UCC35705P Equivalent & Substitute Parts

Part Overview

The UCC35705P is a DC-DC controller IC from Texas Instruments designed for multiple converter topologies including Boost, Flyback, and Forward Converter applications. It functions as a transistor driver for step-up and step-up/step-down power conversion with positive, isolation-capable output configuration. The UCC35705P is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The primary substitute maintains identical electrical specifications while offering improved product status and availability.

Substiute Parts

UCC35705P

Texas InstrumentsIn Stock: 5302UCC35705P Datasheet

Current PartRFQ

UCC35705D

Texas InstrumentsIn Stock: 759UCC35705D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between UCC35705P and UCC35705D is based on electrical and functional equivalence. Both parts share identical core specifications:

• Voltage supply range: 8.2V ~ 15V
• Switching frequency: 1MHz
• Maximum duty cycle: 93%
• Operating temperature: 0°C ~ 70°C
• Control features: Current Limit
• Output configuration: Positive, Isolation Capable
• Topology support: Boost, Flyback, Forward Converter
• Regulatory compliance: ROHS3 and REACH equivalence

The primary difference is packaging format: UCC35705P uses 8-DIP (through-hole) while UCC35705D uses 8-SOIC (surface mount). Both packages contain identical die and electrical functionality, making them functionally interchangeable when PCB layout accommodates the package change.

Parameter Comparison

Engineering Selection Recommendations

UCC35705D is the recommended substitute for UCC35705P based on the following criteria:

Product Status: UCC35705D carries Active status while UCC35705P is Obsolete. Active status ensures continued manufacturer support, availability, and compliance with current regulatory requirements.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and hazardous substance directives.

Electrical Equivalence: Identical specifications across all functional parameters—supply voltage, switching frequency, duty cycle, operating temperature, and control features—ensure direct functional replacement in circuit designs.

Package Consideration: Selection between DIP and SOIC packaging depends on PCB design requirements. Through-hole (DIP) mounting suits breadboard prototyping and legacy designs, while surface-mount (SOIC) is standard for modern production boards and reduces PCB footprint.

Moisture Sensitivity: UCC35705D specifies MSL 2 (1 Year) versus UCC35705P's MSL 1 (Unlimited). This difference requires standard moisture control during storage and handling for the substitute part.

Frequently Asked Questions (FAQ)

Q: Can UCC35705D directly replace UCC35705P in existing designs?

A: Electrical replacement is direct—all functional parameters are identical. Physical replacement requires PCB layout modification to accommodate the package change from 8-DIP to 8-SOIC. Pin-to-pin functionality remains unchanged.

Q: What is the primary reason to substitute UCC35705P with UCC35705D?

A: UCC35705P is obsolete, limiting future availability and manufacturer support. UCC35705D maintains active product status with equivalent electrical specifications, ensuring long-term supply chain reliability.

Q: Are there differences in thermal or electrical performance between the packages?

A: Both packages contain identical die and electrical characteristics. Package differences affect PCB layout, mounting process, and thermal dissipation path design, not the IC's electrical performance specifications.

Q: What moisture handling is required for UCC35705D?

A: UCC35705D specifies MSL 2 (1 Year), requiring standard moisture control during storage. Parts must be stored in dry conditions and used within one year of packaging. Standard industry moisture barrier bags and desiccant are appropriate.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both UCC35705P and UCC35705D are ROHS3 compliant and REACH unaffected, meeting current EU and international environmental directives for hazardous substance restrictions.