TOP250YN Equivalent & Substitute Parts

Part Overview

The TOP250YN is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, housed in a TO-220-7C package. This device integrates a 700V power switch with frequency control and comprehensive fault protection for isolated power supply applications. The TOP250YN is classified as "Not For New Designs," making identification of suitable alternatives essential for ongoing production and maintenance applications. The 290W power rating and 66kHz to 132kHz switching frequency range define its operational envelope for replacement consideration.

Substiute Parts

TOP250YN

Power IntegrationsIn Stock: 1875TOP250YN Datasheet

Current PartRFQ

TOP261YN

Power IntegrationsIn Stock: 1444TOP261YN Datasheet

SimilarRFQ

TOP248YN

Power IntegrationsIn Stock: 5498TOP248YN Datasheet

Parametric EquivalentRFQ

TOP249YN

Power IntegrationsIn Stock: 24211TOP249YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP250YN is determined by strict alignment with the following critical parameters:

Package Compatibility: All substitute parts must use the TO-220-7C package with 6 leads and through-hole mounting to ensure direct PCB compatibility without layout modifications.

Electrical Specifications: Substitute parts must maintain 700V breakdown voltage rating and isolated output topology to preserve circuit isolation requirements. Switching frequency range, duty cycle, and power rating variations are permissible within the constraints of the application's design envelope.

Fault Protection: All candidates must include current limiting, over-temperature, and over-voltage protection to maintain equivalent safety functionality.

Compliance & Status: RoHS compliance and REACH unaffected status are mandatory for regulatory alignment.

The TOP250YN accepts three substitute parts: TOP261YN, TOP248YN, and TOP249YN. These parts share identical package specifications, voltage ratings, isolation characteristics, and protection features. Differences in power rating, switching frequency, and duty cycle reflect design variations within the TOPSwitch family that accommodate different application requirements while maintaining core electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

TOP261YN: This part is the only substitute with Active product status, making it the preferred choice for long-term supply continuity. The TOP261YN operates from the TOPSwitch®-HX series with a fixed 66kHz switching frequency and higher 333W power rating. The increased duty cycle of 78% versus 66.8% reflects different control characteristics. Selection of TOP261YN requires verification that the application's transformer design and feedback network accommodate the fixed frequency operation and higher power capability. This part is suitable for applications where the 290W rating of TOP250YN is marginal or where future design updates are planned.

TOP249YN: This part maintains identical switching frequency range (66kHz ~ 132kHz), duty cycle (66.8%), and control features as the TOP250YN, differing only in power rating (250W versus 290W). The TOP249YN is appropriate for applications where the load power requirement does not exceed 250W, offering the closest functional equivalence to the original design. Highest inventory availability (24,110 pcs) supports immediate procurement.

TOP248YN: This part provides the lowest power rating at 205W with identical frequency and duty cycle characteristics. Selection is limited to applications with power requirements below 205W. This option is suitable only when thermal or design constraints require operation at reduced power levels.

All three substitutes maintain identical package specifications, voltage ratings, isolation topology, and fault protection features, ensuring direct functional replacement within their respective power envelopes.

Frequently Asked Questions (FAQ)

Q: Can TOP250YN be directly replaced with TOP261YN without circuit modifications?

A: Direct pin-for-pin replacement is possible due to identical TO-220-7C packaging. However, the fixed 66kHz frequency of TOP261YN differs from TOP250YN's variable 66kHz to 132kHz range. The transformer design and feedback network may require adjustment to accommodate this frequency difference. Verification of the application's frequency-dependent components is necessary.

Q: What is the primary difference between TOP250YN and TOP249YN?

A: The primary difference is power rating: TOP250YN is rated at 290W while TOP249YN is rated at 250W. Both parts share identical switching frequency range (66kHz ~ 132kHz), duty cycle (66.8%), series designation (TOPSwitch®-GX), and control features. TOP249YN is suitable for applications where the load power does not exceed 250W.

Q: Why is TOP261YN recommended despite being from a different series?

A: TOP261YN is the only substitute with Active product status, ensuring long-term availability and support. While it belongs to the TOPSwitch®-HX series rather than TOPSwitch®-GX, it maintains all critical electrical specifications: 700V breakdown voltage, isolated topology, TO-220-7C package, and comprehensive fault protection. The fixed 66kHz frequency requires design verification but does not preclude substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. TOP261YN, TOP248YN, and TOP249YN are all RoHS compliant with MSL rating of 1 (Unlimited), matching the compliance profile of TOP250YN.

Q: Can TOP248YN be used in applications designed for TOP250YN?

A: TOP248YN can be used only if the application's power requirement does not exceed 205W. The 85W reduction in power rating compared to TOP250YN limits its applicability to lower-power designs. All other electrical and package specifications are compatible.

Q: What mounting considerations apply to these substitute parts?

A: All substitute parts use through-hole mounting in TO-220-7 package with 6 formed leads. No PCB layout modifications are required for package compatibility. Thermal management considerations may vary based on power rating differences; applications operating near the power limit of TOP248YN or TOP249YN may require thermal analysis.

Q: Is frequency control available on all substitute parts?

A: Frequency control is available on TOP250YN, TOP248YN, and TOP249YN (all TOPSwitch®-GX series). TOP261YN (TOPSwitch®-HX series) operates at fixed 66kHz frequency without frequency control capability. This represents a functional difference requiring circuit evaluation.