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LM124D Equivalent & Substitute Parts
Part Overview
The LM124D is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit differential output device in 14-SOIC surface mount packaging. This part is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (1525 pcs). The LM124D operates across a wide supply voltage range (3V to 30V) and temperature range (-55°C to 125°C), making it suitable for industrial and extended-temperature applications. Due to its Last Time Buy status, equivalent substitute parts with Active product status are necessary for long-term design continuity and procurement reliability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Output Type | Differential | — |
| Slew Rate | 0.5 | V/µs |
| Gain Bandwidth Product | 1.2 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply (x4 Channels) | 1.4 | mA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | -55 to 125 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the LM124D is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Number of Circuits: 4 (mandatory)
- Amplifier Type: General Purpose (mandatory)
- Package / Case: 14-SOIC surface mount (mandatory for PCB compatibility)
- Voltage - Supply Span: Minimum 3V, Maximum ≥30V (mandatory for supply compatibility)
- Operating Temperature Range: Must encompass or exceed -55°C to 125°C for industrial applications
- Slew Rate: 0.5V/µs or higher (performance parameter)
- Gain Bandwidth Product: 1.2 MHz or higher (performance parameter)
- Current - Input Bias: 20 nA or lower (performance parameter)
- Current - Output / Channel: 30 mA or higher (performance parameter)
Substitution Groups:
Group 1 - Direct Electrical & Mechanical Match (Highest Compatibility): LM124DR meets all primary criteria with identical electrical specifications and packaging. Product Status is Active, ensuring long-term availability.
Group 2 - Compatible with Extended Temperature Range: LM2902DR (Rohm Semiconductor) provides 4-circuit general-purpose amplification in 14-SOIC packaging with supply voltage range 3V to 32V. Operating temperature -40°C to 125°C covers the upper industrial range. Slew Rate 0.3V/µs and Gain Bandwidth Product 1.2 MHz are within acceptable performance parameters. Product Status is Obsolete; use only when LM124D and Group 1 alternatives are unavailable.
Group 3 - Commercial Temperature Range Substitutes: LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB (Texas Instruments LinCMOS™ series) provide 4-circuit general-purpose amplification in 14-SOIC packaging with supply voltage range 3V to 32V. Operating temperature 0°C to 70°C is restricted to commercial range. Gain Bandwidth Product 1 MHz is lower than LM124D. These parts are suitable only for applications not requiring extended temperature operation below 0°C or above 70°C.
Group 4 - Low-Power Alternatives: LP324M/NOPB and LP324MX/NOPB (Texas Instruments) provide 4-circuit general-purpose amplification in 14-SOIC packaging with significantly reduced power consumption (85µA supply current vs. 1.4mA). Gain Bandwidth Product 100 kHz and Slew Rate 0.05V/µs represent substantial performance reduction. Operating temperature 0°C to 70°C is commercial range only. These parts are suitable only for power-constrained applications not requiring high-speed performance.
Group 5 - Alternative Manufacturer Options: BA10324AF-E2 and BA2902F-E2 (Rohm Semiconductor) provide 4-circuit general-purpose amplification in 14-SOP packaging (0.173" width vs. 0.154" for LM124D). Supply voltage range 3V to 32V is compatible. Slew Rate 0.2-0.2V/µs and Gain Bandwidth Product 500 kHz represent reduced performance. Package width difference requires PCB layout verification. These parts are suitable when Rohm Semiconductor supply chain is preferred and package footprint adjustment is feasible.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package Width (mm) |
|---|---|---|---|---|---|---|---|---|---|
| LM124D | Texas Instruments | Last Time Buy | 0.5 | 1.2 | 20 | 3 | 30 | -55 to 125 | 3.90 |
| LM124DR | Texas Instruments | Active | 0.5 | 1.2 | 20 | 3 | 30 | -55 to 125 | 3.90 |
| LM2902DR | Rohm Semiconductor | Obsolete | 0.3 | 1.2 | 20 | 3 | 32 | -40 to 125 | 3.90 |
| LM324AM/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 3 | 32 | 0 to 70 | 3.90 |
| LM324AMX/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 3 | 32 | 0 to 70 | 3.90 |
| LM324M/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 3 | 32 | 0 to 70 | 3.90 |
| LM324MX/NOPB | Texas Instruments | Active | — | 1.0 | 45 | 3 | 32 | 0 to 70 | 3.90 |
| LP324M/NOPB | Texas Instruments | Active | 0.05 | 0.1 | 2 | 3 | 32 | 0 to 70 | 3.90 |
| LP324MX/NOPB | Texas Instruments | Active | 0.05 | 0.1 | 2 | 3 | 32 | 0 to 70 | 3.90 |
| BA10324AF-E2 | Rohm Semiconductor | Active | 0.2 | 0.5 | 20 | 3 | 32 | -40 to 85 | 4.40 |
| BA2902F-E2 | Rohm Semiconductor | Active | 0.2 | 0.5 | 20 | 3 | 32 | -40 to 125 | 4.40 |
Engineering Selection Recommendations
For Industrial Extended-Temperature Applications (-55°C to 125°C):
LM124DR is the primary recommended substitute. It is manufactured by Texas Instruments with Active product status, ensuring continuous availability and supply chain stability. Electrical specifications are identical to LM124D across all parameters: Slew Rate 0.5V/µs, Gain Bandwidth Product 1.2 MHz, Input Bias Current 20 nA, and supply voltage range 3V to 30V. Package dimensions (14-SOIC, 3.90mm width) are identical, requiring no PCB layout modification. RoHS3 compliance and MSL Level 1 certification match the original part. This substitution requires no design verification.
For Industrial Applications with Lower Temperature Limit of -40°C:
LM2902DR (Rohm Semiconductor) is acceptable when LM124DR is unavailable. Operating temperature range -40°C to 125°C covers industrial applications not requiring operation below -40°C. Electrical specifications are compatible: Slew Rate 0.3V/µs (lower than LM124D but within general-purpose amplifier range), Gain Bandwidth Product 1.2 MHz (identical), Input Bias Current 20 nA (identical), and supply voltage range 3V to 32V (compatible). Package dimensions are identical. Product Status is Obsolete; procurement should be limited to immediate requirements only. RoHS3 compliance and MSL Level 1 certification are maintained.
For Commercial Temperature Applications (0°C to 70°C):
LM324AMX/NOPB or LM324MX/NOPB (Texas Instruments LinCMOS™ series) are acceptable substitutes when extended temperature operation is not required. These parts have Active product status with high inventory availability (36,756 and 50,513 pcs respectively). Operating temperature range 0°C to 70°C is restricted to commercial applications. Electrical specifications differ: Gain Bandwidth Product 1.0 MHz (lower than LM124D), Input Bias Current 45 nA (higher than LM124D). Supply voltage range 3V to 32V is compatible. Package dimensions are identical. These substitutions are suitable only for applications operating within 0°C to 70°C temperature range.
For Power-Constrained Applications:
LP324MX/NOPB (Texas Instruments) is suitable only when power consumption is the primary design constraint and performance reduction is acceptable. Supply current is 85µA (vs. 1.4mA for LM124D), representing 94% power reduction. Operating temperature range 0°C to 70°C is commercial only. Gain Bandwidth Product 100 kHz and Slew Rate 0.05V/µs represent substantial performance reduction unsuitable for high-speed signal processing. This substitution requires full circuit performance re-evaluation.
For Alternative Manufacturer Preference:
BA2902F-E2 (Rohm Semiconductor) provides 4-circuit general-purpose amplification with Active product status and extended temperature range -40°C to 125°C. Package width 4.40mm (vs. 3.90mm for LM124D) requires PCB footprint verification and potential layout modification. Electrical specifications differ: Slew Rate 0.2V/µs and Gain Bandwidth Product 500 kHz represent reduced performance. This substitution is acceptable only when Rohm Semiconductor supply chain is preferred and package footprint adjustment is feasible.
Frequently Asked Questions (FAQ)
Q1: Can LM124D be directly replaced with LM124DR without design changes?
A: Yes. LM124DR is the direct substitute with identical electrical specifications, package dimensions, and operating temperature range. No design verification is required. Both parts are manufactured by Texas Instruments, are RoHS3 compliant, and have MSL Level 1 certification. The only difference is packaging format (Tube vs. Cut Tape & Digi-Reel®), which does not affect circuit performance.
Q2: Why is LM2902DR listed as Obsolete if it is a substitute?
A: LM2902DR meets the electrical and mechanical substitution criteria (4-circuit general-purpose amplifier, 14-SOIC package, compatible supply voltage and temperature range). However, Obsolete product status indicates discontinued manufacturing. It is listed as a substitute only for applications where LM124D and Active alternatives are unavailable. Procurement of Obsolete parts should be limited to immediate requirements only, as future availability cannot be guaranteed.
Q3: Can LM324 series parts replace LM124D in all applications?
A: No. LM324 series parts (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) have restricted operating temperature range 0°C to 70°C, unsuitable for industrial applications requiring -55°C to 125°C operation. Additionally, Gain Bandwidth Product is 1.0 MHz (vs. 1.2 MHz for LM124D) and Input Bias Current is 45 nA (vs. 20 nA for LM124D). These parts are suitable only for commercial-temperature applications where performance reduction is acceptable.
Q4: What is the impact of package width difference between LM124D (3.90mm) and BA10324AF-E2 / BA2902F-E2 (4.40mm)?
A: Package width difference of 0.50mm requires PCB footprint verification. If the original PCB layout has tight spacing constraints, the wider package may not fit without layout modification. BA10324AF-E2 and BA2902F-E2 are suitable substitutes only when PCB footprint adjustment is feasible. Verify pad spacing and adjacent component clearance before substitution.
Q5: Is LP324MX/NOPB suitable as a general replacement for LM124D?
A: No. LP324MX/NOPB is a low-power variant with 85µA supply current (vs. 1.4mA for LM124D), Gain Bandwidth Product 100 kHz (vs. 1.2 MHz), and Slew Rate 0.05V/µs (vs. 0.5V/µs). These specifications represent substantial performance reduction unsuitable for general-purpose amplification applications requiring higher bandwidth and slew rate. LP324MX/NOPB is suitable only for power-constrained applications where reduced performance is acceptable and operating temperature is restricted to 0°C to 70°C.
Q6: What compliance certifications are maintained across all substitute parts?
A: All substitute parts listed maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. REACH Status is Unaffected for all parts. ECCN classification is EAR99 for all parts. These certifications ensure regulatory compliance across industrial and commercial applications.
Q7: Which substitute part has the highest inventory availability?
A: LP324MX/NOPB has the highest inventory availability at 23,900 pcs. LM124DR has 171,766 pcs available. For immediate procurement needs, both parts offer substantial inventory. However, LM124DR is the recommended choice due to identical electrical specifications and extended temperature range support.
Q8: Can substitute parts be mixed in the same design?
A: Mixing substitute parts from different groups (e.g., LM124DR with LM324MX/NOPB) in the same circuit is not recommended without circuit-level analysis. Different electrical specifications (Slew Rate, Gain Bandwidth Product, Input Bias Current) may result in inconsistent circuit behavior, offset errors, or frequency response variations. If multiple op-amp channels are required, use identical part numbers throughout the design.
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