LP324DRG4 Equivalent & Substitute Parts

Part Overview

The LP324DRG4 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 obsolete, indicating discontinued production status. The LP324DRG4 operates across a supply voltage range of 3V to 32V with a slew rate of 0.05V/µs and gain bandwidth product of 100 kHz, designed for low-speed analog signal processing applications requiring minimal power consumption.

Due to its obsolete product status, sourcing new original inventory of the LP324DRG4 becomes increasingly difficult. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	LP324DRG4 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 LP324DRG4 is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory)
Supply voltage range: 3V to 32V minimum (mandatory)
Amplifier type: General Purpose (mandatory)
RoHS3 compliance and MSL rating compatibility

Secondary Compatibility Parameters:

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

Substitute parts are grouped into two categories based on electrical performance alignment with the LP324DRG4:

Category A - Direct Electrical Equivalents (LP324 Series): Parts maintaining identical or superior electrical specifications to the LP324DRG4, including slew rate of 0.05V/µs and 100 kHz bandwidth.

Category B - Functional Equivalents (LM324 Series & Alternatives): Parts with enhanced electrical performance (higher slew rate, higher bandwidth, higher output current) that maintain backward compatibility through superior specifications while operating within the same supply voltage and package constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Supply Current (µA)	Output Current (mA)	Temp Range (°C)	Package
LP324DRG4	Texas Instruments	Obsolete	0.05	100	2	85	10	0 to 70	14-SOIC
LP324DR	Texas Instruments	Active	0.05	100	2	85	10	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	100	2	85	10	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	100	2	85	10	0 to 70	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1000	45	1500	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1000	45	1500	40	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1000	45	1500	40	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1000	45	1500	40	0 to 70	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1200	20	1000	30	-40 to 125	14-SOIC
AS324AMTR-G1	Diodes Incorporated	Active	—	—	20	1000	40	-40 to 85	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	500	20	600	35	-40 to 85	14-SOIC

Engineering Selection Recommendations

Recommended Primary Substitutes (Direct Equivalents):

The LP324DR, LP324M/NOPB, and LP324MX/NOPB represent the most direct substitutes for the LP324DRG4. These parts maintain identical electrical specifications including 0.05V/µs slew rate, 100 kHz gain bandwidth product, 2 nA input bias current, and 85µA supply current. All three are manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. The primary distinction among these three is packaging format: LP324DR is supplied in Cut Tape and Digi-Reel format, while LP324M/NOPB and LP324MX/NOPB are supplied in Tube and Tape & Reel formats respectively. Selection between these three should be based on procurement and assembly requirements rather than electrical performance.

Secondary Substitutes (Enhanced Performance):

The LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB are Texas Instruments LinCMOS™ series devices offering enhanced electrical performance. These parts provide 1 MHz gain bandwidth product (10× improvement), 40 mA output current per channel (4× improvement), and 1.5 mA supply current. While input bias current increases to 45 nA, these devices remain within acceptable ranges for most general-purpose applications. All four maintain the 3V to 32V supply voltage range and 14-SOIC package compatibility. These substitutes are suitable for applications requiring higher bandwidth or output drive capability while maintaining backward compatibility through superior specifications.

Alternative Manufacturer Options:

The AS324AMTR-G1 (Diodes Incorporated) and BA10324AF-E2 (Rohm Semiconductor) provide cross-manufacturer alternatives. The AS324AMTR-G1 offers active product status with extended temperature range (-40°C to 85°C) and 40 mA output current. The BA10324AF-E2 provides 0.2V/µs slew rate and 500 kHz bandwidth with active status and extended temperature operation. Both maintain 14-SOIC package compatibility and 3V to 32V supply voltage range. These options are appropriate when supply diversification or extended temperature operation is required.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL rating of 1 (unlimited) or MSL 3 (168 hours), ensuring compatibility with standard manufacturing processes. The LP324 series maintains identical MSL 1 rating to the original part. All substitutes carry EAR99 ECCN classification and REACH unaffected status, matching the regulatory profile of the LP324DRG4.

Frequently Asked Questions (FAQ)

Q: Can the LM324 series directly replace the LP324DRG4 in existing designs?

A: Yes, the LM324 series provides backward compatibility through superior electrical specifications. The LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB all maintain the 3V to 32V supply voltage range, 14-SOIC package, and 4-circuit configuration. Enhanced performance parameters (higher bandwidth, higher output current, lower supply current) ensure operation within or exceeding original design margins. No circuit modifications are required.

Q: What is the primary difference between LP324DR and LP324M/NOPB?

A: Both parts are electrically identical with matching specifications. The distinction is packaging format: LP324DR is supplied in Cut Tape and Digi-Reel format suitable for automated assembly, while LP324M/NOPB is supplied in Tube format suitable for manual handling and smaller quantity orders. Selection depends on procurement volume and assembly process requirements.

Q: Why does the LM2902DR show as obsolete despite being listed as a substitute?

A: The LM2902DR is included for reference purposes for designs currently utilizing this part. While LM2902DR is obsolete, it demonstrates functional equivalence to the LP324DRG4 through 4-circuit configuration and 14-SOIC packaging. However, for new designs or obsolescence mitigation, the active-status alternatives (LM324 series, AS324AMTR-G1, BA10324AF-E2) are recommended.

Q: Are there package compatibility concerns between 14-SOIC variants?

A: The LP324DRG4 uses 14-SOIC with 0.154" (3.90mm) width. All recommended substitutes maintain this standard 14-SOIC footprint. The BA10324AF-E2 uses 14-SOP with 0.173" (4.40mm) width, which is mechanically compatible with 14-SOIC PCB layouts due to identical pin pitch and spacing, though the package body is slightly wider. Verify PCB silkscreen clearance if space constraints exist.

Q: What supply current differences should be considered when substituting?

A: The LP324DRG4 draws 85µA total supply current (21.25µA per channel). The LM324 series draws 1.5mA total (375µA per channel), representing approximately 18× higher consumption. For battery-powered or ultra-low-power applications, the LP324 series direct equivalents (LP324DR, LP324M/NOPB, LP324MX/NOPB) maintain the original 85µA specification. The LM324 series is appropriate for applications where power consumption is not a primary constraint.

Q: Can the extended temperature range variants be used in 0°C to 70°C applications?

A: Yes. The AS324AMTR-G1 and BA10324AF-E2 specify -40°C to 85°C operating range, which encompasses the LP324DRG4 range of 0°C to 70°C. Extended temperature capability provides additional design margin and is suitable for all applications within the original temperature specification.

Q: What is the significance of MSL rating differences?

A: The LP324DRG4 and most substitutes carry MSL 1 (unlimited moisture sensitivity), meaning no moisture bake-out is required before soldering. The AS324AMTR-G1 carries MSL 3 (168 hours), requiring moisture bake-out at 125°C for 24 hours if the part has been exposed to ambient humidity for more than 168 hours. For standard manufacturing environments with controlled storage, this difference is typically not significant.

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