TL084QDRG4 Equivalent & Substitute Parts

Part Overview

The TL084QDRG4 is a J-FET input operational amplifier containing four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this automotive-grade component (AEC-Q100 qualified) operates across a -40°C to 125°C temperature range with a supply voltage span of 10V to 30V. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

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	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	-40°C ~ 125°C
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL084QDRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET (maintains input bias current and offset voltage characteristics)
Number of Circuits: 4 (functional equivalence)
Package / Case: 14-SOIC form factor (physical and electrical compatibility)
Mounting Type: Surface Mount (assembly compatibility)

Secondary Compatibility Parameters:

Slew Rate: 13V/µs minimum (performance threshold)
Gain Bandwidth Product: 3 MHz minimum (frequency response)
Current - Input Bias: 30 pA maximum (input stage performance)
Voltage - Input Offset: 3 mV maximum (precision requirement)
Current - Supply: 1.4mA per channel (power consumption)
Current - Output / Channel: 10 mA minimum (output drive capability)
Voltage - Supply Span: 10V to 30V operating range (power supply compatibility)
Operating Temperature: -40°C to 125°C (thermal envelope)
Grade: Automotive with AEC-Q100 qualification (reliability standard)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Texas Instruments TL084 Series): Parts maintaining identical base specifications with variations in packaging format and temperature grade. These include TL084QDR (Tape & Reel packaging, active status).

Category B - Cross-Manufacturer J-FET Alternatives (STMicroelectronics & onsemi): Parts with J-FET input architecture meeting or exceeding core electrical specifications. These include LF247DT, LF347D, LF347DT, TL074ID, TL074IYDT, and TL084ACDT variants. These parts demonstrate enhanced performance in slew rate, gain bandwidth product, and output current capability while maintaining automotive qualification where applicable.

Category C - General Purpose Alternatives (onsemi): Parts with general purpose amplifier architecture (LM2902EDR2G, SC2902DG) offering broader supply voltage range and lower input bias current, suitable for applications where J-FET input characteristics are not mandatory.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Circuits	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Grade	Status
TL084QDRG4	Texas Instruments	J-FET	4	13	3	30	3	10	10	30	-40 ~ 125	Automotive	Discontinued
TL084QDR	Texas Instruments	J-FET	4	13	3	30	3	10	10	30	-40 ~ 125	Automotive	Active
LF247DT	STMicroelectronics	J-FET	4	16	4	20	3	40	44	44	-40 ~ 105	—	Active
LF347D	STMicroelectronics	J-FET	4	16	3	20	3	40	44	44	0 ~ 70	—	Active
LF347DT	STMicroelectronics	J-FET	4	16	4	20	3	40	44	44	0 ~ 70	—	Active
LM2902EDR2G	onsemi	General Purpose	4	—	—	90 nA	2	40	3	32	-40 ~ 105	—	Active
SC2902DG	onsemi	General Purpose	4	—	—	90 nA	2	40	3	32	-40 ~ 105	—	Active
TL074ID	STMicroelectronics	J-FET	4	13	3	20	3	40	6	36	-40 ~ 105	—	Active
TL074IYDT	STMicroelectronics	J-FET	4	13	3	20	3	40	6	36	-40 ~ 105	—	Active
TL084ACDT	STMicroelectronics	J-FET	4	16	4	20	3	40	6	36	0 ~ 70	Automotive	Active
TL084AIDT	STMicroelectronics	J-FET	4	16	4	20	3	40	6	36	-40 ~ 105	Automotive	Active

Engineering Selection Recommendations

Tier 1 - Preferred Direct Replacement:

TL084QDR (Texas Instruments) is the primary substitute for TL084QDRG4. This part maintains identical electrical specifications, automotive grade designation, and AEC-Q100 qualification. The only difference is packaging format (Tape & Reel versus the original Digi-Reel format). This part is currently active with 2200 units in stock, ensuring supply continuity.

Tier 2 - Automotive-Qualified J-FET Alternatives:

TL084AIDT (STMicroelectronics) provides enhanced performance characteristics (16V/µs slew rate, 4 MHz gain bandwidth product, 40 mA output current) while maintaining automotive grade and AEC-Q100 qualification. Operating temperature range extends to -40°C to 105°C. This part is active with 5400 units in stock.

TL084ACDT (STMicroelectronics) offers identical enhanced performance specifications but with restricted operating temperature range (0°C to 70°C). Automotive grade and AEC-Q100 qualification are maintained. This part has the highest inventory availability (888,600 units).

Tier 3 - Non-Automotive J-FET Alternatives:

TL074IYDT and TL074ID (STMicroelectronics) maintain J-FET input architecture with identical slew rate and gain bandwidth product to the original part. Supply voltage range is expanded (6V to 36V). These parts lack automotive qualification but are suitable for non-automotive applications requiring J-FET input characteristics.

LF347DT and LF347D (STMicroelectronics) provide enhanced slew rate (16V/µs) and gain bandwidth product (4 MHz) with J-FET input architecture. Operating temperature range is restricted (0°C to 70°C). These parts lack automotive qualification.

LF247DT (STMicroelectronics) offers the highest performance metrics (16V/µs slew rate, 4 MHz gain bandwidth product, 40 mA output current) with J-FET input architecture. Supply voltage specification differs (44V fixed). This part lacks automotive qualification.

Tier 4 - General Purpose Alternatives:

LM2902EDR2G and SC2902DG (onsemi) employ general purpose amplifier architecture with significantly lower input bias current (90 nA versus 30 pA). These parts are suitable only for applications where J-FET input characteristics are not required. Supply voltage range is broader (3V to 32V). These parts lack automotive qualification.

Selection Criteria Summary:

For automotive applications requiring AEC-Q100 compliance and J-FET input characteristics, select TL084QDR, TL084AIDT, or TL084ACDT based on temperature range requirements and inventory availability.

For non-automotive applications prioritizing J-FET input performance, select from TL074IYDT, LF347DT, or LF247DT based on supply voltage and temperature requirements.

For applications where general purpose amplifier architecture is acceptable, LM2902EDR2G or SC2902DG provide broader supply voltage compatibility.

Frequently Asked Questions (FAQ)

Q1: Can TL084QDR directly replace TL084QDRG4 in existing designs?

A: Yes. TL084QDR maintains identical electrical specifications, automotive grade, and AEC-Q100 qualification. The packaging format differs (Tape & Reel versus Digi-Reel), but the 14-SOIC physical form factor and pin configuration are identical. No circuit modifications are required.

Q2: What is the primary difference between TL084QDRG4 and TL084AIDT?

A: TL084AIDT provides enhanced performance: slew rate increases from 13V/µs to 16V/µs, gain bandwidth product increases from 3 MHz to 4 MHz, and output current per channel increases from 10 mA to 40 mA. Input bias current improves from 30 pA to 20 pA. Both maintain automotive qualification and AEC-Q100 compliance. Supply voltage range differs slightly (6V to 36V for TL084AIDT versus 10V to 30V for TL084QDRG4).

Q3: Are J-FET input amplifiers required for this application, or can general purpose alternatives be used?

A: This determination depends on application requirements. J-FET input amplifiers (TL084 series, LF347 series, TL074 series) provide extremely low input bias current (20-30 pA) and are suitable for high-impedance signal sources, precision instrumentation, and low-noise applications. General purpose amplifiers (LM2902 series) feature higher input bias current (90 nA) but offer broader supply voltage ranges and lower cost. Verify application circuit requirements before selecting a general purpose alternative.

Q4: What is the significance of automotive grade and AEC-Q100 qualification?

A: Automotive grade designation and AEC-Q100 qualification indicate the component has undergone rigorous testing for reliability, temperature cycling, and performance stability under automotive operating conditions. These certifications are mandatory for automotive applications and recommended for industrial and harsh-environment applications. Non-automotive alternatives lack these certifications and should not be used in automotive designs without explicit engineering approval.

Q5: Can LF247DT or LF347DT be used as direct substitutes despite different supply voltage specifications?

A: LF247DT and LF347DT feature fixed 44V supply voltage specification, which differs from the TL084QDRG4 range of 10V to 30V. These parts are not direct substitutes for applications requiring the specific 10V to 30V supply range. However, if your application operates within the 44V specification, these parts provide enhanced performance characteristics. Verify power supply compatibility before selection.

Q6: Why do some substitute parts show different operating temperature ranges?

A: Operating temperature range is determined by component design and manufacturing process. TL084QDRG4 operates from -40°C to 125°C (extended automotive range). Some alternatives (TL084ACDT, LF347D, LF347DT) operate from 0°C to 70°C (commercial range). Select parts matching your application's thermal requirements. Automotive applications typically require -40°C to 125°C range.

Q7: What packaging formats are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Tube. All maintain the 14-SOIC physical form factor and pin configuration. Packaging format affects procurement and assembly processes but does not impact electrical performance or circuit compatibility. Select based on your manufacturing assembly requirements.

Q8: Is inventory availability a factor in substitute part selection?

A: Yes. Inventory levels affect procurement lead times and cost. TL084ACDT has the highest inventory (888,600 units), while TL074IYDT has lower availability (4,059 units). For long-term production programs, prioritize parts with stable active status and adequate inventory levels. Consult current distributor inventory before finalizing design selections.

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