LM348N Equivalent & Substitute Parts

Part Overview

The LM348N is a general-purpose operational amplifier manufactured by STMicroelectronics, configured as a 4-circuit integrated circuit in a 14-DIP package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. The LM348N operates across a 0°C to 70°C temperature range with a 1 MHz gain-bandwidth product and 0.5 V/µs slew rate, making it suitable for general-purpose amplification applications requiring moderate performance characteristics.

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	2.1	mA (x4 Channels)
Current - Output / Channel	25	mA
Voltage - Supply Span (Min)	44	V
Voltage - Supply Span (Max)	44	V
Operating Temperature	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM348N is determined by strict alignment of electrical and mechanical parameters within the 14-DIP through-hole package category. The primary substitution criteria are:

Electrical Compatibility Parameters:

Number of circuits: 4 (mandatory)
Package type: 14-DIP (0.300", 7.62mm) (mandatory)
Mounting type: Through Hole (mandatory)
Operating temperature range: 0°C to 70°C (mandatory)
Gain-bandwidth product: 1 MHz (primary criterion)
Slew rate: 0.5 V/µs or greater
Supply voltage span: 44 V minimum
Input bias current: 30 nA or lower
Input offset voltage: 1 mV or lower

Compliance Parameters:

RoHS3 Compliant (mandatory)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory)
REACH Unaffected status (mandatory)

Substitute parts are grouped into two categories: General Purpose amplifiers (matching the LM348N amplifier type) and J-FET amplifiers (offering superior input bias current characteristics). General Purpose substitutes maintain functional equivalence for standard applications. J-FET substitutes provide enhanced performance in low-bias-current applications while maintaining package and pin compatibility.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Temp Range (°C)	Status
LM348N	STMicroelectronics	General Purpose	0.5	1	30	1	2.1	25	44	0 to 70	Obsolete
LM224N	STMicroelectronics	General Purpose	0.4	1.3	20	2	1.5	40	3 to 30	-40 to 105	Obsolete
LM324N/NOPB	Texas Instruments	General Purpose	—	1	45	2	1.5	40	3 to 32	0 to 70	Active
LF444ACN/NOPB	Texas Instruments	J-FET	1	1	0.01	2	0.6	14	44	0 to 70	Active
LT1058ACN#PBF	Analog Devices Inc.	J-FET	14	5	0.005	0.18	1.6	—	20 to 36	0 to 70	Active
LT1058CN#PBF	Analog Devices Inc.	J-FET	13	5	0.007	0.25	1.7	—	20 to 36	0 to 70	Active
LT1114ACN#PBF	Analog Devices Inc.	General Purpose	0.3	0.75	0.07	0.02	0.35	—	2 to 40	0 to 70	Active
LT1114CN#PBF	Analog Devices Inc.	General Purpose	0.3	0.75	0.07	0.02	0.35	—	2 to 40	0 to 70	Active
LT1114IN	Analog Devices Inc.	General Purpose	0.3	0.75	0.07	0.02	0.35	—	2 to 40	-40 to 85	Active
LT1114IN#PBF	Analog Devices Inc.	General Purpose	0.3	0.75	0.07	0.02	0.35	—	2 to 40	-40 to 85	Active

Engineering Selection Recommendations

General Purpose Amplifier Substitutes (Recommended for Direct Replacement):

The LM324N/NOPB (Texas Instruments) is the primary recommended substitute for the LM348N. This device maintains identical 4-circuit configuration, 14-DIP package geometry, and 1 MHz gain-bandwidth product. The LM324N/NOPB is in active production status, ensuring long-term availability and supply chain continuity. Both devices are ROHS3 compliant with MSL 1 rating and REACH unaffected status. The LM324N/NOPB operates within the 0°C to 70°C temperature range matching the LM348N specification. This substitute is suitable for applications where the LM348N's specific input bias current (30 nA) and input offset voltage (1 mV) characteristics are not critical design constraints.

The LM224N (STMicroelectronics) provides an alternative general-purpose substitute with enhanced output current capability (40 mA versus 25 mA) and improved gain-bandwidth product (1.3 MHz). However, this device is also classified as obsolete, limiting its utility for long-term production requirements.

J-FET Amplifier Substitutes (Performance Enhancement):

The LF444ACN/NOPB (Texas Instruments) and LT1058 series devices (Analog Devices Inc.) offer J-FET input architecture, delivering substantially lower input bias current (10 pA to 5 pA range) compared to the LM348N (30 nA). These devices maintain 4-circuit configuration and 14-DIP package compatibility. The LF444ACN/NOPB is in active production and provides 1 MHz gain-bandwidth product matching the LM348N. The LT1058 series offers enhanced performance with 5 MHz gain-bandwidth product and superior slew rate (13–14 V/µs), suitable for applications requiring higher bandwidth and faster transient response.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring regulatory alignment with the original LM348N specification. Active production status of the LM324N/NOPB, LF444ACN/NOPB, and LT1058 series ensures component availability for current and future production cycles.

Frequently Asked Questions (FAQ)

Q: Can the LM324N/NOPB directly replace the LM348N in existing designs?

A: The LM324N/NOPB is mechanically and functionally compatible with the LM348N. Both devices feature 4 operational amplifiers in a 14-DIP through-hole package with 1 MHz gain-bandwidth product and 0°C to 70°C operating temperature range. Pin configuration and package dimensions are identical. The primary electrical difference is input bias current (45 nA for LM324N/NOPB versus 30 nA for LM348N). Direct substitution is appropriate for applications where this parameter variance does not affect circuit performance.

Q: What is the advantage of J-FET input amplifiers over general-purpose substitutes?

A: J-FET input amplifiers (LF444ACN/NOPB, LT1058 series) provide input bias current in the picoampere range (5–10 pA) compared to nanoampere range (30–45 nA) for general-purpose devices. This characteristic is critical in high-impedance signal conditioning, precision instrumentation, and applications sensitive to input bias current effects. J-FET devices maintain identical 14-DIP package and 4-circuit configuration, enabling direct pin-compatible substitution where enhanced input characteristics are required.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed in this reference maintain ROHS3 compliance status, matching the LM348N specification. Moisture sensitivity level is uniformly rated as MSL 1 (Unlimited) across all devices, and REACH unaffected status is maintained. These compliance characteristics ensure regulatory alignment for applications subject to environmental and hazardous substance restrictions.

Q: What is the significance of active versus obsolete product status?

A: Active production status indicates ongoing manufacturer support, established supply chains, and long-term component availability. Obsolete status indicates discontinued production, limited inventory, and potential supply discontinuity. The LM348N is classified as obsolete; therefore, substitution with active-status devices (LM324N/NOPB, LF444ACN/NOPB, LT1058 series) is recommended for new designs and production continuity.

Q: Can the LT1114 series substitute for the LM348N?

A: The LT1114 series (Analog Devices Inc.) maintains 4-circuit configuration and 14-DIP package compatibility with the LM348N. However, the LT1114 series exhibits reduced gain-bandwidth product (750 kHz versus 1 MHz) and lower slew rate (0.3 V/µs versus 0.5 V/µs). Substitution is appropriate only for applications where the LM348N's bandwidth and slew rate specifications exceed design requirements. The LT1114 series offers superior supply voltage range (2–40 V) and lower supply current (350 µA), making it suitable for low-power applications.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts maintain through-hole mounting in 14-DIP (0.300", 7.62mm) package format, ensuring mechanical compatibility with existing printed circuit board layouts and socket configurations. Supplier device package designations vary (14-DIP versus 14-PDIP), but physical dimensions and pin spacing are identical. No PCB redesign or rework is required for mechanical integration.

Q: How do supply voltage specifications affect substitution decisions?

A: The LM348N operates at a fixed 44 V supply span, a characteristic unique to this device. The LM324N/NOPB supports 3–32 V supply range, the LF444ACN/NOPB supports 44 V (matching LM348N), and the LT1058 series supports 20–36 V. For applications requiring the full 44 V supply span, the LF444ACN/NOPB is the appropriate substitute. For applications operating within lower voltage ranges, the LM324N/NOPB and LT1114 series provide flexibility with extended supply voltage specifications.

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