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TL081ID Equivalent & Substitute Parts
Part Overview
The TL081ID is a J-FET input operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, though 2923 pieces remain available in new original stock. The TL081ID serves as a general-purpose JFET amplifier suitable for applications requiring low input bias current and wide supply voltage range operation.
Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and procurement flexibility. Active alternatives with compatible electrical and mechanical specifications are available from both Texas Instruments and alternative manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | J-FET | — |
| Number of Circuits | 1 | — |
| Slew Rate | 13 | V/µs |
| Gain Bandwidth Product | 3 | MHz |
| Current - Input Bias | 30 | pA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply | 1.4 | mA |
| Voltage - Supply Span (Min) | 7 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | −40 to 85 | °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 TL081ID is determined by strict equivalence across the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: J-FET
- Number of Circuits: 1
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Input Bias Current: 30 pA
- Voltage - Input Offset: 3 mV
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Secondary Compatibility Parameters:
- Slew Rate: 13 V/µs or greater
- Gain Bandwidth Product: 3 MHz or greater
- Current - Supply: 1.4 mA or less
- Voltage - Supply Span: minimum 7 V, maximum 36 V
- Operating Temperature: must encompass −40°C to 85°C or broader range
Substitute parts are grouped into two categories based on electrical performance alignment:
Category A - Direct Equivalents (Identical Electrical Specifications): Parts maintaining all primary specifications with identical slew rate and gain bandwidth product.
Category B - Enhanced Performance Alternatives (Superior Electrical Specifications): Parts exceeding primary specifications in slew rate and/or gain bandwidth product while maintaining compatibility across all other critical parameters.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Current - Input Bias (pA) | Voltage - Input Offset (mV) | Current - Supply (mA) | Voltage - Supply Span Min (V) | Voltage - Supply Span Max (V) | Operating Temperature (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TL081ID | Texas Instruments | Obsolete | 13 | 3 | 30 | 3 | 1.4 | 7 | 36 | −40 to 85 | 8-SOIC |
| TL081IDR | Texas Instruments | Active | 13 | 3 | 30 | 3 | 1.4 | 7 | 36 | −40 to 85 | 8-SOIC |
| TL081CDT | STMicroelectronics | Active | 16 | 4 | 20 | 3 | 1.4 | 6 | 36 | 0 to 70 | 8-SOIC |
| TL081IDT | STMicroelectronics | Active | 16 | 4 | 20 | 3 | 1.4 | 6 | 36 | −40 to 105 | 8-SOIC |
| TL071CDT | STMicroelectronics | Active | 16 | 4 | 20 | 3 | 1.4 | 6 | 36 | 0 to 70 | 8-SOIC |
| LF356M/NOPB | Texas Instruments | Active | 12 | 5 | 30 | 3 | 5 | 30 | 30 | 0 to 70 | 8-SOIC |
| LF356MX/NOPB | Texas Instruments | Active | 12 | 5 | 30 | 3 | 5 | 30 | 30 | 0 to 70 | 8-SOIC |
Engineering Selection Recommendations
Primary Recommendation: TL081IDR
The TL081IDR is the direct active equivalent of the TL081ID. This part maintains identical electrical specifications across all parameters while offering active product status. The TL081IDR is manufactured by Texas Instruments under the same base product number (TL081) and is available in Cut Tape and Digi-Reel packaging with 3700 pieces in stock. This part is ROHS3 compliant and carries identical compliance certifications. Selection of TL081IDR eliminates all substitution concerns and provides the highest design continuity.
Secondary Recommendation: TL081IDT
The TL081IDT, manufactured by STMicroelectronics, provides enhanced performance characteristics with superior slew rate (16 V/µs versus 13 V/µs) and higher gain bandwidth product (4 MHz versus 3 MHz). This part extends the operating temperature range to −40°C to 105°C, providing broader thermal coverage than the original TL081ID. The TL081IDT is ROHS3 compliant and maintains the same supply voltage range. This part is suitable for applications requiring extended temperature operation or improved frequency response.
Tertiary Recommendation: TL081CDT
The TL081CDT, also from STMicroelectronics, offers identical performance enhancements to the TL081IDT but with a restricted operating temperature range of 0°C to 70°C. This part is appropriate for applications operating within standard industrial temperature limits. The TL081CDT is available in Cut Tape packaging with 6375 pieces in stock.
Alternative Consideration: LF356MX/NOPB
The LF356MX/NOPB represents an enhanced alternative from the BI-FET series with superior gain bandwidth product (5 MHz) and slew rate performance (12 V/µs). However, this part operates at fixed ±15 V supply voltage (30 V span total) and exhibits higher supply current (5 mA versus 1.4 mA). The LF356MX/NOPB is suitable only for applications with fixed dual-supply architecture and where the increased power consumption is acceptable. This part is available in Cut Tape and Digi-Reel packaging with 90234 pieces in stock.
Not Recommended: LF356M/NOPB
The LF356M/NOPB exhibits identical electrical specifications to the LF356MX/NOPB but is packaged in Tube format. For new designs, the LF356MX/NOPB variant is preferred due to superior packaging availability and handling characteristics.
Frequently Asked Questions (FAQ)
Q: Can the TL081IDR be used as a direct replacement for the TL081ID?
A: Yes. The TL081IDR is electrically and mechanically identical to the TL081ID. Both parts share the same base product number (TL081), identical electrical specifications, and 8-SOIC package. The primary difference is product status: TL081IDR is active while TL081ID is obsolete. The TL081IDR is the recommended direct replacement.
Q: What is the difference between TL081IDT and TL081CDT?
A: Both parts are manufactured by STMicroelectronics and share identical electrical specifications. The primary difference is operating temperature range: TL081IDT operates from −40°C to 105°C, while TL081CDT operates from 0°C to 70°C. Selection depends on the application's thermal requirements. For extended temperature operation, TL081IDT is appropriate.
Q: Why do the STMicroelectronics TL081 variants show different electrical specifications than the Texas Instruments TL081ID?
A: The STMicroelectronics TL081CDT and TL081IDT variants exhibit enhanced performance characteristics: slew rate of 16 V/µs (versus 13 V/µs), gain bandwidth product of 4 MHz (versus 3 MHz), and lower input bias current of 20 pA (versus 30 pA). These represent performance improvements while maintaining functional compatibility. The minimum supply voltage is also reduced to 6 V. These enhancements make the STMicroelectronics variants suitable for applications requiring improved frequency response or lower input bias current.
Q: Are the LF356 series parts compatible with the TL081ID?
A: The LF356M/NOPB and LF356MX/NOPB parts are mechanically compatible (8-SOIC package) and share identical input bias current and input offset voltage specifications. However, these parts operate at fixed ±15 V supply voltage (30 V total span) and consume higher supply current (5 mA versus 1.4 mA). The LF356 series is suitable only for applications with fixed dual-supply architecture. Applications requiring the TL081ID's wide supply voltage range (7 V to 36 V) cannot use LF356 variants.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Cut Tape (CT), Cut Tape with Digi-Reel, Tape & Reel (TR), and Tube. The TL081IDR is available in Cut Tape and Digi-Reel formats. The TL081CDT is available in Cut Tape. The TL081IDT is available in Tape & Reel. The LF356MX/NOPB is available in Cut Tape and Digi-Reel. The LF356M/NOPB is available in Tube. Selection of packaging format depends on manufacturing process requirements and volume considerations.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts carry identical REACH and ECCN classifications as the original TL081ID.
Q: Which substitute part offers the best performance improvement?
A: The LF356MX/NOPB offers the highest gain bandwidth product (5 MHz) and represents the most significant performance enhancement. However, this part requires fixed ±15 V supply voltage operation and exhibits higher power consumption. For applications requiring improved performance within the original supply voltage range, the STMicroelectronics TL081IDT offers superior slew rate (16 V/µs) and gain bandwidth product (4 MHz) while maintaining the wide supply voltage capability.
Q: Can I use TL081IDT in applications requiring −40°C operation?
A: Yes. The TL081IDT operates from −40°C to 105°C, which encompasses the original TL081ID operating range of −40°C to 85°C. The TL081IDT is suitable for all temperature ranges required by the TL081ID, plus extended high-temperature operation to 105°C.
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