311SM4-H2 Equivalent & Substitute Parts

Part Overview

The Honeywell Sensing and Productivity Solutions 311SM4-H2 is a snap action SPDT switch rated for 5A at 250V AC and 30V DC. This through-hole mounted switch features a lever with simulated roller actuator and is designed for on-momentary operation across an operating temperature range of -55°C to 125°C. The part maintains active product status with RoHS compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary component experiences supply constraints, obsolescence, or when application requirements necessitate alternative mounting configurations or electrical ratings.

Substiute Parts

311SM4-H2

Honeywell Sensing and Productivity SolutionsIn Stock: 865311SM4-H2 Datasheet

Current PartRFQ

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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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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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 311SM4-H2 is determined by the following critical parameters:

Primary Substitution Criteria:

• Circuit configuration: SPDT (Single Pole Double Throw)
• Switch function: On-momentary operation
• Current rating: Minimum 5A AC capability
• Voltage rating: AC rating of at least 250V or DC rating of at least 30V
• Moisture sensitivity level: MSL 1 (Unlimited)
• ECCN classification: EAR99
• HTSUS code: 8536.50.7000

Secondary Compatibility Factors:

• Actuator type and mounting configuration may differ based on application requirements
• Termination style variations (PC Pin, Solder Lug) reflect different circuit board integration methods
• Operating temperature range and mechanical life specifications indicate performance envelope boundaries

The substitute parts DB1C-A1AA, DC1C-A1AA, DC2C-A1AA, and DC3C-A1AA share the SPDT circuit configuration and on-momentary function. However, each substitute presents distinct trade-offs in electrical ratings, mounting methods, and mechanical specifications that must be evaluated against specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

Active Status Substitutes:

DC1C-A1AA and DC2C-A1AA from ZF Electronics maintain active product status and carry ROHS3 compliance certification. DC1C-A1AA provides 5A AC current capability at 125V AC with 48V DC rating, suitable for applications where AC voltage requirements are reduced from the 311SM4-H2 specification. DC2C-A1AA offers elevated 10A AC current capacity at 125V AC, accommodating higher current applications with reduced voltage requirements.

Both ZF Electronics substitutes employ chassis mount configuration with solder lug termination, requiring circuit board redesign compared to the through-hole PC pin termination of the 311SM4-H2. Operating temperature range is constrained to -40°C to 120°C, and mechanical life is reduced to 1,000,000 cycles.

Obsolete Status Substitutes:

DB1C-A1AA (Hirose Electric) and DC3C-A1AA (Hirose Electric) carry obsolete product status. These parts present supply risk and should not be selected for new designs or long-term production applications. Detailed electrical specifications are not provided for these components.

Compliance Alignment:

All substitute parts share EAR99 ECCN classification, HTSUS code 8536.50.7000, and MSL 1 (Unlimited) moisture sensitivity rating with the 311SM4-H2, ensuring regulatory and environmental compliance consistency.

Frequently Asked Questions (FAQ)

Q: Can DC1C-A1AA directly replace 311SM4-H2 in existing circuit boards?

A: No. DC1C-A1AA uses chassis mount configuration with solder lug termination, while 311SM4-H2 uses through-hole mounting with PC pin termination. Circuit board redesign is required. Additionally, DC1C-A1AA is rated for 125V AC maximum, compared to 311SM4-H2's 250V AC rating.

Q: What is the primary electrical limitation of DC1C-A1AA and DC2C-A1AA substitutes?

A: Both ZF Electronics substitutes are rated for 125V AC maximum, which is 50% lower than the 311SM4-H2's 250V AC rating. Applications requiring 250V AC operation cannot use these substitutes.

Q: Why are DB1C-A1AA and DC3C-A1AA listed as substitutes if they are obsolete?

A: These parts are documented as substitutes based on the provided input data. However, obsolete product status indicates discontinued manufacturing and limited availability. Active status parts (DC1C-A1AA, DC2C-A1AA) are preferred for new applications.

Q: How does mechanical life differ between the main part and substitutes?

A: 311SM4-H2 provides 10,000,000 mechanical cycles. DC1C-A1AA and DC2C-A1AA are rated for 1,000,000 cycles, representing a 10-fold reduction in mechanical life expectancy. Applications requiring extended cycle life should retain the 311SM4-H2.

Q: Are all substitutes RoHS compliant?

A: 311SM4-H2 is RoHS Compliant. DC1C-A1AA and DC2C-A1AA are ROHS3 Compliant. DB1C-A1AA and DC3C-A1AA do not specify RoHS status. ROHS3 compliance is equivalent to RoHS compliance for component selection purposes.

Q: What is the operating temperature trade-off with ZF Electronics substitutes?

A: 311SM4-H2 operates from -55°C to 125°C. DC1C-A1AA and DC2C-A1AA operate from -40°C to 120°C. Applications requiring operation below -40°C or above 120°C cannot use ZF Electronics substitutes.

Q: Can DC2C-A1AA be used in applications requiring 5A current?

A: DC2C-A1AA is rated for 10A AC current, which exceeds the 5A requirement. However, it is only rated for 125V AC, compared to 311SM4-H2's 250V AC. Voltage compatibility must be verified before selection.

Q: What mounting considerations apply when switching from 311SM4-H2 to DC1C-A1AA or DC2C-A1AA?

A: 311SM4-H2 uses through-hole mounting suitable for PCB insertion. DC1C-A1AA and DC2C-A1AA use chassis mount configuration, requiring panel or enclosure mounting with external wiring connections. Application mechanical design must accommodate this configuration change.