Frequently Asked Questions (FAQ)
Q: Can the LM124DR directly replace the LM324MX without PCB modifications?
A: Yes. The LM124DR is pin-compatible with the LM324MX in the 14-SOIC package. No PCB layout changes are required. Both parts use identical pinout and package dimensions (0.154" width, 3.90mm).
Q: What is the primary difference between LM124 and LM224 series parts?
A: The LM224 series is rated for a narrower operating temperature range (-25°C to 85°C or -40°C to 105°C depending on variant) compared to the LM124 series (-55°C to 125°C). The LM224 series typically exhibits lower input bias current in some variants. Both series maintain 4-circuit configuration and 14-SOIC packaging.
Q: Is the LM324MX still available for procurement?
A: The LM324MX is classified as obsolete. Direct procurement of new original stock may be limited. Substitute parts in active production status (LM124DR, LM224D, LM224ADR) are recommended for new designs and ongoing production requirements.
Q: What does "Last Time Buy" status mean for the LM124DG4?
A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. Existing inventory may be available for a limited period, but long-term availability is not guaranteed. Parts with Active status (LM124DR, LM224D, LM224ADR) are preferred for new applications.
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, matching the LM324MX environmental and regulatory certifications.
Q: Which substitute part offers the best performance improvement over the LM324MX?
A: The LM124DR and LM124DG4 provide the highest gain bandwidth product (1.2 MHz vs. 800 kHz) and slew rate (0.5 V/µs vs. 0.3 V/µs), representing a 50% improvement in both parameters. These enhancements provide better frequency response and transient performance while maintaining backward compatibility.
Q: Can I use LM224DR2G if input bias current is not critical to my application?
A: The LM224DR2G is suitable for applications where input bias current elevation (90 nA vs. 20 nA) does not degrade circuit performance. This part offers the lowest supply current (0.7 mA) and highest output current capability (40 mA per channel) among available substitutes. Verify that the 90 nA input bias current is acceptable for your specific circuit topology before selection.
Q: What is the supply voltage compatibility range across all substitute parts?
A: All substitute parts operate within a 3V minimum supply voltage. Maximum supply voltage ranges from 30V to 32V depending on the part. The LM324MX, LM224DR, and LM224DR2G support 32V maximum, while LM124 and LM224 series parts (except LM224DR) support 30V maximum. Verify your application's supply voltage requirements against the specific part's maximum rating.
Q: Are there any package variations among the substitute parts?
A: All substitute parts use the 14-SOIC (0.154", 3.90mm Width) surface mount package, maintaining mechanical compatibility with the LM324MX. Packaging options (Tube, Cut Tape & Digi-Reel) vary by supplier but do not affect electrical performance or PCB mounting.
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