LM3658SD Equivalent & Substitute Parts

Part Overview

The LM3658SD is a lithium-ion/polymer battery charger IC manufactured by Texas Instruments, designed for single-cell battery charging applications with a maximum charge current of 1A and 4.2V battery pack voltage. The device integrates over-current and over-temperature fault protection with USB interface connectivity. The main part number LM3658SD carries an obsolete product status, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

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)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitution eligibility for the LM3658SD 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 and pinout (10-WFDFN Exposed Pad, 10-WSON 3x3)
Fault protection features (Over Current, Over Temperature)
Mounting type (Surface Mount)
Moisture sensitivity level (MSL 1)

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

Parameter Comparison

Part Number	Manufacturer	Product Status	RoHS Status	Packaging	Inventory (Pcs)	Battery Chemistry	Charge Current Max	Battery Pack Voltage	Supply Voltage Max	Package / Case
LM3658SD	Texas Instruments	Obsolete	RoHS non-compliant	-	4,183	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
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
LM3658SDX/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	23,100	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 maintain full functional and electrical equivalence to the LM3658SD. Selection should be based on the following criteria:

Product Status: The original LM3658SD carries obsolete status. All substitute parts listed are active products with ongoing manufacturer support and availability.

Compliance: The original LM3658SD is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Packaging and Availability: Substitute parts are available in multiple packaging formats (Tape & Reel, Cut Tape & Digi-Reel). Selection should align with procurement and assembly requirements. LM3658SD-A/NOPB offers the highest inventory level at 45,300 pieces.

Functional Interchangeability: All substitute parts are pin-for-pin and functionally equivalent with identical electrical specifications, package dimensions, and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can LM3658SD be directly replaced with LM3658SD/NOPB?

A: Yes. LM3658SD/NOPB is functionally and electrically equivalent with identical specifications. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Both use the same 10-WFDFN package.

Q: What is the difference between LM3658SD-A/NOPB and LM3658SD-B/NOPB?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The suffix designations (-A, -B) indicate different manufacturing batches or date codes. Functionally, they are interchangeable.

Q: Are LM3658SDX variants compatible with LM3658SD?

A: Yes. LM3658SDX/NOPB, LM3658SDX-A/NOPB, and LM3658SDX-B/NOPB maintain identical electrical specifications and package configuration. The "X" designation indicates a variant within the same product family with equivalent performance.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging formats are logistics and assembly considerations only. Electrical specifications and device performance remain identical.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active products with ROHS3 compliance: LM3658SD/NOPB, LM3658SD-A/NOPB, LM3658SD-B/NOPB, LM3658SDX/NOPB, LM3658SDX-A/NOPB, or LM3658SDX-B/NOPB. All are functionally equivalent. Choose based on packaging availability and procurement lead times.

Q: Is the MSL rating identical across all parts?

A: Yes. All parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture handling requirements during storage or assembly.

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