LM348N Equivalent & Substitute Parts

Part Overview

The LM348N is a general-purpose operational amplifier featuring four independent circuits in a 14-pin DIP package. Manufactured by onsemi, this device is classified as obsolete and operates across a supply voltage span of 36 V with a slew rate of 0.5 V/µs and gain bandwidth product of 1 MHz. The obsolete status of the LM348N necessitates identification of equivalent and substitute components for ongoing design support and production continuity. Substitute parts are selected based on matching amplifier type, circuit count, package configuration, and critical electrical parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	30	nA
Voltage - Input Offset	1	mV
Current - Supply	2.4	mA
Current - Output / Channel	25	mA
Voltage - Supply Span	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitute parts for the LM348N are categorized into two groups based on electrical and mechanical compatibility:

Direct Substitutes (Equivalent Functionality): Parts that maintain identical or near-identical electrical specifications, package configuration, and circuit count. These substitutes operate within the same parameter ranges for slew rate, gain bandwidth product, input bias current, and output current per channel.

Upgrade Substitutes (Enhanced Performance): Parts that provide improved electrical characteristics while maintaining package compatibility and circuit count. These substitutes offer extended operating temperature ranges, higher gain bandwidth products, or improved supply voltage specifications.

Similar Alternatives (Functional Equivalents): Parts that share the same amplifier type and circuit count but may have different electrical characteristics, supply voltage ranges, or compliance certifications. These alternatives require design verification for specific application parameters.

The critical parameters determining substitution eligibility are:

Amplifier Type: General Purpose
Number of Circuits: 4
Package / Case: 14-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Current - Output / Channel: 25 mA or greater
Voltage - Supply Span: Minimum 36 V or greater

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Input Bias Current (nA)	Input Offset Voltage (mV)	Supply Current (mA)	Output Current / Channel (mA)	Supply Voltage Span (V)	Operating Temperature (°C)	Package	Product Status
LM348N	onsemi	General Purpose	4	0.5	1	30	1	2.4	25	36	0 to 70	14-DIP	Obsolete
LM348N	STMicroelectronics	General Purpose	4	0.5	1	30	1	2.1	25	44	0 to 70	14-DIP	Obsolete
LM248N	STMicroelectronics	General Purpose	4	0.5	1.3	30	1	2.1	25	44	-40 to 105	14-DIP	Obsolete
LM324AN/NOPB	Texas Instruments	General Purpose	4	—	1	45	2	1.5	40	3 to 32	0 to 70	14-DIP	Active
LM324N	Intersil	General Purpose	4	—	—	45	2	1.5	40	3 to 32	0 to 70	14-DIP	Obsolete
LM324NE3	Texas Instruments	General Purpose	4	—	1.2	45	2	1.5	40	3 to 32	0 to 70	14-DIP	Last Time Buy

Engineering Selection Recommendations

Direct Substitution (Preferred): The LM348N manufactured by STMicroelectronics serves as the primary direct substitute. This part maintains identical electrical specifications for slew rate, gain bandwidth product, input bias current, and input offset voltage. The STMicroelectronics variant offers improved supply voltage span (44 V versus 36 V) and carries ROHS3 compliance, providing enhanced regulatory alignment compared to the onsemi original.

Upgrade Path: The LM248N from STMicroelectronics functions as an upgrade substitute, offering an extended operating temperature range (-40°C to 105°C versus 0°C to 70°C) and improved gain bandwidth product (1.3 MHz versus 1 MHz). This part maintains package compatibility and circuit count while providing superior performance characteristics. ROHS3 compliance is included.

Alternative Selection: The LM324AN/NOPB from Texas Instruments and LM324NE3 from Texas Instruments represent functional alternatives with active or last-time-buy product status. These parts maintain the four-circuit configuration and 14-DIP package but operate across a reduced supply voltage span (3 V to 32 V). The LM324AN/NOPB carries active product status, ensuring long-term availability. The LM324NE3 provides a higher gain bandwidth product (1.2 MHz) but is designated as last-time-buy.

Compliance Considerations: The STMicroelectronics LM348N and LM248N both carry ROHS3 compliance, whereas the onsemi original is RoHS non-compliant. The Texas Instruments LM324AN/NOPB and LM324NE3 are ROHS3 compliant. All parts maintain REACH unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the LM348N from STMicroelectronics directly replace the onsemi LM348N?

A: Yes. Both parts share identical electrical specifications for slew rate (0.5 V/µs), gain bandwidth product (1 MHz), input bias current (30 nA), and input offset voltage (1 mV). Package configuration and circuit count are identical. The STMicroelectronics variant provides a higher supply voltage span (44 V versus 36 V) and ROHS3 compliance.

Q: What is the primary advantage of the LM248N upgrade substitute?

A: The LM248N extends the operating temperature range to -40°C to 105°C, compared to 0°C to 70°C for the LM348N. Additionally, the gain bandwidth product increases to 1.3 MHz. Both parts maintain the same package, circuit count, and core electrical characteristics.

Q: Are the LM324 variants suitable replacements for the LM348N?

A: The LM324 variants (LM324AN/NOPB, LM324N, LM324NE3) maintain the four-circuit configuration and 14-DIP package but operate across a reduced supply voltage span (3 V to 32 V versus 36 V). These parts are functionally equivalent for applications not requiring the full 36 V supply span. The LM324AN/NOPB carries active product status, ensuring availability.

Q: What is the difference between the LM324AN/NOPB and LM324NE3?

A: Both parts are manufactured by Texas Instruments and share identical electrical specifications. The LM324AN/NOPB carries active product status, while the LM324NE3 is designated as last-time-buy. The LM324NE3 provides a higher gain bandwidth product (1.2 MHz versus 1 MHz for the LM324AN/NOPB).

Q: Does the LM324N from Intersil provide equivalent functionality?

A: The Intersil LM324N maintains the four-circuit configuration and 14-DIP package with identical electrical specifications to other LM324 variants. However, this part is classified as obsolete and carries RoHS non-compliant status, making it less suitable for new designs compared to active or ROHS3-compliant alternatives.

Q: What supply voltage considerations apply when selecting a substitute?

A: The onsemi LM348N operates across a 36 V supply span. The STMicroelectronics LM348N and LM248N support 44 V. The LM324 variants operate across 3 V to 32 V. Applications requiring the full 36 V or higher supply span must use the LM348N variants or LM248N. Applications operating below 32 V can utilize LM324 alternatives.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All substitute parts listed are available in 14-DIP (0.300", 7.62mm) through-hole packages, ensuring mechanical compatibility with existing PCB designs.

Q: What compliance certifications should be considered for new designs?

A: The STMicroelectronics LM348N, LM248N, and Texas Instruments LM324AN/NOPB and LM324NE3 all carry ROHS3 compliance. All parts maintain REACH unaffected status and EAR99 export classification. The onsemi LM348N and Intersil LM324N are RoHS non-compliant and should not be selected for new designs subject to RoHS requirements.

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