RN142-1-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN142-1-02 is a 33 mH, 2-line common mode choke designed for power line filtering applications with through-hole mounting. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part delivers 1A typical current rating with 810mOhm DC resistance and operates across -40°C to 125°C. Schaffner EMC Inc. manufactures this component with UR and VDE approvals for industrial and commercial power conditioning systems.

Substiute Parts

RN142-1-02

Schaffner EMC Inc.In Stock: 1042RN142-1-02 Datasheet

Current PartRFQ

RN142-1-02-33M

Schaffner EMC Inc.In Stock: 1060RN142-1-02-33M Datasheet

DirectRFQ

EH20-0.3-02-33M

Schaffner EMC Inc.In Stock: 811EH20-0.3-02-33M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN142-1-02 is determined by the following critical parameters: 2-line configuration, through-hole mounting, horizontal 4-pin package, and inductance value of 33 mH. Current rating, DC resistance, voltage rating, and operating temperature range define the functional boundaries within which substitutes operate.

Two substitute parts are identified:

Direct Substitute (RN142-1-02-33M): Maintains identical inductance (33 mH), current rating (1A), DC resistance (810mOhm), mounting type, and package configuration. Differs in measurement frequency (10 kHz vs. 1 kHz), AC voltage rating (300V vs. 250V), and operating temperature upper limit (100°C vs. 125°C). Product status is active.

Similar Substitute (EH20-0.3-02-33M): Maintains 33 mH inductance and 2-line through-hole configuration but operates at reduced current rating (300mA vs. 1A) and elevated DC resistance (1.78Ohm vs. 810mOhm). Measurement frequency differs (400 Hz vs. 1 kHz). Physical dimensions are smaller. Operating temperature range is -25°C to 100°C. Product status is active.

Parameter Comparison

Engineering Selection Recommendations

RN142-1-02-33M (Direct Substitute): This part is the primary replacement for the obsolete RN142-1-02. It maintains electrical equivalence in inductance, current rating, and DC resistance while offering active product status and enhanced compliance (ROHS3, ENEC certification). The 300V AC voltage rating exceeds the original 250V specification. The reduced operating temperature upper limit (100°C vs. 125°C) must be evaluated against application thermal requirements. Identical physical footprint ensures PCB compatibility.

EH20-0.3-02-33M (Similar Substitute): This part is suitable only for applications where current requirements do not exceed 300mA. The significantly higher DC resistance (1.78Ohm vs. 810mOhm) results in greater power dissipation and heat generation. Smaller physical dimensions may offer space advantages in constrained layouts. Absence of approval agency certifications requires evaluation against application regulatory requirements. Operating temperature range is more restrictive (-25°C to 100°C).

Frequently Asked Questions (FAQ)

Q: Can RN142-1-02-33M directly replace RN142-1-02 in all applications?

A: RN142-1-02-33M is electrically equivalent for inductance, current rating, and DC resistance. The primary consideration is the reduced operating temperature upper limit (100°C vs. 125°C). Applications operating above 100°C ambient or with thermal margins below 25°C require thermal analysis. Physical footprint is identical, enabling direct PCB substitution.

Q: What are the limitations of EH20-0.3-02-33M as a substitute?

A: EH20-0.3-02-33M is limited to applications with maximum current draw of 300mA. The 1.78Ohm DC resistance generates approximately 2.2 times more heat than the original part at rated current. Operating temperature range is restricted to -25°C to 100°C. Absence of regulatory certifications (UR, VDE, ENEC) may disqualify this part for regulated applications. Smaller physical dimensions require PCB layout verification.

Q: How do measurement frequencies affect inductance specifications?

A: Inductance values are frequency-dependent. RN142-1-02 specifies 33 mH @ 1 kHz, RN142-1-02-33M specifies 33 mH @ 10 kHz, and EH20-0.3-02-33M specifies 33 mH @ 400 Hz. All three parts deliver the same nominal inductance value across their respective measurement frequencies. Application frequency response characteristics should be verified against the specific measurement frequency of the selected part.

Q: Are packaging differences significant for through-hole assembly?

A: RN142-1-02 and RN142-1-02-33M use identical horizontal 4-pin packages with matching dimensions (33.10mm x 32.50mm x 20.00mm). EH20-0.3-02-33M uses a smaller horizontal 4-pin package (21.00mm x 21.00mm x 18.80mm). Smaller dimensions may require PCB layout modification but maintain through-hole mounting compatibility. Packaging format (tube vs. tray) affects handling and assembly processes but not electrical performance.

Q: What compliance differences exist between substitute parts?

A: RN142-1-02 carries UR and VDE approvals. RN142-1-02-33M carries ENEC, UR, and VDE approvals with ROHS3 compliance. EH20-0.3-02-33M carries ROHS3 compliance but lacks regulatory agency certifications. Applications requiring specific regulatory approvals must select parts with matching certification marks.