LP3947ISD-51 Equivalent & Substitute Parts

Part Overview

The LP3947ISD-51 is a single-cell lithium-ion battery charger IC manufactured by Texas Instruments in a 14-WSON (4x4) surface mount package. This device integrates constant-current/constant-voltage charging control with I2C and USB interface capabilities, supporting charge currents up to 750mA and battery pack voltages of 4.2V.

The LP3947ISD-51 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this charger architecture.

Substiute Parts

LP3947ISD-51

Texas InstrumentsIn Stock: 3079LP3947ISD-51 Datasheet

Current PartRFQ

LP3947ISD-51/NOPB

Texas InstrumentsIn Stock: 2308LP3947ISD-51/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3947ISD-51 are identified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

• Battery Chemistry: Lithium Ion
• Number of Cells: 1
• Charge Current - Max: 750mA
• Battery Pack Voltage: 4.2V
• Voltage - Supply (Max): 6V
• Interface: I2C, USB
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 14-WFDFN Exposed Pad
• Mounting Type: Surface Mount
• Fault Protection: Over Voltage

The LP3947ISD-51/NOPB is a direct parametric equivalent manufactured by Texas Instruments. It maintains identical electrical specifications and package configuration. The primary distinction is packaging format and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The LP3947ISD-51/NOPB is the direct parametric equivalent for the obsolete LP3947ISD-51. Both devices share identical electrical specifications, thermal operating range, and package configuration.

The LP3947ISD-51/NOPB carries Last Time Buy status and ROHS3 compliance, making it suitable for new designs or production runs requiring regulatory compliance. The original LP3947ISD-51 is RoHS non-compliant and obsolete, limiting its availability for future procurement.

Selection between these variants depends on supply chain requirements and regulatory compliance mandates. Both maintain functional and electrical interchangeability within the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Can LP3947ISD-51/NOPB directly replace LP3947ISD-51 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters: charge current, battery voltage, supply voltage, interface protocols, operating temperature range, and package configuration. The primary difference is product lifecycle status and RoHS compliance.

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

A: The "/NOPB" suffix designates a packaging variant without plating on the leads. This is a standard Texas Instruments nomenclature distinction and does not affect electrical performance or functional compatibility.

Q: Why is the original LP3947ISD-51 classified as obsolete?

A: Product obsolescence reflects end-of-life status from the manufacturer. The LP3947ISD-51/NOPB remains available as the current equivalent, though also designated Last Time Buy, indicating limited remaining inventory.

Q: Are there alternative charger ICs from other manufacturers that match these specifications?

A: The substitute list references BQ25170DSGR and BQ25176JDSGR as additional alternatives. Verification of electrical and package compatibility against the specified parameters is required for cross-manufacturer substitution.

Q: What is the significance of the 14-WFDFN Exposed Pad package?

A: This package designation specifies a 14-pin Wafer-Level Flip Chip Down-size Fine-pitch No-lead package with an exposed thermal pad. The package footprint and thermal characteristics are critical for PCB layout compatibility. Substitute parts must maintain this exact package specification.

Q: Does RoHS compliance affect functional performance?

A: RoHS compliance reflects manufacturing process and material composition standards, not functional performance. The ROHS3-compliant LP3947ISD-51/NOPB maintains identical electrical specifications to the non-compliant original part.