LSP05GI277S Equivalent & Substitute Parts

Part Overview

The LSP05GI277S is a Type 2/Type 3 Transient Voltage Suppressor (TVS) module manufactured by Littelfuse Inc., designed for lighting surge protection at 277V with screw mounting. This single-pole device provides circuit protection through transient voltage suppression with thermal protection features. The part is currently active in production with 676 units in stock. Substitute parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs.

Substiute Parts

LSP05GI277S

Littelfuse Inc.In Stock: 755LSP05GI277S Datasheet

Current PartRFQ

SPD-20-277P

MEAN WELL USA Inc.In Stock: 840SPD-20-277P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LSP05GI277S is determined by the following critical parameters:

• Voltage - Continuous Operating (Max) (MCOV): Must support minimum 277VAC operation
• Current - Discharge (Nom) (8/20µS): Must meet or exceed 5 kA nominal discharge capability
• Mounting Type: Must be screw-mounted for mechanical compatibility
• Approval Agencies: Must maintain CE, cURus, and UL certifications for regulatory compliance
• RoHS Status: Must be ROHS3 compliant for environmental standards

The SPD-20-277P qualifies as a substitute based on these parameters, though with specific operational differences noted in the parameter comparison.

Parameter Comparison

Engineering Selection Recommendations

Both the LSP05GI277S and SPD-20-277P are active products with ROHS3 compliance and CE/cURus/UL certifications. Selection between these parts depends on application-specific requirements:

The LSP05GI277S provides higher continuous operating voltage (320VAC vs. 277VAC) and higher protection level (2.4 kV vs. 1.5 kV), with a wider operating temperature range (-40°C to 85°C). This configuration is suitable for applications requiring maximum voltage margin and extended thermal performance.

The SPD-20-277P offers higher maximum discharge current (20 kA vs. 10 kA) and dual-pole configuration, providing enhanced surge handling capacity. This configuration is suitable for applications requiring higher transient current dissipation.

Both parts maintain screw mounting compatibility and regulatory compliance across CE, cURus, and UL standards.

Frequently Asked Questions (FAQ)

Q: Can SPD-20-277P directly replace LSP05GI277S in existing installations?

A: Direct replacement requires verification of application voltage and current requirements. The SPD-20-277P has a lower MCOV (277VAC vs. 320VAC) and lower protection level (1.5 kV vs. 2.4 kV), but higher maximum discharge current (20 kA vs. 10 kA). Confirm that your circuit operates within the SPD-20-277P specifications before substitution.

Q: What is the significance of the pole count difference?

A: The LSP05GI277S is single-pole (1 pole), while the SPD-20-277P is dual-pole (2 poles). Pole count affects circuit configuration and protection topology. Verify that your installation supports dual-pole protection before substituting.

Q: Are both parts suitable for the same temperature environments?

A: No. The LSP05GI277S operates from -40°C to 85°C, while the SPD-20-277P operates from -40°C to 70°C. For applications requiring operation above 70°C, the LSP05GI277S is the appropriate selection.

Q: Do both parts meet the same regulatory standards?

A: Both parts are CE, cURus, and UL certified. The LSP05GI277S additionally carries KEMA-KEUR certification. Both are ROHS3 compliant and REACH unaffected.

Q: What packaging differences exist between these parts?

A: The LSP05GI277S is supplied in bulk packaging, while the SPD-20-277P is supplied in box packaging. This affects inventory management and handling but does not impact electrical performance.