LP324D Equivalent & Substitute Parts

Part Overview

The LP324D is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LP324D operates across a wide supply voltage range (3V to 32V) and is suitable for low-speed analog signal processing applications requiring minimal power consumption. Due to its Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term component sourcing.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.05	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	2	nA
Voltage - Input Offset	2	mV
Current - Supply (x4 Channels)	85	µA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LP324D is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory)
Supply voltage range: 3V to 32V minimum (mandatory)
Operating temperature: 0°C to 70°C or wider range (mandatory)
RoHS3 compliance (mandatory)
Moisture Sensitivity Level: 1 (preferred)

Secondary Compatibility Parameters:

Slew rate: 0.05 V/µs or higher
Gain bandwidth product: 100 kHz or higher
Input bias current: 2 nA or lower
Input offset voltage: 2 mV or lower
Supply current: 85 µA or lower per channel group
Output current per channel: 10 mA or higher

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with identical electrical performance) and Functional Alternatives (meeting primary criteria with enhanced or different electrical characteristics suitable for the same application space).

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Temp Range (°C)	Package
LP324D	Texas Instruments	Last Time Buy	0.05	100	2	2	85	10	0 to 70	14-SOIC
LP324DR	Texas Instruments	Active	0.05	100	2	2	85	10	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	100	2	2	85	10	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	100	2	2	85	10	0 to 70	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1000	45	2	1500	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1000	45	2	1500	40	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1000	45	2	1500	40	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1000	45	2	1500	40	0 to 70	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1200	20	1	1000	30	-40 to 125	14-SOIC
AS324MTR-E1	Diodes Incorporated	Active	—	—	20	2	1000	40	-40 to 85	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	500	20	2	600	35	-40 to 85	14-SOIC

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended Primary Substitutes):

LP324DR, LP324M/NOPB, and LP324MX/NOPB are direct functional equivalents to the LP324D. All three parts are manufactured by Texas Instruments, maintain identical electrical specifications (0.05 V/µs slew rate, 100 kHz gain bandwidth product, 2 nA input bias current, 85 µA supply current), and are housed in 14-SOIC packaging. These parts carry Active product status, ensuring long-term availability and supply chain stability. All are ROHS3 compliant with MSL 1 rating. LP324DR is available in Cut Tape and Digi-Reel packaging with 18,309 units in stock. LP324M/NOPB is supplied in Tube packaging with 2,000 units available. LP324MX/NOPB is supplied in Tape & Reel format with 23,900 units in stock. Selection among these three should be based on packaging and quantity requirements.

Tier 2 - Functional Alternatives (Secondary Substitutes):

LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB are Texas Instruments parts belonging to the LinCMOS™ series. These devices maintain the 4-circuit configuration and 14-SOIC package format with identical supply voltage range (3V to 32V) and operating temperature (0°C to 70°C). However, they exhibit enhanced electrical performance: 1 MHz gain bandwidth product (10× higher than LP324D), 45 nA input bias current (higher than LP324D), and 1.5 mA supply current (higher than LP324D). These parts are suitable for applications requiring higher bandwidth and output current capability. All carry Active product status and ROHS3 compliance.

Tier 3 - Extended Temperature Range Alternatives:

AS324MTR-E1 (Diodes Incorporated) and BA10324AF-E2 (Rohm Semiconductor) offer extended operating temperature ranges (-40°C to 85°C and -40°C to 85°C respectively) compared to the LP324D (0°C to 70°C). Both maintain 4-circuit configuration and 14-SOIC packaging. AS324MTR-E1 provides 1 mA supply current and 40 mA output current per channel. BA10324AF-E2 offers 0.2 V/µs slew rate and 500 kHz gain bandwidth product. These alternatives are suitable for applications requiring wider temperature operation. Both are ROHS3 compliant and carry Active product status.

Not Recommended:

LM2902DR (Rohm Semiconductor) carries Obsolete product status and should not be selected for new designs despite meeting packaging and electrical criteria.

Frequently Asked Questions (FAQ)

Q1: Can LP324DR be used as a direct replacement for LP324D?

Yes. LP324DR is a direct equivalent manufactured by Texas Instruments with identical electrical specifications, package type (14-SOIC), and operating temperature range (0°C to 70°C). The primary difference is packaging format: LP324DR is supplied in Cut Tape and Digi-Reel format, while LP324D is supplied in Tube. Both are ROHS3 compliant with MSL 1 rating.

Q2: What is the difference between LP324 and LM324 series parts?

The LP324 series (LP324D, LP324DR, LP324M/NOPB, LP324MX/NOPB) maintains lower power consumption specifications: 0.05 V/µs slew rate, 100 kHz gain bandwidth product, and 85 µA supply current. The LM324 series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) offers enhanced performance: 1 MHz gain bandwidth product and higher output current capability (40 mA per channel versus 10 mA). Selection depends on application bandwidth and power consumption requirements.

Q3: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts listed in this document carry ROHS3 compliance certification. Moisture Sensitivity Level varies: LP324 series parts maintain MSL 1 (Unlimited), while AS324MTR-E1 carries MSL 3 (168 Hours). This affects storage and handling requirements.

Q4: Can I use LM2902DR as a substitute?

LM2902DR is not recommended for new designs. Although it meets packaging and electrical criteria, it carries Obsolete product status, indicating discontinued production and uncertain long-term availability.

Q5: Which substitute part offers the widest operating temperature range?

AS324MTR-E1 and BA10324AF-E2 both operate across -40°C to 85°C, compared to LP324D's 0°C to 70°C range. Selection between these two depends on specific bandwidth and power consumption requirements for your application.

Q6: What packaging options are available for LP324 equivalents?

LP324 series equivalents are available in three packaging formats: Tube (LP324M/NOPB), Cut Tape & Digi-Reel (LP324DR), and Tape & Reel (LP324MX/NOPB). Selection should align with your assembly process and quantity requirements.

Q7: How do I determine if a substitute part is suitable for my circuit?

Verify that the substitute part meets these mandatory criteria: 4-circuit configuration, 14-SOIC package, 3V to 32V supply voltage range, and operating temperature range that encompasses your application requirements. For applications sensitive to power consumption, select LP324 series parts. For applications requiring higher bandwidth or output current, select LM324 series parts.

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