PCA9955ATWJ LED Driver IC - Equivalent & Substitute Parts

Part Overview

The PCA9955ATWJ is a 16-output linear LED driver IC manufactured by NXP USA Inc., designed for backlight applications requiring I2C-based dimming control. This device operates across a 3V to 5.5V supply range and delivers 57mA per output channel in a 28-HTSSOP surface mount package.

The PCA9955ATWJ is classified as obsolete. For new designs and ongoing production requirements, identifying compatible substitute parts is essential to ensure supply chain continuity and maintain design specifications.

Substiute Parts

PCA9955ATWJ

NXP USA Inc.In Stock: 713PCA9955ATWJ Datasheet

Current PartRFQ

PCA9955BTWJ

NXP SemiconductorsIn Stock: 2732PCA9955BTWJ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9955ATWJ is determined by the following critical parameters:

• Package Compatibility: 28-HTSSOP surface mount package with identical pinout and exposed pad configuration
• Output Configuration: 16 output channels for LED driving
• Supply Voltage Range: 3V to 5.5V operation
• Operating Temperature Range: -40°C to 85°C
• Regulatory Compliance: ROHS3 compliance and MSL Level 1 rating
• Current Delivery: Output current per channel must meet or exceed application requirements

The PCA9955BTWJ qualifies as a direct substitute based on matching package, output count, supply voltage range, temperature rating, and regulatory compliance. The increased current rating (65mA vs. 57mA per channel) provides enhanced capability for higher-brightness LED applications.

Parameter Comparison

Engineering Selection Recommendations

The PCA9955BTWJ is the qualified substitute for the obsolete PCA9955ATWJ. Both devices share identical package geometry, pinout, supply voltage specifications, and operating temperature range. The PCA9955BTWJ maintains full ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with existing manufacturing and environmental requirements.

The PCA9955BTWJ carries active product status, providing assured long-term availability and supply chain stability. The increased output current specification (65mA per channel versus 57mA) represents an enhancement that supports higher LED brightness levels without requiring circuit redesign.

For applications currently using the PCA9955ATWJ, direct substitution with the PCA9955BTWJ is permissible without PCB layout modifications or firmware changes, provided that thermal management remains adequate for the increased current delivery capability.

Frequently Asked Questions (FAQ)

Q: Can the PCA9955BTWJ replace the PCA9955ATWJ in existing designs?

A: Yes. Both devices use the 28-HTSSOP package with identical pinout and pad configuration. Supply voltage ranges, operating temperature specifications, and regulatory compliance are equivalent. The PCA9955BTWJ's higher output current rating (65mA vs. 57mA per channel) is a functional enhancement that does not require design changes.

Q: What is the primary reason for substitution?

A: The PCA9955ATWJ is classified as obsolete. The PCA9955BTWJ is an active product from the same manufacturer family, ensuring continued availability and supply chain reliability.

Q: Are there any thermal considerations when switching to the PCA9955BTWJ?

A: The PCA9955BTWJ delivers higher current per output channel. Thermal management design should account for increased power dissipation, particularly in applications driving all 16 outputs at maximum current. PCB copper area and thermal vias should be evaluated based on final application current requirements.

Q: Do both parts require identical PCB footprints?

A: Yes. Both the PCA9955ATWJ and PCA9955BTWJ use the 28-TSSOP package with 0.173" width and exposed pad. PCB footprints are interchangeable without modification.

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

A: No. Both devices are ROHS3 compliant with MSL Level 1 rating. Regulatory and environmental certifications are equivalent.