LNK304P Equivalent & Substitute Parts

Part Overview

The LNK304P 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 LNK304P operates at a fixed switching frequency of 66kHz with a 69% duty cycle and supports a 700V breakdown voltage rating.

The LNK304P 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

LNK304P

Power IntegrationsIn Stock: 1123LNK304P Datasheet

Current PartRFQ

LNK304PN

Power IntegrationsIn Stock: 55285LNK304PN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LNK304P is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage breakdown rating: 700V
• Switching frequency: 66kHz
• Duty cycle: 69%
• Topology support: Buck, Buck-Boost, Flyback
• Fault protection suite: Current Limiting, Open Loop, Over Temperature, Short Circuit
• Output isolation: Non-Isolated
• Internal switch configuration: Integrated

Mechanical Equivalence Criteria:

• Package type: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting type: Through Hole
• Supplier device package designation: 8-PDIP-B

Functional Equivalence Criteria:

• Operating temperature range: -40°C to +150°C (TJ)
• Base product number: LNK304
• Manufacturer: Power Integrations

The LNK304PN meets all electrical, mechanical, and functional equivalence criteria and qualifies as a direct substitute for the LNK304P.

Parameter Comparison

Engineering Selection Recommendations

LNK304PN as Primary Substitute:

The LNK304PN is the direct functional equivalent of the LNK304P. All electrical parameters, mechanical specifications, and operational characteristics are identical. The LNK304PN carries an active product status, ensuring ongoing manufacturer support and availability.

Compliance Considerations:

The LNK304P is RoHS non-compliant, while the LNK304PN is RoHS Compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, the LNK304PN satisfies these regulatory requirements without modification to circuit design or performance characteristics.

Supply Chain Advantages:

The LNK304PN is available in significantly higher inventory quantities (55,200 units) compared to the obsolete LNK304P (1,113 units). The LNK304PN is supplied in tube packaging, which is standard for production environments.

Design Continuity:

No circuit modifications, PCB layout changes, or firmware adjustments are required when transitioning from LNK304P to LNK304PN. Pin configuration, electrical ratings, and functional behavior remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can LNK304PN be used as a direct replacement for LNK304P without circuit modifications?

A: Yes. The LNK304PN is electrically and mechanically identical to the LNK304P. No schematic changes, PCB layout modifications, or component value adjustments are necessary. The parts are pin-for-pin compatible and functionally equivalent.

Q: What is the primary difference between LNK304P and LNK304PN?

A: The LNK304P is obsolete with RoHS non-compliant status. The LNK304PN is an active product with RoHS Compliant certification. Both parts share identical electrical specifications, switching characteristics, and package dimensions.

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

A: No. Both parts operate across the same temperature range (-40°C to +150°C junction temperature) and deliver identical switching frequency (66kHz), duty cycle (69%), and fault protection features.

Q: What packaging formats are available?

A: The LNK304P is supplied in standard packaging. The LNK304PN is supplied in tube packaging, which is the industry standard for production quantities and automated assembly processes.

Q: Does the RoHS compliance status of LNK304PN affect circuit performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical performance. The LNK304PN delivers identical electrical characteristics and operational behavior to the LNK304P.

Q: Is the 8-DIP package suitable for both through-hole and surface-mount assembly?

A: The 8-DIP (0.300", 7.62mm) package is designed for through-hole mounting only. Both LNK304P and LNK304PN use this through-hole package type.

Q: What topologies are supported by the LNK304PN?

A: The LNK304PN supports buck, buck-boost, and flyback converter topologies, identical to the LNK304P. The 700V breakdown voltage rating and 66kHz switching frequency apply across all supported topologies.