LP39542TL/NOPB Equivalent & Substitute Parts

Part Overview

The LP39542TL/NOPB is a 13-output LED driver IC with integrated DC-DC boost regulator and PWM dimming capability, manufactured by Texas Instruments in a 36-DSBGA package. This component is designed for backlight and camera flash applications requiring high-current LED drive capability. The part is currently obsolete, making equivalent and substitute parts essential for ongoing system support and new design alternatives.

Substiute Parts

LP39542TL/NOPB

Texas InstrumentsIn Stock: 973LP39542TL/NOPB Datasheet

Current PartRFQ

LP3954TL/NOPB

National SemiconductorIn Stock: 4286LP3954TL/NOPB Datasheet

Parametric EquivalentRFQ

LP3954TLX/NOPB

Texas InstrumentsIn Stock: 2491LP3954TLX/NOPB Datasheet

Parametric EquivalentRFQ

LTC3207EUF-1#PBF

Analog Devices Inc.In Stock: 1522LTC3207EUF-1#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP39542TL/NOPB is determined by the following critical parameters:

Parametric Equivalents (LP3954TL/NOPB, LP3954TLX/NOPB): These parts maintain identical electrical specifications across all key parameters—13 outputs, 3V to 5.5V supply range, 4V to 5.3V output range, 900mA per-channel current, 2MHz switching frequency, PWM dimming, and 36-DSBGA packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (Bulk vs. Tape & Reel).

Manufacturer Recommended Substitute (LTC3207EUF-1#PBF): This part shares the 13-output LED driver function and similar supply voltage range (2.9V to 5.5V) but differs in topology (Switched Capacitor vs. Boost), dimming method (Analog vs. PWM), current capability (50mA/425mA vs. 900mA), switching frequency (850kHz vs. 2MHz), and package type (24-QFN vs. 36-DSBGA). This substitute is suitable only when application requirements permit topology and dimming method changes.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Electrical Equivalent): LP3954TL/NOPB and LP3954TLX/NOPB are parametric equivalents suitable for direct substitution. Both maintain identical electrical performance and package footprint. LP3954TLX/NOPB is available in Tape & Reel format, preferred for production environments. Both parts are Active status, ensuring long-term availability and supply chain stability compared to the obsolete LP39542TL/NOPB.

For Alternative Design Implementation: LTC3207EUF-1#PBF is a manufacturer-recommended substitute when application requirements permit changes to topology, dimming method, and current distribution. This part operates on Switched Capacitor topology with Analog dimming instead of PWM, and distributes current differently (50mA/425mA channels vs. 900mA uniform). The 24-QFN package requires PCB layout redesign. This option is suitable only for new designs or systems where the functional differences are acceptable.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 export classification. MSL rating of 1 (Unlimited) is consistent across all parts, eliminating moisture sensitivity concerns during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can LP3954TL/NOPB and LP3954TLX/NOPB be used interchangeably with LP39542TL/NOPB? A: Yes. Both parts are parametric equivalents with identical electrical specifications and 36-DSBGA packaging. The difference is packaging format (Bulk vs. Tape & Reel) and product status (Active). LP3954TLX/NOPB in Tape & Reel format is preferred for production use.

Q: What are the key differences between the boost regulator substitutes and the LTC3207EUF-1#PBF? A: The LTC3207EUF-1#PBF uses Switched Capacitor topology instead of Boost, supports Analog dimming instead of PWM, provides lower per-channel current (50mA/425mA vs. 900mA), and uses a different package (24-QFN vs. 36-DSBGA). These differences require circuit redesign and are not pin-compatible.

Q: Is the LTC3207EUF-1#PBF suitable for existing LP39542TL/NOPB designs? A: No. The LTC3207EUF-1#PBF requires PCB layout changes, firmware modifications for Analog dimming control, and system validation due to different current distribution and switching frequency. This part is suitable only for new designs where these differences are acceptable.

Q: What is the inventory status of substitute parts? A: LP3954TL/NOPB has 4188 units in stock. LP3954TLX/NOPB has 2400 units in stock. LTC3207EUF-1#PBF has 1442 units in stock. All are available as new original components.

Q: Are all substitute parts RoHS3 compliant? A: LP3954TLX/NOPB and LTC3207EUF-1#PBF are explicitly ROHS3 compliant. RoHS status for LP3954TL/NOPB is not specified in available documentation.

Q: What is the operating temperature range for each substitute? A: LP3954TL/NOPB and LP3954TLX/NOPB operate from -30°C to 85°C, matching the original part. LTC3207EUF-1#PBF operates from -40°C to 85°C, providing extended low-temperature capability.