LSYFC1A Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSYFC1A is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, classified as an SPDT (Single Pole Double Throw) switch with side roller plunger actuation. This component is designed for chassis mount applications requiring 10A AC switching at 120V or 800mA DC at 115V. The switch operates in an On-Momentary function and is currently in active production status with 845 units in stock.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and circuit configuration can be maintained within the allowed parameter tolerances for this switch category. The primary substitute identified is the D4A-3307-HN from Omron Automation and Safety.

Substiute Parts

LSYFC1A

Honeywell Sensing and Productivity SolutionsIn Stock: 931LSYFC1A Datasheet

Current PartRFQ

D4A-3307-HN

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The D4A-3307-HN qualifies as a substitute for the LSYFC1A based on the following substitution criteria:

Matching Parameters:

• Circuit configuration: Both are SPDT (DB/DM) switches
• Switch function: Both operate in On-Momentary mode
• Actuator type: Both use side roller plunger actuation
• Mounting type: Both are chassis mount configurations
• Differential travel: Both specify 0.025" (0.6mm)
• RoHS compliance: Both are RoHS Compliant
• MSL rating: Both are MSL 1 (Unlimited)

Allowable Variations:

• AC voltage rating: 120V (LSYFC1A) vs. 125V (D4A-3307-HN) — within standard industrial tolerance
• AC current rating: Both rated 10A
• DC current rating: 800mA (LSYFC1A) vs. 6A (D4A-3307-HN) — substitute exceeds requirement
• DC voltage rating: 115V (LSYFC1A) vs. 30V (D4A-3307-HN) — substitute exceeds requirement
• Operating temperature: -12°C to 121°C (LSYFC1A) vs. -10°C to 80°C (D4A-3307-HN) — substitute covers lower range with reduced upper limit
• Pretravel: 0.100" (2.5mm) vs. 0.094" (2.4mm) — within tolerance
• Overtravel: 0.190" (4.8mm) vs. 0.201" (5.1mm) — within tolerance
• Operating force: 2720gf (LSYFC1A) vs. 2000gf (D4A-3307-HN) — substitute requires lower actuation force

Parameter Comparison

Engineering Selection Recommendations

LSYFC1A Selection Criteria:

• Primary choice when plug-in termination is required
• Applications requiring operation up to 121°C
• Systems where 2720gf operating force is specified or preferred
• Designs utilizing Honeywell component ecosystems

D4A-3307-HN Selection Criteria:

• Substitute when screw terminal connections are acceptable or preferred
• Applications with maximum operating temperature not exceeding 80°C
• Systems where lower actuation force (2000gf) is beneficial
• Designs utilizing Omron component ecosystems
• Applications requiring IP67 ingress protection (dust tight, waterproof)
• Designs benefiting from status indicator functionality

Both parts maintain active production status and RoHS compliance. Selection between these components should be based on termination style requirements, operating temperature envelope, and mechanical force specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3307-HN directly replace the LSYFC1A without modification?

A: Direct replacement is not possible due to termination style differences. The LSYFC1A uses plug-in termination while the D4A-3307-HN uses screw terminals. Terminal adaptation or rewiring is required.

Q: What is the maximum operating temperature difference between these switches?

A: The LSYFC1A operates to 121°C while the D4A-3307-HN operates to 80°C maximum. Applications requiring temperatures above 80°C must use the LSYFC1A.

Q: Are both switches rated for the same AC current?

A: Yes, both switches are rated for 10A AC. However, DC current ratings differ: LSYFC1A is rated 800mA DC while D4A-3307-HN is rated 6A DC.

Q: What does the difference in operating force mean for application design?

A: The LSYFC1A requires 2720gf actuation force while the D4A-3307-HN requires 2000gf. Applications with limited actuation force capability should consider the D4A-3307-HN. Conversely, applications requiring higher actuation force for reliability should specify the LSYFC1A.

Q: Does the D4A-3307-HN offer any additional features?

A: Yes, the D4A-3307-HN includes IP67 ingress protection (dust tight, waterproof) and a status indicator, features not specified for the LSYFC1A.

Q: Are both parts compliant with RoHS regulations?

A: Yes, both the LSYFC1A and D4A-3307-HN are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of the pretravel and overtravel specifications?

A: Pretravel (0.100" for LSYFC1A, 0.094" for D4A-3307-HN) is the distance the actuator travels before electrical contact occurs. Overtravel (0.190" for LSYFC1A, 0.201" for D4A-3307-HN) is the additional distance the actuator can travel after contact without damage. Both values are within acceptable tolerance for substitution.