TNY255P Equivalent & Substitute Parts

Part Overview

The TNY255P is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications using flyback topology. This device integrates an internal power switch with integrated protection features, operating at 130 kHz switching frequency with 6.5 W output power capability.

The TNY255P is classified as Obsolete. Locating equivalent or substitute components is necessary for ongoing production support, design updates, or inventory replenishment when original stock becomes unavailable.

Substiute Parts

TNY255P

Power IntegrationsIn Stock: 2378TNY255P Datasheet

Current PartRFQ

TNY255PN

Power IntegrationsIn Stock: 42133TNY255PN Datasheet

DirectRFQ

NCP1013AP100G

onsemiIn Stock: 4943NCP1013AP100G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TNY255P are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Primary Compatibility Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch: Integrated power switch required
• Voltage - Breakdown: 700V minimum rating
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Package / Case: 8-DIP through-hole mounting
• Mounting Type: Through Hole

Substitutes are grouped into two categories:

1. Direct Manufacturer Substitute (TNY255PN): Same manufacturer (Power Integrations), identical electrical specifications, same package, different product status and RoHS compliance.

2. Similar Manufacturer Substitute (NCP1013AP100G): Different manufacturer (onsemi), same topology and isolation, compatible package footprint, variations in switching frequency, power rating, and fault protection features.

Parameter Comparison

Engineering Selection Recommendations

TNY255PN (Direct Substitute): TNY255PN is the direct equivalent from Power Integrations with identical electrical and mechanical specifications. This part is classified as "Not For New Designs" but remains functionally equivalent to TNY255P. The primary distinction is RoHS compliance status: TNY255PN is RoHS Compliant with MSL 1 (Unlimited), whereas TNY255P is RoHS non-compliant. Selection of TNY255PN is appropriate for applications requiring RoHS compliance or when TNY255P inventory is exhausted.

NCP1013AP100G (Similar Substitute): NCP1013AP100G from onsemi provides functional substitution with the following considerations:

• Switching frequency is reduced from 130 kHz to 100 kHz, affecting transformer design and EMI characteristics
• Power rating is increased to 19 W, providing design margin beyond TNY255P specifications
• Fault protection includes Over Load and Over Voltage protection in addition to Over Temperature, offering enhanced protection
• Voltage supply range is specified (8.5V ~ 10V) versus unspecified for TNY255P
• Package footprint is compatible (8-DIP through-hole), though pin count differs (7 leads vs. standard 8-pin configuration)
• RoHS3 Compliant status meets current regulatory requirements

Selection of NCP1013AP100G requires circuit redesign to accommodate the 30 kHz frequency reduction and verification of the 7-lead pin configuration against the original 8-pin layout.

Frequently Asked Questions (FAQ)

Q: Can TNY255PN be used as a direct replacement for TNY255P without circuit modification?

A: Yes. TNY255PN shares identical electrical specifications, switching frequency (130 kHz), power rating (6.5 W), duty cycle (67%), and package footprint (8-DIP through-hole). No circuit redesign is required. The primary difference is RoHS compliance status.

Q: What are the implications of using NCP1013AP100G instead of TNY255P?

A: NCP1013AP100G operates at 100 kHz versus 130 kHz, requiring transformer and filter redesign. The higher power rating (19 W) and expanded fault protection (Over Load, Over Voltage) may require circuit validation. The 7-lead configuration must be verified against the original 8-pin layout for PCB compatibility.

Q: Is TNY255P still available for new designs?

A: TNY255P is classified as Obsolete. For new designs, TNY255PN (Not For New Designs) or alternative topologies should be evaluated. Current Power Integrations TinySwitch® series offerings provide updated alternatives.

Q: What is the difference between TNY255P and TNY255PN packaging?

A: TNY255P packaging is not specified in available data. TNY255PN is supplied in Tube packaging with MSL 1 (Unlimited) moisture sensitivity rating. Both use 8-DIP (0.300", 7.62mm) through-hole package case.

Q: Are there RoHS compliance considerations for TNY255P substitution?

A: TNY255P is RoHS non-compliant. TNY255PN is RoHS Compliant, and NCP1013AP100G is ROHS3 Compliant. Applications subject to RoHS regulations should transition to TNY255PN or NCP1013AP100G.

Q: How does the 67% duty cycle affect substitution decisions?

A: All three parts (TNY255P, TNY255PN, NCP1013AP100G) share the same 67% duty cycle specification. This parameter does not differentiate substitution eligibility.

Q: What fault protection differences exist between these parts?

A: TNY255P and TNY255PN provide Current Limiting and Over Temperature protection. NCP1013AP100G adds Over Load and Over Voltage protection, offering enhanced fault coverage. Circuit design must account for these protection feature differences.

Q: Is the 700V breakdown voltage specification identical across all three parts?

A: Yes. All three parts (TNY255P, TNY255PN, NCP1013AP100G) are rated for 700V breakdown voltage, ensuring compatibility in high-voltage offline converter applications.