LM248N Equivalent & Substitute Parts

Part Overview

The LM248N is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-DIP package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support legacy system maintenance where the LM248N is specified in existing applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM248N
Manufacturer	STMicroelectronics
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Slew Rate	0.5 V/µs
Gain Bandwidth Product	1.3 MHz
Current - Input Bias	30 nA
Voltage - Input Offset	1 mV
Current - Supply	2.1 mA (x4 Channels)
Current - Output / Channel	25 mA
Voltage - Supply Span	44 V (Min: 44 V, Max: 44 V)
Operating Temperature	-40°C ~ 105°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM248N is determined by strict alignment of electrical and mechanical parameters within the operational amplifier category. The primary substitution criteria are:

Mechanical Compatibility:

Package type: 14-DIP (0.300", 7.62mm) form factor
Mounting type: Through Hole
Pin count and pinout configuration

Electrical Compatibility:

Number of circuits: 4 independent amplifier stages
Amplifier type classification: General Purpose or J-FET variants
Supply voltage span: Minimum 44 V capability or compatible range
Operating temperature range: Support for -40°C ~ 105°C or overlapping range
Output current per channel: Minimum 25 mA capability
Input bias current: Within acceptable range for application
Gain bandwidth product: Minimum 1.3 MHz or higher

Regulatory & Compliance:

RoHS3 compliance status
REACH compliance status
Moisture sensitivity level compatibility

Substitute parts are grouped into two categories: direct equivalents (same amplifier type and performance class) and functional alternatives (different amplifier type but compatible electrical parameters).

Parameter Comparison

Parameter	LM248N	LM224AN	LF444ACN/NOPB	LM324NE4	LT1058CN#PBF	LT1114CN#PBF
Manufacturer	STMicroelectronics	STMicroelectronics	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	J-FET	General Purpose	J-FET	General Purpose
Number of Circuits	4	4	4	4	4	4
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Slew Rate	0.5 V/µs	0.4 V/µs	1 V/µs	Not Specified	13 V/µs	0.3 V/µs
Gain Bandwidth Product	1.3 MHz	1.3 MHz	1 MHz	1.2 MHz	5 MHz	750 kHz
Current - Input Bias	30 nA	20 nA	10 pA	45 nA	7 pA	70 pA
Voltage - Input Offset	1 mV	2 mV	2 mV	2 mV	250 µV	20 µV
Current - Supply	2.1 mA (x4 Channels)	1.5 mA	600 µA (x4 Channels)	1.5 mA	1.7 mA (x4 Channels)	350 µA (x4 Channels)
Current - Output / Channel	25 mA	30 mA	14 mA	40 mA	Not Specified	Not Specified
Voltage - Supply Span (Min)	44 V	3 V	44 V	3 V	20 V	2 V
Voltage - Supply Span (Max)	44 V	30 V	44 V	32 V	36 V	40 V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Product Status	Obsolete	Obsolete	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent (Same Amplifier Type):

The LM224AN represents the closest direct equivalent to the LM248N. Both are general-purpose operational amplifiers manufactured by STMicroelectronics with identical package configuration, 4-circuit configuration, and comparable electrical performance. The LM224AN maintains the same gain bandwidth product (1.3 MHz) and operating temperature range (-40°C ~ 105°C). However, the LM224AN operates with a reduced supply voltage span (3 V to 30 V) compared to the LM248N (44 V fixed). This difference is critical for applications requiring the full 44 V supply capability. Both components are ROHS3 compliant and carry MSL 1 rating.

Active Substitute with Enhanced Performance:

The LF444ACN/NOPB (Texas Instruments) provides an active substitute with J-FET amplifier architecture. This component maintains the 14-DIP package and 4-circuit configuration with identical mechanical compatibility. The LF444ACN/NOPB offers superior input bias current performance (10 pA versus 30 nA) and higher slew rate (1 V/µs versus 0.5 V/µs). However, the output current per channel is reduced to 14 mA (versus 25 mA), and the operating temperature range is limited to 0°C ~ 70°C. The supply voltage span matches the LM248N at 44 V. This substitute is suitable for applications prioritizing low input bias current and higher slew rate performance within the specified temperature range.

Alternative General-Purpose Substitute:

The LM324NE4 (Texas Instruments, Last Time Buy status) offers general-purpose amplification with 4 circuits in 14-DIP package. This component provides higher output current capability (40 mA per channel) and operates across a 3 V to 32 V supply range. The operating temperature range is restricted to 0°C ~ 70°C. The LM324NE4 is suitable for applications not requiring extended temperature operation or the full 44 V supply capability.

High-Performance J-FET Alternatives:

The LT1058CN#PBF (Analog Devices Inc., Active status) represents a high-performance J-FET substitute with significantly enhanced specifications: 13 V/µs slew rate, 5 MHz gain bandwidth product, and 7 pA input bias current. The supply voltage range is 20 V to 36 V, which does not accommodate the full 44 V requirement of the LM248N. Operating temperature is limited to 0°C ~ 70°C. This substitute is appropriate for applications requiring superior dynamic performance and low input bias current within the specified voltage and temperature constraints.

Low-Power General-Purpose Alternative:

The LT1114CN#PBF (Analog Devices Inc., Active status) provides a low-power general-purpose option with minimal supply current (350 µA per 4 channels) and extended supply voltage range (2 V to 40 V). The gain bandwidth product is reduced to 750 kHz, and operating temperature is limited to 0°C ~ 70°C. This substitute is suitable for power-constrained applications where the reduced bandwidth is acceptable.

Selection Criteria Summary:

For applications requiring 44 V supply capability: LM248N, LM224AN (with voltage limitation), or LF444ACN/NOPB
For extended temperature operation (-40°C ~ 105°C): LM248N or LM224AN only
For active product status and long-term availability: LF444ACN/NOPB, LT1058CN#PBF, or LT1114CN#PBF
For output current requirements ≥25 mA: LM248N, LM224AN, or LM324NE4
For low input bias current applications: LF444ACN/NOPB (10 pA) or LT1058CN#PBF (7 pA)

Frequently Asked Questions (FAQ)

Q: Can the LM224AN directly replace the LM248N in all applications?

A: The LM224AN is mechanically and functionally compatible with the LM248N in terms of package, pin configuration, and circuit count. However, the LM224AN operates with a maximum supply voltage of 30 V, whereas the LM248N requires 44 V. Direct substitution is only valid for applications operating at or below 30 V supply voltage. Applications requiring the full 44 V supply capability cannot use the LM224AN as a substitute.

Q: What is the primary advantage of J-FET amplifier substitutes like the LF444ACN/NOPB?

A: J-FET amplifiers offer significantly lower input bias current (10 pA for LF444ACN/NOPB versus 30 nA for LM248N) and higher slew rate (1 V/µs versus 0.5 V/µs). These characteristics are beneficial for high-impedance input circuits and applications requiring faster signal response. The trade-off is reduced output current capability (14 mA versus 25 mA) and a narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 105°C).

Q: Is the LT1058CN#PBF suitable for all LM248N applications?

A: The LT1058CN#PBF provides superior performance in slew rate (13 V/µs) and gain bandwidth product (5 MHz) with extremely low input bias current (7 pA). However, substitution is limited by the supply voltage range (20 V to 36 V), which does not accommodate the 44 V requirement of the LM248N. Additionally, the operating temperature range is restricted to 0°C ~ 70°C. The LT1058CN#PBF is suitable only for applications operating within these voltage and temperature constraints.

Q: Why is the LM324NE4 marked as "Last Time Buy"?

A: Last Time Buy status indicates that the manufacturer has announced discontinuation of this product. Existing inventory is available for purchase, but no future production is planned. This status does not affect the component's functionality or compliance certifications. However, long-term availability cannot be guaranteed, making it a less reliable choice for new designs requiring extended product lifecycle support.

Q: Can I use the LT1114CN#PBF in a high-speed application?

A: The LT1114CN#PBF has a gain bandwidth product of 750 kHz and slew rate of 0.3 V/µs, both lower than the LM248N (1.3 MHz and 0.5 V/µs respectively). This component is not suitable for high-speed applications. The LT1114CN#PBF is optimized for low-power operation and is appropriate only for applications where bandwidth and slew rate requirements are less stringent than those of the LM248N.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed in this reference are ROHS3 compliant. The LM248N is also ROHS3 compliant. This ensures compatibility with environmental and regulatory requirements across all listed alternatives.

Q: What is the significance of the 14-DIP package specification?

A: The 14-DIP (Dual In-line Package) with 0.300" (7.62 mm) row spacing is a through-hole mounting package standard for operational amplifiers. All substitute parts maintain this identical package configuration, ensuring mechanical compatibility with existing printed circuit board layouts and socket configurations. No PCB redesign is required when substituting between parts with this package specification.

Q: Which substitute offers the best balance of performance and availability?

A: The LF444ACN/NOPB (Texas Instruments) provides an optimal balance of enhanced performance characteristics (lower input bias current and higher slew rate), active product status ensuring long-term availability, full ROHS3 compliance, and mechanical compatibility with the LM248N. The primary limitation is the restricted operating temperature range (0°C ~ 70°C) and reduced output current capability (14 mA versus 25 mA). For applications within these constraints, the LF444ACN/NOPB is the recommended substitute.

Q: Can I mix LM248N and substitute parts in the same circuit?

A: Yes, multiple different operational amplifier types can be used in the same circuit design, provided each amplifier is selected based on the specific functional requirements of its application stage. However, mixing different amplifier types (general-purpose versus J-FET) may introduce variations in input offset voltage, input bias current, and frequency response characteristics across the circuit. Circuit design and compensation techniques should account for these differences to maintain overall system performance.

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