LM124DG4 Equivalent & Substitute Parts

Part Overview

The LM124DG4 is a general-purpose operational amplifier featuring four independent differential circuits in a 14-SOIC surface-mount package. Manufactured by Texas Instruments, this device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LM124DG4 operates across an extended temperature range of -55°C to 125°C and supports supply voltages from 3V to 30V, making it suitable for industrial and military-grade applications requiring wide operating conditions.

Identifying equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts future procurement. Alternative models with compatible electrical and mechanical specifications ensure design continuity and long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Differential	—
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	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-55 to 125	°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

Substitute parts for the LM124DG4 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Number of circuits: 4 independent amplifier stages
Package type: 14-SOIC surface-mount configuration with 0.154" (3.90mm) width
Supply voltage range: Minimum 3V, Maximum 30V or higher
Operating temperature range: Must support -55°C to 125°C or equivalent industrial/military grade
Gain bandwidth product: 1.2 MHz nominal
Current output per channel: 30 mA minimum

Substitution Categories:

Category 1: Direct Electrical & Thermal Equivalents Parts maintaining identical or superior electrical performance across the full -55°C to 125°C temperature range with matching 14-SOIC packaging.

Category 2: Functional Equivalents with Relaxed Temperature Range Parts with compatible electrical specifications but narrower operating temperature ranges (0°C to 70°C), suitable for applications not requiring extended low-temperature operation.

Category 3: Performance-Optimized Alternatives Parts with modified electrical characteristics (lower slew rate, reduced bandwidth, lower supply current) but maintaining core four-circuit differential amplifier functionality and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Product Status
LM124DG4	Texas Instruments	0.5	1.2	20	3	1.4	30	-55 to 125	Last Time Buy
LM124D	STMicroelectronics	0.4	1.2	20	2	1.5	30	-55 to 125	Obsolete
LM124DRG4	Texas Instruments	0.5	1.2	20	3	1.4	30	-55 to 125	Discontinued
LM2902DR	Rohm Semiconductor	0.3	1.2	20	1	1.0	30	-40 to 125	Obsolete
LM324AM/NOPB	Texas Instruments	—	1.0	45	2	1.5	40	0 to 70	Active
LM324AMX/NOPB	Texas Instruments	—	1.0	45	2	1.5	40	0 to 70	Active
LM324M/NOPB	Texas Instruments	—	1.0	45	2	1.5	40	0 to 70	Active
LM324MX/NOPB	Texas Instruments	—	1.0	45	2	1.5	40	0 to 70	Active
LP324M/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	0 to 70	Active
LP324MX/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	0 to 70	Active
BA10324AF-E2	Rohm Semiconductor	0.2	0.5	20	2	0.6	35	-40 to 85	Active

Engineering Selection Recommendations

For Extended Temperature Range Applications (-55°C to 125°C):

The LM124DRG4 (Texas Instruments, Cut Tape & Digi-Reel packaging) provides direct electrical and thermal equivalence to the LM124DG4. Both devices maintain identical slew rate (0.5V/µs), gain bandwidth product (1.2 MHz), and supply current specifications across the full industrial temperature range. The LM124DRG4 is classified as Discontinued at DiGi Electronics with 5600 units in stock, offering superior availability compared to the Last Time Buy LM124DG4 (3300 units).

The LM124D (STMicroelectronics) offers comparable performance with marginally improved input offset voltage (2 mV vs. 3 mV) and identical thermal range. However, its Obsolete status limits long-term procurement viability.

For Standard Industrial Temperature Range (0°C to 70°C):

The LM324MX/NOPB and LM324AMX/NOPB (Texas Instruments, Active status) provide four-circuit general-purpose amplification with superior output current capability (40 mA vs. 30 mA). These LinCMOS™ series devices feature higher inventory levels (50513 and 36756 units respectively) and Active product status, ensuring sustained availability. The trade-off is reduced slew rate performance and narrower temperature range.

For Low-Power Applications:

The LP324MX/NOPB (Texas Instruments, Active status) reduces supply current to 85µA with correspondingly lower output current (10 mA) and bandwidth (100 kHz). This device is suitable for battery-powered or power-constrained designs operating within 0°C to 70°C.

For Intermediate Performance Requirements:

The BA10324AF-E2 (Rohm Semiconductor, Active status) balances performance and power consumption with 0.2V/µs slew rate, 500 kHz bandwidth, and 600µA supply current. Operating range extends to -40°C, bridging the gap between standard commercial and extended industrial grades.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and 14-SOIC surface-mount packaging compatible with existing PCB designs.

Frequently Asked Questions (FAQ)

Q1: Can LM324MX/NOPB directly replace LM124DG4 in existing designs?

The LM324MX/NOPB is electrically compatible for applications operating within 0°C to 70°C. Both devices feature four independent differential amplifier circuits in 14-SOIC packaging with 3V to 32V supply range. However, the LM324MX/NOPB operates at reduced slew rate (unspecified) and 1.0 MHz bandwidth versus the LM124DG4's 0.5V/µs and 1.2 MHz. Applications requiring extended temperature operation below 0°C or above 70°C must use LM124DRG4 or LM124D instead.

Q2: What is the difference between LM124DG4 and LM124DRG4?

Both devices are manufactured by Texas Instruments with identical electrical specifications: 0.5V/µs slew rate, 1.2 MHz gain bandwidth product, and -55°C to 125°C operating range. The primary difference is packaging format: LM124DG4 ships in Tube packaging, while LM124DRG4 uses Cut Tape (CT) & Digi-Reel® format. LM124DRG4 offers higher inventory availability (5600 vs. 3300 units) and is suitable for automated assembly processes.

Q3: Why is LP324MX/NOPB not recommended as a primary substitute?

The LP324MX/NOPB operates at significantly reduced performance levels: 0.05V/µs slew rate (100× slower), 100 kHz bandwidth (12× lower), and 10 mA output current (3× lower) compared to LM124DG4. While maintaining four-circuit configuration and 14-SOIC packaging, this device is optimized for low-power applications and is unsuitable for designs requiring the LM124DG4's performance envelope.

Q4: Are all substitute parts RoHS3 compliant?

All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the LM124DG4's environmental certifications. This ensures compatibility with modern manufacturing processes and regulatory requirements.

Q5: Which substitute offers the best long-term availability?

The LM324MX/NOPB (Texas Instruments, Active status, 50513 units in stock) provides the highest inventory level and confirmed Active product status, ensuring sustained procurement for 5+ years. For extended temperature applications, LM124DRG4 (Discontinued at DiGi Electronics, 5600 units) offers superior availability compared to LM124DG4 (Last Time Buy, 3300 units).

Q6: Can BA10324AF-E2 operate at -55°C?

No. The BA10324AF-E2 operates from -40°C to 85°C, limiting its use to applications not requiring sub-zero operation. For designs requiring -55°C minimum temperature, use LM124DRG4, LM124D, or LM2902DR.

Q7: What packaging considerations apply when switching between substitute parts?

All substitute parts use 14-SOIC surface-mount packaging with 0.154" (3.90mm) width, ensuring direct PCB footprint compatibility. However, BA10324AF-E2 uses 14-SOP package with 0.173" (4.40mm) width, requiring footprint verification before substitution. Verify tape & reel versus tube packaging compatibility with assembly equipment.

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