LF411ACN Equivalent & Substitute Parts

Part Overview

The LF411ACN is a J-FET input operational amplifier manufactured by Texas Instruments, housed in an 8-DIP package. This device is classified as obsolete and operates within a supply voltage range of 10V to 44V with a slew rate of 15V/µs and gain bandwidth product of 4 MHz. The LF411ACN belongs to the BI-FET II™ series and is designed for applications requiring low input bias current and precision amplification.

Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs, production continuity, and long-term component availability. Active alternatives maintain functional compatibility while offering improved specifications and compliance with current industry standards.

Key Parameters

Parameter	LF411ACN	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	300	µV
Current - Supply	1.8	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	44	V
Operating Temperature	0 to 70	°C
Package / Case	8-DIP (0.300", 7.62mm)	—
Product Status	Obsolete	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LF411ACN is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture for low input bias current performance
Number of Circuits: Single operational amplifier configuration
Package / Case: 8-DIP (0.300", 7.62mm) for mechanical and electrical compatibility
Operating Temperature Range: 0°C to 70°C commercial grade operation
Voltage - Supply Span: Minimum 9V to 10V and maximum 36V to 44V overlap for power supply compatibility
Mounting Type: Through Hole for PCB integration

Secondary Compatibility Parameters:

Slew Rate: 15V/µs or higher maintains or improves transient response
Gain Bandwidth Product: 4 MHz or higher preserves frequency response characteristics
Current - Input Bias: 50 pA or lower maintains input impedance performance
Voltage - Input Offset: 300 µV or lower ensures precision amplification

Substitute parts are grouped into two categories:

Category 1 - J-FET Amplifiers (Primary Substitutes): AD711JNZ, AD711KNZ, LT1792ACN8#PBF, LT1792CN8#PBF, LT1792IN8#PBF, LT1793ACN8#PBF, LT1793AIN8#PBF, LT1793CN8#PBF. These maintain J-FET input architecture and are direct functional replacements.

Category 2 - General Purpose Amplifier (Secondary Substitute): AD548KNZ. This part differs in amplifier type (General Purpose vs. J-FET) but shares package, pin configuration, and basic operational parameters.

Parameter Comparison

Parameter	LF411ACN	AD548KNZ	AD711JNZ	AD711KNZ	LT1792ACN8#PBF	LT1792CN8#PBF	LT1792IN8#PBF	LT1793ACN8#PBF	LT1793AIN8#PBF	LT1793CN8#PBF	Unit
Amplifier Type	J-FET	General Purpose	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	—
Number of Circuits	1	1	1	1	1	1	1	1	1	1	—
Slew Rate	15	1.8	20	20	3.4	3.4	3.4	3.4	3.4	3.4	V/µs
Gain Bandwidth Product	4	1	4	4	5.6	5.6	5.6	4.2	4.2	4.2	MHz
Current - Input Bias	50	30	15	15	300	300	300	3	3	4	pA
Voltage - Input Offset	300	300	300	200	200	200	200	250	250	250	µV
Current - Supply	1.8	0.17	2.5	2.5	4.2	4.2	4.2	4.2	4.2	4.2	mA
Voltage - Supply Span (Min)	10	9	9	9	9	9	9	9	9	9	V
Voltage - Supply Span (Max)	44	36	36	36	40	40	40	40	40	40	V
Operating Temperature	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85	0 to 70	-40 to 85	0 to 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)	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	Active	Active	Active	Active	Active	—
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

For Direct J-FET Replacement (Recommended Primary Path):

The AD711JNZ and AD711KNZ from Analog Devices are the most direct functional equivalents. Both maintain J-FET input architecture, single-circuit configuration, and 8-DIP packaging. AD711JNZ provides 4 MHz gain bandwidth product matching the LF411ACN, while AD711KNZ offers improved input offset voltage specification (200 µV vs. 300 µV). Both are Active products with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

For Enhanced Performance (J-FET with Improved Specifications):

The LT1793 series (LT1793ACN8#PBF, LT1793AIN8#PBF, LT1793CN8#PBF) offers superior input bias current performance (3 to 4 pA vs. 50 pA) while maintaining J-FET architecture and 8-DIP packaging. These parts are Active with ROHS3 compliance. LT1793AIN8#PBF extends operating temperature to -40°C to 85°C for industrial applications.

The LT1792 series (LT1792ACN8#PBF, LT1792CN8#PBF, LT1792IN8#PBF) provides higher gain bandwidth product (5.6 MHz vs. 4 MHz) with J-FET input architecture. LT1792IN8#PBF supports extended temperature range (-40°C to 85°C).

For Low-Power Applications (Secondary Path):

The AD548KNZ operates with significantly lower supply current (170 µA vs. 1.8 mA) and is suitable for battery-powered or low-power designs. However, this part uses General Purpose amplifier architecture rather than J-FET input, resulting in higher input bias current (30 pA vs. 50 pA is comparable but represents different technology). This substitution is valid only when low power consumption is prioritized over J-FET input characteristics.

Compliance and Availability:

All substitute parts are Active products with ROHS3 compliance, ensuring regulatory adherence and production continuity. The LF411ACN's obsolete status and RoHS non-compliance make transition to active alternatives necessary for new designs and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can AD711JNZ directly replace LF411ACN in existing designs?

A: Yes. AD711JNZ maintains identical J-FET amplifier type, single-circuit configuration, and 8-DIP package. Pin configuration is compatible. Operating temperature range (0°C to 70°C) matches. Supply voltage range (9V to 36V) overlaps with LF411ACN (10V to 44V). Slew rate (20V/µs) exceeds LF411ACN (15V/µs), and gain bandwidth product (4 MHz) is identical. No circuit modifications are required.

Q: What is the difference between AD711JNZ and AD711KNZ?

A: Both parts are J-FET amplifiers in 8-DIP packages with identical slew rate (20V/µs) and gain bandwidth product (4 MHz). The primary difference is input offset voltage: AD711JNZ specifies 300 µV (matching LF411ACN), while AD711KNZ specifies 200 µV (improved precision). Selection depends on offset voltage tolerance requirements in the application.

Q: Why do LT1793 parts have lower input bias current than LF411ACN?

A: LT1793 series specifies input bias current of 3 to 4 pA compared to LF411ACN's 50 pA. This represents improved J-FET input stage design in the LT1793 architecture, resulting in lower input current and higher input impedance. This is a performance enhancement, not a compatibility issue.

Q: Can I use AD548KNZ as a substitute for LF411ACN?

A: AD548KNZ is mechanically and electrically compatible (8-DIP package, overlapping supply voltage range, matching operating temperature). However, AD548KNZ uses General Purpose amplifier architecture rather than J-FET input. Input bias current is 30 pA (lower than LF411ACN's 50 pA), but this reflects different input stage technology. Substitution is valid only if the application does not require J-FET input characteristics. Slew rate (1.8V/µs) is significantly lower, which may impact transient response in high-speed applications.

Q: What is the impact of different supply voltage ranges?

A: LF411ACN operates from 10V to 44V. Substitute parts operate from 9V to 36V (AD548KNZ, AD711JNZ, AD711KNZ) or 9V to 40V (LT1792 and LT1793 series). If the application requires operation above 40V, only LF411ACN supports this range. For standard applications operating below 36V, all substitutes are compatible.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. LF411ACN is RoHS non-compliant. Transition to substitute parts ensures compliance with current environmental and regulatory standards.

Q: Which substitute offers the best input bias current performance?

A: LT1793 series offers the lowest input bias current at 3 to 4 pA, compared to LF411ACN's 50 pA. This represents a 12-fold improvement in input current performance, resulting in higher input impedance and reduced input offset current drift.

Q: Can I use LT1792IN8#PBF in industrial temperature applications?

A: Yes. LT1792IN8#PBF operates from -40°C to 85°C, extending beyond the commercial grade 0°C to 70°C range of LF411ACN. This part is suitable for industrial and automotive applications requiring extended temperature operation. Electrical specifications (slew rate, gain bandwidth product, input bias current) remain consistent across the temperature range.

Q: What is the inventory status of substitute parts?

A: All substitute parts are in active production with current inventory: AD548KNZ (1611 pcs), AD711JNZ (2903 pcs), AD711KNZ (1271 pcs), LT1792ACN8#PBF (2270 pcs), LT1792CN8#PBF (1900 pcs), LT1792IN8#PBF (697 pcs), LT1793ACN8#PBF (873 pcs), LT1793AIN8#PBF (1160 pcs), LT1793CN8#PBF (2095 pcs). LF411ACN remains available with 4339 pcs in stock but is classified as obsolete.

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