LC5547LF LED Driver IC - Equivalent & Substitute Parts

Part Overview

The LC5547LF is an AC DC offline switcher LED driver IC manufactured by Sanken Electric USA Inc., designed for single-output lighting applications. This component features an internal switch and operates across a supply voltage range up to 20V with an operating temperature range of -55°C to 115°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

LC5547LF

Sanken Electric USA Inc.In Stock: 1169LC5547LF Datasheet

Current PartRFQ

HV9805MG-G

Microchip TechnologyIn Stock: 3793HV9805MG-G Datasheet

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LNK420LG

Power IntegrationsIn Stock: 4297LNK420LG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC5547LF is determined by the following critical parameters:

• Functional Type: AC DC offline switcher topology with single output and integrated internal switch
• Mounting Configuration: Through-hole or surface-mount packages suitable for LED driver applications
• Voltage Compatibility: Supply voltage specifications that accommodate the application requirements
• Temperature Range: Operating temperature envelope supporting the thermal environment
• Output Configuration: Single-output LED driver functionality
• Compliance: RoHS compliance status and moisture sensitivity level

The two substitute parts identified—HV9805MG-G and LNK420LG—both function as AC DC offline switcher LED drivers with single outputs and integrated switches. However, each presents distinct topology, voltage, and packaging characteristics that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

HV9805MG-G (Microchip Technology)

This substitute is an active product with ROHS3 compliance. It operates as a SEPIC/Step-Up (Boost) topology AC DC offline switcher with a maximum output voltage of 20V, matching the LC5547LF supply specification. The supply voltage range (7.9V to 8.6V) is narrower than the original part. This device is surface-mount in 10-MSOP packaging, requiring PCB layout modifications from the through-hole TO-220-7 configuration. Operating temperature range extends to 125°C, exceeding the original part's upper limit.

LNK420LG (Power Integrations)

This substitute is an active product with RoHS compliance and belongs to the LinkSwitch®-PH series. It employs a Flyback topology with PWM dimming capability and operates across a significantly wider supply voltage range (36V to 725V). The part delivers 4.9A output current at 66kHz switching frequency. Mounting is through-hole in eSIP-7F package, maintaining compatibility with through-hole assembly processes. Operating temperature range reaches 150°C (junction), providing superior thermal performance. This topology and voltage range differ substantially from the original part.

Both substitutes are active products with current manufacturing support and compliance certifications, addressing the obsolescence status of the LC5547LF.

Frequently Asked Questions (FAQ)

Q: Can HV9805MG-G directly replace LC5547LF in existing PCB designs?

A: No. HV9805MG-G uses surface-mount 10-MSOP packaging versus the through-hole TO-220-7 package of LC5547LF. PCB layout redesign is required. Additionally, the SEPIC/Boost topology and narrower supply voltage range (7.9V–8.6V) differ from the original specification.

Q: What are the key differences between HV9805MG-G and LNK420LG?

A: HV9805MG-G uses SEPIC/Boost topology with 7.9V–8.6V supply range and surface-mount packaging. LNK420LG uses Flyback topology with 36V–725V supply range, through-hole eSIP-7F packaging, and includes PWM dimming with 4.9A output current specification. Topology and voltage compatibility determine which is suitable for a given application.

Q: Is package compatibility a critical factor in substitution?

A: Yes. LC5547LF uses through-hole TO-220-7 package. LNK420LG maintains through-hole compatibility (eSIP-7F), while HV9805MG-G requires surface-mount assembly (10-MSOP). Assembly process capability must align with the selected substitute.

Q: Do all three parts meet RoHS compliance requirements?

A: Yes. LC5547LF is RoHS Compliant, HV9805MG-G is ROHS3 Compliant, and LNK420LG is RoHS Compliant. All three meet RoHS standards. Moisture sensitivity level is 1 (Unlimited) for all parts.

Q: Which substitute has the widest operating temperature range?

A: LNK420LG operates from -40°C to 150°C (junction temperature), providing the broadest thermal envelope. LC5547LF operates -55°C to 115°C (ambient), and HV9805MG-G operates -40°C to 125°C (ambient).

Q: Are there voltage compatibility concerns with these substitutes?

A: Yes. LC5547LF maximum supply is 20V. HV9805MG-G operates 7.9V–8.6V (narrower range, but 20V output specification). LNK420LG operates 36V–725V (much wider range). Application supply voltage must fall within the substitute's specified range.