FSL538HPG Equivalent & Substitute Parts

Part Overview

The FSL538HPG is an offline switch flyback converter IC manufactured by onsemi, designed for power management applications requiring isolated DC-DC conversion. This 7-PDIP through-hole component operates at 130kHz switching frequency with 21W power capability and comprehensive fault protection including current limiting, overload, overvoltage, and overtemperature protection.

The FSL538HPG is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support legacy system maintenance and repairs.

Substiute Parts

FSL538HPG

onsemiIn Stock: 3764FSL538HPG Datasheet

Current PartRFQ

FSL518HPG

onsemiIn Stock: 4079FSL518HPG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSL538HPG is based on strict alignment of the following critical parameters:

• Topology: Flyback converter architecture
• Voltage - Breakdown: 800V rating
• Voltage - Start Up: 16V threshold
• Frequency - Switching: 130kHz operation
• Fault Protection: Current Limiting, Over Load, Over Power, Over Temperature, Over Voltage
• Control Features: EN and Soft Start functionality
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads through-hole configuration
• Mounting Type: Through Hole

The FSL518HPG meets all these critical parameters and is identified as a parametric equivalent. Power rating variance (15W vs 21W) does not disqualify substitution when application requirements permit lower power handling.

Parameter Comparison

Engineering Selection Recommendations

Both the FSL538HPG and FSL518HPG are classified as obsolete products. Selection between these parts should be based on application power requirements and supply chain availability.

The FSL538HPG provides 21W power capability. The FSL518HPG provides 15W power capability. Applications requiring power handling above 15W must use the FSL538HPG. Applications operating within 15W power envelope may use either part.

Both parts maintain identical electrical characteristics across voltage breakdown, startup voltage, switching frequency, fault protection, control features, and operating temperature range. Both are ROHS3 compliant and share identical through-hole 7-PDIP packaging, ensuring direct PCB compatibility.

Current inventory availability: FSL538HPG (3701 pcs), FSL518HPG (4030 pcs).

Frequently Asked Questions (FAQ)

Q: Can FSL518HPG replace FSL538HPG in all applications?

A: FSL518HPG can replace FSL538HPG only in applications where power requirements do not exceed 15W. The FSL518HPG is rated for 15W maximum power, while FSL538HPG is rated for 21W. Applications requiring power handling between 15W and 21W must use FSL538HPG.

Q: Are these parts pin-compatible?

A: Yes. Both FSL538HPG and FSL518HPG use identical 8-DIP (0.300", 7.62mm) 7-lead through-hole packaging. Pin configuration is identical, enabling direct PCB substitution without layout modification.

Q: What is the significance of the obsolete product status?

A: Both parts are classified as obsolete, indicating onsemi has discontinued active production and support. Substitution between these parts addresses supply continuity for legacy designs. No newer generation replacements are specified in the provided data.

Q: Do these parts have identical fault protection?

A: Yes. Both FSL538HPG and FSL518HPG provide identical fault protection: current limiting, overload, overpower, overtemperature, and overvoltage protection. Control features (EN and Soft Start) are also identical.

Q: Are there compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.