LSF3K5 Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSF3K5 is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. It is configured as a Single Pole Double Throw (SPDT) switch with a side roller plunger actuator, designed for chassis mount applications with screw terminal connections. The switch is rated for 10A AC at 120V and 800mA DC at 115V, with an operating temperature range of -12°C to 93°C.

Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain compatibility across manufacturing batches and procurement cycles.

Substiute Parts

LSF3K5

Honeywell Sensing and Productivity SolutionsIn Stock: 806LSF3K5 Datasheet

Current PartRFQ

D4A-3307-HN

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSF3K5 snap action switch is determined by strict alignment of electrical and mechanical parameters. The following criteria establish substitution eligibility:

Electrical Compatibility Requirements:

• Circuit configuration must be SPDT (DB/DM)
• Switch function must be On-Momentary
• Current rating must support minimum 10A AC operation
• Voltage rating must support minimum 120V AC operation
• DC ratings must be compatible with 800mA at 115V or higher

Mechanical Compatibility Requirements:

• Actuator type must be Side Roller Plunger
• Mounting type must be Chassis Mount
• Termination style must be Screw Terminal
• Pretravel and differential travel must be within acceptable tolerance ranges
• Operating force characteristics must be suitable for the intended application

Compliance Requirements:

• RoHS Compliant status required
• MSL rating of 1 or equivalent
• Active product status preferred for long-term availability

The D4A-3307-HN from Omron Automation and Safety meets these substitution criteria and is listed as an equivalent part for the LSF3K5.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: LSF3K5

The LSF3K5 remains the primary choice when available. It is actively manufactured by Honeywell Sensing and Productivity Solutions, carries RoHS Compliant certification, and operates across a wider temperature range (-12°C to 93°C), providing greater flexibility for applications with extended environmental requirements.

Substitute Selection: D4A-3307-HN

The D4A-3307-HN from Omron Automation and Safety is an acceptable substitute when LSF3K5 availability is constrained. Both parts share identical circuit configuration (SPDT), switch function (On-Momentary), current rating (10A AC), and mechanical mounting characteristics (chassis mount with screw terminals).

Key Considerations for Substitution:

The D4A-3307-HN exhibits higher electrical ratings (125V AC, 30V DC, 6A DC) compared to the LSF3K5 requirements, making it suitable for applications within the LSF3K5 specification envelope. The operating force differential (2000gf versus 2720gf) indicates the D4A-3307-HN requires lower actuation force; this must be evaluated against specific application requirements to ensure proper mechanical engagement.

The D4A-3307-HN operates within a narrower temperature range (-10°C to 80°C) compared to the LSF3K5 (-12°C to 93°C). Applications requiring operation below -10°C or above 80°C must retain the LSF3K5.

Both parts carry identical RoHS Compliance and MSL 1 ratings, ensuring equivalent environmental and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3307-HN directly replace the LSF3K5 in all applications?

A: The D4A-3307-HN is electrically and mechanically compatible with the LSF3K5 for applications operating within the temperature range of -10°C to 80°C. Applications requiring operation outside this range must use the LSF3K5. The lower operating force (2000gf versus 2720gf) must be evaluated for specific mechanical engagement requirements.

Q: What are the key electrical differences between these parts?

A: Both parts are rated for 10A AC operation. The D4A-3307-HN carries higher DC ratings (6A at 30V versus 800mA at 115V for the LSF3K5). For applications operating within LSF3K5 specifications, the D4A-3307-HN provides equivalent or superior electrical performance.

Q: Are there packaging or inventory considerations?

A: Both parts are supplied in bulk packaging. Current inventory shows 700 pieces of LSF3K5 and 898 pieces of D4A-3307-HN available as new original stock. Procurement decisions should account for lead times and supply chain requirements specific to your organization.

Q: How do the mechanical characteristics compare?

A: Both parts feature identical SPDT circuit configuration, side roller plunger actuators, chassis mount design, and screw terminal connections. Pretravel (0.100" versus 0.094") and overtravel (0.190" versus 0.201") are within functional tolerance. Differential travel is identical at 0.025".

Q: What compliance certifications apply to both parts?

A: Both the LSF3K5 and D4A-3307-HN are RoHS Compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are classified under ECCN EAR99 for export control purposes.

Q: Which part should be specified for new designs?

A: For new designs without temperature constraints below -10°C or above 80°C, either part is acceptable. The LSF3K5 is recommended when extended temperature operation is required. The D4A-3307-HN may be preferred when lower actuation force is beneficial to system design.