TL084ACN Equivalent & Substitute Parts

Part Overview

The TL084ACN is a J-FET input operational amplifier with four independent circuits in a 14-DIP package, manufactured by STMicroelectronics. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The TL084ACN is qualified to AEC-Q100 automotive standards and operates across a supply voltage range of 6V to 36V with a slew rate of 16V/µs and gain bandwidth product of 3 MHz.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Slew Rate	16	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	20	pA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	6	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q100	—

Substitute Part Grouping Explanation

Substitution of the TL084ACN is determined by the following critical parameters: amplifier type (J-FET), number of circuits (4), package format (14-DIP through-hole), and operating temperature range (0°C to 70°C). The TL084ACN operates with a minimum supply voltage of 6V and maximum of 36V, with a slew rate of 16V/µs and gain bandwidth product of 3 MHz.

Substitute parts are grouped into two categories:

Category 1: J-FET Amplifiers with Comparable Performance Parts that maintain J-FET input architecture with four circuits in 14-DIP packaging. These substitutes include AD713JNZ, LF347BN, LF347BN/NOPB, LF347N, LF347N/NOPB, LF444ACN/NOPB, and LF444CN/NOPB. These parts share the same package, circuit count, and amplifier type, making them direct functional replacements where supply voltage and performance specifications align.

Category 2: General Purpose Amplifiers Parts that provide four-circuit 14-DIP packaging but use general purpose amplifier architecture rather than J-FET input. AD704JNZ and LM248N fall into this category. These substitutes are applicable in applications where J-FET input characteristics are not mandatory and where the lower input bias current and offset voltage specifications of general purpose designs are acceptable.

Category 3: Low-Power J-FET Amplifiers LF444ACN/NOPB and LF444CN/NOPB represent ultra-low-power J-FET alternatives with significantly reduced supply current (600µA vs. 1.4mA) but lower bandwidth (1 MHz vs. 3 MHz). These are suitable for power-constrained applications.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Product Status	RoHS Status
TL084ACN	STMicroelectronics	J-FET	16	3	20	3	1.4	10	6	36	Obsolete	Non-compliant
AD704JNZ	Analog Devices Inc.	General Purpose	0.1	0.8	100	0.05	1.5	15	4	36	Active	ROHS3 Compliant
AD713JNZ	Analog Devices Inc.	J-FET	20	4	10	0.3	10	25	9	36	Active	ROHS3 Compliant
LF347BN	onsemi	J-FET	13	4	50	3	7.2	—	36	36	Obsolete	Non-compliant
LF347BN/NOPB	Texas Instruments	J-FET	13	4	50	3	7.2	—	36	36	Active	ROHS3 Compliant
LF347N	STMicroelectronics	J-FET	16	4	20	3	1.4	40	44	44	Obsolete	ROHS3 Compliant
LF347N/NOPB	Texas Instruments	J-FET	13	4	50	5	7.2	—	36	36	Active	ROHS3 Compliant
LF444ACN/NOPB	Texas Instruments	J-FET	1	1	10	2	0.6	14	44	44	Active	ROHS3 Compliant
LF444CN/NOPB	Texas Instruments	J-FET	1	1	10	3	0.6	14	36	36	Active	ROHS3 Compliant
LM248N	STMicroelectronics	General Purpose	0.5	1.3	30000	1	2.1	25	44	44	Obsolete	ROHS3 Compliant
LM348N	STMicroelectronics	General Purpose	0.5	1	30000	1	2.1	25	44	44	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Functional Replacement with Active Product Status:

AD713JNZ (Analog Devices Inc.) is the primary recommended substitute. It maintains J-FET input architecture with four circuits in 14-DIP packaging and is currently in active production status. The AD713JNZ exceeds TL084ACN performance specifications with a slew rate of 20V/µs (versus 16V/µs), gain bandwidth product of 4 MHz (versus 3 MHz), and superior input bias current of 10 pA (versus 20 pA). The AD713JNZ is ROHS3 compliant and carries no RoHS restrictions. Supply voltage range extends from 9V to 36V, which covers the TL084ACN operating range above 9V. This part is suitable for applications requiring the full TL084ACN supply voltage range down to 6V only if external voltage regulation is implemented.

LF347N/NOPB (Texas Instruments) provides an alternative J-FET substitute with active product status and ROHS3 compliance. This part maintains the same slew rate (13V/µs) and gain bandwidth product (4 MHz) as the LF347BN but with active manufacturing support. The LF347N/NOPB operates at a fixed supply voltage of 36V, which limits its applicability to designs requiring the full 6V to 36V range of the TL084ACN.

For Low-Power Applications:

LF444CN/NOPB (Texas Instruments) is recommended for power-constrained designs. This J-FET amplifier operates with only 600µA supply current (versus 1.4mA for TL084ACN) while maintaining four circuits in 14-DIP packaging. The trade-off is reduced bandwidth (1 MHz versus 3 MHz) and slew rate (1V/µs versus 16V/µs). This part is ROHS3 compliant and in active production. Supply voltage is fixed at 36V.

For General Purpose Applications Where J-FET Input is Not Required:

AD704JNZ (Analog Devices Inc.) offers a general purpose four-circuit amplifier in 14-DIP packaging with active product status and ROHS3 compliance. This part is not recommended as a direct substitute due to significantly different amplifier architecture (general purpose versus J-FET), but may be considered in applications where the lower input bias current specification (100 pA versus 20 pA for TL084ACN) and reduced slew rate (0.1V/µs) are acceptable trade-offs.

Compliance Considerations:

The TL084ACN is RoHS non-compliant and obsolete. All recommended active substitutes (AD713JNZ, LF347N/NOPB, LF444CN/NOPB) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can AD713JNZ directly replace TL084ACN in all applications?

A: AD713JNZ is functionally compatible with TL084ACN in applications where the supply voltage remains at or above 9V. The TL084ACN minimum supply voltage is 6V, while AD713JNZ minimum is 9V. For designs operating below 9V, external voltage regulation or alternative substitutes must be evaluated. Both parts share J-FET input architecture, four-circuit configuration, and 14-DIP packaging.

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

A: J-FET input amplifiers (AD713JNZ, LF347N/NOPB, LF444CN/NOPB) feature extremely low input bias current (10-50 pA range) and are suitable for high-impedance signal sources and precision measurement applications. General Purpose amplifiers (AD704JNZ, LM248N, LM348N) have significantly higher input bias current (30 nanoamperes to 100 picoamperes) but offer different performance characteristics. The TL084ACN is a J-FET device; substitution with general purpose types requires application-level verification.

Q: Are all substitute parts available in the same 14-DIP package?

A: Yes. All substitute parts listed are packaged in 14-DIP (0.300", 7.62mm) through-hole format, identical to the TL084ACN. This ensures mechanical and electrical compatibility with existing printed circuit board layouts without modification.

Q: What is the significance of RoHS compliance status?

A: The TL084ACN is RoHS non-compliant, reflecting its obsolete status and older manufacturing processes. All active substitute parts (AD713JNZ, LF347N/NOPB, LF444CN/NOPB) are ROHS3 compliant, meeting current European Union Restriction of Hazardous Substances regulations. For new designs and procurement, ROHS3-compliant parts are required in most commercial and industrial applications.

Q: How do supply voltage ranges affect substitution decisions?

A: The TL084ACN operates from 6V to 36V. AD713JNZ operates from 9V to 36V, limiting its use in applications below 9V. LF347N/NOPB and LF444CN/NOPB operate at fixed 36V supply. For designs requiring the full 6V to 36V range, external voltage regulation or alternative design approaches are necessary when using these substitutes.

Q: What performance trade-offs exist with LF444CN/NOPB?

A: LF444CN/NOPB reduces supply current to 600µA (versus 1.4mA for TL084ACN), making it suitable for battery-powered or power-limited applications. However, bandwidth is reduced to 1 MHz (versus 3 MHz) and slew rate to 1V/µs (versus 16V/µs). This substitute is appropriate only for applications where reduced bandwidth and slew rate are acceptable.

Q: Can LF347N from STMicroelectronics be used instead of LF347N/NOPB from Texas Instruments?

A: Both parts share identical electrical specifications (16V/µs slew rate, 4 MHz gain bandwidth product, 20 pA input bias current, 3 mV input offset voltage). However, the STMicroelectronics LF347N is obsolete and RoHS non-compliant, while the Texas Instruments LF347N/NOPB is active and ROHS3 compliant. For new designs, the Texas Instruments variant is recommended.

Q: What is the automotive qualification significance of TL084ACN?

A: The TL084ACN carries AEC-Q100 automotive qualification, indicating it meets automotive industry reliability and quality standards. Among the substitute parts listed, none explicitly state AEC-Q100 qualification in the provided specifications. For automotive applications requiring AEC-Q100 certification, verification with manufacturers is necessary before substitution.

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