CS1612A-FSZR LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1612A-FSZR is an AC DC offline switcher LED driver IC manufactured by Cirrus Logic Inc., designed for lighting applications with triac dimming capability. This 16-SOIC surface mount component operates across a 11V to 17V supply range with step-down (buck) topology and a single output configuration. The part is currently obsolete, making equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	CS1612A-FSZR
Manufacturer	Cirrus Logic Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage Supply Range	11V to 17V
Dimming Type	Triac
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C (TJ)
Product Status	Obsolete
Applications	Lighting

Substitute Part Grouping Explanation

Substitution for the CS1612A-FSZR is determined by the following critical parameters: AC DC offline switcher topology, single output configuration, triac dimming capability, and surface mount packaging. The substitute parts are grouped based on functional equivalence within these constraints.

Primary Substitution Criteria:

Type: AC DC Offline Switcher
Dimming: Triac
Number of Outputs: 1
Mounting Type: Surface Mount
Applications: Lighting

Substitute parts may vary in topology (flyback, buck-boost combinations), supply voltage ranges, package configurations, and thermal specifications, provided they maintain triac dimming functionality and single-output architecture suitable for lighting applications.

Parameter Comparison

Parameter	CS1612A-FSZR	AL9910A-5SP-13	LYT3326D-TL	MP4068GS-Z	TPS92314DR/NOPB	UCC28811DR
Manufacturer	Cirrus Logic	Diodes Inc.	Power Integrations	Monolithic Power	Texas Instruments	Texas Instruments
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Step-Down (Buck)	Step-Down (Buck), Step-Up (Boost)	Flyback, Step-Down (Buck), Step-Up (Boost)	Step-Down (Buck), Step-Up (Boost)	Flyback	Flyback, Step-Down (Buck), Step-Up (Boost)
Dimming	Triac	Analog, PWM	Triac	Triac	—	Triac
Number of Outputs	1	1	1	1	1	1
Voltage Supply (Min)	11V	20V	85VAC	4.1V	13V	—
Voltage Supply (Max)	17V	500V	132VAC	5V	35V	18V
Package / Case	16-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm) Exposed Pad	16-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C to 125°C (TJ)	-40°C to 105°C (TA)	-40°C to 150°C (TJ)	—	-40°C to 125°C (TJ)	-40°C to 105°C (TA)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AL9910A-5SP-13 (Diodes Incorporated): Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Supports extended supply voltage range (20V to 500V) with buck-boost topology and dual dimming modes (analog and PWM). Package footprint differs from original (8-SOIC versus 16-SOIC), requiring PCB layout modification. Operating temperature range extends to 105°C.

LYT3326D-TL (Power Integrations): Active product with RoHS compliance and triac dimming matching the original specification. Supports AC supply input (85VAC to 132VAC) with integrated internal switch and multi-topology configuration (flyback, buck, boost). Maintains 16-SOIC package compatibility. Operating temperature extends to 150°C. Moisture sensitivity level matches original (MSL 3).

MP4068GS-Z (Monolithic Power Systems): Active product with ROHS3 compliance and unlimited moisture sensitivity. Compact 8-SOIC package with triac dimming and buck-boost topology. Supply voltage range (4.1V to 5V) differs significantly from original, limiting direct substitution applicability. High inventory availability (276,700 units).

TPS92314DR/NOPB (Texas Instruments): Active product with ROHS3 compliance and unlimited moisture sensitivity. Flyback topology with 13V to 35V supply range. Lacks explicit triac dimming specification. 8-SOIC package requires layout modification. Operating temperature matches original (125°C).

UCC28811DR (Texas Instruments): Active product with ROHS3 compliance and unlimited moisture sensitivity. Supports triac dimming with multi-topology configuration (flyback, buck, boost). Supply voltage maximum of 18V aligns with original range. 8-SOIC package requires layout modification. Operating temperature range to 105°C.

Frequently Asked Questions (FAQ)

Q: Why is the CS1612A-FSZR obsolete, and what are the implications? A: The CS1612A-FSZR is classified as obsolete by Cirrus Logic Inc., meaning it is no longer manufactured or supported. Existing inventory may be limited, and long-term availability cannot be guaranteed. Designs using this component should transition to active substitute parts to ensure production continuity and future supply chain stability.

Q: What is the primary difference between triac dimming and PWM dimming? A: Triac dimming controls LED brightness by modulating the AC line voltage phase angle, suitable for AC-powered lighting systems. PWM (pulse-width modulation) dimming controls brightness by rapidly switching the output on and off at a fixed frequency. The CS1612A-FSZR uses triac dimming; substitutes with PWM-only capability may require circuit redesign.

Q: Can I use an 8-SOIC package substitute in place of the 16-SOIC original? A: Package substitution requires PCB layout modification. The 8-SOIC and 16-SOIC packages have different pin counts and physical dimensions. Pin-to-pin functional mapping must be verified, and the PCB footprint must be redesigned accordingly. Electrical functionality does not guarantee mechanical compatibility.

Q: What does "AC DC Offline Switcher" mean? A: An AC DC offline switcher is a power conversion IC that operates directly from AC mains voltage without requiring a separate AC-DC rectifier stage. It integrates switching control and protection functions for direct AC input applications, commonly used in lighting and low-power consumer electronics.

Q: How do supply voltage ranges affect substitution? A: The CS1612A-FSZR operates at 11V to 17V. Substitute parts with significantly different voltage ranges (such as MP4068GS-Z at 4.1V to 5V) are not directly compatible without circuit redesign. Voltage range overlap is necessary for drop-in substitution without additional power conditioning.

Q: What is the significance of RoHS and ROHS3 compliance? A: RoHS (Restriction of Hazardous Substances) compliance indicates the component meets environmental regulations restricting lead, mercury, cadmium, and other hazardous materials. ROHS3 is the current standard. All active substitute parts listed are RoHS or ROHS3 compliant, ensuring regulatory alignment with modern manufacturing standards.

Q: Does operating temperature range affect my design? A: Operating temperature range defines the thermal environment in which the component functions reliably. The CS1612A-FSZR operates to 125°C (junction temperature). Substitutes with extended ranges (such as LYT3326D-TL to 150°C) provide additional thermal margin but do not require design changes if your application operates within the original range.

Q: What is moisture sensitivity level (MSL), and why does it matter? A: MSL indicates how long a component can be exposed to moisture before soldering without degradation. MSL 3 (168 hours) requires more careful handling than MSL 1 (unlimited). The CS1612A-FSZR and LYT3326D-TL both specify MSL 3, while most active substitutes offer MSL 1, reducing manufacturing process constraints.

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