LM224NG4 Equivalent & Substitute Parts

Part Overview

The LM224NG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, featuring four independent amplifier circuits in a 14-pin DIP package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The LM224NG4 operates across a wide supply voltage range of 3V to 30V and is suitable for applications requiring moderate bandwidth and low input bias current characteristics.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	LM224NG4	—
Manufacturer	Texas Instruments	—
Number of Circuits	4	—
Amplifier Type	General Purpose	—
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	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-25°C ~ 85°C	—
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LM224NG4 is determined by the following critical parameters: four independent amplifier circuits, general-purpose amplifier classification, 14-pin DIP package format, through-hole mounting, supply voltage range compatibility (minimum 3V, maximum 30V or higher), output current capability (40 mA per channel), and operating temperature range requirements.

Substitute parts are grouped into two categories based on functional and electrical compatibility:

Category 1: Direct Functional Equivalents — Parts that maintain the core electrical specifications of the LM224NG4, including slew rate, gain bandwidth product, input bias current, and supply current characteristics within acceptable operational margins. These parts are suitable for direct replacement in applications where the original performance envelope is required.

Category 2: Compatible Alternatives with Modified Performance — Parts that satisfy the fundamental package, pin count, and supply voltage requirements but exhibit different electrical characteristics such as reduced slew rate, lower gain bandwidth product, or reduced supply current. These parts are suitable for applications where the modified performance parameters remain within system design tolerances.

Parameter Comparison

Parameter	LM224NG4 (TI)	LM224N (STM)	LM324AN (STM)	LM324AN/NOPB (TI)	LM324N (Intersil)	LM324N/NOPB (TI)	LP324N/NOPB (TI)	KA324A (Fairchild)
Number of Circuits	4	4	4	4	4	4	4	4
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Slew Rate (V/µs)	0.5	0.4	0.4	—	—	—	0.05	—
Gain Bandwidth Product (MHz)	1.2	1.3	1	1	—	1	0.1	—
Current - Input Bias (nA)	20	20	20	45	45	45	2	40
Voltage - Input Offset (mV)	3	2	2	2	2	2	2	1.5
Current - Supply (mA)	1.4	1.5	1.5	1.5	1.5	1.5	0.15	1.5
Current - Output / Channel (mA)	40	40	40	40	40	40	10	40
Voltage - Supply Span (Min)	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	30 V	30 V	30 V	32 V	32 V	32 V	32 V	32 V
Operating Temperature	-25°C ~ 85°C	-40°C ~ 105°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP	14-DIP
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitutes (Active Product Status with ROHS3 Compliance)

LM324AN/NOPB (Texas Instruments) and LM324N/NOPB (Texas Instruments) are the recommended primary substitutes for the LM224NG4. Both devices maintain active product status, ensuring long-term availability and manufacturing support. These parts are ROHS3 compliant and feature identical package geometry (14-DIP), mounting type (through-hole), and core electrical specifications including 40 mA output current per channel, 1.5 mA supply current, and 1 MHz gain bandwidth product. The maximum supply voltage rating of 32V exceeds the LM224NG4 specification of 30V, providing additional design margin. Operating temperature range is 0°C to 70°C, which is narrower than the LM224NG4 range of -25°C to 85°C; verification of application temperature requirements is necessary prior to selection.

Secondary Substitutes (Active Product Status)

LP324N/NOPB (Texas Instruments) is an active product with ROHS3 compliance suitable for applications where reduced power consumption is a design priority. This device features significantly lower supply current (150 µA versus 1.4 mA) and reduced output current per channel (10 mA versus 40 mA). The gain bandwidth product is reduced to 100 kHz and slew rate is 0.05 V/µs, representing substantial performance reduction compared to the LM224NG4. This substitute is appropriate only for low-speed, low-power applications where the performance reduction is acceptable.

KA324A (Fairchild Semiconductor) is an active product suitable for applications where RoHS compliance is not a mandatory requirement. This device maintains 40 mA output current per channel and 1.5 mA supply current, with input offset voltage of 1.5 mV, which is superior to the LM224NG4 specification of 3 mV. Operating temperature range is 0°C to 70°C.

Obsolete Alternatives (Not Recommended for New Designs)

LM224N (STMicroelectronics), LM324AN (STMicroelectronics), and LM324N (Intersil) are classified as obsolete products. While these devices exhibit electrical compatibility with the LM224NG4, their obsolete status presents supply chain risk and is unsuitable for new design implementations. These parts may be considered only for legacy system maintenance where no alternative exists.

Frequently Asked Questions (FAQ)

Q: Can LM324AN/NOPB directly replace LM224NG4 in all applications?

A: LM324AN/NOPB is electrically compatible with LM224NG4 in applications operating within the temperature range of 0°C to 70°C. The maximum supply voltage of 32V exceeds the LM224NG4 specification of 30V. Applications requiring operation below 0°C or above 70°C require verification that the narrower temperature range of LM324AN/NOPB is acceptable. All other electrical parameters including output current, supply current, and package geometry are compatible.

Q: What is the difference between LM324AN and LM324AN/NOPB?

A: Both devices are manufactured by Texas Instruments and are electrically identical. The "/NOPB" suffix indicates packaging in tube format. The core electrical specifications, package geometry, and pin configuration are identical. Selection between these variants depends on packaging and handling requirements for production processes.

Q: Why is LP324N/NOPB listed as a substitute if it has significantly lower performance?

A: LP324N/NOPB is included as a substitute for applications where the reduced electrical performance is acceptable and power consumption reduction is a design objective. The device maintains the same package format, pin count, and supply voltage range as the LM224NG4. Applications requiring the full performance envelope of the LM224NG4 (1.2 MHz gain bandwidth product, 0.5 V/µs slew rate, 40 mA output current) should not use LP324N/NOPB.

Q: Are all substitute parts ROHS3 compliant?

A: No. LM324N (Intersil) is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. Applications subject to RoHS compliance requirements must exclude LM324N (Intersil) from component selection.

Q: What is the impact of the 45 nA input bias current in LM324AN/NOPB compared to the 20 nA specification of LM224NG4?

A: The input bias current of LM324AN/NOPB is 2.25 times higher than the LM224NG4. In applications with high source impedance or precision transimpedance configurations, this difference may introduce measurable offset error. Applications with source impedance below 10 kΩ typically experience negligible impact from this parameter difference.

Q: Can KA324A be used in RoHS-regulated applications?

A: KA324A (Fairchild Semiconductor) does not specify RoHS compliance status. Applications subject to RoHS compliance requirements should not use KA324A unless explicit RoHS certification documentation is obtained from the manufacturer.

Q: What is the significance of the 3 mV input offset voltage in LM224NG4 compared to 2 mV in substitute parts?

A: The 1 mV difference in input offset voltage is within typical operational amplifier tolerance and is not significant for most general-purpose applications. Precision applications requiring input offset voltage below 2 mV should verify that the substitute part specification meets the application requirement.

Q: Are all substitute parts available in 14-DIP package format?

A: Yes. All listed substitute parts are available in 14-DIP (0.300", 7.62mm) package format with through-hole mounting. Package geometry and pin spacing are identical across all substitutes, enabling direct mechanical compatibility on printed circuit boards designed for the LM224NG4.

Q: What is the maximum supply voltage difference between LM224NG4 and substitute parts?

A: LM224NG4 specifies a maximum supply voltage of 30V. Most substitute parts (LM324AN/NOPB, LM324N/NOPB, LP324N/NOPB, KA324A) specify 32V maximum. LM224N and LM324AN specify 30V maximum, matching the LM224NG4. Applications operating at supply voltages between 30V and 32V require verification that the substitute part's higher rating is acceptable for the circuit design.

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