QR/P-4S-C(51) Equivalent & Substitute Parts

Part Overview

The QR/P-4S-C(51) is a 4-position housing for female sockets connector manufactured by Hirose Electric Co Ltd, designed for rack and panel applications. This backplane connector features a blue panel mount configuration with a 0.177" (4.50mm) pitch and mating guide functionality. The part is currently classified as obsolete, making identification of active equivalent parts essential for ongoing procurement and system maintenance.

Substiute Parts

QR/P-4S-C(51)

Hirose Electric Co LtdIn Stock: 1171QR/P-4S-C(51) Datasheet

Current PartRFQ

QR/P-4S-C(21)

Hirose Electric Co LtdIn Stock: 762QR/P-4S-C(21) Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QR/P-4S-C(51) is determined by strict alignment with the following critical parameters:

• Manufacturer: Hirose Electric Co Ltd
• Series: QR/P
• Connector Type: Housing for Female Sockets
• Number of Positions: 4
• Pitch: 0.177" (4.50mm)
• Number of Rows: 2
• Connector Style: Rack and Panel
• Mounting Type: Panel Mount
• Connector Usage: Receptacle
• Color: Blue
• Features: Mating Guide
• RoHS Compliance: Required
• MSL Rating: 1 (Unlimited)

The QR/P-4S-C(21) meets all substitution criteria as an active equivalent part within the same QR/P series, maintaining identical electrical and mechanical specifications while differing only in packaging configuration and product status.

Parameter Comparison

Engineering Selection Recommendations

The QR/P-4S-C(21) is the direct active equivalent for the obsolete QR/P-4S-C(51). Both parts maintain identical electrical and mechanical specifications across all critical parameters including connector type, position count, pitch, mounting configuration, and color coding. The QR/P-4S-C(21) carries active product status with bulk packaging availability, making it the appropriate selection for new designs and ongoing procurement requirements. Both parts maintain RoHS compliance and MSL rating 1 classification, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can QR/P-4S-C(21) be used as a direct replacement for QR/P-4S-C(51)?

A: Yes. The QR/P-4S-C(21) is electrically and mechanically identical to the QR/P-4S-C(51) across all functional parameters. The primary difference is product status: QR/P-4S-C(21) is active while QR/P-4S-C(51) is obsolete.

Q: What is the difference between the two part numbers?

A: The QR/P-4S-C(51) and QR/P-4S-C(21) differ in packaging configuration and product lifecycle status. QR/P-4S-C(21) is supplied in bulk packaging and maintains active manufacturing status.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. Both parts are from the same QR/P series with identical connector specifications, pitch, mounting type, and color. They are fully interchangeable in applications requiring 4-position rack and panel receptacle housings.

Q: Do both parts meet current compliance requirements?

A: Yes. Both QR/P-4S-C(51) and QR/P-4S-C(21) are RoHS compliant and carry MSL rating 1 (Unlimited), meeting current environmental and moisture sensitivity standards.

Q: Why is the QR/P-4S-C(51) listed as obsolete?

A: Product obsolescence reflects Hirose Electric Co Ltd's lifecycle management. The QR/P-4S-C(21) represents the active continuation of this connector housing within the QR/P series.