KA741 Equivalent & Substitute Parts

Part Overview

The KA741 is a general-purpose operational amplifier manufactured by onsemi, housed in an 8-DIP package for through-hole mounting. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The KA741 operates across a temperature range of 0°C to 70°C and delivers a slew rate of 0.5V/µs with a maximum output current of 25 mA per channel. Identifying compatible substitutes ensures design flexibility while maintaining electrical and mechanical compatibility.

Substiute Parts

KA741

onsemiIn Stock: 3385KA741 Datasheet

Current PartRFQ

UA741CP

Texas InstrumentsIn Stock: 28241UA741CP Datasheet

DirectRFQ

LM741CN/NOPB

Texas InstrumentsIn Stock: 39973LM741CN/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA741 is determined by strict alignment of core electrical and mechanical parameters. The following criteria establish valid substitutes:

Critical Matching Parameters:

• 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
• Current - Output / Channel: 25 mA
• Operating Temperature: 0°C to 70°C

Acceptable Variation Parameters:

• Voltage - Input Offset: 1 to 2 mV (within specification tolerance)
• Current - Supply: 1.5 to 1.7 mA (within operational range)
• Gain Bandwidth Product: 1 to 1.5 MHz (performance enhancement acceptable)
• Voltage - Supply Span: Minimum 7 to 10 V; Maximum 36 V (broader supply range acceptable)

The substitute parts identified—UA741CP and LM741CN/NOPB—meet all critical parameters while offering active product status and enhanced compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

UA741CP (Texas Instruments)

The UA741CP is a direct substitute for the KA741. Both devices share identical electrical specifications including slew rate, input bias current, output current capability, and operating temperature range. The UA741CP carries active product status, ensuring long-term availability and supply chain stability. This part is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The UA741CP features a marginally lower input offset voltage (1 mV versus 2 mV), representing improved performance. Supply voltage range extends to 7 V minimum, providing broader application flexibility.

LM741CN/NOPB (Texas Instruments)

The LM741CN/NOPB is a compatible substitute with all critical electrical parameters matching the KA741. This part maintains active product status and offers ROHS3 compliance with REACH unaffected status. The LM741CN/NOPB provides enhanced gain bandwidth product (1.5 MHz versus unspecified for KA741), delivering superior frequency response. The minimum supply voltage requirement is 10 V, which may restrict use in lower-voltage applications compared to the UA741CP. Input offset voltage matches the KA741 specification at 2 mV.

Selection Basis

Both substitute parts are manufactured by Texas Instruments, an established supplier with robust quality and compliance infrastructure. The transition from the obsolete KA741 to either active substitute ensures design continuity without electrical or mechanical redesign. Selection between UA741CP and LM741CN/NOPB depends on supply voltage requirements and gain bandwidth product needs within the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the UA741CP and LM741CN/NOPB be used interchangeably with the KA741?

A: Both parts are pin-compatible and electrically equivalent substitutes for the KA741. All critical parameters—slew rate, input bias current, output current, and operating temperature—are identical. Direct substitution is possible without circuit modification.

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

A: The LM741CN/NOPB offers higher gain bandwidth product (1.5 MHz versus 1 MHz), providing improved frequency response. The UA741CP supports lower minimum supply voltage (7 V versus 10 V). Input offset voltage differs slightly: UA741CP at 1 mV versus LM741CN/NOPB at 2 mV. Both maintain identical slew rate and output current specifications.

Q: Are the substitute parts available in the same package as the KA741?

A: Yes. Both UA741CP and LM741CN/NOPB are supplied in 8-DIP (0.300", 7.62mm) through-hole packages, identical to the KA741. No PCB layout modification is required.

Q: Why is the KA741 classified as obsolete?

A: The KA741 is no longer in active production by onsemi. The UA741CP and LM741CN/NOPB from Texas Instruments represent current-generation alternatives with equivalent functionality and improved compliance certifications.

Q: Do the substitute parts meet modern regulatory requirements?

A: Yes. Both UA741CP and LM741CN/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The KA741 carries REACH unaffected status but lacks RoHS certification documentation.

Q: What supply voltage range should I use for each substitute?

A: The UA741CP operates with supply voltage from 7 V to 36 V. The LM741CN/NOPB requires 10 V to 36 V minimum. Select based on your circuit's supply voltage specifications.

Q: Is there any performance degradation when substituting the KA741?

A: No performance degradation occurs. The substitute parts maintain or exceed the KA741 electrical specifications. The LM741CN/NOPB provides enhanced gain bandwidth product, representing a performance improvement.