LSF3K8 Equivalent & Substitute Parts Reference

Part Overview

The LSF3K8 is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) switch is designed for chassis mount applications with screw terminal connections. The device operates at 10A AC (120V) and 800mA DC (115V) with a side roller plunger actuator in vertical position configuration.

Substitute parts are identified when equivalent electrical ratings, circuit configurations, and mechanical mounting specifications align within acceptable operational parameters. The LSF3K8 has one documented equivalent: the Omron D4A-3307-HN.

Substiute Parts

LSF3K8

Honeywell Sensing and Productivity SolutionsIn Stock: 971LSF3K8 Datasheet

Current PartRFQ

D4A-3307-HN

Omron Automation and SafetyIn Stock: 908D4A-3307-HN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LSF3K8 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit type: SPDT (DB/DM) configuration
• Switch function: On-Momentary operation
• Actuator mechanism: Side roller plunger
• Mounting interface: Chassis mount with screw terminals
• Electrical ratings: AC current capacity of 10A minimum; AC voltage rating of 120V or higher
• Regulatory compliance: RoHS compliant status

The Omron D4A-3307-HN satisfies these core substitution requirements. Both switches share identical circuit topology, actuator design, mounting methodology, and termination approach. Both maintain RoHS compliance and active product status.

Parameter Comparison

Engineering Selection Recommendations

LSF3K8 (Honeywell) Selection Criteria:

• Applications requiring DC voltage operation up to 115V
• Environments with extended temperature range requirements (-12°C minimum)
• Systems where higher operating force (2720gf) is acceptable or required
• Designs prioritizing Honeywell component ecosystem integration

D4A-3307-HN (Omron) Selection Criteria:

• Applications requiring enhanced DC current capacity (6A versus 800mA)
• Environments with IP67 ingress protection requirements (dust tight, waterproof)
• Systems where lower operating force (2000gf) is preferred for reduced actuation effort
• Designs prioritizing Omron component ecosystem integration
• Applications with documented electrical life requirements (1,000,000 cycles specified)

Both parts maintain active product status and full RoHS compliance. Selection between these switches should be based on specific application voltage, current, environmental protection, and actuation force requirements rather than general substitution preference.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3307-HN directly replace the LSF3K8 in all applications?

A: Direct replacement is possible in AC applications at 120V/10A. However, DC applications require evaluation. The LSF3K8 supports 115V DC at 800mA, while the D4A-3307-HN supports only 30V DC at 6A. If your application uses DC voltage above 30V, the D4A-3307-HN is not suitable. Additionally, the D4A-3307-HN provides IP67 environmental protection, which the LSF3K8 does not specify.

Q: What is the significance of the operating force difference (2720gf vs. 2000gf)?

A: Operating force represents the pressure required to actuate the switch. The LSF3K8 requires 720gf more force than the D4A-3307-HN. In applications with mechanical linkages or manual actuation, this difference affects user effort and system design. The lower force requirement of the D4A-3307-HN may reduce wear on mechanical components.

Q: Are the pretravel and overtravel differences functionally significant?

A: The differences are minimal (0.006" in pretravel, 0.011" in overtravel). Both switches maintain identical differential travel (0.025"). These variations are within typical mechanical tolerances and do not affect functional compatibility in standard applications. However, designs with tight mechanical constraints should verify these specifications against system requirements.

Q: Why does the LSF3K8 have a wider operating temperature range?

A: The LSF3K8 operates from -12°C to 93°C, while the D4A-3307-HN operates from -10°C to 80°C. The Honeywell switch provides 2°C lower minimum temperature capability and 13°C higher maximum temperature capability. Applications in extreme cold environments or high-temperature enclosures may require the LSF3K8 specifically.

Q: What does the IP67 rating on the D4A-3307-HN mean for substitution?

A: IP67 indicates dust-tight and waterproof protection. The LSF3K8 does not specify an ingress protection rating. If your application requires environmental sealing against dust or moisture, the D4A-3307-HN provides this protection as an additional feature. If environmental protection is not required, this difference is not relevant to substitution decisions.

Q: Are both switches RoHS compliant?

A: Yes. Both the LSF3K8 and D4A-3307-HN are RoHS compliant, meeting regulatory requirements for hazardous substance restrictions in electronic components.

Q: What is the significance of the electrical life specification (1,000,000 cycles) for the D4A-3307-HN?

A: The D4A-3307-HN specifies 1,000,000 electrical cycles, indicating documented switch life under electrical load. The LSF3K8 does not provide this specification in the available data. For applications requiring quantified reliability metrics, the Omron specification provides measurable performance data.