Littelfuse 021702.5TXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021702.5TXP is a 2.5 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This component is Active status and widely used in circuit protection applications requiring reliable overcurrent interruption. Alternative equivalent parts may be necessary due to inventory availability, regional certification requirements, or specific application performance characteristics such as breaking capacity or melting I²t values.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following parameters: current rating (2.5 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical package (5mm x 20mm). Parts are grouped into three categories based on substitution relationship type:

Parametric Equivalents (Series 217 & 235): Parts 021702.5HXP, 021702.5MXP, 023502.5HXP, and 023502.5MXP share identical electrical ratings and physical dimensions. These differ only in internal construction characteristics (melting I²t, breaking capacity, approval agencies) while maintaining full functional compatibility.

Cross-Manufacturer Direct Equivalent (SCHURTER): Part 0034.1520 from SCHURTER Inc. meets all core electrical and mechanical specifications with identical current, voltage, package, and response time characteristics.

Manufacturer-Recommended Alternatives (Bel Fuse & Eaton): Parts 5MF 2.5-R, 5SF 2.5-R, BK/GDB-2.5A, and BK/GMA-2.5-R are functionally equivalent across all critical parameters. These parts may exhibit variations in breaking capacity, melting I²t, or approval certifications but maintain compatibility within the specified electrical and mechanical envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	RoHS Status
021702.5TXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35	9.46	0.0334	ROHS3
021702.5HXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35	9.46	0.0334	ROHS3
021702.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35	9.46	0.0334	ROHS3
023502.5HXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	100	5.445	0.0437	ROHS3
023502.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	100	5.445	0.0437	ROHS3
061702.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35	9.46	0.0334	ROHS3
0034.1520	SCHURTER Inc.	2.5	250	5x20mm	Fast Blow	35	9.19	—	ROHS3
5MF 2.5-R	Bel Fuse Inc.	2.5	250	5x20mm	Fast Blow	200	7.6	0.037	ROHS3
5SF 2.5-R	Bel Fuse Inc.	2.5	250	5x20mm	Fast Blow	35	10	0.026	ROHS3
BK/GDB-2.5A	Eaton - Electronics Division	2.5	250	5x20mm	Fast Blow	35	6.1	0.034	RoHS Compliant
BK/GMA-2.5-R	Eaton - Electronics Division	2.5	250	5x20mm	Fast Blow	100	4.9	0.046	ROHS3

Engineering Selection Recommendations

Littelfuse Series 217 (021702.5HXP, 021702.5MXP): Direct parametric equivalents with identical electrical characteristics and breaking capacity. Recommended for applications requiring full compatibility with the original 021702.5TXP specification. Certifications include BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE.

Littelfuse Series 235 (023502.5HXP, 023502.5MXP): Functionally equivalent with elevated breaking capacity (100 A vs. 35 A) and reduced melting I²t. Suitable for applications where higher fault current interruption capability is required. Certifications include CE, CSA, KC, PSE, and UL.

Littelfuse Series 617 (061702.5MXP): Parametric equivalent with identical electrical performance to Series 217. Certifications include CCC, CE, CSA, UR, and VDE.

SCHURTER 0034.1520: Cross-manufacturer equivalent with matching electrical and mechanical specifications. Melting I²t of 9.19 is within acceptable tolerance of the original 9.46. Certifications include CCC, cURus, PSE/JET, and VDE.

Bel Fuse 5MF 2.5-R: Functionally equivalent with significantly higher breaking capacity (200 A). Suitable for high-fault-current environments. Certifications include CE, CSA, cULus, and PSE.

Bel Fuse 5SF 2.5-R: Functionally equivalent with matching breaking capacity (35 A) and comprehensive certification coverage including CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE.

Eaton BK/GDB-2.5A: Functionally equivalent with lower melting I²t (6.1). Certifications include UL and VDE.

Eaton BK/GMA-2.5-R: Functionally equivalent with elevated breaking capacity (100 A) and reduced melting I²t (4.9). Certifications include CSA, PSE, and UL.

Frequently Asked Questions (FAQ)

Q: Can I substitute 021702.5HXP for 021702.5TXP? A: Yes. Both parts are Littelfuse Series 217 with identical current rating (2.5 A), voltage rating (250 V AC), package (5x20mm), response time (fast blow), and breaking capacity (35 A). They are parametric equivalents.

Q: What is the difference between Series 217 and Series 235 fuses? A: Series 235 parts (023502.5HXP, 023502.5MXP) have higher breaking capacity (100 A vs. 35 A) and lower melting I²t (5.445 vs. 9.46). Both maintain identical current and voltage ratings. Series 235 is suitable for applications with higher fault current levels.

Q: Can I use a Bel Fuse 5MF 2.5-R instead of the Littelfuse 021702.5TXP? A: Yes, functionally. The 5MF 2.5-R meets all core electrical specifications (2.5 A, 250 V AC, fast blow, 5x20mm package). It has higher breaking capacity (200 A) and different melting I²t (7.6 vs. 9.46). Certification coverage differs; verify that required certifications for your application are present.

Q: What does breaking capacity mean? A: Breaking capacity is the maximum fault current the fuse can safely interrupt at rated voltage without rupturing or creating a hazard. Higher breaking capacity indicates suitability for circuits with greater potential fault currents.

Q: Are all these fuses ROHS3 compliant? A: Most are ROHS3 compliant. Eaton BK/GDB-2.5A is listed as RoHS Compliant without specific version designation. Verify compliance requirements for your specific application.

Q: Do all substitute parts require the same holder? A: Yes. All parts listed are 5mm x 20mm cartridge fuses requiring a holder. Physical dimensions are identical across all substitutes.

Q: What is melting I²t and why does it vary? A: Melting I²t is a measure of the thermal energy required to melt the fuse element. Variations reflect differences in internal construction and material composition. Different melting I²t values result in different response characteristics under fault conditions.

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