TOP248YN Equivalent & Substitute Parts

Part Overview

The TOP248YN is an offline flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology applications, operating at 66kHz to 132kHz switching frequency with 205W power capability. The TOP248YN carries a "Not For New Designs" product status, making identification of equivalent substitute parts essential for ongoing production support and design continuity.

Substiute Parts

TOP248YN

Power IntegrationsIn Stock: 5498TOP248YN Datasheet

Current PartRFQ

TOP259YN

Power IntegrationsIn Stock: 2323TOP259YN Datasheet

SimilarRFQ

TOP249YN

Power IntegrationsIn Stock: 24211TOP249YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TOP248YN are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

Primary Compatibility Criteria:

• Package / Case: TO-220-7 Formed Leads, 6 Leads (identical physical footprint)
• Supplier Device Package: TO-220-7C (identical mounting interface)
• Topology: Flyback (identical circuit topology)
• Voltage - Breakdown: 700V (identical voltage rating)
• Output Isolation: Isolated (identical isolation requirement)
• Internal Switch(s): Yes (identical internal architecture)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage (identical protection features)
• Operating Temperature: -40°C ~ 150°C (TJ) (identical thermal range)
• Mounting Type: Through Hole (identical assembly method)

Secondary Compatibility Criteria:

• Frequency - Switching: 66kHz minimum overlap required
• Power (Watts): Equal or greater capacity acceptable
• Duty Cycle: Operational range compatibility
• Control Features: Frequency Control capability preferred

Substitutes are grouped into two categories: Parametric Equivalents (matching all primary criteria with enhanced power ratings) and Similar Alternatives (matching all primary criteria with different series designation and control characteristics).

Parameter Comparison

Engineering Selection Recommendations

TOP249YN - Parametric Equivalent

The TOP249YN is a direct parametric equivalent within the TOPSwitch®-GX series. It maintains identical electrical specifications, package configuration, and control architecture as the TOP248YN. The primary distinction is increased power rating (250W versus 205W), providing enhanced capacity for the same footprint and thermal envelope. Both devices carry "Not For New Designs" status, indicating equivalent lifecycle positioning. Selection of TOP249YN is appropriate for applications requiring higher power headroom while maintaining design continuity with existing TOP248YN implementations.

TOP259YN - Series Alternative

The TOP259YN represents a substitute from the TOPSwitch®-HX series with active product status. This device maintains identical package, voltage rating, isolation, and protection features. Key differences include fixed 66kHz switching frequency (versus 66kHz-132kHz range), 78% duty cycle (versus 66.8%), 238W power rating, and absence of frequency control feature. The TOP259YN is suitable for applications where fixed-frequency operation is acceptable and active product support is required. The higher duty cycle and fixed frequency may require transformer design adjustments compared to TOP248YN implementations.

Compliance and Certification

All three devices (TOP248YN, TOP249YN, TOP259YN) are RoHS Compliant, REACH Unaffected, and carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Moisture sensitivity level is uniform at MSL 1 (Unlimited) across all variants.

Frequently Asked Questions (FAQ)

Q: Can TOP249YN directly replace TOP248YN in existing designs?

A: Yes. The TOP249YN is a parametric equivalent with identical package (TO-220-7C), topology (Flyback), voltage rating (700V), frequency range (66kHz-132kHz), duty cycle (66.8%), control features (Frequency Control), and protection mechanisms. The increased power rating (250W versus 205W) does not require circuit modifications for applications originally designed for 205W operation.

Q: What are the key differences between TOP249YN and TOP259YN?

A: Both devices share identical packaging and voltage specifications. TOP249YN belongs to the TOPSwitch®-GX series with "Not For New Designs" status, while TOP259YN is from the active TOPSwitch®-HX series. TOP249YN offers variable frequency control (66kHz-132kHz) and 66.8% duty cycle, whereas TOP259YN operates at fixed 66kHz with 78% duty cycle. TOP259YN provides higher power (238W) but lacks frequency control capability.

Q: Is TOP259YN suitable for designs currently using TOP248YN?

A: TOP259YN is mechanically and electrically compatible (same package, voltage, isolation, protection). However, the fixed 66kHz frequency and 78% duty cycle differ from TOP248YN's variable frequency range and 66.8% duty cycle. Transformer design and feedback network adjustments may be required. TOP259YN is appropriate when fixed-frequency operation meets application requirements and active product support is prioritized.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the device is in mature/legacy phase but remains available for existing production and support. TOP248YN and TOP249YN carry this status. TOP259YN, with "Active" status, represents current-generation technology with ongoing manufacturer support and development.

Q: Are all three devices pin-compatible?

A: Yes. All three devices use TO-220-7 Formed Leads, 6 Leads package configuration (TO-220-7C supplier package), ensuring identical pin count and physical footprint for through-hole mounting.

Q: Do these devices require different PCB layouts?

A: No. The identical TO-220-7C package ensures PCB footprint compatibility. However, transformer design and feedback network component values may require adjustment when switching between devices with different frequency ranges or duty cycles.

Q: What inventory considerations apply to these substitutes?

A: TOP249YN has the highest inventory availability (24,110 pcs), followed by TOP259YN (2,235 pcs), and TOP248YN (5,431 pcs). For long-term production planning, TOP249YN or TOP259YN may offer superior supply chain stability.