Littelfuse 9118 Pushbutton Switch - Equivalent & Substitute Parts

Part Overview

The Littelfuse 9118 is a DPST-NC (Double Pole Single Throw - Normally Closed) pushbutton switch designed for panel mount, rear installation applications. This component operates at 12V DC with a 10A current rating and features a round silver button actuator with screw terminal connections. The product is classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

9118

Littelfuse Inc.In Stock: 11639118 Datasheet

Current PartRFQ

91050

Littelfuse/Commercial Vehicle ProductsIn Stock: 108591050 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 9118 is determined by the following critical parameters:

• Voltage Rating: Both main and substitute parts must operate at 12V DC
• Mounting Configuration: Panel mount, rear installation capability is required
• Actuator Style: Round button actuator with silver color
• Termination Interface: Connection method compatibility
• Circuit Topology: Switch configuration must support the intended electrical function
• Current Handling: Amperage rating must meet or exceed application requirements

The Littelfuse 91050 is identified as a manufacturer-recommended substitute. While this part differs in circuit configuration (3PDT vs. DPST-NC), switch function (On-Off-On vs. On-Mom), and current rating (5A vs. 10A), it maintains compatibility in voltage rating (12V DC), mounting type (panel mount, rear), actuator type (round button, silver), and physical form factor. The 91050 is an active product with current RoHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 91050 is designated as the manufacturer-recommended substitute for the obsolete Littelfuse 9118. Selection of the 91050 is supported by the following factors:

• Active Product Status: The 91050 is an active product with current manufacturing support and availability, addressing the obsolescence of the 9118
• Regulatory Compliance: The 91050 meets RoHS3 compliance requirements, whereas the 9118 is non-compliant
• Voltage Compatibility: Both parts operate at 12V DC, maintaining voltage compatibility in existing applications
• Physical Form Factor: Identical mounting type (panel mount, rear) and actuator style (round button, silver) ensure mechanical interchangeability
• Termination Consideration: The 91050 uses Quick Connect 0.250" (6.3mm) termination versus screw terminals on the 9118, requiring connection method adaptation

Circuit configuration and current rating differences between the 9118 and 91050 must be evaluated against specific application requirements. The 91050's 5A current rating is lower than the 9118's 10A rating, and the 3PDT configuration differs from the DPST-NC topology. These differences necessitate functional verification within the target application.

Frequently Asked Questions (FAQ)

Q: Why is the Littelfuse 9118 being phased out?

A: The 9118 is classified as an obsolete product. The manufacturer recommends transitioning to the active Littelfuse 91050 for new designs and ongoing applications.

Q: Can the Littelfuse 91050 directly replace the 9118 in all applications?

A: Direct replacement requires functional compatibility verification. While both parts share 12V DC voltage rating, panel mount rear configuration, and round button actuator style, the 91050 differs in circuit topology (3PDT vs. DPST-NC), switch function (On-Off-On vs. On-Mom), and current rating (5A vs. 10A). Application-specific requirements must be assessed.

Q: What is the primary difference in termination between these parts?

A: The 9118 uses screw terminal connections, while the 91050 uses Quick Connect 0.250" (6.3mm) termination. Wiring harness or connection adapter modifications may be necessary.

Q: Does the 91050 meet current regulatory standards?

A: Yes. The 91050 is RoHS3 compliant and REACH unaffected, whereas the 9118 is RoHS non-compliant.

Q: What is the current rating difference, and does it matter?

A: The 9118 is rated for 10A DC, while the 91050 is rated for 5A DC. Applications requiring current handling above 5A must be re-evaluated or alternative substitutes identified.

Q: Are there packaging differences between these parts?

A: The 91050 is supplied in bulk packaging. Verify packaging requirements for your procurement and assembly processes.