LF411CD Equivalent & Substitute Parts Reference

Part Overview

The LF411CD is a J-FET input operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete product status, though 3100 units remain available in original inventory. The LF411CD serves applications requiring low input bias current and low input offset voltage characteristics typical of J-FET amplifier designs.

Due to obsolete product status, identifying equivalent and substitute parts ensures design continuity and supply chain reliability. Substitute parts listed below maintain functional compatibility within specified electrical and mechanical parameters while offering active product status alternatives.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	13	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	800	µV
Current - Supply	2	mA
Voltage - Supply Span (Min)	7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LF411CD are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following mandatory parameters:

Mandatory Compatibility Parameters:

Amplifier Type: J-FET
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Electrical Operating Range Parameters:

Voltage - Supply Span (Min): 7 V or greater
Voltage - Supply Span (Max): 36 V or greater
Operating Temperature: 0°C to 70°C minimum coverage

Substitute parts are classified into two categories:

Category 1: Direct Manufacturer Equivalents (Texas Instruments) Parts maintaining identical electrical specifications and active product status from the original manufacturer.

Category 2: Cross-Manufacturer Alternatives (Analog Devices Inc.) Parts from alternative manufacturers meeting or exceeding electrical specifications while maintaining package and compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Temp Range (°C)	Packaging
LF411CD	Texas Instruments	Obsolete	13	3	50	800	2	0 to 70	Tube
LF411CDR	Texas Instruments	Active	13	3	50	800	2	0 to 70	Cut Tape & Digi-Reel
ADA4000-1ARZ-R7	Analog Devices Inc.	Active	20	5	5	200	1.35	-40 to 125	Cut Tape & Digi-Reel
LT1055S8#TRPBF	Analog Devices Inc.	Active	12	4.5	30	500	2.8	0 to 70	Tape & Reel
LT1056S8#PBF	Analog Devices Inc.	Active	14	5.5	30	500	5	0 to 70	Tube
LT1793ACS8#PBF	Analog Devices Inc.	Active	3.4	4.2	3	250	4.2	0 to 70	Tube
LT1793CS8#PBF	Analog Devices Inc.	Active	3.4	4.2	4	250	4.2	0 to 70	Tube
LT1793CS8#TRPBF	Analog Devices Inc.	Active	3.4	4.2	4	250	4.2	0 to 70	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: LF411CDR

The LF411CDR is the direct equivalent of the LF411CD, manufactured by Texas Instruments with identical electrical specifications. This part maintains active product status with 24020 units in stock inventory. Selection of LF411CDR eliminates design modification requirements and ensures pin-for-pin compatibility. Packaging format differs (Cut Tape & Digi-Reel versus Tube), but electrical and mechanical specifications remain identical. This part is suitable for direct replacement in all applications currently using LF411CD.

Secondary Recommendation: ADA4000-1ARZ-R7

The ADA4000-1ARZ-R7 from Analog Devices Inc. provides enhanced electrical performance characteristics including higher slew rate (20 V/µs versus 13 V/µs), higher gain bandwidth product (5 MHz versus 3 MHz), significantly lower input bias current (5 pA versus 50 pA), and lower input offset voltage (200 µV versus 800 µV). Extended operating temperature range (-40°C to 125°C) provides broader environmental coverage. This part is suitable for applications where improved performance specifications are beneficial and design verification is feasible.

Tertiary Recommendations: LT1055S8#TRPBF, LT1056S8#PBF

These Analog Devices parts maintain electrical specifications closely aligned with LF411CD specifications. LT1055S8#TRPBF offers comparable slew rate (12 V/µs) and gain bandwidth product (4.5 MHz) with lower input bias current (30 pA). LT1056S8#PBF provides slightly higher slew rate (14 V/µs) and gain bandwidth product (5.5 MHz). Both parts maintain 0°C to 70°C operating temperature range matching the original specification. These parts are suitable for applications where minor performance variations are acceptable.

Alternative Consideration: LT1793 Series (LT1793ACS8#PBF, LT1793CS8#PBF, LT1793CS8#TRPBF)

The LT1793 series offers extremely low input bias current (3-4 pA) and low input offset voltage (250 µV), representing significant performance improvement over LF411CD. However, slew rate is substantially lower (3.4 V/µs versus 13 V/µs). These parts are suitable only for applications where low input bias current is critical and slew rate requirements are not demanding.

All recommended substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and 8-SOIC package compatibility with the original LF411CD.

Frequently Asked Questions (FAQ)

Q1: Can LF411CDR be used as a direct replacement for LF411CD?

Yes. LF411CDR is the active product equivalent manufactured by Texas Instruments with identical electrical specifications (13 V/µs slew rate, 3 MHz gain bandwidth product, 50 pA input bias current, 800 µV input offset voltage). The only difference is packaging format: LF411CDR is supplied in Cut Tape & Digi-Reel format while LF411CD is supplied in Tube format. Electrical and mechanical specifications are identical, making LF411CDR suitable for direct pin-for-pin replacement.

Q2: What are the key differences between LF411CD and ADA4000-1ARZ-R7?

The ADA4000-1ARZ-R7 provides enhanced performance: slew rate increases from 13 V/µs to 20 V/µs, gain bandwidth product increases from 3 MHz to 5 MHz, input bias current decreases from 50 pA to 5 pA, and input offset voltage decreases from 800 µV to 200 µV. Operating temperature range extends from 0-70°C to -40-125°C. Supply current decreases from 2 mA to 1.35 mA. These improvements make ADA4000-1ARZ-R7 suitable for applications requiring enhanced performance specifications.

Q3: Are all substitute parts compatible with the 8-SOIC package footprint?

Yes. All substitute parts listed maintain the 8-SOIC (0.154", 3.90mm Width) package specification. PCB footprints are mechanically compatible. Surface mount assembly processes remain unchanged. Packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel) affects supply and handling but not PCB compatibility.

Q4: Which substitute part offers the lowest input bias current?

The LT1793 series (LT1793ACS8#PBF, LT1793CS8#PBF, LT1793CS8#TRPBF) offers the lowest input bias current at 3-4 pA, compared to 50 pA for LF411CD. The ADA4000-1ARZ-R7 offers 5 pA input bias current. Selection depends on application requirements for input bias current performance versus other electrical parameters such as slew rate.

Q5: What is the impact of slew rate differences between substitute parts?

Slew rate determines the maximum rate of output voltage change. LF411CD specifies 13 V/µs. Substitute parts vary: ADA4000-1ARZ-R7 (20 V/µs), LT1056S8#PBF (14 V/µs), LT1055S8#TRPBF (12 V/µs), and LT1793 series (3.4 V/µs). Higher slew rate enables faster signal processing and reduced distortion in high-frequency applications. Lower slew rate may limit performance in applications requiring rapid output transitions.

Q6: Are all substitute parts RoHS3 compliant?

Yes. All substitute parts listed maintain ROHS3 compliance status identical to LF411CD. All parts also maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q7: Which substitute part is recommended for extended temperature range applications?

The ADA4000-1ARZ-R7 provides extended operating temperature range from -40°C to 125°C, compared to 0°C to 70°C for LF411CD and most other substitutes. This part is suitable for applications requiring operation outside the standard 0-70°C range.

Q8: What inventory availability should be considered for part selection?

Current inventory levels are: LF411CDR (24020 units), LT1793CS8#TRPBF (2240 units), ADA4000-1ARZ-R7 (2394 units), LT1055S8#TRPBF (2100 units), LT1793CS8#PBF (1488 units), LT1056S8#PBF (1386 units), and LT1793ACS8#PBF (1290 units). LF411CDR offers the highest inventory availability for immediate supply requirements.

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