CS1610A-FSZR LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1610A-FSZR is an AC DC offline switcher LED driver IC manufactured by Cirrus Logic Inc., designed for lighting applications with Triac dimming capability. This component features a Flyback topology with a single output and operates across a 11V to 17V supply voltage range in a 16-SOIC surface mount package.

The CS1610A-FSZR is classified as Obsolete, making it necessary to identify equivalent substitute parts for new designs or production continuity. Suitable alternatives must maintain compatibility with the core functional requirements: AC DC offline switching architecture, single output configuration, Triac dimming support, and similar operating temperature specifications.

Substiute Parts

CS1610A-FSZR

Cirrus Logic Inc.In Stock: 1234CS1610A-FSZR Datasheet

Current PartRFQ

NCL30185BDR2G

onsemiIn Stock: 7832NCL30185BDR2G Datasheet

MFR RecommendedRFQ

RT8458AGJ6

Richtek USA Inc.In Stock: 56124RT8458AGJ6 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CS1610A-FSZR are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Type: AC DC Offline Switcher architecture
• Number of Outputs: Single output configuration
• Applications: Lighting
• Operating Temperature Range: -40°C to 125°C (TJ)
• Mounting Type: Surface Mount
• Dimming Capability: Support for Triac or equivalent dimming methods

Secondary Considerations:

• Voltage Supply Range: Overlap or compatibility with 11V to 17V input specification
• Topology: Flyback or alternative topologies (SEPIC, Buck, Boost) that achieve equivalent functionality
• Package Type: Surface mount packages suitable for PCB integration
• Moisture Sensitivity Level: MSL 3 or better

The two identified substitutes—NCL30185BDR2G and RT8458AGJ6—meet these core criteria while offering different topology and dimming approaches to accommodate various design requirements.

Parameter Comparison

Engineering Selection Recommendations

NCL30185BDR2G (onsemi)

This substitute offers multi-topology flexibility (Flyback, SEPIC, Buck, Boost) with an extended voltage supply range of 8.8V to 25.5V, providing broader input compatibility than the original CS1610A-FSZR. The multi-step dimming method differs from Triac dimming but maintains lighting application suitability. The 8-SOIC package is more compact than the 16-SOIC original. Product status is Last Time Buy, indicating limited future availability. RoHS3 compliance and REACH Unaffected status support regulatory requirements.

RT8458AGJ6 (Richtek USA Inc.)

This substitute employs a Step-Down (Buck) topology with analog dimming and operates at a higher voltage range (17V to 31V), requiring circuit redesign if the original 11V minimum supply is critical. The TSOT-23-6 package offers the smallest footprint among the three options. Product status is Active, ensuring long-term availability and supply continuity. RoHS3 compliance and REACH Unaffected status meet current regulatory standards. Operating frequency is specified at 47kHz.

Selection Basis:

• For designs requiring closest functional alignment with Triac dimming and lower voltage operation: NCL30185BDR2G provides multi-topology support and extended supply range.
• For designs prioritizing long-term availability and compact packaging: RT8458AGJ6 offers Active product status and smallest form factor, with the trade-off of higher minimum supply voltage and different dimming architecture.

Frequently Asked Questions (FAQ)

Q: Can NCL30185BDR2G directly replace CS1610A-FSZR without circuit modifications?

A: NCL30185BDR2G maintains AC DC offline switcher architecture, single output, and lighting application focus. However, the multi-step dimming method differs from Triac dimming, and the 8-SOIC package differs from 16-SOIC. Circuit evaluation is required to confirm compatibility with your specific dimming control scheme and PCB layout constraints.

Q: What is the key difference between RT8458AGJ6 and the original CS1610A-FSZR?

A: RT8458AGJ6 uses Step-Down (Buck) topology versus Flyback, operates at higher voltage range (17V minimum versus 11V minimum), and employs analog dimming instead of Triac dimming. These differences require circuit redesign for applications dependent on the original specifications.

Q: Why does NCL30185BDR2G have a lower minimum supply voltage (8.8V) than CS1610A-FSZR (11V)?

A: The extended voltage range reflects the multi-topology capability of NCL30185BDR2G, which supports Flyback, SEPIC, Buck, and Boost configurations. This flexibility allows operation across a broader input voltage spectrum while maintaining lighting application performance.

Q: Is RT8458AGJ6 suitable for designs currently using Triac dimming?

A: RT8458AGJ6 uses analog dimming, which differs fundamentally from Triac dimming control. Designs dependent on Triac dimming compatibility require evaluation of whether analog dimming meets the application requirements, or alternative substitutes should be considered.

Q: What is the significance of product status (Obsolete, Last Time Buy, Active)?

A: Obsolete status (CS1610A-FSZR) indicates no further manufacturing or support. Last Time Buy (NCL30185BDR2G) indicates limited remaining inventory with a defined end-of-life date. Active status (RT8458AGJ6) ensures ongoing manufacturing and long-term supply availability for new designs.

Q: Are all three parts RoHS and REACH compliant?

A: CS1610A-FSZR compliance status is not specified in available data. NCL30185BDR2G and RT8458AGJ6 are both ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components in regulated markets.

Q: How do package differences affect PCB design?

A: CS1610A-FSZR uses 16-SOIC (0.154", 3.90mm width), NCL30185BDR2G uses 8-SOIC (0.154", 3.90mm width), and RT8458AGJ6 uses TSOT-23-6. Different pin counts and footprints require PCB layout redesign. The 8-SOIC and TSOT-23-6 packages offer reduced board space compared to 16-SOIC.