PSU21635B Equivalent & Substitute Parts Reference

Part Overview

The PSU21635B is a 216 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 currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when design specifications permit alternative configurations within the same electrical and mechanical parameter range.

Substiute Parts

PSU21635B

Cornell Dubilier Electronics (CDE)In Stock: 983PSU21635B Datasheet

Current PartRFQ

PSU21635A

Cornell Dubilier Electronics (CDE)In Stock: 827PSU21635A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PSU21635B is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match Exactly):

• Capacitance: 216 µF
• Voltage Rating: 250 V
• Tolerance: 0%, +20%
• Polarization: Bi-Polar

Mechanical Parameters (Must Match Exactly):

• Package Type: Radial, Can - QC Terminals
• Mounting Type: Chassis Mount
• Diameter: 2.063 inches (52.40 mm)

Environmental & Compliance Parameters (Must Match or Exceed):

• Operating Temperature Range: -40°C to 65°C (minimum)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Application Compatibility:

• Motor Start applications

The PSU21635A qualifies as a direct substitute based on identical electrical specifications, identical package configuration, identical mounting type, and identical diameter. The height dimension differs (3.375" vs. 4.435"), which may affect space constraints in specific chassis designs but does not alter electrical or functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The PSU21635B and PSU21635A are electrically and functionally equivalent aluminum electrolytic capacitors. Both parts are manufactured by Cornell Dubilier Electronics in the active PSU series and carry identical electrical ratings, tolerance specifications, and environmental operating ranges. Both components maintain ROHS3 compliance and unlimited moisture sensitivity classification.

Dimensional Consideration:

The sole physical difference between these parts is the seated height: PSU21635B measures 3.375 inches (85.73 mm), while PSU21635A measures 4.435 inches (112.65 mm). This 1.06-inch height differential must be evaluated against available chassis clearance and PCB layout constraints. If vertical space is limited, the PSU21635B is the preferred selection. If height is not a constraint, either part is suitable.

Inventory & Availability:

PSU21635B: 890 pieces in stock PSU21635A: 813 pieces in stock

Both parts are available as new original components in bulk packaging. Selection between the two should prioritize dimensional fit requirements first, then inventory availability as a secondary factor.

Compliance & Certification:

Both parts satisfy identical regulatory requirements: ROHS3 compliance, REACH unaffected status, and EAR99 export classification. No additional compliance verification is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can PSU21635A be used as a direct replacement for PSU21635B?

A: Yes, PSU21635A is a direct electrical and functional equivalent. Both parts share identical capacitance (216 µF), voltage rating (250 V), tolerance (0%, +20%), polarization (Bi-Polar), package type (Radial, Can - QC Terminals), mounting type (Chassis Mount), and diameter (2.063 inches). The only difference is height: PSU21635B is 3.375 inches tall, while PSU21635A is 4.435 inches tall. Verify that the taller PSU21635A fits within your available chassis clearance before substitution.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by exact matching of: capacitance value (216 µF), voltage rating (250 V), tolerance band (0%, +20%), polarization type (Bi-Polar), package configuration (Radial, Can - QC Terminals), mounting type (Chassis Mount), and can diameter (2.063 inches). All of these parameters must match exactly. Height variation is acceptable provided physical space permits installation.

Q: Are there any compliance or certification differences between PSU21635B and PSU21635A?

A: No. Both parts carry identical certifications: ROHS3 compliance, REACH unaffected status, and EAR99 export classification. Both are rated for the same operating temperature range (-40°C to 65°C) and moisture sensitivity level (1 - Unlimited). No additional compliance documentation or testing is required when substituting between these parts.

Q: What is the application context for these capacitors?

A: Both PSU21635B and PSU21635A are specified for motor start applications. These aluminum electrolytic capacitors with bi-polar construction are suitable for circuits requiring temporary energy storage during motor startup sequences. The 250 V rating and 216 µF capacitance are standard for this application class.

Q: How do I determine which part to select if both are available?

A: Prioritize selection based on physical space constraints. If your chassis or mounting location has height restrictions, select PSU21635B (3.375 inches). If height is not a limiting factor, either part is suitable. Consider secondary factors such as current inventory levels and procurement lead times. Both parts are manufactured by the same supplier (Cornell Dubilier Electronics) and carry identical electrical specifications.

Q: What does "QC Terminals" mean in the package designation?

A: QC Terminals refers to quick-connect terminal lugs integrated into the capacitor can. These terminals facilitate rapid mechanical connection to motor start circuits without requiring soldering. The terminal configuration is identical on both PSU21635B and PSU21635A.

Q: Are these parts suitable for surface mount applications?

A: No. Both PSU21635B and PSU21635A are chassis mount components with radial, can-style construction. They are designed for through-hole or direct chassis mounting only. Surface mount land size is not specified for these parts, indicating they are not compatible with surface mount assembly processes.