CS1680-FZZR LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1680-FZZR is an LED Driver IC manufactured by Cirrus Logic Inc., designed for offline AC/DC switching applications with Triac dimming capability. This component operates as a step-down (buck) and step-up (boost) converter in the 11V to 17V supply range, with a fixed 15V output at 1.3kHz to 3.3kHz switching frequency. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

CS1680-FZZR

Cirrus Logic Inc.In Stock: 3656CS1680-FZZR Datasheet

Current PartRFQ

HV9922N3-G

Microchip TechnologyIn Stock: 943HV9922N3-G Datasheet

MFR RecommendedRFQ

LNK409LG

Power IntegrationsIn Stock: 792LNK409LG Datasheet

MFR RecommendedRFQ

LYT0006P

Power IntegrationsIn Stock: 35222LYT0006P Datasheet

MFR RecommendedRFQ

LYT1602D-TL

Power IntegrationsIn Stock: 1179LYT1602D-TL Datasheet

MFR RecommendedRFQ

TS19450CS RLG

Taiwan Semiconductor CorporationIn Stock: 1218TS19450CS RLG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS1680-FZZR is determined by the following critical parameters:

• AC/DC Offline Switcher Type: All substitutes must function as offline AC/DC switcher ICs
• Dimming Capability: Triac dimming support is required for lighting applications
• Topology Compatibility: Step-down (buck) and/or step-up (boost) topologies are acceptable
• Supply Voltage Range: Substitutes must accommodate the input voltage requirements
• Output Characteristics: Fixed or adjustable output voltage suitable for LED driver applications
• Switching Frequency: Operating frequency range compatible with offline LED driver design
• Thermal Performance: Operating temperature range of -40°C to 125°C or better
• Package Compatibility: Surface mount or through-hole packages acceptable depending on board design

The five substitute parts listed below meet these criteria through different topologies and feature sets, enabling designers to select alternatives based on specific application requirements and availability.

Parameter Comparison

Engineering Selection Recommendations

HV9922N3-G (Microchip Technology): Active product status with ROHS3 compliance and unlimited MSL rating. Suitable for new designs requiring Triac dimming in compact TO-92-3 through-hole package. Lower maximum operating temperature (85°C) compared to original part.

LNK409LG (Power Integrations LinkSwitch-PH Series): Active product with RoHS compliance and superior thermal performance (-40°C to 150°C). Flyback topology with integrated switch and 3.26A output capability. Highest supply voltage range (36V to 725V) among substitutes. eSIP-7F package requires board redesign from original 16-TSSOP footprint.

LYT0006P (Power Integrations LYTSwitch-0 Series): Active product with RoHS compliance and unlimited MSL. Offers multiple topology options (Flyback, SEPIC, Buck, Boost) in 8-PDIP-B through-hole package. Highest current capability (401mA) and widest input voltage range (85VAC to 308VAC). Requires board redesign due to package change.

LYT1602D-TL (Power Integrations LYTSwitch-1 Series): Active product with RoHS compliance and unlimited MSL. Surface-mount compatible with 20kHz switching frequency. Buck topology with 90VAC to 308VAC input range. Tape & Reel packaging suitable for high-volume production.

TS19450CS RLG (Taiwan Semiconductor): Obsolete product status with ROHS3 compliance and MSL 3 rating matching original part. Supports both Analog and PWM dimming modes. 8-SOIC surface-mount package. Widest supply voltage range (8V to 450V) among all options.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CS1680-FZZR with any of these substitutes without board modifications?

A: Only LYT1602D-TL and TS19450CS RLG maintain surface-mount packaging compatible with the original 16-TSSOP footprint. HV9922N3-G, LNK409LG, and LYT0006P require board redesign due to different package types (TO-92-3, eSIP-7F, and 8-PDIP-B respectively).

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

A: LNK409LG, LYT0006P, and LYT1602D-TL are all active products from Power Integrations with established supply chains. HV9922N3-G is active from Microchip Technology. TS19450CS RLG is obsolete and should not be selected for new designs.

Q: What is the key difference between Triac and PWM dimming support?

A: Triac dimming is used in AC mains-powered lighting applications where phase-cut dimming is applied at the AC input. PWM dimming controls brightness through pulse-width modulation of the DC output. HV9922N3-G and LNK409LG support Triac dimming directly. TS19450CS RLG supports both Analog and PWM dimming but not Triac dimming.

Q: Are all substitutes RoHS compliant?

A: Yes. HV9922N3-G and TS19450CS RLG are ROHS3 compliant. LNK409LG, LYT0006P, and LYT1602D-TL are RoHS compliant. All meet environmental regulatory requirements.

Q: Which substitute has the highest operating temperature rating?

A: LNK409LG and TS19450CS RLG both support -40°C to 150°C operating temperature range, exceeding the original CS1680-FZZR specification of -40°C to 125°C.

Q: What is the significance of MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely without moisture baking requirements. MSL 3 (168 Hours) requires moisture baking within 168 hours of opening the sealed package. HV9922N3-G, LNK409LG, and LYT0006P have MSL 1 ratings, providing superior shelf-life and handling flexibility compared to the original part's MSL 3 rating.

Q: Can I use LYT0006P if my application requires both buck and boost topologies?

A: Yes. LYT0006P supports Flyback, SEPIC, Step-Down (Buck), and Step-Up (Boost) topologies, making it the most flexible option for applications requiring multiple conversion modes.