LM348DRE4 Equivalent & Substitute Parts

Part Overview

The LM348DRE4 is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-SOIC surface-mount package. Manufactured by Texas Instruments, this device is designed for applications requiring low-cost, general-purpose amplification with moderate performance specifications.

The LM348DRE4 is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent substitute components. Active alternatives with comparable electrical characteristics and identical packaging are available from multiple manufacturers including STMicroelectronics and Rohm Semiconductor.

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)	8	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	—

Substitute Part Grouping Explanation

Substitution of the LM348DRE4 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Four independent amplifier circuits in single package
14-SOIC surface-mount package (0.154", 3.90mm width)
General-purpose amplifier topology
Supply voltage range compatibility (minimum 8V, maximum 36V)
Operating temperature range (0°C to 70°C minimum requirement)
RoHS3 compliance and MSL Level 1 rating

Secondary Compatibility Factors:

Slew rate ≥ 0.3 V/µs
Gain bandwidth product ≥ 800 kHz
Input bias current ≤ 30 nA
Output current per channel ≥ 25 mA

Substitute parts are grouped into two categories: Direct Replacements (identical base product with different packaging codes) and Functional Equivalents (alternative manufacturers with comparable performance specifications within the allowed parameter ranges).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LM348DRE4	Texas Instruments	General Purpose	0.5	1	30	8	36	0 to 70	Discontinued
LM348DR	Texas Instruments	General Purpose	0.5	1	30	8	36	0 to 70	Active
LF247DT	STMicroelectronics	J-FET	16	4	0.02	44	44	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	0.02	44	44	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	0.02	44	44	0 to 70	Active
LM124DT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	-55 to 125	Active
LM224D	STMicroelectronics	General Purpose	0.4	1.2	20	3	30	-40 to 105	Active
LM224DT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	-40 to 105	Active
LM2902DT	Rohm Semiconductor	General Purpose	0.3	0.8	20	3	32	-40 to 125	Not For New Designs
LM2902YDT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	-40 to 125	Active
LM324AD	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	0 to 70	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended Primary Choice):

LM348DR (Texas Instruments) is the direct active equivalent of the LM348DRE4. This part maintains identical electrical specifications, supply voltage range (8V to 36V), and operating temperature range (0°C to 70°C). The only difference is packaging format (Cut Tape & Digi-Reel versus the discontinued DRE4 variant). This part is currently in active production status with 23,947 units in stock. RoHS3 compliance and MSL Level 1 rating are maintained.

Tier 2 - Functional Equivalents (General Purpose, Active Status):

LM224DT and LM224D (STMicroelectronics) provide general-purpose amplification with comparable performance. These parts operate across a wider supply voltage range (3V to 30V) and extended temperature range (-40°C to 105°C). Slew rate is slightly reduced (0.4 V/µs versus 0.5 V/µs), and input bias current is lower (20 nA versus 30 nA). Both parts are in active production with high inventory availability (35,200 and 4,495 units respectively).

LM124DT (STMicroelectronics) offers the widest operating temperature range (-55°C to 125°C) among general-purpose alternatives, with active product status and 10,200 units in stock.

LM2902YDT (STMicroelectronics) provides automotive-grade qualification (AEC-Q100) with push-pull output configuration, suitable for applications requiring enhanced output drive capability (60 mA per channel versus 25 mA). Operating temperature range extends to -40°C to 125°C.

Tier 3 - Alternative Topology (J-FET Input):

LF347DT and LF347D (STMicroelectronics) employ J-FET input architecture, delivering significantly higher slew rate (16 V/µs) and gain bandwidth product (3-4 MHz). Input bias current is substantially lower (20 pA). These parts require symmetric ±22V supply configuration (44V total span) and are suitable only for applications with dual-supply architecture. Both are in active production status.

Not Recommended for New Designs:

LM2902DT (Rohm Semiconductor) carries "Not For New Designs" status despite active inventory (105,100 units). This designation indicates manufacturer discontinuation planning and should be avoided for new circuit development.

Frequently Asked Questions (FAQ)

Q: Can LM348DR directly replace LM348DRE4 without circuit modification?

A: Yes. LM348DR is the active production equivalent with identical electrical specifications and 14-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel). No circuit modifications are required.

Q: What is the key difference between LM348DR and LM224DT?

A: LM348DR maintains the original 8V to 36V supply range and 0.5 V/µs slew rate. LM224DT operates on 3V to 30V supplies with 0.4 V/µs slew rate. LM224DT is suitable for lower-voltage applications but cannot operate at the full 36V maximum of the original part. Verify supply voltage requirements before substitution.

Q: Are J-FET input amplifiers (LF347DT, LF247DT) compatible replacements?

A: J-FET amplifiers are functionally different. They require symmetric dual-supply configuration (±22V), not the single supply range of LM348DRE4. J-FET devices are suitable only for applications redesigned for dual-supply operation. Input bias current is dramatically lower (20 pA versus 30 nA), which may affect circuit behavior in high-impedance applications.

Q: What is the significance of "Not For New Designs" status on LM2902DT?

A: This designation indicates the manufacturer is discontinuing the product line. While inventory is currently available, future availability is not guaranteed. New designs should select parts with "Active" status to ensure long-term supply continuity.

Q: Can I use LM2902YDT in automotive applications?

A: LM2902YDT carries AEC-Q100 automotive qualification and is suitable for automotive-grade applications. Standard LM348DR and LM224DT variants lack automotive qualification. Verify application requirements before selecting automotive-qualified parts.

Q: What is the package compatibility across all substitute parts?

A: All listed substitute parts use 14-SOIC (0.154", 3.90mm width) surface-mount package. PCB footprints are mechanically compatible. Verify supplier device package designation (14-SOIC, 14-SO, 14-SOPJ) as minor pitch variations may exist between manufacturers.

Q: How do I determine which substitute is appropriate for my application?

A: Identify three critical parameters: (1) Required supply voltage range, (2) Operating temperature range, (3) Required slew rate and bandwidth. LM348DR is the direct replacement for standard 8V-36V supplies. LM224DT is suitable for 3V-30V supplies. LF347DT requires dual-supply configuration. Verify all three parameters match application requirements before selection.

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