LM3658SDX Equivalent & Substitute Parts

Part Overview

The LM3658SDX is a single-cell lithium-ion/polymer battery charger IC manufactured by Texas Instruments, housed in a 10-WFDFN exposed pad package. This device integrates constant-current/constant-voltage charging with programmable charge current up to 1A, over-current and over-temperature fault protection, and USB interface connectivity. The main part number LM3658SDX is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for seamless design substitution.

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)
Mounting Type	Surface Mount
Package / Case	10-WFDFN Exposed Pad
Supplier Device Package	10-WSON (3x3)
Fault Protection	Over Current, Over Temperature
Current - Charging	Constant - Programmable
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM3658SDX is determined by strict equivalence across the following critical parameters:

Battery chemistry and cell count (Lithium Ion/Polymer, 1 cell)
Maximum charge current (1A)
Battery pack voltage (4.2V)
Maximum supply voltage (6V)
Interface type (USB)
Operating temperature range (-40°C ~ 85°C)
Package type (10-WFDFN Exposed Pad / 10-WSON 3x3)
Fault protection features (Over Current, Over Temperature)

All substitute parts listed maintain identical electrical specifications and physical packaging. Variations exist only in product status (active vs. obsolete), RoHS compliance level, and packaging format (Tape & Reel, Cut Tape, or unspecified). These variations do not affect functional interchangeability in circuit design.

Parameter Comparison

Part Number	Manufacturer	Product Status	RoHS Status	Packaging	Inventory (Pcs)	Battery Chemistry	Charge Current Max	Battery Pack Voltage	Supply Voltage Max	Package Type
LM3658SDX	Texas Instruments	Obsolete	RoHS non-compliant	-	1,938	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SDX/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	23,100	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SD-A/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	45,300	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SD-B/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	22,215	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SD/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	19,857	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SDX-A/NOPB	Texas Instruments	Active	ROHS3 Compliant	-	1,496	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad
LM3658SDX-B/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	18,369	Lithium Ion/Polymer	1A	4.2V	6V	10-WFDFN Exposed Pad

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the LM3658SDX and suitable for direct replacement in circuit designs. Selection among alternatives should be based on the following criteria:

Product Status: All substitute parts carry active product status, ensuring long-term availability and manufacturing support. The original LM3658SDX is obsolete and should not be selected for new designs.

Compliance Requirements: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory standards. The original LM3658SDX is RoHS non-compliant and unsuitable for applications requiring RoHS certification.

Packaging Format: Selection depends on procurement and assembly requirements. LM3658SD-A/NOPB is available in Cut Tape and Digi-Reel format for lower-volume applications. LM3658SDX/NOPB, LM3658SD-B/NOPB, LM3658SD/NOPB, and LM3658SDX-B/NOPB are available in Tape & Reel format for high-volume production. LM3658SDX-A/NOPB and LM3658SDX-B/NOPB have unspecified packaging options.

Inventory Availability: LM3658SD-A/NOPB offers the highest inventory level (45,300 units), followed by LM3658SDX/NOPB (23,100 units) and LM3658SD-B/NOPB (22,215 units), providing flexibility for supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can LM3658SDX be directly replaced with LM3658SDX/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). LM3658SDX/NOPB is the direct active equivalent.

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

A: All variants maintain identical electrical specifications: 1A maximum charge current, 4.2V battery pack voltage, 6V maximum supply voltage, USB interface, and 10-WFDFN package. Differences are limited to product status, RoHS compliance, and packaging format. All are functionally interchangeable.

Q: Are the "/NOPB" suffix parts compatible with the original LM3658SDX?

A: Yes. The "/NOPB" suffix indicates lead-free, RoHS-compliant versions. Electrical and mechanical compatibility is maintained. These parts are preferred for new designs due to active product status and regulatory compliance.

Q: Which substitute part should be selected for high-volume production?

A: LM3658SDX/NOPB, LM3658SD-B/NOPB, LM3658SD/NOPB, or LM3658SDX-B/NOPB are recommended for high-volume applications, as they are available in Tape & Reel packaging. LM3658SD-A/NOPB is suitable for lower-volume or mixed-format requirements.

Q: Do all substitute parts support the same operating temperature range?

A: Yes. All substitute parts operate across -40°C to 85°C (TA), matching the original LM3658SDX specification.

Q: Is RoHS compliance mandatory for substitute selection?

A: RoHS compliance depends on application requirements and regional regulations. All substitute parts listed are ROHS3 compliant. The original LM3658SDX is RoHS non-compliant and should not be used in applications requiring RoHS certification.

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