FSQ100 Equivalent & Substitute Parts

Part Overview

The FSQ100 is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. Operating at 67kHz switching frequency with 13W power capacity, this component integrates internal switching functionality with comprehensive fault protection including current limiting, overload, over-temperature, and over-voltage protection. The FSQ100 is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

FSQ100

onsemiIn Stock: 35397FSQ100 Datasheet

Current PartRFQ

NCP1075AAP065G

onsemiIn Stock: 1218NCP1075AAP065G Datasheet

MFR RecommendedRFQ

FSDM311A

onsemiIn Stock: 1910FSDM311A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FSQ100 are identified based on functional equivalence within the offline flyback converter category. The primary substitution criteria are:

Core Functional Parameters:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated switching element
• Fault Protection: Minimum coverage of current limiting, over-temperature, and over-voltage protection

Electrical Compatibility Parameters:

• Voltage - Breakdown: 650V or higher
• Voltage - Supply Range: Overlap with 7V ~ 20V specification
• Frequency - Switching: 65kHz ~ 67kHz range
• Power Rating: 13W or higher capacity

Physical Compatibility Parameters:

• Package / Case: 8-DIP form factor or compatible pinout
• Mounting Type: Through Hole

Two substitute parts meet these criteria: FSDM311A (parametric equivalent) and NCP1075AAP065G (manufacturer recommended).

Parameter Comparison

Engineering Selection Recommendations

FSDM311A - Parametric Equivalent

The FSDM311A provides direct parametric equivalence to the FSQ100 across all critical electrical and mechanical specifications. Both components share identical voltage breakdown (650V), supply voltage range (7V ~ 20V), switching frequency (67kHz), power rating (13W), duty cycle (67%), and startup voltage (9V). Package configuration and fault protection features are identical. The FSDM311A is also classified as obsolete with equivalent compliance certifications (ROHS3, REACH Unaffected, EAR99). This component is suitable for direct substitution in existing designs without circuit modification.

NCP1075AAP065G - Manufacturer Recommended Alternative

The NCP1075AAP065G is the active product recommendation from onsemi for FSQ100 replacement. This component maintains functional compatibility through flyback topology, isolated output, and integrated switching. Key electrical parameters show enhanced specifications: 700V breakdown voltage (50V higher margin), extended supply voltage range (6.5V minimum vs. 7V), and increased power capacity (14W vs. 13W). The operating temperature range extends to -40°C ~ 125°C, providing broader environmental coverage. Fault protection is enhanced with short-circuit detection in addition to standard protections. The primary design consideration is the 7-lead PDIP configuration within an 8-DIP package footprint, requiring PCB layout verification for pin compatibility. Product status is active, ensuring long-term availability and support.

Frequently Asked Questions (FAQ)

Q: Can FSQ100 be directly replaced with FSDM311A?

A: Yes. The FSDM311A is a parametric equivalent with identical electrical specifications (650V breakdown, 7V ~ 20V supply, 67kHz switching, 13W power) and package configuration (8-DIP through-hole). No circuit modifications are required.

Q: What are the key differences between FSQ100 and NCP1075AAP065G?

A: The NCP1075AAP065G offers enhanced specifications: higher breakdown voltage (700V vs. 650V), lower minimum supply voltage (6.5V vs. 7V), increased power capacity (14W vs. 13W), extended operating temperature range (-40°C ~ 125°C vs. -25°C ~ 85°C), and additional short-circuit fault protection. The component uses a 7-lead PDIP configuration within an 8-DIP footprint, requiring pin compatibility verification.

Q: Why is FSQ100 obsolete and what are my options?

A: The FSQ100 is classified as obsolete by onsemi. For new designs or production continuation, the NCP1075AAP065G is the active manufacturer recommendation. For existing inventory management, the FSDM311A provides parametric equivalence, though it is also obsolete. The NCP1075AAP065G ensures long-term availability and support.

Q: Are there package compatibility concerns with NCP1075AAP065G?

A: The NCP1075AAP065G uses a 7-lead PDIP configuration within an 8-DIP package footprint. While the physical dimensions are compatible (0.300", 7.62mm), the pinout differs from the 8-lead FSQ100. PCB layout and schematic verification is required to confirm pin-to-pin compatibility before substitution.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. FSQ100, FSDM311A, and NCP1075AAP065G are all ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All components meet the same regulatory requirements for industrial and commercial applications.

Q: What is the difference between parametric equivalent and manufacturer recommended?

A: FSDM311A is a parametric equivalent, matching all electrical and mechanical specifications of FSQ100 but sharing the same obsolete status. NCP1075AAP065G is the manufacturer recommended active alternative, offering enhanced specifications and long-term availability, making it the preferred choice for new designs and production continuity.