RN122-2.5-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN122-2.5-02 is a 5.6 mH common mode choke designed for two-line power line filtering applications. This through-hole mounted component is rated for 2.5A typical current with 105mOhm typical DC resistance and operates across -40°C to 125°C. The part carries obsolete product status, making identification of suitable alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

RN122-2.5-02

Schaffner EMC Inc.In Stock: 857RN122-2.5-02 Datasheet

Current PartRFQ

RN122-2.5-02-5M6

Schaffner EMC Inc.In Stock: 1899RN122-2.5-02-5M6 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN122-2.5-02 is determined by the following critical parameters:

• Inductance Value: 5.6 mH nominal inductance is the primary functional requirement
• Current Rating: Minimum 2.5A to maintain thermal and saturation performance
• DC Resistance: Maximum 110mOhm to ensure acceptable power loss characteristics
• Voltage Rating: Minimum 250V AC to meet safety and insulation requirements
• Mounting Configuration: Through-hole, horizontal 4-pin package for PCB compatibility
• Number of Lines: Two-line common mode filtering topology
• Regulatory Compliance: UR and VDE certifications for power line applications

The RN122-2.5-02-5M6 qualifies as a direct substitute based on matching inductance value, current rating, mounting type, pin configuration, and regulatory approvals. Frequency measurement differences (1 kHz vs 10 kHz) reflect standard industry measurement practices and do not affect functional equivalence in power line filtering applications.

Parameter Comparison

Engineering Selection Recommendations

The RN122-2.5-02-5M6 is the qualified substitute for the obsolete RN122-2.5-02. Selection is based on:

• Functional Equivalence: Identical inductance value, current rating, and two-line configuration maintain circuit performance
• Regulatory Compliance: Both parts carry UR and VDE certifications; the substitute adds ENEC certification
• Manufacturing Status: The substitute is active production, ensuring long-term availability and supply chain continuity
• Compliance Standards: The substitute meets ROHS3 requirements, aligning with current environmental regulations
• Physical Compatibility: Identical through-hole mounting and 4-pin horizontal package enable direct PCB layout compatibility
• Thermal Consideration: The substitute operates to 100°C maximum versus 125°C for the original part; applications requiring operation above 100°C require thermal analysis

Frequently Asked Questions (FAQ)

Q: Can RN122-2.5-02-5M6 be used as a direct replacement in existing designs?

A: Yes, the substitute part maintains identical inductance, current rating, mounting type, and pin configuration. PCB layouts and circuit designs require no modification. Thermal operating range differs; designs operating above 100°C require evaluation.

Q: What is the significance of the inductance measurement frequency difference (1 kHz vs 10 kHz)?

A: Inductance measurement frequency reflects standard industry test conditions and does not affect functional performance in power line filtering. Both measurements represent the same 5.6 mH nominal inductance value.

Q: Are there physical size differences between the two parts?

A: Yes. RN122-2.5-02 dimensions are 1.102" L × 1.063" W × 0.661" H (28.00mm × 27.00mm × 16.80mm). RN122-2.5-02-5M6 dimensions are 0.886" L × 0.846" W × 0.531" H (22.50mm × 21.50mm × 14.60mm). The substitute is physically smaller; PCB layout verification is required.

Q: What certifications does the substitute part carry?

A: RN122-2.5-02-5M6 carries ENEC, UR, and VDE certifications. The original part carries UR and VDE certifications. Both meet power line filtering safety requirements.

Q: Is the substitute part RoHS compliant?

A: Yes, RN122-2.5-02-5M6 is ROHS3 compliant, meeting current environmental regulations. The original part is RoHS compliant under earlier standards.

Q: What is the packaging difference?

A: RN122-2.5-02 is supplied in standard packaging. RN122-2.5-02-5M6 is supplied in tube packaging, which may affect handling and assembly processes.