TL084IDRG4 Equivalent & Substitute Parts

Part Overview

The TL084IDRG4 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 2172 units remain in stock. The TL084IDRG4 is designed for applications requiring low input bias current and stable offset voltage characteristics across the -40°C to 85°C operating temperature range.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply assurance, and new production planning. Substitute parts must maintain functional compatibility through matching electrical specifications and package form factors.

Key Parameters

Parameter	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	10	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-40 to 85	°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 TL084IDRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input topology (low input bias current, typically 20–30 pA)
Number of Circuits: Four independent amplifier stages
Package Form Factor: 14-SOIC surface mount configuration
Supply Voltage Range: Minimum 10 V, maximum 30 V
Operating Temperature: -40°C to 85°C or wider range
Slew Rate: 13 V/µs or higher
Gain Bandwidth Product: 3 MHz or higher
Input Offset Voltage: 3 mV or lower
Output Current per Channel: 10 mA or higher

Substitution Groups:

Group 1: Direct J-FET Equivalents (Highest Compatibility) Parts maintaining J-FET input architecture with matching or superior electrical performance and identical package specifications. These include TL084IDR (Texas Instruments, active status), LF247DT, LF347D, and LF347DT (STMicroelectronics, active status).

Group 2: General Purpose Alternatives (Functional Compatibility) Parts with general purpose amplifier topology offering broader supply voltage ranges and higher output current capability. These include ADA4004-4ARZ-R7 (Analog Devices), AS324MTR-E1 (Diodes Incorporated), LM324DR2G, LM324EDR2G, MC34074DR2G, and MC34074VDR2G (onsemi). These devices sacrifice the ultra-low input bias current characteristic of J-FET designs but provide enhanced performance in other parameters.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA/nA)	Input Offset (mV/µV)	Supply Min (V)	Supply Max (V)	Output Current (mA)	Temp Range (°C)	Status
TL084IDRG4	Texas Instruments	J-FET	13	3	30 pA	3 mV	10	30	10	-40 to 85	Obsolete
TL084IDR	Texas Instruments	J-FET	13	3	30 pA	3 mV	10	30	10	-40 to 85	Active
LF247DT	STMicroelectronics	J-FET	16	4	20 pA	3 mV	44	44	40	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20 pA	3 mV	44	44	40	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20 pA	3 mV	44	44	40	0 to 70	Active
ADA4004-4ARZ-R7	Analog Devices	General Purpose	2.7	12	40 nA	40 µV	10	30	10	-40 to 125	Active
AS324MTR-E1	Diodes Incorporated	General Purpose	—	—	20 nA	2 mV	3	36	40	-40 to 85	Active
LM324DR2G	onsemi	General Purpose	—	1	90 nA	2 mV	3	32	40	0 to 70	Active
LM324EDR2G	onsemi	General Purpose	—	1	90 nA	2 mV	3	32	40	0 to 70	Active
MC34074DR2G	onsemi	General Purpose	13	4.5	100 nA	1 mV	3	44	30	0 to 70	Active
MC34074VDR2G	onsemi	General Purpose	13	4.5	100 nA	1 mV	3	44	30	-40 to 125	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

TL084IDR is the primary recommended substitute. Manufactured by Texas Instruments with active product status, it maintains identical electrical specifications to the TL084IDRG4 across all critical parameters: J-FET input topology, 13 V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, and 10–30 V supply range. The only difference is packaging format (Cut Tape & Digi-Reel versus the original specification). This part ensures seamless design compatibility with 25,200 units currently in stock.

For J-FET Architecture Preservation (Enhanced Performance):

LF247DT and LF347DT (STMicroelectronics) maintain J-FET input characteristics with improved specifications: 16 V/µs slew rate, 4 MHz gain bandwidth product, and 20 pA input bias current. However, these parts specify a 44 V symmetric supply range, which differs from the TL084IDRG4's 10–30 V asymmetric range. LF247DT supports -40°C to 105°C operation, extending the upper temperature limit. Both parts are ROHS3 compliant with MSL 1 rating.

For Broader Supply Voltage Compatibility:

AS324MTR-E1 (Diodes Incorporated) and MC34074VDR2G (onsemi) offer extended supply voltage ranges (3–36 V and 3–44 V respectively) suitable for applications requiring lower supply voltages. AS324MTR-E1 provides 56,300 units in stock with -40°C to 85°C operation. MC34074VDR2G extends temperature range to -40°C to 125°C with 13 V/µs slew rate matching the original part.

For Cost-Optimized Solutions:

LM324DR2G and LM324EDR2G (onsemi) represent the most economical general purpose alternatives with 105,300 and 25,969 units respectively in stock. These parts sacrifice J-FET input characteristics (90 nA input bias current versus 30 pA) but provide 40 mA output current per channel and 3–32 V supply range. Suitable for applications where ultra-low input bias current is not critical.

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q1: Can TL084IDR directly replace TL084IDRG4 in existing designs?

Yes. TL084IDR is electrically identical to TL084IDRG4, maintaining the same J-FET input topology, slew rate (13 V/µs), gain bandwidth product (3 MHz), input bias current (30 pA), and supply voltage range (10–30 V). Both operate across -40°C to 85°C. The primary difference is packaging format. TL084IDR is available in Cut Tape & Digi-Reel format with 25,200 units in stock, compared to the obsolete TL084IDRG4.

Q2: What is the key difference between J-FET and general purpose amplifier substitutes?

J-FET input amplifiers (TL084IDR, LF247DT, LF347DT) feature extremely low input bias current (20–30 pA), making them suitable for high-impedance signal sources and precision measurement applications. General purpose amplifiers (ADA4004-4ARZ-R7, AS324MTR-E1, LM324 series, MC34074 series) have higher input bias current (40 nA to 100 nA) but offer broader supply voltage ranges, higher output current capability, and lower cost. Selection depends on application requirements for input impedance and signal conditioning.

Q3: Are the STMicroelectronics LF247DT and LF347DT compatible with the original 10–30 V supply specification?

LF247DT and LF347DT specify a 44 V symmetric supply range, which differs from the TL084IDRG4's 10–30 V asymmetric range. These parts will operate correctly within the 10–30 V window, but their datasheets do not guarantee performance optimization for this narrower range. For applications strictly requiring 10–30 V operation, TL084IDR remains the preferred choice.

Q4: Which substitute offers the widest operating temperature range?

MC34074VDR2G (onsemi) and ADA4004-4ARZ-R7 (Analog Devices) both support -40°C to 125°C operation, extending 40°C above the original TL084IDRG4 specification (-40°C to 85°C). LF247DT extends to 105°C. Selection depends on whether the extended upper temperature limit is required for the application.

Q5: What is the significance of MSL (Moisture Sensitivity Level) rating?

MSL 1 (unlimited) indicates the component has no moisture sensitivity restrictions and requires no special handling or storage conditions. MSL 3 (168 hours) requires controlled storage and handling to prevent moisture absorption. TL084IDRG4, TL084IDR, LF247DT, LF347D, and LF347DT all carry MSL 1 rating. ADA4004-4ARZ-R7 and AS324MTR-E1 carry MSL 3, requiring more stringent storage protocols.

Q6: Can I use LM324 series parts as a cost-effective alternative?

LM324DR2G and LM324EDR2G are suitable for applications where J-FET input characteristics are not essential. These parts offer 40 mA output current per channel (versus 10 mA for TL084IDRG4), lower cost, and broader supply voltage range (3–32 V). However, input bias current is 90 nA compared to 30 pA, making them unsuitable for high-impedance signal conditioning. Verify application requirements before substitution.

Q7: Are all substitute parts ROHS3 compliant?

Yes. All recommended substitute parts carry ROHS3 compliance certification and are REACH unaffected, meeting current environmental regulations for lead-free manufacturing and hazardous substance restrictions.

Q8: What packaging formats are available for substitute parts?

Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Tube. Selection depends on production volume and assembly requirements. For high-volume production, Tape & Reel format is standard. For prototype or low-volume applications, Cut Tape or Tube formats may be preferred.

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