RT8415GSP LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8415GSP is an AC DC offline switcher LED driver IC manufactured by Richtek USA Inc., designed for lighting and signage applications. This single-output device operates across a 4.5V to 36V supply range with integrated step-down (buck) and step-up (boost) topology capabilities. The part is classified as obsolete, making equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility within the AC DC offline switcher category while accommodating the electrical and mechanical constraints of the original design.

Key Parameters

Parameter	RT8415GSP Value
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	36V
Internal Switch(s)	No
Applications	Lighting, Signage
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Grade	Automotive

Substitute Part Grouping Explanation

Substitution logic for the RT8415GSP is based on the following critical parameters:

Primary Compatibility Criteria:

AC DC offline switcher topology with single output configuration
Step-down (buck) and/or step-up (boost) capability
Surface mount packaging with 8-pin or compatible pin count
Operating temperature range of -40°C minimum
ROHS3 compliance and automotive-grade qualification where applicable

Substitution Groups:

Group 1: Direct Topology Match (Buck-Boost, 8-Pin Surface Mount) Parts AL9910AS-13 and TPS92074D maintain the exact buck-boost topology in 8-SOIC packaging. These represent the closest functional equivalents, though with different supply voltage ranges.

Group 2: Buck-Only Topology (Reduced Functionality) Parts LM3444MMX/NOPB and LM3497M/NOPB provide step-down (buck) topology only, suitable for applications not requiring boost capability. These parts operate at lower supply voltages (8V–13V and 8V–12V respectively).

Group 3: Flyback Topology (Alternative Architecture) Parts LNK413LG and LT3799IMSE#PBF employ flyback topology with internal or external switching, representing architectural alternatives for offline LED driver applications.

Parameter Comparison

Parameter	RT8415GSP	AL9910AS-13	HV98101T-E/CH	TPS92074D	LM3444MMX/NOPB	LNK413LG
Manufacturer	Richtek USA Inc.	Diodes Incorporated	Microchip Technology	Texas Instruments	National Semiconductor	Power Integrations
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	Buck, Boost	Buck, Boost	Buck, Boost	Buck, Boost	Buck	Flyback
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	4.5V	20V	8V	11V	8V	36V
Voltage - Supply (Max)	36V	500V	16V	18V	13V	725V
Internal Switch(s)	No	No	No	No	No	Yes
Operating Temperature (Min)	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C
Operating Temperature (Max)	85°C (TA)	85°C (TA)	125°C (TJ)	125°C (TJ)	125°C (TJ)	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole
Package / Case	8-SOIC Exposed Pad	8-SOIC	SOT-23-6	8-SOIC	10-VSSOP	7-SSIP eSIP-7F
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	RoHS Compliant

Engineering Selection Recommendations

For Direct Replacement (Buck-Boost Topology Required):

AL9910AS-13 and TPS92074D are the primary candidates when buck-boost functionality is mandatory. AL9910AS-13 operates at higher supply voltages (20V–500V) and includes PWM and analog dimming options, making it suitable for high-voltage offline applications. TPS92074D operates at 11V–18V and maintains ROHS3 compliance with active product status. Both are surface-mount 8-SOIC packages compatible with RT8415GSP PCB layouts.

For Buck-Only Applications:

LM3444MMX/NOPB and LM3497M/NOPB are appropriate when step-down topology alone satisfies application requirements. LM3444MMX/NOPB provides analog dimming in a 10-VSSOP package, while LM3497M/NOPB offers triac dimming in a 14-SOIC package. Both maintain -40°C to 125°C operating ranges and ROHS3 compliance.

For High-Voltage or Flyback Architectures:

LNK413LG (Power Integrations LinkSwitch-PH series) and LT3799IMSE#PBF employ flyback topology suitable for wide input voltage ranges (36V–725V for LNK413LG). These parts are appropriate when the application topology can accommodate flyback architecture and when higher operating temperatures (150°C for LNK413LG) are beneficial.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance. The RT8415GSP carries automotive-grade qualification; substitutes with equivalent automotive ratings should be prioritized for automotive applications. HV98101T-E/CH and TPS92074D both support automotive-grade requirements through their respective manufacturers' product lines.

Frequently Asked Questions (FAQ)

Q: Can AL9910AS-13 directly replace RT8415GSP in a 4.5V–36V supply application?

A: AL9910AS-13 operates at 20V minimum supply voltage, exceeding the RT8415GSP's 4.5V minimum. Direct replacement is not possible for applications requiring operation below 20V input. For applications within the 20V–36V overlap range, AL9910AS-13 is functionally compatible with buck-boost topology and 8-SOIC packaging.

Q: What is the key difference between TPS92074D and RT8415GSP?

A: Both devices employ buck-boost topology in 8-SOIC packages. TPS92074D operates at 11V–18V supply voltage, which overlaps with the RT8415GSP's 4.5V–36V range only between 11V–18V. TPS92074D is suitable for applications within this narrower voltage window. Both maintain ROHS3 compliance and -40°C minimum operating temperature.

Q: Why do LM3444MMX/NOPB and LM3497M/NOPB show reduced functionality?

A: These parts provide step-down (buck) topology only, without step-up (boost) capability. They are suitable for applications where the output voltage is always lower than the input voltage. If the design requires boost functionality, these parts are not appropriate substitutes.

Q: Is LNK413LG a suitable replacement for general lighting applications?

A: LNK413LG employs flyback topology with internal switching and operates at 36V–725V supply range. It is suitable for offline LED lighting applications but requires different circuit topology than the RT8415GSP. PCB redesign and external component changes are necessary. LNK413LG is appropriate for new designs or applications where flyback architecture is acceptable.

Q: What packaging considerations apply to substitute selection?

A: RT8415GSP uses 8-SOIC with exposed pad (surface mount). AL9910AS-13 and TPS92074D maintain 8-SOIC compatibility for direct PCB layout reuse. HV98101T-E/CH uses SOT-23-6 (smaller footprint), LM3444MMX/NOPB uses 10-VSSOP, LM3497M/NOPB uses 14-SOIC, and LNK413LG uses 7-SSIP through-hole. Package differences require PCB layout modifications.

Q: Are all substitute parts currently in active production status?

A: Yes. All recommended substitutes maintain active product status. The RT8415GSP is classified as obsolete, making active substitutes essential for production continuity and long-term design support.

Q: What dimming options are available across substitute parts?

A: RT8415GSP does not specify dimming capability. AL9910AS-13 supports analog and PWM dimming. HV98101T-E/CH and TPS92074D do not specify dimming. LM3444MMX/NOPB supports analog dimming. LM3497M/NOPB supports triac dimming. LNK413LG supports PWM dimming. Dimming requirements should be verified against application specifications before selection.

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