170684K250ME

Part Overview

The 170684K250ME is a 0.68 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 250VDC voltage rating, designed for DC link and DC filtering applications. This part is classified as obsolete, requiring identification of suitable substitute components for procurement and design continuity. The MPW series substitute offers the same electrical specifications with active product status and modern compliance certifications.

Substiute Parts

170684K250ME

Cornell Dubilier Electronics (CDE)In Stock: 1202170684K250ME Datasheet

Current PartRFQ

684MPW250K

Cornell Dubilier / Illinois CapacitorIn Stock: 859684MPW250K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence of the following critical parameters:

• Electrical Match: Capacitance (0.68 µF), tolerance (±10%), voltage ratings (250V DC / 200V AC), and dielectric material (Polypropylene, Metallized) must be identical.
• Physical Compatibility: Axial through-hole package with PC pin termination ensures mechanical fit in existing PCB layouts.
• Environmental Compliance: Operating temperature range (-55°C to 105°C), MSL rating (1), and REACH/ECCN status must support the application without restriction.
• Application Alignment: DC link and DC filtering functionality remains consistent across approved substitutes.

The 684MPW250K meets all substitution criteria, providing direct functional replacement for the obsolete 170684K250ME within the same electrical, mechanical, and compliance boundaries.

Parameter Comparison

Engineering Selection Recommendations

The 684MPW250K (Illinois Capacitor, Series MPW) serves as the direct substitute for the obsolete 170684K250ME. Selection is supported by:

• Product Status: The 684MPW250K is active and in full production, ensuring long-term availability and supply chain stability.
• Regulatory Compliance: ROHS3 compliance provides superior environmental and health protection standards compared to the RoHS status of the original part, which requires inventory verification.
• Electrical Equivalence: Identical capacitance, tolerance, voltage ratings, and dielectric composition guarantee functional compatibility in DC link and DC filtering circuits.
• Physical Compatibility: Matching axial through-hole package, PC pin termination, and similar physical dimensions (12.50mm diameter × 29.00mm length versus 12.00mm × 28.00mm) permit direct board-level substitution.
• Environmental Certification: Both parts maintain MSL 1 rating and REACH unaffected status, supporting unrestricted use in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 684MPW250K be directly substituted for the 170684K250ME in existing designs? A: Yes. Both components are electrically and mechanically equivalent 0.68 µF / 250V axial film capacitors with identical tolerance, voltage ratings, dielectric composition, and termination type. The minimal physical dimension variation (0.50mm diameter and 1.00mm length difference) poses no compatibility issues in standard through-hole PCB layouts.

Q: What is the primary reason for substitution? A: The 170684K250ME is classified as obsolete. The 684MPW250K provides continued access to the same electrical and mechanical functionality with active production status and modern regulatory compliance (ROHS3).

Q: Are there any electrical performance differences between these parts? A: Electrical specifications are identical across capacitance, tolerance, voltage ratings, operating temperature range, dielectric material, and intended applications. The 170684K250ME specifies an ESR of 32 mOhms; the 684MPW250K does not specify ESR in the provided documentation, but both maintain low-ESR characteristics suitable for DC filtering.

Q: Does package compatibility require PCB redesign? A: No redesign is required. Both parts use identical axial through-hole packages with PC pin termination. The slight size variation falls within standard PCB tolerance margins for lead pitch and component body spacing.

Q: Are compliance certifications equivalent between these parts? A: The 684MPW250K provides superior compliance status (ROHS3 Compliant) compared to the original part (RoHS status requires verification). Both maintain REACH unaffected and EAR99 classifications, supporting unrestricted global distribution and use.

Q: Is inventory available for both parts? A: The 170684K250ME has 1,140 pieces in stock as new original inventory. The 684MPW250K has 768 pieces available as new original inventory, providing adequate supply for design transitions.