LM348MX/NOPB Equivalent & Substitute Parts

Part Overview

The LM348MX/NOPB 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 part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LM348MX/NOPB 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, making it suitable for general signal conditioning and amplification applications within the specified operating temperature range of 0°C to 70°C.

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 (x4 Channels)	2.4	mA
Current - Output / Channel	25	mA
Voltage - Supply Span (Min)	36	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM348MX/NOPB is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

Amplifier Type: General Purpose
Number of Circuits: 4
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
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 (x4 Channels)
Current - Output / Channel: 25 mA

Substitution Categories:

Category 1: Direct Electrical & Mechanical Equivalents Parts that match all critical electrical parameters and package specifications. These include LM348D (onsemi) and LM348DR (Texas Instruments).

Category 2: Functional Equivalents with Extended Supply Range Parts that maintain general purpose amplifier functionality with 4 circuits in 14-SOIC packaging but feature expanded minimum supply voltage (8 V instead of 36 V fixed). These include LM348NSR (Texas Instruments, Last Time Buy status).

Category 3: Functional Equivalents with Modified Electrical Characteristics Parts that provide 4-circuit general purpose amplification in compatible packaging but with different electrical specifications. These include AS324AMTR-E1 and AS324AMTR-G1 (Diodes Incorporated), which feature lower supply current (1 mA vs 2.4 mA) and extended temperature range (-40°C to 85°C).

Category 4: Alternative Amplifier Technology Parts that provide 4-circuit amplification in compatible packaging using J-FET technology rather than standard bipolar design. These include LF247DT, LF347D, and LF347DT (STMicroelectronics), which feature significantly higher slew rate (16 V/µs) and gain bandwidth product (3-4 MHz).

Category 5: General Purpose Alternatives with Modified Specifications Parts that provide 4-circuit general purpose amplification with different electrical characteristics and extended temperature ranges. These include LM248DT (STMicroelectronics) and LM2902AQS14-13 (Diodes Incorporated, automotive qualified).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Span Min (V)	Supply Span Max (V)	Temp Range (°C)	Package	Status
LM348MX/NOPB	Texas Instruments	General Purpose	4	0.5	1	30	1	2.4	25	36	36	0 to 70	14-SOIC	Obsolete
LM348D	onsemi	General Purpose	4	0.5	1	30	1	2.4	25	8	36	0 to 70	14-SOIC	Obsolete
LM348DR	Texas Instruments	General Purpose	4	0.5	1	30	1	2.4	25	8	36	0 to 70	14-SOIC	Active
LM348NSR	Texas Instruments	General Purpose	4	0.5	1	30	1	2.4	25	8	36	0 to 70	14-SO	Last Time Buy
AS324AMTR-E1	Diodes Incorporated	General Purpose	4	—	—	20	2	1	40	3	36	-40 to 85	14-SOIC	Active
AS324AMTR-G1	Diodes Incorporated	General Purpose	4	—	—	20	2	1	40	3	36	-40 to 85	14-SO	Active
LF247DT	STMicroelectronics	J-FET	4	16	4	0.02	3	1.4	40	44	44	-40 to 105	14-SO	Active
LF347D	STMicroelectronics	J-FET	4	16	3	0.02	3	1.4	40	44	44	0 to 70	14-SO	Active
LF347DT	STMicroelectronics	J-FET	4	16	4	0.02	3	1.4	40	44	44	0 to 70	14-SO	Active
LM248DT	STMicroelectronics	General Purpose	4	0.5	1.3	30	1	2.1	25	44	44	-40 to 105	14-SO	Active
LM2902AQS14-13	Diodes Incorporated	General Purpose	4	0.3	0.7	20	2	1	40	2	36	-40 to 125	14-SO	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

LM348DR (Texas Instruments) is the primary recommended substitute. This part maintains all critical electrical specifications of the LM348MX/NOPB (0.5 V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, 1 mV input offset voltage, 2.4 mA supply current, 25 mA output current per channel) while offering active product status and ROHS3 compliance. The expanded minimum supply voltage (8 V vs. 36 V fixed) provides design flexibility without compromising performance. Inventory availability is substantial at 23,947 pieces.

LM348D (onsemi) provides identical electrical specifications and is available in tube packaging with 2,406 pieces in stock. However, this part carries RoHS non-compliant status, which may restrict use in regulated applications.

For Extended Temperature Range Applications:

AS324AMTR-E1 (Diodes Incorporated) operates across -40°C to 85°C and maintains 4-circuit general purpose amplification in 14-SOIC packaging. This part features lower supply current (1 mA vs. 2.4 mA), higher output current capability (40 mA vs. 25 mA), and extended minimum supply voltage (3 V). Input bias current is reduced to 20 nA, and input offset voltage is 2 mV. Active product status with 20,644 pieces available.

For High-Speed Applications:

LF347DT (STMicroelectronics) provides J-FET amplifier technology with 16 V/µs slew rate and 4 MHz gain bandwidth product, representing a 32-fold increase in slew rate and 4-fold increase in bandwidth compared to the LM348MX/NOPB. This part operates across 0°C to 70°C with active status and 27,321 pieces in inventory. Input bias current is dramatically reduced to 20 pA. Suitable for applications requiring higher frequency response and faster transient performance.

For Automotive and Extended Temperature Applications:

LM2902AQS14-13 (Diodes Incorporated) is AEC-Q100 qualified for automotive applications with operating range of -40°C to 125°C. This part features 4-circuit general purpose amplification with 0.3 V/µs slew rate and 700 kHz gain bandwidth product. Supply current is 1 mA with 40 mA output capability per channel. Active status with 13,466 pieces available.

For Compliance-Critical Applications:

All recommended active substitutes (LM348DR, AS324AMTR-E1, LF247DT, LF347DT, LM248DT, LM2902AQS14-13) carry ROHS3 compliance and REACH unaffected status, suitable for regulated markets and environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can LM348DR be used as a direct replacement for LM348MX/NOPB?

A: Yes. LM348DR maintains identical electrical specifications including 0.5 V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, 1 mV input offset voltage, 2.4 mA supply current, and 25 mA output current per channel. Both are 4-circuit general purpose amplifiers in 14-SOIC surface mount packaging. LM348DR offers active product status and expanded minimum supply voltage (8 V), providing design flexibility. ROHS3 compliance is maintained.

Q: What is the difference between LM348NSR and LM348DR?

A: LM348NSR and LM348DR share identical electrical specifications but differ in packaging format and product status. LM348NSR uses 14-SO packaging (0.209", 5.30mm width) versus 14-SOIC (0.154", 3.90mm width) for LM348DR. LM348NSR carries Last Time Buy status, indicating limited future availability, while LM348DR is active. For new designs, LM348DR is preferred.

Q: Can AS324AMTR-E1 replace LM348MX/NOPB in all applications?

A: AS324AMTR-E1 provides functional equivalence as a 4-circuit general purpose amplifier in 14-SOIC packaging with active status. However, electrical specifications differ: supply current is reduced to 1 mA (vs. 2.4 mA), output current is increased to 40 mA (vs. 25 mA), input bias current is 20 nA (vs. 30 nA), and input offset voltage is 2 mV (vs. 1 mV). Operating temperature range extends to -40°C to 85°C. Substitution is valid where these parameter differences are acceptable to the application.

Q: What are the advantages of LF347DT over LM348MX/NOPB?

A: LF347DT employs J-FET amplifier technology providing significantly enhanced performance: slew rate of 16 V/µs (32× faster), gain bandwidth product of 4 MHz (4× higher), and input bias current of 20 pA (1500× lower). These characteristics suit high-frequency and precision applications. Operating temperature range is 0°C to 70°C, matching the original part. Trade-offs include higher supply voltage span (44 V fixed) and different package designation (14-SO vs. 14-SOIC).

Q: Is LM2902AQS14-13 suitable for automotive applications?

A: Yes. LM2902AQS14-13 carries AEC-Q100 qualification and is specifically designed for automotive applications. It provides 4-circuit general purpose amplification with extended operating temperature range of -40°C to 125°C. Supply current is 1 mA with 40 mA output capability per channel. ROHS3 compliance and REACH unaffected status are maintained. This part is recommended for automotive and industrial applications requiring temperature extremes.

Q: What packaging differences exist among substitute parts?

A: The primary packaging variants are 14-SOIC (0.154", 3.90mm width) and 14-SO (0.209", 5.30mm width). LM348MX/NOPB, LM348DR, and AS324AMTR-E1 use 14-SOIC. LM348NSR, LF247DT, LF347D, LF347DT, LM248DT, and LM2902AQS14-13 use 14-SO. Both are surface mount packages with 14 pins. Physical board layout and footprint compatibility must be verified before substitution.

Q: Which substitute offers the lowest power consumption?

A: AS324AMTR-E1 and AS324AMTR-G1 offer the lowest supply current at 1 mA (x4 channels), compared to 2.4 mA for LM348MX/NOPB. LM2902AQS14-13 also provides 1 mA supply current. LF247DT and LF347D/LF347DT offer 1.4 mA. For power-constrained applications, these options are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: All active status substitute parts (LM348DR, AS324AMTR-E1, AS324AMTR-G1, LF247DT, LF347D, LF347DT, LM248DT, LM2902AQS14-13) carry ROHS3 compliance. LM348D (onsemi) is RoHS non-compliant. LM348NSR is ROHS3 compliant but carries Last Time Buy status.

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