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TL084AID Equivalent & Substitute Parts
Part Overview
The TL084AID is a J-FET operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, though 641 pieces remain in new original stock. The TL084AID is qualified to AEC-Q100 automotive standards and operates across a temperature range of -40°C to 105°C with a supply voltage span of 6V to 36V.
Due to the obsolete product status of the TL084AID, identification of equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability. Substitute parts must maintain functional compatibility through matching amplifier topology, circuit count, package form factor, and critical electrical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 16 | V/µs |
| Gain Bandwidth Product | 4 | MHz |
| Current - Input Bias | 20 | pA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply (x4 Channels) | 1.4 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 6 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -40 to 105 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the TL084AID are grouped based on strict adherence to the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: J-FET topology required for input bias current and offset voltage characteristics
- Number of Circuits: 4 independent amplifier circuits
- Package / Case: 14-SOIC (0.154", 3.90mm Width) for mechanical and electrical compatibility
- Mounting Type: Surface Mount for PCB assembly compatibility
- Voltage - Supply Span: Minimum 6V and maximum 36V to encompass the TL084AID operating range
- Operating Temperature: Minimum -40°C and maximum 105°C or higher
Secondary Compatibility Parameters:
- Slew Rate: 16V/µs or greater
- Gain Bandwidth Product: 4 MHz or greater
- Current - Input Bias: 20 pA or lower
- Voltage - Input Offset: 3 mV or lower
- Current - Supply: 1.4 mA (x4 Channels) or lower
- Current - Output / Channel: 40 mA or greater
Substitute parts meeting all primary criteria and most secondary criteria are classified as direct functional equivalents. Parts meeting primary criteria but with variations in secondary parameters are classified as compatible alternatives with specific application considerations.
Parameter Comparison
| Parameter | TL084AID | AD8513ARZ | AD8684ARZ | ADA4000-4ARZ |
|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Product Status | Obsolete | Active | Active | Active |
| Amplifier Type | J-FET | J-FET | J-FET | J-FET |
| Number of Circuits | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Slew Rate (V/µs) | 16 | 20 | 9 | 20 |
| Gain Bandwidth Product (MHz) | 4 | 8 | 3.5 | 5 |
| Current - Input Bias (pA) | 20 | 25 | 6 | 5 |
| Voltage - Input Offset (mV) | 3 | 0.1 | 0.35 | 0.2 |
| Current - Supply (mA, x4 Channels) | 1.4 | 2.2 | 0.21 | 1.35 |
| Current - Output / Channel (mA) | 40 | 70 | 12 | 28 |
| Voltage - Supply Span (Min, V) | 6 | 10 | 9 | 8 |
| Voltage - Supply Span (Max, V) | 36 | 30 | 36 | 36 |
| Operating Temperature (°C) | -40 to 105 | -40 to 125 | -40 to 85 | -40 to 125 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
AD8513ARZ / AD8513ARZ-REEL / AD8513ARZ-REEL7 (Analog Devices Inc.)
The AD8513 series represents the closest functional equivalent to the TL084AID. All three packaging variants (Tube, Tape & Reel, and Cut Tape & Digi-Reel) maintain identical electrical specifications. This J-FET amplifier meets all primary substitution criteria with superior performance in slew rate (20V/µs vs. 16V/µs) and gain bandwidth product (8 MHz vs. 4 MHz). Input bias current (25 pA) and input offset voltage (100 µV) are within acceptable tolerance of the TL084AID specifications. The extended operating temperature range (-40°C to 125°C) exceeds the TL084AID requirement. Supply voltage span (10V to 30V) requires verification for applications utilizing the full 6V minimum of the TL084AID. All variants are ROHS3 compliant with MSL 1 rating. Product status is active with substantial inventory availability (6,907 to 17,697 pieces depending on packaging).
ADA4000-4ARZ (Analog Devices Inc.)
The ADA4000-4ARZ provides a high-performance J-FET alternative with active product status and extended temperature rating (-40°C to 125°C). This device exceeds the TL084AID in slew rate (20V/µs) and matches the supply voltage span (8V to 36V minimum and maximum). Input bias current (5 pA) and input offset voltage (200 µV) represent superior specifications. Current supply (1.35 mA) is lower than the TL084AID, reducing power consumption. Output current per channel (28 mA) is lower than the TL084AID (40 mA), requiring verification for high-current output applications. ROHS3 compliance and MSL 1 rating are maintained. Inventory availability is 2,153 pieces.
AD8684ARZ / AD8684ARZ-REEL / AD8684ARZ-REEL7 (Analog Devices Inc.)
The AD8684 series offers a low-power J-FET alternative with active product status. All three packaging variants maintain identical electrical specifications. This device provides exceptional input bias current (6 pA) and low supply current (210 µA per 4 channels), making it suitable for battery-powered and low-power applications. However, the gain bandwidth product (3.5 MHz) is below the TL084AID specification (4 MHz), and slew rate (9V/µs) is reduced. Output current per channel (12 mA) is significantly lower than the TL084AID (40 mA), limiting applicability to high-current output circuits. Operating temperature range (-40°C to 85°C) does not extend to the TL084AID maximum of 105°C. Supply voltage span (9V to 36V) requires verification for 6V minimum applications. ROHS3 compliance and MSL 1 rating are maintained. Inventory availability ranges from 767 to 4,700 pieces depending on packaging.
Frequently Asked Questions (FAQ)
Q: Can the AD8513ARZ directly replace the TL084AID in all applications?
A: The AD8513ARZ meets all primary substitution criteria and provides superior electrical performance in slew rate and gain bandwidth product. However, the minimum supply voltage is 10V compared to the TL084AID minimum of 6V. Applications operating at 6V to 9V supply voltage require alternative selection or circuit redesign. The maximum supply voltage of the AD8513ARZ (30V) is lower than the TL084AID (36V), requiring verification for high-voltage applications.
Q: What is the primary difference between the three AD8513 packaging options?
A: The AD8513ARZ, AD8513ARZ-REEL, and AD8513ARZ-REEL7 are electrically identical. The differences are packaging and delivery format: Tube packaging for manual handling, Tape & Reel (TR) for standard automated assembly, and Cut Tape & Digi-Reel for flexible quantity requirements. Selection depends on manufacturing process and inventory management requirements.
Q: Is the ADA4000-4ARZ suitable for high-current output applications?
A: The ADA4000-4ARZ provides 28 mA output current per channel, compared to the TL084AID specification of 40 mA. Applications requiring the full 40 mA output current per channel should not use the ADA4000-4ARZ without circuit analysis to confirm adequate current margin.
Q: Why does the AD8684 series have lower performance specifications than the TL084AID?
A: The AD8684 series is optimized for ultra-low power consumption (210 µA total supply current) at the expense of reduced slew rate (9V/µs) and gain bandwidth product (3.5 MHz). This device is suitable for battery-powered and energy-constrained applications where the TL084AID performance specifications exceed application requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. The TL084AID and all listed substitute parts (AD8513ARZ series, AD8684ARZ series, and ADA4000-4ARZ) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are suitable for lead-free assembly processes.
Q: What is the operating temperature consideration when selecting a substitute?
A: The TL084AID operates to 105°C maximum. The AD8513ARZ and ADA4000-4ARZ extend to 125°C, providing additional thermal margin. The AD8684ARZ series is limited to 85°C maximum, which is below the TL084AID specification. Applications requiring operation above 85°C must not use the AD8684 series.
Q: Can the 14-SOIC package be used interchangeably across all substitute parts?
A: Yes. All substitute parts use the 14-SOIC (0.154", 3.90mm Width) surface mount package, which is mechanically and electrically compatible with the TL084AID. PCB layout and assembly processes require no modification for package compatibility.
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