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TL081ACD Equivalent & Substitute Parts
Part Overview
The TL081ACD is a J-FET input operational amplifier manufactured by STMicroelectronics in an 8-SOIC surface mount package. This single-circuit amplifier is designed for general-purpose analog signal processing applications requiring low input bias current and high input impedance characteristics inherent to J-FET technology.
The TL081ACD is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this amplifier topology.
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 | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the TL081ACD is determined by the following critical parameters:
Electrical Compatibility Criteria:
- Amplifier Type: J-FET input configuration
- Number of Circuits: Single operational amplifier
- Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width
- Mounting Type: Surface mount technology
- Operating Temperature Range: Minimum 0°C to 70°C coverage
- Supply Voltage Range: Minimum 6V to 36V span coverage
Performance Parameters:
- Slew Rate: 13 V/µs or greater
- Gain Bandwidth Product: 3 MHz or greater
- Current - Input Bias: 65 pA or lower
- Voltage - Input Offset: 3 mV or lower
- Current - Supply: 5 mA or lower
- Current - Output / Channel: 40 mA or greater
Compliance Requirements:
- RoHS3 Compliant status preferred for new designs
- REACH Unaffected status preferred
Substitute parts meeting these criteria maintain functional equivalence while accommodating variations in manufacturing source, product status, and packaging options.
Parameter Comparison
| Parameter | TL081ACD (STMicroelectronics) | LF356M/NOPB (Texas Instruments) | LF356MX/NOPB (Texas Instruments) | TL071CD (onsemi) | TL071CDR (Texas Instruments) | TL071CPSR (Texas Instruments) | TL071ID (STMicroelectronics) | TL071IDR (Texas Instruments) | TL081ACD (onsemi) | TL081ACDR (Texas Instruments) | TL081BCD (Texas Instruments) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Amplifier Type | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET | J-FET |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 16 | 12 | 12 | 16 | 13 | 13 | 16 | 13 | 16 | 13 | 13 |
| Gain Bandwidth Product (MHz) | 4 | 5 | 5 | 5.25 | 5.25 | 3 | 4 | 5.25 | 4 | 3 | 3 |
| Current - Input Bias (pA) | 20 | 30 | 30 | 20 | 65 | 65 | 20 | 65 | 20 | 30 | 30 |
| Voltage - Input Offset (mV) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 |
| Current - Supply (mA) | 1.4 | 5 | 5 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 |
| Current - Output / Channel (mA) | 40 | — | — | 40 | — | — | 40 | — | 40 | — | — |
| Voltage - Supply Span Min (V) | 6 | 30 | 30 | 6 | 10 | 10 | 6 | 10 | 6 | 7 | 7 |
| Voltage - Supply Span Max (V) | 36 | 30 | 30 | 36 | 30 | 30 | 36 | 30 | 36 | 36 | 36 |
| Operating Temperature (°C) | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | -40 to 105 | -40 to 85 | 0 to 70 | 0 to 70 | 0 to 70 |
| Package / Case | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.209", 5.30mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Obsolete | Active | Last Time Buy | Obsolete | Active | Obsolete | Active | Obsolete |
Engineering Selection Recommendations
Primary Substitute (Highest Compatibility):
The TL081ACDR (Texas Instruments) is the recommended primary substitute for the TL081ACD. This part maintains identical electrical specifications including slew rate (13 V/µs minimum), gain bandwidth product (3 MHz), input bias current (30 pA), and supply voltage range (7V to 36V). The TL081ACDR is ROHS3 compliant, carries Active product status ensuring long-term availability, and is supplied in Cut Tape (CT) & Digi-Reel® packaging. The 8-SOIC package footprint is identical to the original part.
Secondary Substitutes (Functional Equivalence with Parameter Variations):
The TL071IDR (Texas Instruments) provides functional equivalence with enhanced performance characteristics. It offers superior gain bandwidth product (5.25 MHz) and slew rate (13 V/µs), though input bias current is elevated to 65 pA. Operating temperature range extends to -40°C to 85°C. This part is ROHS3 compliant and carries Active product status. The 8-SOIC package footprint matches the original specification.
The LF356MX/NOPB (Texas Instruments) represents an alternative J-FET amplifier with 5 MHz gain bandwidth product and 12 V/µs slew rate. Input bias current is 30 pA. Supply voltage range is fixed at 30V. This part is ROHS3 compliant, Active status, and supplied in Cut Tape (CT) & Digi-Reel® packaging with identical 8-SOIC footprint.
Compliance Considerations:
Parts with RoHS non-compliant status (TL071CD from onsemi and TL081ACD from onsemi) are suitable only for applications where RoHS compliance is not required. For new designs and regulated applications, ROHS3 compliant alternatives are mandatory.
Product Status Impact:
Active status parts (TL081ACDR, TL071IDR, LF356MX/NOPB, TL071CDR) ensure continued availability and manufacturing support. Obsolete status parts should be considered only for legacy system maintenance where supply chain has been secured.
Frequently Asked Questions (FAQ)
Q: Can the TL081ACDR directly replace the TL081ACD without circuit modification?
A: The TL081ACDR is a direct pin-compatible substitute with identical package footprint (8-SOIC, 0.154" width). Electrical specifications are compatible within the design envelope of the original circuit. No circuit modification is required for standard applications.
Q: What is the primary difference between TL081ACDR and TL071IDR substitutes?
A: The TL081ACDR maintains the original TL081 series specifications with 3 MHz gain bandwidth product and 13 V/µs slew rate. The TL071IDR offers enhanced performance with 5.25 MHz gain bandwidth product but exhibits higher input bias current (65 pA versus 30 pA). Selection depends on whether the application requires the lower input bias current of the TL081 series or benefits from the higher bandwidth of the TL071 series.
Q: Is the LF356MX/NOPB suitable for applications requiring the full 6V to 36V supply range of the original TL081ACD?
A: No. The LF356MX/NOPB operates at a fixed 30V supply voltage and does not support the 6V minimum supply voltage of the TL081ACD. This substitute is suitable only for applications operating at or near 30V supply voltage.
Q: Why is the TL071CPSR listed as a substitute despite having a different package width (0.209" versus 0.154")?
A: The TL071CPSR is functionally equivalent in electrical specifications but uses an 8-SO package with 0.209" width instead of the standard 0.154" width. This part is suitable only if the PCB layout can accommodate the wider package footprint. Verification of physical compatibility is required before selection.
Q: What is the significance of "Last Time Buy" status for the TL071CPSR?
A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. Existing inventory is available for purchase, but no future production is planned. This part should be selected only for immediate requirements or legacy system support where supply has been secured.
Q: Are there supply voltage range limitations when substituting with TL071 series parts?
A: Yes. TL071 series parts (TL071CDR, TL071IDR, TL071CPSR) operate with minimum supply voltage of 10V, compared to the TL081ACD minimum of 6V. These substitutes are not suitable for applications requiring operation below 10V supply voltage.
Q: How does input bias current affect circuit performance in substitution?
A: Input bias current determines the magnitude of bias current flowing into the amplifier inputs. The TL081ACD and TL081ACDR specify 20-30 pA, while TL071 series parts specify 65 pA. Higher input bias current increases input offset voltage drift and may affect precision analog circuits. For low-bias-current applications, TL081 series substitutes are preferred over TL071 series.
Q: Is RoHS compliance mandatory for all substitute selections?
A: RoHS compliance is mandatory for applications subject to EU Directive 2011/65/EU or equivalent regional regulations. For applications without regulatory RoHS requirements, non-compliant parts may be used. However, ROHS3 compliant alternatives are recommended for all new designs to ensure future regulatory alignment.
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