KA5M02659RN Equivalent & Substitute Parts

Part Overview

The KA5M02659RN is an offline switch IC designed for power management applications, specifically configured for flyback and forward converter topologies operating at 67kHz. Manufactured by onsemi as part of the FPS™ series, this component integrates an internal switch with comprehensive fault protection including current limiting, overload, overvoltage, and overtemperature protection.

The KA5M02659RN is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this part.

Substiute Parts

KA5M02659RN

onsemiIn Stock: 4851KA5M02659RN Datasheet

Current PartRFQ

FSL126MR

onsemiIn Stock: 2226FSL126MR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KA5M02659RN is determined by the following critical parameters:

• Package Compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
• Voltage Rating: Breakdown voltage of 650V
• Switching Frequency: 67kHz operation
• Topology Support: Flyback converter capability (primary requirement)
• Duty Cycle: 77% maximum
• Supply Voltage Range: Overlap with 8.8V ~ 30V specification
• Fault Protection: Current limiting, overload, overvoltage, and overtemperature protection

The FSL126MR meets these substitution criteria through identical package configuration, matching voltage ratings, equivalent switching frequency, and compatible topology support with enhanced fault protection capabilities.

Parameter Comparison

Engineering Selection Recommendations

The FSL126MR is the qualified substitute for the KA5M02659RN based on the following engineering criteria:

Electrical Compatibility: Both components share identical breakdown voltage (650V), switching frequency (67kHz), and duty cycle (77%) specifications. The supply voltage range of FSL126MR (8V ~ 26V) encompasses the operational requirements of the KA5M02659RN within the 8.8V ~ 30V specification, with the upper limit difference requiring circuit-level verification for applications operating above 26V.

Package and Mounting: Identical 8-DIP through-hole package ensures direct PCB compatibility without layout modifications.

Fault Protection: FSL126MR incorporates all protection features of the KA5M02659RN with the addition of short circuit protection, providing enhanced reliability.

Product Status and Supply: The FSL126MR is actively manufactured by onsemi, ensuring long-term availability and supply chain continuity compared to the obsolete KA5M02659RN.

Compliance: Both components carry REACH Unaffected status and EAR99 ECCN classification. FSL126MR is RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can FSL126MR directly replace KA5M02659RN in existing designs?

A: Yes, for applications operating within the FSL126MR supply voltage range of 8V ~ 26V. The identical package, switching frequency, duty cycle, and fault protection features ensure functional compatibility. Applications requiring operation above 26V require circuit evaluation.

Q: What is the primary difference between these components?

A: The KA5M02659RN supports both flyback and forward topologies, while FSL126MR is optimized for flyback topology. FSL126MR includes short circuit protection and operates across an extended temperature range (-40°C ~ 105°C versus -25°C ~ 85°C).

Q: Are there package considerations for substitution?

A: Both components use identical 8-DIP (0.300", 7.62mm) through-hole packaging. No PCB layout modifications are required for physical substitution.

Q: What compliance certifications apply to FSL126MR?

A: FSL126MR is RoHS3 compliant and carries REACH Unaffected status with EAR99 ECCN classification, matching the regulatory framework of the KA5M02659RN.

Q: Is the extended operating temperature range of FSL126MR beneficial?

A: The FSL126MR operating range of -40°C ~ 105°C provides broader environmental coverage compared to the KA5M02659RN range of -25°C ~ 85°C, supporting applications in extended temperature environments.