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LM324AMX/NOPB Equivalent & Substitute Parts
Part Overview
The LM324AMX/NOPB is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in a 14-SOIC surface mount package. This LinCMOS™ series amplifier operates across a wide supply voltage range of 3V to 32V and is designed for applications requiring low input bias current and moderate bandwidth performance. The part is currently in active production status with substantial inventory availability (36,756 pieces in stock).
Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific operating temperature ranges or performance characteristics better suit application requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Gain Bandwidth Product | 1 MHz | MHz |
| Current - Input Bias | 45 nA | nA |
| Voltage - Input Offset | 2 mV | mV |
| Current - Supply | 1.5 mA | mA |
| Current - Output / Channel | 40 mA | mA |
| Voltage - Supply Span (Min) | 3 V | V |
| Voltage - Supply Span (Max) | 32 V | V |
| Operating Temperature | 0°C to 70°C | °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
Substitution compatibility for the LM324AMX/NOPB is determined by the following critical parameters:
Mandatory Compatibility Criteria:
- Number of circuits: 4 channels
- Package type: 14-SOIC surface mount configuration
- Supply voltage range: Minimum 3V, Maximum 30V or higher
- Amplifier classification: General Purpose
- Mounting type: Surface Mount
Performance Parameters Affecting Substitution:
- Gain Bandwidth Product: 1 MHz or higher
- Current - Input Bias: 45 nA or lower (lower values indicate better performance)
- Voltage - Input Offset: 2 mV or lower
- Current - Output / Channel: 30 mA or higher
- Operating temperature range: Must encompass or exceed 0°C to 70°C
Substitute parts are grouped into two categories: direct functional equivalents with identical or superior electrical characteristics, and alternative manufacturers offering compatible devices with acceptable parameter variations within engineering tolerances.
Parameter Comparison
| Parameter | LM324AMX/NOPB (Main) | LM324ADR (UMW) | LM124DR (TI) | LM224ADR (TI) | LM224D (ST) | LM224DR (UMW) |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | UMW | Texas Instruments | Texas Instruments | STMicroelectronics | UMW |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 |
| Gain Bandwidth Product (MHz) | 1 | — | 1.2 | 1.2 | 1.2 | 1.2 |
| Current - Input Bias (nA) | 45 | 20 | 20 | 15 | 20 | 20 |
| Voltage - Input Offset (mV) | 2 | 2 | 3 | 2 | 2 | 3 |
| Current - Supply (mA) | 1.5 | 1.1 | 1.4 | 1.4 | 1.5 | 0.7 |
| Current - Output / Channel (mA) | 40 | 30 | 30 | 30 | 40 | 30 |
| Voltage - Supply Span Min (V) | 3 | — | 3 | 3 | 3 | 3 |
| Voltage - Supply Span Max (V) | 32 | 30 | 30 | 30 | 30 | 32 |
| Operating Temperature (°C) | 0 to 70 | -30 to 85 | -55 to 125 | -25 to 85 | -40 to 105 | -20 to 85 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Product Status | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Inventory (Pcs) | 36,756 | 181,800 | 171,766 | 133,500 | 4,495 | 105,100 |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Full Compatibility):
LM224ADR (Texas Instruments) is the preferred substitute when the LM324AMX/NOPB is unavailable. This part maintains identical package configuration, RoHS3 compliance, and MSL rating. The LM224ADR demonstrates superior input bias current performance (15 nA versus 45 nA) and operates across an extended temperature range (-25°C to 85°C), encompassing the original part's operating window. Supply voltage compatibility is maintained at 3V to 30V. Current inventory of 133,500 units ensures supply continuity.
LM324ADR (UMW) provides an alternative from a secondary manufacturer with active product status. This device offers improved input bias current (20 nA) and reduced supply current (1.1 mA), supporting applications with stringent power consumption requirements. The maximum supply voltage extends to 30V, and the extended operating temperature range (-30°C to 85°C) accommodates broader environmental conditions. Inventory availability is substantial at 181,800 units.
LM224DR (UMW) is suitable for applications where reduced supply current is critical. This part operates at 700 µA total supply current, representing a 53% reduction compared to the main part. The device maintains 4-circuit configuration and 14-SOIC packaging with active product status. Maximum supply voltage reaches 32V, matching the original specification. Operating temperature range is -20°C to 85°C.
Secondary Substitutes (Active Status, Extended Performance):
LM124DR (Texas Instruments) offers extended operating temperature range (-55°C to 125°C) and higher gain bandwidth product (1.2 MHz) for applications requiring enhanced thermal performance or increased frequency response. This part is in active production with 171,766 units in inventory. The device maintains full package and compliance compatibility.
LM224D (STMicroelectronics) provides active product status with output current capability of 40 mA per channel, matching the original part's output drive capability. Operating temperature range extends to -40°C to 105°C. Inventory availability is limited at 4,495 units.
Obsolete Parts (Not Recommended for New Designs):
LM124D (STMicroelectronics), LM224AD (STMicroelectronics), LM224ADRG4 (Texas Instruments), and LM224KAD (Texas Instruments) carry obsolete or last-time-buy status and should not be selected for new circuit designs. These parts remain available in limited quantities but lack long-term supply assurance.
Frequently Asked Questions (FAQ)
Q: Can LM224ADR directly replace LM324AMX/NOPB in existing designs?
A: Yes. Both devices are 4-circuit general-purpose operational amplifiers in 14-SOIC packages with identical pinout. The LM224ADR operates across 3V to 30V supply range, which encompasses the original part's 3V to 32V specification for most applications. The LM224ADR demonstrates superior input bias current (15 nA versus 45 nA) and maintains RoHS3 compliance and MSL-1 rating. Operating temperature coverage (-25°C to 85°C) includes the original 0°C to 70°C range. No circuit modifications are required.
Q: What is the difference between LM324ADR and LM224ADR?
A: Both are 4-circuit general-purpose amplifiers in 14-SOIC packages from different manufacturers. LM324ADR is manufactured by UMW with 1.1 mA supply current and 20 nA input bias current. LM224ADR is manufactured by Texas Instruments with 1.4 mA supply current and 15 nA input bias current. The LM224ADR offers lower input bias current, while the LM324ADR offers lower total supply current. Both maintain identical package configuration and compliance certifications.
Q: Why does LM224DR have lower supply current than other substitutes?
A: LM224DR (UMW) operates at 700 µA total supply current compared to 1.1 mA to 1.5 mA for other devices. This reduction is achieved through optimized circuit design. The device maintains 4-circuit configuration, 14-SOIC packaging, and 30 mA output current per channel. This part is suitable for battery-powered or low-power applications where supply current minimization is critical.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 Compliant status and MSL-1 (Unlimited) moisture sensitivity rating, matching the original LM324AMX/NOPB specifications. All parts are REACH Unaffected and classified as EAR99 for export control purposes.
Q: What is the maximum supply voltage for substitute parts?
A: The original LM324AMX/NOPB operates at 3V to 32V. Most substitute parts operate at 3V to 30V, which is acceptable for applications not requiring the full 32V maximum. LM224DR (UMW) extends to 32V, matching the original specification exactly. Verify application requirements before selection.
Q: Can LM124DR be used as a substitute despite higher gain bandwidth product?
A: Yes. LM124DR (Texas Instruments) is compatible with 1.2 MHz gain bandwidth product versus the original 1 MHz specification. Higher bandwidth is generally not detrimental in applications designed for 1 MHz operation. The device maintains 4-circuit configuration, 14-SOIC packaging, and extends operating temperature to -55°C to 125°C. This part is suitable for applications requiring enhanced thermal performance.
Q: Which substitute offers the best inventory availability?
A: LM324ADR (UMW) provides the highest inventory with 181,800 units in stock, followed by LM124DR (Texas Instruments) with 171,766 units and LM224ADR (Texas Instruments) with 133,500 units. All three parts maintain active product status and ensure long-term supply continuity.
Q: Should I avoid obsolete parts listed in the substitute group?
A: Yes. Parts marked as Obsolete or Last Time Buy (LM124D, LM224AD, LM224ADRG4, LM224KAD) should not be selected for new designs. These parts have limited remaining inventory and no guaranteed future availability. Select only parts with Active product status for new circuit development.
Q: What is the significance of output type differences (Differential, Push-Pull)?
A: The original LM324AMX/NOPB does not specify output type. LM124DR and LM124D specify Differential output, while LM224DR specifies Push-Pull output. These designations describe internal output stage configuration. All devices are functionally compatible in standard operational amplifier applications. Output type does not affect pinout or basic circuit operation.
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