Honeywell 1SM263 Equivalent & Substitute Parts

Part Overview

The Honeywell 1SM263 is a snap-action SPDT switch with chassis mount configuration, rated for 5A at 250V AC and 30V DC. This component features a round pin plunger actuator and solder lug termination, designed for applications requiring reliable switching with defined operating characteristics. The 1SM263 is classified as obsolete, making identification of active equivalent parts essential for ongoing procurement and system maintenance. The substitute part 1SM3 provides functional continuity with identical electrical and mechanical specifications while maintaining active product status.

Substiute Parts

1SM263

Honeywell Sensing and Productivity SolutionsIn Stock: 9651SM263 Datasheet

Current PartRFQ

1SM3

Honeywell Sensing and Productivity SolutionsIn Stock: 10191SM3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Honeywell 1SM263 is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute, Honeywell 1SM3, qualifies as a direct equivalent based on the following criteria:

Electrical Parameters (Must Match Exactly):

• Circuit configuration: SPDT
• Switch function: On-Momentary
• Current rating: 5A AC/DC
• Voltage rating AC: 250V
• Voltage rating DC: 30V

Mechanical Parameters (Must Match Exactly):

• Actuator type: Round pin plunger
• Mounting type: Chassis mount
• Termination style: Solder lug
• Operating force: 141gf
• Release force: 28gf
• Operating position: 0.330" (8.4mm)
• Pretravel: 0.030" (0.8mm)
• Differential travel: 0.004" (0.1mm)
• Overtravel: 0.005" (0.13mm)

Environmental & Compliance Parameters (Must Match Exactly):

• Operating temperature range: -55°C to 125°C
• Mechanical life: 80,000 cycles
• RoHS compliance: Yes
• MSL rating: 1 (Unlimited)

The 1SM3 maintains identical specifications across all parameters while offering the advantage of active product status, ensuring continued availability and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

The Honeywell 1SM3 is the direct equivalent for the obsolete 1SM263. Selection of the 1SM3 is based on:

Specification Equivalence: All electrical, mechanical, and environmental parameters are identical between the two parts. The 1SM3 maintains the same SPDT circuit configuration, 5A/250V AC rating, round pin plunger actuator, and chassis mount design.

Product Status: The 1SM3 carries active product status, ensuring ongoing manufacturer support, documented supply availability, and compliance with current industry standards. The 1SM263 is classified as obsolete, indicating discontinued production and limited future availability.

Compliance Certification: Both parts maintain RoHS compliance and MSL 1 rating. The 1SM3 continues to meet these regulatory requirements without modification.

Supply Chain Continuity: Transition from 1SM263 to 1SM3 provides uninterrupted component availability for new production and field replacement applications without requiring circuit redesign or mechanical modification.

Frequently Asked Questions (FAQ)

Q: Can the 1SM3 be used as a direct replacement for the 1SM263 in existing designs?

A: Yes. The 1SM3 is electrically and mechanically identical to the 1SM263. All parameters including current rating, voltage rating, actuator characteristics, mounting configuration, and termination style are equivalent. No circuit modification or mechanical redesign is required.

Q: What is the primary reason for substituting the 1SM263 with the 1SM3?

A: The 1SM263 is classified as obsolete, indicating discontinued production. The 1SM3 is an active product with identical specifications, ensuring continued availability and supply chain reliability for both new production and field replacement applications.

Q: Are there any differences in the mechanical mounting between these parts?

A: No. Both the 1SM263 and 1SM3 feature identical chassis mount configuration with round pin plunger actuators and solder lug termination. Physical dimensions and mounting interfaces are equivalent.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both parts are RoHS compliant with MSL 1 rating (unlimited moisture sensitivity level). Operating temperature range is identical at -55°C to 125°C, and mechanical life is specified at 80,000 cycles for both parts.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by SPDT circuit configuration, 5A current rating (AC/DC), 250V AC voltage rating, and 30V DC voltage rating. The 1SM3 matches all these parameters exactly.

Q: Are there any inventory or lead time considerations?

A: The 1SM3 is listed as active with 963 pieces in stock, providing immediate availability. The 1SM263 is obsolete with limited remaining inventory (898 pieces). For new designs and ongoing production, the 1SM3 is the recommended selection.