CS1613A-FSZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1613A-FSZ is an AC DC offline switcher LED driver IC manufactured by Cirrus Logic Inc., designed for lighting applications with Triac dimming capability. This device operates with a supply voltage range of 11V to 17V and features a step-down (buck) topology in a 16-SOIC package. The part is currently obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

CS1613A-FSZ

Cirrus Logic Inc.In Stock: 786CS1613A-FSZ Datasheet

Current PartRFQ

AL1697-20CS7-13

Diodes IncorporatedIn Stock: 60403AL1697-20CS7-13 Datasheet

MFR RecommendedRFQ

AL9902FDF-13

Diodes IncorporatedIn Stock: 1068AL9902FDF-13 Datasheet

MFR RecommendedRFQ

LM3497MX/NOPB

Texas InstrumentsIn Stock: 98909LM3497MX/NOPB Datasheet

MFR RecommendedRFQ

MP4032-2GS-Z

Monolithic Power Systems Inc.In Stock: 35483MP4032-2GS-Z Datasheet

MFR RecommendedRFQ

MP4068GS

Monolithic Power SystemsIn Stock: 966MP4068GS Datasheet

MFR RecommendedRFQ

MP4088GJ-P

Monolithic Power Systems Inc.In Stock: 1126MP4088GJ-P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS1613A-FSZ is determined by the following critical parameters:

• Type: AC DC Offline Switcher
• Topology: Step-Down (Buck) or compatible multi-topology designs
• Dimming Method: Triac dimming capability
• Number of Outputs: Single output
• Supply Voltage Range: Compatibility with 11V to 17V input or overlapping range
• Applications: Lighting-specific designs
• Operating Temperature: -40°C to 125°C or equivalent thermal range
• Package Compatibility: Surface mount packages suitable for board integration

Substitute parts are grouped into two categories based on topology and feature set:

Category 1 - Buck Topology with Triac Dimming (Direct Substitutes)

• LM3497MX/NOPB: Buck topology, Triac dimming, active product status

Category 2 - Multi-Topology (Buck/Boost) with Triac Dimming (Functional Equivalents)

• AL1697-20CS7-13: Buck/Boost topology, Triac dimming, internal switch, active status
• MP4032-2GS-Z: Buck/Boost topology, Triac dimming, internal switch, active status
• MP4088GJ-P: Buck/Boost topology, Triac dimming, internal switch, active status

Category 3 - Advanced Topology with PWM/Analog Dimming

• AL9902FDF-13: Buck/Boost topology, PWM/Analog dimming, higher frequency operation, active status

Parameter Comparison

Engineering Selection Recommendations

For Direct Topology Match (Buck-Only Designs)

The LM3497MX/NOPB from Texas Instruments is the closest functional equivalent, maintaining buck-only topology and Triac dimming identical to the CS1613A-FSZ. This part is active and ROHS3 compliant with unlimited MSL rating. However, the supply voltage range is narrower (8V to 12V) compared to the original part (11V to 17V), requiring circuit verification for applications operating above 12V. The 14-SOIC package differs from the original 16-SOIC, necessitating PCB layout modifications.

For Enhanced Functionality (Multi-Topology Designs)

The AL1697-20CS7-13, MP4032-2GS-Z, and MP4088GJ-P offer buck/boost topology with integrated switches, providing design flexibility beyond the original buck-only architecture. All three are active products with ROHS3 compliance. The AL1697-20CS7-13 and MP4088GJ-P feature unlimited MSL ratings, while MP4032-2GS-Z has a 1-year MSL rating. Package options range from 8-SOIC to SOT-23-5, requiring board redesign. Supply voltage ranges vary: AL1697-20CS7-13 (8.5V to 18V), MP4032-2GS-Z (10.3V to 27V), and MP4088GJ-P (4.5V to 5V).

For Advanced Dimming Requirements (PWM/Analog Capable)

The AL9902FDF-13 from Diodes Incorporated supports both PWM and analog dimming in addition to Triac dimming, operating at 300kHz with 400mA output current. This part is active and ROHS3 compliant but operates at higher supply voltages (20V to 500V), making it suitable only for applications requiring extended voltage range. The 12-UDFN package represents a significant footprint reduction compared to the original 16-SOIC.

Compliance and Availability

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching regulatory requirements. Inventory availability is strong across all options, with LM3497MX/NOPB showing the highest stock level (98,817 pcs).

Frequently Asked Questions (FAQ)

Q: Can the LM3497MX/NOPB directly replace the CS1613A-FSZ without circuit modifications?

A: The LM3497MX/NOPB maintains identical topology (buck) and dimming method (Triac), but the supply voltage range differs. The original part operates 11V to 17V, while the LM3497MX/NOPB operates 8V to 12V. Applications requiring operation above 12V require circuit redesign. Additionally, the package changes from 16-SOIC to 14-SOIC, requiring PCB layout modifications.

Q: What is the primary advantage of multi-topology (buck/boost) substitutes over the original buck-only design?

A: Multi-topology parts such as AL1697-20CS7-13, MP4032-2GS-Z, and MP4088GJ-P provide design flexibility by supporting both step-down and step-up conversion within a single IC. This enables broader application coverage and simplified circuit design for applications requiring voltage regulation in either direction. However, circuit validation is necessary to confirm compatibility with existing designs optimized for buck-only operation.

Q: Are package changes between substitutes critical to the selection process?

A: Yes. The CS1613A-FSZ uses a 16-SOIC package, while substitutes range from 8-SOIC to SOT-23-5 to 12-UDFN. Package changes require PCB redesign, including trace routing, thermal management considerations, and component placement. Smaller packages like SOT-23-5 reduce board area but may impact thermal performance in high-power applications.

Q: Which substitute offers the best MSL (Moisture Sensitivity Level) rating?

A: The LM3497MX/NOPB, AL1697-20CS7-13, and MP4088GJ-P all feature MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. The original CS1613A-FSZ and AL9902FDF-13 both carry MSL 3 (168 hours), requiring controlled storage conditions. MP4032-2GS-Z carries MSL 2 (1 Year).

Q: Is the AL9902FDF-13 suitable as a direct replacement for standard Triac dimming applications?

A: The AL9902FDF-13 supports Triac dimming but operates at significantly higher supply voltages (20V to 500V) compared to the original part (11V to 17V). This part is designed for applications requiring extended voltage range and advanced dimming capabilities (PWM/Analog). Use this substitute only when the higher voltage range and additional dimming features align with application requirements.

Q: What thermal operating range should be considered when selecting a substitute?

A: The CS1613A-FSZ operates -40°C to 125°C (junction temperature). The LM3497MX/NOPB and MP4032-2GS-Z maintain this range. The AL1697-20CS7-13 and AL9902FDF-13 operate -40°C to 105°C (ambient temperature), which may be limiting for high-temperature applications. Verify thermal requirements for your specific application before selection.