CAT3604HV4-T2 Equivalent & Substitute Parts

Part Overview

The CAT3604HV4-T2 is a LED Driver IC manufactured by onsemi, designed for white backlight applications with 4 output switched capacitor (charge pump) topology. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The CAT3604HV4-T2 delivers 30mA per channel output current across a 3V to 5.5V supply range, operating at frequencies between 800kHz and 1.3MHz in a 16-TQFN (4x4) surface mount package.

Substiute Parts

CAT3604HV4-T2

onsemiIn Stock: 973CAT3604HV4-T2 Datasheet

Current PartRFQ

LM27952SD/NOPB

National SemiconductorIn Stock: 8348LM27952SD/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CAT3604HV4-T2 is determined by the following critical parameters:

• Topology: Switched Capacitor (Charge Pump) architecture
• Number of Outputs: 4 independent LED driver channels
• Supply Voltage Range: 3V to 5.5V input compatibility
• Output Current per Channel: 30mA minimum capability
• Operating Temperature Range: -40°C to 85°C
• Mounting Type: Surface Mount configuration
• Application: White LED backlight driving

The LM27952SD/NOPB qualifies as a functional equivalent based on matching these core electrical and mechanical parameters. Both devices employ switched capacitor topology with 4 outputs, identical supply voltage specifications, and equivalent thermal operating ranges. The substitute maintains the 30mA per-channel output current requirement and surface mount implementation necessary for direct functional replacement.

Parameter Comparison

Engineering Selection Recommendations

The LM27952SD/NOPB is an active product from National Semiconductor with equivalent electrical specifications to the obsolete CAT3604HV4-T2. Both devices share identical supply voltage ranges (3V to 5.5V), output current per channel (30mA), operating temperature specifications (-40°C to 85°C), and switched capacitor topology with 4 outputs.

Selection of the LM27952SD/NOPB provides the advantage of active product status, ensuring ongoing availability and manufacturing support. Both components carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, confirming regulatory equivalence.

Package differences exist between the two devices: the CAT3604HV4-T2 uses a 16-TQFN (4x4) package while the LM27952SD/NOPB employs a 14-WSON (4x3) package. PCB layout modifications are required to accommodate the different footprint geometries and pin counts. The LM27952SD/NOPB operates at a fixed frequency of 750kHz, compared to the CAT3604HV4-T2 range of 800kHz to 1.3MHz; this frequency difference falls within acceptable parameters for backlight applications.

Frequently Asked Questions (FAQ)

Q: Can the LM27952SD/NOPB directly replace the CAT3604HV4-T2 without circuit modifications?

A: Electrical substitution is valid based on matching supply voltage, output current, topology, and operating temperature specifications. However, package geometry differs (16-TQFN versus 14-WSON), requiring PCB footprint redesign and potential layout adjustments. Pin configuration must be verified against device datasheets before implementation.

Q: What is the significance of the frequency difference between these devices?

A: The CAT3604HV4-T2 operates across 800kHz to 1.3MHz, while the LM27952SD/NOPB operates at 750kHz. Both frequencies are within acceptable ranges for white LED backlight applications. The fixed frequency of the LM27952SD/NOPB may affect EMI characteristics and power dissipation profiles; circuit simulation is recommended to confirm performance in specific applications.

Q: Are there compliance or regulatory differences between these parts?

A: Both devices carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating regulatory equivalence. Both maintain REACH Unaffected status. No additional compliance documentation is required for substitution from a regulatory standpoint.

Q: What is the impact of the package change on production?

A: The transition from 16-TQFN (4x4) to 14-WSON (4x3) requires PCB redesign, including footprint modification, via placement adjustment, and thermal management review. Assembly process parameters may require requalification. Design validation testing is necessary before production implementation.

Q: Why is the CAT3604HV4-T2 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. The LM27952SD/NOPB, maintained as an active product by National Semiconductor, provides continued design support and manufacturing availability for equivalent functionality.