PSU18935B Equivalent & Substitute Parts Reference

Part Overview

The PSU18935B is a 189 µF, 250 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in the PSU series. This component features radial, can-style construction with QC terminals and is designed for motor start applications. The part is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when inventory constraints, lead time requirements, or application-specific needs necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

PSU18935B

Cornell Dubilier Electronics (CDE)In Stock: 866PSU18935B Datasheet

Current PartRFQ

PSU18935A

Cornell Dubilier Electronics (CDE)In Stock: 940PSU18935A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PSU18935B is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Capacitance: 189 µF (exact match required)
• Voltage Rating: 250 V (exact match required)
• Tolerance: 0%, +20% (exact match required)
• Polarization: Bi-Polar (exact match required)
• Operating Temperature Range: -40°C to 65°C (exact match required)

Mechanical Parameters:

• Package Type: Radial, Can - QC Terminals (exact match required)
• Mounting Type: Chassis Mount (exact match required)
• Diameter: 2.063" (52.40 mm) (exact match required)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)
• REACH Status: REACH Unaffected (exact match required)

The PSU18935A qualifies as a direct substitute based on identical electrical, mechanical, and compliance specifications. The only variance is in the seated height dimension, which does not affect electrical performance or standard chassis mounting applications.

Parameter Comparison

Engineering Selection Recommendations

Both PSU18935B and PSU18935A are Active product status components with full regulatory compliance. Selection between these parts is based on the following engineering criteria:

PSU18935B Selection Criteria:

• Applications requiring maximum vertical clearance constraints (3.375" seated height)
• Designs with limited enclosure depth
• Original equipment specifications calling for PSU18935B designation

PSU18935A Selection Criteria:

• Applications with adequate vertical clearance (4.375" seated height)
• Inventory availability prioritization
• Designs where the additional 1.0" height does not conflict with mechanical constraints

Both parts maintain identical electrical performance, thermal characteristics, and regulatory compliance. The height differential is the sole distinguishing factor and does not affect capacitance, voltage rating, tolerance, temperature range, or polarization specifications. Chassis mounting compatibility is maintained for both variants.

Frequently Asked Questions (FAQ)

Q: Can PSU18935A be used as a direct replacement for PSU18935B?

A: Yes, PSU18935A is a direct electrical equivalent. Both parts share identical capacitance (189 µF), voltage rating (250 V), tolerance (0%, +20%), operating temperature range (-40°C to 65°C), polarization (Bi-Polar), and package type (Radial, Can - QC Terminals). The only difference is seated height: PSU18935B measures 3.375" while PSU18935A measures 4.375". Substitution is valid provided the additional height does not conflict with mechanical design constraints.

Q: What are the critical parameters that must match for substitution?

A: Substitution requires exact equivalence in: capacitance value, voltage rating, tolerance specification, polarization type, operating temperature range, package configuration, mounting type, and diameter dimension. All regulatory compliance designations (RoHS3, REACH status, MSL rating) must also match.

Q: Does the height difference affect electrical performance?

A: No. The height variance between PSU18935B (3.375") and PSU18935A (4.375") is a mechanical dimension only. Electrical characteristics, including capacitance, voltage rating, tolerance, and temperature performance, are identical.

Q: Are both parts RoHS3 compliant?

A: Yes. Both PSU18935B and PSU18935A carry ROHS3 Compliant designation and REACH Unaffected status, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What applications are these capacitors designed for?

A: Both parts are specified for motor start applications, utilizing bi-polar aluminum electrolytic construction with QC terminal connections for reliable performance in motor circuit configurations.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed. Mechanical interchangeability depends on available vertical clearance in the design. If the original design accommodates 3.375" height, PSU18935B is the specified choice. If clearance permits 4.375" height, PSU18935A is acceptable. Verify mechanical constraints before substitution.