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LM124N Equivalent & Substitute Parts
Part Overview
The LM124N is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit differential output amplifier in a 14-DIP package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance where the LM124N is specified.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Output Type | Differential | — |
| Slew Rate | 0.4 | V/µs |
| Gain Bandwidth Product | 1.3 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 2 | mV |
| Current - Supply | 1.5 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature Range | -55 to 125 | °C |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the LM124N is determined by strict alignment of electrical and mechanical parameters within the general-purpose operational amplifier category. The following criteria establish valid substitution relationships:
Primary Substitution Criteria:
- Amplifier Type: General Purpose
- Number of Circuits: 4
- Package / Case: 14-DIP (0.300", 7.62mm)
- Mounting Type: Through Hole
- Voltage - Supply Span (Min): 3 V
- Voltage - Supply Span (Max): 30 V
Secondary Compatibility Parameters:
- Slew Rate: 0.4 to 0.5 V/µs (acceptable range)
- Gain Bandwidth Product: 1.0 to 1.3 MHz (acceptable range)
- Current - Input Bias: 15 to 45 nA (acceptable range)
- Voltage - Input Offset: 1 to 3 mV (acceptable range)
- Current - Supply: 1.4 to 2.1 mA (acceptable range)
- Current - Output / Channel: 25 to 40 mA (acceptable range)
Substitute parts meeting these criteria maintain functional equivalence for standard general-purpose amplifier applications. Parts with different output types (J-FET, Push-Pull) or supply voltage specifications outside the defined range are listed for reference but represent functional variants rather than direct substitutes.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Number of Circuits | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Input Bias Current (nA) | Input Offset Voltage (mV) | Supply Current (mA) | Output Current / Channel (mA) | Supply Voltage Min (V) | Supply Voltage Max (V) | Operating Temperature (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM124N | STMicroelectronics | General Purpose | 4 | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -55 to 125 | Obsolete |
| LM224N | STMicroelectronics | General Purpose | 4 | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 105 | Obsolete |
| LM224KN | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -25 to 85 | Active |
| LM2902N | STMicroelectronics | General Purpose | 4 | 0.4 | 1.0 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 125 | Obsolete |
| LM324AN/NOPB | Texas Instruments | General Purpose | 4 | — | 1.0 | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | Active |
| LM324KAN | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | 0 to 70 | Active |
| LM324KN | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | 0 to 70 | Active |
| LM324N | Intersil | General Purpose | 4 | — | — | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | Obsolete |
| LM324N/NOPB | Texas Instruments | General Purpose | 4 | — | 1.0 | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | Active |
| LM248N | STMicroelectronics | General Purpose | 4 | 0.5 | 1.3 | 30 | 1 | 2.1 | 25 | 4 | 4 | -40 to 105 | Obsolete |
| LF444ACN/NOPB | Texas Instruments | J-FET | 4 | 1.0 | 1.0 | 0.01 | 2 | 0.6 | 14 | 4 | 4 | 0 to 70 | Active |
Engineering Selection Recommendations
Direct Substitutes (Highest Compatibility):
The LM224N (STMicroelectronics) provides the closest electrical and mechanical match to the LM124N, with identical parameter specifications across all critical performance metrics. Both devices are classified as obsolete, indicating equivalent supply constraints.
The LM2902N (STMicroelectronics) maintains identical electrical characteristics and supply voltage specifications. The primary distinction is output type classification (Push-Pull versus Differential), which does not preclude functional substitution in general-purpose amplifier applications.
Active Product Alternatives:
The LM324KN and LM324KAN (Texas Instruments) are active products offering general-purpose 4-circuit amplifier functionality in 14-DIP packaging. These devices operate within acceptable parameter ranges for slew rate, gain bandwidth product, and supply current. The operating temperature range is restricted to 0°C to 70°C, which represents a narrower specification than the LM124N.
The LM324AN/NOPB and LM324N/NOPB (Texas Instruments) provide active product status with ROHS3 compliance. These devices support the full 3 V to 32 V supply voltage range and maintain 40 mA output current per channel. Slew rate specification is not provided for these variants.
Functional Variants (Limited Substitution):
The LM248N (STMicroelectronics) operates at ±4 V supply voltage specification, which falls outside the standard 3 V to 30 V range of the LM124N. This device is listed as a functional variant for applications requiring symmetric dual-supply operation.
The LF444ACN/NOPB (Texas Instruments) employs J-FET input architecture, resulting in significantly lower input bias current (10 pA versus 20 nA). This device is classified as a functional variant for applications requiring ultra-low input bias current characteristics.
Compliance and Availability:
All recommended substitute parts maintain ROHS3 compliance and EAR99 export classification. The LM324N (Intersil) is noted as RoHS non-compliant and should not be selected for new designs requiring regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can the LM224N directly replace the LM124N in existing designs?
A: Yes. The LM224N provides identical electrical specifications and 14-DIP package configuration. Both devices are classified as obsolete, indicating equivalent supply availability constraints. Design verification is not required for parameter compatibility.
Q: What is the primary difference between the LM124N and LM324 series devices?
A: The LM124N specifies differential output type, while LM324 series devices do not specify output type classification. Both families provide 4-circuit general-purpose amplifier functionality in 14-DIP packaging with compatible supply voltage ranges (3 V to 30 V minimum).
Q: Are the LM324KN and LM324KAN suitable replacements for the LM124N?
A: These devices provide functional substitution with acceptable electrical parameter alignment. The operating temperature range is restricted to 0°C to 70°C, compared to the LM124N specification of -55°C to 125°C. Selection depends on application temperature requirements.
Q: Why is the LF444ACN/NOPB listed as a substitute if it uses J-FET input architecture?
A: The LF444ACN/NOPB is listed as a functional variant, not a direct substitute. It provides 4-circuit amplifier functionality in 14-DIP packaging but operates at ±4 V supply voltage and exhibits significantly different input bias current characteristics (10 pA versus 20 nA). This device is suitable only for applications where J-FET input characteristics provide design advantages.
Q: What compliance certifications should be verified when selecting a substitute part?
A: All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status. The LM324N (Intersil) is noted as RoHS non-compliant and should not be selected for applications requiring regulatory compliance certification.
Q: Does package type affect substitution compatibility?
A: All substitute parts specified in this reference maintain 14-DIP (0.300", 7.62mm) through-hole package configuration. Package type is a mandatory compatibility criterion and is identical across all listed devices.
Q: What is the significance of "Active" versus "Obsolete" product status?
A: Active products are currently manufactured and available through standard distribution channels. Obsolete products have discontinued production and may have limited inventory availability. The LM124N is classified as obsolete; active alternatives include LM324KN, LM324KAN, LM324AN/NOPB, and LM324N/NOPB.
Q: Can the LM2902N be used as a substitute despite different output type classification?
A: Yes. The LM2902N maintains identical electrical specifications and supply voltage range. Output type classification (Push-Pull versus Differential) does not preclude functional substitution in general-purpose amplifier applications where output stage configuration is not a critical design parameter.
Q: What supply voltage range should be verified when selecting a substitute?
A: The LM124N operates across 3 V to 30 V supply voltage range. Most substitute parts maintain this specification. The LM248N and LF444ACN/NOPB operate at ±4 V symmetric supply voltage and should not be selected unless symmetric dual-supply operation is required.
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