TOP100YN Equivalent & Substitute Parts Reference

Part Overview

The TOP100YN is an offline switching converter IC manufactured by Power Integrations, designed for multiple topologies including Boost, Buck, Flyback, and Forward configurations. This component operates at 100kHz switching frequency with 30W power capability and integrated current limiting and over-temperature protection. The TOP100YN carries an Obsolete product status, making identification of suitable alternatives essential for ongoing design support and production continuity. The part is housed in a TO-220-3 through-hole package with unlimited moisture sensitivity rating.

Substiute Parts

TOP100YN

Power IntegrationsIn Stock: 16438TOP100YN Datasheet

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TOP242YN

Power IntegrationsIn Stock: 3740TOP242YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP100YN is constrained by the following critical parameters that must align between the main part and any alternative:

Topology Compatibility: The TOP100YN supports multiple topologies (Boost, Buck, Flyback, Forward). Substitute parts must support at least the Flyback topology, as this represents the most common application for this device class.

Package and Mounting: The original TO-220-3 through-hole package defines the physical footprint. Substitute parts must maintain through-hole mounting compatibility to ensure PCB layout compatibility without redesign.

Voltage Rating: The 350V breakdown voltage establishes the maximum input voltage capability. Substitute parts with higher voltage ratings (such as 700V) remain compatible for applications operating below the original specification.

Power Handling: The 30W power rating defines thermal and current handling capacity. Substitute parts with equal or higher power ratings maintain functional compatibility.

Isolation and Protection Features: Output isolation and integrated fault protection (current limiting, over-temperature) are core functional requirements. Substitute parts must retain these characteristics.

Operating Temperature Range: The -40°C to 150°C junction temperature range must be maintained or exceeded in substitute parts.

The TOP242YN is identified as a substitute based on shared isolation architecture, integrated protection features, through-hole mounting, and compatible operating temperature range, despite differences in topology focus, package pin count, and voltage rating.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The TOP100YN is classified as Obsolete, while the TOP242YN is classified as Not For New Designs. For applications requiring component replacement or production continuation, the TOP242YN represents a more recent alternative within the Power Integrations TOPSwitch family, though both parts carry legacy status.

Compliance and Certification: The TOP242YN carries RoHS Compliant status, whereas RoHS compliance is not specified for the TOP100YN. Both parts are REACH Unaffected and carry EAR99 ECCN classification. For applications subject to RoHS requirements, the TOP242YN provides documented compliance.

Package Transition: Substitution requires PCB layout modification due to the change from TO-220-3 (3 leads) to TO-220-7 (7 leads). Pin function mapping and circuit topology adjustments are necessary. The through-hole mounting method remains consistent, reducing mechanical redesign scope.

Power Rating Differential: The TOP242YN is rated at 22W compared to the TOP100YN's 30W. Applications operating near the 30W limit require thermal analysis to confirm the TOP242YN's adequacy. Lower-power applications (under 22W) present no constraint.

Protection Feature Enhancement: The TOP242YN includes integrated over-voltage protection in addition to current limiting and over-temperature protection. This represents a functional enhancement for applications requiring comprehensive fault coverage.

Frequency Compatibility: The TOP242YN's switching frequency range (66kHz to 132kHz) encompasses the TOP100YN's fixed 100kHz operation, supporting equivalent EMI and filtering characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TOP242YN directly replace the TOP100YN without PCB modification?

A: No. The TOP100YN uses a TO-220-3 package (3 leads), while the TOP242YN uses a TO-220-7 package (7 leads). PCB layout changes are required to accommodate the additional leads and modified pin assignments. Pin function mapping must be verified against both datasheets before implementation.

Q: What is the primary reason the TOP100YN is obsolete?

A: The TOP100YN is classified as Obsolete by Power Integrations. The TOP242YN, while classified as Not For New Designs, represents a more recent product within the same manufacturer's TOPSwitch family and is recommended for replacement applications.

Q: Is the TOP242YN suitable for applications requiring 30W output?

A: The TOP242YN is rated at 22W, which is 8W below the TOP100YN's 30W specification. Suitability depends on the actual power requirements of the application. Applications operating at or near 30W require thermal analysis and may require circuit redesign to operate within the TOP242YN's power envelope.

Q: What additional protection does the TOP242YN provide compared to the TOP100YN?

A: The TOP242YN includes integrated over-voltage protection in addition to current limiting and over-temperature protection. The TOP100YN provides current limiting and over-temperature protection only. This additional protection feature enhances fault tolerance in the TOP242YN.

Q: Are both parts suitable for new designs?

A: No. Both the TOP100YN (Obsolete) and TOP242YN (Not For New Designs) carry legacy product status. For new designs, Power Integrations recommends consulting current product families within the TOPSwitch series. These parts are suitable only for replacement and production continuation of existing designs.

Q: How do the switching frequencies compare?

A: The TOP100YN operates at a fixed 100kHz switching frequency. The TOP242YN operates across a range of 66kHz to 132kHz, which includes the TOP100YN's frequency. This compatibility supports equivalent EMI filtering and transformer design in most applications.

Q: What is the impact of the voltage rating difference (350V vs. 700V)?

A: The TOP242YN's 700V breakdown voltage is higher than the TOP100YN's 350V rating. This means the TOP242YN can handle higher input voltages. For applications operating below 350V input, both parts are functionally equivalent in this parameter. The higher rating does not create incompatibility.

Q: Does the TOP242YN meet RoHS compliance requirements?

A: Yes. The TOP242YN is RoHS Compliant. The TOP100YN's RoHS status is not specified in available documentation. For applications subject to RoHS requirements, the TOP242YN provides documented compliance.

Q: What is the inventory status of these parts?

A: The TOP100YN has 16,400 pieces in stock (New Original). The TOP242YN has 3,633 pieces in stock (New Original). Both parts are available through current inventory channels, though the TOP100YN has higher stock levels.