LM248D Equivalent & Substitute Parts Reference

Part Overview

The LM248D 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 (1205 pcs). The LM248D operates across a wide 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, identifying functionally equivalent substitute parts is essential for design continuity and long-term component availability.

Key Parameters

Parameter	LM248D Value	Unit	Substitution Relevance
Amplifier Type	General Purpose	—	Critical
Number of Circuits	4	Channels	Critical
Package / Case	14-SOIC (0.154", 3.90mm Width)	—	Critical
Slew Rate	0.5	V/µs	Important
Gain Bandwidth Product	1	MHz	Important
Current - Input Bias	30	nA	Important
Voltage - Input Offset	1	mV	Important
Current - Output / Channel	25	mA	Important
Voltage - Supply Span (Min)	8	V	Important
Voltage - Supply Span (Max)	36	V	Important
Operating Temperature	-25°C ~ 85°C	—	Important
Mounting Type	Surface Mount	—	Critical
RoHS Status	ROHS3 Compliant	—	Important

Substitute Part Grouping Explanation

Substitution of the LM248D is determined by strict adherence to the following criteria:

Critical Parameters (Must Match):

Amplifier Type: General Purpose
Number of Circuits: 4
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Important Parameters (Must Be Compatible):

Slew Rate: Equal to or greater than 0.5 V/µs
Gain Bandwidth Product: Equal to or greater than 1 MHz
Current - Input Bias: Equal to or less than 30 nA (lower is acceptable)
Voltage - Input Offset: Equal to or less than 1 mV (lower is acceptable)
Current - Output / Channel: Equal to or greater than 25 mA
Voltage - Supply Span: Must encompass or exceed 8V to 36V range
Operating Temperature: Must cover or exceed -25°C to 85°C range
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Same Amplifier Type): Parts maintaining General Purpose amplifier classification with identical or superior electrical characteristics within the specified parameter ranges.

Category B - Functional Alternatives (Different Amplifier Type): Parts with different amplifier technology (J-FET) that meet all critical package and circuit requirements but may exhibit different electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LM248D	Texas Instruments	General Purpose	0.5	1	30	1	25	8	36	-25 ~ 85	Last Time Buy
LM248DR	Texas Instruments	General Purpose	0.5	1	30	1	25	8	36	-25 ~ 85	Active
ADA4004-4ARZ	Analog Devices Inc.	General Purpose	2.7	12	40	0.04	10	10	30	-40 ~ 125	Active
AS324AMTR-G1	Diodes Incorporated	General Purpose	—	—	20	2	40	3	36	-40 ~ 85	Active
AS324MTR-G1	Diodes Incorporated	General Purpose	—	—	20	2	40	3	36	-40 ~ 85	Active
LF247DT	STMicroelectronics	J-FET	16	4	0.02	3	40	44	44	-40 ~ 105	Active
LF347D	STMicroelectronics	J-FET	16	3	0.02	3	40	44	44	0 ~ 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	0.02	3	40	44	44	0 ~ 70	Active
LM124DT	STMicroelectronics	General Purpose	0.4	1.3	20	2	40	3	30	-55 ~ 125	Active
LM224ADT	STMicroelectronics	General Purpose	0.4	1.3	20	2	40	3	30	-40 ~ 105	Active
LM224DR2G	onsemi	General Purpose	—	1	90	2	40	3	32	-25 ~ 85	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Replacement:

LM248DR (Texas Instruments) is the primary recommended substitute. This part is electrically identical to the LM248D, sharing all critical specifications including slew rate, gain bandwidth product, input bias current, and input offset voltage. The LM248DR maintains the same 8V to 36V supply range and -25°C to 85°C operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube), which does not affect electrical performance. Product status is Active with 9197 pcs in stock, ensuring long-term availability. RoHS3 compliance and REACH unaffected status are maintained.

Tier 2 - Compatible General Purpose Alternatives:

AS324MTR-G1 (Diodes Incorporated) provides a functionally compatible substitute with superior output current capability (40 mA versus 25 mA) and lower input bias current (20 nA versus 30 nA). This part operates across 3V to 36V supply range, which encompasses the LM248D specification. Operating temperature range is -40°C to 85°C. Inventory availability is substantial (196751 pcs). MSL rating is 1 (Unlimited), indicating superior moisture handling. This part is suitable for applications where the extended lower supply voltage limit is not required.

AS324AMTR-G1 (Diodes Incorporated) offers similar characteristics to AS324MTR-G1 with identical electrical specifications but different packaging (Tape & Reel versus standard). Selection between these two Diodes parts depends on procurement and assembly requirements.

LM224ADT (STMicroelectronics) is compatible with slightly reduced slew rate (0.4 V/µs versus 0.5 V/µs) and gain bandwidth product (1.3 MHz versus 1 MHz). Supply range is 3V to 30V, which does not fully encompass the LM248D maximum of 36V. Operating temperature extends to -40°C to 105°C. This part is suitable for applications not requiring the full 36V supply capability.

LM124DT (STMicroelectronics) exhibits similar performance to LM224ADT with extended operating temperature range (-55°C to 125°C). Supply range limitation (3V to 30V) applies identically.

Tier 3 - J-FET Technology Alternatives:

LF247DT, LF347D, and LF347DT (STMicroelectronics) represent J-FET amplifier technology with significantly superior slew rate (16 V/µs) and dramatically lower input bias current (20 pA versus 30 nA). These parts are suitable for applications requiring high-impedance input stages or fast signal processing. However, supply voltage specification is fixed at 44V (both minimum and maximum), which differs fundamentally from the LM248D variable range. Operating temperature ranges vary (LF347D and LF347DT: 0°C to 70°C; LF247DT: -40°C to 105°C). Selection of J-FET alternatives requires verification that fixed 44V supply operation is compatible with system design.

ADA4004-4ARZ (Analog Devices Inc.) offers enhanced performance with 2.7 V/µs slew rate, 12 MHz gain bandwidth product, and exceptional input offset voltage (40 µV). Supply range is 10V to 30V, which does not encompass the LM248D minimum of 8V. Operating temperature range is -40°C to 125°C. MSL rating is 3 (168 Hours), requiring controlled moisture exposure during storage and assembly. This part is suitable for precision applications where the supply voltage limitation is acceptable.

LM224DR2G (onsemi) maintains 1 MHz gain bandwidth product matching the LM248D but exhibits higher input bias current (90 nA versus 30 nA). Supply range is 3V to 32V. This part is suitable for cost-optimized designs where input bias current specification is not critical.

Selection Criteria Summary:

For direct pin-compatible replacement with identical specifications: LM248DR
For extended availability with superior output current: AS324MTR-G1
For high-speed applications with fixed 44V supply: LF247DT or LF347DT
For precision low-offset applications: ADA4004-4ARZ (verify 10V minimum supply compatibility)
For cost optimization: LM224DR2G (verify higher input bias current tolerance)

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance across automotive, industrial, and consumer applications.

Frequently Asked Questions (FAQ)

Q1: Can LM248DR be used as a direct drop-in replacement for LM248D?

A: Yes. LM248DR is electrically identical to LM248D across all specified parameters. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube). Both parts are manufactured by Texas Instruments, share the same base product number (LM248), and maintain identical electrical characteristics including slew rate (0.5 V/µs), gain bandwidth product (1 MHz), input bias current (30 nA), and supply voltage range (8V to 36V). PCB layout and circuit design require no modification.

Q2: What is the key difference between AS324MTR-G1 and LM248D?

A: AS324MTR-G1 maintains the same 4-circuit general-purpose amplifier configuration in 14-SOIC packaging but exhibits lower input bias current (20 nA versus 30 nA) and higher output current capability (40 mA versus 25 mA). The supply voltage minimum is reduced to 3V, which may be advantageous for low-voltage applications. However, slew rate and gain bandwidth product specifications are not provided for AS324MTR-G1, requiring verification against application requirements. Operating temperature range is -40°C to 85°C, matching the LM248D lower limit.

Q3: Why would J-FET alternatives like LF247DT be considered instead of general-purpose types?

A: J-FET amplifiers offer dramatically lower input bias current (20 pA versus 30 nA for LM248D), making them suitable for high-impedance input applications such as precision instrumentation, sensor interfaces, and photodiode amplifiers. LF247DT also provides superior slew rate (16 V/µs versus 0.5 V/µs), enabling faster signal processing. However, the fixed 44V supply specification differs from LM248D's variable 8V to 36V range, requiring system redesign. Selection of J-FET alternatives is application-specific and not recommended for general-purpose replacement.

Q4: Is ADA4004-4ARZ compatible with systems designed for LM248D?

A: ADA4004-4ARZ is partially compatible. It maintains the 4-circuit general-purpose amplifier configuration in 14-SOIC packaging and offers superior performance (2.7 V/µs slew rate, 12 MHz gain bandwidth product, 40 µV input offset voltage). However, the supply voltage range is 10V to 30V, which does not encompass the LM248D minimum of 8V. If the system operates above 10V, ADA4004-4ARZ is suitable. If 8V to 10V operation is required, this part is not compatible. Additionally, MSL rating is 3 (168 Hours), requiring controlled moisture handling during storage and assembly.

Q5: What does "Last Time Buy" status mean for LM248D, and why is substitution planning important?

A: Last Time Buy indicates that Texas Instruments has discontinued production of LM248D and will not manufacture additional units beyond current inventory (1205 pcs). Once inventory is exhausted, the part becomes unavailable. For designs currently using LM248D or planning new designs, identifying and qualifying substitute parts is essential to ensure long-term component availability and production continuity. LM248DR (Active status) is the recommended path forward, as it is electrically identical and manufactured by the same supplier.

Q6: Can LM224ADT be used in applications requiring the full 8V to 36V supply range of LM248D?

A: No. LM224ADT supply voltage range is 3V to 30V, which does not encompass the LM248D maximum of 36V. If the application requires operation at supply voltages between 30V and 36V, LM224ADT is not suitable. For applications operating within 3V to 30V, LM224ADT is compatible, though slew rate (0.4 V/µs) is slightly lower than LM248D (0.5 V/µs).

Q7: What is the significance of RoHS3 compliance and REACH status for substitute part selection?

A: RoHS3 compliance indicates that the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. REACH Unaffected status indicates the part is not subject to Registration, Evaluation, Authorization, and Restriction of Chemicals regulations. All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance for automotive, industrial, and consumer applications. These certifications are mandatory for most commercial and industrial markets.

Q8: How does packaging format (Tube versus Cut Tape & Digi-Reel®) affect part selection?

A: Packaging format affects procurement, storage, and assembly processes but does not impact electrical performance. Tube packaging is suitable for manual assembly or small-volume production. Cut Tape & Digi-Reel® packaging is optimized for automated pick-and-place assembly and high-volume production. LM248D is supplied in Tube format, while LM248DR is available in Cut Tape & Digi-Reel® format. Selection depends on manufacturing process requirements. Both formats are electrically identical.

Q9: What is MSL (Moisture Sensitivity Level), and why does it matter for substitute selection?

A: MSL indicates the maximum time a component can be exposed to moisture at specified temperature and humidity conditions before soldering. MSL 1 (Unlimited) means no moisture exposure restrictions. MSL 3 (168 Hours) means the part must be soldered within 168 hours of opening the moisture barrier bag. LM248D and most recommended substitutes have MSL 1, requiring no special moisture handling. ADA4004-4ARZ has MSL 3, requiring controlled storage and assembly procedures. Selection of MSL 3 parts requires verification that manufacturing processes can accommodate moisture control requirements.

Q10: Are there any substitutes that fully match LM248D across all parameters without any trade-offs?

A: Yes. LM248DR is a complete electrical and functional equivalent to LM248D. It shares identical specifications for slew rate, gain bandwidth product, input bias current, input offset voltage, output current, supply voltage range, and operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube), which is a procurement and assembly consideration, not an electrical one. LM248DR is the recommended primary substitute for direct replacement.

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