TL084ACDE4 Equivalent & Substitute Parts

Part Overview

The TL084ACDE4 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 708 units remain in stock. The TL084ACDE4 is designed for applications requiring low input bias current and stable offset voltage characteristics typical of J-FET amplifier architectures.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and production planning. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

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	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	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TL084ACDE4 is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET architecture with low input bias current (20–30 pA range)
Number of Circuits: Four independent amplifier circuits
Package: 14-SOIC surface mount form factor
Supply Voltage Range: Minimum 10 V, Maximum 30 V
Output Current per Channel: 40 mA capability
Input Offset Voltage: 3 mV maximum
Operating Temperature: 0°C to 70°C minimum

Substitute Categories:

Category 1: Direct J-FET Equivalents (Highest Compatibility) Parts maintaining J-FET amplifier architecture with electrical parameters within the TL084ACDE4 specification envelope. These include TL084ACDR, TL084ACDT, LF247DT, LF347D, LF347DT, and TL074IYDT. These substitutes preserve the low input bias current characteristic essential for high-impedance signal conditioning applications.

Category 2: General Purpose Amplifier Alternatives (Conditional Compatibility) Parts with general purpose amplifier architecture (ADA4004-4ARZ-RL, AS324AMTR-G1, LM2902EDR2G, MC33074DR2G) offer broader supply voltage ranges and extended operating temperatures but feature higher input bias currents (20–100 nanoamperes). These are suitable only when input bias current specifications are not critical to circuit performance.

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
TL084ACDE4	Texas Instruments	J-FET	13	3	30	3	40	10	30	0 to 70	Obsolete
TL084ACDR	Texas Instruments	J-FET	13	3	30	3	10	10	30	0 to 70	Active
TL084ACDT	STMicroelectronics	J-FET	16	4	20	3	40	6	36	0 to 70	Active
LF247DT	STMicroelectronics	J-FET	16	4	20	3	40	44	44	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20	3	40	44	44	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20	3	40	44	44	0 to 70	Active
TL074IYDT	STMicroelectronics	J-FET	13	3	20	3	40	6	36	-40 to 105	Active
ADA4004-4ARZ-RL	Analog Devices Inc.	General Purpose	2.7	12	40000	0.04	10	10	30	-40 to 125	Active
AS324AMTR-G1	Diodes Incorporated	General Purpose	—	—	20000	2	40	3	36	-40 to 85	Active
LM2902EDR2G	onsemi	General Purpose	—	—	90000	2	40	3	32	-40 to 105	Active
MC33074DR2G	onsemi	General Purpose	13	4.5	100000	1	30	3	44	-40 to 85	Active

Engineering Selection Recommendations

For Direct Replacement (J-FET Architecture Required):

Select TL084ACDT (STMicroelectronics) as the primary substitute. This part maintains J-FET amplifier architecture with input bias current of 20 pA, matching the low-impedance input characteristic of the original TL084ACDE4. The TL084ACDT offers improved slew rate (16 V/µs versus 13 V/µs) and gain bandwidth product (4 MHz versus 3 MHz), with extended supply voltage range (6–36 V) and broader operating temperature span (-40°C to 105°C). Product status is active with 888,600 units in stock, ensuring long-term availability. RoHS3 compliance and AEC-Q100 automotive qualification are maintained.

Alternative J-FET substitutes include LF347DT (STMicroelectronics) with identical electrical performance and highest inventory availability (27,321 units), or TL074IYDT for applications requiring extended temperature range (-40°C to 105°C).

For General Purpose Applications (Input Bias Current Non-Critical):

When input bias current specifications are not performance-limiting, AS324AMTR-G1 (Diodes Incorporated) provides the broadest supply voltage range (3–36 V) with 40 mA output current per channel and active product status. Alternatively, MC33074DR2G (onsemi) offers single-ended output configuration with 13 V/µs slew rate matching the original specification.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance, EAR99 export classification, and REACH unaffected status. Moisture sensitivity level remains at MSL 1 (unlimited) for J-FET variants, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the TL084ACDE4 be replaced with a general purpose amplifier like the LM2902EDR2G?

A: General purpose amplifiers are functionally compatible in 14-SOIC package configuration and support the same supply voltage range. However, input bias current increases from 30 pA to 90 nanoamperes, a 3,000-fold increase. This substitution is valid only for applications where input bias current does not affect circuit performance. High-impedance signal conditioning, transimpedance amplifier, and precision measurement circuits require J-FET architecture.

Q: What is the difference between TL084ACDR and TL084ACDT?

A: Both are Texas Instruments and STMicroelectronics J-FET amplifiers with identical electrical specifications (13 V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, 3 mV input offset voltage). The primary difference is output current per channel: TL084ACDR provides 10 mA while TL084ACDT provides 40 mA, matching the original TL084ACDE4 specification. Select TL084ACDT for applications requiring 40 mA output current.

Q: Are there supply voltage limitations when substituting with LF247DT or LF347DT?

A: LF247DT and LF347DT specify fixed supply voltage of 44 V (both minimum and maximum), differing from the TL084ACDE4 range of 10–30 V. These parts are not suitable for applications with variable or limited supply voltage. Verify power supply design before selecting these substitutes.

Q: Does the TL084ACDT automotive qualification (AEC-Q100) affect non-automotive applications?

A: No. AEC-Q100 qualification indicates enhanced reliability testing and traceability. Non-automotive applications benefit from this qualification without penalty. The TL084ACDT is fully compatible with commercial and industrial designs.

Q: What is the impact of extended operating temperature range on substitute selection?

A: The TL084ACDE4 operates from 0°C to 70°C. Substitutes with extended ranges (-40°C to 105°C) provide design margin for temperature-sensitive applications but are not required for designs within the original specification. Extended temperature range substitutes do not compromise performance within the original operating window.

Q: Can multiple substitute parts be used interchangeably on the same PCB?

A: Yes. All recommended J-FET substitutes share identical 14-SOIC package geometry and pinout. Electrical parameter variations (slew rate, gain bandwidth product, input bias current) are within acceptable tolerance for most applications. Verify circuit performance through simulation or prototype testing when mixing substitute parts in multi-amplifier designs.

Q: Is the TL084ACDR recommended over TL084ACDT despite lower output current?

A: TL084ACDR is recommended only for applications requiring maximum 10 mA output current per channel. For designs requiring 40 mA output current matching the original TL084ACDE4 specification, TL084ACDT is the correct selection. Verify output current requirements in the circuit design before part selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message