TL084ACDRG4 Equivalent & Substitute Parts

Part Overview

The TL084ACDRG4 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 8,032 units remain in stock as new original inventory. The TL084ACDRG4 operates across a supply voltage range of 10V to 30V with a slew rate of 13V/µs and gain bandwidth product of 3 MHz. Due to its obsolete status, equivalent substitute parts with active product status are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value
Amplifier Type	J-FET
Number of Circuits	4
Slew Rate	13V/µs
Gain Bandwidth Product	3 MHz
Current - Input Bias	30 pA
Voltage - Input Offset	3 mV
Current - Supply	1.4mA (x4 Channels)
Current - Output / Channel	10 mA
Voltage - Supply Span (Min)	10 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL084ACDRG4 is determined by the following critical parameters: amplifier type (J-FET), number of circuits (4), package type (14-SOIC), mounting method (surface mount), and electrical specifications including slew rate, gain bandwidth product, input bias current, and supply voltage range.

The substitute parts are grouped into two categories:

Category 1: Direct Texas Instruments TL084 Series Variants These parts share the identical base product number (TL084) and maintain J-FET amplifier architecture with four circuits. Substitutes include TL084ACDR, TL084ACDT, TL084AIDT, and TL084BCDT. These variants differ primarily in packaging format (Cut Tape & Digi-Reel versus Tape & Reel), product status (active versus obsolete), operating temperature ranges, and automotive qualification levels. All maintain the 14-SOIC package footprint and core electrical characteristics.

Category 2: Cross-Manufacturer J-FET Alternatives These parts include LF247DT, LF347D, and LF347DT from STMicroelectronics, and TL074IYDT also from STMicroelectronics. These devices maintain J-FET amplifier type, four-circuit configuration, and 14-SOIC package compatibility. They exhibit enhanced electrical performance in slew rate (16V/µs) and gain bandwidth product (4 MHz), with improved input bias current (20 pA) and higher output current capability (40 mA per channel).

Category 3: General Purpose Amplifier Alternatives MC33174VDR2G and MC34074VDR2G from onsemi represent general purpose amplifier architectures rather than J-FET types. These devices maintain four-circuit configuration and 14-SOIC package but operate with significantly different electrical characteristics, including lower slew rates and different supply current specifications.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
TL084ACDRG4	Texas Instruments	J-FET	13	3	30	3	10	10	30	0 ~ 70	Obsolete
TL084ACDR	Texas Instruments	J-FET	13	3	30	3	10	10	30	0 ~ 70	Active
TL084ACDT	STMicroelectronics	J-FET	16	4	20	3	40	6	36	0 ~ 70	Active
TL084AIDT	STMicroelectronics	J-FET	16	4	20	3	40	6	36	-40 ~ 105	Active
TL084BCDT	STMicroelectronics	J-FET	16	4	20	1	40	6	36	0 ~ 70	Active
LF247DT	STMicroelectronics	J-FET	16	4	20	3	40	44	44	-40 ~ 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20	3	40	44	44	0 ~ 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20	3	40	44	44	0 ~ 70	Active
TL074IYDT	STMicroelectronics	J-FET	13	3	20	3	40	6	36	-40 ~ 105	Active
MC33174VDR2G	onsemi	General Purpose	2.1	1.8	20000	2	27	3	44	-40 ~ 125	Active
MC34074VDR2G	onsemi	General Purpose	13	4.5	100	1	30	3	44	-40 ~ 125	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

TL084ACDR from Texas Instruments is the direct equivalent with identical electrical specifications and active product status. This part maintains the original supply voltage range (10V to 30V), slew rate (13V/µs), and gain bandwidth product (3 MHz). The primary difference is packaging format (Cut Tape & Digi-Reel versus the original configuration) and active product status, making it the preferred choice for direct replacement in new designs.

TL084ACDT from STMicroelectronics provides enhanced performance with increased slew rate (16V/µs), higher gain bandwidth product (4 MHz), improved input bias current (20 pA), and doubled output current capability (40 mA per channel). This part operates across a narrower supply voltage range (6V to 36V), which encompasses the original 10V to 30V specification. The TL084ACDT carries automotive qualification (AEC-Q100) and active product status, suitable for applications requiring higher performance margins.

Secondary Substitutes (J-FET Architecture Maintained)

TL084AIDT from STMicroelectronics matches the TL084ACDT electrical specifications but extends the operating temperature range to -40°C to 105°C with automotive qualification. This variant is appropriate for designs requiring extended temperature operation.

TL084BCDT from STMicroelectronics provides the same enhanced electrical performance as TL084ACDT with the addition of improved input offset voltage (1 mV versus 3 mV), automotive qualification, and active product status.

LF347DT and LF347D from STMicroelectronics maintain J-FET architecture with four circuits and offer enhanced slew rate (16V/µs) and output current (40 mA per channel). These parts operate with a fixed supply voltage specification (44V) and active product status.

TL074IYDT from STMicroelectronics maintains the original slew rate (13V/µs) and gain bandwidth product (3 MHz) with improved input bias current (20 pA) and extended temperature range (-40°C to 105°C).

Alternative Substitutes (Different Amplifier Architecture)

MC34074VDR2G from onsemi provides general purpose amplifier architecture with enhanced gain bandwidth product (4.5 MHz) and slew rate (13V/µs). This part operates across a wider supply voltage range (3V to 44V) and extended temperature range (-40°C to 125°C). Selection of this part requires verification that general purpose amplifier characteristics are acceptable for the application, as J-FET input bias current specifications differ significantly.

MC33174VDR2G from onsemi represents a lower-performance general purpose alternative with reduced slew rate (2.1V/µs) and gain bandwidth product (1.8 MHz). This part is suitable only for applications with relaxed bandwidth requirements.

Frequently Asked Questions (FAQ)

Q: Can TL084ACDT be used as a direct replacement for TL084ACDRG4?

A: Yes. TL084ACDT maintains J-FET amplifier architecture, four-circuit configuration, and 14-SOIC package compatibility. The supply voltage range (6V to 36V) encompasses the original specification (10V to 30V). Enhanced electrical performance (16V/µs slew rate, 4 MHz gain bandwidth product, 40 mA output current) provides improved performance margins. Verification that the narrower supply voltage range and enhanced specifications are compatible with the application is required.

Q: What is the difference between TL084ACDT and TL084AIDT?

A: Both parts share identical electrical specifications. TL084AIDT extends the operating temperature range to -40°C to 105°C, compared to TL084ACDT at 0°C to 70°C. Both carry automotive qualification (AEC-Q100). Selection depends on whether extended temperature operation is required.

Q: Why do LF247DT and LF347DT specify a fixed supply voltage of 44V?

A: The supply voltage specification of 44V indicates the maximum rated supply voltage. These parts operate across the full range from the minimum supply voltage (not specified in the provided data) to 44V maximum. The original TL084ACDRG4 operates from 10V to 30V, which falls within the LF247DT and LF347DT operating range.

Q: Can MC34074VDR2G replace TL084ACDRG4?

A: MC34074VDR2G maintains four-circuit configuration and 14-SOIC package compatibility with active product status. However, it uses general purpose amplifier architecture rather than J-FET input design. Input bias current is significantly higher (100 nA versus 30 pA), which may affect circuit performance in applications sensitive to input bias current. Verification of circuit compatibility is required before substitution.

Q: What is the significance of automotive qualification (AEC-Q100)?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. Parts carrying this qualification (TL084ACDT, TL084AIDT, TL084BCDT) are suitable for automotive applications and provide additional quality assurance. Non-automotive qualified parts may be used in non-automotive applications without restriction.

Q: Are all substitute parts available in 14-SOIC package?

A: Yes. All substitute parts listed maintain the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB footprint compatibility with the original TL084ACDRG4.

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Both are tape and reel formats for automated assembly. Cut Tape & Digi-Reel format allows for smaller quantity orders with individual part access. Tape & Reel format is optimized for high-volume production runs. Electrical specifications and component functionality are identical; packaging format selection depends on procurement and assembly requirements.

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