TL084ACD Equivalent & Substitute Parts

Part Overview

The TL084ACD is a J-FET input operational amplifier containing four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this device is classified as obsolete, though 2700 units remain in stock. The TL084ACD is characterized by low input bias current (30 pA), moderate slew rate (13 V/µs), and a gain bandwidth product of 3 MHz, making it suitable for precision signal conditioning and low-noise amplification applications.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain planning, and new product development. Substitute parts must maintain functional compatibility while meeting the electrical and mechanical requirements of the original design.

Key Parameters

Parameter	TL084ACD 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	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Package compatibility: 14-SOIC surface mount form factor
Number of circuits: Four independent amplifier circuits
Amplifier type: J-FET input topology (preferred for low input bias current applications)
Supply voltage range: Minimum 10 V to maximum 30 V
Operating temperature range: 0°C to 70°C or broader
Output current capability: Minimum 40 mA per channel
Slew rate: 13 V/µs or higher
Gain bandwidth product: 3 MHz or higher

Substitution Categories:

Category 1: Direct J-FET Equivalents — Parts maintaining J-FET input topology with comparable electrical performance. These provide the closest functional replacement with similar input bias current characteristics.

Category 2: General Purpose Amplifiers — Parts with general purpose topology offering broader supply voltage ranges and extended temperature ratings. These substitute when J-FET input characteristics are not critical to the application.

Category 3: Enhanced Performance Alternatives — Parts exceeding the original specifications in slew rate, gain bandwidth product, or temperature range while maintaining package and circuit count compatibility.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Output Current (mA)	Product Status
TL084ACD	Texas Instruments	J-FET	13	3	30	3	10	30	0 to 70	40	Obsolete
TL084ACDR	Texas Instruments	J-FET	13	3	30	3	10	30	0 to 70	10	Active
ADTL084ARZ-REEL	Analog Devices Inc.	J-FET	20	5	2	1.5	8	36	-40 to 125	27	Active
LF347D	STMicroelectronics	J-FET	16	3	20	3	44	44	0 to 70	40	Active
AS324MTR-E1	Diodes Incorporated	General Purpose	—	—	20000	2	3	36	-40 to 85	40	Active
AS324MTR-G1	Diodes Incorporated	General Purpose	—	—	20000	2	3	36	-40 to 85	40	Active
LM224DR2G	onsemi	General Purpose	—	1	90000	2	3	32	-25 to 85	40	Active
LM2902DR2G	onsemi	General Purpose	—	1	90000	2	3	32	-40 to 105	40	Active
NCV33074DR2G	onsemi	General Purpose	13	4.5	100000	1	3	44	-40 to 85	30	Active
NCV34074VDR2G	onsemi	General Purpose	13	4.5	100000	1	3	44	-40 to 125	30	Active
SC2902DR2G	onsemi	General Purpose	—	1	90000	2	3	32	-40 to 105	40	Active

Engineering Selection Recommendations

Tier 1: Direct Replacement (Active Status)

The TL084ACDR from Texas Instruments is the manufacturer-recommended direct replacement. It maintains identical electrical specifications to the TL084ACD with J-FET input topology, matching slew rate (13 V/µs), gain bandwidth product (3 MHz), and input bias current (30 pA). The primary difference is reduced output current per channel (10 mA versus 40 mA), which may limit applications requiring higher output drive capability. This part is ROHS3 compliant and carries active product status.

Tier 2: Enhanced J-FET Alternative

The ADTL084ARZ-REEL from Analog Devices Inc. provides superior performance characteristics while maintaining J-FET input topology. It offers higher slew rate (20 V/µs), increased gain bandwidth product (5 MHz), significantly lower input bias current (2 pA), and extended operating temperature range (-40°C to 125°C). The supply voltage range is broader (8 V to 36 V). This part is suitable for applications requiring improved precision and wider temperature operation. ROHS3 compliant and active status.

Tier 3: J-FET Topology with Fixed Supply

The LF347D from STMicroelectronics maintains J-FET input characteristics with comparable slew rate (16 V/µs) and gain bandwidth product (3 MHz). However, this part operates at a fixed supply voltage of ±22 V (44 V span), making it suitable only for applications with symmetric dual supply configurations. Output current capability (40 mA) matches the original specification. ROHS3 compliant and active status.

Tier 4: General Purpose Alternatives

General purpose amplifiers including AS324MTR-E1, AS324MTR-G1, LM224DR2G, LM2902DR2G, and SC2902DR2G provide functional substitution with broader supply voltage ranges (3 V to 32-36 V) and extended temperature ratings. These parts sacrifice the low input bias current characteristic of J-FET topology (20 nA to 100 nA versus 30 pA), making them unsuitable for applications requiring ultra-low input bias current. All are ROHS3 compliant with active product status.

Tier 5: Enhanced General Purpose with Automotive Qualification

The NCV33074DR2G and NCV34074VDR2G from onsemi offer general purpose topology with improved slew rate (13 V/µs) and gain bandwidth product (4.5 MHz). The NCV34074VDR2G extends operating temperature to -40°C to 125°C. Both carry automotive qualification (AEC-Q100) and ROHS3 compliance. Output current per channel is reduced to 30 mA. These parts are suitable for automotive and extended temperature applications where J-FET input characteristics are not critical.

Frequently Asked Questions (FAQ)

Q: Can the TL084ACDR directly replace the TL084ACD in all applications?

A: The TL084ACDR maintains identical electrical specifications and J-FET input topology. However, output current per channel is reduced from 40 mA to 10 mA. Applications requiring output currents exceeding 10 mA per channel require external buffering or alternative parts.

Q: What is the primary advantage of the ADTL084ARZ-REEL over the TL084ACDR?

A: The ADTL084ARZ-REEL provides superior performance with higher slew rate (20 V/µs versus 13 V/µs), increased gain bandwidth product (5 MHz versus 3 MHz), and significantly lower input bias current (2 pA versus 30 pA). Extended operating temperature range (-40°C to 125°C) and broader supply voltage range (8 V to 36 V) provide additional flexibility. These improvements are beneficial for precision instrumentation and wide-temperature applications.

Q: Why do general purpose amplifiers have higher input bias currents than J-FET types?

A: General purpose amplifiers typically employ bipolar input stages, which inherently exhibit higher input bias currents (nanoamperes to microamperes) compared to J-FET input stages (picoamperes). This difference is fundamental to the input stage topology and cannot be overcome through design optimization.

Q: Is the LF347D suitable as a substitute for single supply applications?

A: No. The LF347D operates at a fixed supply voltage of ±22 V (44 V total span). It is designed exclusively for symmetric dual supply configurations and is not suitable for single supply applications.

Q: What packaging formats are available for substitute parts?

A: All substitute parts maintain the 14-SOIC surface mount package form factor. Packaging options vary by manufacturer and include Cut Tape (CT), Digi-Reel, Tape & Reel (TR), and Tube formats. Selection depends on procurement volume and assembly requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. Moisture sensitivity levels vary, with most parts rated MSL 1 (Unlimited) and one part (AS324MTR-E1) rated MSL 3 (168 Hours).

Q: Which substitute part offers the broadest operating temperature range?

A: The ADTL084ARZ-REEL and NCV34074VDR2G both operate from -40°C to 125°C, providing the widest temperature coverage among available substitutes.

Q: Can general purpose amplifiers replace J-FET types in low-noise applications?

A: General purpose amplifiers are not recommended for applications where input bias current must remain below 100 pA. The significantly higher input bias current (20 nA to 100 nA) of general purpose types introduces additional noise and offset drift in precision signal conditioning circuits. J-FET alternatives (TL084ACDR or ADTL084ARZ-REEL) are required for such applications.

Q: What is the significance of the AEC-Q100 qualification on the NCV33074DR2G and NCV34074VDR2G?

A: AEC-Q100 qualification indicates these parts meet automotive industry reliability and quality standards. These parts are suitable for automotive applications requiring enhanced reliability testing and traceability. Non-automotive applications may use these parts without restriction.

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