LF412CDG4 Equivalent & Substitute Parts

Part Overview

The LF412CDG4 is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in 8-SOIC surface mount packaging. This component is classified as obsolete, with 771 pieces currently in stock. The LF412CDG4 serves applications requiring low input bias current and low input offset voltage characteristics typical of J-FET amplifier designs. Due to its obsolete status, equivalent substitute parts with identical or superior electrical specifications 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	13	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	500	µV
Current - Supply	4.5 (x2 Channels)	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 LF412CDG4 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Amplifier Type: J-FET or equivalent low-bias-current topology
Number of Circuits: 2 (dual-channel configuration)
Package / Case: 8-SOIC form factor
Mounting Type: Surface Mount
Voltage Supply Range: Minimum 7V to 36V maximum (or compatible subset)
Operating Temperature Range: 0°C to 70°C or extended range

Performance Parameters for Substitution:

Slew Rate: 13 V/µs or greater
Gain Bandwidth Product: 3 MHz or greater
Current - Input Bias: 50 pA or lower
Voltage - Input Offset: 500 µV or lower
Current - Supply: 4.5 mA per channel or lower

Substitute parts are grouped into two categories: direct replacements (identical base product number variants with different packaging) and functional equivalents (alternative manufacturers with comparable or superior electrical performance).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Temp Range (°C)	Product Status
LF412CDG4	Texas Instruments	J-FET	13	3	50	500	4.5	7	36	0 to 70	Obsolete
LF412CD	Texas Instruments	J-FET	13	3	50	500	4.5	7	36	0 to 70	Obsolete
LF412CDR	Texas Instruments	J-FET	13	3	50	500	4.5	7	36	0 to 70	Active
TL082BCD	Texas Instruments	J-FET	13	3	30	2000	1.4	10	30	0 to 70	Obsolete
AD712JRZ	Analog Devices Inc.	J-FET	20	4	25	300	5	9	36	0 to 70	Active
AD712JRZ-REEL	Analog Devices Inc.	J-FET	20	4	25	300	5	9	36	0 to 70	Active
AD712JRZ-REEL7	Analog Devices Inc.	J-FET	20	4	25	300	5	9	36	0 to 70	Active
AD8682ARZ-REEL7	Analog Devices Inc.	J-FET	9	3.5	6	350	0.21	9	36	-40 to 85	Active
LM833DT	STMicroelectronics	Audio	7	15	300	300	4	5	30	-40 to 105	Active
LT1352IS8#TR	Analog Devices Inc.	Voltage Feedback	200	3	20	200	0.25	5	30	-40 to 85	Active
SSM2135SZ	Analog Devices Inc.	Audio	0.9	3.5	300	200	3.7	4	36	-40 to 85	Active

Engineering Selection Recommendations

Primary Substitutes (Identical Electrical Specifications):

LF412CDR is the recommended primary substitute. This part maintains identical electrical specifications to the LF412CDG4 (13 V/µs slew rate, 3 MHz gain bandwidth product, 50 pA input bias current, 500 µV input offset voltage) while offering active product status. LF412CDR is available in higher inventory (87,900 pieces) and is supplied in Cut Tape and Digi-Reel packaging. Both parts are ROHS3 compliant and carry identical compliance certifications.

LF412CD provides an alternative from the same base product family with identical electrical performance. This part is obsolete but maintains full specification compatibility. Inventory availability is 2,384 pieces.

Secondary Substitutes (Enhanced Performance, Active Status):

AD712JRZ and AD712JRZ-REEL7 (Analog Devices Inc.) offer superior electrical performance with active product status. These parts provide improved input bias current (25 pA versus 50 pA), lower input offset voltage (300 µV versus 500 µV), and higher slew rate (20 V/µs versus 13 V/µs). The minimum supply voltage requirement increases to 9V. Both variants maintain the 8-SOIC package and are ROHS3 compliant. AD712JRZ-REEL7 offers the highest inventory availability (38,531 pieces) among active J-FET substitutes.

AD8682ARZ-REEL7 (Analog Devices Inc.) provides the lowest input bias current (6 pA) and extended operating temperature range (-40°C to 85°C). Supply current is significantly reduced (210 µA per channel versus 4.5 mA). This part is suitable for low-power applications requiring extended temperature operation. Minimum supply voltage is 9V.

Functional Alternatives (Different Amplifier Topology):

LM833DT (STMicroelectronics) is an audio amplifier with higher gain bandwidth product (15 MHz) and extended operating temperature range (-40°C to 105°C). Input bias current is higher (300 nA) and slew rate is lower (7 V/µs). This part is suitable for audio applications where higher bandwidth is beneficial. Minimum supply voltage is 5V.

LT1352IS8#TR (Analog Devices Inc.) is a voltage feedback amplifier with significantly higher slew rate (200 V/µs) and lower supply current (250 µA per channel). Input bias current is higher (20 nA). This part is suitable for high-speed applications. Minimum supply voltage is 5V.

SSM2135SZ (Analog Devices Inc.) is an audio amplifier with extended supply voltage range (4V to 36V) and extended operating temperature range (-40°C to 85°C). Slew rate is lower (0.9 V/µs). This part is suitable for audio applications requiring wide supply voltage compatibility.

Compliance and Certification:

All substitute parts listed are ROHS3 compliant, carry MSL rating of 1 (Unlimited), and are REACH unaffected. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can LF412CDR directly replace LF412CDG4 in existing designs?

A: Yes. LF412CDR is electrically identical to LF412CDG4, with identical slew rate (13 V/µs), gain bandwidth product (3 MHz), input bias current (50 pA), input offset voltage (500 µV), and supply voltage range (7V to 36V). The only difference is packaging format (Cut Tape & Digi-Reel versus tube) and product status (Active versus Obsolete). No circuit modifications are required.

Q: What are the key differences between LF412CDG4 and AD712JRZ?

A: Both are J-FET amplifiers in 8-SOIC packages with 2 circuits. AD712JRZ offers superior performance: lower input bias current (25 pA versus 50 pA), lower input offset voltage (300 µV versus 500 µV), and higher slew rate (20 V/µs versus 13 V/µs). AD712JRZ requires minimum 9V supply (versus 7V for LF412CDG4) and is manufactured by Analog Devices Inc. versus Texas Instruments. AD712JRZ has active product status.

Q: Is AD8682ARZ-REEL7 suitable as a direct replacement?

A: AD8682ARZ-REEL7 is functionally compatible but not a direct replacement. While both are J-FET amplifiers in 8-SOIC packages with 2 circuits, AD8682ARZ-REEL7 has significantly lower supply current (210 µA per channel versus 4.5 mA), lower slew rate (9 V/µs versus 13 V/µs), and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C). This part is optimized for low-power applications and requires minimum 9V supply.

Q: Can audio amplifiers like LM833DT or SSM2135SZ replace the LF412CDG4?

A: Audio amplifiers are functionally different from J-FET amplifiers. LM833DT and SSM2135SZ have higher input bias current (300 nA versus 50 pA) and different slew rate characteristics. LM833DT offers higher gain bandwidth product (15 MHz versus 3 MHz) but lower slew rate (7 V/µs). SSM2135SZ has very low slew rate (0.9 V/µs). These parts are suitable only for applications where the specific audio amplifier characteristics are required, not as general-purpose J-FET replacements.

Q: What is the difference between AD712JRZ, AD712JRZ-REEL, and AD712JRZ-REEL7?

A: All three variants have identical electrical specifications. The differences are in packaging format: AD712JRZ is supplied in Tube packaging, AD712JRZ-REEL is supplied in Cut Tape & Digi-Reel, and AD712JRZ-REEL7 is also supplied in Cut Tape & Digi-Reel. Inventory availability differs: AD712JRZ (7,752 pieces), AD712JRZ-REEL (16,400 pieces), and AD712JRZ-REEL7 (38,531 pieces). Select based on packaging requirements and inventory needs.

Q: Why is LT1352IS8#TR listed as a substitute if it has different amplifier topology?

A: LT1352IS8#TR is included as a functional alternative for applications requiring voltage feedback amplifier characteristics. It maintains the 8-SOIC package, 2-circuit configuration, and 3 MHz gain bandwidth product. However, its 200 V/µs slew rate and 250 µA supply current make it suitable only for high-speed, low-power applications. It is not a direct replacement for general-purpose J-FET amplifier applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (LF412CD, LF412CDR, TL082BCD, AD712JRZ variants, AD8682ARZ-REEL7, LM833DT, LT1352IS8#TR, and SSM2135SZ) are ROHS3 compliant with MSL rating of 1 (Unlimited) and are REACH unaffected.

Q: What is the minimum supply voltage requirement for each substitute?

A: LF412CDG4, LF412CD, and LF412CDR require 7V minimum. TL082BCD requires 10V minimum. AD712JRZ variants and AD8682ARZ-REEL7 require 9V minimum. LM833DT and LT1352IS8#TR require 5V minimum. SSM2135SZ requires 4V minimum. Verify supply voltage compatibility with your circuit design before substitution.

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