LM324PT Equivalent & Substitute Parts

Part Overview

The LM324PT is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit device in a 14-TSSOP surface mount package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. The LM324PT operates across a wide supply voltage range of 3V to 32V and maintains functionality across industrial temperature ranges from -40°C to 85°C. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.3	V/µs
Gain Bandwidth Product	800	kHz
Current - Input Bias	20	nA
Voltage - Input Offset	1	mV
Current - Supply	1	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 85	°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324PT is determined by strict alignment of electrical and mechanical parameters within the general-purpose operational amplifier category. The critical parameters governing substitution eligibility are:

Mechanical Compatibility:

Package type: 14-TSSOP surface mount configuration
Physical dimensions: 0.173" width, 4.40mm width specification
Mounting type: Surface mount

Electrical Compatibility:

Number of circuits: 4-channel configuration
Amplifier type: General Purpose classification
Supply voltage range: Minimum 3V, Maximum 30V or higher
Operating temperature range: Minimum -40°C, Maximum 85°C or higher
Input bias current: 20nA or lower
Input offset voltage: 1mV to 3mV range
Output current per channel: 30mA or higher
Slew rate: 0.3V/µs or higher
Gain bandwidth product: 800kHz or higher

Compliance Requirements:

RoHS3 compliance
Moisture Sensitivity Level 1
REACH unaffected status

Substitute parts must satisfy all mechanical requirements and meet or exceed the electrical performance specifications of the LM324PT. Parts with enhanced specifications (higher slew rate, greater bandwidth, lower input offset voltage) are acceptable substitutes provided they maintain backward compatibility with the original design constraints.

Parameter Comparison

Parameter	LM324PT (Main)	LM224DTBR2G	LM224PT	LMV324IPT	MC3303PT	TL064IPWR	LM224APT	LM2902AWYPT	LM2902DTBR2G	LM2902KAVQPWR	LM2902KAVQPWRG4Q1
Manufacturer	Rohm	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics	Texas Instruments	STMicroelectronics	STMicroelectronics	onsemi	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Slew Rate (V/µs)	0.3	—	0.4	0.45	0.5	3.5	0.4	0.4	—	0.5	0.5
Gain Bandwidth Product (kHz)	800	1000	1300	1300	1000	1000	1300	1300	1000	1200	1200
Current - Input Bias (nA)	20	90	20	16	40	0.03	20	20	90	20	20
Voltage - Input Offset (mV)	1	2	2	0.1	1	3	2	2	2	3	3
Current - Output / Channel (mA)	30	40	40	160	30	20	40	40	40	30	60
Voltage - Supply Span Min (V)	3	3	3	2.7	3	10	3	3	3	3	3
Voltage - Supply Span Max (V)	32	32	30	6	36	30	30	30	32	30	32
Operating Temperature (°C)	-40 to 85	-25 to 85	-40 to 105	-40 to 125	-40 to 105	-40 to 85	-40 to 105	-40 to 125	-40 to 105	-40 to 125	-40 to 125
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The LM224PT, LM224APT, and LM224DTBR2G represent the most direct substitutes for the LM324PT. These parts maintain identical 4-circuit general-purpose amplifier architecture in 14-TSSOP packaging with supply voltage ranges of 3V to 30V or 32V. All three parts are manufactured by active suppliers (STMicroelectronics and onsemi) with active product status, ensuring long-term availability. These substitutes provide enhanced gain bandwidth product (1.3MHz or 1MHz versus 800kHz) and improved slew rate specifications while maintaining input bias current at 20nA and input offset voltage within acceptable ranges. Operating temperature ranges extend to 105°C, exceeding the original -40°C to 85°C specification.

Secondary Substitutes (Enhanced Performance):

The LM2902KAVQPWR and LM2902KAVQPWRG4Q1 from Texas Instruments provide automotive-grade qualification (AEC-Q100) with extended operating temperature to 125°C. These parts maintain general-purpose amplifier functionality with 1.2MHz gain bandwidth product and 0.5V/µs slew rate. The LM2902KAVQPWRG4Q1 offers increased output current capability (60mA per channel) and extended supply voltage maximum (32V) while maintaining 3V minimum supply voltage. Both parts are ROHS3 compliant with MSL 1 rating.

Specialized Substitutes (Application-Dependent):

The LMV324IPT from STMicroelectronics features rail-to-rail output capability with significantly enhanced output current (160mA per channel) and lower input offset voltage (100µV). This part operates across a reduced supply voltage range (2.7V to 6V) and is suitable for low-voltage applications requiring higher output drive capability. The MC3303PT from STMicroelectronics provides extended supply voltage range to 36V maximum with 1MHz gain bandwidth product and 0.5V/µs slew rate, suitable for high-voltage applications.

Alternative Technology (J-FET Input):

The TL064IPWR from Texas Instruments represents a J-FET input amplifier technology with significantly lower input bias current (30pA versus 20nA) and higher slew rate (3.5V/µs). This part requires minimum 10V supply voltage and is suitable for applications requiring ultra-low input bias current. This substitute is appropriate only when J-FET input characteristics are compatible with circuit design requirements.

Availability and Compliance:

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. Active product status ensures ongoing availability from multiple manufacturers. The LM2902KAVQPWRG4Q1 carries Last Time Buy status, indicating planned discontinuation; designs requiring long-term production continuity should prioritize LM224PT, LM224APT, or LM2902KAVQPWR.

Frequently Asked Questions (FAQ)

Q: Can the LM224PT directly replace the LM324PT without circuit modification?

A: Yes. The LM224PT maintains identical pinout, 4-circuit configuration, and 14-TSSOP package dimensions. Supply voltage range (3V to 30V) and operating temperature range (-40°C to 105°C) are compatible with the LM324PT specifications. Enhanced electrical performance (1.3MHz bandwidth versus 800kHz, 0.4V/µs slew rate versus 0.3V/µs) provides improved performance margins without requiring design changes.

Q: What is the difference between LM2902 and LM224 series substitutes?

A: Both LM2902 and LM224 series are general-purpose 4-circuit operational amplifiers in 14-TSSOP packaging. The LM2902 series offers automotive-grade qualification options (AEC-Q100) with extended temperature ranges to 125°C. The LM224 series provides standard industrial-grade performance with temperature ranges to 105°C. Selection depends on application requirements for automotive qualification and temperature operating range.

Q: Is the LMV324IPT suitable as a substitute for the LM324PT?

A: The LMV324IPT is a functional substitute only for applications compatible with its reduced supply voltage range (2.7V to 6V maximum). The original LM324PT operates to 32V maximum supply. The LMV324IPT provides rail-to-rail output and significantly higher output current (160mA per channel versus 30mA), making it suitable for low-voltage, high-current applications. Circuit redesign is required if the original design requires supply voltages above 6V.

Q: Why does the TL064IPWR have different electrical characteristics?

A: The TL064IPWR uses J-FET input technology rather than bipolar input architecture. This results in dramatically lower input bias current (30pA versus 20nA) and higher slew rate (3.5V/µs versus 0.3V/µs). However, J-FET inputs require minimum 10V supply voltage, making this substitute incompatible with designs operating below 10V. This part is appropriate only for applications where J-FET input characteristics provide design advantages.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, matching the original LM324PT specifications. All parts are REACH unaffected and carry EAR99 ECCN classification.

Q: What is the significance of "Last Time Buy" status for the LM2902KAVQPWRG4Q1?

A: Last Time Buy status indicates the manufacturer has announced planned discontinuation. While currently available, this part will eventually reach end-of-life. Designs requiring long-term production continuity should prioritize substitutes with Active product status, such as LM224PT, LM224APT, or LM2902KAVQPWR.

Q: Can I use the MC3303PT in applications requiring 32V supply voltage?

A: Yes. The MC3303PT supports supply voltage range from 3V to 36V maximum, exceeding the original LM324PT specification of 32V maximum. This part is suitable for high-voltage applications and provides 1MHz gain bandwidth product with 0.5V/µs slew rate.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in 14-TSSOP surface mount package with identical 0.173" width and 4.40mm width specification. Packaging formats vary by manufacturer and part number (Cut Tape, Tape & Reel, or Digi-Reel), but the physical package dimensions remain consistent across all substitutes.

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