CS1615-FSZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1615-FSZ is an LED Driver IC manufactured by Cirrus Logic Inc., designed for AC DC offline switching applications with Flyback, Step-Down (Buck), and Step-Up (Boost) topologies. This component operates as a 1-output LED driver with Triac dimming capability, suitable for lighting applications across an operating temperature range of -40°C to 125°C.

The CS1615-FSZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for lighting systems utilizing this topology and feature set.

Key Parameters

Parameter	CS1615-FSZ
Manufacturer	Cirrus Logic Inc.
Category	Power Management (PMIC)
Product Status	Obsolete
Type	AC DC Offline Switcher
Topology	Flyback, Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	11V
Voltage - Supply (Max)	17V
Frequency	6kHz ~ 200kHz
Dimming	Triac
Applications	Lighting
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the CS1615-FSZ is determined by the following critical parameters:

Type & Topology: AC DC Offline Switcher with Flyback, Step-Down (Buck), and/or Step-Up (Boost) capability
Number of Outputs: Single output configuration
Dimming Method: Triac dimming support
Supply Voltage Range: Compatibility with 11V to 17V input range
Mounting Type: Surface Mount packages
Operating Temperature: Support for -40°C to 125°C minimum
Applications: Lighting-specific LED driver functionality

Substitute parts are grouped into two categories based on their alignment with these parameters:

Category A - Direct Topology Match (Flyback, Buck, Boost): LYT3325D-TL demonstrates the closest functional alignment, maintaining all three topologies (Flyback, Buck, Boost) with Triac dimming and surface mount packaging.

Category B - Partial Topology Match (Flyback Only): LNK407EG, LNK408LG, and LNK420LG provide Flyback topology with Triac or PWM dimming. These parts operate at higher supply voltages (36V–725V) and require circuit redesign considerations.

Category C - Simplified Topology (Flyback): IX9908NTR, TPS92314D/NOPB, and NCL30082DDR2G offer Flyback-only topology in compact 8-SOIC packages with lower supply voltage requirements (8.8V–35V).

Parameter Comparison

Parameter	CS1615-FSZ	LYT3325D-TL	LNK407EG	LNK408LG	LNK420LG	IX9908NTR	TPS92314D/NOPB	NCL30082DDR2G
Manufacturer	Cirrus Logic	Power Integrations	Power Integrations	Power Integrations	Power Integrations	IXYS	Texas Instruments	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
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	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Flyback, Buck, Boost	Flyback, Buck, Boost	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	11V	85VAC	36V	36V	36V	10.5V	13V	8.8V
Voltage - Supply (Max)	17V	132VAC	725V	725V	725V	18V	35V	20V
Dimming	Triac	Triac	Triac	Triac	PWM	—	—	Analog, PWM
Applications	Lighting	Lighting	Lighting	Lighting	Lighting	Lighting	Lighting	—
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-25°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount	Through Hole	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-SOIC	16-SOIC	eSIP-7C	eSIP-7F	eSIP-7F	8-SOIC	8-SOIC	8-SOIC
RoHS Status	—	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

LYT3325D-TL is the primary substitute candidate. It maintains identical topology support (Flyback, Buck, Boost), Triac dimming, surface mount 16-SOIC packaging, and MSL-3 moisture sensitivity matching. Operating temperature extends to 150°C. Supply voltage operates at 85VAC–132VAC, requiring input stage redesign for DC applications. Product status is Active with RoHS compliance.

LNK407EG, LNK408LG, and LNK420LG are secondary options for Flyback-only applications. These parts feature internal switches, higher supply voltage ranges (36V–725V), and improved operating temperature ratings (-40°C to 150°C). Mounting transitions from surface mount to through-hole eSIP packages. LNK407EG supports 1.77A output; LNK408LG supports 2.39A; LNK420LG supports 4.9A with PWM dimming. All are RoHS compliant with MSL-1 ratings. Circuit topology redesign is required.

IX9908NTR, TPS92314D/NOPB, and NCL30082DDR2G provide compact 8-SOIC surface mount alternatives for Flyback-only designs. Supply voltage ranges are compatible with low-voltage DC applications (8.8V–35V). IX9908NTR and TPS92314D/NOPB lack specified dimming capability. NCL30082DDR2G supports Analog and PWM dimming. All three are RoHS compliant. MSL ratings vary (1 or 3). These options require significant circuit simplification.

Selection should prioritize product status (Active preferred), compliance certifications (RoHS, REACH), and topology alignment with existing circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can LYT3325D-TL directly replace CS1615-FSZ without circuit modification?

A: LYT3325D-TL maintains the same topology support and Triac dimming capability in identical 16-SOIC packaging. However, supply voltage differs: CS1615-FSZ operates at 11V–17V DC, while LYT3325D-TL operates at 85VAC–132VAC. Input stage redesign is required for DC applications.

Q: Why do LNK407EG, LNK408LG, and LNK420LG require circuit redesign?

A: These parts operate at 36V–725V supply voltage, significantly higher than the CS1615-FSZ range of 11V–17V. Additionally, they transition from surface mount 16-SOIC to through-hole eSIP packages. Transformer design, feedback network, and PCB layout modifications are necessary.

Q: What is the difference between Triac and PWM dimming in these LED drivers?

A: Triac dimming interfaces with AC line-voltage dimmer switches for phase-cut control. PWM dimming uses pulse-width modulation for brightness control via digital signals. LNK420LG supports PWM dimming, while LNK407EG and LNK408LG support Triac dimming. Selection depends on the dimming interface available in the target application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry either RoHS or ROHS3 compliance certification. The original CS1615-FSZ RoHS status is not specified in available documentation.

Q: What does MSL-3 (168 Hours) mean for component handling?

A: MSL-3 indicates Moisture Sensitivity Level 3, requiring storage at ≤30% relative humidity and limiting floor-life to 168 hours (7 days) after moisture barrier bag opening. LYT3325D-TL and NCL30082DDR2G share this MSL-3 rating with CS1615-FSZ. LNK series and other alternatives feature MSL-1 (Unlimited), eliminating moisture-related handling constraints.

Q: Can I use an 8-SOIC package substitute in a 16-SOIC footprint?

A: No. Package footprints are not interchangeable. 8-SOIC and 16-SOIC differ in pin count, spacing, and PCB layout. Substitutes using different packages require PCB redesign and component placement modifications.

Q: Which substitute offers the best thermal performance?

A: LNK407EG, LNK408LG, and LNK420LG support operating temperatures to 150°C (TJ), compared to 125°C for CS1615-FSZ and most alternatives. This 25°C margin provides improved thermal headroom in high-ambient-temperature applications.

Q: Is inventory availability a factor in substitute selection?

A: Yes. NCL30082DDR2G has the highest inventory (20,200 pcs), followed by LYT3325D-TL (17,500 pcs) and LNK420LG (4,240 pcs). Inventory levels support long-term supply chain planning and production continuity.

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