UC2866N Equivalent & Substitute Parts

Part Overview

The UC2866N is an offline switch controller IC manufactured by Texas Instruments, designed for power management applications utilizing full-bridge, half-bridge, and push-pull topologies. This 16-PDIP through-hole component operates across a switching frequency range of 10kHz to 1MHz with a supply voltage range of 10.5V to 22V. The product is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

UC2866N

Texas InstrumentsIn Stock: 803UC2866N Datasheet

Current PartRFQ

UCC28950PW

Texas InstrumentsIn Stock: 1395UCC28950PW Datasheet

MFR RecommendedRFQ

SG1548J

Microchip TechnologyIn Stock: 1426SG1548J Datasheet

MFR RecommendedRFQ

TEA1716T/2,518

NXP USA Inc.In Stock: 12174TEA1716T/2,518 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UC2866N are selected based on functional topology compatibility, supply voltage overlap, switching frequency capability, and control feature alignment. The primary substitution criteria are:

Topology Compatibility: The UC2866N supports full-bridge, half-bridge, and push-pull topologies. Substitute parts must support at least one of these topologies to maintain circuit functionality.

Supply Voltage Range: The UC2866N operates with a supply voltage of 10.5V to 22V. Substitute parts must have overlapping or encompassing supply voltage ranges to ensure proper operation in existing designs.

Switching Frequency Range: The UC2866N operates from 10kHz to 1MHz. Substitute parts must support switching frequencies within or compatible with this range.

Control Features: The UC2866N includes soft start functionality. Substitute parts should provide equivalent control features for circuit stability.

Package and Mounting: While the UC2866N uses through-hole 16-PDIP packaging, substitute parts may use alternative packages (surface mount or different pin counts) if the functional requirements are met. Design modifications may be required for package changes.

Compliance and Status: Active product status and ROHS3 compliance are preferred for long-term availability and regulatory adherence.

Parameter Comparison

Engineering Selection Recommendations

UCC28950PW (Texas Instruments): This part provides the closest functional alignment to the UC2866N, offering full-bridge topology support with an overlapping supply voltage range of 8V to 17V and switching frequency capability of 50kHz to 1MHz. The UCC28950PW is an active product with ROHS3 compliance, ensuring long-term availability and regulatory adherence. The primary design consideration is the transition from 16-PDIP through-hole to 24-TSSOP surface-mount packaging, which requires PCB layout modifications. The extended operating temperature range (-40°C to 125°C) provides improved thermal performance compared to the UC2866N.

SG1548J (Microchip Technology): This part functions as a power supply monitor and controller with a wide supply voltage range of 4.5V to 35V, encompassing the UC2866N operating range. However, the SG1548J is classified as RoHS non-compliant, which may present regulatory constraints for new designs. The part maintains through-hole 16-CDIP packaging, minimizing PCB layout changes. This option is suitable for legacy system maintenance where RoHS compliance is not a requirement.

TEA1716T/2,518 (NXP USA Inc.): This part is a PFC (Power Factor Correction) controller operating in discontinuous conduction mode, designed for AC input applications (70 to 276 VAC). The functional scope differs significantly from the UC2866N, as it is optimized for power factor correction rather than general offline switching control. This part is suitable only for applications requiring PFC functionality and is not recommended as a direct functional substitute for standard offline switch applications. The part is ROHS3 compliant and active, with an extended operating temperature range of -40°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can the UCC28950PW directly replace the UC2866N without circuit modifications?

A: The UCC28950PW provides functional topology compatibility (full-bridge) and overlapping supply voltage and switching frequency ranges. However, the package transition from 16-PDIP through-hole to 24-TSSOP surface-mount requires PCB layout modifications. Pin-to-pin compatibility must be verified against the specific application schematic before implementation.

Q: Why is the SG1548J listed as a substitute if it is RoHS non-compliant?

A: The SG1548J is included as a substitute option for legacy system maintenance and repair applications where RoHS compliance is not a regulatory requirement. For new designs, ROHS3-compliant alternatives such as the UCC28950PW or TEA1716T/2,518 are recommended.

Q: Is the TEA1716T/2,518 suitable for applications that do not require power factor correction?

A: The TEA1716T/2,518 is specifically designed for PFC applications and operates on AC input voltage (70 to 276 VAC). It is not recommended as a substitute for the UC2866N in standard offline switching applications that do not require PFC functionality. The UCC28950PW is the more appropriate choice for such applications.

Q: What are the key differences in operating temperature ranges between the UC2866N and its substitutes?

A: The UC2866N operates from -25°C to 85°C. The UCC28950PW extends this range to -40°C to 125°C, and the TEA1716T/2,518 extends it further to -40°C to 150°C. The SG1548J operates from -55°C to 125°C. Extended temperature ranges provide improved performance in demanding thermal environments.

Q: Are there any supply voltage compatibility concerns when substituting the UC2866N?

A: The UC2866N operates at 10.5V to 22V. The UCC28950PW operates at 8V to 17V, which overlaps the lower portion of the UC2866N range but does not extend to the full 22V maximum. The SG1548J operates at 4.5V to 35V, fully encompassing the UC2866N range. Application-specific voltage requirements must be verified before selection.

Q: What mounting and packaging considerations apply to these substitutes?

A: The UC2866N uses through-hole 16-PDIP packaging. The UCC28950PW and TEA1716T/2,518 use surface-mount packages (24-TSSOP and 24-SOIC respectively), requiring PCB redesign. The SG1548J maintains through-hole 16-CDIP packaging, minimizing layout changes. Package selection depends on PCB design constraints and manufacturing capabilities.