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LM324DT Equivalent & Substitute Parts
Part Overview
The LM324DT 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 LM324DT remains in active inventory with 405,100 units available, making it suitable for maintenance, repair, and existing production support applications where the specific part number is already established in designs.
Equivalent and substitute parts are necessary when the LM324DT becomes unavailable, when alternative manufacturers are required for supply chain diversification, or when design revisions permit component optimization within the same functional category.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Part Number | LM324DT |
| Amplifier Type | General Purpose |
| Number of Circuits | 4 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Slew Rate | 0.3 V/µs |
| Gain Bandwidth Product | 1.3 MHz |
| Current - Input Bias | 20 nA |
| Voltage - Input Offset | 1 mV |
| Current - Supply | 1 mA |
| Current - Output / Channel | 40 mA |
| Voltage - Supply Span (Min) | 3 V |
| Voltage - Supply Span (Max) | 32 V |
| Operating Temperature | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM324DT is determined by strict alignment of the following critical parameters:
Mandatory Matching Parameters:
- Amplifier Type: General Purpose
- Number of Circuits: 4
- Package / Case: 14-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Current - Input Bias: 20 nA
- Current - Output / Channel: 40 mA
- Voltage - Supply Span (Min): 3 V
- Operating Temperature Range: -40°C minimum to 85°C maximum
Allowable Parameter Variations:
- Slew Rate: 0.3 V/µs or higher
- Gain Bandwidth Product: 1.2 MHz or higher
- Voltage - Input Offset: 1 mV to 3 mV
- Current - Supply: 1 mA to 1.5 mA
- Voltage - Supply Span (Max): 30 V or higher
- Moisture Sensitivity Level: 1 or 3
Substitute parts are grouped into two categories based on output type and operating temperature range:
Category A: General Purpose Output, Standard Temperature Range (-40°C ~ 85°C) Parts with general purpose output configuration and operating temperature range matching or exceeding the LM324DT specification.
Category B: Differential Output, Extended Temperature Range (-55°C ~ 125°C) Parts with differential output configuration and extended operating temperature range. These parts exceed the LM324DT specification and are suitable for applications requiring wider temperature operation.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Number of Circuits | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Span Min (V) | Supply Span Max (V) | Operating Temp (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM324DT | Rohm Semiconductor | General Purpose | 4 | 0.3 | 1.3 | 20 | 1 | 1 | 40 | 3 | 32 | -40 ~ 85 | Not For New Designs |
| AS324AMTR-E1 | Diodes Incorporated | General Purpose | 4 | — | — | 20 | 2 | 1 | 40 | 3 | 36 | -40 ~ 85 | Active |
| AS324AMTR-G1 | Diodes Incorporated | General Purpose | 4 | — | — | 20 | 2 | 1 | 40 | 3 | 36 | -40 ~ 85 | Active |
| AS324MTR-E1 | Diodes Incorporated | General Purpose | 4 | — | — | 20 | 2 | 1 | 40 | 3 | 36 | -40 ~ 85 | Active |
| LM124D | STMicroelectronics | General Purpose | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 30 | 3 | 30 | -55 ~ 125 | Obsolete |
| LM124DG4 | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 ~ 125 | Last Time Buy |
| LM124DR | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 ~ 125 | Active |
| LM124DRG4 | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -55 ~ 125 | Discontinued at DiGi Electronics |
| LM124DT | STMicroelectronics | General Purpose | 4 | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -55 ~ 125 | Active |
| LM224AD | STMicroelectronics | General Purpose | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 30 | 3 | 30 | -40 ~ 105 | Obsolete |
| LM224ADR | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 ~ 85 | Active |
Engineering Selection Recommendations
Primary Substitutes (Active Product Status, Matching Temperature Range)
The AS324AMTR-E1, AS324AMTR-G1, and AS324MTR-E1 manufactured by Diodes Incorporated are direct functional equivalents to the LM324DT. All three parts maintain the 4-circuit general-purpose amplifier configuration, identical input bias current specification (20 nA), matching output current capability (40 mA), and operating temperature range of -40°C to 85°C. These parts are currently in active production status with substantial inventory availability (20,644 to 56,300 units). All three are ROHS3 compliant and REACH unaffected. The primary distinction between these three Diodes Incorporated variants is packaging format: AS324AMTR-E1 and AS324MTR-E1 are supplied in Tape & Reel format with 14-SOIC packaging, while AS324AMTR-G1 is supplied in Tape & Reel format with 14-SO packaging. Moisture sensitivity levels vary between MSL 1 (unlimited) for AS324AMTR-E1 and MSL 3 (168 hours) for AS324AMTR-G1 and AS324MTR-E1.
Secondary Substitutes (Active Product Status, Extended Temperature Range)
The LM124DT manufactured by STMicroelectronics is an active product offering extended operating temperature range (-55°C to 125°C) while maintaining the 4-circuit general-purpose amplifier configuration and matching input bias current (20 nA). The LM124DT provides output current capability of 40 mA, matching the LM324DT specification. This part is suitable for applications requiring operation beyond the standard -40°C to 85°C range. The LM124DT is ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity.
The LM124DR manufactured by Texas Instruments is an active product with extended operating temperature range (-55°C to 125°C). This part maintains the 4-circuit general-purpose amplifier configuration and 20 nA input bias current specification. Output current capability is 30 mA, which is lower than the LM324DT specification of 40 mA. The LM124DR is ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity and has the highest inventory availability (171,766 units) among all substitute options.
Tertiary Substitutes (Limited Availability or Restricted Status)
The LM224ADR manufactured by Texas Instruments is an active product with operating temperature range of -25°C to 85°C, which does not fully match the LM324DT minimum temperature specification of -40°C. This part is suitable only for applications where the minimum operating temperature requirement is -25°C or higher. The LM224ADR provides 30 mA output current per channel, lower than the LM324DT specification. This part is ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity.
The LM124DG4 and LM124DRG4 manufactured by Texas Instruments have restricted availability status (Last Time Buy and Discontinued at DiGi Electronics, respectively) and are not recommended for new applications or long-term supply planning.
The LM124D and LM224AD manufactured by STMicroelectronics are classified as obsolete and are not recommended for new designs or applications requiring long-term component availability.
Frequently Asked Questions (FAQ)
Q: Can the AS324AMTR-E1 directly replace the LM324DT in existing designs?
A: The AS324AMTR-E1 is functionally equivalent to the LM324DT for applications operating within the -40°C to 85°C temperature range. Both parts are 4-circuit general-purpose operational amplifiers in 14-SOIC surface mount packages with matching input bias current (20 nA) and output current capability (40 mA). The primary difference is the input offset voltage specification: the LM324DT specifies 1 mV maximum while the AS324AMTR-E1 specifies 2 mV maximum. This difference is acceptable in most general-purpose amplifier applications. Pin-to-pin compatibility is maintained. Verification of circuit performance is required for applications with tight input offset voltage tolerances.
Q: What is the difference between AS324AMTR-E1, AS324AMTR-G1, and AS324MTR-E1?
A: All three parts are manufactured by Diodes Incorporated and provide identical electrical specifications. The differences are packaging-related: AS324AMTR-E1 and AS324MTR-E1 use 14-SOIC packaging, while AS324AMTR-G1 uses 14-SO packaging. AS324AMTR-E1 has MSL 1 (unlimited) moisture sensitivity, while AS324AMTR-G1 and AS324MTR-E1 have MSL 3 (168 hours) moisture sensitivity. Selection depends on specific packaging requirements and moisture handling procedures in manufacturing.
Q: Why does the LM124DT have a lower output current specification (30 mA) than the LM324DT (40 mA)?
A: The LM124DT is a different product variant within the LM124 family, with different electrical specifications than the LM324DT. While both are 4-circuit general-purpose operational amplifiers, the LM124DT is designed for extended temperature operation (-55°C to 125°C) and has different output stage characteristics. The LM124DT is suitable as a substitute only for applications where the 30 mA output current per channel is sufficient.
Q: Is the LM124DR suitable for applications requiring -40°C minimum operating temperature?
A: Yes. The LM124DR manufactured by Texas Instruments operates from -55°C to 125°C, which exceeds the LM324DT minimum temperature requirement of -40°C. The LM124DR is suitable for applications requiring operation at -40°C or lower. However, the output current specification is 30 mA per channel, compared to the LM324DT specification of 40 mA. Circuit design must accommodate this lower output current capability.
Q: Can I use the LM224ADR as a substitute for the LM324DT?
A: The LM224ADR is not a complete substitute for the LM324DT because its minimum operating temperature is -25°C, which does not meet the LM324DT specification of -40°C minimum. The LM224ADR is suitable only for applications where the minimum operating temperature requirement is -25°C or higher. Additionally, the output current specification is 30 mA per channel, lower than the LM324DT specification of 40 mA.
Q: What is the significance of the "Not For New Designs" status of the LM324DT?
A: The "Not For New Designs" designation indicates that Rohm Semiconductor does not recommend the LM324DT for new product development. This status typically reflects the availability of newer, improved alternatives or the manufacturer's decision to discontinue active promotion of the product. However, the LM324DT remains in production and inventory for maintenance and repair of existing designs. For new designs, selection of an active-status substitute such as the AS324AMTR-E1 or LM124DT is recommended.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the compliance status of the LM324DT. All parts are suitable for applications requiring environmental compliance certification.
Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging?
A: Both Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) are surface mount packaging formats. Cut Tape & Digi-Reel® format provides components on tape that can be cut to specific lengths for smaller quantity orders. Tape & Reel format provides components on continuous tape wound on reels for high-volume production. Selection depends on order quantity and manufacturing equipment compatibility. Electrical specifications are identical between packaging formats.
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