FE2X27-4-2 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The FE2X27-4-2 is a 2-line common mode choke manufactured by Pulse Electronics, rated for 700mA maximum current with 820mOhm DC resistance. This through-hole component operates across -40°C to 125°C and is rated for 250V AC. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

FE2X27-4-2

Pulse ElectronicsIn Stock: 982FE2X27-4-2 Datasheet

Current PartRFQ

FE2X10-3-2NL

Pulse ElectronicsIn Stock: 1222FE2X10-3-2NL Datasheet

Parametric EquivalentRFQ

ALFT-03A-6

Abracon LLCIn Stock: 976ALFT-03A-6 Datasheet

SimilarRFQ

B82724J2142N001

EPCOS - TDK ElectronicsIn Stock: 2056B82724J2142N001 Datasheet

SimilarRFQ

CAV-0.8-27

Talema Group LLCIn Stock: 1058CAV-0.8-27 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FE2X27-4-2 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Number of Lines: 2 (all substitutes maintain this requirement)
• Mounting Type: Through Hole (all substitutes use through-hole mounting)
• Package / Case: Vertical, 4 PC Pin (all substitutes use this configuration)
• Voltage Rating - AC: 250V (all substitutes meet or exceed this rating)
• Operating Temperature Range: -40°C ~ 125°C (all substitutes support this range)

Current and Resistance Tolerance:

• Current Rating: 700mA minimum (substitutes rated at 700mA or higher)
• DC Resistance: Substitutes range from 460mOhm to 800mOhm, within acceptable tolerance for common mode choke applications

Parametric Equivalent: FE2X10-3-2NL matches the FE2X27-4-2 across all critical parameters with identical current rating (700mA) and comparable DC resistance (740mOhm vs. 820mOhm). This part is active and represents the closest functional replacement.

Similar Substitutes: ALFT-03A-6, B82724J2142N001, and CAV-0.8-27 provide functional substitution with variations in inductance specifications and current ratings, suitable for applications where the exact electrical characteristics of the primary equivalent are not available.

Parameter Comparison

Engineering Selection Recommendations

First Choice: FE2X10-3-2NL This Pulse Electronics part is the parametric equivalent to the FE2X27-4-2. It maintains identical current rating (700mA), comparable DC resistance (740mOhm), and all critical electrical and mechanical parameters. The part is active with RoHS compliance and REACH unaffected status, making it suitable for new designs and production continuity.

Alternative Selections:

CAV-0.8-27 (Talema Group LLC) is suitable when FE2X10-3-2NL is unavailable. It provides 800mA current rating with 674mOhm DC resistance, both within acceptable tolerance for the FE2X27-4-2 application. Operating temperature range (-40°C ~ 125°C) matches the original part. ROHS3 compliance and REACH unaffected status support regulatory requirements.

ALFT-03A-6 (Abracon LLC) offers functional substitution with 700mA current rating and 800mOhm DC resistance. Note that the operating temperature range is limited to -25°C ~ 85°C, which does not extend to the full -40°C lower limit of the original part. This substitution is appropriate only for applications not requiring full temperature range coverage.

B82724J2142N001 (EPCOS - TDK Electronics) provides higher current capacity (1.4A) and lower DC resistance (460mOhm typical), making it suitable for applications requiring improved thermal performance. Operating temperature range (-40°C ~ 125°C) matches the original specification. ROHS3 compliance and approvals from ENEC, UR, and VDE support high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can FE2X10-3-2NL be used as a direct replacement for FE2X27-4-2? A: Yes. FE2X10-3-2NL is the parametric equivalent with matching current rating (700mA), comparable DC resistance (740mOhm vs. 820mOhm), and identical electrical and mechanical specifications. It is the recommended first choice for direct substitution.

Q: What is the difference between "Parametric Equivalent" and "Similar" substitutes? A: Parametric equivalents match all critical electrical and mechanical parameters of the original part. Similar substitutes meet the core functional requirements (2-line, through-hole, 250V AC, 700mA or higher current) but may have variations in inductance, DC resistance, or temperature range. Similar substitutes require application-level verification.

Q: Can B82724J2142N001 be used in place of FE2X27-4-2? A: B82724J2142N001 is functionally compatible with higher current capacity (1.4A vs. 700mA) and lower DC resistance (460mOhm vs. 820mOhm). It is suitable for applications where improved thermal performance is beneficial. Verify that the higher current rating and lower resistance do not affect circuit behavior in your specific application.

Q: Why does ALFT-03A-6 have a limited operating temperature range? A: ALFT-03A-6 operates from -25°C to 85°C, which does not extend to the -40°C lower limit of the FE2X27-4-2. This substitution is appropriate only for applications operating within the -25°C to 85°C range. For applications requiring full -40°C to 125°C coverage, use FE2X10-3-2NL, CAV-0.8-27, or B82724J2142N001.

Q: Are all substitute parts RoHS compliant? A: Yes. FE2X10-3-2NL, ALFT-03A-6, B82724J2142N001, and CAV-0.8-27 are all RoHS compliant (RoHS or ROHS3). The original FE2X27-4-2 RoHS status was not specified.

Q: What is the physical size difference between these parts? A: All substitute parts use the same vertical 4-pin through-hole package configuration. Physical dimensions vary slightly: FE2X10-3-2NL is the smallest (18.39mm L x 13.41mm W), while B82724J2142N001 is the largest (31.30mm L x 18.50mm W). Verify PCB layout compatibility before selection.

Q: Can these parts be used interchangeably in existing designs? A: FE2X10-3-2NL can be used interchangeably as the parametric equivalent. For similar substitutes (ALFT-03A-6, B82724J2142N001, CAV-0.8-27), verify that variations in DC resistance, inductance, and physical dimensions do not affect circuit performance. Application-level testing is recommended for similar substitutes.