LF412CDRG4 Equivalent & Substitute Parts

Part Overview

The LF412CDRG4 is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The LF412CDRG4 is characterized by low input bias current (50 pA), low input offset voltage (500 µV), and moderate slew rate (13 V/µs), making it suitable for precision analog signal conditioning applications requiring high input impedance.

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

Substitution of the LF412CDRG4 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture
Number of Circuits: Dual-channel (2 circuits)
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 7 V to maximum 36 V (or compatible subset)
Operating Temperature: 0°C to 70°C (or extended range)

Secondary Compatibility Parameters:

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

Substitute parts are grouped into two categories:

Category A - Direct J-FET Substitutes (Highest Compatibility): Parts maintaining J-FET input topology with identical or superior electrical performance within the specified supply and temperature ranges.

Category B - Functional Alternatives (Extended Compatibility): Parts with different amplifier topologies (Audio, Voltage Feedback) that meet the 8-SOIC package requirement and supply voltage specifications but may require application-level verification due to different input characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LF412CDRG4	Texas Instruments	J-FET	13	3	50	500	7	36	0 to 70	Obsolete
LF412CDR	Texas Instruments	J-FET	13	3	50	500	7	36	0 to 70	Active
TL082BCD	Texas Instruments	J-FET	13	3	30	2000	10	30	0 to 70	Obsolete
AD712JRZ	Analog Devices Inc.	J-FET	20	4	25	300	9	36	0 to 70	Active
AD712JRZ-REEL	Analog Devices Inc.	J-FET	20	4	25	300	9	36	0 to 70	Active
AD712JRZ-REEL7	Analog Devices Inc.	J-FET	20	4	25	300	9	36	0 to 70	Active
LM833DT	STMicroelectronics	Audio	7	15	300	300	5	30	-40 to 105	Active
LT1169CS8#PBF	Analog Devices Inc.	J-FET	4.2	5.3	4	600	9	40	0 to 70	Active
LT1169CS8#TRPBF	Analog Devices Inc.	J-FET	4.2	5.3	4	600	9	40	0 to 70	Active
LT1352IS8#TR	Analog Devices Inc.	Voltage Feedback	200	3	20	200	5	30	-40 to 85	Active
SSM2135SZ	Analog Devices Inc.	Audio	0.9	3.5	300	200	4	36	-40 to 85	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Substitutes (Highest Compatibility):

LF412CDR (Texas Instruments, Active Status) This part is the active production equivalent of the LF412CDRG4. It maintains identical electrical specifications (13 V/µs slew rate, 3 MHz GBW, 50 pA input bias, 500 µV input offset) and supply voltage range (7 V to 36 V). The only difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. Digi-Reel). This is the primary recommended substitute for direct replacement in new designs and legacy system updates. RoHS3 compliant, MSL 1.

AD712JRZ / AD712JRZ-REEL / AD712JRZ-REEL7 (Analog Devices Inc., Active Status) These variants represent the same base product (AD712) in different packaging formats. All three maintain J-FET input architecture with superior electrical performance: 20 V/µs slew rate (vs. 13 V/µs), 4 MHz GBW (vs. 3 MHz), 25 pA input bias (vs. 50 pA), and 300 µV input offset (vs. 500 µV). Supply voltage range is 9 V to 36 V, which is compatible with the LF412CDRG4 for applications not requiring the 7 V minimum. Operating temperature matches (0°C to 70°C). RoHS3 compliant, MSL 1. Selection among the three variants depends on packaging requirements: AD712JRZ (Tube), AD712JRZ-REEL (Cut Tape & Digi-Reel), AD712JRZ-REEL7 (Cut Tape & Digi-Reel).

Tier 2 - Conditional Substitutes (Application-Dependent):

LT1169CS8#PBF / LT1169CS8#TRPBF (Analog Devices Inc., Active Status, LT® Series) These J-FET input parts offer exceptional input bias current (4 pA, significantly lower than 50 pA) and extended supply voltage range (9 V to 40 V). However, slew rate is reduced to 4.2 V/µs (vs. 13 V/µs), which may limit performance in high-speed signal conditioning applications. GBW is 5.3 MHz (vs. 3 MHz). Input offset voltage is 600 µV (vs. 500 µV). Suitable for applications prioritizing ultra-low input bias current over slew rate performance. RoHS3 compliant, MSL 1.

Tier 3 - Functional Alternatives (Topology Change):

LM833DT (STMicroelectronics, Active Status) Audio amplifier topology with 2 circuits in 8-SOIC package. Slew rate is 7 V/µs (lower than 13 V/µs), but GBW is 15 MHz (higher than 3 MHz). Input bias current is 300 nA (significantly higher than 50 pA), making this unsuitable for high-impedance signal sources. Supply range is 5 V to 30 V. Extended operating temperature (-40°C to 105°C). Suitable only for audio-frequency applications where input impedance is not critical. RoHS3 compliant, MSL 1.

SSM2135SZ (Analog Devices Inc., Active Status) Audio amplifier topology with 2 circuits in 8-SOIC package. Slew rate is 0.9 V/µs (significantly lower than 13 V/µs), limiting bandwidth performance. GBW is 3.5 MHz. Input bias current is 300 nA (much higher than 50 pA). Supply range is 4 V to 36 V. Extended operating temperature (-40°C to 85°C). Suitable only for low-frequency audio applications. RoHS3 compliant, MSL 1.

LT1352IS8#TR (Analog Devices Inc., Active Status, LT® Series) Voltage Feedback amplifier topology with 2 circuits in 8-SOIC package. Exceptional slew rate of 200 V/µs and low input bias current (20 nA). However, supply range is 5 V to 30 V (does not support 7 V minimum of LF412CDRG4). Operating temperature is -40°C to 85°C. Topology change from J-FET to Voltage Feedback requires application verification. RoHS3 compliant, MSL 1.

TL082BCD (Texas Instruments, Obsolete Status) J-FET input dual-channel amplifier in 8-SOIC package. Slew rate and GBW match the LF412CDRG4 (13 V/µs, 3 MHz). However, input bias current is 30 pA (better than 50 pA) but input offset voltage is 2 mV (significantly worse than 500 µV). Supply range is 10 V to 30 V (does not support 7 V minimum). Product status is Obsolete, making this unsuitable for new designs. RoHS3 compliant, MSL 1.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LF412CDRG4 with LF412CDR?

A: Yes. LF412CDR is the active production equivalent with identical electrical specifications and supply voltage range. The only differences are product status (Active vs. Obsolete) and packaging format options. This is the recommended primary substitute.

Q2: What is the key difference between AD712JRZ, AD712JRZ-REEL, and AD712JRZ-REEL7?

A: All three variants are the same base product (AD712) with identical electrical performance. The differences are packaging formats: AD712JRZ is supplied in Tube packaging, while AD712JRZ-REEL and AD712JRZ-REEL7 are supplied in Cut Tape & Digi-Reel format. Selection depends on your procurement and assembly requirements.

Q3: Why is the minimum supply voltage important for substitution?

A: The LF412CDRG4 operates at a minimum of 7 V. Some substitute parts (TL082BCD, LT1352IS8#TR) have higher minimum supply voltages (10 V and 5 V respectively). If your application uses a 7 V to 9 V supply, only LF412CDR and AD712 variants are compatible. Always verify your circuit's supply voltage against the substitute part's minimum specification.

Q4: Can I use LM833DT or SSM2135SZ as substitutes?

A: These are audio amplifiers with different input characteristics (300 nA input bias current vs. 50 pA). They are functionally compatible in 8-SOIC package and supply voltage, but the significantly higher input bias current makes them unsuitable for high-impedance signal sources. Use only if your application does not require the low input bias current of the original LF412CDRG4.

Q5: What does "J-FET input" mean, and why does it matter for substitution?

A: J-FET input amplifiers have extremely low input bias current (typically in the picoampere range) and high input impedance, making them ideal for precision signal conditioning and high-impedance source applications. Audio amplifiers (LM833DT, SSM2135SZ) use different input stages with much higher bias currents (nanoamperes), which can introduce errors in high-impedance circuits. Voltage Feedback amplifiers (LT1352IS8#TR) use yet another topology. Substitution between different topologies requires application-level verification.

Q6: Is the LT1169CS8#PBF a better substitute than AD712JRZ?

A: Not universally. LT1169CS8#PBF offers superior input bias current (4 pA vs. 25 pA) but significantly lower slew rate (4.2 V/µs vs. 20 V/µs). Choose LT1169CS8#PBF if your application prioritizes ultra-low input bias current and can tolerate reduced slew rate. Choose AD712JRZ if your application requires higher slew rate and bandwidth performance.

Q7: Can I use LT1352IS8#TR as a substitute?

A: LT1352IS8#TR is a Voltage Feedback amplifier (different topology from J-FET) with exceptional slew rate (200 V/µs) but a supply voltage range of 5 V to 30 V, which does not support the 7 V minimum of the LF412CDRG4. Additionally, the topology change requires circuit-level verification. Use only if your application operates above 5 V and you can verify compatibility with the Voltage Feedback topology.

Q8: What does RoHS3 Compliant and MSL 1 mean?

A: RoHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting hazardous materials in electronic components. MSL 1 (Moisture Sensitivity Level 1) means the part has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitutes meet these compliance standards.

Q9: Why is product status (Active vs. Obsolete) important?

A: Active products are in current production with guaranteed long-term availability and support. Obsolete products are no longer manufactured and may have limited remaining inventory. For new designs, always select Active status parts. For legacy system maintenance, Obsolete parts may still be available but with no guarantee of future supply.

Q10: Which substitute should I choose for a new design?

A: For new designs, LF412CDR (Active, identical specifications) is the primary recommendation. If higher performance is acceptable, AD712JRZ variants (Active, superior slew rate and input bias current) are excellent alternatives. Both are J-FET input amplifiers with proven compatibility and long-term availability.

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