UCC25705P Equivalent & Substitute Parts

Part Overview

The UCC25705P is a high-speed voltage mode DC-DC controller IC manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies. It functions as a transistor driver for step-up and step-up/step-down applications with positive, isolation-capable output configuration. The UCC25705P is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is available in 8-DIP through-hole packaging with 3,300 units currently in stock.

Substiute Parts

UCC25705P

Texas InstrumentsIn Stock: 3376UCC25705P Datasheet

Current PartRFQ

UCC25705D

UnitrodeIn Stock: 3249UCC25705D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC25705P is based on strict equivalence of the following electrical and mechanical parameters:

• Base product number (UCC25705 series)
• Output type and function (transistor driver for step-up/step-up-step-down topologies)
• Supported converter topologies (boost, flyback, forward converter)
• Output configuration (positive, isolation capable)
• Supply voltage range (8.2V ~ 15V)
• Switching frequency (1MHz)
• Maximum duty cycle (93%)
• Control features (current limit)
• Operating temperature range (-40°C ~ 85°C)
• Compliance certifications (RoHS3, REACH, EAR99)

The UCC25705D is qualified as a direct substitute based on identical electrical specifications and functional characteristics. The primary difference is packaging format: the main part uses 8-DIP through-hole mounting, while the substitute uses 8-SOIC surface-mount packaging. Both variants share the same base product number and core controller functionality.

Parameter Comparison

Engineering Selection Recommendations

The UCC25705D is the qualified substitute for the obsolete UCC25705P. Both parts share identical electrical specifications, functional characteristics, and control features required for boost, flyback, and forward converter applications.

The primary selection criterion is packaging format. The UCC25705P uses 8-DIP through-hole mounting suitable for breadboard prototyping and through-hole PCB designs. The UCC25705D uses 8-SOIC surface-mount packaging, appropriate for automated assembly and compact PCB layouts.

The UCC25705D carries active product status from Unitrode, ensuring ongoing availability and supply chain continuity compared to the obsolete UCC25705P. Both parts comply with EAR99 export classification and share identical HTSUS commodity codes.

PCB layout modifications are required when transitioning from through-hole to surface-mount packaging. Pin-to-pin electrical compatibility is maintained across both package formats.

Frequently Asked Questions (FAQ)

Q: Can the UCC25705D directly replace the UCC25705P without circuit modifications?

A: Electrical and functional compatibility is complete. Pin-to-pin functionality is identical. PCB layout and footprint changes are required due to different package formats (8-DIP through-hole versus 8-SOIC surface-mount). Schematic connections remain unchanged.

Q: What is the primary reason for substitution?

A: The UCC25705P is classified as obsolete. The UCC25705D is the active equivalent with identical electrical specifications and control features.

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

A: Both parts share EAR99 export classification and identical HTSUS codes (8542.39.0001). RoHS3 compliance is confirmed for the UCC25705P; compliance status for the UCC25705D is not specified in available documentation.

Q: What are the key electrical parameters that define substitution eligibility?

A: Supply voltage range (8.2V ~ 15V), switching frequency (1MHz), maximum duty cycle (93%), output configuration (positive, isolation capable), supported topologies (boost, flyback, forward converter), and operating temperature range (-40°C ~ 85°C) must remain identical.

Q: Are there inventory considerations for component selection?

A: The UCC25705P has 3,300 units in stock (obsolete status). The UCC25705D has 3,204 units in stock (active status). Active product status provides superior long-term supply chain reliability.