KA741I Equivalent & Substitute Parts

Part Overview

The KA741I is a general-purpose operational amplifier manufactured by onsemi, housed in an 8-DIP through-hole package. This device is classified as obsolete, indicating that it is no longer in active production. The KA741I serves as a foundational linear amplifier suitable for general-purpose signal conditioning, filtering, and amplification applications across industrial and consumer electronics.

Due to its obsolete status, sourcing original KA741I components may present supply chain challenges. Equivalent and substitute parts listed in this reference maintain functional compatibility through matching electrical characteristics and identical physical packaging, enabling direct replacement in existing designs without circuit modification.

Substiute Parts

KA741I

onsemiIn Stock: 2842KA741I Datasheet

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LM741CN/NOPB

Texas InstrumentsIn Stock: 39973LM741CN/NOPB Datasheet

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TL061ACP

Texas InstrumentsIn Stock: 2235TL061ACP Datasheet

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UA741CP

Texas InstrumentsIn Stock: 28241UA741CP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KA741I is determined by the following critical parameters:

Mandatory Matching Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Slew Rate: 0.5 V/µs
• Current - Input Bias: 80 nA
• Voltage - Input Offset: 2 mV
• Current - Output / Channel: 25 mA

Acceptable Variation Ranges:

• Current - Supply: 1.5 mA to 1.7 mA
• Operating Temperature Range: Substitute parts may operate within narrower ranges (0°C to 70°C) while maintaining compatibility for applications within this subset

Substitute parts identified in this reference meet all mandatory matching criteria and fall within acceptable variation ranges for supply current. All substitute parts are housed in 8-DIP through-hole packages, ensuring mechanical and electrical pin compatibility with the KA741I.

Parameter Comparison

Engineering Selection Recommendations

LM741CN/NOPB (Texas Instruments)

The LM741CN/NOPB is a direct electrical equivalent to the KA741I with identical slew rate, input bias current, input offset voltage, and output current specifications. This part is in active production status with ROHS3 compliance certification. The operating temperature range is restricted to 0°C to 70°C, which represents a narrower specification than the KA741I. Supply current is marginally higher at 1.7 mA versus 1.5 mA. This substitute is suitable for applications operating within the 0°C to 70°C temperature window.

UA741CP (Texas Instruments)

The UA741CP matches the KA741I across all critical electrical parameters with the exception of input offset voltage, which is specified at 1 mV compared to 2 mV for the KA741I. This represents improved performance in this parameter. The UA741CP is in active production with ROHS3 compliance. Operating temperature range is 0°C to 70°C. Supply current is 1.7 mA. This substitute is suitable for applications operating within the 0°C to 70°C temperature window and benefits from tighter input offset voltage specification.

TL061ACP (Texas Instruments)

The TL061ACP differs fundamentally in amplifier type, classified as J-FET rather than general purpose bipolar. While this part shares the same 8-DIP package and mounting type, it exhibits significantly different electrical characteristics: slew rate of 3.5 V/µs (versus 0.5 V/µs), input bias current of 30 pA (versus 80 nA), and supply current of 0.2 mA (versus 1.5 mA). The TL061ACP is in active production with ROHS3 compliance. This substitute is not recommended for direct replacement in applications designed for the KA741I due to fundamental differences in amplifier topology and electrical behavior.

Frequently Asked Questions (FAQ)

Q: Can the LM741CN/NOPB directly replace the KA741I in all applications?

A: The LM741CN/NOPB provides direct electrical substitution for applications operating within the 0°C to 70°C temperature range. Applications requiring operation below 0°C or above 70°C require evaluation against the KA741I's extended −40°C to 85°C range. Both parts share identical slew rate, input bias current, input offset voltage, and output current specifications.

Q: What is the primary difference between the UA741CP and LM741CN/NOPB?

A: Both parts are functionally equivalent general-purpose amplifiers with identical slew rate and input bias current. The UA741CP specifies a tighter input offset voltage of 1 mV compared to 2 mV for the LM741CN/NOPB. Both operate within 0°C to 70°C temperature range and are ROHS3 compliant.

Q: Why is the TL061ACP listed if it cannot directly replace the KA741I?

A: The TL061ACP is included in this reference because it shares the same 8-DIP package and was historically associated with KA741I substitution discussions. However, the TL061ACP employs J-FET input architecture, resulting in fundamentally different electrical characteristics including 3.5 V/µs slew rate, 30 pA input bias current, and 0.2 mA supply current. Direct substitution is not appropriate without circuit redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The LM741CN/NOPB, UA741CP, and TL061ACP are all ROHS3 compliant. The KA741I does not specify RoHS status in the provided data.

Q: What packaging format is used for these parts?

A: All parts listed—KA741I, LM741CN/NOPB, UA741CP, and TL061ACP—are housed in 8-DIP (0.300", 7.62mm) through-hole packages. This ensures mechanical and electrical pin compatibility for direct board-level substitution.

Q: Does operating temperature range affect substitution decisions?

A: Yes. The KA741I operates from −40°C to 85°C, while all substitute parts operate from 0°C to 70°C. Applications requiring operation outside the 0°C to 70°C window cannot use the listed substitutes without additional thermal management or design modification.

Q: What is the significance of the obsolete status of the KA741I?

A: Obsolete status indicates the KA741I is no longer manufactured by onsemi. This reference provides active production alternatives to ensure design continuity and supply chain reliability. All listed substitutes are in active production status.