TL084ACD Equivalent & Substitute Parts

Part Overview

The TL084ACD is a J-FET input operational amplifier with four independent circuits in a 14-SOIC surface mount package, manufactured by STMicroelectronics. This device is classified as obsolete, though 2700 units remain in stock. The TL084ACD is qualified to AEC-Q100 automotive standards and operates across a supply voltage range of 6V to 36V with an operating temperature range of 0°C to 70°C. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
Amplifier Type	J-FET
Number of Circuits	4
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	16V/µs
Gain Bandwidth Product	3 MHz
Current - Input Bias	20 pA
Voltage - Input Offset	3 mV
Current - Supply	1.4mA (x4 Channels)
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	6 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL084ACD is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: 4 independent amplifier circuits
Package / Case: 14-SOIC surface mount form factor
Mounting Type: Surface Mount compatibility

Secondary Compatibility Parameters:

Slew Rate: 16V/µs or greater
Gain Bandwidth Product: 3 MHz or greater
Current - Input Bias: 20 pA or lower
Voltage - Input Offset: 3 mV or lower
Current - Supply: 1.4mA (x4 Channels) or lower
Current - Output / Channel: 40 mA or greater
Voltage - Supply Span: Minimum 6V to Maximum 36V coverage
Operating Temperature: 0°C to 70°C minimum coverage
RoHS3 Compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Direct Equivalent (Same Base Product Number): TL084BCD maintains the TL084 base product designation with identical circuit count and package, though with different electrical performance characteristics.

Functional Equivalents (J-FET Amplifiers): AD8513ARZ, AD8684ARZ, and their packaging variants provide J-FET input amplification with four circuits in 14-SOIC packages. These parts exceed the minimum performance requirements of the TL084ACD.

Alternative Category (General Purpose Amplifiers): AD8674ARZ and variants provide four-circuit amplification in 14-SOIC packages but utilize general purpose amplifier topology rather than J-FET input design.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Package / Case	Slew Rate	Gain Bandwidth Product	Current - Input Bias	Voltage - Input Offset	Current - Supply	Current - Output / Channel	Voltage - Supply Span (Min)	Voltage - Supply Span (Max)	Operating Temperature	Product Status
TL084ACD	STMicroelectronics	J-FET	4	14-SOIC	16V/µs	3 MHz	20 pA	3 mV	1.4mA	40 mA	6 V	36 V	0°C ~ 70°C	Obsolete
TL084BCD	Texas Instruments	J-FET	4	14-SOIC	13V/µs	3 MHz	30 pA	2 mV	1.4mA	10 mA	10 V	30 V	0°C ~ 70°C	Obsolete
AD8513ARZ	Analog Devices Inc.	J-FET	4	14-SOIC	20V/µs	8 MHz	25 pA	100 µV	2.2mA	70 mA	10 V	30 V	-40°C ~ 125°C	Active
AD8513ARZ-REEL	Analog Devices Inc.	J-FET	4	14-SOIC	20V/µs	8 MHz	25 pA	100 µV	2.2mA	70 mA	10 V	30 V	-40°C ~ 125°C	Active
AD8513ARZ-REEL7	Analog Devices Inc.	J-FET	4	14-SOIC	20V/µs	8 MHz	25 pA	100 µV	2.2mA	70 mA	10 V	30 V	-40°C ~ 125°C	Active
AD8674ARZ	Analog Devices Inc.	General Purpose	4	14-SOIC	4V/µs	10 MHz	3 nA	20 µV	3mA	20 mA	10 V	36 V	-40°C ~ 85°C	Active
AD8674ARZ-REEL	Analog Devices Inc.	General Purpose	4	14-SOIC	4V/µs	10 MHz	3 nA	20 µV	3mA	20 mA	10 V	36 V	-40°C ~ 85°C	Active
AD8674ARZ-REEL7	Analog Devices Inc.	General Purpose	4	14-SOIC	4V/µs	10 MHz	3 nA	20 µV	3mA	20 mA	10 V	36 V	-40°C ~ 85°C	Active
AD8684ARZ	Analog Devices Inc.	J-FET	4	14-SOIC	9V/µs	3.5 MHz	6 pA	350 µV	210µA	12 mA	9 V	36 V	-40°C ~ 85°C	Active
AD8684ARZ-REEL	Analog Devices Inc.	J-FET	4	14-SOIC	9V/µs	3.5 MHz	6 pA	350 µV	210µA	12 mA	9 V	36 V	-40°C ~ 85°C	Active
AD8684ARZ-REEL7	Analog Devices Inc.	J-FET	4	14-SOIC	9V/µs	3.5 MHz	6 pA	350 µV	210µA	12 mA	9 V	36 V	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Equivalent Selection:

TL084BCD from Texas Instruments serves as a direct equivalent within the TL084 product family. Both devices share identical circuit count, package form factor, and operating temperature range. TL084BCD maintains ROHS3 compliance and MSL 1 rating. However, TL084BCD is also classified as obsolete, limiting its long-term availability advantage.

Primary Active Substitutes (J-FET Amplifiers):

The AD8513ARZ series (AD8513ARZ, AD8513ARZ-REEL, AD8513ARZ-REEL7) from Analog Devices Inc. represents the strongest functional equivalent. All three variants maintain J-FET amplifier topology with four circuits in 14-SOIC packages. The AD8513 series exceeds TL084ACD performance specifications with 20V/µs slew rate, 8 MHz gain bandwidth product, and superior input offset voltage of 100µV. All variants are active products with extended operating temperature range (-40°C to 125°C), ensuring long-term availability. ROHS3 compliance and MSL 1 rating are maintained across all packaging options.

The AD8684ARZ series (AD8684ARZ, AD8684ARZ-REEL, AD8684ARZ-REEL7) from Analog Devices Inc. provides an alternative J-FET solution with lower supply current (210µA vs. 1.4mA) and superior input bias current (6 pA). The AD8684 series maintains 14-SOIC packaging and active product status. Operating temperature range extends to -40°C to 85°C. ROHS3 compliance and MSL 1 rating apply.

Secondary Alternative (General Purpose Amplifiers):

The AD8674ARZ series (AD8674ARZ, AD8674ARZ-REEL, AD8674ARZ-REEL7) from Analog Devices Inc. provides four-circuit amplification in 14-SOIC packages with active product status. This series utilizes general purpose amplifier topology rather than J-FET input design. The AD8674 series offers extended supply voltage range (10V to 36V) matching the TL084ACD maximum specification. Operating temperature range extends to -40°C to 85°C. ROHS3 compliance and MSL 1 rating are maintained. Selection of AD8674 variants is appropriate only when J-FET input characteristics are not required by the application.

Packaging Considerations:

All substitute parts are available in multiple packaging formats. Standard tube packaging (ARZ) is suitable for lower-volume applications. Tape & Reel (TR) packaging (REEL and REEL7 variants) is appropriate for automated assembly processes. Inventory availability varies across packaging options, with AD8513ARZ-REEL7 and AD8674ARZ-REEL7 offering the highest stock levels.

Frequently Asked Questions (FAQ)

Q: Can TL084BCD directly replace TL084ACD in all applications?

A: TL084BCD shares the same base product number, circuit count, and 14-SOIC package. Both operate across 0°C to 70°C temperature range. However, TL084BCD has reduced output current per channel (10 mA vs. 40 mA) and narrower supply voltage range (10V to 30V vs. 6V to 36V). Verify that your application does not require the higher output current or extended supply voltage range of the TL084ACD before selecting TL084BCD.

Q: What is the primary advantage of AD8513ARZ over TL084ACD?

A: AD8513ARZ is an active product with guaranteed long-term availability, whereas TL084ACD is obsolete. AD8513ARZ exceeds TL084ACD performance across multiple parameters: 20V/µs slew rate (vs. 16V/µs), 8 MHz gain bandwidth product (vs. 3 MHz), and 100µV input offset voltage (vs. 3 mV). Extended operating temperature range (-40°C to 125°C) provides additional design flexibility.

Q: When should AD8684ARZ be selected instead of AD8513ARZ?

A: AD8684ARZ is appropriate when minimizing supply current is critical. AD8684ARZ draws only 210µA total supply current compared to 2.2mA for AD8513ARZ. AD8684ARZ also provides superior input bias current (6 pA vs. 25 pA). However, AD8684ARZ has lower slew rate (9V/µs vs. 20V/µs) and reduced output current per channel (12 mA vs. 70 mA). Select AD8684ARZ only when low power consumption is a primary design requirement.

Q: Is AD8674ARZ suitable as a replacement for TL084ACD?

A: AD8674ARZ is a general purpose amplifier, not a J-FET input device. Selection of AD8674ARZ is appropriate only when J-FET input characteristics (high input impedance, low input bias current) are not required. AD8674ARZ offers lower slew rate (4V/µs) and reduced output current per channel (20 mA). If your application specifically requires J-FET input amplification, select AD8513ARZ or AD8684ARZ instead.

Q: What is the difference between AD8513ARZ, AD8513ARZ-REEL, and AD8513ARZ-REEL7?

A: All three variants are electrically identical with identical performance specifications. The differences are packaging format only. AD8513ARZ is supplied in tube packaging suitable for manual handling and lower-volume applications. AD8513ARZ-REEL is supplied in Tape & Reel format. AD8513ARZ-REEL7 is supplied in Cut Tape and Digi-Reel format. Select based on your assembly process requirements and inventory management preferences.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (TL084BCD, AD8513ARZ series, AD8684ARZ series, and AD8674ARZ series) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. All parts maintain REACH Unaffected status and EAR99 export classification.

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

A: TL084ACD operates from 6V minimum. TL084BCD requires 10V minimum. AD8513ARZ series requires 10V minimum. AD8684ARZ series requires 9V minimum. AD8674ARZ series requires 10V minimum. Verify that your power supply design meets the minimum voltage requirement of your selected substitute part.

Q: Can I use AD8513ARZ in automotive applications?

A: AD8513ARZ is not qualified to AEC-Q100 automotive standards. TL084ACD carries AEC-Q100 qualification. If your application requires automotive qualification, verify that your system design does not mandate AEC-Q100 compliance before selecting AD8513ARZ or other non-qualified alternatives.

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