LC5521D LED Driver IC Equivalent & Substitute Parts

Part Overview

The LC5521D is an AC DC offline switcher LED driver IC manufactured by Sanken Electric USA Inc., designed for single-output lighting applications. This 8-DIP through-hole component features an internal switch and operates across a supply voltage range up to 20V with an operating temperature range of -55°C to 125°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and new production requirements where through-hole or surface-mount alternatives are acceptable.

Substiute Parts

LC5521D

Sanken Electric USA Inc.In Stock: 929LC5521D Datasheet

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LM3497MMX/NOPB

Texas InstrumentsIn Stock: 3835LM3497MMX/NOPB Datasheet

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MP4068GN-Z

Monolithic Power Systems Inc.In Stock: 83156MP4068GN-Z Datasheet

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RT8402GJ6

Richtek USA Inc.In Stock: 3650RT8402GJ6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LC5521D is determined by the following critical parameters:

• Functional Type: AC DC offline switcher topology with single output
• Internal Switch Requirement: Presence or absence of integrated switching element
• Supply Voltage Compatibility: Maximum supply voltage rating must accommodate the application
• Dimming Capability: Support for dimming control (standard or triac-based)
• Mounting and Package Compatibility: Through-hole or surface-mount form factors
• Product Status and Compliance: Active or obsolete status; RoHS and REACH compliance certifications
• Operating Temperature Range: Thermal performance envelope for the target application

The three substitute parts listed below meet the core functional requirements of an AC DC offline switcher LED driver with single output and dimming support, though each presents different trade-offs in packaging, supply voltage range, topology, and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

LM3497MMX/NOPB (Texas Instruments) is the preferred active substitute for new designs. It maintains AC DC offline switcher functionality with triac dimming support and carries active product status with ROHS3 compliance. The surface-mount 10-VSSOP package requires PCB redesign from the through-hole LC5521D but offers superior availability (3800 pcs in stock) and extended thermal performance to 125°C. Supply voltage range (8V–12V) is narrower than the LC5521D but suitable for standard LED driver applications.

MP4068GN-Z (Monolithic Power Systems Inc.) provides an alternative with the lowest supply voltage minimum (4.1V) and integrated output voltage specification (50V) with defined output current (160mA). Active product status and ROHS3 compliance support long-term availability. The 8-SOIC-EP package is compact and widely supported. MSL rating of 2A requires standard moisture control during storage and assembly. This part is optimal for low-voltage input applications.

RT8402GJ6 (Richtek USA Inc.) is an obsolete substitute with the highest supply voltage maximum (30V), making it suitable for applications requiring extended input voltage range. The compact TSOT-23-6 package minimizes board space. However, obsolete status limits long-term procurement viability, and the reduced operating temperature maximum (-40°C to 85°C) may not meet applications requiring the full -55°C to 125°C envelope of the LC5521D.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LC5521D with LM3497MMX/NOPB without circuit modifications?

A: Functional substitution is possible, but circuit redesign is required. The LC5521D is through-hole 8-DIP; the LM3497MMX/NOPB is surface-mount 10-VSSOP. Pin assignments and external component requirements differ. Consult the respective datasheets for schematic and layout adaptation.

Q: What is the key difference between these substitutes in terms of internal switching?

A: The LC5521D includes an internal switch. All three substitutes (LM3497MMX/NOPB, MP4068GN-Z, RT8402GJ6) do not include internal switches, requiring external switching elements in the circuit design. This is a fundamental topology difference that affects circuit complexity and component count.

Q: Which substitute has the best long-term availability?

A: LM3497MMX/NOPB (Texas Instruments) and MP4068GN-Z (Monolithic Power Systems Inc.) both carry active product status, ensuring continued manufacturing and supply. RT8402GJ6 is obsolete and should be avoided for new designs requiring multi-year production support.

Q: Are all substitutes RoHS compliant?

A: Yes. LC5521D is RoHS Compliant; all three substitutes are ROHS3 Compliant, meeting current environmental and regulatory requirements.

Q: What is the impact of MSL (Moisture Sensitivity Level) differences?

A: LC5521D and LM3497MMX/NOPB have MSL 1 (unlimited shelf life). MP4068GN-Z has MSL 2A (4-week limit after bag opening); RT8402GJ6 has MSL 3 (168-hour limit). Higher MSL ratings require stricter moisture control during storage and assembly, increasing handling costs and complexity.

Q: Can I use MP4068GN-Z in applications requiring the full -55°C to 125°C temperature range?

A: No. MP4068GN-Z does not specify an operating temperature range in the provided data. RT8402GJ6 is limited to -40°C to 85°C. Only LM3497MMX/NOPB extends to 125°C maximum. For full low-temperature operation (-55°C), none of the substitutes match the LC5521D specification.

Q: What is the significance of the supply voltage differences?

A: LC5521D supports up to 20V; LM3497MMX/NOPB is limited to 12V; MP4068GN-Z to 5V; RT8402GJ6 to 30V. Application input voltage must fall within the substitute's rated range. MP4068GN-Z is suitable only for low-voltage inputs; RT8402GJ6 accommodates the widest range but is obsolete.