TL084BCNG4 Equivalent & Substitute Parts

Part Overview

The TL084BCNG4 is a J-FET input operational amplifier featuring four independent circuits in a 14-DIP package. Manufactured by Texas Instruments, this device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. The TL084BCNG4 operates across a supply voltage range of 10V to 30V with a slew rate of 13V/µs and gain bandwidth product of 3 MHz, making it suitable for precision analog signal processing applications requiring low input bias current and low input offset voltage.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Slew Rate	13	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	30	pA
Voltage - Input Offset	2	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TL084BCNG4 is determined by the following critical parameters: amplifier type (J-FET vs. General Purpose), number of circuits (4), package type (14-DIP through-hole), supply voltage range compatibility, slew rate, gain bandwidth product, input bias current, and input offset voltage.

The substitute parts are grouped into two categories:

Category 1: Direct J-FET Substitutes — Parts maintaining J-FET amplifier topology with four circuits in 14-DIP packaging. These include TL084BCN (Texas Instruments), AD713JNZ (Analog Devices), LT1058ACN#PBF, and LT1058CN#PBF (Analog Devices). These substitutes preserve the low input bias current characteristic essential for high-impedance signal sources.

Category 2: General Purpose Substitutes — Parts with general-purpose amplifier topology, four circuits in 14-DIP packaging, and compatible supply voltage ranges. These include AD704JNZ (Analog Devices), LT1114ACN#PBF, LT1114CN#PBF, LT1114IN, and LT1114IN#PBF (Analog Devices), and LT1125ACN#PBF (Analog Devices). These substitutes offer different performance characteristics and are suitable for applications where J-FET input characteristics are not mandatory.

All substitute parts maintain 14-DIP through-hole packaging, ROHS3 compliance, and operating temperature range of 0°C to 70°C (with LT1114IN variants extending to -40°C to 85°C).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV/µV)	Supply Min (V)	Supply Max (V)	Product Status
TL084BCNG4	Texas Instruments	J-FET	13	3	30	2 mV	10	30	Obsolete
TL084BCN	Texas Instruments	J-FET	13	3	30	2 mV	10	30	Active
AD704JNZ	Analog Devices	General Purpose	0.1	0.8	100	50 µV	4	36	Active
AD713JNZ	Analog Devices	J-FET	20	4	10	300 µV	9	36	Active
LT1058ACN#PBF	Analog Devices	J-FET	14	5	5	180 µV	20	36	Active
LT1058CN#PBF	Analog Devices	J-FET	13	5	7	250 µV	20	36	Active
LT1114ACN#PBF	Analog Devices	General Purpose	0.3	0.75	70	20 µV	2	40	Active
LT1114CN#PBF	Analog Devices	General Purpose	0.3	0.75	70	20 µV	2	40	Active
LT1114IN	Analog Devices	General Purpose	0.3	0.75	70	20 µV	2	40	Active
LT1114IN#PBF	Analog Devices	General Purpose	0.3	0.75	70	20 µV	2	40	Active
LT1125ACN#PBF	Analog Devices	General Purpose	4.5	12.5	8000	25 µV	8	44	Active

Engineering Selection Recommendations

Primary Recommendation: TL084BCN

The TL084BCN is the direct active equivalent of the TL084BCNG4. This part maintains identical electrical specifications including J-FET amplifier topology, 13V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, and 2 mV input offset voltage. The TL084BCN is manufactured by Texas Instruments with active product status, ROHS3 compliance, and is available in tube packaging. This substitute provides seamless design compatibility with no circuit modifications required.

Secondary Recommendation: LT1058CN#PBF or LT1058ACN#PBF

For applications requiring enhanced performance, the LT1058 series (Analog Devices) offers J-FET input topology with improved specifications: 5 MHz gain bandwidth product, lower input bias current (7 pA for LT1058CN#PBF, 5 pA for LT1058ACN#PBF), and extended supply voltage range (20V to 36V). These parts are active, ROHS3 compliant, and suitable for precision analog applications. Note that the minimum supply voltage is 20V, which may require circuit redesign if the original design operates below this threshold.

Alternative Recommendation: AD713JNZ

The AD713JNZ (Analog Devices) provides J-FET input topology with enhanced slew rate (20V/µs) and higher gain bandwidth product (4 MHz). Input bias current is lower (10 pA) and supply voltage range is 9V to 36V. This part is active and ROHS3 compliant. The AD713JNZ is suitable for applications requiring faster signal processing while maintaining J-FET input characteristics.

General Purpose Alternatives: LT1114 Series

The LT1114 series (LT1114ACN#PBF, LT1114CN#PBF, LT1114IN, LT1114IN#PBF) offers general-purpose amplifier topology with significantly lower supply current (350µA per four channels versus 1.4mA for TL084BCNG4) and extended supply voltage range (2V to 40V). These parts are active and ROHS3 compliant. The LT1114IN and LT1114IN#PBF variants support extended operating temperature range (-40°C to 85°C). These substitutes are appropriate for low-power applications where J-FET input characteristics are not critical.

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can TL084BCN be used as a direct replacement for TL084BCNG4?

A: Yes. The TL084BCN is electrically and mechanically identical to the TL084BCNG4. Both parts feature J-FET amplifier topology, four circuits, 14-DIP through-hole packaging, identical slew rate (13V/µs), gain bandwidth product (3 MHz), input bias current (30 pA), and input offset voltage (2 mV). The primary difference is product status: TL084BCNG4 is obsolete while TL084BCN is active. No circuit modifications are required.

Q: What is the difference between J-FET and General Purpose amplifier types?

A: J-FET input amplifiers feature extremely low input bias current (typically in the picoampere range) and are suitable for high-impedance signal sources. General Purpose amplifiers have higher input bias current (typically in the nanoampere range) but offer lower input offset voltage and often lower supply current. Selection depends on application requirements for input impedance and signal source characteristics.

Q: Can I use LT1114 series parts as substitutes for TL084BCNG4?

A: LT1114 series parts are functionally compatible in 14-DIP through-hole packaging and four-circuit configuration. However, they are general-purpose amplifiers rather than J-FET input devices. Input bias current is significantly higher (70 pA versus 30 pA). These substitutes are suitable for applications where J-FET input characteristics are not mandatory and where lower supply current consumption is beneficial. Circuit performance may differ in high-impedance applications.

Q: What are the supply voltage compatibility considerations?

A: The TL084BCNG4 operates with supply voltage range of 10V to 30V. Substitute parts have varying ranges: TL084BCN (10V to 30V), AD713JNZ (9V to 36V), LT1058 series (20V to 36V), LT1114 series (2V to 40V), and LT1125ACN#PBF (8V to 44V). When selecting a substitute, verify that the original circuit supply voltage falls within the substitute part's specified range. Parts with higher minimum supply voltage requirements may necessitate circuit redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in 14-DIP (0.300", 7.62mm) through-hole packaging, maintaining mechanical compatibility with the original TL084BCNG4. Packaging variations (tube, tray) are available for different substitute part numbers but do not affect electrical performance or circuit compatibility.

Q: Can I use AD704JNZ as a substitute?

A: AD704JNZ is functionally compatible in terms of package and circuit count (four circuits in 14-DIP). However, it is a general-purpose amplifier with significantly different performance characteristics: slew rate of 0.1V/µs (versus 13V/µs), gain bandwidth product of 0.8 MHz (versus 3 MHz), and input bias current of 100 pA (versus 30 pA). This substitute is suitable only for applications where the original TL084BCNG4's performance specifications are not critical.

Q: What is the difference between LT1058ACN#PBF and LT1058CN#PBF?

A: Both parts are J-FET input amplifiers with identical package and circuit configuration. LT1058ACN#PBF has slightly lower input bias current (5 pA versus 7 pA) and lower input offset voltage (180 µV versus 250 µV). Both operate with 20V to 36V supply range and 13-14V/µs slew rate. Selection between these variants depends on precision requirements for input offset voltage and bias current specifications.

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