CS1612-FSZR LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1612-FSZR is an LED driver IC manufactured by Cirrus Logic Inc., designed for AC/DC offline switching applications with triac dimming capability. This component operates as a step-down/step-up (buck/boost) converter in a 16-SOIC package, supporting lighting applications across an operating temperature range of -40°C to 125°C.

The CS1612-FSZR is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Substiute Parts

CS1612-FSZR

Cirrus Logic Inc.In Stock: 1089CS1612-FSZR Datasheet

Current PartRFQ

LT3799IMSE#PBF

Analog Devices Inc.In Stock: 2589LT3799IMSE#PBF Datasheet

MFR RecommendedRFQ

MP4026GJ-P

Monolithic Power SystemsIn Stock: 1295MP4026GJ-P Datasheet

MFR RecommendedRFQ

TPS92075DR/NOPB

Texas InstrumentsIn Stock: 2325TPS92075DR/NOPB Datasheet

MFR RecommendedRFQ

TS19320CS RLG

Taiwan Semiconductor CorporationIn Stock: 1106TS19320CS RLG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS1612-FSZR is determined by the following critical parameters:

• Type: AC DC Offline Switcher (all substitutes must match)
• Dimming Capability: Triac dimming support (required for lighting control compatibility)
• Number of Outputs: Single output configuration (required)
• Voltage Supply Range: Minimum 11V operation (all substitutes must support this threshold)
• Mounting Type: Surface mount technology (all substitutes must match)
• Operating Temperature Range: -40°C to 125°C junction temperature (all substitutes must support or exceed this range)
• Package Compatibility: Physical footprint and pin configuration must be compatible with PCB layout

Substitute parts are grouped based on topology variations (Flyback vs. Buck/Boost) and package form factors, which affect circuit design implementation but maintain functional equivalence for LED driver applications.

Parameter Comparison

Engineering Selection Recommendations

LT3799IMSE#PBF (Analog Devices Inc.): Active product status with ROHS3 compliance and MSL 1 rating. Supports triac dimming and operates across the required -40°C to 125°C temperature range. Flyback topology requires circuit redesign compared to the original buck/boost configuration. Package footprint differs (16-TFSOP vs. 16-SOIC), necessitating PCB layout modification.

MP4026GJ-P (Monolithic Power Systems): Active product with ROHS3 compliance and MSL 1 rating. Operates within extended voltage range (9.8V to 27V), exceeding the CS1612-FSZR minimum requirement. Flyback topology implementation differs from the original design. Significant package change to SOT-23-6 requires substantial PCB redesign. Dimming capability not specified in available parameters.

TPS92075DR/NOPB (Texas Instruments): Active product with ROHS3 compliance and MSL 1 rating. Maintains buck/boost topology matching the original CS1612-FSZR architecture. Supports triac dimming and operates across -40°C to 125°C temperature range. Voltage supply range (11V to 18V) closely aligns with the original specification. Package reduction to 8-SOIC requires PCB layout adjustment but maintains SOIC form factor compatibility.

TS19320CS RLG (Taiwan Semiconductor Corporation): Active product with ROHS3 compliance. Supports flexible topology options (Flyback, Buck/Boost) and triac dimming. Extended voltage range (7.8V to 40V) provides design margin. Operating temperature limited to -40°C to 85°C (TA), below the original -40°C to 125°C (TJ) specification. MSL 3 rating matches the original component. Package maintains 8-SOIC form factor.

Frequently Asked Questions (FAQ)

Q: Can the LT3799IMSE#PBF directly replace the CS1612-FSZR without circuit modification?

A: No. While both are AC/DC offline switchers with triac dimming support, the LT3799IMSE#PBF uses flyback topology versus the CS1612-FSZR's buck/boost topology. This requires transformer and feedback network redesign. Additionally, the package changes from 16-SOIC to 16-TFSOP, necessitating PCB layout modification.

Q: Which substitute offers the closest functional match to the CS1612-FSZR?

A: The TPS92075DR/NOPB maintains the buck/boost topology of the original part and supports identical triac dimming and temperature range specifications. The primary design change involves package reduction from 16-SOIC to 8-SOIC, which may reduce PCB footprint but requires layout adjustment.

Q: Does the MP4026GJ-P support triac dimming?

A: Triac dimming capability is not specified in the available technical parameters for the MP4026GJ-P. Verification with the manufacturer datasheet is necessary before selection for dimming-dependent applications.

Q: What is the impact of MSL rating differences between the CS1612-FSZR and substitute parts?

A: The CS1612-FSZR and TS19320CS RLG both carry MSL 3 (168 Hours) ratings, requiring controlled moisture exposure during storage and handling. The LT3799IMSE#PBF, MP4026GJ-P, and TPS92075DR/NOPB carry MSL 1 (Unlimited) ratings, allowing extended shelf life without moisture control. MSL 1 components provide manufacturing flexibility and reduced storage constraints.

Q: Is the TS19320CS RLG suitable for applications requiring -40°C to 125°C operation?

A: The TS19320CS RLG specifies -40°C to 85°C (TA) ambient temperature operation, which does not meet the CS1612-FSZR's -40°C to 125°C (TJ) junction temperature requirement. This part is suitable only for applications with maximum ambient temperatures below 85°C.

Q: What are the voltage supply compatibility considerations for substitution?

A: The CS1612-FSZR operates from 11V to 17V. The TPS92075DR/NOPB (11V to 18V) and TS19320CS RLG (7.8V to 40V) both support this range. The MP4026GJ-P (9.8V to 27V) operates below the 11V minimum but provides extended upper range. Circuit design must account for actual supply voltage distribution in the target application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The LT3799IMSE#PBF, MP4026GJ-P, and TPS92075DR/NOPB are all ROHS3 compliant. The TS19320CS RLG is also ROHS3 compliant. All parts meet current environmental and regulatory requirements.