Littelfuse 37300800430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37300800430 is an 80 mA, 250 V AC/DC board mount fuse with fast blow response characteristics. This through-hole radial fuse is designed for circuit protection in electronic equipment requiring reliable overcurrent protection. The part is actively manufactured and maintained in production inventory, with 934 units currently in stock. Alternative equivalent parts may be required due to supply chain considerations, inventory availability, or specific application certifications.

Substiute Parts

37300800430

Littelfuse Inc.In Stock: 97537300800430 Datasheet

Current PartRFQ

37300800410

Littelfuse Inc.In Stock: 113437300800410 Datasheet

DirectRFQ

37000800430

Littelfuse Inc.In Stock: 138737000800430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 37300800430 are classified based on strict electrical and mechanical parameter alignment:

Direct Manufacturer Equivalent (37300800410): This part shares identical electrical specifications with the main part, including 80 mA current rating, 250 V AC voltage rating, fast blow response, and identical physical dimensions (0.335" Dia x 0.315" H). Both parts belong to the TR5® 373 series and carry the same approval agencies (CSA, cULus). The primary distinction is packaging batch designation, with 1083 units in current inventory.

Parametric Equivalent (37000800430): This part maintains electrical compatibility through matching current rating (80 mA), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), package style (radial, can, vertical), and physical dimensions (0.335" Dia x 0.315" H). However, this part belongs to the TR5® 370 series and carries different approval certifications (CCC, cURus, SEMKO, VDE instead of CSA, cULus). The melting I²t value differs (0.0014 versus 0.00037), reflecting different thermal characteristics within the same functional class.

Substitution eligibility is determined by matching: current rating, voltage rating, response time, mounting type, package style, and physical dimensions. Series designation and approval agency differences do not preclude substitution when electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

37300800410 Selection: This part is the preferred direct equivalent when supply of the primary part 37300800430 is constrained. Both parts carry identical electrical ratings, thermal characteristics (melting I²t = 0.00037), and approval certifications (CSA, cULus). Physical dimensions and mounting characteristics are identical. Selection of 37300800410 introduces no functional or compliance differences.

37000800430 Selection: This part is suitable for applications where alternative approval certifications (CCC, cURus, SEMKO, VDE) satisfy regional or customer requirements. The electrical parameters (80 mA, 250 V, fast blow) and physical form factor remain identical. The higher melting I²t value (0.0014 versus 0.00037) indicates different thermal response characteristics; this part exhibits slower thermal response within the fast blow classification. Selection of 37000800430 is appropriate only when the application does not require the specific thermal profile of the primary part or when alternative certifications are mandated by design specifications or regional standards.

All three parts maintain active production status and are currently in inventory. Selection should be based on certification requirements, thermal response specifications, and supply availability.

Frequently Asked Questions (FAQ)

Q: Can 37300800410 be used as a direct replacement for 37300800430?

A: Yes. Both parts share identical electrical specifications (80 mA, 250 V AC), response time (fast blow), thermal characteristics (melting I²t = 0.00037), physical dimensions (0.335" Dia x 0.315" H), and approval certifications (CSA, cULus). No functional or compliance differences exist between these parts.

Q: What is the difference between 37300800430 and 37000800430?

A: The primary differences are series designation (TR5® 373 versus TR5® 370), approval certifications (CSA, cULus versus CCC, cURus, SEMKO, VDE), and melting I²t value (0.00037 versus 0.0014). Electrical ratings, mounting type, package style, and physical dimensions are identical. The higher melting I²t of 37000800430 indicates slower thermal response within the fast blow classification.

Q: Are all three parts physically interchangeable?

A: Yes. All three parts share identical physical dimensions (0.335" Dia x 0.315" H), mounting type (through hole), and package style (radial, can, vertical). PCB footprints and mounting hole spacing are identical.

Q: Which part should be selected for international applications?

A: Selection depends on regional certification requirements. The 37300800430 and 37300800410 carry CSA and cULus certifications suitable for North American applications. The 37000800430 carries CCC, cURus, SEMKO, and VDE certifications, making it suitable for applications requiring European (VDE, SEMKO) or Chinese (CCC) compliance.

Q: Does the difference in melting I²t affect circuit protection performance?

A: The melting I²t value defines the thermal energy required to melt the fuse element. Both parts are classified as fast blow fuses at 80 mA. The 37000800430 exhibits a higher melting I²t (0.0014 versus 0.00037), indicating it requires greater thermal energy to operate. This difference may affect response time in transient overcurrent conditions; selection should be based on specific circuit protection requirements.

Q: Are all parts RoHS3 compliant?

A: Yes. All three parts (37300800430, 37300800410, and 37000800430) are ROHS3 compliant and REACH unaffected.