TS19450CS RLG LED Driver IC Equivalent & Substitute Parts

Part Overview

The TS19450CS RLG is an AC DC Offline Switcher LED Driver IC manufactured by Taiwan Semiconductor Corporation, designed for single-output applications in backlight, lighting, and signage systems. This device features analog and PWM dimming capabilities with a step-down (buck) topology and operates across a wide supply voltage range of 8V to 450V.

The TS19450CS RLG is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring similar functional performance.

Key Parameters

Parameter	TS19450CS RLG
Manufacturer	Taiwan Semiconductor Corporation
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	8V
Voltage - Supply (Max)	450V
Dimming	Analog, PWM
Internal Switch(s)	No
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TS19450CS RLG are selected based on the following critical parameters that determine functional compatibility:

Primary Selection Criteria:

Type: AC DC Offline Switcher
Number of Outputs: 1
Dimming Capability: Analog, PWM, or Triac
Operating Temperature Range: Minimum -40°C capability
RoHS Compliance: ROHS3 or RoHS Compliant
Package Compatibility: Surface Mount or Through Hole configurations

Secondary Compatibility Factors:

Voltage Supply Range: Overlap with 8V to 450V range
Topology: Step-Down (Buck), Flyback, or multi-topology support
Internal Switch Configuration: With or without integrated switches
Mounting and Packaging: 8-SOIC, SOT-23-6, or eSIP packages

The substitute parts listed below meet these criteria with varying degrees of parameter alignment. Each substitute maintains the core function of LED driver operation in offline AC DC applications while offering different topology options, dimming methods, and thermal characteristics.

Parameter Comparison

Parameter	TS19450CS RLG	TS19705CX6 RFG	FL7733AMX	LNK404LG	LNK418EG	LYT2004E	MP4032-2GS-Z	RT7320GSP
Manufacturer	Taiwan Semiconductor	Taiwan Semiconductor	onsemi	Power Integrations	Power Integrations	Power Integrations	Monolithic Power Systems	Richtek USA Inc.
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	Offline Flyback Converter	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Step-Down (Buck)	Flyback, Step-Down (Buck), Step-Up (Boost)	Flyback, Step-Down (Buck), Step-Up (Boost)	Flyback	Flyback	Flyback	Step-Down (Buck), Step-Up (Boost)	Not Specified
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	8V	9.5V	Not Specified	36V	36V	Not Specified	10.3V	0V
Voltage - Supply (Max)	450V	40V	30V	725V	725V	725V	27V	100V
Dimming	Analog, PWM	Not Specified	Analog	Triac	PWM	Not Specified	Triac	Not Specified
Internal Switch(s)	No	No	No	Yes	Yes	Yes	Yes	Yes
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	SOT-23-6	8-SOIC (0.154", 3.90mm Width)	7-SSIP, 6 Leads, Exposed Pad	7-SSIP, 6 Leads, Exposed Pad	7-SSIP, 6 Leads, Exposed Pad	8-SOIC (0.154", 3.90mm Width), 7 Leads	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole	Through Hole	Through Hole	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Manufacturer Recommended Substitute: TS19705CX6 RFG

The TS19705CX6 RFG is the manufacturer-recommended equivalent from Taiwan Semiconductor Corporation. This part maintains the same manufacturer lineage as the TS19450CS RLG and is classified as Active product status, ensuring ongoing availability and support. Both devices are ROHS3 compliant and share identical RoHS and REACH certifications. The TS19705CX6 RFG supports multiple topologies (Flyback, Step-Down, Step-Up) and operates within a reduced but overlapping voltage range (9.5V to 40V). This substitute is suitable for applications where the lower maximum supply voltage is acceptable.

Surface Mount Package Alternatives:

FL7733AMX (onsemi) and RT7320GSP (Richtek) maintain the 8-SOIC surface mount package format identical to the TS19450CS RLG. The FL7733AMX is Active status with ROHS3 compliance and supports analog dimming across -40°C to 125°C. The RT7320GSP is Obsolete status but offers the widest voltage range (0V to 100V) among surface mount options. Both preserve PCB layout compatibility with the original design.

Through Hole Package Alternatives:

LNK418EG and LNK404LG (Power Integrations) offer integrated internal switches and operate across the full 36V to 725V range, exceeding the original part's maximum voltage capability. Both maintain -40°C to 150°C operating temperature matching the TS19450CS RLG. LNK418EG supports PWM dimming with 2.39A output current, while LNK404LG supports Triac dimming with 1.02A output current. These parts require PCB redesign due to eSIP-7 package format.

LYT2004E (Power Integrations) is a Flyback topology converter with integrated switch, 85kHz switching frequency, and 10W power rating. It operates at -40°C to 150°C and is RoHS compliant, suitable for isolated output applications.

MP4032-2GS-Z (Monolithic Power Systems) maintains 8-SOIC surface mount packaging with integrated switch, supporting Triac dimming across -40°C to 125°C and 10.3V to 27V supply range.

Product Status Considerations:

The TS19450CS RLG is Obsolete. All substitute parts except RT7320GSP are classified as Active, ensuring long-term supply chain viability. For new designs or production continuity, Active status substitutes are preferred. RT7320GSP, also Obsolete, should be avoided for new applications.

Compliance and Certification:

All recommended substitutes maintain ROHS3 or RoHS compliance and REACH Unaffected status, matching the original part's regulatory requirements. No additional compliance verification is required for substitution in existing applications.

Frequently Asked Questions (FAQ)

Q: Can the TS19705CX6 RFG directly replace the TS19450CS RLG without PCB modifications?

A: The TS19705CX6 RFG uses a SOT-23-6 package, while the TS19450CS RLG uses 8-SOIC. Direct PCB replacement is not possible without layout redesign. However, the TS19705CX6 RFG is the manufacturer-recommended functional equivalent and supports the same dimming methods (though dimming capability is not specified in the datasheet parameters provided).

Q: What is the primary difference between the TS19450CS RLG and LNK418EG?

A: The TS19450CS RLG is a step-down (buck) topology without internal switch, while the LNK418EG is a flyback topology with integrated internal switch. The LNK418EG operates at higher voltage ranges (36V to 725V) and includes 2.39A output current capability. The LNK418EG requires through-hole mounting (eSIP-7C package) versus surface mount for the original part.

Q: Which substitute maintains identical package compatibility with the TS19450CS RLG?

A: The FL7733AMX (onsemi) and RT7320GSP (Richtek) both use 8-SOIC packages matching the TS19450CS RLG footprint. The FL7733AMX is Active status with current availability, while RT7320GSP is Obsolete. For new designs, FL7733AMX is the preferred surface mount package-compatible option.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are either ROHS3 Compliant or RoHS Compliant, matching the regulatory status of the TS19450CS RLG. All parts maintain REACH Unaffected status.

Q: What is the operating temperature range difference between the TS19450CS RLG and its substitutes?

A: The TS19450CS RLG operates at -40°C to 150°C (junction temperature). Most substitutes operate within this range or narrower ranges: TS19705CX6 RFG (-40°C to 85°C), FL7733AMX (-40°C to 125°C), LNK404LG and LNK418EG (-40°C to 150°C), LYT2004E (-40°C to 150°C), MP4032-2GS-Z (-40°C to 125°C), and RT7320GSP (-40°C to 85°C). Applications requiring full -40°C to 150°C range should select LNK404LG, LNK418EG, or LYT2004E.

Q: Can I use a substitute with a different dimming method?

A: Dimming method substitution depends on system design. The TS19450CS RLG supports Analog and PWM dimming. Substitutes offer different dimming options: TS19705CX6 RFG (not specified), FL7733AMX (Analog), LNK404LG (Triac), LNK418EG (PWM), LYT2004E (not specified), MP4032-2GS-Z (Triac), and RT7320GSP (not specified). Select substitutes matching your required dimming method or verify compatibility with your control circuitry.

Q: What is the voltage supply range overlap between the TS19450CS RLG and available substitutes?

A: The TS19450CS RLG operates at 8V to 450V. Overlapping ranges: TS19705CX6 RFG (9.5V to 40V), FL7733AMX (up to 30V), MP4032-2GS-Z (10.3V to 27V), and RT7320GSP (0V to 100V). LNK404LG, LNK418EG, and LYT2004E operate at 36V to 725V, exceeding the original maximum. For applications requiring the full 8V to 450V range, no direct substitute maintains identical voltage specifications.

Q: Which substitute offers the best inventory availability?

A: Based on provided inventory data, MP4032-2GS-Z has the highest stock level at 35,400 pieces, followed by FL7733AMX at 40,200 pieces. LNK418EG has 16,244 pieces, TS19705CX6 RFG has 12,881 pieces, and LYT2004E has 1,900 pieces. Inventory levels should be verified with current suppliers for real-time availability.

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