RN143-4-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN143-4-02 is a 3.9 mH, 2-line common mode choke manufactured by Schaffner EMC Inc., designed for power line filtering applications in through-hole configurations. This part operates at 4A typical current with 58 mOhm DC resistance and is rated for 250V AC operation across -40°C to 125°C. The RN143-4-02 is classified as obsolete, necessitating identification of equivalent substitute components that maintain functional compatibility while offering active product status and continued availability.

Substiute Parts

RN143-4-02

Schaffner EMC Inc.In Stock: 1183RN143-4-02 Datasheet

Current PartRFQ

RN143-4-02-3M9

Schaffner EMC Inc.In Stock: 914RN143-4-02-3M9 Datasheet

DirectRFQ

B82724B2402N001

EPCOS - TDK ElectronicsIn Stock: 1337B82724B2402N001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN143-4-02 is determined by the following critical parameters:

Direct Substitutes maintain identical or functionally equivalent electrical characteristics:

• Inductance value within acceptable tolerance (3.9 mH nominal)
• Current rating of 4A or greater
• DC resistance ≤ 65 mOhm
• 2-line common mode choke configuration
• Through-hole mounting with 4-pin horizontal package
• AC voltage rating ≥ 250V
• Operating temperature range encompassing -40°C to 125°C
• Power line filter classification
• Regulatory approvals (UR, VDE minimum)

Similar Substitutes provide functional equivalence with minor parameter deviations acceptable for power line filtering applications:

• Inductance within ±15% of 3.9 mH
• Current rating ≥ 4A
• DC resistance ≤ 70 mOhm
• Identical mounting and package configuration
• AC voltage rating ≥ 250V
• Regulatory compliance with UR, VDE, or ENEC

Parameter Comparison

Engineering Selection Recommendations

RN143-4-02-3M9 is the primary direct substitute for the obsolete RN143-4-02. Both components are manufactured by Schaffner EMC Inc. within the RN series. The RN143-4-02-3M9 maintains identical inductance (3.9 mH), current rating (4A), and physical dimensions while offering active product status. The inductance measurement frequency differs (10 kHz vs. 1 kHz), and the operating temperature maximum is reduced to 100°C; however, these parameters remain functionally compatible for standard power line filtering applications. The RN143-4-02-3M9 carries enhanced regulatory approvals (ENEC addition) and ROHS3 compliance, providing superior long-term supply chain stability.

B82724B2402N001 is a similar substitute manufactured by EPCOS - TDK Electronics. This component provides 3.3 mH inductance (15% below the main part specification) with identical 4A current rating and comparable DC resistance (65 mOhm). The B82724B2402N001 maintains full operating temperature range (-40°C to 125°C) and meets all regulatory requirements (ENEC, UR, VDE). Physical dimensions are marginally larger (25 mm height vs. 20 mm), and REACH compliance status differs. This substitute is suitable for applications where the inductance tolerance and dimensional variance are acceptable.

Selection between direct and similar substitutes depends on application-specific inductance tolerance requirements and thermal operating conditions. Direct substitutes are preferred for designs with strict inductance specifications. Similar substitutes are acceptable where inductance variation within ±15% does not impact circuit performance.

Frequently Asked Questions (FAQ)

Q: Can RN143-4-02-3M9 directly replace RN143-4-02 in existing designs?

A: Yes. Both components share identical inductance (3.9 mH), current rating (4A), DC resistance (58-59 mOhm), and physical package configuration (Horizontal, 4 PC Pin through-hole). The primary difference is product status (active vs. obsolete) and operating temperature maximum (100°C vs. 125°C). For applications operating below 100°C, direct substitution is functionally equivalent.

Q: What are the key differences between RN143-4-02-3M9 and B82724B2402N001?

A: RN143-4-02-3M9 maintains the exact 3.9 mH inductance specification, while B82724B2402N001 provides 3.3 mH (approximately 15% lower). Both support 4A current and meet regulatory requirements. B82724B2402N001 has a taller package (25 mm vs. 20 mm height) and is manufactured by a different supplier (EPCOS - TDK Electronics vs. Schaffner EMC Inc.). DC resistance is slightly higher in the B82724B2402N001 (65 mOhm vs. 58-59 mOhm).

Q: Is the inductance frequency measurement difference (1 kHz vs. 10 kHz) significant?

A: For power line filtering applications, inductance values measured at different frequencies reflect component behavior across the frequency spectrum. The RN143-4-02-3M9 measurement at 10 kHz is standard for modern component characterization. Both measurements represent the same physical component; the difference reflects measurement methodology rather than functional incompatibility.

Q: Can B82724B2402N001 be used where strict inductance tolerance is required?

A: B82724B2402N001 provides 3.3 mH inductance, representing approximately 15% deviation from the 3.9 mH specification. This component is suitable only for applications where inductance tolerance specifications permit this variance. Designs requiring inductance within ±5% should use RN143-4-02-3M9.

Q: What are the packaging differences between these substitutes?

A: RN143-4-02 and RN143-4-02-3M9 share identical physical dimensions (33.10 mm L × 32.50 mm W × 20.00 mm H) and horizontal 4-pin through-hole configuration. B82724B2402N001 has marginally larger dimensions (33.60 mm L × 32.60 mm W × 25.00 mm H). All three components use the same mounting type and pin configuration, ensuring PCB compatibility.

Q: Are there regulatory compliance differences between the substitutes?

A: RN143-4-02 carries UR and VDE approvals. RN143-4-02-3M9 and B82724B2402N001 both carry ENEC, UR, and VDE approvals, providing enhanced regulatory coverage. All three components are RoHS compliant (RoHS vs. ROHS3). B82724B2402N001 is REACH Affected, while the Schaffner components are REACH Unaffected.