5TTP 400 Equivalent & Substitute Parts

Part Overview

The 5TTP 400 is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor, designed for through-hole mounting applications. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity. Active alternatives maintain the same electrical ratings and mechanical form factor while offering improved compliance status and broader certification coverage.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	100A (5TTP), 35A (5STP)

Substitute Part Grouping Explanation

Substitution eligibility for the 5TTP 400 is determined by strict equivalence across the following critical parameters:

Current Rating: 400 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

The 5TTP 400-R qualifies as a direct manufacturer equivalent with identical electrical and mechanical specifications. The 5STP 400-R qualifies as a parametric equivalent, maintaining all critical electrical and mechanical parameters while differing in breaking capacity (35A vs. 100A) and melting I²t characteristics (0.81 vs. 1.6).

Parameter Comparison

Parameter	5TTP 400 (Main)	5TTP 400-R (Direct Equivalent)	5STP 400-R (Parametric Equivalent)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	400 mA	400 mA	400 mA
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100A	100A	35A
Melting I²t	1.6	1.65	0.81
DC Cold Resistance (Ohms)	1.4	1.45	0.82
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, UL	CE, CSA, cULus	CCC, CE, CSA, cULus, IMQ, SEMKO, VDE

Engineering Selection Recommendations

The 5TTP 400-R is the primary recommended substitute for the obsolete 5TTP 400. Both parts share identical electrical and mechanical specifications with matching breaking capacity (100A) and melting I²t (1.65 vs. 1.6). The 5TTP 400-R offers improved compliance status with ROHS3 certification and cULus approval, supporting modern procurement and regulatory requirements.

The 5STP 400-R serves as an alternative parametric equivalent when breaking capacity and melting I²t characteristics are not critical design constraints. This part provides the broadest certification coverage (CCC, CE, CSA, cULus, IMQ, SEMKO, VDE) and ROHS3 compliance. However, the reduced breaking capacity (35A vs. 100A) and lower melting I²t (0.81 vs. 1.6) require circuit-level evaluation to confirm suitability for the intended application.

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 400-R be used as a direct replacement for the 5TTP 400?

A: Yes. The 5TTP 400-R maintains identical current rating (400 mA), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package dimensions (5mm x 20mm axial), and mounting type (through hole). Breaking capacity and melting I²t are also equivalent, supporting direct substitution in existing designs.

Q: What are the key differences between the 5TTP 400-R and 5STP 400-R?

A: Both parts maintain identical electrical ratings (400 mA, 250 V AC) and mechanical form factor (5mm x 20mm axial). The primary differences are breaking capacity (100A for 5TTP 400-R vs. 35A for 5STP 400-R) and melting I²t (1.65 vs. 0.81). The 5STP 400-R also offers broader international certification coverage. Selection depends on circuit requirements for breaking capacity and thermal response characteristics.

Q: Are there packaging differences between these substitutes?

A: The 5TTP 400 was supplied in standard packaging. Both the 5TTP 400-R and 5STP 400-R are available in bulk packaging. No form factor or mechanical compatibility issues exist between these parts.

Q: Which substitute offers the best compliance status?

A: The 5STP 400-R provides the broadest certification coverage (CCC, CE, CSA, cULus, IMQ, SEMKO, VDE) and ROHS3 compliance. The 5TTP 400-R offers CE, CSA, and cULus certifications with ROHS3 compliance. Both exceed the original 5TTP 400 compliance profile (CE, CSA, UL; RoHS non-compliant).

Q: Can the 5STP 400-R be used in applications requiring 100A breaking capacity?

A: No. The 5STP 400-R has a breaking capacity of 35A, which is insufficient for applications designed around the 100A specification of the 5TTP 400. Circuit-level analysis is required to determine if the lower breaking capacity is acceptable for the specific application.

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