LSYFB1A Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSYFB1A 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 a side roller plunger actuator and plug-in termination style. The switch is rated for 10A AC at 120V and 800mA DC at 115V, making it suitable for general-purpose control circuits requiring reliable switching action.

Finding equivalent and substitute parts is necessary when the LSYFB1A reaches end-of-life status, when inventory becomes unavailable, or when design requirements necessitate alternative termination styles or enhanced environmental protection ratings.

Substiute Parts

LSYFB1A

Honeywell Sensing and Productivity SolutionsIn Stock: 984LSYFB1A 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 of the LSYFB1A with the D4A-3307-HN is based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Circuit configuration: Both are SPDT (DB/DM) switches
• Switch function: Both operate as On-Momentary switches
• Current rating: Both rated for 10A AC
• Actuator type: Both feature side roller plunger actuation
• Mounting type: Both are chassis mount designs
• RoHS compliance: Both are RoHS compliant
• Moisture sensitivity: Both rated MSL 1 (Unlimited)

Differing Parameters:

• AC voltage rating: LSYFB1A rated 120V; D4A-3307-HN rated 125V
• DC current rating: LSYFB1A rated 800mA; D4A-3307-HN rated 6A
• DC voltage rating: LSYFB1A rated 115V; D4A-3307-HN rated 30V
• Termination style: LSYFB1A uses plug-in; D4A-3307-HN uses screw terminal
• Ingress protection: LSYFB1A unspecified; D4A-3307-HN rated IP67
• Operating force: LSYFB1A 2720gf; D4A-3307-HN 2000gf
• Operating temperature: LSYFB1A -29°C to 93°C; D4A-3307-HN -10°C to 80°C

The D4A-3307-HN qualifies as a substitute for AC applications within the 120V/125V range and 10A current class, provided that the screw terminal connection is compatible with the application circuit design.

Parameter Comparison

Engineering Selection Recommendations

For AC Applications (120V/125V, 10A): The D4A-3307-HN is suitable as a substitute for the LSYFB1A in AC-only circuits. Both parts maintain RoHS compliance and MSL 1 rating. The D4A-3307-HN provides additional environmental protection with IP67 ingress rating, beneficial for applications requiring dust and moisture resistance.

Termination Compatibility: Selection between LSYFB1A and D4A-3307-HN must account for termination style differences. The LSYFB1A plug-in termination requires a compatible socket connector, while the D4A-3307-HN screw terminal requires direct wire connection. Circuit board or harness redesign may be necessary if switching between these termination styles.

Temperature Operating Range: The LSYFB1A supports a wider operating temperature range (-29°C to 93°C) compared to the D4A-3307-HN (-10°C to 80°C). Applications requiring operation below -10°C or above 80°C must retain the LSYFB1A.

DC Applications: The D4A-3307-HN is not suitable as a substitute for DC applications. The LSYFB1A supports 800mA DC at 115V, while the D4A-3307-HN is rated only 6A DC at 30V maximum. These specifications are not directly comparable for DC circuit substitution.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3307-HN replace the LSYFB1A in all applications?

A: No. The D4A-3307-HN is suitable only for AC applications operating at 120V/125V and 10A. DC applications, applications requiring operation below -10°C or above 80°C, and circuits requiring plug-in termination cannot use the D4A-3307-HN as a substitute.

Q: What is the primary difference between these two switches?

A: The primary differences are termination style (plug-in versus screw terminal), operating temperature range, and DC voltage/current ratings. Both switches share identical SPDT circuit configuration, 10A AC rating, and chassis mount design.

Q: Does the D4A-3307-HN require circuit board modifications?

A: Yes. If the original circuit design uses a plug-in connector for the LSYFB1A, the D4A-3307-HN screw terminal requires either a connector adapter or direct wire termination, necessitating circuit board or harness redesign.

Q: Are both switches RoHS compliant?

A: Yes. Both the LSYFB1A and D4A-3307-HN are RoHS compliant with MSL 1 (Unlimited) moisture sensitivity rating, suitable for standard industrial and commercial applications.

Q: What is the operating force difference between these switches?

A: The LSYFB1A requires 2720gf operating force, while the D4A-3307-HN requires 2000gf. The D4A-3307-HN actuator is lighter, requiring less force for switch activation.