LC5546LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The LC5546LF is an AC DC offline switcher LED driver IC manufactured by Sanken Electric USA Inc., housed in a TO-220-7 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LC5546LF operates with a maximum supply voltage of 20V and includes an internal switch for single-output LED driving applications across a wide operating temperature range of -55°C to 115°C.

Substiute Parts

LC5546LF

Sanken Electric USA Inc.In Stock: 670321LC5546LF Datasheet

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LNK415LG

Power IntegrationsIn Stock: 1760LNK415LG Datasheet

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NCL30186DDR2G

onsemiIn Stock: 7224NCL30186DDR2G Datasheet

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TPS92020D

Texas InstrumentsIn Stock: 837TPS92020D Datasheet

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TPS92210DR

Texas InstrumentsIn Stock: 32942TPS92210DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LC5546LF is determined by the following critical parameters:

• Product Type: AC DC Offline Switcher topology
• Number of Outputs: Single output configuration
• Internal Switch Requirement: Presence of integrated switching element
• Supply Voltage Compatibility: Maximum supply voltage rating
• Operating Temperature Range: Thermal operating limits
• Mounting and Packaging: Physical form factor and lead configuration
• RoHS Compliance: Environmental regulatory compliance

The substitute parts listed below maintain functional equivalence as AC DC offline switcher LED drivers with single-output configurations. However, substitutes vary in mounting type (surface mount vs. through-hole), package geometry, supply voltage ratings, and thermal specifications. Selection depends on circuit topology requirements and PCB layout constraints.

Parameter Comparison

Engineering Selection Recommendations

TPS92210DR (Texas Instruments) is the closest functional substitute for through-hole to surface-mount migration. It maintains the same maximum supply voltage (20V), operates within compatible temperature ranges (-40°C to 125°C), and is actively manufactured with ROHS3 compliance. The primary design consideration is the transition from TO-220-7 through-hole to 8-SOIC surface-mount packaging, requiring PCB layout modification.

LNK415LG (Power Integrations) offers through-hole mounting compatibility via eSIP-7F package, eliminating PCB redesign requirements. However, it operates at significantly higher supply voltages (36V to 725V), making it suitable only for applications requiring extended voltage range. This part is actively produced and ROHS compliant.

NCL30186DDR2G (onsemi) and TPS92020D (Texas Instruments) are surface-mount alternatives with active product status and ROHS3 compliance. Both support the required single-output AC DC offline switcher topology but require PCB layout changes from through-hole to surface-mount configuration.

All substitute parts maintain RoHS compliance and unlimited moisture sensitivity ratings (MSL 1), ensuring environmental and reliability standards alignment with the original LC5546LF.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LC5546LF with TPS92210DR without PCB modifications?

A: No. TPS92210DR uses 8-SOIC surface-mount packaging versus LC5546LF's TO-220-7 through-hole package. PCB layout redesign is required. LNK415LG offers through-hole compatibility via eSIP-7F package but operates at higher supply voltages (36V minimum).

Q: What is the primary difference between LNK415LG and other substitutes?

A: LNK415LG operates across a much wider supply voltage range (36V to 725V) compared to LC5546LF (maximum 20V). This makes LNK415LG suitable for high-voltage applications but unsuitable for low-voltage circuits designed for the original part.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes maintain RoHS or ROHS3 compliance, matching the environmental standards of the original LC5546LF.

Q: Which substitute has the widest operating temperature range?

A: LNK415LG operates from -40°C to 150°C (TJ), providing the widest thermal range among active substitutes. The original LC5546LF operates from -55°C to 115°C (TA).

Q: Can I use NCL30186DDR2G or TPS92020D as direct replacements?

A: Both are functionally equivalent AC DC offline switcher LED drivers with single outputs, but both require surface-mount PCB redesign. NCL30186DDR2G supports higher maximum supply voltage (25.5V) and multiple topologies (Flyback, SEPIC, Buck, Boost), offering greater design flexibility.

Q: What is the key consideration when selecting between surface-mount and through-hole substitutes?

A: Through-hole substitutes (LNK415LG) preserve existing PCB layouts but may introduce voltage incompatibilities. Surface-mount substitutes (TPS92210DR, NCL30186DDR2G, TPS92020D) require PCB redesign but offer active product status and modern manufacturing support.