CS1616-FSZR LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1616-FSZR is an LED Driver IC manufactured by Cirrus Logic Inc., designed for AC DC offline switching applications with Flyback, Step-Down (Buck), and Step-Up (Boost) topologies. This component supports Triac dimming for lighting applications and operates across a supply voltage range of 11V to 17V with a frequency range of 6kHz to 200kHz. The CS1616-FSZR is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current product availability and compliance standards.

Substiute Parts

CS1616-FSZR

Cirrus Logic Inc.In Stock: 4233CS1616-FSZR Datasheet

Current PartRFQ

FL7733AMX

onsemiIn Stock: 40232FL7733AMX Datasheet

MFR RecommendedRFQ

LT3799IMSE#TRPBF

Analog Devices Inc.In Stock: 945LT3799IMSE#TRPBF Datasheet

MFR RecommendedRFQ

LYT3325D-TL

Power IntegrationsIn Stock: 17586LYT3325D-TL Datasheet

MFR RecommendedRFQ

MP4001DS-LF

Monolithic Power Systems Inc.In Stock: 1073MP4001DS-LF Datasheet

MFR RecommendedRFQ

RT8458GJ6

Richtek USA Inc.In Stock: 2050RT8458GJ6 Datasheet

MFR RecommendedRFQ

TPS92411DBVR

Texas InstrumentsIn Stock: 203382TPS92411DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS1616-FSZR is determined by the following critical parameters:

• Type & Topology: AC DC Offline Switcher with Flyback, Step-Down (Buck), and/or Step-Up (Boost) capability
• Dimming Method: Triac dimming support for lighting control
• Number of Outputs: Single output configuration
• Supply Voltage Range: Compatibility with 11V to 17V input or overlapping range
• Operating Temperature: -40°C to 125°C or higher
• Package Compatibility: 16-pin surface mount packages (16-SOIC or equivalent pin count)
• Product Status: Active or available alternatives to obsolete part

Substitute parts are grouped into two categories:

Category A - Direct Topology Match (Flyback + Buck + Boost + Triac Dimming):

• LYT3325D-TL (Power Integrations): Maintains all three topologies with Triac dimming, 16-SO package, active status
• TPS92411DBVR (Texas Instruments): Supports all three topologies with internal switch, SOT-23-5 package, active status

Category B - Partial Topology Match (Flyback or Buck + Triac Dimming):

• LT3799IMSE#TRPBF (Analog Devices Inc.): Flyback topology with Triac dimming, 16-MSOP-EP package, active status
• FL7733AMX (onsemi): Flyback + Buck + Boost with Analog dimming (not Triac), 8-SOIC package, active status

Category C - Alternative Topology (Buck Only + PWM or Analog Dimming):

• MP4001DS-LF (Monolithic Power Systems Inc.): Step-Down (Buck) topology with PWM dimming, 8-SOIC package, active status
• RT8458GJ6 (Richtek USA Inc.): Step-Down (Buck) topology with Analog dimming, TSOT-23-6 package, active status

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Identical Topology:

LYT3325D-TL is the primary recommendation for applications requiring Flyback, Step-Down (Buck), and Step-Up (Boost) topologies with Triac dimming. This part maintains the same 16-SOIC package footprint, supports the same dimming method, and is actively manufactured by Power Integrations. The operating temperature range extends to 150°C, providing additional thermal margin. RoHS compliance and MSL rating of 3 (168 Hours) match the original specification.

TPS92411DBVR offers an alternative with all three topologies and Triac dimming capability, featuring an internal switch and extended supply voltage range (7.5V to 100V). The SOT-23-5 package requires PCB layout modification. This part is actively produced by Texas Instruments with ROHS3 compliance and superior MSL rating of 1 (Unlimited).

For Flyback-Only Applications with Triac Dimming:

LT3799IMSE#TRPBF supports Flyback topology with Triac dimming in a 16-MSOP-EP package. This part is actively manufactured by Analog Devices Inc. with ROHS3 compliance and MSL rating of 1 (Unlimited). The frequency range extends to 300kHz, providing design flexibility.

For Applications Tolerating Topology Reduction:

FL7733AMX provides Flyback, Step-Down (Buck), and Step-Up (Boost) topologies but uses Analog dimming instead of Triac. The 8-SOIC package requires circuit redesign. This part is actively produced by onsemi with ROHS3 compliance and MSL rating of 1 (Unlimited).

MP4001DS-LF and RT8458GJ6 are suitable only for designs that can operate with Step-Down (Buck) topology exclusively. These parts use PWM and Analog dimming respectively and require significant circuit modification. Both are actively manufactured with ROHS3 compliance.

Compliance Considerations:

All substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original CS1616-FSZR. MSL ratings vary; parts with MSL 1 (Unlimited) offer superior moisture handling during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can LYT3325D-TL directly replace CS1616-FSZR without PCB modification?

A: LYT3325D-TL maintains the same 16-SOIC package footprint and pinout compatibility for direct PCB replacement. However, functional verification is required to confirm pin-to-pin signal compatibility and control logic alignment, as internal architecture differs between manufacturers.

Q: Why does TPS92411DBVR use a different package (SOT-23-5) than the original CS1616-FSZR (16-SOIC)?

A: TPS92411DBVR integrates an internal switch, reducing the external component count and allowing a smaller package. This design approach requires PCB layout redesign but offers improved integration and thermal performance.

Q: What is the difference between Triac, PWM, and Analog dimming methods?

A: Triac dimming controls LED brightness by modulating the AC line voltage phase angle, suitable for AC-powered lighting. PWM dimming switches the output on and off at high frequency to control average brightness. Analog dimming adjusts output voltage or current linearly. The dimming method affects circuit topology and control requirements; substitution between methods requires design modification.

Q: Can FL7733AMX replace CS1616-FSZR if the application uses Analog dimming instead of Triac?

A: FL7733AMX supports the same topologies (Flyback, Buck, Boost) but implements Analog dimming. If the application circuit can be modified to accept Analog dimming control signals, FL7733AMX is functionally compatible. The 8-SOIC package requires PCB redesign.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be stored in ambient conditions before moisture absorption affects solderability. MSL 1 (Unlimited) allows indefinite storage. MSL 3 (168 Hours) requires baking before reflow if storage exceeds 168 hours. TPS92411DBVR and LT3799IMSE#TRPBF offer superior MSL ratings for supply chain flexibility.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute part has the widest supply voltage range?

A: MP4001DS-LF supports 12V to 450V supply voltage, the widest range among substitutes. However, this part uses Buck topology only and PWM dimming, requiring significant circuit modification from the original CS1616-FSZR design.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute part has different topology support, dimming methods, package configurations, and pin assignments. Selection must be based on specific application requirements. Interchangeability requires design verification and potential circuit modification.