LM3658SD-B Equivalent & Substitute Parts

Part Overview

The LM3658SD-B is a single-cell lithium-ion/polymer battery charger IC manufactured by Texas Instruments, housed in a 10-WFDFN exposed pad package. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity. The LM3658SD-B provides constant-programmable charging current up to 1A with integrated over-current and over-temperature fault protection, operating across a -40°C to 85°C temperature range with USB interface connectivity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
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)	6V
Interface	USB
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	10-WFDFN Exposed Pad
Supplier Device Package	10-WSON (3x3)
Mounting Type	Surface Mount
Fault Protection	Over Current, Over Temperature
Current - Charging	Constant - Programmable
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN	EAR99

Substitute Part Grouping Explanation

Substitution eligibility for the LM3658SD-B is determined by strict equivalence across the following critical parameters:

Battery Chemistry: Lithium Ion/Polymer
Number of Cells: 1
Charge Current - Max: 1A
Battery Pack Voltage: 4.2V
Voltage - Supply (Max): 6V
Interface: USB
Operating Temperature Range: -40°C ~ 85°C (TA)
Package / Case: 10-WFDFN Exposed Pad
Supplier Device Package: 10-WSON (3x3)
Mounting Type: Surface Mount
Fault Protection: Over Current, Over Temperature
Current - Charging: Constant - Programmable
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Variations in product status, RoHS compliance, and packaging format (Tape & Reel vs. Cut Tape) do not affect functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Charge Current (Max)	Battery Pack Voltage	Supply Voltage (Max)	Operating Temperature	Package Type	RoHS Status	Inventory (Pcs)
LM3658SD-B	Texas Instruments	Obsolete	-	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	RoHS non-compliant	2966
LM3658SD-B/NOPB	Texas Instruments	Active	Tape & Reel (TR)	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	22215
LM3658SD-A/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	45300
LM3658SD/NOPB	Texas Instruments	Active	Tape & Reel (TR)	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	19857
LM3658SDX-A/NOPB	Texas Instruments	Active	-	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	1496
LM3658SDX-B/NOPB	Texas Instruments	Active	Tape & Reel (TR)	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	18369
LM3658SDX/NOPB	Texas Instruments	Active	Tape & Reel (TR)	1A	4.2V	6V	-40°C ~ 85°C	10-WFDFN Exposed Pad	ROHS3 Compliant	23100

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the LM3658SD-B. Selection criteria should prioritize the following factors:

Product Status: All substitute parts carry Active status, ensuring long-term availability and manufacturing support. The original LM3658SD-B is Obsolete and should not be selected for new designs.

Compliance: All substitute parts are ROHS3 Compliant, meeting current regulatory requirements. The original LM3658SD-B is RoHS non-compliant and unsuitable for applications requiring regulatory compliance.

Packaging Format: Substitute parts are available in multiple packaging configurations:

Tape & Reel (TR): LM3658SD-B/NOPB, LM3658SD/NOPB, LM3658SDX-B/NOPB, LM3658SDX/NOPB
Cut Tape (CT) & Digi-Reel®: LM3658SD-A/NOPB
Unspecified packaging: LM3658SDX-A/NOPB

Inventory Availability: LM3658SD-A/NOPB offers the highest inventory level (45,300 pcs), followed by LM3658SDX/NOPB (23,100 pcs) and LM3658SD-B/NOPB (22,215 pcs).

For new production designs, LM3658SD-A/NOPB or LM3658SD-B/NOPB are recommended based on packaging requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can LM3658SD-B be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain identical electrical specifications (1A maximum charge current, 4.2V battery pack voltage, 6V maximum supply voltage, USB interface, -40°C to 85°C operating range) and mechanical specifications (10-WFDFN exposed pad package, 10-WSON 3x3 footprint, surface mount). Direct pin-for-pin and functional replacement is supported.

Q: What is the difference between LM3658SD and LM3658SDX variants?

A: Both variants maintain identical electrical and mechanical parameters. The SDX designation indicates a different manufacturing process or die revision. Functional equivalence is maintained across all electrical and thermal specifications.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR), Cut Tape (CT), and unspecified packaging formats contain identical die and electrical characteristics. Packaging format selection is determined by assembly process requirements and inventory management, not electrical performance.

Q: Why is the original LM3658SD-B marked as Obsolete?

A: The original LM3658SD-B is no longer in active production. Active equivalent variants with improved compliance status (ROHS3 Compliant) and superior availability are available as direct replacements.

Q: Are all substitutes ROHS3 Compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant. The original LM3658SD-B is RoHS non-compliant and should not be used in applications requiring regulatory compliance.

Q: What is the difference between /NOPB and non-/NOPB designations?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging. This designation is standard for current production parts and reflects compliance with lead-free manufacturing requirements.

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