TL084BCPT Equivalent & Substitute Parts

Part Overview

The TL084BCPT is a J-FET operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-TSSOP surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. The TL084BCPT 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 4 MHz. Due to its obsolete status, identifying functionally equivalent substitute components is necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	16	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	20	pA
Voltage - Input Offset	1	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	6	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute components for the TL084BCPT are selected based on strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

Mandatory Matching Parameters:

Amplifier Type: J-FET (to maintain input impedance and bias current characteristics)
Number of Circuits: 4 (to preserve pinout and functional density)
Package / Case: 14-TSSOP (to ensure PCB footprint compatibility)
Mounting Type: Surface Mount (to maintain assembly process compatibility)
Voltage - Supply Span: Must encompass or exceed the 6V to 36V range of the TL084BCPT

Electrical Performance Considerations: Substitute parts are grouped by their ability to operate within the supply voltage envelope and maintain functional performance in applications designed for the TL084BCPT. J-FET amplifiers with superior slew rate, gain bandwidth product, or lower input bias current represent enhanced alternatives. General-purpose amplifiers with different input bias current characteristics are included where supply voltage compatibility and package matching are maintained.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Input Bias Current (pA)	Input Offset Voltage (mV)	Supply Current x4 (mA)	Output Current / Channel (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temp (°C)	Product Status
TL084BCPT	STMicroelectronics	J-FET	16	4	20	1	1.4	40	6	36	0 to 70	Obsolete
AD8513ARUZ	Analog Devices Inc.	J-FET	20	8	25	0.1	2.2	70	10	30	-40 to 125	Active
AD8513ARUZ-REEL	Analog Devices Inc.	J-FET	20	8	25	0.1	2.2	70	10	30	-40 to 125	Active
AD8674ARUZ	Analog Devices Inc.	General Purpose	4	10	3000	0.02	3	20	10	36	-40 to 85	Active
AD8674ARUZ-REEL	Analog Devices Inc.	General Purpose	4	10	3000	0.02	3	20	10	36	-40 to 85	Active
AD8684ARUZ	Analog Devices Inc.	J-FET	9	3.5	6	0.35	0.21	12	9	36	-40 to 85	Active
AD8684ARUZ-REEL	Analog Devices Inc.	J-FET	9	3.5	6	0.35	0.21	12	9	36	-40 to 85	Active
ADA4000-4ARUZ	Analog Devices Inc.	J-FET	20	5	5	0.2	1.35	28	8	36	-40 to 125	Active
ADA4000-4ARUZ-RL	Analog Devices Inc.	J-FET	20	5	5	0.2	1.35	28	8	36	-40 to 125	Active
ADA4062-4ARUZ	Analog Devices Inc.	J-FET	3.3	1.4	2	0.75	0.165	20	10	30	-40 to 125	Active
ADA4062-4ARUZ-RL	Analog Devices Inc.	J-FET	3.3	1.4	2	0.75	0.165	20	10	30	-40 to 125	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility):

The AD8513ARUZ and AD8513ARUZ-REEL represent the most direct functional replacements for the TL084BCPT. Both devices are J-FET amplifiers with 4 circuits in 14-TSSOP packaging and active product status. These parts operate across a 10V to 30V supply range, which overlaps the TL084BCPT operating envelope. The AD8513 series exhibits superior slew rate (20V/µs versus 16V/µs) and higher gain bandwidth product (8 MHz versus 4 MHz), providing enhanced performance characteristics. Both variants are ROHS3 compliant with MSL 1 rating.

The ADA4000-4ARUZ and ADA4000-4ARUZ-RL are J-FET amplifiers with active status and extended operating temperature range (-40°C to 125°C). These devices support the full 8V to 36V supply voltage range, encompassing the TL084BCPT specification. The ADA4000 series provides 20V/µs slew rate and 5 MHz gain bandwidth product with lower input bias current (5 pA) compared to the TL084BCPT.

Secondary Substitutes (Performance Trade-offs):

The AD8684ARUZ and AD8684ARUZ-REEL are J-FET amplifiers with active status and 9V to 36V supply range. These devices feature significantly lower supply current (210µA total versus 1.4mA for TL084BCPT), making them suitable for power-constrained applications. The trade-off includes reduced slew rate (9V/µs) and lower output current capability (12 mA per channel).

The ADA4062-4ARUZ and ADA4062-4ARUZ-RL are ultra-low-power J-FET amplifiers with active status and extended temperature range. These devices operate at 10V to 30V supply voltage with extremely low supply current (165µA total). The ADA4062 series is appropriate for applications prioritizing power consumption over dynamic performance.

Alternative Topology (General Purpose):

The AD8674ARUZ and AD8674ARUZ-REEL are general-purpose amplifiers with active status and 10V to 36V supply range. These devices differ from the TL084BCPT in amplifier topology (general purpose versus J-FET) and exhibit significantly higher input bias current (3 nanoamperes). The AD8674 series is suitable for applications where J-FET input characteristics are not critical and where the 10 MHz gain bandwidth product and lower input offset voltage (20 microvolts) provide performance advantages.

All substitute parts listed are ROHS3 compliant with MSL 1 rating, matching the environmental and regulatory compliance profile of the TL084BCPT.

Frequently Asked Questions (FAQ)

Q: Can the AD8513ARUZ directly replace the TL084BCPT without circuit modifications?

A: The AD8513ARUZ shares identical pinout (14-TSSOP) and functional configuration (4-circuit J-FET amplifier). However, the supply voltage minimum specification differs: AD8513ARUZ requires 10V minimum versus 6V for TL084BCPT. Circuits designed to operate at supply voltages below 10V require verification. The AD8513ARUZ exhibits superior performance characteristics (higher slew rate and gain bandwidth product) and is electrically compatible with applications designed for the TL084BCPT operating at 10V or higher.

Q: What is the difference between AD8513ARUZ and AD8513ARUZ-REEL?

A: Both devices are electrically identical with matching electrical specifications. The difference is packaging format: AD8513ARUZ is supplied in Tube packaging, while AD8513ARUZ-REEL is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly process requirements.

Q: Why is the AD8674ARUZ listed as a substitute if it is not a J-FET amplifier?

A: The AD8674ARUZ is included because it meets the mandatory mechanical and functional requirements: 4-circuit configuration, 14-TSSOP package, surface mount mounting, and supply voltage range encompassing the TL084BCPT (10V to 36V). The general-purpose topology represents an alternative for applications where J-FET input characteristics are not essential. Applications requiring J-FET input impedance or bias current characteristics should select J-FET alternatives (AD8513, ADA4000, AD8684, or ADA4062 series).

Q: Which substitute part offers the lowest power consumption?

A: The ADA4062-4ARUZ and ADA4062-4ARUZ-RL offer the lowest supply current at 165 microamperes total (41.25 microamperes per channel). These devices are appropriate for battery-powered or energy-constrained applications. The trade-off includes reduced slew rate (3.3V/µs) and lower gain bandwidth product (1.4 MHz) compared to the TL084BCPT.

Q: Are all substitute parts automotive qualified?

A: The TL084BCPT carries AEC-Q100 automotive qualification. The substitute parts listed do not explicitly reference AEC-Q100 qualification in the provided specifications. Applications requiring automotive qualification should verify qualification status with the component manufacturer or authorized distributor before design implementation.

Q: What is the operating temperature range difference between TL084BCPT and substitute parts?

A: The TL084BCPT operates from 0°C to 70°C. Most substitute parts (AD8513, ADA4000, ADA4062 series) extend the operating range to -40°C to 125°C, providing broader environmental coverage. The AD8674 series operates from -40°C to 85°C. Applications requiring operation below 0°C or above 70°C benefit from these extended-range alternatives.

Q: Can the ADA4000-4ARUZ operate at 6V supply voltage like the TL084BCPT?

A: No. The ADA4000-4ARUZ minimum supply voltage is 8V. Applications requiring 6V operation must select alternatives with 6V minimum specification or redesign the power supply to meet the 8V minimum requirement of the ADA4000 series.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (standard packaging), Cut Tape and Digi-Reel (CT & Digi-Reel), and Tape & Reel (TR). Selection depends on procurement volume and assembly process compatibility. The electrical specifications remain identical across packaging variants for the same base part number.

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