LF411CN/NOPB Equivalent & Substitute Parts

Part Overview

The LF411CN/NOPB is a J-FET input operational amplifier manufactured by Texas Instruments, housed in an 8-DIP package. This device is classified as Obsolete but remains in stock with 3,000 units available. The LF411CN/NOPB belongs to the BI-FET II™ series and is designed for applications requiring low input bias current and high input impedance characteristics typical of J-FET amplifier architectures.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new product development. Substitute parts must maintain compatibility across critical electrical parameters including slew rate, gain bandwidth product, input bias current, input offset voltage, supply voltage range, and package configuration.

Key Parameters

Parameter	LF411CN/NOPB	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	15	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	800	µV
Current - Supply	1.8	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 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 logic for the LF411CN/NOPB is based on the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET (required for input bias current and impedance characteristics)
Number of Circuits: 1 (single amplifier per package)
Package / Case: 8-DIP (0.300", 7.62mm) or compatible through-hole 8-pin DIP configuration
Voltage - Supply Span: Minimum 10 V, Maximum 36 V (operational range compatibility)
Operating Temperature: 0°C to 70°C (standard commercial grade)

Secondary Compatibility Parameters:

Slew Rate: 15 V/µs or greater (performance maintenance)
Gain Bandwidth Product: 4 MHz or greater (frequency response compatibility)
Current - Input Bias: 50 pA or lower (input stage performance)
Voltage - Input Offset: 800 µV or lower (DC accuracy)
Current - Supply: 1.8 mA or lower (power consumption)

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (8-DIP) Parts maintaining identical 8-DIP package configuration with J-FET amplifier architecture and compatible electrical specifications.

Category 2: Enhanced Performance Alternatives Parts offering improved electrical characteristics (lower input bias current, lower input offset voltage, higher slew rate) while maintaining J-FET architecture and compatible supply voltage range, though some may use alternative package configurations.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
LF411CN/NOPB	Texas Instruments	J-FET	15	4	50	800	1.8	10	36	0 to 70	8-DIP	Obsolete
LF411CP	Texas Instruments	J-FET	13	3	50	800	2	7	36	0 to 70	8-DIP	Active
AD711KNZ	Analog Devices Inc.	J-FET	20	4	15	200	2.5	9	36	0 to 70	8-DIP	Active
AD711JNZ	Analog Devices Inc.	J-FET	20	4	15	300	2.5	9	36	0 to 70	8-DIP	Active
AD711AQ	Analog Devices Inc.	J-FET	20	4	15	300	2.5	9	36	-40 to 85	8-CDIP	Active
LT1055CN8#PBF	Analog Devices Inc.	J-FET	12	4.5	30	120	2.8	10	36	0 to 70	8-DIP	Active
LT1056CN8#PBF	Analog Devices Inc.	J-FET	14	5.5	30	140	5	10	36	0 to 70	8-DIP	Active
LT1792CN8#PBF	Analog Devices Inc.	J-FET	3.4	5.6	300	200	4.2	9	40	0 to 70	8-DIP	Active
LT1792ACN8#PBF	Analog Devices Inc.	J-FET	3.4	5.6	300	200	4.2	9	40	0 to 70	8-DIP	Active
LT1792IN8#PBF	Analog Devices Inc.	J-FET	3.4	5.6	300	200	4.2	9	40	-40 to 85	8-DIP	Active
AD548KNZ	Analog Devices Inc.	General Purpose	1.8	1	30	300	0.17	9	36	0 to 70	8-DIP	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Category 1 - Direct Equivalents):

LF411CP (Texas Instruments, Active Status)

Maintains Texas Instruments BI-FET II™ architecture
Identical 8-DIP package configuration
Compatible supply voltage range (7 V to 36 V)
Equivalent input bias current (50 pA)
Equivalent input offset voltage (800 µV)
Slightly lower slew rate (13 V/µs vs. 15 V/µs) and gain bandwidth product (3 MHz vs. 4 MHz)
Active product status ensures long-term availability
ROHS3 compliant, REACH unaffected

Recommended Secondary Substitutes (Category 2 - Enhanced Performance):

AD711KNZ (Analog Devices Inc., Active Status)

J-FET amplifier architecture maintained
8-DIP package configuration
Superior slew rate (20 V/µs vs. 15 V/µs)
Equivalent gain bandwidth product (4 MHz)
Significantly lower input bias current (15 pA vs. 50 pA)
Lower input offset voltage (200 µV vs. 800 µV)
Compatible supply voltage range (9 V to 36 V)
Active product status with 1,271 units in stock
ROHS3 compliant, REACH unaffected

LT1055CN8#PBF (Analog Devices Inc., Active Status)

J-FET amplifier architecture
8-DIP package configuration
Higher gain bandwidth product (4.5 MHz vs. 4 MHz)
Lower input bias current (30 pA vs. 50 pA)
Significantly lower input offset voltage (120 µV vs. 800 µV)
Compatible supply voltage range (10 V to 36 V)
Active product status with 1,500 units in stock
ROHS3 compliant, REACH unaffected

Not Recommended:

AD548KNZ - General Purpose amplifier type (not J-FET), significantly lower slew rate (1.8 V/µs), lower gain bandwidth product (1 MHz), and substantially lower supply current (170 µA). Electrical characteristics deviate significantly from J-FET requirements.

LT1792 Series (LT1792CN8#PBF, LT1792ACN8#PBF, LT1792IN8#PBF) - Significantly lower slew rate (3.4 V/µs vs. 15 V/µs), higher input bias current (300 pA vs. 50 pA), and higher supply current (4.2 mA vs. 1.8 mA). These parts are suitable only for applications where lower slew rate is acceptable.

Frequently Asked Questions (FAQ)

Q1: Can LF411CP be used as a direct replacement for LF411CN/NOPB?

A: LF411CP is a direct package equivalent with identical 8-DIP configuration and J-FET architecture. Both parts share the same base product number (LF411) and are manufactured by Texas Instruments. The primary difference is that LF411CP has slightly lower slew rate (13 V/µs vs. 15 V/µs) and gain bandwidth product (3 MHz vs. 4 MHz). LF411CP is suitable for applications where these minor performance reductions are acceptable. LF411CP is Active status, ensuring continued availability.

Q2: What are the key differences between AD711KNZ and LF411CN/NOPB?

A: Both are J-FET operational amplifiers in 8-DIP packages with compatible supply voltage ranges. AD711KNZ offers superior performance: higher slew rate (20 V/µs vs. 15 V/µs), lower input bias current (15 pA vs. 50 pA), and lower input offset voltage (200 µV vs. 800 µV). The gain bandwidth product is equivalent (4 MHz). AD711KNZ is manufactured by Analog Devices Inc. and has Active status. The lower input bias current makes AD711KNZ preferable for high-impedance input applications.

Q3: Why is AD548KNZ not recommended as a substitute?

A: AD548KNZ is a General Purpose amplifier, not a J-FET amplifier. It has significantly different electrical characteristics: slew rate of 1.8 V/µs (vs. 15 V/µs), gain bandwidth product of 1 MHz (vs. 4 MHz), and supply current of 170 µA (vs. 1.8 mA). These differences make it unsuitable for applications designed around the LF411CN/NOPB's J-FET characteristics and performance envelope.

Q4: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, matching the compliance status of the LF411CN/NOPB.

Q5: What is the difference between 8-DIP and 8-CDIP packages?

A: 8-DIP (Dual In-line Package) and 8-CDIP (Ceramic Dual In-line Package) are both through-hole packages with 0.300" (7.62mm) spacing. The primary difference is material: 8-DIP typically uses plastic, while 8-CDIP uses ceramic. Both are mechanically compatible with standard DIP sockets. AD711AQ uses 8-CDIP packaging but is otherwise electrically equivalent to AD711KNZ and AD711JNZ.

Q6: Which substitute offers the best low-noise performance?

A: LT1055CN8#PBF offers the lowest input offset voltage (120 µV vs. 800 µV for the original part) and low input bias current (30 pA), making it suitable for precision low-noise applications. It maintains J-FET architecture and 8-DIP packaging with compatible supply voltage range (10 V to 36 V).

Q7: Can I use LT1792 series parts as substitutes?

A: LT1792 series parts (LT1792CN8#PBF, LT1792ACN8#PBF, LT1792IN8#PBF) are J-FET amplifiers in 8-DIP packages with compatible supply voltage ranges. However, they have significantly lower slew rate (3.4 V/µs vs. 15 V/µs) and higher input bias current (300 pA vs. 50 pA). These parts are suitable only for applications where lower slew rate is acceptable and input bias current is not critical.

Q8: What is the operating temperature range difference between substitutes?

A: LF411CN/NOPB operates from 0°C to 70°C (commercial grade). Most substitutes maintain this range. However, AD711AQ and LT1792IN8#PBF extend the range to -40°C to 85°C (industrial grade), providing wider temperature operation if required by the application.

Q9: Are there inventory considerations for substitute selection?

A: Current inventory levels are: LF411CN/NOPB (3,000 units), LF411CP (1,800 units), AD711KNZ (1,271 units), AD711JNZ (2,903 units), LT1055CN8#PBF (1,500 units), LT1056CN8#PBF (1,320 units), LT1792CN8#PBF (1,900 units), and LT1792ACN8#PBF (2,270 units). All substitutes have sufficient inventory for production use.

Q10: What is the primary reason to substitute the LF411CN/NOPB?

A: The LF411CN/NOPB is classified as Obsolete. Substitution is necessary to ensure long-term design continuity and supply chain reliability. Active-status alternatives such as LF411CP, AD711KNZ, and LT1055CN8#PBF provide equivalent or enhanced functionality with guaranteed future availability.

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