AP3602BKTR-E1 LED Driver IC Equivalent & Substitute Parts

Part Overview

The AP3602BKTR-E1 is a LED Driver IC manufactured by Diodes Incorporated, classified as a Power Management PMIC. This device functions as a 1-output DC-DC regulator with Step-Up (Boost) topology, delivering 100mA output current in a compact SOT-23-6 surface mount package. The part is designed for backlight and camera flash applications with an operating temperature range of -40°C to 85°C.

The AP3602BKTR-E1 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this LED driver topology.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP3602BKTR-E1
Manufacturer	Diodes Incorporated
Product Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Package / Case	SOT-23-6
Voltage Supply (Min)	2.7V
Voltage Supply (Max)	4.5V
Voltage Output	4.8V ~ 5.2V
Current Output / Channel	100mA
Frequency	1.2MHz
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the AP3602BKTR-E1 are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

DC-DC Regulator topology: Step-Up (Boost) configuration
Output voltage range: 4.8V ~ 5.2V or compatible output specification
Output current capability: Minimum 100mA
Supply voltage range: Overlap with 2.7V to 4.5V input specification
Package compatibility: SOT-23-6 or equivalent surface mount package
Operating temperature range: Support for -40°C to 85°C minimum
RoHS3 compliance and MSL rating compatibility

Substitute Categories:

Direct Parametric Equivalent: AP3602AKTR-G1 (Diodes Incorporated) — Identical topology, output specifications, and package with active product status.

Manufacturer Recommended Alternatives: Parts from Texas Instruments (LM2703 series), Analog Devices (LT3518IUF), Microchip Technology (MIC2293), and Monolithic Power Systems (MP1518DJE) offer Step-Up (Boost) topology with enhanced current handling, extended supply voltage ranges, or advanced dimming capabilities suitable for backlight applications.

Extended Alternatives: ROHM Semiconductor (BD6069GUT-E2), Renesas Electronics (ISL97634IRT18Z-T), and Analog Devices (LT3956EUHE) provide multi-topology regulators supporting Step-Up (Boost) configuration with higher current ratings and expanded application flexibility.

Parameter Comparison

Parameter	AP3602BKTR-E1	AP3602AKTR-G1	LM2703MF-ADJ/NOPB	LT3518IUF#TRPBF	MP1518DJE-LF-Z	MIC2293-34YML-TR
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Analog Devices	Monolithic Power Systems	Microchip Technology
Type	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)
Package	SOT-23-6	SOT-23-6	SOT-23-5	16-QFN (4x4)	TSOT-23-6	8-MLF (2x2)
Voltage Supply (Min)	2.7V	2.7V	2.2V	3V	2.5V	2.5V
Voltage Supply (Max)	4.5V	5V	7V	30V	6V	10V
Voltage Output	4.8V ~ 5.2V	4.8V ~ 5.2V	21V	—	25V	—
Current Output / Channel	100mA	100mA	350mA (Switch)	2.3A (Switch)	350mA (Switch)	750mA (Switch)
Frequency	1.2MHz	1.2MHz	—	250kHz ~ 2.5MHz	1.3MHz	2MHz
Dimming	—	—	—	Analog, PWM	Analog, PWM	Analog, PWM
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): AP3602AKTR-G1 is the primary substitute for AP3602BKTR-E1. Both parts are manufactured by Diodes Incorporated with identical topology, output voltage specification (4.8V ~ 5.2V), and 100mA output current. The AP3602AKTR-G1 maintains SOT-23-6 packaging and -40°C to 85°C operating temperature range. The key advantage is active product status with current inventory availability (1324 Pcs), ensuring long-term supply chain support. Both parts are ROHS3 compliant with equivalent MSL ratings.

Higher Current Capacity Alternatives: For applications requiring increased output current beyond 100mA, LM2703MF-ADJ/NOPB (Texas Instruments) and MP1518DJE-LF-Z (Monolithic Power Systems) provide 350mA switch current in Step-Up (Boost) topology. Both maintain ROHS3 compliance and support extended operating temperatures to 125°C. LM2703MF-ADJ/NOPB operates from 2.2V to 7V input with 21V output capability. MP1518DJE-LF-Z operates from 2.5V to 6V input with 25V output and includes Analog/PWM dimming features. Both are active products with substantial inventory.

Multi-Topology Flexibility: LT3518IUF#TRPBF (Analog Devices) supports both Step-Down (Buck) and Step-Up (Boost) topologies with 2.3A switch current, 250kHz to 2.5MHz frequency range, and Analog/PWM dimming. Operating range extends from 3V to 30V input. This part accommodates broader application requirements while maintaining ROHS3 compliance and active product status.

Selection Criteria by Application:

Backlight applications with 100mA requirement: AP3602AKTR-G1
Backlight applications with higher current: LM2703MF-ADJ/NOPB or MP1518DJE-LF-Z
Camera flash applications: LM3556TMX/NOPB (1.5A flash current, I2C dimming)
Multi-topology flexibility: LT3518IUF#TRPBF or LT3956EUHE#PBF

All recommended substitutes maintain ROHS3 compliance and are currently in active production status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can AP3602AKTR-G1 be used as a direct drop-in replacement for AP3602BKTR-E1?

A: Yes. Both parts share identical DC-DC regulator topology (Step-Up Boost), output voltage specification (4.8V ~ 5.2V), output current (100mA), package (SOT-23-6), and operating temperature range (-40°C to 85°C). The primary difference is product status: AP3602AKTR-G1 is active with current inventory, while AP3602BKTR-E1 is obsolete. Pin configuration and electrical characteristics are equivalent.

Q: What is the key difference between 100mA and 350mA output current specifications?

A: Output current rating indicates the maximum LED driver switch current the IC can deliver. The AP3602BKTR-E1 at 100mA is suitable for lower-power backlight and indicator applications. Parts like LM2703MF-ADJ/NOPB and MP1518DJE-LF-Z rated at 350mA support higher-brightness LED arrays or multiple LED strings. Selection depends on total LED current requirements in the target application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, matching the compliance status of the AP3602BKTR-E1. This ensures regulatory compatibility for applications subject to RoHS directives.

Q: What does MSL (Moisture Sensitivity Level) rating mean for component selection?

A: MSL rating indicates moisture sensitivity during storage and handling. AP3602BKTR-E1 carries MSL 3 (168 hours), requiring controlled storage conditions. Many substitutes (LM2703MF-ADJ/NOPB, LT3518IUF#TRPBF, MP1518DJE-LF-Z, MIC2293-34YML-TR) carry MSL 1 (Unlimited), indicating lower moisture sensitivity and more flexible storage requirements. MSL 1 parts offer handling advantages in manufacturing environments.

Q: Can I use LT3518IUF#TRPBF in place of AP3602BKTR-E1 despite different package types?

A: LT3518IUF#TRPBF uses 16-QFN (4x4) packaging versus SOT-23-6 for the AP3602BKTR-E1. While electrically compatible for Step-Up (Boost) topology with superior current handling (2.3A), the different package requires PCB layout redesign. This substitution is suitable for new designs or redesigns but not for direct board-level replacement without layout modification.

Q: Which substitute part supports the widest input voltage range?

A: LT3956EUHE#PBF supports 4.5V to 80V input range, the broadest among listed substitutes. However, this part operates in multiple topologies (Flyback, SEPIC, Step-Down, Step-Up) and is designed for higher-voltage applications. For the AP3602BKTR-E1's 2.7V to 4.5V input specification, AP3602AKTR-G1 (2.7V to 5V) or LM2703MF-ADJ/NOPB (2.2V to 7V) are more appropriate selections.

Q: What is the significance of PWM and Analog dimming capabilities?

A: Dimming control methods determine how LED brightness is adjusted. AP3602BKTR-E1 does not specify dimming capability. Substitutes like LT3518IUF#TRPBF, MP1518DJE-LF-Z, and MIC2293-34YML-TR offer Analog and PWM dimming, enabling software-controlled brightness adjustment. Selection depends on whether the application requires dynamic brightness control.

Q: Is LM3556TMX/NOPB suitable for backlight applications?

A: LM3556TMX/NOPB is optimized for camera flash applications with 1.5A flash current and I2C dimming interface. While it supports Step-Up (Boost) topology and backlight applications are listed, its high current rating and I2C control are designed for flash-specific requirements. For standard backlight applications, AP3602AKTR-G1 or LM2703MF-ADJ/NOPB are more appropriate selections.

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