PB-24MD I/O Module Rack 24 Channel Equivalent & Substitute Parts

Part Overview

The PB-24MD is a 24-channel I/O module rack manufactured by Sensata-Crydom, designed for industrial control and signal distribution applications. This product is classified as obsolete, making equivalent substitute parts necessary for system maintenance, repairs, and new installations where legacy compatibility is required. The module features card edge and screw terminal block connectors with standoff mounting, suitable for mini-style rack configurations.

Substiute Parts

PB-24MD

Sensata-CrydomIn Stock: 993PB-24MD Datasheet

Current PartRFQ

70MRCK24-EC

Grayhill Inc.In Stock: 77970MRCK24-EC Datasheet

SimilarRFQ

70MRCQ24-EC

Grayhill Inc.In Stock: 78270MRCQ24-EC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PB-24MD are qualified based on the following critical parameters that determine functional equivalence:

• Number of Channels: Must be 24 channels
• Connector Type: Must support Card Edge and Screw Terminal Blocks
• Mounting Type: Must use Standoffs
• Style: Must be Mini configuration
• Moisture Sensitivity Level: Must be MSL 1 (Unlimited)
• REACH Status: Must be REACH Unaffected
• ECCN Classification: Must be EAR99

The identified substitute parts meet all these core electrical and mechanical parameters, ensuring direct functional compatibility in applications requiring 24-channel I/O module rack functionality.

Parameter Comparison

Engineering Selection Recommendations

Both 70MRCK24-EC and 70MRCQ24-EC from Grayhill Inc. are functionally equivalent to the obsolete PB-24MD based on matching electrical and mechanical parameters. The primary distinction between the two Grayhill substitutes is RoHS compliance status.

70MRCK24-EC is RoHS non-compliant and maintains compatibility with legacy systems that do not require RoHS certification.

70MRCQ24-EC is RoHS Compliant and is suitable for applications subject to RoHS regulations or where compliance with environmental standards is mandated. Both parts are currently in active production status, ensuring availability for replacement and new installations.

Selection between these two substitutes should be based on the specific regulatory and compliance requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the 70MRCK24-EC or 70MRCQ24-EC directly replace the PB-24MD?

A: Yes. Both Grayhill substitutes match the critical parameters of the PB-24MD: 24 channels, mini style, card edge and screw terminal block connectors, standoff mounting, MSL 1, REACH Unaffected status, and EAR99 classification.

Q: What is the difference between 70MRCK24-EC and 70MRCQ24-EC?

A: The primary difference is RoHS compliance. The 70MRCK24-EC is RoHS non-compliant, while the 70MRCQ24-EC is RoHS Compliant. Both are electrically and mechanically equivalent.

Q: Why is the PB-24MD listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Sensata-Crydom. The listed substitute parts from Grayhill Inc. provide equivalent functionality for ongoing system support and new applications.

Q: Are there packaging differences between these parts?

A: The PB-24MD packaging is listed as unspecified. The 70MRCK24-EC is supplied in Bulk packaging, while the 70MRCQ24-EC packaging is unspecified. Packaging differences do not affect electrical or mechanical compatibility.

Q: Which substitute should I select for a new design?

A: Selection depends on regulatory requirements. For RoHS-regulated applications, use 70MRCQ24-EC. For applications without RoHS requirements, either substitute is acceptable based on availability and cost considerations.