APM8601FB-7 Equivalent & Substitute Parts

Part Overview

The APM8601FB-7 is a lithium-ion/polymer battery charger IC manufactured by Diodes Incorporated, designed for single-cell battery charging applications. This device integrates constant-current/constant-voltage charging control with programmable current and timer features, operating from USB power sources up to 7V.

The APM8601FB-7 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure availability for new production runs or system updates.

Key Parameters

Parameter	Value
Manufacturer Part Number	APM8601FB-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Battery Chemistry	Lithium Ion/Polymer
Number of Cells	1
Charge Current - Max	1A
Battery Pack Voltage	4.2V
Voltage - Supply (Max)	7V
Interface	USB
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	14-UFDFN Exposed Pad
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the APM8601FB-7 is determined by the following core parameters:

Battery Chemistry & Cell Count: Must support Lithium Ion/Polymer single-cell charging
Charge Current Rating: Maximum charge current must be ≥1A
Battery Pack Voltage: Must support 4.2V nominal output
Supply Voltage Range: Must accommodate USB input power (minimum 7V tolerance)
Charging Control Method: Must provide constant-current/constant-voltage charging with programmable features
Fault Protection: Must include over-temperature protection
Interface: Must support USB connectivity
Compliance: Must maintain ROHS3 compliance and REACH unaffected status
Mounting Type: Surface mount requirement

The L6924UTR meets all substitution criteria within these parameters.

Parameter Comparison

Parameter	APM8601FB-7	L6924UTR	Compatibility
Manufacturer	Diodes Incorporated	STMicroelectronics	Different manufacturer
Battery Chemistry	Lithium Ion/Polymer	Lithium Ion/Polymer	Match
Number of Cells	1	1	Match
Current - Charging	Constant - Programmable	Constant - Programmable	Match
Programmable Features	Current, Timer	Current, Timer	Match
Fault Protection	Over Temperature	Over Temperature	Match
Charge Current - Max	1A	1A	Match
Battery Pack Voltage	4.2V	4.2V	Match
Voltage - Supply (Max)	7V	12V	L6924UTR supports higher supply voltage
Interface	USB	USB	Match
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	L6924UTR supports extended temperature range
Mounting Type	Surface Mount	Surface Mount	Match
Package / Case	14-UFDFN Exposed Pad	16-VFQFN Exposed Pad	Different package; PCB layout redesign required
Product Status	Obsolete	Active	L6924UTR actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	L6924UTR requires controlled storage conditions

Engineering Selection Recommendations

The L6924UTR is a qualified substitute for the APM8601FB-7 based on the following factors:

Functional Equivalence: Both devices provide single-cell lithium-ion/polymer charging with identical maximum charge current (1A), battery pack voltage (4.2V), and programmable charging control with timer functionality. Both include over-temperature fault protection and USB interface support.

Compliance & Certification: The L6924UTR maintains ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original part.

Product Availability: The L6924UTR is actively manufactured by STMicroelectronics, ensuring long-term supply availability compared to the obsolete APM8601FB-7.

Design Considerations: The L6924UTR operates at a higher maximum supply voltage (12V vs. 7V) and extended temperature range (-40°C to 125°C vs. -40°C to 85°C), providing enhanced performance margins. However, the package differs (16-VFQFN vs. 14-UFDFN), requiring PCB layout and schematic redesign. The L6924UTR also has a higher moisture sensitivity level (MSL 3 vs. MSL 1), necessitating controlled storage and handling procedures during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the L6924UTR directly replace the APM8601FB-7 without PCB modifications?

A: No. The L6924UTR uses a 16-VFQFN package while the APM8601FB-7 uses a 14-UFDFN package. PCB layout redesign is required, including footprint changes and potential signal routing adjustments.

Q: Are the electrical specifications compatible for single-cell lithium charging?

A: Yes. Both devices support identical single-cell lithium-ion/polymer charging with 1A maximum charge current and 4.2V battery pack voltage. Programmable current and timer features are present in both parts.

Q: What is the impact of the different maximum supply voltages?

A: The L6924UTR supports up to 12V supply input compared to 7V for the APM8601FB-7. This provides additional design margin for USB power delivery systems and is not a limitation for applications designed for the original 7V specification.

Q: Does the higher operating temperature range of the L6924UTR affect compatibility?

A: No. The L6924UTR's extended operating range (-40°C to 125°C) is a superset of the APM8601FB-7 specification (-40°C to 85°C), providing enhanced thermal performance without compatibility concerns.

Q: What precautions are necessary regarding moisture sensitivity?

A: The L6924UTR has MSL 3 rating (168-hour moisture absorption limit) compared to MSL 1 (unlimited) for the APM8601FB-7. Manufacturing processes must include controlled humidity storage and baking procedures prior to reflow soldering to prevent moisture-induced defects.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the APM8601FB-7 and L6924UTR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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