TL081IN Equivalent & Substitute Parts

Part Overview

The TL081IN is a J-FET input operational amplifier manufactured by STMicroelectronics, housed in an 8-DIP through-hole package. This device is classified as obsolete, though 732 pieces remain in stock as new original inventory. The TL081IN serves as a general-purpose JFET amplifier suitable for applications requiring low input bias current and wide supply voltage range. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and long-term availability assurance.

Substiute Parts

TL081IN

STMicroelectronicsIn Stock: 809TL081IN Datasheet

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LF356N/NOPB

Texas InstrumentsIn Stock: 17519LF356N/NOPB Datasheet

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TL071CP

Texas InstrumentsIn Stock: 22310TL071CP Datasheet

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TL071IP

Texas InstrumentsIn Stock: 1197TL071IP Datasheet

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TL081ACP

Texas InstrumentsIn Stock: 4337TL081ACP Datasheet

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TL081BCP

Texas InstrumentsIn Stock: 2204TL081BCP Datasheet

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TL081CP

Texas InstrumentsIn Stock: 88939TL081CP Datasheet

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TL081IP

Texas InstrumentsIn Stock: 2471TL081IP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL081IN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Amplifier Type: J-FET (required for functional equivalence)
• Number of Circuits: 1 (single amplifier per package)
• Package / Case: 8-DIP (0.300", 7.62mm) (mechanical compatibility)
• Mounting Type: Through Hole (board assembly compatibility)

Secondary Compatibility Parameters:

• Voltage - Supply Span (Min): must be ≤ 6V
• Voltage - Supply Span (Max): must be ≥ 36V
• Current - Input Bias: must be ≤ 20pA (lower is acceptable)
• Voltage - Input Offset: must be ≤ 3mV (lower is acceptable)
• Current - Supply: must be ≤ 1.4mA (lower is acceptable)
• Operating Temperature: must encompass or exceed -40°C to 105°C range

Substitute parts meeting all primary criteria and maintaining compatibility within secondary parameters are classified as direct equivalents. Parts with reduced operating temperature ranges or modified electrical specifications are classified as functional substitutes with application-specific limitations.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

The TL081CP, TL081ACP, TL081BCP, and TL081IP represent the closest functional equivalents to the TL081IN. All are manufactured by Texas Instruments, maintain J-FET amplifier architecture with single circuit configuration, and are housed in identical 8-DIP through-hole packages. These parts are all ROHS3 compliant and REACH unaffected, matching the regulatory status of the main part.

TL081CP and TL081IP are preferred for applications requiring the full supply voltage range (7V to 36V) and are available in high inventory quantities (88,892 and 2,448 pieces respectively). TL081IP extends the operating temperature range to -40°C to 85°C, providing enhanced low-temperature performance compared to the commercial-grade TL081CP (0°C to 70°C).

TL081ACP and TL081BCP maintain identical supply voltage specifications and are suitable for applications with relaxed temperature requirements (0°C to 70°C). TL081BCP offers marginally improved input offset voltage specification (2mV versus 3mV).

Functional Substitutes (Application-Dependent):

TL071CP and TL071IP are functional substitutes with modified electrical characteristics. Both feature higher gain bandwidth product (5.25MHz versus 3MHz to 4MHz) and reduced slew rate (13V/µs versus 16V/µs). The minimum supply voltage requirement increases to 10V, restricting use in applications requiring 6V to 9V operation. TL071IP provides extended operating temperature range (-40°C to 85°C) suitable for industrial applications.

LF356N/NOPB (BI-FET™ series) is a functional substitute with significant electrical differences. Supply current increases to 5mA (versus 1.4mA), and minimum supply voltage requirement is 30V, eliminating compatibility with lower voltage applications. Input bias current specification is 30pA (versus 20pA). This part is suitable only for applications with 30V fixed supply voltage and higher power budget tolerance.

Product Status Consideration:

All substitute parts maintain active product status with Texas Instruments, ensuring long-term availability and continued manufacturing support. The TL081IN obsolete status necessitates transition to active alternatives for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can TL081CP directly replace TL081IN in all applications?

A: TL081CP is a direct mechanical and functional equivalent within the specified electrical parameters. Both devices share identical 8-DIP package geometry, J-FET amplifier architecture, and supply voltage range (7V to 36V minimum for TL081CP versus 6V for TL081IN). The primary difference is operating temperature range: TL081CP operates 0°C to 70°C, while TL081IN operates -40°C to 105°C. Applications requiring operation below 0°C or above 70°C require TL081IP instead.

Q: What is the difference between TL081CP and TL071CP?

A: Both are J-FET operational amplifiers in 8-DIP packages, but with distinct electrical specifications. TL071CP features higher gain bandwidth product (5.25MHz versus 3MHz) and higher slew rate (13V/µs versus 13V/µs for TL081CP). However, TL071CP has a minimum supply voltage of 10V, restricting use in applications requiring 6V to 9V operation. TL081CP maintains the 7V minimum supply voltage, providing broader application compatibility.

Q: Is LF356N/NOPB compatible with TL081IN applications?

A: LF356N/NOPB shares the same 8-DIP package and J-FET amplifier type, but has significant electrical differences. The minimum supply voltage is 30V (fixed), eliminating compatibility with applications using lower supply voltages. Supply current increases to 5mA versus 1.4mA, requiring higher power budget. LF356N/NOPB is suitable only for applications specifically designed for 30V operation with higher current tolerance.

Q: Which substitute part has the best low-temperature performance?

A: TL081IP and TL071IP both extend operating temperature range to -40°C to 85°C, compared to 0°C to 70°C for commercial-grade variants. TL081IP maintains the original TL081 electrical specifications (3MHz gain bandwidth product, 13V/µs slew rate), while TL071IP offers higher gain bandwidth product (5.25MHz) at the cost of increased minimum supply voltage (10V). Selection depends on specific supply voltage and bandwidth requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed (TL081CP, TL081ACP, TL081BCP, TL081IP, TL071CP, TL071IP, and LF356N/NOPB) are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the TL081IN.

Q: What is the inventory status of substitute parts?

A: TL081CP has the highest inventory availability (88,892 pieces), followed by TL071CP (22,300 pieces). TL081ACP (4,300 pieces), TL081IP (2,448 pieces), and TL081BCP (2,100 pieces) have moderate availability. LF356N/NOPB has the highest inventory among non-TL081 variants (17,483 pieces). TL071IP has the lowest availability (1,148 pieces).

Q: Can I use TL081BCP instead of TL081CP?

A: TL081BCP is functionally equivalent to TL081CP with identical supply voltage range (7V to 36V) and operating temperature (0°C to 70°C). The only difference is input offset voltage specification: TL081BCP specifies 2mV versus 3mV for TL081CP. This represents improved performance and is suitable for applications where lower offset voltage is beneficial or required.