LM3620M5X-4 Equivalent & Substitute Parts

Part Overview

The LM3620M5X-4 is a single-cell lithium-ion battery charger IC manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This component is classified as obsolete, indicating it has been discontinued and is no longer in active production. The part delivers a 4.2V battery pack voltage suitable for single-cell lithium-ion charging applications with a maximum supply voltage of 30V.

Due to its obsolete status, identifying functionally equivalent substitute components is essential for design continuity, production planning, and long-term product support. Substitute parts must maintain compatibility with the original electrical specifications and physical form factor requirements.

Substiute Parts

LM3620M5X-4

Texas InstrumentsIn Stock: 2618LM3620M5X-4 Datasheet

Current PartRFQ

BQ24300DSGR

Texas InstrumentsIn Stock: 34325BQ24300DSGR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The BQ24300DSGR has been identified as a manufacturer-recommended substitute for the LM3620M5X-4. The substitution logic is based on the following critical parameters:

Common Functional Criteria:

• Battery Chemistry: Both parts support Lithium Ion battery applications
• Manufacturer: Both are Texas Instruments components, ensuring design continuity and supply chain consistency
• Mounting Type: Both utilize surface mount technology
• Single-cell operation: Both are designed for single-cell lithium-ion battery management

Substitution Basis: The BQ24300DSGR functions as a battery protection IC for lithium-ion cells, providing complementary protection features (over-current, over-temperature, over/under-voltage) that align with the charging management role of the LM3620M5X-4. While the BQ24300DSGR operates in an 8-WSON package rather than SOT-23-5, it maintains electrical compatibility for single-cell lithium-ion applications with a 4.2V nominal voltage.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM3620M5X-4 is obsolete and no longer manufactured. The BQ24300DSGR is an active product with current production availability, making it the appropriate selection for new designs and ongoing production requirements.

Compliance Status: The BQ24300DSGR meets ROHS3 compliance requirements, whereas the LM3620M5X-4 is RoHS non-compliant. For applications subject to RoHS regulations, the BQ24300DSGR is the mandated choice.

Environmental Certification: Both parts carry REACH Unaffected status and EAR99 ECCN classification, indicating equivalent regulatory standing for export and environmental compliance.

Inventory Availability: The BQ24300DSGR has significantly higher inventory availability (34,240 pcs) compared to the LM3620M5X-4 (2,553 pcs), supporting long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the BQ24300DSGR directly replace the LM3620M5X-4 in existing designs?

A: The BQ24300DSGR is functionally compatible for single-cell lithium-ion battery management applications. However, the package change from SOT-23-5 to 8-WSON (2x2) requires PCB layout modifications. Pin-to-pin compatibility must be verified against the specific application schematic.

Q: What is the primary difference between these two parts?

A: The LM3620M5X-4 is a charger IC, while the BQ24300DSGR is a battery protection IC. Both address lithium-ion battery management but through different functional approaches. The BQ24300DSGR provides over-current, over-temperature, and over/under-voltage protection.

Q: Does the operating temperature range difference affect substitution?

A: The BQ24300DSGR operates across 0°C ~ 125°C (TJ), providing a wider temperature range than the LM3620M5X-4 (0°C ~ 70°C TA). This makes the BQ24300DSGR suitable for applications requiring extended thermal performance.

Q: What packaging considerations apply to this substitution?

A: The LM3620M5X-4 uses SOT-23-5 packaging (5-pin), while the BQ24300DSGR uses 8-WSON (2x2) packaging (8-pin). PCB footprint redesign is required. The BQ24300DSGR includes an exposed pad for thermal management, which may improve heat dissipation in the application.

Q: Are there moisture sensitivity differences?

A: The LM3620M5X-4 has MSL 1 (unlimited shelf life), while the BQ24300DSGR has MSL 2 (1-year shelf life). The BQ24300DSGR requires standard moisture control during storage and handling per IPC-A-610 guidelines.

Q: Is the BQ24300DSGR available in the same packaging as the original part?

A: No. The BQ24300DSGR is only available in 8-WSON (2x2) packaging. If SOT-23-5 form factor is mandatory, alternative substitutes must be evaluated.