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TL081ACDT Equivalent & Substitute Parts
Part Overview
The TL081ACDT is a J-FET input operational amplifier manufactured by STMicroelectronics in an 8-SOIC surface mount package. This single-circuit amplifier is designed for applications requiring low input bias current and high input impedance characteristics typical of J-FET input stages. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across critical electrical parameters including slew rate, gain bandwidth product, input bias current, and supply voltage specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 1 | — |
| Slew Rate | 16 | V/µs |
| Gain Bandwidth Product | 4 | MHz |
| Current - Input Bias | 20 | pA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply | 1.4 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 6 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the TL081ACDT is determined by compatibility across the following critical parameters:
Electrical Compatibility Criteria:
- Amplifier type must be J-FET input
- Single circuit configuration (1 circuit)
- Input bias current within acceptable range (20 pA baseline)
- Input offset voltage specification (3 mV)
- Supply current compatibility (1.4 mA baseline)
- Output current capability (40 mA per channel)
- Supply voltage range must encompass or match the 6V to 36V span
- Operating temperature range must support 0°C to 70°C minimum
Package Compatibility Criteria:
- Surface mount technology
- 8-SOIC package form factor with 0.154" (3.90mm) width standard
Performance Parameters:
- Slew rate of 16 V/µs represents the baseline performance
- Gain bandwidth product of 4 MHz represents the baseline performance
- Substitute parts with equal or superior slew rate and gain bandwidth product maintain functional equivalence
Substitute parts are grouped into two categories: direct equivalents (matching all critical parameters within tolerance) and functional alternatives (meeting electrical requirements with acceptable performance trade-offs).
Parameter Comparison
| Part Number | Manufacturer | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TL081ACDT | STMicroelectronics | 16 | 4 | 20 | 3 | 1.4 | 40 | 6 | 36 | 0 to 70 | 8-SOIC (3.90mm) | Obsolete |
| LF356M/NOPB | Texas Instruments | 12 | 5 | 30 | 3 | 5 | — | 30 | 30 | 0 to 70 | 8-SOIC (3.90mm) | Active |
| LF356MX/NOPB | Texas Instruments | 12 | 5 | 30 | 3 | 5 | — | 30 | 30 | 0 to 70 | 8-SOIC (3.90mm) | Active |
| TL071CD | onsemi | 16 | 5.25 | 20 | 3 | 1.4 | 40 | 6 | 36 | 0 to 70 | 8-SOIC (3.90mm) | Obsolete |
| TL071CDR | Texas Instruments | 13 | 5.25 | 65 | 3 | 1.4 | — | 10 | 30 | 0 to 70 | 8-SOIC (3.90mm) | Active |
| TL071CPSR | Texas Instruments | 13 | 3 | 65 | 3 | 1.4 | — | 10 | 30 | 0 to 70 | 8-SOIC (5.30mm) | Last Time Buy |
| TL071ID | STMicroelectronics | 16 | 4 | 20 | 3 | 1.4 | 40 | 6 | 36 | -40 to 105 | 8-SOIC (3.90mm) | Obsolete |
| TL071IDR | Texas Instruments | 13 | 5.25 | 65 | 3 | 1.4 | — | 10 | 30 | -40 to 85 | 8-SOIC (3.90mm) | Active |
| TL081ACD | onsemi | 16 | 4 | 20 | 3 | 1.4 | 40 | 6 | 36 | 0 to 70 | 8-SOIC (3.90mm) | Obsolete |
| TL081ACDR | Texas Instruments | 13 | 3 | 30 | 3 | 1.4 | — | 7 | 36 | 0 to 70 | 8-SOIC (3.90mm) | Active |
| TL081BCD | Texas Instruments | 13 | 3 | 30 | 2 | 1.4 | — | 7 | 36 | 0 to 70 | 8-SOIC (3.90mm) | Obsolete |
Engineering Selection Recommendations
Direct Equivalents (Highest Compatibility):
The TL081ACD (onsemi) provides the closest functional match to the TL081ACDT. Both parts share identical electrical specifications across slew rate (16 V/µs), gain bandwidth product (4 MHz), input bias current (20 pA), supply current (1.4 mA), output current (40 mA), and supply voltage range (6V to 36V). Both operate across the 0°C to 70°C temperature range and use the standard 8-SOIC (3.90mm) package. However, the TL081ACD is classified as obsolete, limiting its long-term availability.
The TL071CD (onsemi) offers superior gain bandwidth product (5.25 MHz) while maintaining identical slew rate (16 V/µs), input bias current (20 pA), supply current (1.4 mA), output current (40 mA), and supply voltage range (6V to 36V). This part is also obsolete but represents a performance upgrade within the same electrical envelope.
Active Product Alternatives:
The TL071IDR (Texas Instruments) is an active product offering gain bandwidth product of 5.25 MHz and slew rate of 13 V/µs. This part operates across an extended temperature range (-40°C to 85°C) and maintains the 1.4 mA supply current specification. The supply voltage range is restricted to 10V to 30V, which may limit applications requiring the full 6V to 36V span of the original part. RoHS3 compliance is provided.
The TL081ACDR (Texas Instruments) is an active product with gain bandwidth product of 3 MHz and slew rate of 13 V/µs. This part maintains the 1.4 mA supply current and supports the full 7V to 36V supply voltage range. RoHS3 compliance is provided. Input bias current is specified at 30 pA, representing a 50% increase over the original 20 pA specification.
Limited Compatibility Alternatives:
The LF356M/NOPB and LF356MX/NOPB (Texas Instruments) are active J-FET amplifiers with superior gain bandwidth product (5 MHz) but reduced slew rate (12 V/µs). These parts operate at 5 mA supply current, significantly higher than the 1.4 mA baseline. Supply voltage range is fixed at 30V, eliminating compatibility with applications requiring the 6V minimum of the original part. RoHS3 compliance is provided. These parts are suitable only for applications where the higher supply current and fixed 30V supply are acceptable.
The TL071CPSR (Texas Instruments) uses a larger 8-SOIC package (5.30mm width) and is classified as Last Time Buy, indicating imminent discontinuation. This part is not recommended for new designs.
Compliance Considerations:
The original TL081ACDT is RoHS non-compliant. Active substitute parts (TL071IDR, TL081ACDR, LF356M/NOPB, LF356MX/NOPB) provide RoHS3 compliance, supporting regulatory requirements for new applications. Obsolete substitute parts (TL071CD, TL081ACD, TL071ID, TL081BCD) maintain RoHS non-compliant status matching the original part.
Frequently Asked Questions (FAQ)
Q: Can the TL071IDR directly replace the TL081ACDT in all applications?
A: The TL071IDR provides functional substitution for most applications but with specific limitations. The supply voltage range is restricted to 10V to 30V, eliminating compatibility with circuits requiring the original 6V minimum supply. Input bias current is increased to 65 pA compared to the original 20 pA, which may affect precision analog circuits with high impedance inputs. Slew rate is reduced from 16 V/µs to 13 V/µs, potentially impacting high-speed signal processing applications. Gain bandwidth product is improved to 5.25 MHz. Substitution is valid only when the application operates within the 10V to 30V supply range and can tolerate the increased input bias current and reduced slew rate.
Q: What is the difference between TL081ACDR and TL081ACDT?
A: The TL081ACDR is the active product variant of the TL081ACDT series. Both share the same base part number (TL081A) and similar electrical characteristics. The TL081ACDR is manufactured by Texas Instruments and carries RoHS3 compliance, while the TL081ACDT is manufactured by STMicroelectronics and is RoHS non-compliant. The TL081ACDR has a gain bandwidth product of 3 MHz compared to 4 MHz for the TL081ACDT, and slew rate is reduced from 16 V/µs to 13 V/µs. Input bias current is increased to 30 pA. The TL081ACDR is actively produced and recommended for new designs requiring RoHS compliance.
Q: Are the LF356 series parts suitable replacements?
A: The LF356M/NOPB and LF356MX/NOPB are J-FET amplifiers with compatible package and pin configuration but significant electrical differences. Supply current is 5 mA compared to 1.4 mA for the TL081ACDT, representing a 3.6× increase in power consumption. Supply voltage is fixed at 30V, eliminating compatibility with applications requiring the 6V minimum of the original part. Slew rate is reduced to 12 V/µs. These parts are suitable only for applications where higher supply current is acceptable and the 30V fixed supply voltage is compatible with the circuit design. The LF356 series is recommended for new designs where power consumption is not a constraint.
Q: What package considerations apply to substitute parts?
A: All recommended substitute parts use the standard 8-SOIC surface mount package with 0.154" (3.90mm) width, maintaining direct pin-for-pin compatibility with the TL081ACDT. The exception is the TL071CPSR, which uses a larger 8-SOIC package with 0.209" (5.30mm) width. This larger package may require PCB layout modifications and is not recommended due to its Last Time Buy status. All other substitute parts maintain identical footprint compatibility and require no PCB redesign.
Q: Which substitute part offers the best performance upgrade?
A: The TL071CD and TL071IDR both offer improved gain bandwidth product (5.25 MHz) compared to the original 4 MHz specification. The TL071CD is obsolete but provides identical slew rate (16 V/µs) and electrical envelope. The TL071IDR is an active product with RoHS3 compliance but operates at reduced slew rate (13 V/µs) and restricted supply voltage range (10V to 30V). For applications requiring the full 6V to 36V supply range, the TL071CD provides the best performance upgrade. For new designs with RoHS compliance requirements and 10V to 30V supply availability, the TL071IDR is the recommended choice.
Q: Is the TL081ACD a viable long-term substitute?
A: The TL081ACD provides identical electrical specifications to the TL081ACDT and is the closest functional equivalent. However, both parts are classified as obsolete, indicating limited long-term availability. The TL081ACD is suitable for legacy system maintenance and repair applications where existing inventory is available. For new designs or applications requiring long-term supply assurance, active products such as the TL081ACDR or TL071IDR are recommended despite minor electrical trade-offs.
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