TOP226Y Equivalent & Substitute Parts Reference

Part Overview

The TOP226Y is an offline switching converter IC manufactured by Power Integrations, part of the TOPSwitch®-II series. This device integrates a high-voltage power switch with control circuitry for isolated power supply applications supporting Boost, Buck, Flyback, and Forward topologies at 100kHz switching frequency with 125W power rating.

The TOP226Y carries an Obsolete product status. Locating equivalent substitute parts is necessary for design continuity, production support, and long-term supply chain management. Direct manufacturer alternatives and parametric equivalents within the TOPSwitch®-II family provide functional compatibility for applications requiring offline switching converter functionality.

Substiute Parts

TOP226Y

Power IntegrationsIn Stock: 3065TOP226Y Datasheet

Current PartRFQ

TOP226YN

Power IntegrationsIn Stock: 9926TOP226YN Datasheet

DirectRFQ

TOP221YN

Power IntegrationsIn Stock: 5612TOP221YN Datasheet

Parametric EquivalentRFQ

TOP222YN

Power IntegrationsIn Stock: 56502TOP222YN Datasheet

Parametric EquivalentRFQ

TOP223YN

Power IntegrationsIn Stock: 25262TOP223YN Datasheet

Parametric EquivalentRFQ

TOP224YN

Power IntegrationsIn Stock: 39324TOP224YN Datasheet

Parametric EquivalentRFQ

TOP225YN

Power IntegrationsIn Stock: 8544TOP225YN Datasheet

Parametric EquivalentRFQ

TOP227YN

Power IntegrationsIn Stock: 10455TOP227YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP226Y are classified into two categories based on substitution criteria:

Direct Manufacturer Substitute (Pin-Compatible, Packaging Variant): TOP226YN shares identical electrical specifications, package type (TO-220-3), mounting method (Through Hole), and all core functional parameters with TOP226Y. The primary difference is packaging format (Tube vs. bulk) and improved RoHS compliance status. This part provides direct functional replacement.

Parametric Equivalents (Same Series, Different Power Ratings): TOP221YN, TOP222YN, TOP223YN, TOP224YN, TOP225YN, and TOP227YN are members of the TOPSwitch®-II family with identical electrical characteristics except for power rating. Substitution among these parts is determined by the following parameters:

• Voltage - Breakdown: 700V (all parts)
• Frequency - Switching: 100kHz (all parts)
• Duty Cycle: 67% (all parts)
• Operating Temperature: -40°C to 150°C (all parts)
• Package / Case: TO-220-3 (all parts)
• Mounting Type: Through Hole (all parts)
• Output Isolation: Isolated (all parts)
• Fault Protection: Current Limiting, Over Temperature (all parts)

Variable Parameter (Power Rating): Power (Watts): 12W (TOP221YN), 25W (TOP222YN), 50W (TOP223YN), 75W (TOP224YN), 100W (TOP225YN), 125W (TOP226Y/TOP226YN), 150W (TOP227YN)

Substitution among parametric equivalents is valid only when the application power requirement does not exceed the substitute part's power rating.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Power Rating): TOP226YN is the primary substitute for TOP226Y. Both parts deliver 125W power output with identical electrical and mechanical specifications. TOP226YN offers improved RoHS compliance status and maintains "Not For New Designs" status consistent with the TOPSwitch®-II family lifecycle. This part is suitable for legacy system support and production continuity.

For Parametric Substitution (Different Power Ratings): Selection among TOP221YN through TOP227YN depends on application power requirements:

• Applications requiring ≤12W: TOP221YN
• Applications requiring ≤25W: TOP222YN
• Applications requiring ≤50W: TOP223YN
• Applications requiring ≤75W: TOP224YN
• Applications requiring ≤100W: TOP225YN
• Applications requiring ≤125W: TOP226YN (direct equivalent)
• Applications requiring ≤150W: TOP227YN

All substitute parts maintain identical voltage breakdown (700V), switching frequency (100kHz), duty cycle (67%), operating temperature range (-40°C to 150°C), package type (TO-220-3), and fault protection features. Substitution is valid only when the selected part's power rating meets or exceeds the application requirement.

Compliance Considerations: TOP226Y is RoHS non-compliant. All substitute parts (TOP226YN, TOP221YN through TOP227YN) are RoHS compliant. For applications subject to RoHS regulations, any substitute part provides compliance improvement. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can TOP226YN directly replace TOP226Y in existing designs? A: Yes. TOP226YN is the direct manufacturer substitute with identical electrical specifications, package type (TO-220-3), and power rating (125W). The primary differences are packaging format (Tube) and RoHS compliance status. No circuit modifications are required.

Q: What is the difference between TOP226Y and TOP226YN? A: Both parts share identical electrical and mechanical specifications. TOP226Y is packaged in bulk format and is RoHS non-compliant. TOP226YN is supplied in Tube packaging and is RoHS compliant. TOP226Y carries Obsolete status while TOP226YN carries Not For New Designs status.

Q: Can I substitute TOP225YN (100W) for TOP226Y (125W)? A: No. TOP225YN has a lower power rating (100W) than TOP226Y (125W). Substitution with lower-rated parts is not valid. However, TOP227YN (150W) can substitute for TOP226Y if the application power requirement does not exceed 125W.

Q: Are all TOPSwitch®-II parts pin-compatible? A: All substitute parts share the same TO-220-3 package and Through Hole mounting type. However, pin compatibility is not guaranteed across different power ratings. Verify pinout compatibility with the specific datasheet before substitution.

Q: What is the significance of "Not For New Designs" status? A: This status indicates the part is in end-of-life phase. While suitable for legacy system support and production continuity, these parts should not be selected for new product development. For new designs, contact Power Integrations for current-generation alternatives.

Q: Can I use a higher-power substitute (TOP227YN at 150W) in place of TOP226Y (125W)? A: Yes, if the application power requirement does not exceed 125W. TOP227YN maintains all other electrical specifications identical to TOP226Y. The higher power rating provides design margin but does not affect circuit operation at lower power levels.

Q: What are the key parameters that determine substitution validity? A: Substitution is valid when the following parameters match or exceed the original part: Voltage Breakdown (700V), Switching Frequency (100kHz), Duty Cycle (67%), Operating Temperature Range (-40°C to 150°C), Package Type (TO-220-3), and Power Rating (equal to or greater than application requirement).

Q: Are there any compliance differences between substitute parts? A: All substitute parts are RoHS compliant, REACH Unaffected, and EAR99 classified. TOP226Y is RoHS non-compliant. For applications requiring RoHS compliance, any substitute part (TOP226YN, TOP221YN through TOP227YN) provides compliance improvement.

Q: What inventory levels are available for substitute parts? A: Current inventory includes TOP226YN (9,842 pcs), TOP222YN (56,400 pcs), TOP223YN (25,200 pcs), TOP224YN (39,300 pcs), TOP225YN (8,475 pcs), and TOP227YN (10,400 pcs). Inventory levels are subject to change. Verify current availability with supplier.