TOP242YN Equivalent & Substitute Parts Reference

Part Overview

The TOP242YN is an offline switched-mode power supply controller manufactured by Power Integrations, operating on flyback topology with isolated output. This device integrates an internal power switch rated for 700V breakdown voltage and delivers 22W output power across a switching frequency range of 66kHz to 132kHz. The TOP242YN is packaged in TO-220-7C through-hole configuration and is compliant with RoHS and REACH regulations.

The TOP242YN carries a product status designation of "Not For New Designs," indicating that while the part remains available in inventory (3633 pieces), Power Integrations recommends evaluating alternative solutions for new development projects. Substitute parts within the TOPSwitch®-GX series provide equivalent electrical and mechanical compatibility while offering higher power ratings for applications requiring increased output capacity.

Substiute Parts

TOP242YN

Power IntegrationsIn Stock: 3740TOP242YN Datasheet

Current PartRFQ

TOP243YN

Power IntegrationsIn Stock: 57383TOP243YN Datasheet

Parametric EquivalentRFQ

TOP244YN

Power IntegrationsIn Stock: 3712TOP244YN Datasheet

Parametric EquivalentRFQ

TOP245YN

Power IntegrationsIn Stock: 45423TOP245YN Datasheet

Parametric EquivalentRFQ

TOP246YN

Power IntegrationsIn Stock: 22608TOP246YN Datasheet

Parametric EquivalentRFQ

TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP242YN are selected from the TOPSwitch®-GX family based on strict electrical and mechanical compatibility criteria. All substitute parts maintain identical specifications across the following parameters:

Fixed Compatibility Parameters:

• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Frequency - Switching: 66kHz ~ 132kHz
• Duty Cycle: 66.5%
• Operating Temperature: -40°C ~ 150°C (TJ)
• Package / Case: TO-220-7 Formed Leads, 6 Leads
• Mounting Type: Through Hole
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Series: TOPSwitch®-GX
• RoHS Status: RoHS Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Substitution Basis):

• Power (Watts): Ranges from 22W to 165W across the substitute family

Substitution is permissible when the application power requirement does not exceed the rated power output of the selected substitute part. All substitute parts share identical electrical characteristics, pin configuration, and thermal operating range, enabling direct mechanical and electrical interchange within the specified power envelope.

Parameter Comparison

Engineering Selection Recommendations

Selection of substitute parts for the TOP242YN must be based on application power requirements and compliance requirements. All substitute parts carry identical RoHS Compliant and REACH Unaffected certifications, ensuring regulatory equivalence across the TOPSwitch®-GX family.

Selection Criteria:

1. Power Rating Match: Select a substitute part with power rating equal to or greater than the application requirement. The TOP242YN (22W) can be substituted with TOP243YN (45W), TOP244YN (65W), TOP245YN (85W), TOP246YN (125W), or TOP247YN (165W) when higher power capacity is required.

2. Product Status Consideration: All parts in this family carry "Not For New Designs" status. For new development projects, evaluation of current-generation Power Integrations controllers is recommended through official product documentation.

3. Inventory Availability: TOP243YN and TOP245YN demonstrate highest inventory levels (57300 and 45400 pieces respectively), supporting supply chain continuity for high-volume applications.

4. Thermal and Electrical Equivalence: All substitute parts maintain identical operating temperature range (-40°C to 150°C), breakdown voltage (700V), and switching frequency characteristics (66kHz to 132kHz), ensuring thermal management and circuit design compatibility.

Frequently Asked Questions (FAQ)

Q: Can TOP242YN be directly replaced with TOP243YN in an existing design?

A: Direct replacement is mechanically and electrically feasible. Both parts share identical TO-220-7 package configuration, pin assignment, and electrical characteristics. The TOP243YN provides 45W output capacity compared to TOP242YN's 22W rating. Verify that the application power requirement does not exceed 45W and that thermal management design accommodates the higher power device.

Q: What is the primary difference between TOP242YN and other parts in the substitute list?

A: The sole variable parameter across all substitute parts is power output rating. TOP242YN delivers 22W, while substitute parts range from 45W (TOP243YN) to 165W (TOP247YN). All other electrical specifications, including topology, voltage rating, switching frequency, operating temperature, and package configuration, remain identical.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All parts listed—TOP242YN, TOP243YN, TOP244YN, TOP245YN, TOP246YN, and TOP247YN—carry RoHS Compliant and REACH Unaffected certifications. Moisture Sensitivity Level (MSL) is rated as 1 (Unlimited) across all parts.

Q: Can a lower-power substitute (e.g., TOP242YN) replace a higher-power part (e.g., TOP245YN)?

A: No. Substitution is permissible only when the selected part's power rating meets or exceeds the application requirement. Using a lower-rated device in a higher-power application results in thermal stress, reduced efficiency, and potential device failure.

Q: What is the significance of "Not For New Designs" product status?

A: This designation indicates that while the part remains in production and available in inventory, Power Integrations recommends that new development projects evaluate alternative solutions. Existing designs using these parts may continue production without restriction.

Q: Are pin configurations identical across all substitute parts?

A: Yes. All parts use TO-220-7 Formed Leads package with 6 leads. Pin configuration and electrical function remain constant across the entire substitute family, enabling direct mechanical interchange.

Q: What inventory levels should be considered for supply chain planning?

A: TOP243YN (57300 pieces) and TOP245YN (45400 pieces) offer the highest inventory availability. TOP247YN (34242 pieces) and TOP246YN (22534 pieces) provide moderate stock levels. TOP242YN (3633 pieces) and TOP244YN (3675 pieces) show lower availability and may require longer lead times for high-volume orders.