UCC2895N Equivalent & Substitute Parts

Part Overview

The UCC2895N is a phase-shifted full-bridge regulator positive output DC-DC controller IC manufactured by Texas Instruments in a 20-PDIP through-hole package. This device functions as an offline switched-mode power supply controller with integrated frequency control, soft start, and synchronization capabilities. The UCC2895N is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring this controller topology.

Substiute Parts

UCC2895N

Texas InstrumentsIn Stock: 3841UCC2895N Datasheet

Current PartRFQ

UCC28951PWR

Texas InstrumentsIn Stock: 2037UCC28951PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The UCC28951PWR is identified as the manufacturer-recommended substitute for the UCC2895N. Substitution eligibility is determined by the following critical parameters:

Topology Compatibility: Both devices implement full-bridge regulator topologies with positive output configuration, maintaining functional equivalence in power conversion architecture.

Control Interface: Both parts feature clock synchronization, frequency control, and soft start capabilities, ensuring compatible control signal requirements and system integration.

Supply Voltage Range: The UCC28951PWR operates within 8V ~ 17V, which encompasses the UCC2895N supply range of 10V ~ 16.5V, providing compatible power supply requirements.

Switching Frequency: Both devices support operation up to 1MHz, maintaining equivalent frequency performance characteristics.

Output Configuration: Both devices deliver positive output configuration with single-output topology, ensuring compatible power delivery architecture.

Compliance & Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying equivalent regulatory requirements.

Functional Differences: The UCC28951PWR provides enhanced specifications including higher maximum operating temperature (125°C vs. 85°C), active product status (vs. Last Time Buy), and surface-mount packaging (vs. through-hole), representing a technology advancement rather than a direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

For Continued UCC2895N Deployment: The UCC2895N remains available with 3753 pieces in current inventory. Designs currently utilizing this device may continue procurement while Last Time Buy status is active. Through-hole mounting compatibility with existing PCB layouts is maintained.

For New Design Implementation: The UCC28951PWR is the manufacturer-recommended substitute and carries Active product status, ensuring long-term availability and supply chain continuity. This device is suitable for new designs and redesigns requiring full-bridge regulator controller functionality.

Regulatory Compliance: Both devices satisfy ROHS3 and REACH requirements, supporting equivalent compliance obligations in regulated markets.

Temperature Performance: The UCC28951PWR provides extended operating temperature range (-40°C ~ 125°C junction temperature) compared to the UCC2895N (-40°C ~ 85°C ambient temperature), offering enhanced thermal performance for demanding applications.

Packaging Transition: Migration from through-hole (20-DIP) to surface-mount (24-TSSOP) packaging requires PCB redesign. This transition is appropriate for new product development cycles and manufacturing process optimization.

Frequently Asked Questions (FAQ)

Q: Can the UCC28951PWR directly replace the UCC2895N in existing designs?

A: The UCC28951PWR is functionally equivalent in topology, control features, and supply voltage range. However, packaging differs (24-TSSOP surface-mount vs. 20-DIP through-hole), requiring PCB layout modification. Pin-to-pin compatibility must be verified against specific application schematics before implementation.

Q: What are the key substitution criteria for these devices?

A: Substitution is valid based on matching topology (full-bridge), output configuration (positive), control features (frequency control, soft start, clock sync), and supply voltage range compatibility (8V ~ 17V encompasses 10V ~ 16.5V). Both devices maintain equivalent regulatory compliance.

Q: Why does the UCC28951PWR have a lower maximum duty cycle (95% vs. 100%)?

A: This specification difference reflects design optimization in the newer device. Application-specific duty cycle requirements must be evaluated to determine if 95% maximum duty cycle is acceptable for the intended power conversion topology.

Q: Is the UCC28951PWR suitable for high-temperature applications?

A: Yes. The UCC28951PWR operates to 125°C junction temperature, compared to the UCC2895N at 85°C ambient temperature, providing superior thermal performance for elevated-temperature environments.

Q: What inventory considerations apply to these parts?

A: The UCC2895N has 3753 pieces available under Last Time Buy status. The UCC28951PWR has 2000 pieces in stock with Active product status, ensuring ongoing availability for future procurement cycles.

Q: Are there package-related design considerations for substitution?

A: Yes. The UCC2895N uses 20-DIP through-hole packaging (0.300" pitch), while the UCC28951PWR uses 24-TSSOP surface-mount packaging (0.173" width). PCB footprint, assembly process, and thermal management strategies require redesign for the surface-mount alternative.