Panasonic PM-U24 Optical Sensor: Equivalent & Substitute Parts

Part Overview

The Panasonic PM-U24 is an optical through-beam sensor module with NPN output configuration, featuring selectable Dark-ON/Light-ON operation. This unamplified sensor is designed for slot-type mounting with a 0.197" (5mm) sensing distance and wire lead connections. The PM-U24 is classified as obsolete, making identification of compatible substitute components essential for system maintenance, repair, and new design implementations where equivalent functionality is required.

Substiute Parts

PM-U24

Panasonic Industrial Automation SalesIn Stock: 1013PM-U24 Datasheet

Current PartRFQ

PM-U25

Panasonic Industrial Automation SalesIn Stock: 1858PM-U25 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute identification for the PM-U24 is based on the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Sensing method: Through-Beam operation
• Output type: NPN configuration
• Mounting interface: Chassis Mount, Module with Wire Leads
• Response time: 20µs (matching performance requirement)
• Operating temperature range: -25°C ~ 55°C
• Electrical ratings: Collector current and voltage specifications within acceptable operating margins

The PM-U25 qualifies as a substitute based on these core parameters. While the sensing distance differs (0.236" / 6mm versus 0.197" / 5mm), both sensors maintain identical response time, operating temperature range, mounting type, and NPN output configuration. The increased sensing distance of the PM-U25 represents a functional enhancement rather than a limitation, as it provides extended detection range while maintaining backward compatibility with the electrical interface and mechanical mounting footprint.

Parameter Comparison

Engineering Selection Recommendations

PM-U25 as Primary Substitute:

The PM-U25 is the designated substitute for the obsolete PM-U24 based on functional and regulatory alignment. Both sensors share identical response time (20µs), operating temperature range (-25°C ~ 55°C), mounting configuration (Chassis Mount, Module with Wire Leads), and NPN output topology. The PM-U25 maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity.

Compliance Considerations:

The PM-U24 carries RoHS Compliant certification, while the PM-U25 meets the more stringent ROHS3 standard. Both sensors maintain MSL 1 (Unlimited) moisture sensitivity rating, indicating no moisture-related handling restrictions. The PM-U25's ROHS3 compliance provides enhanced environmental and regulatory alignment with current manufacturing standards.

Inventory and Availability:

The PM-U25 is available in active inventory (1794 Pcs New Original In Stock) with bulk packaging options, providing immediate procurement capability. The PM-U24 remains available in limited quantities (957 Pcs New Original In Stock) but is classified as obsolete, indicating no future production or design-in support.

Frequently Asked Questions (FAQ)

Q: Can the PM-U25 directly replace the PM-U24 in existing applications?

A: Yes. Both sensors share identical response time (20µs), operating temperature range (-25°C ~ 55°C), NPN output configuration, and Chassis Mount mechanical interface. The PM-U25's increased sensing distance (0.236" / 6mm versus 0.197" / 5mm) provides extended detection capability without compromising electrical compatibility or mounting footprint.

Q: What is the difference in output configuration between the two sensors?

A: The PM-U24 features selectable Dark-ON/Light-ON operation, while the PM-U25 provides NPN Open Collector output. Both are NPN-based configurations suitable for standard industrial control circuits. Application-specific output mode requirements should be evaluated during system integration.

Q: Are there supply voltage differences between the PM-U24 and PM-U25?

A: The PM-U25 specifies a supply voltage range of 5V ~ 24V. The PM-U24 supply voltage is not provided in the technical parameters. System design should accommodate the PM-U25's specified voltage range to ensure proper sensor operation.

Q: How do the sensing distances affect substitution suitability?

A: The PM-U25 provides a 0.039" (1mm) greater sensing distance compared to the PM-U24. This extended range is advantageous for applications requiring increased detection capability and does not create compatibility issues. Applications with strict sensing distance requirements should verify that the 0.236" (6mm) distance of the PM-U25 meets specific slot or gap specifications.

Q: What is the significance of the product status difference?

A: The PM-U24 is classified as obsolete, indicating discontinued production and no future design-in support. The PM-U25 maintains active product status with ongoing manufacturing and supply chain support, making it the recommended choice for new designs and long-term system reliability.

Q: Are both sensors RoHS compliant?

A: Yes. The PM-U24 is RoHS Compliant, and the PM-U25 meets the more current ROHS3 standard. Both sensors satisfy environmental and regulatory requirements for industrial automation applications.