CS1613-FSZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1613-FSZ is an offline LED driver IC manufactured by Cirrus Logic Inc., designed for AC/DC lighting applications with Triac dimming capability. This 16-SOIC packaged component operates across an 11V to 17V supply range and supports both step-down (buck) and step-up (boost) topologies. The part is currently obsolete, making equivalent substitutes necessary for new designs and production continuity.

Substiute Parts

CS1613-FSZ

Cirrus Logic Inc.In Stock: 989CS1613-FSZ Datasheet

Current PartRFQ

MP4068GS

Monolithic Power SystemsIn Stock: 966MP4068GS Datasheet

MFR RecommendedRFQ

TPS92074DDCR

Texas InstrumentsIn Stock: 3932TPS92074DDCR Datasheet

MFR RecommendedRFQ

TPS92075D/NOPB

Texas InstrumentsIn Stock: 1183TPS92075D/NOPB Datasheet

MFR RecommendedRFQ

TPS92314AD/NOPB

Texas InstrumentsIn Stock: 1597TPS92314AD/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS1613-FSZ is determined by the following critical parameters:

Primary Substitution Criteria:

• AC/DC offline switcher topology
• Single output configuration
• Supply voltage range compatibility (11V minimum to 17V maximum)
• Triac dimming capability for lighting applications
• Operating temperature range (-40°C to 125°C)
• Surface mount packaging

Substitution Logic: The CS1613-FSZ can be replaced by parts that maintain the same functional topology (AC/DC offline switcher), support Triac dimming, and operate within compatible voltage ranges. Package differences are acceptable if the electrical interface and pin configuration can be accommodated in the design. Parts with active product status are preferred over obsolete alternatives.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TPS92075D/NOPB

The TPS92075D/NOPB from Texas Instruments is the most direct substitute for the CS1613-FSZ. It maintains identical supply voltage range (11V to 18V), supports the same step-down/step-up topology, includes Triac dimming capability, and operates across the same temperature range (-40°C to 125°C). The part is active and RoHS3 compliant with superior moisture sensitivity (MSL 1 vs. MSL 3). Package transition from 16-SOIC to 8-SOIC requires PCB layout modification.

Secondary Substitute: TPS92074DDCR

The TPS92074DDCR offers compatible supply voltage range (11V to 18V) and operating temperature specifications. It maintains the same AC/DC offline switcher topology with step-down/step-up capability. This part is active and RoHS3 compliant. The SOT-23-6 thin package represents a significant footprint reduction and requires design adaptation. Dimming capability is not specified in the provided parameters.

Alternative Substitute: TPS92314AD/NOPB

The TPS92314AD/NOPB uses a Flyback topology rather than buck/boost, with a higher supply voltage range (13V to 35V). This part is active, RoHS3 compliant, and operates at the same temperature range. Topology difference requires circuit redesign. Dimming capability is not specified.

Limited Compatibility: MP4068GS

The MP4068GS from Monolithic Power Systems supports Triac dimming and buck/boost topology but operates at significantly lower supply voltages (4.1V to 5V), making it unsuitable for direct substitution in applications requiring 11V to 17V operation. This part is active and RoHS3 compliant but represents a different application class.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CS1613-FSZ with TPS92075D/NOPB without circuit modifications?

A: Electrical substitution is possible, but package change from 16-SOIC to 8-SOIC requires PCB layout redesign. Pin configuration must be verified against the respective datasheets before implementation.

Q: Why is TPS92075D/NOPB recommended over TPS92314AD/NOPB?

A: TPS92075D/NOPB maintains the same buck/boost topology as the original CS1613-FSZ and includes Triac dimming capability. TPS92314AD/NOPB uses Flyback topology without specified dimming support, requiring significant circuit redesign.

Q: Is MP4068GS a viable substitute?

A: No. MP4068GS operates at 4.1V to 5V supply range, which is incompatible with the CS1613-FSZ requirement of 11V to 17V. This part serves a different application class.

Q: What are the compliance differences between substitutes?

A: All active substitutes (TPS92075D/NOPB, TPS92074DDCR, TPS92314AD/NOPB, MP4068GS) are RoHS3 compliant. The original CS1613-FSZ has MSL 3 (168 hours), while all substitutes have MSL 1 or MSL 2, indicating superior moisture handling for storage and assembly.

Q: Does package size affect electrical performance?

A: Package size does not affect electrical performance but impacts thermal management and PCB layout. Smaller packages (8-SOIC, SOT-23-6) may require thermal design review for high-power applications.

Q: Are all substitutes rated for -40°C to 125°C operation?

A: TPS92075D/NOPB, TPS92074DDCR, and TPS92314AD/NOPB all support -40°C to 125°C. MP4068GS operating temperature is not specified in the provided parameters.