LM348D Equivalent & Substitute Parts

Part Overview

The LM348D 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 remaining inventory of 2406 pieces. The LM348D operates across a supply voltage range of 8V to 36V and is suitable for applications requiring moderate bandwidth and low input bias current characteristics. Due to its Last Time Buy status, identification of functionally equivalent substitute components is necessary for design continuity and long-term supply chain planning.

Key Parameters

Parameter	LM348D 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	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute components for the LM348D are evaluated based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Number of circuits: Must be 4
Package type: Must be 14-SOIC or 14-SO (mechanically compatible)
Mounting type: Must be Surface Mount
Supply voltage range: Must encompass or exceed 8V to 36V minimum requirement
Operating temperature range: Must support 0°C to 70°C minimum
RoHS compliance: Must maintain ROHS3 Compliant status

Secondary Performance Parameters:

Slew rate, gain bandwidth product, input bias current, and output current capacity determine application suitability within the same amplifier type category

Substitutes are grouped into two categories: Direct General-Purpose Replacements (identical amplifier type) and Enhanced Performance Alternatives (J-FET technology with superior specifications).

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)	Packaging	Product Status
LM348D	Texas Instruments	General Purpose	0.5	1	30	8	36	0 to 70	Tube	Last Time Buy
LM348DR	Texas Instruments	General Purpose	0.5	1	30	8	36	0 to 70	Cut Tape & Digi-Reel	Active
LM224D	STMicroelectronics	General Purpose	0.4	1.2	20	3	30	-40 to 105	Tube	Active
LM224DT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	-40 to 105	Cut Tape & Digi-Reel	Active
LM224ADT	STMicroelectronics	General Purpose	0.4	1.3	20	3	30	-40 to 105	Cut Tape & Digi-Reel	Active
LM248DT	STMicroelectronics	General Purpose	0.5	1.3	30	±22	±22	-40 to 105	Tape & Reel	Active
LF247DT	STMicroelectronics	J-FET	16	4	0.02	±22	±22	-40 to 105	Cut Tape & Digi-Reel	Active
LF347D	STMicroelectronics	J-FET	16	3	0.02	±22	±22	0 to 70	Tube	Active
LF347DT	STMicroelectronics	J-FET	16	4	0.02	±22	±22	0 to 70	Cut Tape & Digi-Reel	Active
LM2902AQS14-13	Diodes Incorporated	General Purpose	0.3	0.7	20	2	36	-40 to 125	Tape & Reel	Active
LM2902D	onsemi	General Purpose	0.5	1.2	20	3	26	-40 to 125	Tube	Obsolete

Engineering Selection Recommendations

Tier 1: Direct Replacement (Identical Specifications)

LM348DR is the primary substitute for LM348D. Both components are manufactured by Texas Instruments with identical electrical specifications: 0.5V/µs slew rate, 1 MHz gain bandwidth product, 30 nA input bias current, and 8V to 36V supply range. The only difference is packaging format: LM348DR is supplied in Cut Tape & Digi-Reel format with 23,947 units in stock, compared to LM348D Tube packaging with 2,406 units. This substitute maintains full compatibility for all applications and is recommended as the primary alternative due to Active product status and superior inventory availability.

Tier 2: General-Purpose Alternatives (Active Status)

LM224 series components (LM224D, LM224DT, LM224ADT) manufactured by STMicroelectronics provide functional substitution with extended operating temperature range (-40°C to 105°C versus 0°C to 70°C). These devices maintain 4-circuit configuration and 14-SOIC packaging. Performance characteristics differ slightly: 0.4V/µs slew rate (versus 0.5V/µs), 1.2-1.3 MHz gain bandwidth product (versus 1 MHz), and 20 nA input bias current (versus 30 nA). Supply voltage range is reduced to 3V to 30V, which does not encompass the full 8V to 36V range of LM348D. These substitutes are suitable for applications operating within 3V to 30V supply range and requiring extended temperature performance.

LM248DT (STMicroelectronics) offers identical 0.5V/µs slew rate and 30 nA input bias current to LM348D. However, supply voltage is specified as ±22V (symmetric), which differs from the 8V to 36V single-supply range of LM348D. This component is suitable for dual-supply applications only.

LM2902AQS14-13 (Diodes Incorporated) is an automotive-grade component with AEC-Q100 qualification. It supports 2V to 36V supply range, encompassing LM348D requirements. However, slew rate is reduced to 0.3V/µs and gain bandwidth product to 700 kHz. This substitute is appropriate for automotive applications requiring extended temperature range (-40°C to 125°C) and lower performance specifications.

Tier 3: Enhanced Performance Alternatives (J-FET Technology)

LF347 series components (LF347D, LF347DT) and LF247DT (all STMicroelectronics) employ J-FET input architecture, delivering superior performance: 16V/µs slew rate (32× faster), 3-4 MHz gain bandwidth product (3-4× higher), and 20 pA input bias current (1500× lower). These devices are suitable for applications requiring high-speed operation and extremely low input bias current. Supply voltage is specified as ±22V (symmetric dual-supply), requiring circuit redesign for single-supply applications. Operating temperature range extends to -40°C to 105°C (LF247DT) or 0°C to 70°C (LF347D, LF347DT).

Compliance and Certification:

All recommended substitutes maintain ROHS3 Compliant status and Moisture Sensitivity Level 1 (Unlimited). LM2902AQS14-13 includes AEC-Q100 automotive qualification. LM2902D (onsemi) is marked Obsolete and is not recommended for new designs despite availability of 3,155 units.

Frequently Asked Questions (FAQ)

Q1: Can LM348DR be used as a direct replacement for LM348D without circuit modification?

A: Yes. LM348DR is electrically identical to LM348D with matching specifications across all critical parameters: slew rate, gain bandwidth product, input bias current, supply voltage range, and operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). No circuit modification is required. Both components are manufactured by Texas Instruments and are pin-compatible in 14-SOIC packages.

Q2: What is the key limitation when substituting LM224 series for LM348D?

A: The LM224 series has a reduced maximum supply voltage of 30V compared to LM348D's 36V maximum. Applications requiring operation at supply voltages between 30V and 36V cannot use LM224 substitutes. Additionally, the minimum supply voltage is 3V (versus 8V for LM348D), which is not a limitation for most applications. LM224 series offers extended operating temperature range (-40°C to 105°C) as a compensating advantage.

Q3: Are J-FET amplifiers (LF347, LF247) suitable replacements for general-purpose applications?

A: J-FET amplifiers provide superior performance characteristics but require careful circuit evaluation. Key differences include: (1) Supply voltage is symmetric ±22V dual-supply only, requiring circuit redesign for single-supply applications; (2) Slew rate is 16V/µs (32× faster), which may cause stability issues in circuits designed for 0.5V/µs; (3) Input bias current is 20 pA (1500× lower), eliminating bias current compensation requirements. J-FET substitutes are appropriate only for applications specifically designed to exploit these performance advantages or where the enhanced specifications do not create compatibility issues.

Q4: What is the difference between LM348D Tube and LM348DR Cut Tape packaging?

A: Both are identical components with identical electrical specifications. Packaging format affects handling, storage, and assembly processes only. Tube packaging contains components in a plastic tube suitable for manual handling and small-quantity assembly. Cut Tape & Digi-Reel format is optimized for automated pick-and-place assembly equipment. Selection depends on manufacturing process requirements, not electrical performance.

Q5: Can LM2902AQS14-13 be used in automotive applications where LM348D was previously specified?

A: LM2902AQS14-13 is automotive-qualified (AEC-Q100) and supports the 8V to 36V supply range required by LM348D. However, performance specifications differ: slew rate is 0.3V/µs (versus 0.5V/µs) and gain bandwidth product is 700 kHz (versus 1 MHz). This substitute is suitable for automotive applications where these reduced performance specifications are acceptable. Extended operating temperature range (-40°C to 125°C) is an additional benefit for automotive environments.

Q6: Why is LM2902D (onsemi) not recommended despite available inventory?

A: LM2902D is marked as Obsolete, indicating discontinued production and no manufacturer support. While 3,155 units remain in stock, using obsolete components in new designs creates long-term supply chain risk and potential qualification issues. Active-status alternatives with superior inventory levels are available and recommended for design continuity.

Q7: What parameters must match for a component to be considered a true substitute for LM348D?

A: True substitutes must match: (1) Number of circuits: 4; (2) Package type: 14-SOIC or 14-SO (mechanically compatible); (3) Mounting type: Surface Mount; (4) Supply voltage range: Must support minimum 8V and maximum 36V; (5) Operating temperature: Must support 0°C to 70°C minimum; (6) RoHS compliance: ROHS3 Compliant. Performance parameters (slew rate, bandwidth, input bias current) may vary within acceptable application limits but should be evaluated for specific circuit requirements.

Q8: Is the LM248DT suitable for single-supply applications?

A: No. LM248DT is specified with ±22V symmetric supply voltage, indicating dual-supply operation only. This component is not suitable for single-supply applications where LM348D operates from 8V to 36V. Dual-supply operation requires both positive and negative supply rails, fundamentally different from single-supply circuits. Circuit redesign would be necessary to use LM248DT in applications previously designed for LM348D single-supply operation.

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