AP3031KTR-AG1 Equivalent & Substitute Parts

Part Overview

The AP3031KTR-AG1 is a LED Driver IC manufactured by Diodes Incorporated, functioning as a 1-output DC-DC regulator with step-up (boost) topology and PWM dimming capability. This component delivers 1.4A switch current and operates across a 2.7V to 16V supply range, making it suitable for backlight applications. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components to maintain design continuity and ensure long-term supply availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP3031KTR-AG1
Manufacturer	Diodes Incorporated
Product Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply Range	2.7V to 16V
Current Output / Channel	1.4A (Switch)
Switching Frequency	1MHz
Dimming Method	PWM
Package / Case	SOT-23-6 Thin (TSOT-23-6)
Operating Temperature	-40°C to 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AP3031KTR-AG1 is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Number of Outputs: 1
Dimming Method: PWM
Supply Voltage Range: Minimum 2.7V, Maximum 16V (or compatible overlap)
Current Capability: 1.4A or greater switch current
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C or wider
RoHS3 Compliance

Parametric Equivalent (Direct Replacement): The AP3031KTR-G1 is a parametric equivalent from the same manufacturer (Diodes Incorporated), sharing identical electrical specifications, topology, dimming method, and package type. This part is currently active and represents the direct successor to the obsolete AP3031KTR-AG1.

Manufacturer-Recommended Alternatives: The remaining substitute parts are manufacturer-recommended alternatives that satisfy the core functional requirements (boost topology, PWM dimming, LED driver application) but may differ in secondary parameters such as package type, frequency, supply voltage range, or current rating. These alternatives are selected based on functional compatibility within the LED driver and backlight application domain.

Parameter Comparison

Parameter	AP3031KTR-AG1	AP3031KTR-G1	FAN5333ASX	IS31LT3353-SDLS4-TR	LM3555TLE/NOPB	LM3556TME/NOPB	LT3498EDDB#TRMPBF	LT3590EDC#TRMPBF	MCP1662T-E/MNY	MIC2297-38YML-TR
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	Lumissil	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Microchip	Microchip
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Down (Buck)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Down (Buck)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1	1	1	1	1
Voltage Supply (Min)	2.7V	2.7V	1.8V	6V	2.5V	2.5V	2.5V	4.5V	2.4V	2.5V
Voltage Supply (Max)	16V	16V	5.5V	40V	5.5V	5.5V	12V	55V	5.5V	10V
Current Output / Channel	1.4A (Switch)	1.4A (Switch)	1.5A (Switch)	1A	500mA (Flash)	1.5A (Flash)	20mA	80mA (Switch)	200mA	1.2A (Switch)
Switching Frequency	1MHz	1MHz	1.5MHz	1MHz	2MHz	4MHz	2.3MHz	850kHz	500kHz	600kHz
Dimming Method	PWM	PWM	Analog, PWM	Analog, PWM	I2C	I2C	Analog, PWM	PWM	PWM	PWM
Package / Case	SOT-23-6 Thin	SOT-23-6 Thin	SC-74A (SOT-23-5)	SOT-89-5	12-WFBGA	16-WFBGA	12-WFDFN	6-WFDFN	8-WFDFN	10-VFDFN / 10-MLF
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-30°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): AP3031KTR-G1 is the recommended first choice for direct substitution. This part maintains identical electrical specifications, topology, dimming method, package type, and operating temperature range as the obsolete AP3031KTR-AG1. Both components are ROHS3 compliant with MSL 1 rating. The AP3031KTR-G1 is currently active with substantial inventory availability (150,300 pcs), ensuring long-term supply continuity.

Alternative Selections Based on Application Requirements:

For designs requiring boost topology with PWM dimming and 1.4A or greater switch current in active production status, the following alternatives are viable:

FAN5333ASX (onsemi): Offers 1.5A switch current with dual dimming capability (Analog and PWM). Supply voltage range is narrower (1.8V to 5.5V), limiting compatibility with higher input voltage applications. Package is SOT-23-5 (5-pin vs. 6-pin).
MIC2297-38YML-TR (Microchip): Provides 1.2A switch current with PWM dimming. Supply range (2.5V to 10V) overlaps the original specification. Operating temperature extends to 125°C. Package is 10-MLF (3x3), requiring PCB layout adjustment.
LT3498EDDB#TRMPBF (Analog Devices): Supports boost topology with PWM dimming but delivers only 20mA output current, suitable only for low-power backlight applications. Supply range (2.5V to 12V) is compatible.
MCP1662T-E/MNY (Microchip): Boost topology with PWM dimming, 200mA output current. Supply range (2.4V to 5.5V) is narrower. Operating temperature to 125°C. Package is 8-TDFN (2x3).

Parts with Topology Deviation: IS31LT3353-SDLS4-TR and LT3590EDC#TRMPBF employ step-down (buck) topology, fundamentally different from the boost topology of the AP3031KTR-AG1. These are not suitable for direct substitution in boost-dependent circuit designs.

Parts with Dimming Method Deviation: LM3555TLE/NOPB and LM3556TME/NOPB use I2C dimming control instead of PWM, requiring firmware or control circuit modifications. These are applicable only if system architecture supports I2C communication.

All recommended alternatives maintain ROHS3 compliance and MSL 1 or MSL 3 ratings, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP3031KTR-G1 be used as a direct drop-in replacement for AP3031KTR-AG1?

A: Yes. AP3031KTR-G1 is a parametric equivalent with identical electrical specifications, topology, package type, and operating temperature range. No circuit modifications are required. The primary difference is product status: AP3031KTR-G1 is active with high inventory availability, while AP3031KTR-AG1 is obsolete.

Q: What is the key difference between boost and buck topology in LED driver selection?

A: Boost (step-up) topology increases input voltage to achieve higher output voltage, suitable for applications requiring voltage elevation from low battery levels. Buck (step-down) topology reduces input voltage, suitable for high-voltage input applications. The AP3031KTR-AG1 uses boost topology; substitutes with buck topology (IS31LT3353-SDLS4-TR, LT3590EDC#TRMPBF) are not interchangeable without circuit redesign.

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

A: Package type is determined by manufacturer design and thermal requirements. While electrical function may be equivalent, different packages (SOT-23-6 vs. SOT-89-5 vs. DFN) require different PCB footprints and layout considerations. Package selection affects board space, thermal dissipation, and manufacturing compatibility.

Q: Can I use FAN5333ASX if my supply voltage exceeds 5.5V?

A: No. FAN5333ASX has a maximum supply voltage of 5.5V, while AP3031KTR-AG1 supports up to 16V. Using FAN5333ASX with supply voltages above 5.5V will damage the component. Verify your circuit's input voltage range before selecting a substitute.

Q: What does PWM dimming mean, and how does it differ from I2C dimming?

A: PWM (Pulse Width Modulation) dimming controls LED brightness by varying the duty cycle of a PWM signal applied to the dimming pin. I2C dimming uses serial communication protocol to control brightness settings. These are fundamentally different control methods; substituting PWM-based designs with I2C-based parts requires control circuit modification.

Q: Is MSL 3 rating acceptable for my application?

A: MSL (Moisture Sensitivity Level) 3 indicates the component requires controlled storage and handling conditions (168-hour floor life after moisture exposure). If your manufacturing process includes extended storage or high-humidity environments, MSL 1 components (unlimited floor life) are preferred. IS31LT3353-SDLS4-TR has MSL 3; all other alternatives have MSL 1.

Q: Which substitute offers the closest current rating to the original 1.4A?

A: FAN5333ASX (1.5A) and MIC2297-38YML-TR (1.2A) are closest to the original 1.4A specification. FAN5333ASX slightly exceeds the original rating, while MIC2297-38YML-TR is slightly below. Both are suitable for applications designed around 1.4A switch current.

Q: Can I use LM3555TLE/NOPB or LM3556TME/NOPB in my backlight application?

A: These parts are designed for camera flash applications with I2C dimming control. While they share boost topology and LED driver functionality, their I2C control interface and flash-optimized current ratings (500mA and 1.5A respectively) make them unsuitable for standard PWM-controlled backlight applications without significant firmware and control circuit modifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message