Equivalent & Substitute Parts for 1SM817-T

Part Overview

The 1SM817-T is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, configured as a Single Pole Double Throw (SPDT) device with chassis mount installation. This component operates at 5A (AC/DC) with 250V AC and 30V DC voltage ratings, featuring a round pin plunger actuator and solder turret termination. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

1SM817-T

Honeywell Sensing and Productivity SolutionsIn Stock: 8511SM817-T Datasheet

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DB2CA1AA

ZF ElectronicsIn Stock: 20959DB2CA1AA Datasheet

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DC2C-A1AA

ZF ElectronicsIn Stock: 1173DC2C-A1AA Datasheet

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DC3C-A1AA

Hirose Electric Co LtdIn Stock: 1171DC3C-A1AA Datasheet

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MWZ101C01C01X01

APEM Inc.In Stock: 830MWZ101C01C01X01 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1SM817-T is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration (SPDT required)
• Switch function (On-Momentary operation)
• Actuator type (Round pin plunger)
• Mounting type (Chassis mount)
• Operating position tolerance (0.330" / 8.4mm nominal)

Electrical Compatibility Criteria:

• Current rating must equal or exceed 5A
• Voltage ratings must support minimum 250V AC and 30V DC operation
• Operating temperature range must encompass or overlap -55°C to 125°C

Mechanical Compatibility Criteria:

• Pretravel and differential travel within acceptable tolerance bands
• Mechanical life sufficient for application duty cycle

The substitute parts DB2CA1AA, DC2C-A1AA, DC3C-A1AA, and MWZ101C01C01X01 share the core SPDT circuit topology, on-momentary function, round pin plunger actuation, and chassis mount configuration. However, each substitute exhibits variations in electrical ratings, operating forces, and environmental protection ratings that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

DB2CA1AA (ZF Electronics): This substitute provides active product status with ROHS3 compliance. The 10A current rating exceeds the 5A requirement of the 1SM817-T. However, the AC voltage rating of 125V is below the 250V AC specification of the original part, restricting application to lower voltage circuits. The operating temperature range (-40°C to 120°C) does not extend to the -55°C lower limit of the original specification. Mechanical life of 10,000,000 cycles significantly exceeds the 80,000-cycle requirement. Termination style differs (solder lug versus solder turret), requiring PCB layout modification.

DC2C-A1AA (ZF Electronics): This substitute offers active product status and ROHS3 compliance with IP67 environmental protection. The 10A current rating exceeds requirements. The 125V AC voltage rating remains below the 250V AC specification. Operating temperature range (-40°C to 120°C) does not meet the -55°C lower limit. Mechanical life of 1,000,000 cycles exceeds the 80,000-cycle requirement. IP67 rating provides enhanced environmental protection compared to the unspecified ingress protection of the original. Solder lug termination requires PCB modification.

DC3C-A1AA (Hirose Electric): This substitute is classified as obsolete with incomplete technical specifications. Critical electrical parameters (current rating, voltage ratings, circuit configuration) are not provided. This part is not recommended for new design selection due to insufficient technical documentation and obsolete status.

MWZ101C01C01X01 (APEM Inc.): This substitute provides active product status with ROHS3 compliance and IP67 environmental protection. The 5A current rating matches the original specification. The 125V AC voltage rating is below the 250V AC requirement, limiting application scope. The operating temperature range (-40°C to 85°C) does not extend to either the -55°C lower limit or 125°C upper limit of the original. Mechanical life of 1,000,000 cycles exceeds the 80,000-cycle requirement. Operating position of 0.325" (8.25mm) is within acceptable tolerance of the 0.330" (8.4mm) specification. Pretravel matches the original at 0.030" (0.8mm). Solder lug termination requires PCB modification.

For applications requiring the full 250V AC rating of the 1SM817-T, none of the provided substitutes maintain complete electrical compatibility. Selection should prioritize active product status and compliance certifications (ROHS3) while evaluating voltage derating implications for the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can DB2CA1AA replace 1SM817-T in a 250V AC circuit?

A: No. DB2CA1AA is rated for 125V AC maximum, which is below the 250V AC requirement of the 1SM817-T. Using this substitute in a 250V AC circuit exceeds the component's voltage rating and creates a reliability and safety risk.

Q: What is the primary difference between DB2CA1AA and DC2C-A1AA?

A: Both are ZF Electronics SPDT switches with identical electrical ratings (10A, 125V AC). The primary difference is ingress protection: DB2CA1AA provides IP50 (dust protected), while DC2C-A1AA provides IP67 (dust tight and waterproof). DC2C-A1AA also has lower mechanical life (1,000,000 cycles versus 10,000,000 cycles).

Q: Does MWZ101C01C01X01 operate across the full temperature range of 1SM817-T?

A: No. MWZ101C01C01X01 operates from -40°C to 85°C, which does not cover the -55°C to 125°C range of the 1SM817-T. Applications requiring operation below -40°C or above 85°C cannot use this substitute.

Q: Why do the substitute parts use solder lug termination instead of solder turret?

A: Solder lug termination is a standard industry configuration for modern snap action switches. Conversion from solder turret to solder lug requires PCB layout modification but does not affect electrical function. Solder lug termination typically provides improved mechanical robustness in production assembly.

Q: Is DC3C-A1AA a viable substitute?

A: No. DC3C-A1AA has obsolete product status and incomplete technical specifications. Critical parameters including circuit configuration, current rating, and voltage ratings are not documented. This part cannot be reliably evaluated for substitution.

Q: Which substitute offers the best environmental protection?

A: Both DC2C-A1AA and MWZ101C01C01X01 provide IP67 rating (dust tight and waterproof), compared to the unspecified ingress protection of the 1SM817-T. DB2CA1AA provides IP50 (dust protected). Selection depends on application environmental requirements.

Q: Can multiple substitutes be used interchangeably in the same design?

A: No. Each substitute has different electrical ratings, operating temperature ranges, and mechanical characteristics. Substitutes must be individually qualified for the specific application circuit and environmental conditions. Mixing substitutes within a single design is not recommended without comprehensive re-qualification testing.

Q: What is the impact of different operating forces on substitution?

A: Operating force affects actuator feel and required activation pressure. The 1SM817-T has 141gf operating force. DB2CA1AA (250gf) and DC2C-A1AA (340gf) require significantly higher activation force. MWZ101C01C01X01 (153gf) is closest to the original. Higher operating force may affect user interface ergonomics and system reliability if the mechanical design is not adapted.