LM348DRG4 Equivalent & Substitute Parts

Part Overview

The LM348DRG4 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 discontinued at DiGi Electronics, indicating limited availability through primary distribution channels. The 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, suitable for general analog signal processing applications requiring moderate bandwidth and low input bias current characteristics.

Due to discontinued status, equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and maintenance applications.

Key Parameters

Parameter	LM348DRG4 Value	Unit
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 (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
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the LM348DRG4 is based on the following critical parameters that must align for functional equivalence:

Primary Substitution Criteria:

Number of circuits: 4 (quad configuration required)
Package type: 14-SOIC surface mount form factor
Amplifier classification: General Purpose or J-FET topology
Supply voltage range compatibility: Minimum 8V to 36V maximum span
Operating temperature range: Minimum 0°C to 70°C coverage

Secondary Compatibility Parameters:

Slew rate: 0.5V/µs or higher acceptable
Gain bandwidth product: 1 MHz or higher acceptable
Input bias current: 30 nA or lower preferred
Input offset voltage: 1 mV or lower preferred
Output current per channel: 25 mA or higher acceptable

Substitute parts are grouped into two categories: direct general-purpose replacements maintaining identical electrical characteristics, and enhanced-performance alternatives offering superior specifications while maintaining backward compatibility within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Status
LM348DRG4	Texas Instruments	General Purpose	0.5	1	30	1	8	36	0 to 70	Discontinued
LM348DR	Texas Instruments	General Purpose	0.5	1	30	1	8	36	0 to 70	Active
ADA4004-4ARZ	Analog Devices Inc.	General Purpose	2.7	12	40	0.04	10	30	-40 to 125	Active
AS324MTR-G1	Diodes Incorporated	General Purpose	—	—	20	2	3	36	-40 to 85	Active
LF247DT	STMicroelectronics	J-FET	16	4	0.02	3	44	44	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	0.02	3	44	44	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	0.02	3	44	44	0 to 70	Active
LM224DR2G	onsemi	General Purpose	—	1	90	2	3	32	-25 to 85	Active
LM2902EDR2G	onsemi	General Purpose	—	—	90	2	3	32	-40 to 105	Active
LM2902VDR2G	onsemi	General Purpose	—	1	90	2	3	32	-40 to 125	Active
LM324AD	STMicroelectronics	General Purpose	0.4	1.3	20	2	3	30	0 to 70	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Specifications):

LM348DR from Texas Instruments is the primary recommended substitute. This part maintains identical electrical specifications to the LM348DRG4 across all critical parameters: 0.5V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, and 8V to 36V supply range. The part is currently active in production with 23,947 units in stock, ensuring long-term availability. Packaging is 14-SOIC surface mount, identical to the original. This substitution requires no circuit redesign or validation.

Tier 2 - Enhanced Performance Substitutes (Backward Compatible):

LM324AD from STMicroelectronics provides general-purpose amplification with slightly improved specifications: 1.3 MHz gain bandwidth product and 20 nA input bias current. Supply range is 3V to 30V, which overlaps the original 8V to 36V range within the 8V to 30V window. Operating temperature matches 0°C to 70°C. This part is suitable for applications where the original supply voltage does not exceed 30V.

AS324MTR-G1 from Diodes Incorporated offers extended supply voltage range (3V to 36V) with lower input bias current (20 nA) and higher output current capability (40 mA). Operating temperature extends to -40°C to 85°C. This part is suitable for applications requiring lower supply voltages or extended temperature operation.

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

LF247DT, LF347D, and LF347DT from STMicroelectronics represent J-FET input amplifier alternatives. These parts offer significantly higher slew rate (16V/µs), lower input bias current (20 pA), and extended operating temperature ranges. However, supply voltage is fixed at 44V, requiring circuit redesign for applications using the original 8V to 36V range. These substitutes are appropriate only for designs that can accommodate fixed 44V supply operation.

Tier 4 - Low-Voltage General Purpose (Conditional):

LM224DR2G, LM2902EDR2G, and LM2902VDR2G from onsemi are general-purpose amplifiers with supply range starting at 3V minimum. These parts accommodate the original 8V to 36V range only up to 32V maximum, making them suitable for applications not exceeding 32V supply. Input bias current is higher at 90 nA compared to the original 30 nA specification.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory classification. Moisture sensitivity level remains at MSL 1 (Unlimited) for all recommended substitutes, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LM348DR be used as a direct drop-in replacement for LM348DRG4?

A: Yes. LM348DR is electrically and mechanically identical to LM348DRG4. Both are 14-SOIC surface mount packages with identical pin configurations, electrical specifications, and operating ranges. No circuit modifications are required. The primary difference is product status: LM348DR is currently active in production while LM348DRG4 is discontinued.

Q: What is the key difference between general-purpose and J-FET input amplifiers in this comparison?

A: General-purpose amplifiers (LM348, LM324, AS324, LM224, LM2902) use bipolar input stages with input bias currents in the nanoampere range (20-90 nA). J-FET input amplifiers (LF247, LF347) use field-effect transistor input stages with input bias currents in the picoampere range (20 pA), approximately 1000 times lower. J-FET devices offer superior input impedance but require fixed 44V supply voltage in this product line.

Q: Can I substitute ADA4004-4ARZ for LM348DRG4 in all applications?

A: ADA4004-4ARZ offers enhanced performance with 12 MHz gain bandwidth product versus 1 MHz, and 2.7V/µs slew rate versus 0.5V/µs. However, supply voltage range is 10V to 30V, which does not accommodate the original part's 8V minimum or 36V maximum specifications. This substitute is suitable only for applications operating within the 10V to 30V window. Operating temperature extends to -40°C to 125°C, providing wider temperature coverage than the original 0°C to 70°C range.

Q: What packaging options are available for LM348 equivalent parts?

A: All substitute parts maintain 14-SOIC (0.154", 3.90mm width) surface mount packaging, identical to the original LM348DRG4. Packaging variations exist only in distribution format: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), or Tube. These distribution formats do not affect electrical performance or PCB assembly compatibility.

Q: Which substitute offers the lowest input bias current?

A: LF247DT and LF347DT from STMicroelectronics offer the lowest input bias current at 20 pA (picoamperes), approximately 1500 times lower than the original LM348DRG4 at 30 nA. This ultra-low bias current is achieved through J-FET input stage technology. However, these parts require fixed 44V supply operation, incompatible with the original 8V to 36V range.

Q: Are there supply voltage limitations when selecting a substitute?

A: Yes. The original LM348DRG4 operates from 8V to 36V. Substitutes vary: LM348DR matches this range exactly. ADA4004-4ARZ operates 10V to 30V (incompatible below 10V and above 30V). AS324MTR-G1 and LF247DT/LF347DT accommodate the full range but with different upper limits. LM224DR2G, LM2902EDR2G, and LM2902VDR2G operate 3V to 32V (incompatible above 32V). Verify your application's supply voltage requirements before selection.

Q: What is the significance of Moisture Sensitivity Level (MSL) in component selection?

A: MSL indicates the maximum time a component can be exposed to moisture at specified temperature and humidity before soldering. The original LM348DRG4 and all recommended substitutes carry MSL 1 (Unlimited), meaning no time restriction on moisture exposure. This simplifies inventory management and reduces risk of moisture-induced failures during storage and assembly.

Q: Can I use LM324AD as a substitute if my application requires 36V supply?

A: No. LM324AD maximum supply voltage is 30V, making it incompatible with applications requiring 36V operation. The original LM348DRG4 supports up to 36V. For 36V applications, use LM348DR (direct replacement), AS324MTR-G1, or LF247DT/LF347DT series.

Q: What is the difference between LF347D and LF347DT?

A: Both are J-FET input amplifiers from STMicroelectronics with identical electrical specifications: 16V/µs slew rate, 4 MHz gain bandwidth product, and 20 pA input bias current. The difference is packaging distribution format: LF347D is supplied in Tube packaging, while LF347DT is supplied in Cut Tape (CT) & Digi-Reel format. Electrical performance and PCB compatibility are identical.

Q: Which substitute offers the highest output current capability?

A: AS324MTR-G1 and LF247DT/LF347DT series offer 40 mA output current per channel, compared to the original LM348DRG4 at 25 mA. This 60% increase in output current capability may be beneficial for applications requiring higher load drive capability, provided other electrical parameters remain compatible with your design.

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