FSQ0170RNA Equivalent & Substitute Parts

Part Overview

The FSQ0170RNA is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This device operates at 100kHz switching frequency with 20W power capability and integrates internal switching functionality with comprehensive fault protection including current limiting, overload, overtemperature, and overvoltage protection.

The FSQ0170RNA is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure availability for new production runs or system updates.

Substiute Parts

FSQ0170RNA

onsemiIn Stock: 18724FSQ0170RNA Datasheet

Current PartRFQ

NCP1077AAP100G

onsemiIn Stock: 1086NCP1077AAP100G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FSQ0170RNA must satisfy the following critical parameters to ensure functional equivalence:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 700V minimum
• Voltage - Supply Range: Compatible with 8V ~ 20V input
• Frequency - Switching: 100kHz operation
• Fault Protection: Current limiting, overtemperature, and overvoltage protection
• Mounting Type: Through hole configuration
• Package Compatibility: DIP package format

The NCP1077AAP100G meets these substitution criteria while offering enhanced specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The NCP1077AAP100G is the manufacturer-recommended substitute for the FSQ0170RNA. Both devices are manufactured by onsemi and maintain ROHS3 compliance and REACH unaffected status.

The NCP1077AAP100G offers the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• Extended operating temperature range (-40°C ~ 125°C) provides broader thermal performance envelope
• Increased power rating (31W versus 20W) accommodates higher power applications
• Enhanced fault protection includes short circuit detection in addition to standard protections
• Lower startup voltage (8.4V versus 12V) enables operation in lower input voltage conditions
• Expanded supply voltage range (6.5V ~ 20V) provides greater input flexibility

Both devices share identical switching frequency (100kHz), breakdown voltage (700V), isolated topology, and through-hole DIP packaging. The NCP1077AAP100G operates with 7 leads within an 8-DIP package footprint, maintaining mechanical compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can the NCP1077AAP100G directly replace the FSQ0170RNA in existing designs?

A: The NCP1077AAP100G maintains mechanical and electrical compatibility with the FSQ0170RNA. Both devices use identical 8-DIP (0.300", 7.62mm) through-hole packaging and share the same switching frequency, breakdown voltage, and isolated flyback topology. The NCP1077AAP100G operates with 7 leads within the 8-DIP footprint. Design verification is required to confirm pin-to-pin functional equivalence for your specific application.

Q: What are the key differences between these two devices?

A: The primary differences are product status, power rating, and operating temperature range. The NCP1077AAP100G is an active product with 31W power capability and -40°C ~ 125°C operating range, compared to the obsolete FSQ0170RNA with 20W power and -25°C ~ 85°C range. The NCP1077AAP100G also includes short circuit protection and operates with a lower startup voltage (8.4V versus 12V).

Q: Are both devices RoHS compliant?

A: Yes, both the FSQ0170RNA and NCP1077AAP100G are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the 7-lead configuration in the 8-DIP package?

A: The NCP1077AAP100G uses 7 active leads within an 8-DIP package footprint. This configuration maintains physical compatibility with the original 8-DIP socket while utilizing only 7 pins for functional connections. Verify pin assignments in the device datasheet to ensure correct circuit implementation.

Q: Why is the NCP1077AAP100G recommended as the substitute?

A: The NCP1077AAP100G is the manufacturer-recommended substitute specified by onsemi. It maintains functional equivalence across critical parameters including topology, isolation, switching frequency, and breakdown voltage while offering enhanced specifications and active product status for improved supply chain reliability.