LM348DG4 Equivalent & Substitute Parts

Part Overview

The LM348DG4 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 component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LM348DG4 serves applications requiring low-cost, general-purpose amplification with moderate performance specifications across industrial and commercial temperature ranges. Identifying equivalent and substitute parts is necessary due to product status constraints and to ensure design continuity and supply chain reliability.

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 LM348DG4 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

Amplifier type classification (General Purpose vs. J-FET)
Number of circuits (4-circuit configuration)
Slew rate performance (0.5 V/µs baseline)
Gain bandwidth product (1 MHz baseline)
Input bias current specifications (30 nA baseline)
Supply voltage range compatibility (minimum 8 V, maximum 36 V)
Output current capability per channel (25 mA baseline)
Operating temperature range (0°C to 70°C baseline)

Mechanical Compatibility Requirements:

Package type (14-SOIC surface mount)
Pin count and pinout configuration
Physical dimensions (0.154" width, 3.90mm)

Compliance Requirements:

RoHS3 compliance status
Product status (Active preferred over Obsolete or Last Time Buy)

Substitute parts are grouped into two categories: Direct Equivalents (matching all electrical and mechanical parameters with Active product status) and Functional Alternatives (meeting electrical requirements with acceptable parameter variations for specific applications).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Min (V)	Supply Max (V)	Output Current (mA)	Temp Range (°C)	Product Status	RoHS
LM348DG4	Texas Instruments	General Purpose	0.5	1	30	8	36	25	0 to 70	Last Time Buy	ROHS3
LM348D	onsemi	General Purpose	0.5	1	30	8	36	25	0 to 70	Obsolete	Non-compliant
LM348DR	Texas Instruments	General Purpose	0.5	1	30	8	36	25	0 to 70	Active	ROHS3
LF247DT	STMicroelectronics	J-FET	16	4	0.02	22	22	40	-40 to 105	Active	ROHS3
LF347D	STMicroelectronics	J-FET	16	3	0.02	22	22	40	0 to 70	Active	ROHS3
LF347DT	STMicroelectronics	J-FET	16	4	0.02	22	22	40	0 to 70	Active	ROHS3
LM224DT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	40	-40 to 105	Active	ROHS3
LM2902D	onsemi	General Purpose	0.5	1.2	20	3	26	30	-40 to 125	Obsolete	Non-compliant
LM2902QS14-13	Diodes Incorporated	General Purpose	0.3	0.7	20	2	36	40	-40 to 125	Active	ROHS3
LM324AD	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	30	0 to 70	Active	ROHS3
MC3303DR2G	onsemi	General Purpose	0.6	1	200	3	36	30	-40 to 85	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Preferred):

The LM348DR (Texas Instruments, Active status) is the primary direct equivalent. This part maintains identical electrical specifications to the LM348DG4 across all critical parameters: 0.5 V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, 8 V to 36 V supply range, and 25 mA output current per channel. The LM348DR is currently in Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Packaging is available in Cut Tape and Digi-Reel formats with 23,947 units in stock.

Secondary Equivalent (Limited Availability):

The LM348D (onsemi) provides identical electrical performance but carries Obsolete product status and RoHS non-compliance. This part should be considered only when LM348DR is unavailable and design timelines permit qualification of non-compliant components.

Functional Alternatives (Performance Enhancement):

The LF347DT and LF347D (STMicroelectronics, J-FET type) offer superior performance characteristics: 16 V/µs slew rate (32× faster), 3-4 MHz gain bandwidth product (3-4× higher), and 20 pA input bias current (1500× lower). These parts are suitable for applications requiring higher bandwidth, faster transient response, or ultra-low input bias current. Supply voltage range is fixed at ±22 V (symmetric), which differs from the LM348DG4's 8-36 V single-supply range. Both parts are Active with ROHS3 compliance.

Functional Alternatives (Extended Temperature Range):

The LM224DT (STMicroelectronics) and LM2902QS14-13 (Diodes Incorporated, AEC-Q100 automotive qualified) extend operating temperature to -40°C to 105°C and -40°C to 125°C respectively. Both are Active with ROHS3 compliance. The LM224DT maintains similar performance (0.4 V/µs slew rate, 1.3 MHz GBW) with lower supply voltage minimum (3 V). The LM2902QS14-13 features automotive qualification but with reduced performance (0.3 V/µs slew rate, 700 kHz GBW).

Not Recommended:

The MC3303DR2G exhibits significantly elevated input bias current (200 nA, 6.7× higher than LM348DG4), making it unsuitable for applications sensitive to input bias current specifications.

Frequently Asked Questions (FAQ)

Q: Can I use LM348D as a direct replacement for LM348DG4?

A: Electrically, yes. The LM348D provides identical performance specifications. However, LM348D is classified as Obsolete with RoHS non-compliance. Use only if LM348DR is unavailable and your application permits non-compliant components. Verify with your quality and compliance departments before implementation.

Q: What is the difference between LM348DR and LM348DG4?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The primary differences are packaging format (LM348DR is Cut Tape/Digi-Reel; LM348DG4 is Tube) and product status (LM348DR is Active; LM348DG4 is Last Time Buy). Electrically and functionally, they are equivalent.

Q: Can I substitute LF347DT for LM348DG4 in my design?

A: LF347DT is a functional alternative, not a direct equivalent. It offers superior performance (16 V/µs slew rate vs. 0.5 V/µs, 3 MHz GBW vs. 1 MHz, 20 pA input bias vs. 30 nA) but operates on symmetric ±22 V supplies instead of the LM348DG4's 8-36 V single supply. Use LF347DT only if your power supply architecture supports ±22 V operation and your application benefits from enhanced performance. Redesign may be required.

Q: What does "Last Time Buy" mean for the LM348DG4?

A: Last Time Buy indicates the manufacturer has discontinued production and will not accept new orders after a specified date. Existing inventory is limited (780 units). For new designs or long-term production, transition to LM348DR (Active status) to ensure supply continuity.

Q: Are all substitute parts RoHS3 compliant?

A: No. LM348D and LM2902D are RoHS non-compliant. All other listed substitutes (LM348DR, LF247DT, LF347D, LF347DT, LM224DT, LM2902QS14-13, LM324AD, MC3303DR2G) are ROHS3 compliant. Verify compliance requirements with your procurement and regulatory teams before selecting non-compliant alternatives.

Q: Can I use MC3303DR2G as a substitute?

A: MC3303DR2G is not recommended. While it matches the 4-circuit, general-purpose amplifier category and is Active with ROHS3 compliance, its input bias current is 200 nA—6.7 times higher than the LM348DG4's 30 nA specification. This elevated bias current will degrade performance in applications sensitive to input impedance or offset current, such as precision instrumentation or high-impedance signal conditioning circuits.

Q: What packaging formats are available for substitute parts?

A: Packaging varies by part number. LM348DR is available in Cut Tape and Digi-Reel formats. LF247DT is Tape & Reel. LF347D is Tube. LF347DT is Cut Tape & Digi-Reel. LM224DT is Cut Tape & Digi-Reel. LM2902QS14-13 is Tape & Reel. LM324AD is Tube. MC3303DR2G is Tape & Reel. Verify packaging compatibility with your assembly process before procurement.

Q: Do all substitutes use the same 14-SOIC package?

A: Yes. All listed substitute parts use 14-SOIC (0.154", 3.90mm width) surface-mount packaging with identical pinout and physical dimensions. Pin-for-pin compatibility is maintained across all substitutes, allowing direct PCB replacement without layout modifications.

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