LP55281RL/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP55281RL/NOPB is a 12-output LED driver IC with integrated DC-DC step-up (boost) regulator manufactured by Texas Instruments. This device is designed for backlight applications, featuring I2C and SPI dimming control with 40mA per-channel output capability. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain identical electrical and mechanical specifications while offering different packaging configurations and active product status options.

Substiute Parts

LP55281RL/NOPB

Texas InstrumentsIn Stock: 18376LP55281RL/NOPB Datasheet

Current PartRFQ

LP55281RLX/NOPB

Texas InstrumentsIn Stock: 26778LP55281RLX/NOPB Datasheet

Parametric EquivalentRFQ

LP55281TL/NOPB

Texas InstrumentsIn Stock: 1491LP55281TL/NOPB Datasheet

Parametric EquivalentRFQ

LP55281TLX/NOPB

Texas InstrumentsIn Stock: 269071LP55281TLX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

All substitute parts for the LP55281RL/NOPB are parametric equivalents from Texas Instruments sharing the base product number LP55281. Substitution eligibility is determined by the following criteria:

• Identical electrical specifications: 12 outputs, 3V-5.5V supply range, 4V-5.3V output range, 40mA per channel, 2MHz frequency
• Identical control interfaces: I2C and SPI dimming capability
• Identical package type: 36-DSBGA (4.6x3.24mm) with 36-WFBGA, DSBGA case designation
• Identical thermal and compliance ratings: -30°C to 85°C operating range, ROHS3 compliant, MSL 1

Substitute parts differ only in packaging configuration (Tape & Reel, Cut Tape & Digi-Reel) and product status (Active vs. Obsolete). These differences do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing production, LP55281TLX/NOPB is the preferred selection. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. The Cut Tape & Digi-Reel packaging accommodates both automated assembly and manual component handling.

LP55281TL/NOPB provides an alternative active-status option with Tape & Reel packaging, suitable for high-volume automated production environments.

LP55281RLX/NOPB and LP55281RL/NOPB are obsolete variants. These parts are electrically and mechanically identical to active alternatives but carry obsolescence risk. Selection of these parts should be limited to legacy system maintenance where supply chain continuity has been verified.

All substitute parts carry ROHS3 compliance and MSL 1 rating, meeting standard industrial compliance requirements for backlight driver applications.

Frequently Asked Questions (FAQ)

Q: Are all LP55281 variants pin-compatible? A: Yes. All listed parts use the 36-DSBGA package with identical pinout and electrical characteristics. Direct substitution is possible without circuit board redesign.

Q: What is the difference between LP55281TLX/NOPB and LP55281TL/NOPB? A: Both parts are electrically identical with active product status. The difference is packaging format: LP55281TLX/NOPB uses Cut Tape & Digi-Reel packaging, while LP55281TL/NOPB uses standard Tape & Reel. Selection depends on assembly process requirements.

Q: Can I use LP55281RLX/NOPB as a long-term replacement for LP55281RL/NOPB? A: Both parts are obsolete. While electrically equivalent, neither offers long-term supply assurance. For new production, select an active-status variant (LP55281TL/NOPB or LP55281TLX/NOPB).

Q: Does packaging format affect electrical performance? A: No. Packaging format (tube, tape & reel, cut tape) affects only handling and assembly logistics. Electrical specifications and performance are identical across all variants.

Q: Are there any thermal or compliance differences between substitute parts? A: No. All parts share identical operating temperature range (-30°C to 85°C), RoHS3 compliance, and MSL 1 rating. Thermal and compliance characteristics are uniform across the LP55281 family.

Q: What does "obsolete" product status mean for component selection? A: Obsolete status indicates Texas Instruments has discontinued active production and support. While existing inventory may be available, future availability is not guaranteed. Active-status parts (LP55281TL/NOPB, LP55281TLX/NOPB) are recommended for designs requiring long-term component availability.