TL084QDG4 Equivalent & Substitute Parts

Part Overview

The TL084QDG4 is a J-FET input operational amplifier with four independent circuits in a 14-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, though 730 pieces remain in new original stock. The TL084QDG4 is qualified to AEC-Q100 automotive standards and operates across the temperature range of -40°C to 125°C. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
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	1.4 mA (x4 Channels)
Current - Output / Channel	10 mA
Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	-40°C to 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL084QDG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture
Number of Circuits: Four independent amplifier circuits
Package / Case: 14-SOIC surface mount configuration
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Parameters:

Slew Rate: 13 V/µs or higher
Gain Bandwidth Product: 3 MHz or higher
Current - Input Bias: 30 pA or lower
Voltage - Input Offset: 3 mV or lower
Current - Supply: 1.4 mA (x4 Channels) or lower
Current - Output / Channel: 10 mA or higher
Voltage - Supply Span: Minimum 10 V, Maximum 30 V or greater
Operating Temperature: -40°C to 125°C or equivalent range

Substitute parts are grouped into two categories: direct equivalents from Texas Instruments and alternative manufacturers offering J-FET quad operational amplifiers with compatible electrical and mechanical specifications.

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 Span Min (V)	Supply Span Max (V)	Temp Range (°C)	Status
TL084QDG4	Texas Instruments	J-FET	13	3	30	3	1.4	10	10	30	-40 to 125	Obsolete
TL084QD	Texas Instruments	J-FET	13	3	30	3	1.4	10	10	30	-40 to 125	Obsolete
ADTL084ARZ	Analog Devices Inc.	J-FET	20	5	2	1.5	1.2	27	8	36	-40 to 125	Active
LF247DT	STMicroelectronics	J-FET	16	4	20	3	1.4	40	44	44	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20	3	1.4	40	44	44	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20	3	1.4	40	44	44	0 to 70	Active
SC2902DR2G	onsemi	General Purpose	—	—	90	2	—	40	3	32	-40 to 105	Active
TL074IYDT	STMicroelectronics	J-FET	13	3	20	3	1.4	40	6	36	-40 to 105	Active
TL084ACDT	STMicroelectronics	J-FET	16	4	20	3	1.4	40	6	36	0 to 70	Active
TL084AIDT	STMicroelectronics	J-FET	16	4	20	3	1.4	40	6	36	-40 to 105	Active
TL084BCDT	STMicroelectronics	J-FET	16	4	20	1	1.4	40	6	36	0 to 70	Active

Engineering Selection Recommendations

Direct Equivalent (Same Manufacturer): TL084QD from Texas Instruments is the direct equivalent to TL084QDG4, differing only in packaging format (Tube versus 14-SOIC). Both are obsolete products. This option provides identical electrical performance but offers no advantage in terms of product longevity.

Recommended Active Substitutes:

1. ADTL084ARZ (Analog Devices Inc.) This J-FET quad operational amplifier is in active production status. It exceeds the TL084QDG4 in slew rate (20 V/µs versus 13 V/µs), gain bandwidth product (5 MHz versus 3 MHz), and output current capability (27 mA versus 10 mA). Input bias current is significantly lower (2 pA versus 30 pA). The supply voltage range is wider (8 V to 36 V versus 10 V to 30 V). Operating temperature range matches the original (-40°C to 125°C). This part is suitable for applications requiring improved performance metrics and long-term availability.

2. TL084AIDT (STMicroelectronics) This J-FET quad operational amplifier maintains the TL084 base product number and is in active production. It provides improved slew rate (16 V/µs) and gain bandwidth product (4 MHz) compared to the original. Input bias current is reduced to 20 pA. Output current capability is increased to 40 mA. The operating temperature range extends to -40°C to 105°C, covering the original specification. This part is AEC-Q100 qualified for automotive applications.

3. TL074IYDT (STMicroelectronics) This J-FET quad operational amplifier maintains identical slew rate (13 V/µs) and gain bandwidth product (3 MHz) to the original TL084QDG4. Input bias current is 20 pA, and output current is 40 mA. The supply voltage range is wider (6 V to 36 V). Operating temperature range is -40°C to 105°C. This part is in active production and offers the closest electrical match to the original specification.

Parts Not Recommended:

SC2902DR2G (onsemi) is a general-purpose amplifier, not a J-FET input device. This fundamental difference in amplifier architecture disqualifies it as a direct substitute despite package compatibility.

LF247DT and LF347D/LF347DT (STMicroelectronics) have fixed supply voltage specifications (44 V minimum and maximum), which do not align with the TL084QDG4 supply range requirements.

Frequently Asked Questions (FAQ)

Q: Can the TL084QDG4 be directly replaced with TL084QD? A: TL084QD is electrically identical to TL084QDG4 and uses the same 14-SOIC package. The difference is packaging format (Tube versus 14-SOIC). However, both parts are obsolete, so this substitution does not address long-term availability concerns.

Q: What is the primary advantage of ADTL084ARZ over the original TL084QDG4? A: ADTL084ARZ is in active production status, ensuring long-term availability. It also provides superior electrical performance: higher slew rate (20 V/µs), higher gain bandwidth product (5 MHz), lower input bias current (2 pA), and greater output current capability (27 mA). The wider supply voltage range (8 V to 36 V) provides additional design flexibility.

Q: Is TL084AIDT suitable for automotive applications? A: Yes. TL084AIDT is AEC-Q100 qualified and carries automotive grade certification, matching the qualification status of the original TL084QDG4. It is in active production and provides improved electrical performance with extended operating temperature range (-40°C to 105°C).

Q: Why is SC2902DR2G not recommended as a substitute? A: SC2902DR2G is a general-purpose operational amplifier, not a J-FET input device. The TL084QDG4 is specifically a J-FET amplifier. This fundamental architectural difference means the devices have different input impedance characteristics, bias current behavior, and noise performance. Package compatibility alone does not qualify it as a functional substitute.

Q: What is the key difference between TL074IYDT and TL084AIDT? A: Both are J-FET quad operational amplifiers in 14-SOIC packages from STMicroelectronics. TL074IYDT maintains the original slew rate (13 V/µs) and gain bandwidth product (3 MHz), making it the closest electrical match. TL084AIDT provides higher slew rate (16 V/µs) and gain bandwidth product (4 MHz). TL084AIDT supports the full automotive temperature range (-40°C to 105°C), while TL074IYDT also covers this range. Selection depends on whether exact performance matching or improved performance is required.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental compliance status of the original TL084QDG4.

Q: Can LF247DT or LF347DT be used as substitutes? A: LF247DT and LF347DT are J-FET quad operational amplifiers in compatible 14-SOIC packages. However, both have fixed supply voltage specifications (44 V minimum and maximum), which do not align with the TL084QDG4 supply range of 10 V to 30 V. These parts are not recommended for direct substitution unless the application circuit is redesigned to accommodate the different supply voltage requirements.

Q: What is the operating temperature range difference between substitute parts? A: The original TL084QDG4 operates from -40°C to 125°C. ADTL084ARZ matches this range exactly. TL084AIDT and TL074IYDT operate from -40°C to 105°C, which covers most industrial and automotive applications but does not extend to the full 125°C upper limit. TL084ACDT and LF347D/LF347DT operate from 0°C to 70°C, which is narrower than the original specification.

Q: Is packaging format (Tube, Cut Tape, Tape & Reel) important for substitution? A: Packaging format affects supply chain logistics and handling but does not impact electrical functionality or circuit performance. All substitute parts use the same 14-SOIC surface mount package. Selection of packaging format should be based on production volume, inventory management, and assembly process requirements.

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