TOP225YN Equivalent & Substitute Parts Reference

Part Overview

The TOP225YN 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 multiple topologies including Boost, Buck, Flyback, and Forward configurations. The TOP225YN is classified as Not For New Designs, indicating it is a legacy product. For new design implementations or when TOP225YN availability becomes constrained, equivalent and substitute parts from the TOPSwitch®-II series provide functional alternatives with varying power output ratings and compatible electrical characteristics.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Part Number	TOP225YN
Series	TOPSwitch®-II
Category	Power Management (PMIC)
Package Type	TO-220-3
Mounting Type	Through Hole
Voltage - Breakdown	700V
Switching Frequency	100kHz
Power Rating	100 W
Duty Cycle	67%
Topology Support	Boost, Buck, Flyback, Forward
Output Isolation	Isolated
Fault Protection	Current Limiting, Over Temperature
Operating Temperature Range	-40°C ~ 150°C (TJ)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the TOP225YN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Manufacturer: Power Integrations
Series: TOPSwitch®-II
Package Type: TO-220-3
Voltage - Breakdown: 700V
Switching Frequency: 100kHz
Duty Cycle: 67%
Topology Support: Boost, Buck, Flyback, Forward
Output Isolation: Isolated
Fault Protection: Current Limiting, Over Temperature
Operating Temperature Range: -40°C ~ 150°C (TJ)
Mounting Type: Through Hole

Variable Parameter (Power Rating): The power output rating is the distinguishing characteristic among TOPSwitch®-II series members. The TOP225YN operates at 100 W. Substitute parts within the same series maintain identical electrical specifications and package configuration but differ in power handling capacity. Selection of a substitute part depends on the specific power requirement of the target application.

Substitute Parts (TOPSwitch®-II Series, TO-220-3 Package):

TOP221YN: 12 W
TOP222YN: 25 W
TOP223YN: 50 W
TOP224YN: 75 W
TOP226YN: 125 W
TOP227YN: 150 W

All listed substitutes maintain identical electrical characteristics, package configuration, and compliance certifications as the TOP225YN.

Parameter Comparison

Part Number	Series	Package	Power (W)	Voltage Breakdown (V)	Frequency (kHz)	Duty Cycle (%)	Topology	Fault Protection	Temp Range (°C)	Inventory (Pcs)
TOP225YN	TOPSwitch®-II	TO-220-3	100	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	8,475
TOP221YN	TOPSwitch®-II	TO-220-3	12	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	5,525
TOP222YN	TOPSwitch®-II	TO-220-3	25	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	56,400
TOP223YN	TOPSwitch®-II	TO-220-3	50	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	25,200
TOP224YN	TOPSwitch®-II	TO-220-3	75	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	39,300
TOP226YN	TOPSwitch®-II	TO-220-3	125	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	9,842
TOP227YN	TOPSwitch®-II	TO-220-3	150	700	100	67	Boost, Buck, Flyback, Forward	Current Limiting, Over Temperature	-40 ~ 150	10,400

Engineering Selection Recommendations

Compliance and Certification Status: All substitute parts listed maintain identical RoHS compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited) classification as the TOP225YN. All parts are classified as Not For New Designs, indicating legacy product status across the entire TOPSwitch®-II series.

Selection Basis: Substitute part selection is determined exclusively by application power requirement. The electrical specifications, package configuration, thermal characteristics, and protection features remain constant across all listed alternatives. The choice between TOP221YN through TOP227YN depends on whether the target application requires power output below, equal to, or above the 100 W rating of the TOP225YN.

Power Rating Considerations:

For applications requiring less than 100 W output: Select TOP221YN (12 W), TOP222YN (25 W), TOP223YN (50 W), or TOP224YN (75 W)
For applications requiring 100 W output: TOP225YN remains the direct equivalent
For applications requiring more than 100 W output: Select TOP226YN (125 W) or TOP227YN (150 W)

Inventory Availability: Current stock levels vary across the series. TOP222YN maintains the highest inventory at 56,400 units, while TOP221YN and TOP226YN show lower availability at 5,525 and 9,842 units respectively.

Frequently Asked Questions (FAQ)

Q: Can TOP225YN be directly replaced with any other part in the TOPSwitch®-II series?

A: Direct replacement is possible only with parts maintaining identical power rating. For functional substitution with different power requirements, circuit design modifications may be necessary to accommodate the different power handling characteristics of alternative models.

Q: What is the primary difference between TOP225YN and other TOPSwitch®-II series members?

A: The power output rating is the primary distinguishing parameter. All members of the TOPSwitch®-II series in TO-220-3 package share identical electrical specifications including 700V breakdown voltage, 100kHz switching frequency, 67% duty cycle, and support for Boost, Buck, Flyback, and Forward topologies.

Q: Are all substitute parts compatible with the same PCB layout as TOP225YN?

A: Yes. All substitute parts use the TO-220-3 package with identical pin configuration and through-hole mounting specifications. PCB layout compatibility is maintained across all listed alternatives.

Q: What protection features are included in TOP225YN and its substitutes?

A: All parts include Current Limiting and Over Temperature fault protection. The TOP245YN substitute from the TOPSwitch®-GX series adds Over Voltage protection but operates at different electrical specifications and package configuration.

Q: Is TOP225YN suitable for new design implementations?

A: No. TOP225YN is classified as Not For New Designs. All listed TOPSwitch®-II series substitutes share this classification. New designs should evaluate current-generation Power Integrations converter ICs.

Q: What is the operating temperature range for TOP225YN?

A: The operating temperature range is -40°C to 150°C (junction temperature). This specification is identical across all TOPSwitch®-II series substitutes listed.

Q: Can TOP245YN be used as a substitute for TOP225YN?

A: TOP245YN belongs to the TOPSwitch®-GX series and operates at different electrical specifications. It supports only Flyback topology, operates at 66kHz to 132kHz switching frequency, and uses TO-220-7C package configuration. TOP245YN is not a direct substitute for TOP225YN.

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