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LM224N Equivalent & Substitute Parts
Part Overview
The LM224N is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-DIP package. This component is classified as obsolete, though 27,550 units remain in current inventory. The LM224N operates across a wide supply voltage range (3V to 30V) and temperature range (-40°C to 105°C), making it suitable for legacy applications requiring general-purpose amplification.
Due to its obsolete product status, identifying equivalent and substitute parts is necessary for design continuity, long-term sourcing reliability, and new production planning. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.
Substiute Parts
Key Parameters
| Parameter | LM224N Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| 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 | -40 to 105 | °C |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the LM224N is determined by the following critical parameters:
Primary Compatibility Criteria:
- Number of circuits: 4 (quad configuration required)
- Package type: 14-DIP through-hole mounting
- Amplifier type: General Purpose
- Supply voltage range: Minimum 3V, Maximum 30V
- Operating temperature range: Must encompass or exceed -40°C to 105°C
- Slew rate: 0.4 V/µs or greater
- Gain bandwidth product: 1.3 MHz or greater
- Output current per channel: 40 mA or greater
- Input bias current: 20 nA or less
- Input offset voltage: 2 mV or less
Substitute parts are grouped into two categories:
Category 1: Direct Functional Equivalents (Same Base Product Number) Parts sharing the LM224 base product number with identical electrical specifications but different temperature grades or manufacturers. These include LM224AN, LM224KAN, and LM224KN.
Category 2: Cross-Functional Alternatives (Different Base Product Numbers) Parts with different base product numbers but meeting or exceeding all critical electrical and mechanical parameters. These include LM2902N, LM324AN/NOPB, LM324KAN, and LM324KN.
Category 3: Specialized Alternatives (Different Amplifier Type) Parts with alternative amplifier architectures (J-FET) that meet package and circuit count requirements but differ in input bias current characteristics. This includes LF444ACN/NOPB.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM224N | STMicroelectronics | Obsolete | General Purpose | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 105 | 14-DIP |
| LM224AN | STMicroelectronics | Obsolete | General Purpose | 0.4 | 1.3 | 20 | 2 | 1.5 | 30 | 3 | 30 | -40 to 105 | 14-DIP |
| LM224KAN | Texas Instruments | Active | General Purpose | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 to 85 | 14-DIP |
| LM224KN | Texas Instruments | Active | General Purpose | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -25 to 85 | 14-DIP |
| LM2902N | STMicroelectronics | Obsolete | General Purpose | 0.4 | 1.0 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 125 | 14-DIP |
| LM324AN/NOPB | Texas Instruments | Active | General Purpose | — | 1.0 | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-DIP |
| LM324KAN | Texas Instruments | Active | General Purpose | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | 0 to 70 | 14-DIP |
| LM324KN | Texas Instruments | Active | General Purpose | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | 0 to 70 | 14-DIP |
| LM248N | STMicroelectronics | Obsolete | General Purpose | 0.5 | 1.3 | 30 | 1 | 2.1 | 25 | 44 | 44 | -40 to 105 | 14-DIP |
| LF444ACN/NOPB | Texas Instruments | Active | J-FET | 1.0 | 1.0 | 0.01 | 2 | 0.6 | 14 | 44 | 44 | 0 to 70 | 14-DIP |
Engineering Selection Recommendations
For Direct Replacement (Same Base Product Number):
LM224KAN and LM224KN are active-status alternatives from Texas Instruments sharing the LM224 base product number. Both maintain the 14-DIP package and 4-circuit configuration. LM224KAN offers superior input bias current (15 nA) and is recommended for applications where low input bias is critical. LM224KN maintains the original 20 nA input bias specification. Both operate at reduced temperature range (0°C to 70°C or -25°C to 85°C) compared to the LM224N (-40°C to 105°C), requiring verification against application temperature requirements.
For Extended Temperature Range:
LM2902N maintains the full -40°C to 125°C operating range of the LM224N with identical electrical specifications and output current capability (40 mA). This part is suitable for applications requiring the extended low-temperature performance of the original LM224N. LM2902N is classified as obsolete but maintains current inventory (8,041 units).
For Active Product Status:
LM324AN/NOPB and LM324KAN/LM324KN are active-status general-purpose amplifiers from Texas Instruments. LM324AN/NOPB provides the highest output current (40 mA) and supply voltage range (3V to 32V) among active alternatives. LM324KAN and LM324KN offer improved slew rate (0.5 V/µs) and lower supply current (1.4 mA) but reduced output current (30 mA) and narrower operating temperature range (0°C to 70°C).
For Specialized Applications (Low Input Bias Current):
LF444ACN/NOPB is a J-FET amplifier offering extremely low input bias current (10 pA) compared to the LM224N (20 nA). This part is suitable for high-impedance signal conditioning applications. However, LF444ACN/NOPB operates at fixed ±22V supply (44V span) and reduced output current (14 mA), requiring circuit redesign for compatibility.
Compliance Considerations:
All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the LM224N certification profile. All parts are classified under HTSUS 8542.33.0001 and ECCN EAR99.
Frequently Asked Questions (FAQ)
Q: Can LM224KAN or LM224KN directly replace LM224N in existing designs?
A: LM224KAN and LM224KN are pin-compatible and functionally equivalent for most applications. Both maintain the 14-DIP package, 4-circuit configuration, and general-purpose amplifier type. However, the operating temperature range is reduced from -40°C to 105°C (LM224N) to -25°C to 85°C (LM224KAN) or 0°C to 70°C (LM224KN). Verify that your application does not require operation below -25°C or above 85°C before substitution.
Q: What is the difference between LM224KAN and LM224KN?
A: Both parts are from Texas Instruments with identical package, circuit count, and temperature range. LM224KAN specifies 15 nA input bias current and 2 mV input offset voltage. LM224KN specifies 20 nA input bias current and 3 mV input offset voltage. LM224KAN is preferred for applications sensitive to input bias current variations.
Q: Is LM2902N a suitable replacement for LM224N?
A: LM2902N is functionally equivalent with identical slew rate (0.4 V/µs), supply current (1.5 mA), and output current (40 mA). LM2902N extends the operating temperature range to -40°C to 125°C, providing superior low-temperature performance. The primary difference is output type classification (Push-Pull for LM2902N versus unspecified for LM224N). LM2902N is suitable for applications requiring extended temperature range.
Q: Why does LF444ACN/NOPB have such different electrical specifications?
A: LF444ACN/NOPB uses J-FET input architecture, resulting in extremely low input bias current (10 pA versus 20 nA). This architecture requires fixed ±22V supply operation (44V span) and reduces output current to 14 mA. J-FET amplifiers are optimized for high-impedance signal sources where input bias current must be minimized. LF444ACN/NOPB is not a direct replacement but an alternative for specialized applications.
Q: Can I use LM324AN/NOPB as a substitute?
A: LM324AN/NOPB is pin-compatible and maintains the 14-DIP package and 4-circuit configuration. However, it specifies higher input bias current (45 nA versus 20 nA) and does not specify slew rate. LM324AN/NOPB is suitable for general-purpose applications where input bias current is not critical. The operating temperature range is reduced to 0°C to 70°C.
Q: What is the inventory status of substitute parts?
A: LM224KAN (1,425 units), LM224KN (1,105 units), LM324AN/NOPB (2,514 units), LM324KAN (2,433 units), and LM324KN (1,540 units) are all active-status parts with current inventory. LM2902N (8,041 units) and LM248N (1,569 units) are obsolete but maintain inventory. The original LM224N has the highest inventory (27,550 units).
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the LM224N certification profile. All parts are suitable for applications requiring environmental compliance certification.
Q: What package options are available?
A: All substitute parts maintain the 14-DIP (0.300", 7.62mm) through-hole package format. No surface-mount alternatives are included in this reference. Mounting type is through-hole for all listed parts.
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