LNK305DN Equivalent & Substitute Parts

Part Overview

The LNK305DN is an offline switch IC manufactured by Power Integrations, designed for non-isolated power conversion applications. This device operates as a LinkSwitch®-TN series component, supporting Buck, Buck-Boost, and Flyback topologies with integrated switching functionality at 66kHz frequency. The LNK305DN is currently discontinued at DiGi Electronics, necessitating identification of equivalent substitute components for ongoing design support and production requirements.

Substiute Parts

LNK305DN

Power IntegrationsIn Stock: 2275LNK305DN Datasheet

Current PartRFQ

LNK305DN-TL

Power IntegrationsIn Stock: 17503LNK305DN-TL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LNK305DN is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Voltage breakdown rating of 700V
• Switching frequency of 66kHz
• Duty cycle of 69%
• Identical fault protection features (Current Limiting, Open Loop, Over Temperature, Short Circuit)
• Operating temperature range of -40°C ~ 150°C (TJ)

Mechanical & Packaging Specifications:

• Package type: 8-SOIC (0.154", 3.90mm Width), 7 Leads
• Supplier device package: SO-8C
• Surface mount mounting type

Functional Specifications:

• Non-isolated output configuration
• Internal switch integration
• Support for Buck, Buck-Boost, and Flyback topologies
• LinkSwitch®-TN series classification

Compliance & Environmental:

• RoHS Compliant status
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected classification

The substitute part LNK305DN-TL meets all these criteria with identical electrical and mechanical specifications. The primary distinction is packaging format (Tape & Reel versus bulk) and product status (Active versus Discontinued).

Parameter Comparison

Engineering Selection Recommendations

The LNK305DN-TL is a direct functional equivalent to the LNK305DN. Both components share identical electrical specifications, mechanical packaging, and compliance certifications. The LNK305DN-TL is the appropriate substitute for the discontinued LNK305DN.

Selection Basis:

1. Product Status: The LNK305DN is discontinued at DiGi Electronics. The LNK305DN-TL maintains active product status with 17,400 pieces in stock, ensuring supply chain continuity.

2. Electrical Equivalence: All critical electrical parameters are identical, including 700V breakdown voltage, 66kHz switching frequency, 69% duty cycle, and comprehensive fault protection features.

3. Mechanical Compatibility: Both components use the 8-SOIC (0.154", 3.90mm Width) package with SO-8C supplier device package designation, ensuring PCB layout and assembly compatibility.

4. Compliance Alignment: Both parts maintain RoHS Compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, meeting regulatory and environmental requirements.

5. Packaging Consideration: The LNK305DN-TL is supplied in Tape & Reel format, which is standard for production environments and offers advantages in automated assembly processes compared to bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can LNK305DN-TL be used as a direct replacement for LNK305DN in existing designs?

A: Yes. The LNK305DN-TL is electrically and mechanically equivalent to the LNK305DN. All functional parameters, including voltage ratings, switching frequency, topology support, and fault protection features, are identical. PCB layouts and circuit designs require no modification.

Q: What is the difference between LNK305DN and LNK305DN-TL?

A: The primary difference is packaging format. The LNK305DN is supplied in bulk packaging, while the LNK305DN-TL is supplied in Tape & Reel (TR) format. Both components are identical in electrical specifications and physical package dimensions (8-SOIC, SO-8C).

Q: Why is the LNK305DN discontinued?

A: The LNK305DN is discontinued at DiGi Electronics. The LNK305DN-TL remains in active production and is the recommended substitute for ongoing supply.

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

A: No. Both components operate across the identical temperature range of -40°C ~ 150°C (TJ) and deliver equivalent thermal performance characteristics.

Q: What is the inventory status of the substitute part?

A: The LNK305DN-TL has 17,400 pieces in stock as new original inventory, providing reliable supply availability for production requirements.

Q: Does the Tape & Reel packaging affect circuit performance?

A: No. Tape & Reel packaging is a supply format only and does not affect electrical performance, reliability, or functional characteristics of the component.

Q: Are both parts RoHS compliant?

A: Yes. Both the LNK305DN and LNK305DN-TL are RoHS Compliant with MSL Level 1 (Unlimited) and REACH Unaffected status.

Q: Can I mix LNK305DN and LNK305DN-TL components in the same production batch?

A: Yes. Both components are functionally identical and can be used interchangeably in the same design and production environment.