KA741DTF Equivalent & Substitute Parts

Part Overview

The KA741DTF is a general-purpose operational amplifier manufactured by onsemi in 8-SOIC surface mount packaging. This device is classified as obsolete, indicating it is no longer in active production. The KA741DTF serves as a foundational linear amplifier for general-purpose applications requiring single-circuit operational amplification with standard performance characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, production support, and long-term component availability. Substitute parts listed in this reference maintain functional compatibility through matching package geometry, pin configuration, and core electrical parameters while offering improved availability and product status.

Substiute Parts

KA741DTF

onsemiIn Stock: 1722KA741DTF Datasheet

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THS4151ID

Texas InstrumentsIn Stock: 66101THS4151ID Datasheet

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TL061ACDR

Texas InstrumentsIn Stock: 5348TL061ACDR Datasheet

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TL071ACD

STMicroelectronicsIn Stock: 4169TL071ACD Datasheet

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TL071IDR

Texas InstrumentsIn Stock: 63327TL071IDR Datasheet

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UA741CD

Texas InstrumentsIn Stock: 38358UA741CD Datasheet

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UA741CDR

Texas InstrumentsIn Stock: 35386UA741CDR Datasheet

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UA741CDT

STMicroelectronicsIn Stock: 82224UA741CDT Datasheet

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UA741IDT

STMicroelectronicsIn Stock: 9257UA741IDT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KA741DTF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution logic is organized around the following parameters:

Package Compatibility: All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring direct PCB footprint compatibility and pin-to-pin correspondence.

Amplifier Type Classification: Substitute parts are grouped into two functional categories:

• General Purpose Amplifiers (UA741CD, UA741CDR, UA741CDT, UA741IDT): Direct functional equivalents with identical amplifier type classification
• J-FET Amplifiers (TL061ACDR, TL071ACD, TL071IDR): Alternative topology with superior input bias current performance
• Differential Amplifiers (THS4151ID): High-performance alternative with enhanced bandwidth characteristics

Core Electrical Parameters: Substitution validity is determined by matching or exceeding the following parameters:

• Slew Rate (minimum 0.5 V/µs for general-purpose equivalents)
• Current - Input Bias (80 nA baseline for general-purpose types)
• Voltage - Input Offset (2 mV maximum for general-purpose types)
• Current - Supply (1.5 mA baseline)
• Current - Output / Channel (25 mA minimum)
• Operating Temperature Range (minimum 0°C to 70°C overlap)

Single Circuit Configuration: All substitute parts maintain single-circuit (1 circuit) operational amplifier architecture matching the KA741DTF.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (General Purpose Amplifiers):

The UA741CDR and UA741CDT represent the most direct functional equivalents to the KA741DTF. Both parts maintain identical slew rate (0.5 V/µs), input bias current (80 nA for UA741CDR; 10 nA for UA741CDT), and output current specifications. UA741CDR is classified as Active product status with ROHS3 compliance, providing optimal long-term availability. UA741CDT, also Active status with ROHS3 compliance, offers an extended operating temperature range (-40°C to 70°C) and improved input bias current (10 nA), making it suitable for applications requiring enhanced temperature performance.

UA741CD maintains Last Time Buy status, indicating limited future availability, and is therefore not recommended for new designs requiring extended production support.

UA741IDT extends the operating temperature range to -40°C to 105°C with improved input bias current (10 nA), providing superior performance for wide-temperature applications while maintaining all other electrical parameters.

Secondary Substitutes (J-FET Amplifiers):

TL061ACDR and TL071ACD/TL071IDR offer J-FET input topology with significantly reduced input bias current (0.03 nA to 0.065 nA range) compared to the KA741DTF baseline of 80 nA. These parts are suitable for applications where input bias current minimization is critical. TL061ACDR operates at 0.2 mA supply current, providing ultra-low power consumption. TL071IDR is Active status with extended temperature range (-40°C to 85°C) and ROHS3 compliance.

High-Performance Alternative (Differential Amplifier):

THS4151ID represents a high-performance alternative with differential output configuration, 650 V/µs slew rate, and 340 MHz gain bandwidth product. This part is suitable only for applications requiring differential signal processing and high-frequency performance. The significantly elevated supply current (17.5 mA) and input bias current (4.3 µA) make this part unsuitable as a direct replacement for standard general-purpose applications.

Compliance and Availability:

All recommended substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes. Active product status parts (UA741CDR, UA741CDT, UA741IDT, TL061ACDR, TL071IDR, THS4151ID) provide superior long-term availability compared to the obsolete KA741DTF.

Frequently Asked Questions (FAQ)

Q: Can UA741CDR be used as a direct replacement for KA741DTF in existing designs?

A: Yes. UA741CDR maintains identical electrical specifications for slew rate (0.5 V/µs), input bias current (80 nA), and output current (25 mA). Both parts use 8-SOIC surface mount packaging with identical pin configuration. The primary difference is product status: UA741CDR is Active, while KA741DTF is Obsolete. UA741CDR is recommended for production continuity.

Q: What is the difference between general-purpose and J-FET amplifier substitutes?

A: General-purpose amplifiers (UA741 series) use bipolar input stages with input bias currents in the 10-80 nA range. J-FET amplifiers (TL061, TL071 series) use field-effect transistor input stages with input bias currents in the picoampere range (0.02-0.065 nA). J-FET types are selected when applications require minimal input bias current or high input impedance. Both topologies maintain the same 8-SOIC package and single-circuit configuration.

Q: Is THS4151ID compatible with KA741DTF applications?

A: THS4151ID is not recommended as a direct replacement. While both parts use 8-SOIC packaging, THS4151ID is a differential amplifier with fundamentally different output configuration and significantly different electrical characteristics: 650 V/µs slew rate (versus 0.5 V/µs), 4.3 µA input bias current (versus 80 nA), and 17.5 mA supply current (versus 1.5 mA). THS4151ID is suitable only for applications specifically requiring differential output topology and high-frequency performance.

Q: What is the operating temperature range consideration for substitution?

A: KA741DTF operates from 0°C to 70°C. Most substitute parts maintain this range. UA741IDT extends to -40°C to 105°C, and TL071IDR extends to -40°C to 85°C. For applications operating within the 0°C to 70°C range, all listed substitutes are compatible. For extended temperature applications, UA741IDT or TL071IDR are required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (UA741CD, UA741CDR, UA741CDT, UA741IDT, TL061ACDR, TL071ACD, TL071IDR, THS4151ID) are ROHS3 compliant. The original KA741DTF does not specify RoHS status. ROHS3 compliance ensures compatibility with modern manufacturing and environmental regulations.

Q: What is the significance of product status (Active, Last Time Buy, Obsolete)?

A: Product status indicates manufacturing and availability status. Active parts are in current production with indefinite availability. Last Time Buy parts have limited production windows before discontinuation. Obsolete parts are no longer manufactured. For new designs and long-term production support, Active status parts (UA741CDR, UA741CDT, UA741IDT, TL061ACDR, TL071IDR, THS4151ID) are recommended.

Q: Can I use UA741CDT instead of UA741CDR?

A: Yes. Both parts are functionally equivalent with identical electrical specifications. UA741CDT offers improved input bias current (10 nA versus 80 nA) and identical operating temperature range (0°C to 70°C). Both are Active status with ROHS3 compliance. Selection between these parts depends on packaging preference (Cut Tape & Digi-Reel for both) and specific application requirements for input bias current performance.

Q: What packaging formats are available for substitute parts?

A: All substitute parts use 8-SOIC surface mount package with 0.154" (3.90mm) width. Packaging formats vary by manufacturer and part number: Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR). These format differences do not affect electrical compatibility or PCB footprint; they reflect supply chain and handling preferences.