TOP227Y Equivalent & Substitute Parts Reference

Part Overview

The TOP227Y is an offline switched-mode power supply controller manufactured by Power Integrations, part of the TOPSwitch®-II series. This integrated circuit functions as a converter supporting multiple topologies including Boost, Buck, Flyback, and Forward configurations with 100kHz switching frequency and 150W power capability. The device features internal switching capability, isolated output, and comprehensive fault protection including current limiting and over-temperature shutdown.

The TOP227Y carries an Obsolete product status. Locating equivalent substitute parts is necessary for design continuity, production support, and system maintenance where this component is currently deployed or specified in legacy designs.

Substiute Parts

TOP227Y

Power IntegrationsIn Stock: 1816TOP227Y Datasheet

Current PartRFQ

TOP227YN

Power IntegrationsIn Stock: 10455TOP227YN 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

TOP226YN

Power IntegrationsIn Stock: 9926TOP226YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP227Y are identified within the TOPSwitch®-II series based on strict parameter alignment. The substitution logic is determined by the following critical parameters:

Fixed Parameters (Must Match for Substitution):

• Manufacturer: Power Integrations
• Series: TOPSwitch®-II
• Package / Case: TO-220-3
• Mounting Type: Through Hole
• Voltage - Breakdown: 700V
• Topology: Boost, Buck, Flyback, Forward
• Frequency - Switching: 100kHz
• Duty Cycle: 67%
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Fault Protection: Current Limiting, Over Temperature
• Operating Temperature: -40°C ~ 150°C (TJ)
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Variable Parameter (Differentiates Models):

• Power (Watts): Ranges from 12W to 150W across the series

All substitute parts listed maintain identical electrical and mechanical specifications except for power rating. The TOP227Y at 150W can be substituted with lower-power variants only in applications where the reduced power rating is acceptable. Conversely, higher-power variants cannot substitute for the TOP227Y due to different internal design parameters.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent: TOP227YN is the direct equivalent to TOP227Y. Both devices deliver 150W power output with identical electrical and mechanical specifications. TOP227YN carries RoHS Compliant status compared to the non-compliant TOP227Y, making it suitable for applications subject to RoHS regulations. TOP227YN is classified as "Not For New Designs" but remains available with substantial inventory (10400 units).

Power-Scaled Alternatives: For applications where the full 150W capability is not required, lower-power variants within the TOPSwitch®-II series provide functional equivalence with reduced power ratings:

• TOP226YN (125W): Suitable for designs requiring up to 125W output
• TOP225YN (100W): Suitable for designs requiring up to 100W output
• TOP224YN (75W): Suitable for designs requiring up to 75W output
• TOP223YN (50W): Suitable for designs requiring up to 50W output
• TOP222YN (25W): Suitable for designs requiring up to 25W output
• TOP221YN (12W): Suitable for designs requiring up to 12W output

All substitute parts maintain identical electrical characteristics (700V breakdown voltage, 100kHz switching frequency, 67% duty cycle, isolated output, fault protection features) and mechanical compatibility (TO-220-3 package, through-hole mounting).

Compliance Consideration: All substitute parts listed carry RoHS Compliant status, providing regulatory advantage over the original TOP227Y. Selection should prioritize parts with RoHS Compliant designation for new production or redesign initiatives.

Frequently Asked Questions (FAQ)

Q: Can TOP227YN directly replace TOP227Y in existing designs? A: Yes. TOP227YN is the direct equivalent with identical electrical and mechanical specifications. The primary difference is RoHS Compliant status (TOP227YN) versus non-compliant status (TOP227Y). Packaging differs (Tube versus Bulk), but functional performance is equivalent.

Q: What determines whether a lower-power variant can substitute for TOP227Y? A: Power rating is the only variable parameter among TOPSwitch®-II series devices. Lower-power variants (TOP226YN through TOP221YN) can substitute only if the application's actual power requirement does not exceed the substitute part's rating. All other electrical and mechanical parameters remain identical across the series.

Q: Are all substitute parts compatible with TO-220-3 footprints designed for TOP227Y? A: Yes. All listed substitute parts use TO-220-3 package with through-hole mounting. Physical footprint compatibility is guaranteed. Pin configuration and electrical interface remain consistent across the TOPSwitch®-II series.

Q: Why is TOP227Y marked as Obsolete while substitutes are marked "Not For New Designs"? A: Product status reflects manufacturer lifecycle classification. Obsolete indicates end-of-life with no further production. "Not For New Designs" indicates the part remains available but is not recommended for new development. Both statuses indicate the need for alternative solutions in new applications.

Q: Does RoHS Compliance status affect electrical performance? A: No. RoHS Compliance refers to material composition and environmental compliance, not electrical performance. RoHS Compliant variants (all substitute parts listed) deliver identical electrical specifications to the non-compliant TOP227Y.

Q: What inventory considerations apply when selecting substitutes? A: TOP222YN offers the highest inventory (56400 units), followed by TOP224YN (39300 units). TOP227YN, the direct equivalent, maintains 10400 units. Inventory levels should be evaluated against production volume and supply chain requirements.

Q: Can TOP227Y be used in applications designed for lower-power variants? A: Yes. The 150W TOP227Y can operate in applications designed for lower-power variants, provided the circuit design accommodates the higher power capability. However, this represents over-specification and is not an efficient substitution strategy.