LP3905SD-A3 Equivalent & Substitute Parts

Part Overview

The LP3905SD-A3 is a dual-channel low-dropout (LDO) regulator with integrated buck converter functionality, designed for handheld and mobile device power management applications. This integrated circuit operates within a 3V to 5.5V supply voltage range and delivers up to 600mA per channel in a compact 14-WSON (4x4) surface-mount package.

The LP3905SD-A3 carries an obsolete product status, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Direct substitutes maintain identical electrical specifications, mechanical packaging, and application compatibility while offering improved availability and compliance status.

Substiute Parts

LP3905SD-A3

Texas InstrumentsIn Stock: 1257LP3905SD-A3 Datasheet

Current PartRFQ

LP3905SD-A3/NOPB

Texas InstrumentsIn Stock: 2359LP3905SD-A3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3905SD-A3 is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Supply voltage range: 3V ~ 5.5V
• Dual-channel LDO/buck regulator topology
• 600mA per-channel output current capability
• Operating temperature range: -40°C ~ 85°C

Mechanical & Packaging Requirements:

• Package type: 14-WFDFN Exposed Pad
• Supplier device package: 14-WSON (4x4)
• Surface-mount technology
• Moisture sensitivity level: MSL 1

Manufacturer Consistency:

• Original equipment manufacturer: Texas Instruments
• Base product number: LP3905

Substitute parts must satisfy all parameters listed above without deviation. Parts meeting these criteria are classified as direct functional equivalents suitable for drop-in replacement in existing designs and PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

LP3905SD-A3/NOPB is the direct functional equivalent for LP3905SD-A3 applications. Both parts maintain identical electrical and mechanical specifications, ensuring PCB-level compatibility without design modification.

Product Status Consideration: The LP3905SD-A3 is classified as obsolete, while LP3905SD-A3/NOPB maintains active product status. For new designs and production continuity, LP3905SD-A3/NOPB is the appropriate selection.

Compliance Status: LP3905SD-A3/NOPB carries ROHS3 compliance certification, whereas the original LP3905SD-A3 is RoHS non-compliant. Organizations subject to RoHS regulatory requirements must transition to LP3905SD-A3/NOPB.

Supply Chain & Inventory: LP3905SD-A3/NOPB demonstrates superior inventory availability (2300 units) compared to LP3905SD-A3 (1230 units), supporting production scheduling and procurement planning.

Frequently Asked Questions (FAQ)

Q: Can LP3905SD-A3/NOPB replace LP3905SD-A3 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters: supply voltage (3V ~ 5.5V), output current (600mA per channel), operating temperature range (-40°C ~ 85°C), and package type (14-WSON 4x4). No PCB redesign or schematic modification is required.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates the part is supplied without plumbum (lead-free), reflecting RoHS3 compliance. This is a manufacturing and compliance designation; electrical and mechanical function remain unchanged.

Q: Are there differences in thermal or electrical performance between these parts?

A: No differences are specified in the provided parameters. Both parts operate within identical voltage ranges, temperature ranges, and current specifications.

Q: Why is LP3905SD-A3 listed as obsolete?

A: Product obsolescence is determined by the manufacturer. LP3905SD-A3/NOPB is the active replacement, offering equivalent functionality with improved compliance status.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level. These parts require no special moisture-control handling during storage, transportation, or assembly, simplifying supply chain management.

Q: Can these parts be used interchangeably in production?

A: Yes, for applications requiring the specified electrical and mechanical parameters. Verify that your application requirements align with the 3V ~ 5.5V supply voltage range, 600mA per-channel output current, and -40°C ~ 85°C operating temperature range.