IRS2541STRPBF LED Driver Controller Equivalent & Substitute Parts

Part Overview

The IRS2541STRPBF is an LED Driver IC manufactured by Infineon Technologies, classified as a Power Management (PMIC) device. This single-output DC DC controller implements a step-down (buck) topology with PWM dimming capability, operating at 500kHz frequency. The device is rated for supply voltages between 9V and 15.6V with an operating temperature range of -25°C to 150°C (TJ). The IRS2541STRPBF is currently listed as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer	Infineon Technologies
Part Number	IRS2541STRPBF
Product Status	Obsolete
Category	Power Management (PMIC)
Type	DC DC Controller
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage Supply (Min)	9V
Voltage Supply (Max)	15.6V
Frequency	500kHz
Dimming	PWM
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-25°C ~ 150°C (TJ)
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution for the IRS2541STRPBF is determined by the following critical parameters:

Topology: Step-Down (Buck) configuration
Number of Outputs: Single output (1)
Dimming Method: PWM capability
Package Type: 8-SOIC form factor preferred for direct PCB compatibility
Supply Voltage Range: Minimum 8V to 9V; Maximum 15.6V to 16.6V acceptable
Frequency: 500kHz nominal operation
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories:

Category 1 - Direct Package Compatibility (8-SOIC): Parts maintaining the same 8-SOIC package footprint with compatible electrical specifications. These include IRS25411STRPBF, HV9930LG-G, and MP4008GS.

Category 2 - Functional Equivalence (Alternative Packages): Parts with compatible topologies and electrical performance but different package types. These include HV9910BNG-G-M901 (16-SOIC), HV9961NG-G-M934 (16-SOIC), LT3755IMSE-2#TRPBF (16-MSOP), IS31LT3354-STLS2-TR (SOT-23-5), LT3763IFE#TRPBF (28-TSSOP), and LT3796EFE-1#TRPBF (28-TSSOP).

Category 3 - Extended Functionality: Parts with enhanced topologies (SEPIC, Boost, or multi-topology support) and broader voltage ranges. These include ASL4500SHNY (32-HVQFN, 4-output boost regulator) and LT3755IMSE-2#TRPBF (multi-topology support).

Parameter Comparison

Part Number	Manufacturer	Type	Topology	Outputs	V Supply Min	V Supply Max	Frequency	Dimming	Package	Temp Range	Status
IRS2541STRPBF	Infineon	DC DC Controller	Buck	1	9V	15.6V	500kHz	PWM	8-SOIC	-25°C ~ 150°C	Obsolete
IRS25411STRPBF	Infineon	DC DC Controller	Buck	1	8V	16.6V	500kHz	PWM	8-SOIC	-25°C ~ 125°C	Active
HV9930LG-G	Microchip	DC DC Controller	Buck, Boost	1	8V	200V	—	PWM	8-SOIC	-40°C ~ 125°C	Active
HV9910BNG-G-M901	Microchip	DC DC Controller	Buck	1	8V	450V	25kHz, 100kHz	Analog, PWM	16-SOIC	-40°C ~ 125°C	Active
HV9961NG-G-M934	Microchip	DC DC Controller	Buck	1	8V	450V	—	Analog, PWM	16-SOIC	-40°C ~ 125°C	Active
IS31LT3354-STLS2-TR	Lumissil	DC DC Controller	Buck	1	6V	40V	1MHz	Analog, PWM	SOT-23-5	-40°C ~ 85°C	Active
LT3755IMSE-2#TRPBF	Analog Devices	DC DC Controller	Flyback, SEPIC, Buck, Boost	1	4.5V	40V	100kHz ~ 1MHz	Analog, PWM	16-MSOP-EP	-40°C ~ 125°C	Active
LT3763IFE#TRPBF	Analog Devices	DC DC Controller	Buck	1	6V	60V	200kHz ~ 1MHz	PWM	28-TSSOP-EP	-40°C ~ 125°C	Active
LT3796EFE-1#TRPBF	Analog Devices	DC DC Controller	SEPIC, Buck, Boost	1	6V	100V	100kHz ~ 1MHz	Analog, PWM	28-TSSOP-EP	-40°C ~ 125°C	Active
MP4008GS	Monolithic Power Systems	DC DC Controller	Boost, SEPIC	1	9V	28V	180kHz	PWM	8-SOIC	-40°C ~ 125°C	Active
ASL4500SHNY	NXP Semiconductors	DC DC Regulator	Boost	4	5.5V	40V	130MHz ~ 250MHz	—	32-HVQFN	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation - IRS25411STRPBF: This Infineon part is the closest functional equivalent to the obsolete IRS2541STRPBF. Both devices share identical topology (step-down buck), single output configuration, PWM dimming, 500kHz frequency, and 8-SOIC package. The IRS25411STRPBF is currently active with ROHS3 compliance and maintains backward compatibility with existing PCB layouts. Supply voltage range extends from 8V to 16.6V, providing slightly broader input tolerance than the original 9V to 15.6V specification. Operating temperature maximum is reduced to 125°C (TJ) compared to the original 150°C, which may require thermal review in high-temperature applications.

Secondary Recommendation - HV9930LG-G: This Microchip device maintains 8-SOIC package compatibility and PWM dimming capability. The HV9930LG-G supports both buck and boost topologies with a significantly extended supply voltage range (8V to 200V), offering design flexibility for future applications. Product status is active with ROHS3 compliance and unlimited moisture sensitivity rating. This part is suitable when circuit topology flexibility is required.

Alternative for Space-Constrained Designs - IS31LT3354-STLS2-TR: The Lumissil part offers the smallest package footprint (SOT-23-5) with active product status and ROHS3 compliance. This device supports both analog and PWM dimming with 1MHz frequency operation. Supply voltage range is 6V to 40V. Automotive-grade qualification (AEC-Q100) is available. Operating temperature range is limited to -40°C to 85°C (TA), which may restrict use in high-temperature environments.

Extended Functionality Options: For applications requiring multi-topology support or higher frequency operation, LT3755IMSE-2#TRPBF (Analog Devices, 16-MSOP, 100kHz-1MHz, multi-topology) and LT3796EFE-1#TRPBF (Analog Devices, 28-TSSOP, 100kHz-1MHz, SEPIC/Buck/Boost) provide enhanced capabilities with active status and ROHS3 compliance.

Not Recommended for Direct Substitution: ASL4500SHNY is a 4-output boost regulator with 32-HVQFN package and fundamentally different architecture (multi-output, boost-only topology). This part is suitable only for new designs with different functional requirements, not as a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can IRS25411STRPBF directly replace IRS2541STRPBF on existing PCBs?

A: Yes. Both parts use identical 8-SOIC package footprint and pinout. Electrical specifications are compatible within the overlapping supply voltage range (9V to 15.6V). The IRS25411STRPBF operates at the same 500kHz frequency with PWM dimming. Verify that your application does not require operation above 125°C (TJ), as the IRS25411STRPBF maximum is 125°C versus the original 150°C.

Q: What is the key difference between HV9930LG-G and IRS25411STRPBF?

A: Both maintain 8-SOIC package compatibility and PWM dimming. The HV9930LG-G supports dual topology (buck and boost) with extended supply voltage range (8V to 200V) versus the IRS25411STRPBF single buck topology (8V to 16.6V). Frequency specification is not provided for HV9930LG-G. Select HV9930LG-G when circuit topology flexibility is required; select IRS25411STRPBF for direct replacement with specified 500kHz operation.

Q: Why do some substitute parts have different package types?

A: Package diversity reflects different design approaches and manufacturing strategies across semiconductor manufacturers. Parts in 16-SOIC, 28-TSSOP, and 16-MSOP packages offer equivalent or enhanced electrical functionality but require PCB layout redesign. These alternatives are suitable for new designs or when PCB redesign is acceptable. For minimal redesign effort, prioritize 8-SOIC package options (IRS25411STRPBF, HV9930LG-G, MP4008GS).

Q: Is the IS31LT3354-STLS2-TR suitable for high-temperature applications?

A: No. The IS31LT3354-STLS2-TR operating temperature range is -40°C to 85°C (TA), which is lower than the original IRS2541STRPBF specification (-25°C to 150°C TJ). This part is suitable for standard industrial and consumer applications but not for high-temperature environments. For high-temperature requirements, select IRS25411STRPBF (-25°C to 125°C TJ) or verify thermal requirements against alternative parts.

Q: What does "PWM Dimming" mean in the context of LED driver selection?

A: PWM (Pulse Width Modulation) dimming controls LED brightness by varying the duty cycle of the output signal while maintaining constant frequency. All recommended substitutes support PWM dimming, ensuring compatibility with existing dimming control circuits. Some alternatives (HV9910BNG-G-M901, HV9961NG-G-M934, LT3755IMSE-2#TRPBF, LT3796EFE-1#TRPBF) also support analog dimming for additional design flexibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The original IRS2541STRPBF (obsolete) does not specify RoHS status. All recommended alternatives meet current environmental and regulatory requirements for new designs.

Q: Can MP4008GS replace IRS2541STRPBF?

A: MP4008GS maintains 8-SOIC package compatibility and PWM dimming but implements boost and SEPIC topologies rather than buck topology. This part is suitable only if your circuit design can accommodate boost or SEPIC operation. For buck-only applications, select IRS25411STRPBF or HV9930LG-G instead.

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