LP324DRE4 Equivalent & Substitute Parts

Part Overview

The LP324DRE4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface mount packaging. This component is classified as discontinued at DiGi Electronics, indicating limited availability through standard distribution channels. The LP324DRE4 operates across a supply voltage range of 3V to 32V with an operating temperature range of 0°C to 70°C, making it suitable for low-speed analog signal processing applications. Identification of equivalent and substitute parts is necessary due to product discontinuation status and potential inventory constraints. Substitute components must maintain electrical compatibility across critical parameters including supply voltage span, circuit count, package form factor, and output current specifications.

Key Parameters

Parameter	LP324DRE4 Value	Unit
Manufacturer	Texas Instruments	—
Category	Linear, Amplifiers	—
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
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
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Product Status	Discontinued at DiGi Electronics	—

Substitute Part Grouping Explanation

Substitution of the LP324DRE4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of Circuits: Must equal 4
Package / Case: Must be 14-SOIC with 0.154" (3.90mm) width
Mounting Type: Must be Surface Mount
Voltage - Supply Span (Min): Must be ≤ 3V
Voltage - Supply Span (Max): Must be ≥ 32V
Current - Output / Channel: Must be ≥ 10 mA
RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be 1 (Unlimited)

Secondary Compatibility Parameters:

Amplifier Type: General Purpose
Current - Input Bias: ≤ 2 nA (preferred for low-bias applications)
Voltage - Input Offset: ≤ 2 mV
Operating Temperature Range: Must encompass or exceed 0°C to 70°C

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Functional Substitutes (compatible within allowed parameter ranges but with different performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Product Status	Number of Circuits	Package / Case	Slew Rate (V/µs)	Gain Bandwidth Product (kHz)	Current - Input Bias (nA)	Voltage - Input Offset (mV)	Current - Supply (µA)	Current - Output / Channel (mA)	Voltage - Supply Span Min (V)	Voltage - Supply Span Max (V)	Operating Temperature (°C)
LP324DRE4	Texas Instruments	Discontinued	4	14-SOIC (3.90mm)	0.05	100	2	2	85	10	3	32	0 to 70
LP324DR	Texas Instruments	Active	4	14-SOIC (3.90mm)	0.05	100	2	2	85	10	3	32	0 to 70
LP324M/NOPB	Texas Instruments	Active	4	14-SOIC (3.90mm)	0.05	100	2	2	85	10	3	32	0 to 70
LP324MX/NOPB	Texas Instruments	Active	4	14-SOIC (3.90mm)	0.05	100	2	2	85	10	3	32	0 to 70
LM324AM/NOPB	Texas Instruments	Active	4	14-SOIC (3.90mm)	—	1000	45	2	1500	40	3	32	0 to 70
LM324AMX/NOPB	Texas Instruments	Active	4	14-SOIC (3.90mm)	—	1000	45	2	1500	40	3	32	0 to 70
LM324M/NOPB	Texas Instruments	Active	4	14-SOIC (3.90mm)	—	1000	45	2	1500	40	3	32	0 to 70
LM2902DR	Rohm Semiconductor	Obsolete	4	14-SOIC (3.90mm)	0.3	1200	20	1	1000	30	3	32	-40 to 125
BA10324AF-E2	Rohm Semiconductor	Active	4	14-SOIC (4.40mm)	0.2	500	20	2	600	35	3	32	-40 to 85
BA2902F-E2	Rohm Semiconductor	Active	4	14-SOIC (4.40mm)	0.2	500	20	2	700	30	3	32	-40 to 125
LM224DR2G	onsemi	Active	4	14-SOIC (3.90mm)	—	1000	90	2	—	40	3	32	-25 to 85

Engineering Selection Recommendations

Direct Equivalent Substitutes (Identical Electrical and Mechanical Specifications):

The following parts are direct equivalents to the LP324DRE4 and require no circuit redesign or validation:

LP324DR (Texas Instruments, Active): Identical specifications with improved availability (18,309 pcs in stock). Recommended as primary substitute due to active product status and equivalent performance characteristics.
LP324M/NOPB (Texas Instruments, Active): Tube packaging variant with identical electrical specifications (2,000 pcs in stock).
LP324MX/NOPB (Texas Instruments, Active): Tape & Reel packaging variant with identical electrical specifications (23,900 pcs in stock). Recommended for high-volume production applications.

Functional Substitute (Enhanced Performance Characteristics):

LM324AM/NOPB and LM324AMX/NOPB (Texas Instruments, Active): These parts operate within the same supply voltage range (3V to 32V) and package form factor (14-SOIC, 3.90mm). They feature higher gain bandwidth product (1 MHz vs. 100 kHz), increased output current capability (40 mA vs. 10 mA), and higher input bias current (45 nA vs. 2 nA). These characteristics make them suitable for applications requiring faster response or higher output drive capability. Operating temperature range remains 0°C to 70°C. Inventory availability is substantial (105,684 pcs for LM324AM/NOPB; 36,756 pcs for LM324AMX/NOPB).

Alternative Substitutes (Different Package Dimensions):

BA10324AF-E2 and BA2902F-E2 (Rohm Semiconductor, Active): These parts maintain 4-circuit configuration and 14-SOIC package family but with increased package width (4.40mm vs. 3.90mm). Both support the full 3V to 32V supply range. BA10324AF-E2 operates to 85°C; BA2902F-E2 extends to 125°C. Package dimension difference may require PCB layout verification before implementation.

Not Recommended:

LM2902DR (Rohm Semiconductor, Obsolete): Although electrically compatible, obsolete status presents long-term supply risk equivalent to the original part.
LM224DR2G (onsemi, Active): Input bias current (90 nA) significantly exceeds LP324DRE4 specification (2 nA), making it unsuitable for low-bias-current applications.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q1: Can LP324DR be used as a direct replacement for LP324DRE4 without circuit modification?

A: Yes. LP324DR is electrically and mechanically identical to LP324DRE4. Both devices feature identical slew rate (0.05 V/µs), gain bandwidth product (100 kHz), input bias current (2 nA), input offset voltage (2 mV), supply current (85 µA), output current (10 mA), and operating temperature range (0°C to 70°C). The 14-SOIC package dimensions are identical (0.154", 3.90mm width). No circuit redesign is required.

Q2: What is the difference between LP324M/NOPB and LP324MX/NOPB?

A: Both parts are electrically identical to LP324DRE4. The difference is packaging format: LP324M/NOPB is supplied in Tube packaging, while LP324MX/NOPB is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements. Tape & Reel format is typically preferred for automated pick-and-place assembly operations.

Q3: Why is LM324AM/NOPB listed as a functional substitute rather than a direct equivalent?

A: LM324AM/NOPB differs from LP324DRE4 in three key parameters: gain bandwidth product (1 MHz vs. 100 kHz), input bias current (45 nA vs. 2 nA), and output current per channel (40 mA vs. 10 mA). These differences indicate enhanced performance characteristics suitable for higher-speed applications or circuits requiring greater output drive capability. Applications designed specifically for the low-speed, low-bias characteristics of LP324DRE4 should use direct equivalents (LP324DR, LP324M/NOPB, or LP324MX/NOPB) instead.

Q4: Can BA10324AF-E2 or BA2902F-E2 be used as substitutes?

A: These Rohm Semiconductor parts are electrically compatible within the 3V to 32V supply range and maintain 4-circuit configuration in 14-SOIC package family. However, package width differs (4.40mm vs. 3.90mm). This dimension change may affect PCB layout compatibility, particularly in space-constrained designs. Verify PCB footprint clearances and adjacent component spacing before implementation. BA10324AF-E2 operates to 85°C; BA2902F-E2 extends to 125°C, offering extended temperature capability if required.

Q5: Is LM224DR2G suitable as a substitute?

A: LM224DR2G is not recommended as a substitute for LP324DRE4. Although both are 4-circuit general-purpose amplifiers in 14-SOIC packaging with identical supply voltage range (3V to 32V), the input bias current specification differs significantly: LM224DR2G specifies 90 nA versus LP324DRE4's 2 nA. This 45-fold increase in input bias current makes LM224DR2G unsuitable for applications designed around the low-bias characteristics of LP324DRE4, particularly in high-impedance signal conditioning circuits.

Q6: What is the inventory status of recommended substitutes?

A: LP324DR (primary recommendation) has 18,309 pcs in stock. LP324MX/NOPB has 23,900 pcs available. LM324AM/NOPB has 105,684 pcs in stock, and LM324AMX/NOPB has 36,756 pcs available. All recommended substitutes maintain active product status, ensuring long-term availability and supply chain stability.

Q7: Are all recommended substitutes RoHS3 compliant?

A: Yes. All recommended substitute parts (LP324DR, LP324M/NOPB, LP324MX/NOPB, LM324AM/NOPB, LM324AMX/NOPB, BA10324AF-E2, and BA2902F-E2) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for all parts.

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