KA3846 Equivalent & Substitute Parts

Part Overview

The KA3846 is an offline switch integrated circuit manufactured by onsemi, designed for power management applications in converter topologies operating up to 500kHz. This 16-DIP package component functions as a controller for offline power supply designs. The KA3846 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where legacy component replacement is required.

Substiute Parts

KA3846

onsemiIn Stock: 1447KA3846 Datasheet

Current PartRFQ

UC3846N

Texas InstrumentsIn Stock: 7323UC3846N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The UC3846N from Texas Instruments qualifies as a direct substitute for the KA3846 based on the following critical parameters:

• Package Compatibility: Both components use 16-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical and electrical pin compatibility
• Supply Voltage Range: Identical Vcc/Vdd specification of 6.95V ~ 40V
• Switching Frequency: Both support up to 500kHz operation
• Control Features: Both include Current Limit and Enable control features
• Operating Temperature: Matching 0°C ~ 70°C (TA) range
• Mounting Type: Both are through-hole mounted components
• Pin Configuration: 16-PDIP supplier device package matches exactly

The UC3846N is an active product with enhanced functionality including Frequency Control and Soft Start features, providing additional design flexibility while maintaining full backward compatibility with KA3846 applications.

Parameter Comparison

Engineering Selection Recommendations

The UC3846N is the qualified substitute for KA3846 applications. Selection rationale is based on:

• Product Status: The UC3846N maintains active product status with ongoing manufacturer support, whereas the KA3846 is obsolete
• Regulatory Compliance: Both components share identical REACH and ECCN classifications, ensuring equivalent compliance posture
• Electrical Equivalence: Matching supply voltage range, switching frequency capability, and control feature set ensure functional compatibility in existing circuit designs
• Availability: The UC3846N demonstrates significantly higher inventory availability (7300 pcs vs. 1346 pcs), supporting production continuity and supply chain reliability

Frequently Asked Questions (FAQ)

Q: Can UC3846N directly replace KA3846 in existing designs without PCB modification?

A: Yes. Both components use identical 16-DIP (0.300", 7.62mm) through-hole packaging with matching pin configurations. No PCB layout changes are required for mechanical or electrical substitution.

Q: Are there functional differences between KA3846 and UC3846N?

A: The UC3846N includes additional control features (Frequency Control and Soft Start) not present in the KA3846 specification. These features are supplementary and do not affect basic operation in applications designed for the KA3846.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both components share identical REACH Status (REACH Unaffected) and ECCN (EAR99) classifications, confirming equivalent regulatory compliance.

Q: What is the operating temperature range for both parts?

A: Both the KA3846 and UC3846N operate across 0°C ~ 70°C (TA), providing identical thermal operating specifications.

Q: Are there supply voltage differences between these components?

A: No. Both components specify identical supply voltage range of 6.95V ~ 40V (Vcc/Vdd), ensuring equivalent power supply requirements.

Q: What packaging options are available for UC3846N?

A: The UC3846N is supplied in Tube packaging format, maintaining the 16-PDIP through-hole configuration compatible with KA3846 applications.