TL081CD Equivalent & Substitute Parts

Part Overview

The TL081CD 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 4,748 units remain in stock. The TL081CD serves as a general-purpose J-FET amplifier suitable for applications requiring low input bias current and moderate bandwidth performance.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain planning, and new production implementations. Active alternatives with compatible electrical and mechanical specifications are available from both Texas Instruments and alternative manufacturers.

Substiute Parts

TL081CD

Texas InstrumentsIn Stock: 4818TL081CD Datasheet

Current PartRFQ

TL081CDR

Texas InstrumentsIn Stock: 1964TL081CDR Datasheet

MFR RecommendedRFQ

LF356M/NOPB

Texas InstrumentsIn Stock: 30931LF356M/NOPB Datasheet

MFR RecommendedRFQ

LF356MX/NOPB

Texas InstrumentsIn Stock: 90330LF356MX/NOPB Datasheet

MFR RecommendedRFQ

MC33171DT

STMicroelectronicsIn Stock: 5453MC33171DT Datasheet

MFR RecommendedRFQ

TL071CDT

STMicroelectronicsIn Stock: 6471TL071CDT Datasheet

MFR RecommendedRFQ

TL081CDT

STMicroelectronicsIn Stock: 3681TL081CDT Datasheet

MFR RecommendedRFQ

TL081IDT

STMicroelectronicsIn Stock: 2003TL081IDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL081CD is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: J-FET input configuration
• Number of Circuits: Single circuit per package
• Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Voltage Supply Range: Minimum 7V to maximum 36V capability
• Operating Temperature Range: 0°C to 70°C minimum
• RoHS3 Compliance and MSL Level 1 rating

Secondary Performance Parameters:

• Slew Rate: 13 V/µs or greater
• Gain Bandwidth Product: 3 MHz or greater
• Current - Input Bias: 30 pA or lower
• Voltage - Input Offset: 3 mV or lower
• Current - Supply: 1.4 mA or lower

Substitute parts are grouped into two categories: direct equivalents maintaining identical electrical specifications, and functional alternatives offering enhanced performance characteristics while maintaining backward compatibility within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for Obsolete Part Replacement):

TL081CDR is the primary substitute for TL081CD. Both devices are manufactured by Texas Instruments and maintain identical electrical specifications across all critical parameters: 13 V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, and 1.4 mA supply current. The TL081CDR is actively produced and available in higher quantities (1,900 units in stock). The only difference is packaging format: TL081CDR is supplied in Cut Tape (CT) & Digi-Reel® format versus the TL081CD's tube packaging. Both meet ROHS3 compliance and MSL Level 1 requirements.

Enhanced Performance Alternatives:

TL071CDT and TL081CDT (STMicroelectronics) offer improved slew rate (16 V/µs) and gain bandwidth product (4 MHz) while maintaining J-FET input architecture and 1.4 mA supply current. These devices support the full 6V to 36V supply range and are actively produced. TL081IDT extends the operating temperature range to -40°C to 105°C, suitable for industrial applications.

LF356M/NOPB and LF356MX/NOPB (Texas Instruments BI-FET™ series) provide superior gain bandwidth product (5 MHz) and lower input bias current (30 pA). However, these devices require a fixed 30V supply voltage and consume 5 mA supply current, making them suitable only for applications with dedicated 30V rails.

Limited Compatibility:

MC33171DT (STMicroelectronics) is a general-purpose amplifier with significantly reduced slew rate (2 V/µs) and gain bandwidth product (2.1 MHz). This device is not recommended as a direct substitute due to inferior dynamic performance characteristics, though it offers extended temperature range (-40°C to 105°C) and lower supply current (220 µA).

Compliance and Availability:

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status. Selection should prioritize active production status and inventory availability for long-term supply chain security.

Frequently Asked Questions (FAQ)

Q: Can TL081CDR directly replace TL081CD in existing designs?

A: Yes. TL081CDR is electrically and functionally identical to TL081CD. Both devices share the same electrical specifications, supply voltage range (7V to 36V), operating temperature range (0°C to 70°C), and 8-SOIC package footprint. The only difference is packaging format: TL081CDR uses Cut Tape & Digi-Reel® format while TL081CD uses tube packaging. No circuit modifications are required.

Q: What is the primary reason to substitute TL081CD?

A: TL081CD is classified as obsolete. While inventory remains available, long-term supply cannot be guaranteed. TL081CDR, produced by the same manufacturer with identical specifications, is actively manufactured and recommended for new designs and production continuity.

Q: Are LF356M/NOPB and LF356MX/NOPB suitable replacements?

A: LF356M/NOPB and LF356MX/NOPB are functionally compatible in terms of package, pin configuration, and J-FET input architecture. However, these devices require a fixed 30V supply voltage, whereas TL081CD operates across 7V to 36V. Additionally, LF356 series devices consume 5 mA supply current compared to TL081CD's 1.4 mA. Substitution is only appropriate for designs with dedicated 30V power supplies and where increased power consumption is acceptable.

Q: What are the performance differences between TL081CD and TL071CDT?

A: TL071CDT offers enhanced performance: slew rate of 16 V/µs (versus 13 V/µs) and gain bandwidth product of 4 MHz (versus 3 MHz). Both maintain J-FET input architecture, 1.4 mA supply current, and 8-SOIC packaging. TL071CDT is suitable for applications requiring faster signal response. Both support 6V to 36V supply range, though TL081CD specifies 7V minimum.

Q: Can MC33171DT replace TL081CD?

A: MC33171DT is not recommended as a direct substitute. While both are single-circuit 8-SOIC operational amplifiers with ROHS3 compliance, MC33171DT is a general-purpose amplifier with significantly reduced performance: 2 V/µs slew rate (versus 13 V/µs) and 2.1 MHz gain bandwidth product (versus 3 MHz). MC33171DT is suitable only for low-speed applications where J-FET input characteristics are not required.

Q: What is the difference between TL081CDT and TL081IDT?

A: Both devices are manufactured by STMicroelectronics with identical electrical specifications and 8-SOIC packaging. The primary difference is operating temperature range: TL081CDT operates 0°C to 70°C, while TL081IDT operates -40°C to 105°C. TL081IDT is specified for industrial and extended-temperature applications. Packaging format also differs: TL081CDT uses Cut Tape format, while TL081IDT uses Tape & Reel format.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—TL081CDR, LF356M/NOPB, LF356MX/NOPB, MC33171DT, TL071CDT, TL081CDT, and TL081IDT—are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. All are REACH unaffected.

Q: Which substitute offers the best supply availability?

A: LF356MX/NOPB has the highest inventory level at 90,234 units in stock. LF356M/NOPB follows with 30,916 units. For direct TL081CD equivalents, TL081CDR has 1,900 units available. Inventory levels should be verified with suppliers for current availability.

Q: Can I use TL081IDT in a 0°C to 70°C application?

A: Yes. TL081IDT is rated for -40°C to 105°C operation, which encompasses the 0°C to 70°C range. The device will function correctly within this narrower temperature band. However, TL081CDT or TL081CDR may be more cost-effective for applications not requiring extended temperature performance.