AP8801SG-13 LED Driver IC Equivalent & Substitute Parts

Part Overview

The AP8801SG-13 is a LED Driver IC manufactured by Diodes Incorporated, designed for step-down (buck) topology DC-DC regulation with integrated PWM dimming capability. This device delivers 500mA output current and operates across an 8V to 48V supply range, making it suitable for backlight and lighting applications. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain alternatives, and support ongoing production requirements for existing applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP8801SG-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage Supply Range	8V to 48V
Output Current	500mA (Switch)
Switching Frequency	625kHz
Dimming Capability	Analog, PWM
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C to 105°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the AP8801SG-13 is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Down (Buck) configuration with internal switching capability
Output Current Rating: Minimum 500mA to match or exceed the original specification
Supply Voltage Range: Compatibility with 8V to 48V input range
Dimming Control: Support for Analog and/or PWM dimming methods
Package Compatibility: Surface mount packages suitable for 8-pin configurations
Switching Frequency: Operation in the 500kHz to 1MHz range for efficient power conversion

Secondary Compatibility Factors:

Operating temperature range: -40°C minimum to support industrial applications
RoHS3 compliance for regulatory alignment
Internal switch integration for simplified external component requirements
Single output configuration matching the original design

Substitute parts are grouped into two categories based on topology and current rating alignment:

Category A - Direct Buck Topology Substitutes (Preferred): Parts maintaining step-down topology with 500mA or higher output current ratings, supporting both analog and PWM dimming, and operating within the 8V to 48V supply range.

Category B - Alternative Topology Substitutes: Parts with different topologies (boost, SEPIC) or reduced current ratings that may require circuit redesign but offer enhanced features or extended supply voltage ranges.

Parameter Comparison

Part Number	Manufacturer	Topology	Output Current	Supply Voltage (Min-Max)	Dimming	Package	Frequency	Temp Range	Status
AP8801SG-13	Diodes Inc.	Step-Down (Buck)	500mA	8V - 48V	Analog, PWM	8-SOIC	625kHz	-40°C to 105°C	Not For New Designs
IS31LT3350-V1STLS2-TR	Lumissil Microsystems	Step-Down (Buck)	650mA	6V - 40V	Analog, PWM	SOT-23-5	1MHz	-40°C to 85°C	Active
IS31LT3353-V1STLS2-TR	ISSI	Step-Down (Buck)	1A	6V - 40V	Analog, PWM	SOT-23-5	1MHz	-40°C to 125°C	Active
LM3402MM/NOPB	Texas Instruments	Step-Down (Buck)	500mA	6V - 42V	PWM	8-VSSOP	1MHz	-40°C to 125°C	Active
LM3406HVMH/NOPB	Texas Instruments	Step-Down (Buck)	1.5A	6V - 75V	PWM	14-HTSSOP	10kHz - 1MHz	-40°C to 125°C	Active
LM3414MRX/NOPB	Texas Instruments	Step-Down (Buck)	1A	4.5V - 42V	Analog, PWM	8-PowerSOIC	500kHz	-40°C to 125°C	Active
LED2001PHR	STMicroelectronics	Step-Down (Buck)	4A	3V - 18V	PWM	8-HSOP	850kHz	-40°C to 150°C	Active
LED6000PHR	STMicroelectronics	Step-Down (Buck)	3A	4.5V - 61V	PWM	16-HTSSOP	250kHz - 1.5MHz	-40°C to 150°C	Active
A8513KLYTR-1-T	Allegro MicroSystems	SEPIC, Step-Up (Boost)	150mA	4.5V - 40V	PWM	10-MSOP-EP	1MHz	-40°C to 125°C	Active
BD6071HFN-TR	Rohm Semiconductor	Step-Up (Boost)	35mA	2.7V - 5.5V	PWM	8-HSON	1MHz	-30°C to 85°C	Active
ISL97634ART26Z-T	Renesas Electronics	Not Specified	Not Specified	Not Specified	Not Specified	8-TDFN	Not Specified	Not Specified	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Recommended for Existing Designs):

LM3402MM/NOPB and LM3414MRX/NOPB are the primary recommended substitutes. Both maintain step-down topology, support the required 500mA output current specification, and operate within compatible supply voltage ranges. LM3402MM/NOPB matches the exact 500mA current rating and operates from 6V to 42V, covering the majority of the AP8801SG-13 supply range. LM3414MRX/NOPB provides 1A capability with analog and PWM dimming support, offering design margin for future upgrades. Both devices are Active status products from Texas Instruments with full RoHS3 compliance and extended operating temperature ranges to 125°C.

Tier 2 - Enhanced Current Capability Substitutes:

IS31LT3353-V1STLS2-TR and IS31LT3350-V1STLS2-TR offer increased output current (1A and 650mA respectively) while maintaining step-down topology and dual dimming control. These parts are suitable for applications requiring higher current delivery or design margin. Both are Active status with RoHS3 compliance. The IS31LT3353 operates to 125°C, providing superior thermal performance compared to the original part.

Tier 3 - High Current / Extended Voltage Range Substitutes:

LED2001PHR and LED6000PHR from STMicroelectronics provide significantly higher current ratings (4A and 3A) and extended operating temperature ranges to 150°C. LED6000PHR supports supply voltages up to 61V, exceeding the original 48V maximum. These parts are suitable for applications requiring higher power delivery or extended thermal operation. Both maintain step-down topology and PWM dimming capability.

Alternative Topology Considerations:

A8513KLYTR-1-T and BD6071HFN-TR employ boost or SEPIC topologies and are not recommended as direct substitutes due to fundamental circuit topology differences and significantly reduced current ratings. These parts require complete circuit redesign and are suitable only for applications with different voltage conversion requirements.

All recommended Tier 1 and Tier 2 substitutes carry Active product status, ensuring long-term availability and manufacturing support. All parts maintain RoHS3 compliance for regulatory alignment with the original AP8801SG-13 specification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace AP8801SG-13 with LM3402MM/NOPB without circuit modifications?

A: LM3402MM/NOPB maintains identical step-down topology, 500mA output current rating, and compatible supply voltage range (6V to 42V covers the 8V to 48V requirement). However, package differences (8-VSSOP vs. 8-SOIC) require PCB layout adjustment. Verify dimming control implementation, as LM3402MM supports PWM dimming only, whereas AP8801SG-13 supports both analog and PWM. Review Texas Instruments datasheets for pin-to-pin compatibility before implementation.

Q: What is the key difference between Tier 1 and Tier 2 substitutes?

A: Tier 1 substitutes (LM3402MM/NOPB, LM3414MRX/NOPB) match or closely approximate the original 500mA current specification and are optimized for direct replacement. Tier 2 substitutes (IS31LT3350, IS31LT3353) provide higher current ratings (650mA to 1A) and are suitable when design margin or future current upgrades are required. Both tiers maintain step-down topology and active product status.

Q: Why are boost topology parts (A8513KLYTR-1-T, BD6071HFN-TR) listed as alternatives?

A: Boost topology parts are included for reference as they appear in the original AP8801SG-13 substitute list. However, they are not recommended for direct replacement due to fundamental topology differences (step-up vs. step-down conversion) and significantly reduced current ratings (150mA and 35mA). These parts require complete circuit redesign and are suitable only for applications with different voltage conversion requirements.

Q: How do package differences affect substitution?

A: Package differences require PCB layout redesign. AP8801SG-13 uses 8-SOIC (0.154", 3.90mm width). Recommended substitutes use 8-VSSOP (LM3402MM), 8-PowerSOIC (LM3414MRX), SOT-23-5 (IS31LT3350/3353), or 8-HSOP (LED2001PHR). Pin counts and spacing differ; verify pinout compatibility and thermal pad requirements in device datasheets before PCB redesign.

Q: What is the impact of supply voltage range differences?

A: AP8801SG-13 operates from 8V to 48V. LM3402MM operates from 6V to 42V, covering most applications but with reduced upper voltage margin. LM3406HVMH extends to 75V, and LED6000PHR extends to 61V, providing enhanced voltage range for applications approaching the original 48V maximum. Verify your application's actual supply voltage requirements before selection.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All Tier 1 and Tier 2 recommended substitutes maintain RoHS3 compliance, matching the original AP8801SG-13 specification. This ensures regulatory alignment for applications subject to RoHS requirements.

Q: What is the significance of "Active" product status?

A: Active status indicates the manufacturer continues production and provides long-term supply availability. AP8801SG-13 is "Not For New Designs," meaning Diodes Incorporated has discontinued active support. All recommended substitutes carry Active status, ensuring continued availability for production and support throughout the product lifecycle.

Q: How do dimming control differences affect circuit design?

A: AP8801SG-13 supports both analog and PWM dimming. LM3402MM supports PWM only; LM3414MRX supports both analog and PWM. If your application requires analog dimming control, select LM3414MRX or IS31LT3350/3353. If PWM dimming is sufficient, LM3402MM is acceptable. Review control circuit implementation in your existing design to determine dimming method requirements.

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