HCTC-1-20 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The HCTC-1-20 is a through-hole common mode choke manufactured by Signal Transformer, designed for power line filtering applications. This component provides 1 mH inductance at 1 kHz with a 20A current rating and 7 mOhm maximum DC resistance across two lines. The part is currently in active production status with 649 units available in stock. Equivalent substitute parts are identified based on matching electrical specifications and mechanical compatibility to support procurement flexibility and supply chain continuity.

Substiute Parts

HCTC-1-20

Signal TransformerIn Stock: 701HCTC-1-20 Datasheet

Current PartRFQ

8121-RC

Bourns Inc.In Stock: 35538121-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HCTC-1-20 are qualified based on the following critical parameters:

• Inductance Value: 1 mH @ 1 kHz (exact match required)
• Current Rating: 20A minimum (no reduction permitted)
• DC Resistance: 7 mOhm maximum (no increase permitted)
• Number of Lines: 2-line configuration (fixed requirement)
• Mounting Type: Through Hole (mechanical compatibility)
• Operating Temperature: -55°C ~ 105°C (environmental compatibility)
• Package Configuration: Vertical, 4 PC Pin (PCB footprint compatibility)
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The Bourns 8121-RC meets all substitution criteria and qualifies as a direct equivalent for the HCTC-1-20.

Parameter Comparison

Engineering Selection Recommendations

Both the HCTC-1-20 and 8121-RC are active production components with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these parts should be based on availability, lead time, and packaging format preference. The HCTC-1-20 is supplied in tray packaging with 649 units in stock, while the 8121-RC is supplied in bulk packaging with 3448 units available. Both components maintain identical electrical performance and thermal operating range, ensuring functional interchangeability in power line filtering applications.

Frequently Asked Questions (FAQ)

Q: Can the 8121-RC replace the HCTC-1-20 in existing designs?

A: Yes. Both components share identical electrical specifications (1 mH @ 1 kHz, 20A rating, 7 mOhm DCR), operating temperature range (-55°C ~ 105°C), and mechanical configuration (through-hole, vertical 4-pin package). The components are functionally equivalent for power line common mode choke applications.

Q: What is the physical difference between these parts?

A: The primary dimensional difference is width: the HCTC-1-20 measures 0.700" (17.78mm) wide, while the 8121-RC measures 0.900" (22.86mm) wide. Length and height are identical. PCB layout must accommodate the wider footprint of the 8121-RC.

Q: Are both parts compliant with current regulations?

A: Yes. Both the HCTC-1-20 and 8121-RC are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What packaging formats are available?

A: The HCTC-1-20 is supplied in tray packaging, while the 8121-RC is supplied in bulk packaging. Packaging selection may affect handling, storage, and procurement processes.

Q: Do these parts have different moisture sensitivity levels?

A: The HCTC-1-20 has moisture sensitivity level not applicable. The 8121-RC has MSL 1 (unlimited). Both are suitable for standard storage and handling conditions.