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LM324AN Equivalent & Substitute Parts
Part Overview
The LM324AN is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-DIP package. Manufactured by STMicroelectronics, this component operates across a supply voltage range of 3V to 30V with an operating temperature range of 0°C to 70°C. The LM324AN is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for general-purpose amplifier applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| Slew Rate | 0.4 | V/µs |
| Gain Bandwidth Product | 1 | 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 | 0 to 70 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM324AN is determined by electrical and mechanical compatibility across the following critical parameters:
Electrical Compatibility Criteria:
- Amplifier Type: General Purpose classification
- Number of Circuits: Four independent amplifier channels
- Gain Bandwidth Product: 1 MHz nominal
- Supply Voltage Range: Minimum 3V, Maximum 30V or greater
- Input Bias Current: 20 nA nominal
- Voltage Input Offset: 2 mV nominal
- Output Current per Channel: 40 mA nominal
- Slew Rate: 0.4 V/µs nominal
Mechanical Compatibility Criteria:
- Package Type: 14-DIP (0.300", 7.62mm)
- Mounting Type: Through Hole
- Pin Configuration: Identical to LM324AN
Substitute parts are grouped into two categories: direct equivalents that maintain all specified parameters within tolerance, and functional alternatives that provide equivalent performance within acceptable deviations for general-purpose amplifier applications. Parts with extended temperature ranges, improved specifications, or active product status are identified as viable alternatives to the obsolete LM324AN.
Parameter Comparison
| Part Number | Manufacturer | Product Status | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM324AN | STMicroelectronics | Obsolete | 0.4 | 1 | 20 | 2 | 1.5 | 40 | 3 | 30 | 0 to 70 | 14-DIP |
| KA324A | Fairchild Semiconductor | Active | — | — | 40 | 1.5 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-DIP |
| LF444ACN/NOPB | Texas Instruments | Active | 1 | 1 | 0.01 | 2 | 0.6 | 14 | 44 | 44 | 0 to 70 | 14-DIP |
| LM224KN | Texas Instruments | Active | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | -25 to 85 | 14-DIP |
| LM224N | STMicroelectronics | Obsolete | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 105 | 14-DIP |
| LM2902N | STMicroelectronics | Obsolete | 0.4 | 1 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 to 125 | 14-DIP |
| LM324AN/NOPB | Texas Instruments | Active | — | 1 | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-DIP |
| LM324KAN | Texas Instruments | Active | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | 0 to 70 | 14-DIP |
| LM324KN | Texas Instruments | Active | 0.5 | 1.2 | 20 | 3 | 1.4 | 30 | 3 | 30 | 0 to 70 | 14-DIP |
| LM324N | Intersil | Obsolete | — | — | 45 | 2 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-DIP |
Engineering Selection Recommendations
Direct Equivalent (Identical Specifications):
The LM324AN manufactured by STMicroelectronics is directly equivalent to itself. No alternative part maintains identical specifications across all parameters while remaining in active production status.
Active Production Alternatives:
LM324AN/NOPB (Texas Instruments) provides the closest functional equivalent with active product status. This part maintains identical supply voltage range (3V to 32V), gain bandwidth product (1 MHz), input offset voltage (2 mV), output current per channel (40 mA), and operating temperature range (0°C to 70°C). The part is ROHS3 compliant and carries unlimited moisture sensitivity rating. Input bias current specification differs at 45 nA versus 20 nA on the original part.
LM324KAN and LM324KN (Texas Instruments) offer improved specifications with active product status. Both parts feature enhanced slew rate (0.5 V/µs versus 0.4 V/µs), higher gain bandwidth product (1.2 MHz versus 1 MHz), and reduced supply current (1.4 mA versus 1.5 mA). Output current per channel is reduced to 30 mA. These parts maintain the 3V to 30V supply range and 0°C to 70°C operating temperature. LM324KAN specifies 15 nA input bias current; LM324KN specifies 20 nA.
LM224KN (Texas Instruments) provides extended operating temperature range (-25°C to 85°C) with active product status. Electrical specifications align closely with the LM324AN, including 0.5 V/µs slew rate, 1.2 MHz gain bandwidth product, 20 nA input bias current, and 3 mV input offset voltage.
KA324A (Fairchild Semiconductor) maintains active product status with compatible supply voltage range (3V to 32V) and identical output current per channel (40 mA). Input bias current is specified at 40 nA with improved input offset voltage (1.5 mV). Slew rate and gain bandwidth product are not specified.
Functional Alternative with Different Amplifier Type:
LF444ACN/NOPB (Texas Instruments) is a J-FET amplifier alternative with active product status. This part provides significantly lower input bias current (0.01 pA) and higher slew rate (1 V/µs) but operates at fixed supply voltage (44V) and reduced output current per channel (14 mA). This part is suitable only for applications where J-FET characteristics and fixed supply voltage are acceptable.
Compliance and Certification Status:
All recommended active alternatives maintain ROHS3 compliance and REACH unaffected status. The LM324AN/NOPB, LM324KAN, LM324KN, and LM224KN from Texas Instruments carry unlimited moisture sensitivity rating (MSL 1). The KA324A from Fairchild Semiconductor has vendor-undefined moisture sensitivity. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.
Frequently Asked Questions (FAQ)
Q: Can the LM324AN be directly replaced with LM324AN/NOPB?
A: The LM324AN/NOPB from Texas Instruments is functionally compatible as a direct replacement. Both parts maintain identical package configuration (14-DIP), supply voltage range (3V minimum, 30V maximum), gain bandwidth product (1 MHz), input offset voltage (2 mV), output current per channel (40 mA), and operating temperature range (0°C to 70°C). The input bias current specification differs at 45 nA versus 20 nA. This difference is within acceptable tolerance for general-purpose amplifier applications.
Q: What is the difference between LM324KAN and LM324KN?
A: Both parts are manufactured by Texas Instruments with identical electrical performance and active product status. LM324KAN specifies input bias current at 15 nA, while LM324KN specifies 20 nA. Both parts feature 0.5 V/µs slew rate, 1.2 MHz gain bandwidth product, 1.4 mA supply current, and 30 mA output current per channel. Selection between these parts depends on input bias current requirements for the specific application.
Q: Why does LF444ACN/NOPB have different supply voltage specifications?
A: The LF444ACN/NOPB is a J-FET amplifier, fundamentally different from the general-purpose LM324AN. J-FET amplifiers require higher supply voltages (44V fixed) to operate correctly. This part is not a direct substitute but rather a functional alternative for applications requiring extremely low input bias current (0.01 pA) and higher slew rate (1 V/µs). Use this part only when J-FET characteristics are specifically required.
Q: Are all substitute parts ROHS3 compliant?
A: All recommended active alternatives from Texas Instruments (LM324AN/NOPB, LM324KAN, LM324KN, LM224KN) and Fairchild Semiconductor (KA324A) are ROHS3 compliant. The LF444ACN/NOPB from Texas Instruments is also ROHS3 compliant. Obsolete parts (LM224N, LM2902N, LM324N) maintain ROHS3 compliance status where specified.
Q: What is the moisture sensitivity level for these parts?
A: Texas Instruments parts (LM324AN/NOPB, LM324KAN, LM324KN, LM224KN, LF444ACN/NOPB) carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. The Fairchild Semiconductor KA324A has vendor-undefined moisture sensitivity. The obsolete STMicroelectronics parts (LM224N, LM2902N) carry MSL 1 (Unlimited) rating.
Q: Can LM224N be used as a substitute for LM324AN?
A: The LM224N from STMicroelectronics is electrically compatible with the LM324AN, maintaining identical slew rate (0.4 V/µs), input bias current (20 nA), input offset voltage (2 mV), supply current (1.5 mA), output current per channel (40 mA), and supply voltage range (3V to 30V). The LM224N offers extended operating temperature range (-40°C to 105°C) compared to the LM324AN (0°C to 70°C). However, the LM224N is classified as obsolete, making it unsuitable for new production applications requiring active product status.
Q: What is the difference between general-purpose and J-FET amplifier types?
A: General-purpose amplifiers (LM324AN, LM224KN, KA324A) use bipolar input stages with input bias currents in the nanoampere range (10 to 45 nA). J-FET amplifiers (LF444ACN/NOPB) use field-effect transistor input stages with input bias currents in the picoampere range (0.01 pA). J-FET amplifiers provide superior input impedance and lower input bias current but require higher supply voltages and offer reduced output current capability. Selection depends on application requirements for input impedance and bias current characteristics.
Q: Are there any package alternatives to 14-DIP?
A: All substitute parts listed maintain the 14-DIP (0.300", 7.62mm) through-hole package configuration. No surface-mount or alternative package options are provided in this substitution list. If alternative packages are required, additional research beyond this reference is necessary.
Q: What inventory levels are available for active alternatives?
A: Texas Instruments LM324AN/NOPB: 2,514 pieces. Texas Instruments LM324KAN: 2,433 pieces. Texas Instruments LM324KN: 1,540 pieces. Texas Instruments LM224KN: 1,105 pieces. Fairchild Semiconductor KA324A: 1,300 pieces. Texas Instruments LF444ACN/NOPB: 2,200 pieces. Inventory levels are subject to change and should be verified with suppliers for current availability.
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