LP55281RLX/NOPB Equivalent & Substitute Parts

Part Overview

The LP55281RLX/NOPB is a 12-output LED driver IC with integrated DC-DC step-up (boost) regulator manufactured by Texas Instruments. This component is designed for backlight applications requiring I2C and SPI dimming control with 40mA per-channel output capability. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	12
Voltage Supply Range	3V to 5.5V
Voltage Output Range	4V to 5.3V
Current per Channel	40mA
Switching Frequency	2MHz
Dimming Interface	I2C, SPI
Package Type	36-DSBGA (4.6x3.24mm)
Operating Temperature	-30°C to 85°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP55281RLX/NOPB are identified based on matching the following critical electrical and mechanical parameters:

Base product number: LP55281
Number of outputs: 12
Topology: Step-Up (Boost) with internal switch
Supply voltage range: 3V to 5.5V
Output voltage range: 4V to 5.3V
Per-channel current: 40mA
Switching frequency: 2MHz
Dimming control: I2C and SPI
Package: 36-DSBGA
Operating temperature range: -30°C to 85°C

The LP55281TL/NOPB and LP55281TLX/NOPB variants meet all these parameters and differ only in packaging format (tape & reel versus cut tape with Digi-Reel) and product status. Both active substitutes are manufactured by Texas Instruments and maintain full electrical and functional equivalence to the obsolete LP55281RLX/NOPB.

Parameter Comparison

Parameter	LP55281RLX/NOPB	LP55281TL/NOPB	LP55281TLX/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Internal Switch	Yes	Yes	Yes
Number of Outputs	12	12	12
Voltage Supply (Min)	3V	3V	3V
Voltage Supply (Max)	5.5V	5.5V	5.5V
Voltage Output	4V to 5.3V	4V to 5.3V	4V to 5.3V
Current per Channel	40mA	40mA	40mA
Frequency	2MHz	2MHz	2MHz
Dimming Control	I2C, SPI	I2C, SPI	I2C, SPI
Package / Case	36-WFBGA, DSBGA	36-WFBGA, DSBGA	36-WFBGA, DSBGA
Operating Temperature	-30°C to 85°C	-30°C to 85°C	-30°C to 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The LP55281RLX/NOPB is obsolete and should be replaced with either the LP55281TL/NOPB or LP55281TLX/NOPB. Both substitutes are active products from Texas Instruments with identical electrical specifications and functional performance.

Selection between the two active alternatives depends on packaging and supply chain requirements:

LP55281TL/NOPB: Select for standard tape & reel packaging compatible with conventional pick-and-place assembly equipment.
LP55281TLX/NOPB: Select for cut tape with Digi-Reel packaging, offering flexibility for lower-volume or mixed-component assembly operations. This variant has significantly higher inventory availability (269,025 units versus 1,400 units).

Both parts maintain full ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status. No design modifications or PCB layout changes are required when substituting either active part for the obsolete LP55281RLX/NOPB.

Frequently Asked Questions (FAQ)

Q: Can LP55281TL/NOPB and LP55281TLX/NOPB be used interchangeably with LP55281RLX/NOPB?

A: Yes. Both active substitutes are electrically and functionally identical to the obsolete LP55281RLX/NOPB. The differences are limited to packaging format (tape & reel versus cut tape with Digi-Reel) and product status. No circuit modifications are required.

Q: What is the difference between LP55281TL/NOPB and LP55281TLX/NOPB?

A: The primary difference is packaging format. LP55281TL/NOPB is supplied in standard tape & reel format. LP55281TLX/NOPB is supplied in cut tape with Digi-Reel format. Electrical specifications and performance are identical.

Q: Are there any compliance or certification differences between the three parts?

A: No. All three parts share identical RoHS3 compliance, MSL 1 rating, REACH unaffected status, and ECCN/HTSUS classifications.

Q: Which substitute should be selected for new designs?

A: Either LP55281TL/NOPB or LP55281TLX/NOPB is acceptable. Selection should be based on assembly equipment compatibility and supply chain availability. The LP55281TLX/NOPB currently has higher inventory levels.

Q: Is the 36-DSBGA package identical across all three parts?

A: Yes. All three parts use the 36-DSBGA package with dimensions of 4.6x3.24mm. PCB footprints and land patterns are identical.

Q: What is the operating temperature range for these parts?

A: All three parts operate from -30°C to 85°C (TA). This range is identical across LP55281RLX/NOPB, LP55281TL/NOPB, and LP55281TLX/NOPB.

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