LNK6404D-TL Equivalent & Substitute Parts

Part Overview

The LNK6404D-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the LinkSwitch™-3 series. This isolated power management IC operates at switching frequencies up to 85kHz and delivers 4.1W output power in an 8-SOIC package. The device is Active status and RoHS compliant, designed for offline flyback topology applications requiring integrated current limiting, open loop, over-temperature, and short-circuit protection.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement in circuit designs, maintaining the same package form factor, isolation characteristics, and fault protection features while accommodating variations in power output and voltage ratings within the LinkSwitch product family.

Substiute Parts

LNK6404D-TL

Power IntegrationsIn Stock: 1825LNK6404D-TL Datasheet

Current PartRFQ

LNK604DG-TL

Power IntegrationsIn Stock: 55235LNK604DG-TL Datasheet

Parametric EquivalentRFQ

LNK614DG-TL

Power IntegrationsIn Stock: 5670LNK614DG-TL Datasheet

Parametric EquivalentRFQ

LNK6406D-TL

Power IntegrationsIn Stock: 3192LNK6406D-TL Datasheet

Parametric EquivalentRFQ

LNK6407D-TL

Power IntegrationsIn Stock: 15740LNK6407D-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK6404D-TL are qualified based on the following criteria:

Common Electrical Parameters:

• Topology: Flyback
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Switching Frequency: Up to 85kHz
• Duty Cycle: 55%
• Fault Protection: Current Limiting, Open Loop, Over Temperature, Short Circuit
• Operating Temperature Range: -40°C ~ 150°C (TJ)

Common Mechanical Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width), 7 Leads
• Supplier Device Package: SO-8C
• Mounting Type: Surface Mount

Allowable Variations:

• Voltage - Breakdown: 700V to 725V
• Power (Watts): 4.1W to 7.5W
• Series: LinkSwitch™-3 or LinkSwitch®-II
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®

All substitute parts maintain identical package footprints, isolation characteristics, and protection features, enabling direct circuit substitution within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full RoHS compliance, ensuring long-term availability and regulatory conformance for production designs.

LNK604DG-TL and LNK614DG-TL are LinkSwitch®-II series alternatives with 700V breakdown voltage and 4.1W power output, matching the electrical performance of the LNK6404D-TL. These parts differ in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and series generation. Selection between these and the LNK6404D-TL depends on packaging procurement requirements and supply chain availability.

LNK6406D-TL is a LinkSwitch™-3 series part with identical 725V breakdown voltage and same series generation as the LNK6404D-TL, but delivers 6.1W output power. This part is suitable for designs requiring higher power output within the same package footprint and thermal operating range.

LNK6407D-TL is a LinkSwitch™-3 series part with 725V breakdown voltage and 7.5W output power, representing the highest power option within this substitute group. This part maintains identical package, isolation, and protection characteristics while supporting increased power delivery.

All parts carry REACH Unaffected status and EAR99 ECCN classification, with identical HTSUS code 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can LNK604DG-TL replace LNK6404D-TL in existing designs?

A: Yes. Both parts share identical topology, switching frequency, duty cycle, fault protection, operating temperature range, and 8-SOIC package footprint. The 25V difference in breakdown voltage (700V versus 725V) and series generation (LinkSwitch®-II versus LinkSwitch™-3) do not prevent direct substitution. Packaging format differs (Cut Tape & Digi-Reel® versus Tape & Reel), affecting procurement and handling only.

Q: What is the difference between LNK6406D-TL and LNK6407D-TL?

A: Both are LinkSwitch™-3 series parts with 725V breakdown voltage and identical package, isolation, and protection features. The primary difference is power output: LNK6406D-TL delivers 6.1W while LNK6407D-TL delivers 7.5W. Selection depends on circuit power requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All parts listed, including LNK6404D-TL, LNK604DG-TL, LNK614DG-TL, LNK6406D-TL, and LNK6407D-TL, carry RoHS Compliant status and Moisture Sensitivity Level 1 (Unlimited).

Q: What packaging options are available?

A: LNK6404D-TL, LNK614DG-TL, LNK6406D-TL, and LNK6407D-TL are supplied in Tape & Reel (TR) format. LNK604DG-TL is supplied in Cut Tape (CT) & Digi-Reel® format. All use SO-8C supplier device package with identical 8-SOIC (0.154", 3.90mm Width) footprint.

Q: Can higher power parts substitute for lower power parts?

A: LNK6406D-TL (6.1W) and LNK6407D-TL (7.5W) can substitute for LNK6404D-TL (4.1W) in circuit designs, as they maintain identical package, isolation, and protection characteristics. Higher power capability does not prevent operation in lower power applications.

Q: What is the operating temperature range for all substitute parts?

A: All parts operate across -40°C to 150°C junction temperature (TJ), enabling use in industrial and extended temperature applications.