LNK409LG LED Driver IC Equivalent & Substitute Parts

Part Overview

The LNK409LG is an AC DC offline switcher LED driver IC manufactured by Power Integrations, designed for lighting applications requiring triac dimming capability. This device operates as a flyback topology converter with an integrated internal switch, delivering 3.26A output current across a wide input voltage range of 36V to 725V. The component is actively produced and RoHS compliant, making it suitable for modern lighting control systems. Substitute parts may be required due to inventory constraints, packaging preferences, or application-specific design modifications while maintaining functional compatibility within the LED driver category.

Substiute Parts

LNK409LG

Power IntegrationsIn Stock: 792LNK409LG Datasheet

Current PartRFQ

TPS92075DDCR/NOPB

Texas InstrumentsIn Stock: 1562TPS92075DDCR/NOPB Datasheet

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TPS92210DR

Texas InstrumentsIn Stock: 32942TPS92210DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LNK409LG LED driver IC are identified based on functional equivalence within the LED driver category. The primary substitution criteria are:

Core Functional Parameters:

• Device Type: AC DC Offline Switcher
• Application: Lighting with Triac dimming capability
• Number of Outputs: 1
• Dimming Method: Triac

Electrical Compatibility Considerations:

• Topology classification (Flyback or equivalent buck/boost configurations)
• Operating temperature range capability
• RoHS and regulatory compliance status
• Moisture sensitivity level

Physical Compatibility Considerations:

• Mounting type (through hole vs. surface mount affects PCB design)
• Package form factor (eSIP-7F vs. SOT-23-THIN vs. 8-SOIC)
• Lead configuration and pitch

The substitute parts TPS92075DDCR/NOPB and TPS92210DR share the core functional classification as AC DC offline switcher LED drivers with triac dimming for lighting applications. However, differences in supply voltage ranges, output current specifications, topology variants, and package types require engineering evaluation for specific circuit implementations.

Parameter Comparison

Engineering Selection Recommendations

LNK409LG Primary Selection Criteria: The LNK409LG remains the specified component for applications requiring high input voltage range (36V to 725V), integrated internal switching capability, and through-hole mounting. This device supports the full operating temperature range of -40°C to 150°C junction temperature and delivers 3.26A output current. Active product status and RoHS compliance confirm ongoing manufacturing support.

TPS92075DDCR/NOPB Substitution Scope: This Texas Instruments device functions as an AC DC offline switcher LED driver with triac dimming for lighting applications. The supply voltage range (11V to 18V) is significantly lower than the LNK409LG, restricting its use to applications with reduced input voltage requirements. Surface mount SOT-23-THIN packaging requires PCB redesign from through-hole implementation. Operating temperature maximum of 125°C (junction) is lower than the LNK409LG specification. ROHS3 compliance and MSL 1 rating confirm regulatory equivalence. Absence of internal switch requires external switching components.

TPS92210DR Substitution Scope: This Texas Instruments device operates as an AC DC offline switcher flyback topology LED driver with triac dimming. Supply voltage range (9V to 20V) is substantially lower than the LNK409LG, limiting application scope to low-voltage input circuits. Surface mount 8-SOIC packaging necessitates PCB layout modification from through-hole design. Operating temperature maximum of 125°C (ambient) differs from the LNK409LG junction temperature specification. ROHS3 compliance and MSL 1 rating provide regulatory alignment. Absence of internal switch requires external switching implementation.

Regulatory and Compliance Alignment: All three devices maintain RoHS compliance status (LNK409LG: RoHS Compliant; TPS92075DDCR/NOPB and TPS92210DR: ROHS3 Compliant), REACH Unaffected designation, and MSL 1 moisture sensitivity rating. ECCN classification EAR99 and HTSUS code 8542.39.0001 are consistent across all parts.

Frequently Asked Questions (FAQ)

Q: Can TPS92075DDCR/NOPB directly replace LNK409LG in existing designs?

A: Direct replacement is not feasible without circuit redesign. The TPS92075DDCR/NOPB operates at significantly lower input voltage (11V to 18V maximum) compared to the LNK409LG (36V to 725V). Additionally, the TPS92075DDCR/NOPB uses surface mount SOT-23-THIN packaging versus the LNK409LG through-hole eSIP-7F package, requiring PCB layout modification. The absence of an internal switch in the TPS92075DDCR/NOPB necessitates external switching components not required by the LNK409LG.

Q: Can TPS92210DR directly replace LNK409LG in existing designs?

A: Direct replacement is not feasible. The TPS92210DR supply voltage range (9V to 20V) is substantially lower than the LNK409LG (36V to 725V), restricting its application to low-voltage input circuits. The TPS92210DR uses surface mount 8-SOIC packaging instead of through-hole eSIP-7F, requiring PCB redesign. The TPS92210DR lacks an internal switch, requiring external switching implementation.

Q: What are the key differences between LNK409LG and its substitutes?

A: The primary differences are: (1) Input voltage range—LNK409LG supports 36V to 725V, while both substitutes operate at 9V to 20V; (2) Internal switching—LNK409LG includes an integrated switch, while TPS92075DDCR/NOPB and TPS92210DR do not; (3) Packaging—LNK409LG uses through-hole eSIP-7F, TPS92075DDCR/NOPB uses surface mount SOT-23-THIN, and TPS92210DR uses surface mount 8-SOIC; (4) Topology—LNK409LG and TPS92210DR use flyback topology, while TPS92075DDCR/NOPB uses buck/boost topology; (5) Operating temperature—LNK409LG reaches 150°C junction temperature, while both substitutes maximum at 125°C.

Q: Are all three devices RoHS compliant?

A: Yes. The LNK409LG is RoHS Compliant. The TPS92075DDCR/NOPB and TPS92210DR are ROHS3 Compliant. All three devices are REACH Unaffected and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What mounting considerations apply when selecting between these devices?

A: The LNK409LG is through-hole mounted, suitable for traditional PCB assembly with formed leads. The TPS92075DDCR/NOPB and TPS92210DR are surface mount devices requiring SMT assembly equipment and processes. Through-hole to surface mount conversion requires complete PCB redesign, including trace routing, pad layout, and assembly procedure changes.

Q: Which device is suitable for high-voltage AC input applications?

A: Only the LNK409LG supports the high input voltage range (36V to 725V) required for direct AC mains input applications. The TPS92075DDCR/NOPB and TPS92210DR are limited to 11V to 20V and 9V to 20V respectively, requiring pre-regulation or step-down conversion for AC mains applications.

Q: Do all devices support triac dimming?

A: Yes. All three devices—LNK409LG, TPS92075DDCR/NOPB, and TPS92210DR—support triac dimming for lighting applications.

Q: What is the significance of internal switch presence in the LNK409LG?

A: The LNK409LG integrates an internal switch within the IC package, reducing external component count and simplifying circuit design. The TPS92075DDCR/NOPB and TPS92210DR lack internal switches, requiring external switching transistors or MOSFETs, increasing component count and PCB complexity.