LM224N Equivalent & Substitute Parts

Part Overview

The LM224N is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a quad amplifier in a 14-DIP package. The device features four independent amplifier circuits suitable for general-purpose applications with a gain-bandwidth product of 1 MHz and a supply voltage range of 3 V to 32 V. The LM224N is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Active alternatives with comparable or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	LM224N (onsemi)
Amplifier Type	General Purpose
Number of Circuits	4
Gain Bandwidth Product	1 MHz
Current - Input Bias	40 nA
Voltage - Input Offset	1.5 mV
Current - Supply	1 mA
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	-25°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM224N is determined by the following critical parameters: amplifier type (general purpose), number of circuits (4), package type (14-DIP through-hole), and electrical compatibility within the supply voltage range and operating temperature specifications. Substitute parts must maintain the same physical package footprint to ensure mechanical compatibility with existing printed circuit board designs.

The substitute parts are grouped into two categories:

Direct Substitutes (General Purpose Amplifiers): Parts that maintain the general-purpose amplifier classification with four circuits in 14-DIP packaging. These include the LM224KN, LM224AN, LM224KAN, LM324AN, LM324AN/NOPB, LM324KAN, and LM324KN. These devices share the same amplifier topology and are pin-compatible with the LM224N.

Similar Substitutes (J-FET Amplifiers): Parts that employ J-FET input stages (LF347BN/NOPB and LF444ACN/NOPB) rather than standard CMOS or bipolar inputs. These devices provide enhanced input impedance characteristics and lower input bias current but operate within compatible supply voltage ranges and package configurations.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Gain Bandwidth Product	Current - Input Bias	Voltage - Input Offset	Current - Supply	Current - Output / Channel	Voltage - Supply Span (Min)	Voltage - Supply Span (Max)	Operating Temperature	Product Status	RoHS Status
LM224N	onsemi	General Purpose	1 MHz	40 nA	1.5 mV	1 mA	40 mA	3 V	32 V	-25°C ~ 85°C	Obsolete	RoHS non-compliant
LM224KN	Texas Instruments	General Purpose	1.2 MHz	20 nA	3 mV	1.4 mA	30 mA	3 V	30 V	-25°C ~ 85°C	Active	ROHS3 Compliant
LM224AN	STMicroelectronics	General Purpose	1.3 MHz	20 nA	2 mV	1.5 mA	30 mA	3 V	30 V	-40°C ~ 105°C	Obsolete	ROHS3 Compliant
LM224KAN	Texas Instruments	General Purpose	1.2 MHz	15 nA	2 mV	1.4 mA	30 mA	3 V	30 V	-25°C ~ 85°C	Active	ROHS3 Compliant
LM324AN	STMicroelectronics	General Purpose	1 MHz	20 nA	2 mV	1.5 mA	40 mA	3 V	30 V	0°C ~ 70°C	Obsolete	ROHS3 Compliant
LM324AN/NOPB	Texas Instruments	General Purpose	1 MHz	45 nA	2 mV	1.5 mA	40 mA	3 V	32 V	0°C ~ 70°C	Active	ROHS3 Compliant
LM324KAN	Texas Instruments	General Purpose	1.2 MHz	15 nA	2 mV	1.4 mA	30 mA	3 V	30 V	0°C ~ 70°C	Active	ROHS3 Compliant
LM324KN	Texas Instruments	General Purpose	1.2 MHz	20 nA	3 mV	1.4 mA	30 mA	3 V	30 V	0°C ~ 70°C	Active	ROHS3 Compliant
LF347BN/NOPB	Texas Instruments	J-FET	4 MHz	50 pA	3 mV	7.2 mA	Not specified	36 V	36 V	0°C ~ 70°C	Active	ROHS3 Compliant
LF444ACN/NOPB	Texas Instruments	J-FET	1 MHz	10 pA	2 mV	600 µA	14 mA	44 V	44 V	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

The LM224KN (Texas Instruments) and LM224KAN (Texas Instruments) are the primary recommended direct substitutes. Both devices are active products with ROHS3 compliance, maintain the same 14-DIP package configuration, and operate within the -25°C to 85°C temperature range matching the original LM224N specification. The LM224KN provides identical electrical performance with a 1.2 MHz gain-bandwidth product and 30 mA output current per channel. The LM224KAN offers enhanced input bias current performance (15 nA) while maintaining compatibility.

For Extended Temperature Range Applications:

The LM224AN (STMicroelectronics) extends the operating temperature range to -40°C to 105°C, providing broader environmental coverage. Although classified as obsolete, this part maintains ROHS3 compliance and offers improved thermal performance characteristics.

For Supply Voltage Compatibility:

The LM324AN/NOPB (Texas Instruments) maintains the full 3 V to 32 V supply voltage range of the original LM224N while providing active product status and ROHS3 compliance. This part is suitable for applications requiring the extended upper supply voltage limit.

For Enhanced Input Impedance Requirements:

The LF444ACN/NOPB (Texas Instruments) provides J-FET input characteristics with exceptionally low input bias current (10 pA) and reduced supply current (600 µA total). This device is appropriate for applications requiring high input impedance and low power consumption, though it operates within a fixed 44 V supply voltage range and 0°C to 70°C temperature window.

All recommended active substitutes maintain through-hole mounting compatibility and 14-DIP package footprints, ensuring direct board-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the LM224N be directly replaced with the LM324 series?

A: Yes. The LM324AN and LM324KAN are pin-compatible general-purpose quad amplifiers in 14-DIP packages. Both maintain the 3 V minimum supply voltage and operate within overlapping temperature ranges. The LM324AN/NOPB preserves the full 32 V maximum supply voltage specification of the original LM224N.

Q: What is the primary difference between the LM224 and LM324 series?

A: Both series are general-purpose quad amplifiers with identical pin configurations and package types. The LM324 series represents a later generation with improved specifications in certain parameters such as input bias current and gain-bandwidth product. Electrical performance is functionally equivalent for most general-purpose applications.

Q: Are the J-FET alternatives (LF347BN/NOPB and LF444ACN/NOPB) suitable for all applications?

A: J-FET input amplifiers provide superior input impedance and significantly lower input bias current compared to standard CMOS or bipolar designs. However, they operate within different supply voltage ranges (36 V and 44 V fixed, respectively) and narrower temperature ranges (0°C to 70°C). These devices are suitable only for applications where high input impedance is a design requirement and the supply voltage and temperature specifications are compatible.

Q: What is the impact of RoHS compliance on part selection?

A: The original LM224N is RoHS non-compliant. All recommended active substitutes (LM224KN, LM224KAN, LM324AN/NOPB, LM324KAN, LM324KN, LF347BN/NOPB, and LF444ACN/NOPB) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Q: Can the LM224N be used in applications requiring extended temperature operation?

A: The LM224N operates within -25°C to 85°C. For extended temperature ranges, the LM224AN (STMicroelectronics) provides -40°C to 105°C operation, though it is classified as obsolete. For active products with extended temperature capability, the LM224KN and LM224KAN maintain the -25°C to 85°C range of the original device.

Q: What are the packaging considerations for through-hole mounting?

A: All substitute parts listed maintain the 14-DIP (0.300", 7.62mm) through-hole package configuration. Direct board-level substitution is possible without layout modifications. Verify component lead spacing and hole diameter compatibility with existing printed circuit board designs before procurement.

Q: How do supply current specifications affect device selection?

A: The original LM224N draws 1 mA total supply current. The LM224KN and LM224KAN increase this to 1.4 mA per channel (5.6 mA total for four channels). The LF444ACN/NOPB significantly reduces supply current to 600 µA total, making it suitable for battery-powered or low-power applications. Verify power supply capacity and thermal dissipation requirements for the selected substitute.

Q: Are there pin-compatibility concerns when substituting between general-purpose and J-FET amplifiers?

A: All devices listed maintain identical 14-DIP pin configurations and are mechanically interchangeable. However, J-FET input amplifiers exhibit different electrical characteristics, particularly input impedance and bias current behavior. Verify circuit performance through simulation or testing before production implementation, as application-specific biasing networks may require adjustment.

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