5HF 3.15 Ceramic Fuse Cartridge Equivalent & Substitute Parts

Part Overview

The 5HF 3.15 is a 3.15 A, 250 V AC/DC ceramic fuse cartridge in 5mm x 20mm form factor manufactured by Bel Fuse Inc. This part is classified as obsolete, though functionally equivalent active alternatives are available from the same manufacturer and other qualified suppliers. Substitution is necessary to ensure continued supply chain access and to leverage active product status with enhanced compliance certifications.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 3.15 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity: 1.5 kA (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent (Bel Fuse Inc.): 5HFP 3.15-R and 5HF 3.15-R maintain identical electrical and mechanical specifications with active product status and enhanced RoHS3 compliance.

Cross-Manufacturer Equivalents (Littelfuse Inc., Eaton - Electronics Division): Parts from the 216 series (Littelfuse) and GDA/S501 series (Eaton) meet all core electrical and mechanical parameters. Dimensional tolerances and melting I²t values vary within acceptable ranges for the application category.

Parameter Comparison

Parameter	5HF 3.15	5HFP 3.15-R	5HF 3.15-R	02163.15HXP	02163.15MXBP	02163.15MXEP	02163.15MXP	02163.15TXP	02163.15VXP	GDA-3.15A	S501-3.15-R
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Eaton - Electronics Division
Current Rating (A)	3.15	3.15	3.15	3.15	3.15	3.15	3.15	3.15	3.15	3.15	3.15
Voltage Rating - AC (V)	250	250	250	250	250	250	250	250	250	250	250
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Package / Case	5mm x 20mm	5mm x 20mm (Axial)	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm (Axial)	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Breaking Capacity @ Rated Voltage (kA)	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Requires Holder	Through Hole	Requires Holder	Requires Holder	Requires Holder	Through Hole	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Melting I²t	12.2	12	12	6.7	6.7	6.7	6.7	6.7	6.7	8.1	8.1
DC Cold Resistance (Ohms)	0.031	0.031	0.031	0.0368	0.0368	0.0368	0.0368	0.0368	0.0368	0.037	0.037
Size / Dimension (Dia x L)	0.201" x 0.787" (5.10mm x 20.00mm)	0.217" x 0.827" (5.50mm x 21.00mm)	0.201" x 0.787" (5.10mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.228" x 0.886" (5.80mm x 22.50mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)	0.205" x 0.787" (5.20mm x 20.00mm)

Engineering Selection Recommendations

Primary Recommendation: 5HF 3.15-R (Bel Fuse Inc.)

This part is the parametric equivalent of the obsolete 5HF 3.15. It maintains identical electrical specifications, mounting requirements, and dimensional tolerances. Product status is active with ROHS3 compliance. Approval agencies include CCC, CE, CSA, cURus, IMQ, PSE, SEMKO, and VDE. This selection eliminates supply chain risk while preserving design compatibility.

Secondary Recommendation: 5HFP 3.15-R (Bel Fuse Inc.)

This part differs only in mounting type (Through Hole vs. Requires Holder) and dimensional envelope. Select this variant only if PCB design accommodates axial lead mounting. Electrical specifications and compliance certifications are equivalent to 5HF 3.15-R.

Cross-Manufacturer Alternatives: Littelfuse 216 Series (02163.15HXP, 02163.15MXBP, 02163.15MXEP, 02163.15MXP, 02163.15TXP, 02163.15VXP)

These parts meet all core electrical and mechanical requirements. Melting I²t values (6.7) are lower than the original part (12.2), indicating faster thermal response. DC cold resistance is marginally higher (0.0368 Ohms vs. 0.031 Ohms). Approval agencies include CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. Select based on mounting type requirement and dimensional fit within holder or PCB footprint.

Cross-Manufacturer Alternatives: Eaton GDA-3.15A and S501-3.15-R

Both parts meet electrical specifications with melting I²t of 8.1 and DC cold resistance of 0.037 Ohms. GDA-3.15A certifications include CCC, CSA, IMQ, SEMKO, and UR. S501-3.15-R certifications include BSI, CCC, CSA, cURus, IMQ, MITI/JET, SEMKO, and VDE. S501-3.15-R offers ROHS3 compliance; GDA-3.15A compliance status is not specified.

Frequently Asked Questions (FAQ)

Q: Can I substitute 5HF 3.15 with 5HFP 3.15-R?

A: Yes, electrically and mechanically. The primary difference is mounting type: 5HFP 3.15-R uses through-hole (axial) mounting, while 5HF 3.15 requires a separate holder. Verify PCB design accommodates the axial lead configuration and dimensional envelope (0.217" diameter x 0.827" length).

Q: Why do Littelfuse 216 series parts have lower melting I²t values?

A: Melting I²t is a thermal characteristic that reflects the energy required to melt the fuse element. Lower values indicate faster thermal response. All parts listed meet the 1.5 kA breaking capacity requirement at 250 V. Application-specific thermal analysis determines acceptability.

Q: Are dimensional differences between parts critical?

A: Yes. The original 5HF 3.15 measures 0.201" diameter x 0.787" length. Littelfuse parts measure 0.205" diameter x 0.787" length, and 5HFP 3.15-R measures 0.217" diameter x 0.827" length. Verify holder or PCB footprint tolerances before selection. Through-hole variants (5HFP 3.15-R, 02163.15MXEP) have larger envelopes.

Q: Which substitute offers the best compliance coverage?

A: S501-3.15-R (Eaton) provides the broadest certification scope: BSI, CCC, CSA, cURus, IMQ, MITI/JET, SEMKO, and VDE, with ROHS3 compliance. 5HF 3.15-R (Bel Fuse Inc.) provides CCC, CE, CSA, cURus, IMQ, PSE, SEMKO, and VDE certifications with ROHS3 compliance.

Q: Can I use parts with different DC cold resistance values interchangeably?

A: DC cold resistance affects circuit behavior under normal operation. The original part is 0.031 Ohms. Littelfuse and Eaton alternatives range from 0.0368 to 0.037 Ohms. Verify circuit design tolerates the resistance variation, particularly in low-voltage or high-current applications where voltage drop across the fuse becomes significant.

Q: What is the difference between "Requires Holder" and "Through Hole" mounting?

A: "Requires Holder" parts mount in a separate fuse holder assembly. "Through Hole" (axial) parts mount directly to PCB pads with leads. Design compatibility depends on existing mechanical and electrical infrastructure. Conversion between mounting types requires design modification.

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