Littelfuse 038801.5MXEP Glass Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 038801.5MXEP is a 1.5 A 250 V AC DC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 3AB, 3AG package format (1/4" x 1-1/4" axial). This part is classified as obsolete, making equivalent substitute parts necessary for ongoing circuit protection applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	1.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 038801.5MXEP are qualified based on strict electrical and mechanical parameter matching:

Qualifying Parameters for Substitution:

Current Rating: 1.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)

All three substitute parts—031801.5HXP, 031801.5MXP, and 031801.5VXP—meet these criteria and are direct functional equivalents.

Parameter Comparison

Parameter	038801.5MXEP (Main)	031801.5HXP	031801.5MXP	031801.5VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Series	388	318	318	318
Product Status	Obsolete	Active	Active	Active
Current Rating (Amps)	1.5 A	1.5 A	1.5 A	1.5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A	100 A
Melting I²t	2.68	2.35	2.35	2.35
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.0845 Ohms	0.1036 Ohms	0.1036 Ohms	0.1036 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, PSE	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Packaging	-	Bulk	Bulk	Bulk
Inventory Status	1035 Pcs New Original In Stock	1275 Pcs New Original In Stock	1726 Pcs New Original In Stock	1058 Pcs New Original In Stock

Engineering Selection Recommendations

All three substitute parts—031801.5HXP, 031801.5MXP, and 031801.5VXP—are active production components from Littelfuse Inc. Series 318 and provide direct functional equivalence to the obsolete 038801.5MXEP Series 388 part.

The substitute parts offer enhanced regulatory compliance with CE, CSA, PSE, and UL certifications compared to the original part's CE and PSE certifications. All substitute parts maintain ROHS3 compliance and identical electrical and mechanical specifications for circuit protection applications.

Selection among the three substitute parts may be based on packaging requirements (all available in bulk) and inventory availability. The DC cold resistance variance (0.1036 Ohms for substitutes versus 0.0845 Ohms for the original) and melting I²t difference (2.35 versus 2.68) are within acceptable tolerance for fast-blow glass cartridge fuse applications at the specified 1.5 A rating.

Frequently Asked Questions (FAQ)

Q: Can 031801.5HXP, 031801.5MXP, and 031801.5VXP be used interchangeably with 038801.5MXEP?

A: Yes. All three parts share identical current rating (1.5 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), package format (3AB, 3AG, 1/4" x 1-1/4" axial), mounting type (through hole), breaking capacity (100 A), operating temperature range (-55°C ~ 125°C), and physical dimensions (0.275" Dia x 1.288" L). They are direct functional equivalents.

Q: What is the difference between the main part and the substitute parts?

A: The primary differences are product status (038801.5MXEP is obsolete; substitutes are active), series designation (388 versus 318), regulatory certifications (substitutes include CSA and UL in addition to CE and PSE), and minor variations in DC cold resistance (0.0845 Ohms versus 0.1036 Ohms) and melting I²t (2.68 versus 2.35). These variations do not affect functional equivalence for circuit protection at the specified 1.5 A rating.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. The substitute parts maintain identical through-hole mounting, package dimensions, and electrical specifications. Direct board-level replacement is supported without circuit modification.

Q: Which substitute part should be selected?

A: Selection may be based on inventory availability and packaging preferences. All three substitute parts—031801.5HXP, 031801.5MXP, and 031801.5VXP—are functionally equivalent and available in bulk packaging with active production status.

Q: Do the substitute parts meet the same regulatory standards?

A: The substitute parts exceed the original part's regulatory compliance. While 038801.5MXEP carries CE and PSE certifications, all three substitute parts carry CE, CSA, PSE, and UL certifications, providing broader regulatory acceptance across markets.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message