CDHC301K2R3SR Equivalent & Substitute Parts

Part Overview

The CDHC301K2R3SR is a 300 F supercapacitor manufactured by Cornell Dubilier Electronics (CDE) with a rated voltage of 2.3 V and an equivalent series resistance (ESR) of 25 mOhm. This component is designed for through-hole mounting in radial, can snap-in package configuration. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and procurement planning.

Substiute Parts

CDHC301K2R3SR

Cornell Dubilier Electronics (CDE)In Stock: 1164CDHC301K2R3SR Datasheet

Current PartRFQ

XB3550-2R5307-R

Eaton - Electronics DivisionIn Stock: 769XB3550-2R5307-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDHC301K2R3SR is determined by the following critical parameters:

Capacitance Match: The substitute part must maintain 300 F capacitance to preserve circuit functionality.

Voltage Rating: The substitute must have a voltage rating equal to or greater than 2.3 V. A higher voltage rating (2.5 V) is acceptable as it provides additional safety margin.

Package Compatibility: The substitute must use radial, can snap-in through-hole mounting to ensure mechanical and electrical compatibility with existing PCB designs.

Lead Spacing and Physical Dimensions: The substitute must accommodate the 0.394" (10.00 mm) lead spacing and fit within the spatial constraints of the application. Variations in overall diameter and height must be evaluated against available board space.

ESR and Thermal Performance: While ESR and lifetime specifications may vary, these parameters should be reviewed to ensure the substitute meets application performance requirements.

Compliance: The substitute must maintain RoHS compliance status appropriate for the target application.

Parameter Comparison

Engineering Selection Recommendations

The XB3550-2R5307-R (Eaton) supercapacitor is electrically equivalent to the CDHC301K2R3SR based on matching 300 F capacitance and through-hole radial snap-in package configuration. The substitute offers improved electrical performance with lower ESR (7 mOhm versus 25 mOhm) and extended thermal lifetime (1500 Hrs @ 70°C versus 1000 Hrs @ 50°C).

Product Status Advantage: The XB3550-2R5307-R is classified as active, ensuring continued availability and supply chain stability compared to the obsolete CDHC301K2R3SR.

Compliance: Both parts maintain RoHS compliance, meeting regulatory requirements for the target application.

Physical Considerations: The substitute part has larger physical dimensions (1.378" diameter, 2.126" height) and different lead spacing (0.886" versus 0.394"). These dimensional differences require verification against available PCB space and mounting hole patterns before implementation.

Voltage Rating: The 2.5 V rating of the substitute exceeds the 2.3 V requirement, providing additional operational margin without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the XB3550-2R5307-R directly replace the CDHC301K2R3SR without PCB modification?

A: Electrical substitution is valid based on matching capacitance and voltage compatibility. However, physical dimensions and lead spacing differ. PCB layout verification is required to confirm mechanical fit and mounting hole alignment.

Q: What is the significance of the different lead spacing (10.00 mm versus 22.50 mm)?

A: Lead spacing determines the distance between mounting holes on the PCB. The substitute requires different hole positioning. Existing PCB designs must be evaluated for compatibility or redesigned to accommodate the new spacing.

Q: Does the lower ESR of the substitute part affect circuit operation?

A: Lower ESR (7 mOhm versus 25 mOhm) represents improved electrical performance. This reduces resistive losses and heat generation, which is beneficial for most applications. Circuit operation remains compatible.

Q: Why is the substitute part larger in physical size?

A: Physical size differences are inherent to different manufacturer designs. The larger diameter (35.00 mm versus 22.00 mm) and height (54.00 mm versus 47.00 mm) must be accommodated within the available board space.

Q: Is the higher voltage rating (2.5 V versus 2.3 V) a concern?

A: No. A higher voltage rating provides additional safety margin and does not negatively impact circuit operation when the applied voltage remains at or below 2.3 V.

Q: What is the impact of the different tolerance specifications?

A: The CDHC301K2R3SR has -5%, +10% tolerance, while the XB3550-2R5307-R has ±10% tolerance. The substitute's tolerance is wider on the lower end. For applications requiring tighter capacitance control, this difference should be evaluated.

Q: How does the extended thermal lifetime of the substitute affect reliability?

A: The XB3550-2R5307-R is rated for 1500 Hrs @ 70°C compared to 1000 Hrs @ 50°C for the original part. This indicates improved thermal stability and longer operational life under elevated temperature conditions.