NCP1071STCT3G Equivalent & Substitute Parts

Part Overview

The NCP1071STCT3G is an offline flyback converter IC manufactured by onsemi, designed for isolated power supply applications. This device integrates an internal switch and operates at 130kHz switching frequency with 14W power capability. The part is currently classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. Active equivalent and substitute parts are available from the same manufacturer family with maintained or enhanced specifications.

Substiute Parts

NCP1071STCT3G

onsemiIn Stock: 700NCP1071STCT3G Datasheet

Current PartRFQ

NCP1075STCT3G

onsemiIn Stock: 36233NCP1075STCT3G Datasheet

SimilarRFQ

NCP1071STBT3G

onsemiIn Stock: 9108NCP1071STBT3G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NCP1071STCT3G is determined by the following critical parameters:

Primary Compatibility Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 700V minimum
• Voltage - Supply (Vcc/Vdd): 6.3V ~ 10V operating range
• Duty Cycle: 68%
• Voltage - Start Up: 8.2V
• Operating Temperature: -40°C ~ 125°C (TJ)
• Package / Case: TO-261-4 or TO-261AA
• Mounting Type: Surface Mount

Secondary Compatibility Criteria:

• Switching Frequency: 100kHz to 130kHz acceptable range
• Power (Watts): Equal to or greater than 14W
• Fault Protection: Must include Over Load, Over Temperature, Over Voltage, and Short Circuit protection

The NCP1075STCT3G qualifies as a similar manufacturer part with enhanced power rating (19W) and additional current limiting protection. The NCP1071STBT3G qualifies as a parametric equivalent with identical power rating (14W) but operates at 100kHz switching frequency.

Parameter Comparison

Engineering Selection Recommendations

NCP1075STCT3G (Similar Manufacturer Part): This part is recommended as the primary substitute for new designs and production continuity. It maintains all critical electrical parameters of the NCP1071STCT3G while offering enhanced power capability (19W versus 14W) and additional current limiting fault protection. The part is in active production status with substantial inventory availability (36,200 pcs). Both parts share identical switching frequency (130kHz), supply voltage range, and thermal specifications. ROHS3 compliance and MSL-1 rating are maintained.

NCP1071STBT3G (Parametric Equivalent): This part is suitable for applications where switching frequency variation is acceptable. It maintains identical power rating (14W) and all critical electrical parameters except switching frequency, which operates at 100kHz instead of 130kHz. The part is in active production status with good inventory availability (9,011 pcs). ROHS3 compliance and MSL-1 rating are maintained. This option is appropriate for designs with frequency-tolerant transformer and filter components.

Both substitute parts are manufactured by onsemi, maintain the same package footprint (TO-261-4, TO-261AA), and are surface mount compatible with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can NCP1075STCT3G directly replace NCP1071STCT3G in existing designs?

A: Yes. The NCP1075STCT3G maintains all critical electrical parameters including topology, isolation, voltage ratings, duty cycle, startup voltage, and operating temperature range. The identical switching frequency (130kHz) and package footprint (TO-261-4, TO-261AA) ensure direct PCB compatibility. The enhanced power rating (19W) and additional current limiting protection provide improved performance margins.

Q: What is the difference between NCP1071STBT3G and NCP1071STCT3G?

A: The primary difference is switching frequency: NCP1071STBT3G operates at 100kHz while NCP1071STCT3G operates at 130kHz. All other electrical parameters, power rating (14W), package footprint, and thermal specifications are identical. The packaging differs (Tape & Reel for NCP1071STBT3G versus standard packaging for NCP1071STCT3G), but both use the same TO-261-4 case.

Q: Are all three parts ROHS3 compliant?

A: Yes. NCP1071STCT3G, NCP1075STCT3G, and NCP1071STBT3G are all ROHS3 compliant with MSL-1 (Unlimited) moisture sensitivity rating.

Q: Which substitute should I choose for a new design?

A: NCP1075STCT3G is recommended for new designs. It offers the same switching frequency as the original part (130kHz) with enhanced power capability (19W) and additional current limiting protection. It is in active production with high inventory availability.

Q: Can I use NCP1071STBT3G if my application requires 130kHz switching frequency?

A: No. NCP1071STBT3G operates at 100kHz and is not suitable for applications with strict 130kHz frequency requirements. Use NCP1075STCT3G instead, which maintains the 130kHz switching frequency.

Q: What is the inventory status of these parts?

A: NCP1071STCT3G (obsolete): 681 pcs. NCP1075STCT3G (active): 36,200 pcs. NCP1071STBT3G (active): 9,011 pcs.