FSQ110 Equivalent & Substitute Parts

Part Overview

The FSQ110 is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 8-DIP through-hole component operates at 100kHz switching frequency with 17W power capacity and integrated fault protection including current limiting, overload, overtemperature, and overvoltage protection.

The FSQ110 is classified as obsolete. Identifying suitable substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

FSQ110

onsemiIn Stock: 6426FSQ110 Datasheet

Current PartRFQ

NCP1075AAP100G

onsemiIn Stock: 908NCP1075AAP100G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSQ110 is determined by the following critical parameters:

Topology & Isolation: Both the main part and substitute must maintain flyback topology with isolated output configuration to preserve circuit functionality.

Electrical Specifications: Substitute parts must support the required voltage supply range (minimum 8V input capability), switching frequency (100kHz), and fault protection features (current limiting, overtemperature, overvoltage protection).

Package Compatibility: The FSQ110 uses 8-DIP through-hole packaging. Substitute parts must be compatible with this footprint or require minimal PCB redesign.

Power Rating: The substitute must support equivalent or greater power handling capacity (minimum 14W).

Thermal & Environmental: Operating temperature range and compliance certifications (RoHS3, REACH) must be maintained.

The NCP1075AAP100G qualifies as a manufacturer-recommended substitute based on these criteria, despite minor differences in package lead count and electrical specifications within acceptable operating margins.

Parameter Comparison

Engineering Selection Recommendations

The NCP1075AAP100G is the manufacturer-recommended substitute for the obsolete FSQ110. Selection is supported by the following factors:

Product Status: The NCP1075AAP100G maintains active manufacturing status, ensuring long-term availability and supply chain continuity compared to the obsolete FSQ110.

Compliance & Certifications: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for equivalent applications.

Electrical Compatibility: The substitute operates within the same switching frequency (100kHz) and topology (flyback, isolated), with enhanced fault protection including short circuit detection. The higher breakdown voltage (700V vs. 650V) and wider operating temperature range (-40°C to 125°C vs. -25°C to 85°C) provide improved reliability margins.

Package Consideration: The NCP1075AAP100G uses a 7-lead configuration within the same 8-DIP physical footprint. PCB layout verification is required to confirm pin compatibility and unused lead handling.

Power Rating Variance: The substitute is rated at 14W compared to the FSQ110's 17W. Application designs operating below 14W power levels are directly compatible. Designs requiring the full 17W capacity require thermal and circuit analysis to confirm feasibility with the substitute.

Frequently Asked Questions (FAQ)

Q: Can the NCP1075AAP100G directly replace the FSQ110 without PCB modifications?

A: Physical footprint compatibility exists (both use 8-DIP through-hole packaging), but the NCP1075AAP100G uses 7 leads versus the FSQ110's 8 leads. Pin-to-pin verification against schematic and PCB layout is required. Unused lead handling must be confirmed before implementation.

Q: What is the impact of the 14W vs. 17W power rating difference?

A: The NCP1075AAP100G is rated 3W lower than the FSQ110. Applications designed for 14W or less operate within specification. Applications requiring 15W-17W output require thermal analysis and may need circuit optimization or derating.

Q: Does the substitute provide equivalent fault protection?

A: The NCP1075AAP100G provides enhanced protection with current limiting, overpower, overtemperature, overvoltage, and short circuit protection. The FSQ110 includes current limiting, overload, overtemperature, and overvoltage protection. The substitute's additional short circuit protection is a functional improvement.

Q: Are there supply chain advantages to using the substitute?

A: Yes. The NCP1075AAP100G is actively manufactured with 824 units in stock, compared to the obsolete FSQ110 with 6361 units in remaining inventory. Active production status ensures long-term availability for future production runs or repairs.

Q: What is the operating temperature range difference?

A: The FSQ110 operates -25°C to 85°C (TA), while the NCP1075AAP100G operates -40°C to 125°C (TJ). The substitute supports a wider temperature envelope, providing improved reliability in extreme thermal environments.

Q: Is the higher breakdown voltage (700V vs. 650V) a concern?

A: No. Higher breakdown voltage provides additional safety margin and does not negatively impact circuit operation. This is a beneficial specification improvement.