LNK306P Equivalent & Substitute Parts

Part Overview

The LNK306P is an offline switch IC from Power Integrations' LinkSwitch®-TN series, designed for power management applications in buck, buck-boost, and flyback converter topologies. This component integrates an internal switch with comprehensive fault protection including current limiting, open loop control, over-temperature, and short-circuit protection. The LNK306P operates at a fixed switching frequency of 66kHz with a 69% duty cycle and supports a 700V breakdown voltage rating.

The LNK306P carries an obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for legacy systems utilizing this topology.

Substiute Parts

LNK306P

Power IntegrationsIn Stock: 1387LNK306P Datasheet

Current PartRFQ

LNK306PN

Power IntegrationsIn Stock: 35224LNK306PN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LNK306P is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Equivalence Requirements:

• Identical manufacturer (Power Integrations)
• Same series designation (LinkSwitch®-TN)
• Matching voltage breakdown rating (700V)
• Identical switching frequency (66kHz)
• Matching duty cycle specification (69%)
• Equivalent fault protection features (Current Limiting, Open Loop, Over Temperature, Short Circuit)
• Same output isolation classification (Non-Isolated)
• Integrated internal switch functionality

Mechanical Equivalence Requirements:

• Identical package type (8-DIP, 0.300", 7.62mm, 7 Leads)
• Same mounting technology (Through Hole)
• Compatible supplier device package designation (8-PDIP-B)

Thermal Equivalence:

• Matching operating temperature range (-40°C to 150°C TJ)

The LNK306PN meets all substitution criteria as a direct equivalent part. The primary distinction between LNK306P and LNK306PN is packaging format (DIP tube vs. standard DIP) and product status (obsolete vs. active), with no impact on electrical or thermal performance.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LNK306PN

The LNK306PN is the direct functional equivalent to the LNK306P. All electrical parameters, thermal specifications, and mechanical dimensions are identical. The LNK306PN is the appropriate selection for new designs, production continuity, and component replacement in existing applications.

Compliance Considerations:

The LNK306PN carries active product status from Power Integrations, ensuring ongoing technical support, documentation availability, and supply chain continuity. The LNK306PN is RoHS Compliant, meeting current environmental and regulatory requirements for electronic components in most jurisdictions. The LNK306P is RoHS non-compliant and carries obsolete status, limiting its suitability for new production or long-term supply assurance.

Packaging and Inventory:

The LNK306PN is available in tube packaging with significantly higher inventory levels (35,200 pieces) compared to the LNK306P (1,319 pieces). This inventory differential reflects the active market status of the LNK306PN and supports reliable procurement for production requirements.

Application Continuity:

Both parts support identical converter topologies (buck, buck-boost, and flyback), operate at the same switching frequency, and provide equivalent fault protection. Direct substitution of LNK306PN for LNK306P requires no circuit modifications, PCB redesign, or firmware changes.

Frequently Asked Questions (FAQ)

Q: Can LNK306PN be used as a direct replacement for LNK306P in existing designs?

A: Yes. The LNK306PN is electrically and mechanically identical to the LNK306P. All electrical parameters, thermal ratings, package dimensions, and pin configurations match exactly. No circuit modifications or PCB changes are required for substitution.

Q: What is the difference between LNK306P and LNK306PN?

A: The primary differences are product status and packaging format. The LNK306P is obsolete and supplied in standard DIP packaging. The LNK306PN is active and supplied in tube packaging. The LNK306P is RoHS non-compliant; the LNK306PN is RoHS Compliant. All electrical and thermal specifications are identical.

Q: Why is the LNK306P marked as obsolete?

A: The LNK306P has been superseded by the LNK306PN. Power Integrations maintains the LNK306PN as the active product in this family. The obsolete designation indicates that the LNK306P is no longer in active production and future availability cannot be assured.

Q: Are there any thermal or frequency differences between these parts?

A: No. Both parts operate at 66kHz switching frequency, support a 69% duty cycle, and have identical operating temperature ranges (-40°C to 150°C TJ). Thermal performance and frequency characteristics are equivalent.

Q: What converter topologies are supported by the LNK306PN?

A: The LNK306PN supports buck, buck-boost, and flyback converter topologies. It is suitable for offline power supply applications requiring non-isolated output configurations.

Q: Does the tube packaging of LNK306PN affect electrical performance?

A: No. Packaging format (tube vs. standard DIP) affects only handling, storage, and assembly processes. Electrical performance, thermal characteristics, and reliability are unaffected by packaging format.

Q: What fault protection features are included in the LNK306PN?

A: The LNK306PN includes current limiting, open loop control, over-temperature protection, and short-circuit protection. These features are identical to the LNK306P.

Q: Is the LNK306PN suitable for new product designs?

A: Yes. The LNK306PN is the recommended choice for new designs. Its active product status ensures long-term availability, technical support, and compliance with current regulatory standards including RoHS requirements.