LP3947ISD-09 Equivalent & Substitute Parts

Part Overview

The LP3947ISD-09 is a single-cell lithium-ion battery charger IC manufactured by Texas Instruments, housed in a 14-WSON (4x4) package with exposed pad. 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 4.1V. The LP3947ISD-09 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

LP3947ISD-09

Texas InstrumentsIn Stock: 775LP3947ISD-09 Datasheet

Current PartRFQ

LP3947ISD-09/NOPB

Texas InstrumentsIn Stock: 1225LP3947ISD-09/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3947ISD-09 is determined by strict equivalence across the following critical parameters:

• Battery chemistry and cell count (Lithium Ion, 1 cell)
• Maximum charge current capability (750mA)
• Battery pack voltage rating (4.1V)
• Maximum supply voltage (6V)
• Communication interfaces (I2C, USB)
• Operating temperature range (-40°C ~ 85°C)
• Package type and pin configuration (14-WFDFN Exposed Pad)
• Fault protection features (Over Voltage)

The LP3947ISD-09/NOPB qualifies as a direct substitute, maintaining identical electrical specifications and package configuration while differing only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The LP3947ISD-09/NOPB is the direct active equivalent for the obsolete LP3947ISD-09. Both parts maintain identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility. The primary distinction is product status: the LP3947ISD-09/NOPB is currently in active production, whereas the LP3947ISD-09 is obsolete.

An additional consideration is regulatory compliance. The LP3947ISD-09/NOPB achieves ROHS3 compliance, whereas the original LP3947ISD-09 is RoHS non-compliant. For applications subject to RoHS requirements, the LP3947ISD-09/NOPB is the appropriate selection.

Packaging format differs between the two parts: the LP3947ISD-09/NOPB is supplied in Tape & Reel format, standard for production environments, while the original part was supplied in bulk packaging. This distinction affects procurement and assembly processes but does not impact electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can LP3947ISD-09/NOPB be used as a direct replacement for LP3947ISD-09?

A: Yes. Both parts are electrically and mechanically identical. The LP3947ISD-09/NOPB is the active production equivalent and is fully compatible with designs originally specified for the LP3947ISD-09.

Q: What is the difference between LP3947ISD-09 and LP3947ISD-09/NOPB?

A: The parts are functionally equivalent. Differences include product status (Obsolete versus Active), RoHS compliance (non-compliant versus ROHS3 Compliant), and packaging format (Bulk versus Tape & Reel). The "/NOPB" suffix indicates lead-free, RoHS-compliant packaging.

Q: Are there any package or pinout differences?

A: No. Both parts use the 14-WFDFN Exposed Pad package with identical pinout and mechanical dimensions. Surface mount assembly processes remain unchanged.

Q: Which part should be specified for new designs?

A: The LP3947ISD-09/NOPB should be specified for new designs. It is in active production and meets current regulatory compliance standards.

Q: Is the operating temperature range identical?

A: Yes. Both parts operate across the same temperature range of -40°C to 85°C (TA).

Q: Do both parts support the same interfaces and protocols?

A: Yes. Both parts provide I2C and USB interfaces with identical functional capabilities.