TNY253P Equivalent & Substitute Parts

Part Overview

The TNY253P is an offline switch flyback converter IC manufactured by Power Integrations, part of the TinySwitch® series. This 8-DIP through-hole component integrates a 700V breakdown voltage switch with internal current limiting and over-temperature protection, designed for isolated flyback topology power conversion applications at 44kHz switching frequency with 2W output power capability.

The TNY253P carries an Obsolete product status. Locating equivalent substitute parts is necessary for ongoing production support, maintenance applications, and component procurement where original stock availability becomes constrained.

Substiute Parts

TNY253P

Power IntegrationsIn Stock: 3376TNY253P Datasheet

Current PartRFQ

TNY253PN

Power IntegrationsIn Stock: 30947TNY253PN Datasheet

Parametric EquivalentRFQ

TNY254PN

Power IntegrationsIn Stock: 6272TNY254PN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TNY253P is determined by strict parameter matching across the following critical criteria:

Mandatory Matching Parameters:

• Manufacturer: Power Integrations
• Series: TinySwitch®
• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Frequency - Switching: 44kHz
• Duty Cycle: 68%
• Fault Protection: Current Limiting, Over Temperature
• Control Features: EN
• Operating Temperature: -40°C ~ 150°C (TJ)
• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Internal Switch(s): Yes

Variable Parameters (Allowable Differences):

• Power (Watts): Substitute parts may have equal or higher power rating
• Product Status: Obsolete parts may be substituted with Not For New Designs status parts
• RoHS Status: Compliant substitutes are acceptable for non-compliant originals
• Packaging: Different packaging formats (Tube vs. standard) are acceptable if electrical parameters match

The TNY253PN and TNY254PN meet these substitution criteria with the following distinctions: TNY253PN maintains identical 2W power rating with improved RoHS compliance; TNY254PN provides 4W power capability while maintaining all other electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

TNY253PN Selection Criteria: TNY253PN serves as the direct equivalent to TNY253P with identical electrical specifications and power rating. The primary distinction is RoHS compliance status. TNY253PN is suitable for applications requiring RoHS-compliant components while maintaining the original 2W power specification. Product status designation as "Not For New Designs" indicates this part remains available for legacy system support and maintenance applications.

TNY254PN Selection Criteria: TNY254PN provides substitution capability with increased power handling at 4W output. This part maintains all electrical parameters including 700V breakdown voltage, 44kHz switching frequency, 68% duty cycle, and identical fault protection mechanisms. TNY254PN is applicable in applications where the original 2W specification can accommodate higher power capability without circuit redesign. RoHS compliance and "Not For New Designs" status align with TNY253PN characteristics.

Compliance Considerations: Both substitute parts carry RoHS Compliant status, addressing regulatory requirements that may not apply to the original TNY253P. REACH Unaffected status is consistent across all three parts. Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) is maintained across all variants, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can TNY253PN directly replace TNY253P in existing circuit boards? A: Yes. TNY253PN maintains identical electrical parameters, package dimensions (8-DIP 0.300"), and through-hole mounting configuration. No circuit modifications are required for direct substitution.

Q: What is the primary difference between TNY253PN and TNY254PN? A: The power rating differs: TNY253PN provides 2W output power identical to TNY253P, while TNY254PN provides 4W output power. All other electrical parameters including voltage breakdown, switching frequency, duty cycle, and protection features remain identical.

Q: Is TNY254PN suitable for applications originally designed for TNY253P? A: TNY254PN can substitute TNY253P in applications where the circuit design accommodates higher power capability. The increased 4W rating does not create incompatibility with 2W-rated designs; however, thermal and PCB layout considerations should be evaluated for the specific application.

Q: What does "Not For New Designs" product status mean? A: This designation indicates the part remains available for production and support of existing products but is not recommended for new product development. Both TNY253PN and TNY254PN carry this status, making them suitable for legacy system maintenance and ongoing production of established designs.

Q: Are there packaging differences between TNY253P and the substitute parts? A: TNY253P is supplied in standard packaging, while TNY253PN and TNY254PN are supplied in Tube packaging. Both packaging formats contain identical components with the same electrical specifications. Tube packaging is standard for production quantities and does not affect component performance or compatibility.

Q: Do the substitute parts require different PCB layout or thermal management? A: TNY253PN requires no layout changes from TNY253P due to identical specifications. TNY254PN, with 4W capability, may benefit from enhanced thermal management in high-ambient-temperature applications, though the identical operating temperature range (-40°C ~ 150°C TJ) and package dimensions maintain mechanical compatibility.

Q: What is the inventory status of these substitute parts? A: TNY253PN has 30,900 pieces in stock. TNY254PN has 6,223 pieces in stock. Both parts maintain active inventory availability for component procurement.