TL084CDG4 Equivalent & Substitute Parts

Part Overview

The TL084CDG4 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 638 pieces remain in new original stock. The TL084CDG4 operates across a supply voltage range of 10V to 30V with an operating temperature range of 0°C to 70°C, making it suitable for general-purpose analog signal processing applications requiring low input bias current and low input offset voltage characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and long-term component availability. Substitute parts must maintain functional compatibility while meeting the same electrical performance requirements and package specifications.

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	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TL084CDG4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: 4 independent operational amplifiers
Package / Case: 14-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Slew Rate: 13 V/µs or greater
Gain Bandwidth Product: 3 MHz or greater
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 greater
Voltage - Supply Span: Minimum 10V, Maximum 30V or greater
Operating Temperature: 0°C to 70°C minimum coverage
RoHS3 Compliance

Substitute parts are grouped into two categories based on electrical performance alignment:

Category 1: Direct Electrical Equivalents Parts that match or exceed all key electrical parameters of the TL084CDG4 while maintaining identical supply voltage specifications (10V to 30V).

Category 2: Enhanced Performance Substitutes Parts that exceed key electrical parameters (higher slew rate, higher gain bandwidth product, lower input bias current, higher output current capability) but operate across wider supply voltage ranges (6V to 36V or 44V), providing superior performance margins and extended operational flexibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Packaging
TL084CDG4	Texas Instruments	Obsolete	13	3	30	3	10	10	30	0 to 70	14-SOIC
TL084CDR	Texas Instruments	Active	13	3	30	3	10	10	30	0 to 70	14-SOIC
TL084CD	STMicroelectronics	Active	16	3	30	3	10	6	36	0 to 70	14-SOIC
TL084ACDT	STMicroelectronics	Active	16	4	20	3	40	6	36	0 to 70	14-SOIC
TL084AIDT	STMicroelectronics	Active	16	4	20	3	40	6	36	-40 to 105	14-SOIC
TL084BCDT	STMicroelectronics	Active	16	4	20	1	40	6	36	0 to 70	14-SOIC
LF247DT	STMicroelectronics	Active	16	4	20	3	40	44	44	-40 to 105	14-SOIC
LF347D	STMicroelectronics	Active	16	3	20	3	40	44	44	0 to 70	14-SOIC
LF347DT	STMicroelectronics	Active	16	4	20	3	40	44	44	0 to 70	14-SOIC
TL074IYDT	STMicroelectronics	Active	13	3	20	3	40	6	36	-40 to 105	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: TL084CDR

The TL084CDR, manufactured by Texas Instruments, is the direct functional equivalent of the TL084CDG4. This part maintains identical electrical specifications (13 V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, 10 mV input offset voltage, 10 mA output current per channel) and identical supply voltage range (10V to 30V). The TL084CDR is currently in active production status with 169,460 pieces in new original stock, ensuring long-term availability. Both parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications. This substitution requires no circuit redesign or performance verification.

Secondary Recommendation: TL084CD (STMicroelectronics)

The TL084CD from STMicroelectronics provides enhanced electrical performance with 16 V/µs slew rate and extended supply voltage range (6V to 36V) while maintaining the same 3 MHz gain bandwidth product and 30 pA input bias current. This part is suitable for applications where the extended lower supply voltage limit (6V versus 10V) provides operational flexibility. The TL084CD is active in production with 3,600 pieces in stock and carries AEC-Q100 automotive qualification, indicating enhanced reliability screening.

Tertiary Recommendation: TL084ACDT (STMicroelectronics)

The TL084ACDT offers superior electrical performance with 16 V/µs slew rate, 4 MHz gain bandwidth product, 20 pA input bias current, and 40 mA output current per channel. Extended supply voltage range (6V to 36V) and AEC-Q100 automotive qualification are included. This part is suitable for designs requiring enhanced performance margins. Stock availability is excellent at 888,600 pieces.

Extended Temperature Range Option: TL084AIDT

For applications requiring extended operating temperature range (-40°C to 105°C), the TL084AIDT provides identical electrical performance to TL084ACDT with automotive-grade qualification. This part is recommended for industrial and automotive applications with demanding thermal requirements.

Precision Input Offset Voltage Option: TL084BCDT

The TL084BCDT reduces input offset voltage to 1 mV (versus 3 mV standard), providing enhanced precision for sensitive analog signal processing. This part maintains all other performance enhancements of the TL084ACDT series and carries AEC-Q100 qualification.

All recommended substitutes are ROHS3 compliant, carry identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications, and maintain surface mount 14-SOIC packaging compatibility.

Frequently Asked Questions (FAQ)

Q1: Can TL084CDR be used as a direct replacement for TL084CDG4 without circuit modification?

A: Yes. The TL084CDR is electrically and mechanically identical to the TL084CDG4. Both parts feature identical slew rate (13 V/µs), gain bandwidth product (3 MHz), input bias current (30 pA), input offset voltage (3 mV), output current (10 mA per channel), and supply voltage range (10V to 30V). Both are packaged in 14-SOIC surface mount form factor. No circuit redesign, component value changes, or performance verification testing is required.

Q2: What is the primary advantage of TL084CD over TL084CDR?

A: The TL084CD provides two key advantages: enhanced slew rate (16 V/µs versus 13 V/µs) and extended supply voltage range (6V to 36V versus 10V to 30V). The lower supply voltage minimum (6V) enables operation in battery-powered and low-voltage applications. The higher slew rate improves transient response characteristics. Both parts maintain identical input bias current (30 pA) and input offset voltage (3 mV).

Q3: When should TL084ACDT be selected instead of TL084CD?

A: TL084ACDT is selected when applications require superior performance margins beyond the TL084CD specification. Key enhancements include higher gain bandwidth product (4 MHz versus 3 MHz), lower input bias current (20 pA versus 30 pA), and higher output current capability (40 mA per channel versus 10 mA per channel). These improvements benefit high-speed signal processing, low-noise preamplifier designs, and applications requiring higher load-driving capability. AEC-Q100 automotive qualification is included.

Q4: Are all substitute parts compatible with the 14-SOIC package footprint?

A: Yes. All substitute parts listed are packaged in 14-SOIC (0.154", 3.90mm Width) surface mount form factor. PCB footprints, solder pad layouts, and component placement are identical. No PCB redesign is required for any listed substitute.

Q5: What is the difference between TL084ACDT and TL084AIDT?

A: Both parts are electrically identical with 16 V/µs slew rate, 4 MHz gain bandwidth product, 20 pA input bias current, and 40 mA output current per channel. The primary difference is operating temperature range: TL084ACDT operates 0°C to 70°C, while TL084AIDT operates -40°C to 105°C. TL084AIDT is selected for industrial, automotive, and aerospace applications requiring extended temperature performance. Both carry AEC-Q100 automotive qualification.

Q6: Why do some substitutes specify 44V supply voltage range instead of a range?

A: Parts such as LF247DT and LF347D specify 44V as both minimum and maximum supply voltage, indicating these devices are designed for fixed 44V dual-supply operation (±22V). These parts are not recommended for TL084CDG4 replacement in applications requiring ±5V to ±15V dual-supply operation, as they lack the flexible supply voltage range of the TL084 series.

Q7: What does AEC-Q100 qualification indicate?

A: AEC-Q100 is an automotive electronics council qualification standard indicating the part has undergone enhanced reliability screening, including temperature cycling, vibration testing, and electrical parameter verification. Parts carrying AEC-Q100 qualification (TL084CD, TL084ACDT, TL084AIDT, TL084BCDT) are suitable for automotive, industrial, and mission-critical applications requiring higher reliability assurance than standard commercial-grade components.

Q8: Can LF347DT or LF247DT be used as substitutes for TL084CDG4?

A: LF347DT and LF247DT are not recommended as direct substitutes. While both are J-FET input quad operational amplifiers in 14-SOIC packaging, they specify fixed 44V supply voltage operation (±22V dual supply) rather than the flexible 10V to 30V range of TL084CDG4. Circuit redesign and power supply modification would be required. These parts are suitable only for applications specifically designed for ±22V dual-supply operation.

Q9: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All listed substitute parts maintain ROHS3 compliance status. No environmental or regulatory compliance changes occur with any substitution.

Q10: What inventory considerations should guide substitute part selection?

A: TL084CDR offers the largest active inventory (169,460 pieces) among direct equivalents, ensuring immediate availability and long-term supply continuity. TL084ACDT provides the highest inventory level overall (888,600 pieces) among enhanced-performance alternatives. For applications where performance enhancement is acceptable, TL084ACDT selection provides superior supply security and cost optimization through high-volume availability.

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