LF412ACN Equivalent & Substitute Parts

Part Overview

The LF412ACN is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-circuit (2-channel) device in an 8-DIP package. This part is classified as obsolete, though 10,400 units remain in stock as new original inventory. The LF412ACN operates across a wide supply voltage range (10V to 44V) and is designed for applications requiring low input bias current and moderate bandwidth performance. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	15	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	500	µV
Current - Supply	3.6 (x2 Channels)	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)	—
Mounting Type	Through Hole	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LF412ACN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Dual-channel (2 circuits)
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature Range: Minimum 0°C to 70°C coverage

Secondary Compatibility Parameters:

Slew Rate: 15 V/µs (baseline; higher rates acceptable)
Gain Bandwidth Product: 4 MHz (baseline; higher bandwidth acceptable)
Current - Input Bias: 50 pA (baseline; lower values acceptable)
Voltage - Input Offset: 500 µV (baseline; lower values acceptable)
Current - Supply: 3.6 mA per channel (baseline; lower consumption acceptable)
Voltage - Supply Span: Minimum 10V to Maximum 44V (substitute must support this range or wider)

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Identical Electrical Performance)

LF412ACN/NOPB: Texas Instruments direct equivalent with active product status and RoHS3 compliance

Category 2: Functional Alternatives (Enhanced or Comparable Performance)

AD648JNZ, AD648KNZ: Lower input bias current and supply current; reduced bandwidth
AD712JNZ, AD712KNZ: Higher slew rate and bandwidth; comparable input bias current
AD746JNZ: Significantly higher slew rate and bandwidth; higher input bias current
LT1057ACN8#PBF, LT1057CN8#PBF: Lower input bias current and offset voltage; reduced supply current; restricted supply voltage range (20V minimum)
LT1113ACN8#PBF, LT1113CN8#PBF: Extended operating temperature range; higher supply current; wider supply voltage range

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	RoHS Status
LF412ACN	Texas Instruments	Obsolete	15	4	50	500	3.6	10	44	0 to 70	Non-compliant
LF412ACN/NOPB	Texas Instruments	Active	15	4	50	500	3.6	10	44	0 to 70	RoHS3 Compliant
AD648JNZ	Analog Devices Inc.	Active	1.8	1	5	750	0.34	9	36	0 to 70	RoHS3 Compliant
AD648KNZ	Analog Devices Inc.	Active	1.8	1	3	300	0.34	9	36	0 to 70	RoHS3 Compliant
AD712JNZ	Analog Devices Inc.	Active	20	4	25	300	5	9	36	0 to 70	RoHS3 Compliant
AD712KNZ	Analog Devices Inc.	Active	20	4	25	300	5	9	36	0 to 70	RoHS3 Compliant
AD746JNZ	Analog Devices Inc.	Active	75	13	110	300	7	9	36	0 to 70	RoHS3 Compliant
LT1057ACN8#PBF	Analog Devices Inc.	Active	14	5	5	150	1.6	20	36	0 to 70	RoHS3 Compliant
LT1057CN8#PBF	Analog Devices Inc.	Active	13	5	7	200	1.7	20	36	0 to 70	RoHS3 Compliant
LT1113ACN8#PBF	Analog Devices Inc.	Active	3.9	5.6	300	450	5.3	9	40	-40 to 85	RoHS3 Compliant
LT1113CN8#PBF	Analog Devices Inc.	Active	3.9	5.6	300	550	5.3	9	40	-40 to 85	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

LF412ACN/NOPB is the primary choice for direct substitution. This part maintains all electrical parameters of the original LF412ACN while offering active product status and RoHS3 compliance. The NOPB designation indicates lead-free, halogen-free packaging suitable for modern manufacturing environments. With 58,746 units in stock, supply continuity is assured.

For New Designs Requiring RoHS Compliance:

When RoHS3 compliance is mandatory, LF412ACN/NOPB is the only direct equivalent. All other substitute parts listed are RoHS3 compliant and available from active product lines.

For Applications Tolerating Performance Variations:

AD712JNZ / AD712KNZ: Select when higher slew rate (20 V/µs vs. 15 V/µs) and lower input bias current (25 pA vs. 50 pA) are beneficial. Supply voltage range is reduced (9V to 36V). Both parts are RoHS3 compliant and actively manufactured.
AD746JNZ: Select only when significantly higher bandwidth (13 MHz vs. 4 MHz) and slew rate (75 V/µs vs. 15 V/µs) are required. Input bias current increases to 110 pA. Supply voltage range is reduced (9V to 36V). RoHS3 compliant.
LT1057ACN8#PBF / LT1057CN8#PBF: Select when ultra-low input bias current (5-7 pA vs. 50 pA) and minimal supply current (1.6-1.7 mA vs. 3.6 mA) are critical. Minimum supply voltage increases to 20V, restricting use in lower-voltage applications. RoHS3 compliant.
LT1113ACN8#PBF / LT1113CN8#PBF: Select when extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C) is required. Supply voltage range is wider (9V to 40V). Slew rate is significantly reduced (3.9 V/µs). RoHS3 compliant.

For Supply Chain Continuity:

All substitute parts listed are from active product lines with confirmed inventory. LF412ACN/NOPB offers the highest inventory level (58,746 units) and is the recommended choice for long-term availability.

Frequently Asked Questions (FAQ)

Q1: Can LF412ACN/NOPB be used as a direct replacement for LF412ACN?

A: Yes. LF412ACN/NOPB is electrically identical to LF412ACN across all specified parameters: slew rate (15 V/µs), gain bandwidth product (4 MHz), input bias current (50 pA), input offset voltage (500 µV), supply current (3.6 mA per channel), and supply voltage range (10V to 44V). The primary difference is product status (active vs. obsolete) and RoHS compliance (RoHS3 vs. non-compliant). Both use identical 8-DIP through-hole packaging.

Q2: What is the difference between the LF412ACN and AD712JNZ?

A: Both are dual J-FET operational amplifiers in 8-DIP packages, but with different performance characteristics. AD712JNZ offers higher slew rate (20 V/µs vs. 15 V/µs), lower input bias current (25 pA vs. 50 pA), and lower input offset voltage (300 µV vs. 500 µV). However, AD712JNZ has a reduced maximum supply voltage (36V vs. 44V) and higher supply current (5 mA vs. 3.6 mA). AD712JNZ is RoHS3 compliant and actively manufactured.

Q3: Why would I choose AD648KNZ over LF412ACN?

A: AD648KNZ is selected for applications requiring extremely low input bias current (3 pA vs. 50 pA) and minimal supply current (0.34 mA vs. 3.6 mA). These characteristics are critical in high-impedance signal conditioning and precision measurement circuits. Trade-offs include significantly reduced bandwidth (1 MHz vs. 4 MHz), lower slew rate (1.8 V/µs vs. 15 V/µs), and reduced maximum supply voltage (36V vs. 44V). AD648KNZ is RoHS3 compliant and actively manufactured.

Q4: Is LT1057ACN8#PBF compatible with all LF412ACN applications?

A: LT1057ACN8#PBF is mechanically and functionally compatible (dual J-FET, 8-DIP package) but with electrical restrictions. The minimum supply voltage is 20V, making it unsuitable for applications operating below 20V. The LF412ACN operates from 10V minimum. LT1057ACN8#PBF offers superior input bias current (5 pA vs. 50 pA) and lower supply current (1.6 mA vs. 3.6 mA), making it ideal for low-power, high-impedance applications within the 20V to 36V supply range.

Q5: Can I use LT1113ACN8#PBF in place of LF412ACN for extended temperature operation?

A: LT1113ACN8#PBF extends the operating temperature range to -40°C to 85°C (vs. 0°C to 70°C for LF412ACN) and supports a wider supply voltage range (9V to 40V vs. 10V to 44V). However, slew rate is significantly reduced (3.9 V/µs vs. 15 V/µs), and input bias current is higher (300 pA vs. 50 pA). Use LT1113ACN8#PBF only when extended temperature range is essential and reduced slew rate is acceptable. Both are 8-DIP through-hole packages and RoHS3 compliant.

Q6: What does the NOPB designation mean in LF412ACN/NOPB?

A: NOPB stands for "No Plumbum" (no lead). This designation indicates lead-free, halogen-free packaging compliant with RoHS3 regulations. The NOPB variant is suitable for modern manufacturing environments requiring environmental compliance. Electrical performance is identical to the original LF412ACN.

Q7: Are all substitute parts available in 8-DIP through-hole packaging?

A: Yes. All substitute parts listed (LF412ACN/NOPB, AD648JNZ, AD648KNZ, AD712JNZ, AD712KNZ, AD746JNZ, LT1057ACN8#PBF, LT1057CN8#PBF, LT1113ACN8#PBF, LT1113CN8#PBF) are supplied in 8-DIP (0.300", 7.62mm) through-hole packages, ensuring mechanical compatibility with existing PCB designs.

Q8: Which substitute part offers the best supply chain availability?

A: LF412ACN/NOPB has the highest confirmed inventory at 58,746 units in stock as new original parts. This ensures long-term supply continuity for production and repair applications. All other substitute parts have confirmed active status and available inventory ranging from 839 to 4,400 units.

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