LC5546LD LED Driver IC Equivalent & Substitute Parts

Part Overview

The LC5546LD is an AC DC offline switcher LED driver IC manufactured by Sanken Electric USA Inc., designed for single-output lighting applications. This through-hole 8-DIP component operates across a supply voltage range up to 20V and is classified as active product status with RoHS compliance. Substitute parts are identified when equivalent functional categories, output configurations, and compliance certifications align with the original specification, enabling direct component selection for design flexibility and supply chain continuity.

Substiute Parts

LC5546LD

Sanken Electric USA Inc.In Stock: 1087LC5546LD Datasheet

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LNK415EG

Power IntegrationsIn Stock: 16937LNK415EG Datasheet

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LT3799IMSE#PBF

Analog Devices Inc.In Stock: 2589LT3799IMSE#PBF Datasheet

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MXHV9910B

IXYS Integrated Circuits DivisionIn Stock: 1096MXHV9910B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LC5546LD are qualified based on the following criteria derived from provided specifications:

• Functional Category: All substitutes must be classified as Power Management (PMIC) LED driver ICs
• Type: AC DC offline switcher topology required
• Output Configuration: Single output (1 output) mandatory
• Product Status: Active status only
• Compliance: RoHS compliant and MSL Level 1 (Unlimited) required
• Supply Voltage Compatibility: Maximum supply voltage must accommodate the original 20V specification
• Operating Temperature Range: Must support the -55°C to 125°C operating window or equivalent industrial range
• Dimming Capability: Dimming support (PWM or Triac) aligns with LED driver functionality

The three identified substitutes—LNK415EG, LT3799IMSE#PBF, and MXHV9910B—meet these core criteria while offering variations in topology (Flyback, Step-Down), mounting type (surface mount vs. through-hole), and package configuration.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain active product status and full RoHS compliance, ensuring regulatory continuity and long-term availability. Selection between substitutes depends on circuit topology requirements and board layout constraints:

LNK415EG (Power Integrations LinkSwitch®-PH series) provides through-hole mounting compatibility with the original LC5546LD, supporting higher supply voltage (725V max) and PWM dimming at 66kHz. Operating temperature extends to 150°C (TJ), offering enhanced thermal margin.

LT3799IMSE#PBF (Analog Devices) implements Flyback topology with Triac dimming support, suitable for applications requiring phase-cut dimming control. Surface-mount 16-MSOP-EP package requires PCB redesign. No internal switch requires external switching element integration.

MXHV9910B (IXYS) employs Step-Down (Buck) topology with PWM dimming at 64kHz. Surface-mount 8-SOIC package and lower maximum operating temperature (85°C TA) restrict thermal applications compared to alternatives. No internal switch requires external switching element.

Frequently Asked Questions (FAQ)

Q: Can LC5546LD be directly replaced with LNK415EG without PCB modification?

A: LNK415EG maintains through-hole mounting and 8-pin configuration, enabling direct socket replacement. However, pin assignment and control signal requirements must be verified against respective datasheets before implementation.

Q: What is the primary difference between LT3799IMSE#PBF and the other substitutes?

A: LT3799IMSE#PBF is the only substitute featuring Triac dimming capability, enabling phase-cut dimming control required in certain lighting applications. It also lacks internal switching elements, requiring external switch integration. Surface-mount packaging necessitates board redesign.

Q: Is MXHV9910B suitable for high-temperature applications?

A: MXHV9910B operates to 85°C (TA) maximum, which is lower than LC5546LD (125°C TA) and LNK415EG (150°C TJ). Applications requiring sustained operation above 85°C ambient should select alternative substitutes.

Q: Do all substitutes maintain RoHS compliance?

A: Yes. LC5546LD is RoHS Compliant; LNK415EG is RoHS Compliant; LT3799IMSE#PBF and MXHV9910B are ROHS3 Compliant. All meet current regulatory requirements.

Q: What mounting considerations apply when selecting a substitute?

A: LC5546LD and LNK415EG are through-hole components suitable for existing DIP sockets. LT3799IMSE#PBF and MXHV9910B are surface-mount devices requiring PCB redesign and reflow soldering processes.

Q: Are all substitutes available in equivalent inventory quantities?

A: Inventory levels vary. LNK415EG (16,864 pcs), MXHV9910B (1,075 pcs), and LT3799IMSE#PBF (2,500 pcs) are all in stock. Verify current availability with supplier before design commitment.