KA3403 Equivalent & Substitute Parts

Part Overview

The KA3403 is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in a 14-pin DIP package. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The KA3403 operates across a wide supply voltage range of 3V to 36V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current characteristics.

Substiute Parts

KA3403

onsemiIn Stock: 1444KA3403 Datasheet

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MC3403N

Texas InstrumentsIn Stock: 2969MC3403N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete KA3403 is determined by functional and electrical compatibility across the following critical parameters:

Functional Equivalence Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 4
• Package / Case: 14-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Electrical Compatibility Criteria:

• Operating Temperature Range: 0°C to 70°C
• Supply Voltage Compatibility: Overlapping or extended supply voltage ranges
• Output Current Capability: Equal to or greater than 20 mA per channel
• Input Bias Current: Within acceptable limits for general-purpose applications
• Bandwidth Performance: Suitable for low-frequency to moderate-frequency applications

The MC3403N from Texas Instruments satisfies these substitution criteria as an active, in-production alternative to the obsolete KA3403.

Parameter Comparison

Engineering Selection Recommendations

KA3403 (onsemi): Product status is obsolete. This component is no longer in active production. REACH compliance status is unaffected. Moisture sensitivity level is 1 (unlimited). This part is suitable only for legacy system maintenance or repair applications where original specifications must be maintained.

MC3403N (Texas Instruments): Product status is active. This component is in current production with 2933 units available in inventory. RoHS3 compliance is confirmed. REACH compliance status is unaffected. Moisture sensitivity level is not applicable. This part is suitable for new designs and ongoing production applications.

The MC3403N is the recommended substitute for the obsolete KA3403. Both components share identical package geometry, pin configuration, and core functional characteristics. The MC3403N provides enhanced performance in slew rate (0.6 V/µs versus 0.4 V/µs) and gain bandwidth product (1 MHz versus 9 kHz). The MC3403N operates with a minimum supply voltage of 5V compared to the KA3403's 3V minimum, and a maximum supply voltage of 30V compared to the KA3403's 36V maximum. Output current capability is increased to 30 mA per channel. These differences are within acceptable substitution parameters for general-purpose amplifier applications.

Frequently Asked Questions (FAQ)

Q: Can the MC3403N directly replace the KA3403 in existing designs?

A: The MC3403N is pin-compatible and functionally equivalent to the KA3403. Both devices are 4-circuit general-purpose operational amplifiers in 14-DIP packages with identical pin assignments. Direct substitution is possible in most applications. However, the minimum supply voltage requirement differs: the MC3403N requires a minimum of 5V, while the KA3403 operates from 3V. Verify that your power supply meets the MC3403N's 5V minimum specification before substitution.

Q: What are the key electrical differences between these parts?

A: The MC3403N provides superior performance in several parameters. Slew rate is increased from 0.4 V/µs to 0.6 V/µs. Gain bandwidth product is significantly higher at 1 MHz compared to 9 kHz. Output current per channel is increased from 20 mA to 30 mA. Input bias current is higher at 200 nA versus 30 nA. Input offset voltage is slightly higher at 2 mV versus 1.5 mV. These differences result in improved bandwidth performance and output drive capability with the MC3403N.

Q: Are there supply voltage compatibility concerns?

A: Yes. The KA3403 operates across 3V to 36V, while the MC3403N operates across 5V to 30V. If your application uses supply voltages below 5V or above 30V, the MC3403N cannot be substituted. Verify your system's supply voltage range before selecting the MC3403N as a replacement.

Q: Is the MC3403N RoHS compliant?

A: Yes. The MC3403N is RoHS3 compliant. The KA3403 does not specify RoHS compliance status. If RoHS compliance is required for your application, the MC3403N meets this requirement.

Q: What is the package configuration for both parts?

A: Both the KA3403 and MC3403N are supplied in 14-pin DIP packages with 0.300-inch (7.62mm) pitch. The physical dimensions and pin assignments are identical, enabling direct socket substitution. The KA3403 is supplied in tube packaging, while the MC3403N is also supplied in tube packaging.

Q: Are there any temperature operating range differences?

A: No. Both the KA3403 and MC3403N operate across the same temperature range of 0°C to 70°C. Temperature performance is equivalent between the two devices.