LF442CN/NOPB Equivalent & Substitute Parts

Part Overview

The LF442CN/NOPB is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-DIP package. This component is classified as obsolete, indicating that Texas Instruments has discontinued production. The LF442CN/NOPB operates across a supply voltage range of 10V to 30V with a slew rate of 1V/µs and a gain bandwidth product of 1 MHz. Due to its obsolete status, equivalent substitute parts are necessary for ongoing design support, maintenance, and new production applications requiring compatible J-FET amplifier functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	LF442CN/NOPB
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Amplifier Type	J-FET
Number of Circuits	2
Slew Rate	1 V/µs
Gain Bandwidth Product	1 MHz
Current - Input Bias	10 pA
Voltage - Input Offset	1 mV
Current - Supply	400 µA (x2 Channels)
Current - Output / Channel	6.8 mA
Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LF442CN/NOPB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Amplifier Type: J-FET input configuration
Number of Circuits: Dual-channel (2 circuits)
Package Type: 8-DIP (0.300", 7.62mm) through-hole mounting
Voltage Supply Range: Minimum 10V to Maximum 30V overlap required
Operating Temperature Range: Must support 0°C to 70°C minimum

Performance Parameters for Functional Equivalence:

Slew Rate: 1 V/µs (baseline specification)
Gain Bandwidth Product: 1 MHz (baseline specification)
Current - Input Bias: 10 pA (baseline specification)
Voltage - Input Offset: 1 mV (baseline specification)

Substitute parts are grouped based on whether they maintain J-FET amplifier architecture, dual-channel configuration, and 8-DIP package compatibility. Parts meeting these core requirements are classified as direct substitutes. Parts with enhanced performance characteristics (higher slew rate, lower input bias current, extended temperature range) are listed as active-status alternatives suitable for replacement in new designs.

Parameter Comparison

Parameter	LF442CN/NOPB	LT1457ACN8#PBF	LT1457CN8#PBF	LT1464CN8#PBF	TL032CP
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET
Number of Circuits	2	2	2	2	2
Slew Rate	1 V/µs	4 V/µs	4 V/µs	0.9 V/µs	5.1 V/µs
Gain Bandwidth Product	1 MHz	1.7 MHz	1.7 MHz	1 MHz	1.1 MHz
Current - Input Bias	10 pA	5 pA	7 pA	0.5 pA	2 pA
Voltage - Input Offset	1 mV	150 µV	200 µV	600 µV	570 µV
Current - Supply	400 µA (x2)	1.8 mA (x2)	1.8 mA (x2)	145 µA (x2)	422 µA (x2)
Current - Output / Channel	6.8 mA	—	—	—	40 mA
Voltage - Supply Span (Min)	10 V	9 V	9 V	10 V	10 V
Voltage - Supply Span (Max)	30 V	36 V	36 V	30 V	30 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LT1457ACN8#PBF (Analog Devices Inc.)

This part is an active-status J-FET dual-channel amplifier in 8-DIP package. It provides enhanced performance with 4 V/µs slew rate and 1.7 MHz gain bandwidth product compared to the LF442CN/NOPB baseline. The extended operating temperature range (-40°C to 85°C) and expanded supply voltage range (9V to 36V) support broader application requirements. ROHS3 compliance and active manufacturing status ensure long-term availability. Supply current is elevated at 1.8 mA per channel relative to the original specification.

LT1457CN8#PBF (Analog Devices Inc.)

This part shares identical electrical performance characteristics with the LT1457ACN8#PBF variant, with marginally higher input bias current (7 pA versus 5 pA). Active product status and ROHS3 compliance are confirmed. Inventory availability is substantial at 2196 pieces. This part is suitable for direct replacement in applications where the extended temperature and supply voltage ranges are beneficial.

LT1464CN8#PBF (Analog Devices Inc.)

This part maintains J-FET architecture and dual-channel configuration in 8-DIP package with supply voltage range matching the original (10V to 30V). The LT1464CN8#PBF features exceptionally low input bias current (0.5 pA) and reduced supply current (145 µA per channel), making it suitable for low-power applications. Slew rate (0.9 V/µs) and gain bandwidth product (1 MHz) align closely with the LF442CN/NOPB baseline. Active status and ROHS3 compliance are confirmed. Extended operating temperature range (-40°C to 85°C) provides design flexibility.

TL032CP (Texas Instruments)

This part is a J-FET dual-channel amplifier in 8-DIP package manufactured by the original supplier (Texas Instruments). It maintains supply voltage range compatibility (10V to 30V) and operating temperature range (0°C to 70°C) with the LF442CN/NOPB. Enhanced slew rate (5.1 V/µs) and higher output current capability (40 mA per channel) are provided. Active product status and ROHS3 compliance are confirmed. This part is recommended for applications requiring Texas Instruments sourcing continuity.

Frequently Asked Questions (FAQ)

Q: Can the LF442CN/NOPB be directly replaced with any of these substitute parts?

A: All listed substitute parts maintain J-FET amplifier architecture, dual-channel configuration, and 8-DIP package compatibility. Direct pin-for-pin replacement is mechanically and electrically feasible. However, performance characteristics vary. Applications sensitive to slew rate, input bias current, or supply current should verify compatibility with specific substitute parameters before implementation.

Q: What is the primary reason for seeking substitutes for the LF442CN/NOPB?

A: The LF442CN/NOPB is classified as obsolete, meaning Texas Instruments has discontinued production. Substitute parts with active manufacturing status ensure continued availability for maintenance, repair, and new production applications.

Q: Which substitute part most closely matches the original LF442CN/NOPB performance?

A: The LT1464CN8#PBF provides the closest alignment to baseline specifications, with slew rate (0.9 V/µs) and gain bandwidth product (1 MHz) nearly identical to the original. Supply voltage range (10V to 30V) also matches exactly. The primary difference is significantly lower input bias current (0.5 pA versus 10 pA) and reduced supply current consumption.

Q: Are there temperature range limitations when substituting?

A: The LF442CN/NOPB operates from 0°C to 70°C. The LT1457ACN8#PBF, LT1457CN8#PBF, and LT1464CN8#PBF extend this range to -40°C to 85°C, which is advantageous for broader environmental applications. The TL032CP maintains the original 0°C to 70°C range. Applications operating within the original temperature window can use any substitute without thermal derating concerns.

Q: What is the impact of different supply current specifications on circuit design?

A: The LF442CN/NOPB draws 400 µA per channel (800 µA total for dual channels). The LT1457 variants draw 1.8 mA per channel (3.6 mA total), representing a 4.5× increase in supply current consumption. The LT1464CN8#PBF draws only 145 µA per channel (290 µA total), reducing consumption by 64%. Power supply design and thermal management must account for these differences. Low-power applications should prioritize the LT1464CN8#PBF.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant, matching the compliance status of the original LF442CN/NOPB. This ensures compatibility with modern procurement and environmental regulations.

Q: Can the MUSES8820D be used as a substitute?

A: The MUSES8820D is classified as an audio amplifier rather than a J-FET operational amplifier. While it shares 8-DIP package configuration and dual-channel architecture, its amplifier type (audio) differs from the J-FET specification of the LF442CN/NOPB. The MUSES8820D exhibits significantly higher gain bandwidth product (11 MHz) and input bias current (100 nA), making it unsuitable for direct substitution in applications requiring J-FET input characteristics.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts are configured in 8-DIP (0.300", 7.62mm) through-hole packages, matching the original LF442CN/NOPB footprint. PCB layout modifications are not required for mechanical compatibility. Pin assignments are identical across all J-FET dual-channel variants listed.

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