PCA9635PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9635PW,112 is a 16-output linear LED driver IC manufactured by NXP USA Inc., designed for backlight applications with I2C-based PWM dimming control. This device operates across a 2.3V to 5.5V supply range and delivers 25mA per output channel. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

PCA9635PW,112

NXP USA Inc.In Stock: 1113PCA9635PW,112 Datasheet

Current PartRFQ

TLC5926IPWPR

Texas InstrumentsIn Stock: 4955TLC5926IPWPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9635PW,112 is determined by the following critical parameters:

• Number of Outputs: 16-channel configuration is a primary functional requirement
• Output Current Capability: Minimum 25mA per channel required for backlight applications
• Supply Voltage Range: Must accommodate 2.3V to 5.5V operation
• Dimming Control Method: I2C interface or equivalent digital control
• Package Compatibility: Surface mount TSSOP variants with similar footprint dimensions
• Operating Temperature Range: -40°C to 85°C minimum
• Compliance Standards: ROHS3 compliance and EAR99 classification

The TLC5926IPWPR from Texas Instruments meets the core functional requirements of 16 outputs and surface mount packaging, though with notable differences in output current capability, control topology, and supply voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

The TLC5926IPWPR serves as an active substitute for the obsolete PCA9635PW,112 based on the following engineering criteria:

Functional Equivalence: Both devices provide 16-channel LED driver output with linear topology and surface mount packaging suitable for backlight and signage applications.

Compliance Alignment: Both parts maintain ROHS3 compliance and EAR99 classification, ensuring regulatory continuity in production environments.

Supply Voltage Consideration: The TLC5926IPWPR requires a minimum supply voltage of 3V compared to the PCA9635PW,112's 2.3V minimum. Designs operating below 3V supply voltage cannot use this substitute without additional power conditioning.

Output Current Differential: The TLC5926IPWPR provides 120mA per channel versus 25mA for the original part. This higher current capability accommodates higher-brightness LED applications but requires thermal management review in the target circuit.

Control Interface Difference: The PCA9635PW,112 uses I2C dimming control, while the TLC5926IPWPR employs shift register control. Circuit redesign is necessary to accommodate this control topology change.

Package Footprint: The TLC5926IPWPR uses 24-PowerTSSOP packaging versus the original 28-TSSOP. PCB layout modification is required for this substitution.

Product Status: The TLC5926IPWPR is active production status, ensuring long-term availability and supply chain stability compared to the obsolete PCA9635PW,112.

Frequently Asked Questions (FAQ)

Q: Can the TLC5926IPWPR directly replace the PCA9635PW,112 without circuit modifications?

A: No. The TLC5926IPWPR requires circuit redesign due to differences in control interface (shift register vs. I2C), minimum supply voltage (3V vs. 2.3V), package footprint (24-PowerTSSOP vs. 28-TSSOP), and output current specifications (120mA vs. 25mA).

Q: What is the primary reason for substitution?

A: The PCA9635PW,112 is classified as obsolete. The TLC5926IPWPR is an active production alternative that maintains core functionality (16-channel linear LED driver) while offering enhanced output current capability and long-term supply availability.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the PCA9635PW,112 and TLC5926IPWPR are ROHS3 compliant and classified as EAR99 for export control purposes.

Q: What supply voltage range must be considered for substitution?

A: The TLC5926IPWPR requires a minimum supply voltage of 3V, whereas the original PCA9635PW,112 operates from 2.3V. Designs with supply voltages between 2.3V and 3V cannot use the TLC5926IPWPR without additional power regulation.

Q: How do the output current specifications affect application suitability?

A: The TLC5926IPWPR delivers 120mA per channel compared to 25mA for the PCA9635PW,112. This higher current capability supports higher-brightness LED configurations but requires thermal analysis to ensure the device operates within safe junction temperature limits.

Q: What package considerations apply to this substitution?

A: The original part uses 28-TSSOP packaging while the substitute uses 24-PowerTSSOP. Both are surface mount TSSOP variants with 0.173" width and 4.40mm body width, but pin count and layout differ, requiring PCB redesign.

Q: Is the shift register control interface compatible with I2C-based designs?

A: No. The control interfaces are fundamentally different. I2C is a two-wire serial protocol, while shift register control uses serial data input with clock and latch signals. Firmware and circuit modifications are necessary for compatibility.