Equivalent & Substitute Parts for 11SM303-T2

Part Overview

The 11SM303-T2 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis mount switch features a round pin plunger actuator with solder turret termination, rated for 1A at 125V AC and 30V DC. The device is designed for On-Momentary operation with an operating temperature range of -55°C to 125°C and mechanical life of 10,000,000 cycles. The part is currently Active and RoHS Compliant.

Substitute parts become necessary when the 11SM303-T2 reaches end-of-life status, inventory depletion occurs, or when alternative electrical and mechanical specifications better suit specific application requirements while maintaining functional compatibility.

Substiute Parts

11SM303-T2

Honeywell Sensing and Productivity SolutionsIn Stock: 115811SM303-T2 Datasheet

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DB1C-A1AA

Hirose Electric Co LtdIn Stock: 919DB1C-A1AA Datasheet

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DC1C-A1AA

ZF ElectronicsIn Stock: 21897DC1C-A1AA Datasheet

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DC3C-A1AA

Hirose Electric Co LtdIn Stock: 1171DC3C-A1AA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 11SM303-T2 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Actuator type must be Round (Pin Plunger)
• Mounting type must be Chassis Mount
• Voltage rating (AC) must be minimum 125V
• Current rating must support 1A operation
• Operating temperature range must encompass the application requirements
• Moisture Sensitivity Level must be 1 (Unlimited)

Secondary Considerations:

• Termination style variations (Solder Turret vs. Solder Lug) are acceptable if circuit board design accommodates the alternative
• Mechanical life ratings above 10,000,000 cycles provide enhanced durability
• Enhanced ingress protection ratings provide additional environmental robustness
• Product status (Active vs. Obsolete) affects long-term availability and support

The substitute parts DB1C-A1AA, DC1C-A1AA, and DC3C-A1AA share the core SPDT circuit configuration and On-Momentary function with compatible actuator and mounting specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: DC1C-A1AA (ZF Electronics)

The DC1C-A1AA is the only substitute part with Active product status, ensuring continued availability and manufacturer support. This part maintains SPDT circuit configuration and On-Momentary function with identical 125V AC voltage rating and compatible 1A DC current rating. The DC1C-A1AA features enhanced DC voltage rating (48V vs. 30V), providing greater margin for DC applications. The part is ROHS3 Compliant and carries REACH Unaffected status, meeting current regulatory requirements. Enhanced ingress protection (IP67) provides superior environmental robustness compared to the 11SM303-T2. Termination style differs (Solder Lug vs. Solder Turret), requiring circuit board design verification. Mechanical life of 1,000,000 cycles is lower than the 11SM303-T2, suitable for applications not requiring extended cycle life.

Secondary Options: DB1C-A1AA and DC3C-A1AA

Both DB1C-A1AA and DC3C-A1AA carry Obsolete product status, indicating discontinued manufacturing and limited future availability. These parts should be selected only when inventory constraints on the primary recommendation exist and long-term supply is not a consideration. Detailed electrical specifications for these parts are not provided in available documentation, requiring direct manufacturer consultation before selection.

Selection Criteria Summary:

• Active product status preferred for new designs and long-term applications
• Verify termination style compatibility with existing circuit board designs
• Confirm operating temperature range requirements (-40°C to 120°C for DC1C-A1AA vs. -55°C to 125°C for 11SM303-T2)
• Evaluate mechanical life requirements against application duty cycle
• Validate DC voltage rating adequacy (48V for DC1C-A1AA vs. 30V for 11SM303-T2)

Frequently Asked Questions (FAQ)

Q: Can DC1C-A1AA directly replace 11SM303-T2 without circuit board modifications?

A: DC1C-A1AA maintains SPDT circuit configuration, On-Momentary function, and identical 125V AC rating. However, termination style differs (Solder Lug vs. Solder Turret), requiring circuit board design review. Mechanical mounting and electrical connection points must be verified for compatibility.

Q: What is the significance of the Obsolete product status for DB1C-A1AA and DC3C-A1AA?

A: Obsolete status indicates the manufacturer has discontinued production. These parts should not be selected for new designs or applications requiring long-term supply assurance. Existing inventory may be available, but future replenishment is not guaranteed.

Q: How do the mechanical life ratings compare across substitute options?

A: The 11SM303-T2 provides 10,000,000 cycles mechanical life. DC1C-A1AA provides 1,000,000 cycles. For applications requiring extended cycle life beyond 1,000,000 cycles, the 11SM303-T2 is the appropriate selection. For applications with cycle life requirements below 1,000,000 cycles, DC1C-A1AA is suitable.

Q: What is the impact of the different DC voltage ratings?

A: The 11SM303-T2 is rated for 30V DC maximum. DC1C-A1AA is rated for 48V DC maximum. Applications operating at DC voltages between 30V and 48V require DC1C-A1AA. Applications operating below 30V DC are compatible with both parts.

Q: Are all substitute parts RoHS compliant?

A: The 11SM303-T2 is RoHS Compliant. DC1C-A1AA is ROHS3 Compliant. DB1C-A1AA and DC3C-A1AA RoHS status is not specified in available documentation. For applications requiring RoHS compliance verification, DC1C-A1AA provides documented ROHS3 Compliant status.

Q: What does IP67 ingress protection on DC1C-A1AA provide?

A: IP67 rating indicates the part is dust tight and waterproof. The 11SM303-T2 does not specify ingress protection. DC1C-A1AA is suitable for applications requiring environmental protection against dust and moisture exposure.

Q: How do the operating temperature ranges differ?

A: The 11SM303-T2 operates from -55°C to 125°C. DC1C-A1AA operates from -40°C to 120°C. Applications requiring operation below -40°C or above 120°C require the 11SM303-T2. Applications within the -40°C to 120°C range are compatible with DC1C-A1AA.

Q: What inventory considerations should influence part selection?

A: The 11SM303-T2 has 1122 units in stock. DC1C-A1AA has 21871 units in stock, providing significantly greater availability. For applications with extended lead time requirements or high-volume procurement, DC1C-A1AA offers superior inventory position.