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TL082ACDG4 Equivalent & Substitute Parts
Part Overview
The TL082ACDG4 is a J-FET input operational amplifier featuring two independent circuits in an 8-SOIC surface mount package. Manufactured by Texas Instruments, this device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The TL082ACDG4 operates across a supply voltage range of 10V to 30V with a slew rate of 13V/µs and gain bandwidth product of 3 MHz, making it suitable for general-purpose amplification applications requiring low input bias current characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 2 | — |
| Slew Rate | 13 | V/µs |
| Gain Bandwidth Product | 3 | MHz |
| Current - Input Bias | 30 | pA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply | 1.4 (x2 Channels) | 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 | 8-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 TL082ACDG4 is determined by compatibility across the following critical parameters: amplifier type (J-FET input architecture), number of circuits (dual configuration), package form factor (8-SOIC), mounting technology (surface mount), and electrical operating ranges (supply voltage span, slew rate, gain bandwidth product, input bias current, and output current capability).
Substitute parts are grouped into two categories:
Category 1: Direct J-FET Equivalents — Parts maintaining J-FET input topology with matching or superior electrical performance within the 8-SOIC package. These include TL082ACDR, TL082BCD, TL082CMX/NOPB, and TL082ACD. These parts preserve the core J-FET architecture and are suitable for direct replacement in applications requiring low input bias current.
Category 2: Alternative Amplifier Topologies — Parts with different amplifier types (General Purpose, Audio) that operate within compatible supply voltage ranges and package specifications. These include MC33172D, MC33172DT, MC33172VDR2G, MC34072VDR2G, LM833DT, and AD8512ARZ. These substitutes offer enhanced performance characteristics in specific parameters but differ in amplifier topology or operating temperature ranges.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (mV) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| TL082ACDG4 | Texas Instruments | J-FET | 13 | 3 | 30 | 3 | 10 | 30 | 0 to 70 | Obsolete |
| TL082ACD | STMicroelectronics | J-FET | 16 | 3 | 20 | 3 | 6 | 36 | 0 to 70 | Obsolete |
| TL082ACDR | Texas Instruments | J-FET | 13 | 3 | 30 | 3 | 10 | 30 | 0 to 70 | Active |
| TL082BCD | Texas Instruments | J-FET | 13 | 3 | 30 | 2 | 10 | 30 | 0 to 70 | Obsolete |
| TL082CMX/NOPB | Texas Instruments | J-FET | 13 | 4 | 50 | 5 | 36 | 36 | 0 to 70 | Active |
| AD8512ARZ | Analog Devices Inc. | J-FET | 20 | 8 | 25 | 0.1 | 10 | 30 | -40 to 125 | Active |
| MC33172D | STMicroelectronics | General Purpose | 2 | 2.1 | 20000 | 1 | 4 | 44 | -40 to 105 | Active |
| MC33172DT | STMicroelectronics | General Purpose | 2 | 2.1 | 20000 | 1 | 4 | 44 | -40 to 105 | Active |
| MC33172VDR2G | onsemi | General Purpose | 2.1 | 1.8 | 20000 | 2 | 3 | 44 | -40 to 125 | Active |
| MC34072VDR2G | onsemi | General Purpose | 13 | 4.5 | 100000 | 1 | 3 | 44 | -40 to 125 | Active |
| LM833DT | STMicroelectronics | Audio | 7 | 15 | 300000 | 0.3 | 5 | 30 | -40 to 105 | Active |
Engineering Selection Recommendations
Primary Recommendation: TL082ACDR
The TL082ACDR is the preferred substitute for the obsolete TL082ACDG4. Both devices are manufactured by Texas Instruments and share identical electrical specifications: J-FET amplifier topology, 13V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, and 3 mV input offset voltage. The TL082ACDR maintains the same supply voltage range (10V to 30V) and operating temperature span (0°C to 70°C). The critical distinction is product status: TL082ACDR is active and available in production quantities, whereas TL082ACDG4 is obsolete. Both devices are ROHS3 compliant with MSL 1 rating and identical package specifications (8-SOIC, 0.154" width, 3.90mm).
Secondary Recommendation: TL082ACD
The TL082ACD, manufactured by STMicroelectronics, provides a J-FET equivalent with enhanced performance characteristics. It features a higher slew rate (16V/µs versus 13V/µs) and lower input bias current (20 pA versus 30 pA). The supply voltage range is expanded (6V to 36V minimum and maximum respectively, compared to 10V to 30V). The TL082ACD is classified as obsolete but maintains full J-FET topology compatibility. This part is suitable for applications where the expanded supply voltage range and improved slew rate provide design advantages.
Performance-Enhanced Alternative: AD8512ARZ
The AD8512ARZ, manufactured by Analog Devices Inc., represents a performance-enhanced J-FET alternative. It delivers superior specifications: 20V/µs slew rate (versus 13V/µs), 8 MHz gain bandwidth product (versus 3 MHz), and significantly lower input offset voltage (100 µV versus 3 mV). The AD8512ARZ extends the operating temperature range to -40°C to 125°C and provides 70 mA output current per channel (versus 10 mA). This device is active and suitable for applications requiring higher bandwidth and precision offset characteristics while maintaining J-FET input architecture.
General Purpose Alternatives: MC33172 Series
The MC33172D, MC33172DT, and MC33172VDR2G represent general-purpose amplifier alternatives with active product status. These devices operate across wider supply voltage ranges (3V to 44V or 4V to 44V) and extended temperature ranges (-40°C to 105°C or -40°C to 125°C). However, they employ general-purpose amplifier topology rather than J-FET input, resulting in significantly higher input bias current (20 nA versus 30 pA) and lower slew rate (2V/µs to 2.1V/µs versus 13V/µs). These substitutes are appropriate for applications where J-FET input characteristics are not critical and where the expanded operating ranges provide system-level advantages.
Extended Range Alternative: MC34072VDR2G
The MC34072VDR2G, manufactured by onsemi, offers general-purpose amplification with slew rate matching the original device (13V/µs) and enhanced gain bandwidth product (4.5 MHz). It operates across 3V to 44V supply range and -40°C to 125°C temperature span. Input bias current is substantially higher (100 nA versus 30 pA), making this substitute suitable for applications where J-FET input precision is not required but where extended operating ranges are beneficial.
Audio Application Alternative: LM833DT
The LM833DT, manufactured by STMicroelectronics, is an audio amplifier topology with active status. It provides 15 MHz gain bandwidth product and operates across 5V to 30V supply range with -40°C to 105°C temperature span. This device is suitable for audio-specific applications where the higher bandwidth and audio-optimized characteristics provide performance advantages, despite higher input bias current (300 nA) and lower slew rate (7V/µs).
All recommended substitutes maintain 8-SOIC package compatibility, surface mount mounting technology, ROHS3 compliance, and MSL 1 moisture sensitivity rating.
Frequently Asked Questions (FAQ)
Q: Can TL082ACDR be used as a direct replacement for TL082ACDG4?
A: Yes. The TL082ACDR is a direct replacement. Both devices share identical electrical specifications, J-FET input topology, 8-SOIC package form factor, and operating temperature range (0°C to 70°C). The primary difference is product status: TL082ACDR is active and available in production quantities, while TL082ACDG4 is obsolete. No circuit modifications are required for substitution.
Q: What is the difference between J-FET and general-purpose amplifier topologies?
A: J-FET input amplifiers feature extremely low input bias current (typically in the picoampere range, as demonstrated by the TL082ACDG4 at 30 pA). General-purpose amplifiers employ bipolar input stages with significantly higher input bias current (typically in the nanoampere range). For applications requiring high input impedance or where input bias current must be minimized, J-FET topology is essential. For general-purpose applications where input bias current is not a limiting factor, general-purpose amplifiers provide acceptable performance.
Q: Is the TL082ACD suitable for applications requiring the original 10V to 30V supply range?
A: Yes. The TL082ACD supports a supply voltage range of 6V to 36V, which encompasses the original 10V to 30V specification. The expanded range provides additional design flexibility. However, the TL082ACD is classified as obsolete, making TL082ACDR the preferred active alternative.
Q: What are the implications of higher input bias current in substitute parts?
A: Higher input bias current increases the voltage offset at high-impedance input sources. For example, MC33172 series devices exhibit 20 nanoamperes input bias current compared to 30 picoamperes in the TL082ACDG4. This 667-fold increase may introduce unacceptable offset in applications with source impedances exceeding several megohms. Applications with source impedances below 100 kilohms typically tolerate this difference without circuit modification.
Q: Can AD8512ARZ be used in applications designed for TL082ACDG4?
A: AD8512ARZ is compatible with TL082ACDG4 applications from a package and supply voltage perspective. However, the superior performance characteristics (higher slew rate, wider bandwidth, lower offset voltage) may require circuit re-evaluation. The extended operating temperature range (-40°C to 125°C versus 0°C to 70°C) provides additional capability. Substitution is appropriate for applications where enhanced performance is beneficial or where the extended temperature range is required.
Q: What packaging considerations apply to these substitutes?
A: All recommended substitutes employ 8-SOIC surface mount packaging with identical physical dimensions (0.154" width, 3.90mm). Pin configurations are identical across all J-FET alternatives (TL082ACDG4, TL082ACDR, TL082ACD, AD8512ARZ). General-purpose and audio alternatives (MC33172 series, LM833DT) also maintain 8-SOIC pin compatibility. Direct PCB substitution is possible without layout modification.
Q: Are there compliance or certification differences between substitutes?
A: All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original TL082ACDG4. The TL082ACD carries AEC-Q100 automotive qualification, providing additional reliability assurance for automotive applications. This certification is not present in other substitutes. Selection should consider application-specific compliance requirements.
Q: What is the significance of "Active" versus "Obsolete" product status?
A: Active products are in current production with guaranteed long-term availability and supply continuity. Obsolete products are no longer manufactured and available only from existing inventory. For new designs or production continuity, active products (TL082ACDR, AD8512ARZ, MC33172 series, LM833DT) are strongly preferred. Obsolete products (TL082ACDG4, TL082ACD, TL082BCD) should be replaced in ongoing production to ensure supply security.
Q: How does gain bandwidth product affect circuit performance?
A: Gain bandwidth product (GBW) defines the maximum bandwidth available at a given closed-loop gain. The TL082ACDG4 provides 3 MHz GBW. At unity gain, maximum bandwidth is 3 MHz. At 10x gain, maximum bandwidth is 300 kHz. Higher GBW alternatives (AD8512ARZ at 8 MHz, LM833DT at 15 MHz) provide proportionally greater bandwidth at equivalent gains. Selection depends on required signal bandwidth and closed-loop gain configuration.
Q: What output current capability differences exist among substitutes?
A: The TL082ACDG4 provides 10 mA output current per channel. AD8512ARZ delivers 70 mA per channel, providing 7x greater drive capability. MC33172 series devices provide 27 mA per channel. LM833DT provides 37 mA per channel. Applications requiring direct drive of low-impedance loads benefit from higher output current capability. Applications with high-impedance loads or buffered outputs tolerate lower output current specifications.
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