LM348NSR Equivalent & Substitute Parts

Part Overview

The LM348NSR is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this device operates across a supply voltage range of 8V to 36V with a slew rate of 0.5V/µs and 1 MHz gain bandwidth product. The LM348NSR is designated as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for ongoing production and field support.

Key Parameters

Parameter	Value
Amplifier Type	General Purpose
Number of Circuits	4
Slew Rate	0.5V/µs
Gain Bandwidth Product	1 MHz
Current - Input Bias	30 nA
Voltage - Input Offset	1 mV
Current - Supply	2.4mA (x4 Channels)
Current - Output / Channel	25 mA
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM348NSR is determined by the following critical parameters:

Functional Equivalence Criteria:

Four independent operational amplifier circuits
General-purpose amplifier classification
Surface mount 14-SOIC package configuration
ROHS3 compliance for environmental standards

Electrical Compatibility Criteria:

Supply voltage range must encompass or exceed the minimum 8V requirement
Slew rate and gain bandwidth product determine signal fidelity in applications
Input bias current and input offset voltage affect precision circuit performance
Output current capability must support load requirements

Operational Criteria:

Operating temperature range must support the application environment
Product status (Active vs. Obsolete) affects long-term availability
Packaging format (Cut Tape, Tube, Tape & Reel) affects procurement logistics

Substitute parts are grouped based on whether they maintain functional compatibility while offering improved availability or extended operational characteristics.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Output Current (mA)	Inventory
LM348NSR	Texas Instruments	Last Time Buy	0.5	1.0	30	1	8	36	0 ~ 70	25	3200
LM348DR	Texas Instruments	Active	0.5	1.0	30	1	8	36	0 ~ 70	25	23947
LM124DT	STMicroelectronics	Active	0.4	1.3	20	2	3	30	-55 ~ 125	40	10200
LM224D	STMicroelectronics	Active	0.4	1.2	20	2	3	30	-40 ~ 105	40	4495
LM224DT	STMicroelectronics	Active	0.4	1.3	20	2	3	30	-40 ~ 105	40	35200
LM2902D	onsemi	Obsolete	0.5	1.2	20	3	3	26	-40 ~ 125	30	3155
LM2902DR2G	onsemi	Active	—	1.0	90	2	3	32	-40 ~ 105	40	205100
LM2902WDT	Rohm Semiconductor	Obsolete	0.3	1.3	20	1	3	32	-40 ~ 125	40	72800
LM324ADT	STMicroelectronics	Active	0.4	1.3	20	2	3	30	0 ~ 70	40	55200
LM324D	STMicroelectronics	Active	0.4	1.2	20	2	3	30	0 ~ 70	40	5452
LM324DR2G	onsemi	Active	—	1.0	90	2	3	32	0 ~ 70	40	105300

Engineering Selection Recommendations

Primary Substitute: LM348DR

The LM348DR is the direct equivalent manufactured by Texas Instruments. It maintains identical electrical specifications including 0.5V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, and 1 mV input offset voltage. The LM348DR operates across the same 8V to 36V supply range and 0°C to 70°C temperature window. Product status is Active with significantly higher inventory (23,947 units), ensuring long-term availability. Packaging differs only in format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect electrical performance. ROHS3 compliance is maintained.

Secondary Substitutes: LM224DT and LM324ADT

Both LM224DT and LM324ADT are manufactured by STMicroelectronics and maintain Active product status. These devices feature four independent circuits in 14-SOIC packages with ROHS3 compliance. Key differences include:

Reduced minimum supply voltage (3V versus 8V), expanding application range
Slightly lower slew rate (0.4V/µs versus 0.5V/µs)
Enhanced gain bandwidth product (1.3 MHz versus 1.0 MHz)
Improved input bias current (20 nA versus 30 nA)
Extended temperature range (-40°C to 105°C for LM224DT; 0°C to 70°C for LM324ADT)
Higher output current capability (40 mA versus 25 mA)

LM224DT supports extended temperature operation (-40°C to 105°C), while LM324ADT maintains the original 0°C to 70°C range. Both offer superior inventory availability.

Tertiary Substitutes: LM2902DR2G and LM324DR2G

onsemi manufactures both LM2902DR2G and LM324DR2G with Active product status and exceptional inventory levels (205,100 and 105,300 units respectively). These devices support 3V to 32V supply range and feature 40 mA output current per channel. Input bias current is elevated at 90 nA. Slew rate data is not provided. Gain bandwidth product is 1.0 MHz. Both maintain ROHS3 compliance and support 0°C to 70°C operation (LM324DR2G) or -40°C to 105°C operation (LM2902DR2G).

Obsolete Alternatives: LM2902D and LM2902WDT

LM2902D (onsemi) and LM2902WDT (Rohm Semiconductor) are designated Obsolete and should not be selected for new designs despite available inventory. These parts do not support long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM348DR be used as a direct replacement for LM348NSR?

A: Yes. LM348DR is manufactured by the same company (Texas Instruments) and maintains identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect circuit performance. Both are ROHS3 compliant with unlimited moisture sensitivity level.

Q: What are the key differences between LM348NSR and LM224DT?

A: LM224DT offers several advantages: Active product status (versus Last Time Buy), lower minimum supply voltage (3V versus 8V), improved input bias current (20 nA versus 30 nA), higher output current (40 mA versus 25 mA), and extended temperature range (-40°C to 105°C versus 0°C to 70°C). The trade-off is slightly lower slew rate (0.4V/µs versus 0.5V/µs). Both maintain four circuits in 14-SOIC packages.

Q: Is LM324ADT suitable for applications requiring 8V minimum supply voltage?

A: No. LM324ADT has a minimum supply voltage of 3V, not 8V. Applications requiring 8V minimum operation must use LM348DR or verify that the 3V minimum specification does not conflict with circuit design requirements.

Q: Why do LM2902DR2G and LM324DR2G show no slew rate specification?

A: Slew rate data is not provided in the manufacturer specifications for these onsemi parts. Applications requiring specific slew rate performance should select alternatives with documented specifications (LM348DR at 0.5V/µs or LM224DT at 0.4V/µs).

Q: Can I use LM2902D or LM2902WDT for new production designs?

A: No. Both parts are designated Obsolete and do not support long-term supply chain continuity. New designs must select from Active status parts: LM348DR, LM224DT, LM324ADT, LM2902DR2G, or LM324DR2G.

Q: What is the impact of higher input bias current in LM2902DR2G and LM324DR2G?

A: Input bias current of 90 nA (versus 30 nA in LM348NSR) may affect precision applications requiring low input current. High-impedance signal sources or precision instrumentation circuits should prioritize LM348DR, LM224DT, or LM324ADT, which specify 20-30 nA input bias current.

Q: Are all substitute parts ROHS3 compliant?

A: All Active status parts (LM348DR, LM124DT, LM224D, LM224DT, LM2902DR2G, LM324ADT, LM324D, LM324DR2G) are ROHS3 compliant. Obsolete parts LM2902D and LM2902WDT have different compliance statuses and should not be used.

Q: Which substitute offers the highest inventory availability?

A: LM2902DR2G (onsemi) offers the highest inventory at 205,100 units, followed by LM324DR2G (onsemi) at 105,300 units. LM224DT (STMicroelectronics) provides 35,200 units. LM348DR (Texas Instruments) maintains 23,947 units.

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