Littelfuse 021701.6MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021701.6MXP is a 1.6 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This component is active in production and widely used in circuit protection applications requiring fast response characteristics. Equivalent and substitute parts are identified when inventory constraints, supply chain disruptions, or design flexibility requirements necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these mandatory criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agency certifications are documented but do not disqualify substitution when primary electrical and mechanical parameters align.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
021701.6MXP	Littelfuse Inc.	217	1.6	250	Fast Blow	5x20mm	35	4.615	0.0528	50040
021701.6HXP	Littelfuse Inc.	217	1.6	250	Fast Blow	5x20mm	35	4.615	0.0528	2061
021701.6TXP	Littelfuse Inc.	217	1.6	250	Fast Blow	5x20mm	35	4.615	0.0528	1308
021701.6VXP	Littelfuse Inc.	217	1.6	250	Fast Blow	5x20mm	35	4.615	0.0528	721
023501.6HXP	Littelfuse	235	1.6	250	Fast Blow	5x20mm	100	2.025	0.0758	1206
023501.6MXP	Littelfuse	235	1.6	250	Fast Blow	5x20mm	100	2.025	0.0758	1315
061701.6MXP	Littelfuse Inc.	617	1.6	250	Fast Blow	5x20mm	35	4.615	0.0528	2654
0034.1518	SCHURTER Inc.	FSF 5x20	1.6	250	Fast Blow	5x20mm	35	2.94	Not Specified	1954
5SF 1.6-R	Bel Fuse Inc.	5SF	1.6	250	Fast Blow	5x20mm	35	4.0	0.05	2087
BK/S500-1.6-R	Eaton - Electronics Division	S500	1.6	250	Fast Blow	5x20mm	35	1.6	0.066	749
FSD-1.6A	OptiFuse	FSD	1.6	250	Fast Blow	5x20mm	35	3.2	Not Specified	1232

Engineering Selection Recommendations

Littelfuse Series 217 (021701.6MXP, 021701.6HXP, 021701.6TXP, 021701.6VXP): Direct equivalents within the same manufacturer and series. All variants carry identical electrical specifications and approval certifications (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE). Selection among these parts is based on inventory availability and internal sourcing preferences.

Littelfuse Series 235 (023501.6HXP, 023501.6MXP): Parametric equivalents with higher breaking capacity (100 A vs. 35 A) and lower melting I²t (2.025 vs. 4.615). These parts are suitable for applications where enhanced breaking capacity is beneficial or where circuit protection requirements permit the lower thermal energy characteristic. Approval certifications are reduced (CE, CSA, KC, PSE, UL) compared to Series 217.

Littelfuse Series 617 (061701.6MXP): Parametric equivalent with identical electrical performance to Series 217 but reduced approval certifications (CCC, CE, CSA, UR, VDE). Suitable for applications where the specified certifications are sufficient.

Cross-Manufacturer Alternatives (SCHURTER 0034.1518, Bel Fuse 5SF 1.6-R, Eaton BK/S500-1.6-R, OptiFuse FSD-1.6A): All meet primary electrical and mechanical requirements. Selection depends on approval agency requirements specific to the end application. SCHURTER and Bel Fuse parts carry comprehensive certifications (CCC, CE, CSA, cURus, VDE). Eaton S500 series includes BSI certification. OptiFuse FSD series carries cURus and IEC 60127 certifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute 021701.6MXP with 023501.6HXP?

A: Yes. Both parts meet the mandatory electrical and mechanical criteria (1.6 A, 250 V AC, fast-blow, 5x20mm cartridge). The 023501.6HXP offers higher breaking capacity (100 A) and lower melting I²t (2.025). Verify that the reduced approval certifications (CE, CSA, KC, PSE, UL vs. CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE) satisfy your application requirements.

Q: What is the difference between Littelfuse Series 217 and Series 235?

A: Series 217 and Series 235 are electrically equivalent at 1.6 A, 250 V AC, fast-blow. Series 235 provides higher breaking capacity (100 A vs. 35 A) and lower melting I²t (2.025 vs. 4.615). Series 217 carries more comprehensive approval certifications. Selection depends on breaking capacity requirements and certification needs.

Q: Are cross-manufacturer parts (SCHURTER, Bel Fuse, Eaton, OptiFuse) direct replacements?

A: Yes, all listed cross-manufacturer parts meet the mandatory electrical and mechanical specifications. Verify that the specific approval certifications (CCC, CE, CSA, UL, VDE, etc.) match your application requirements before substitution.

Q: Does the 5x20mm package dimension vary between manufacturers?

A: Nominal package dimensions are 5mm x 20mm across all listed parts. Minor dimensional variations exist (e.g., 5SF 1.6-R is specified as 0.201" Dia x 0.787" L vs. standard 0.205" Dia x 0.787" L). These variations are within mechanical tolerance and do not affect holder compatibility.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values (e.g., 1.6 for Eaton S500) indicate faster thermal response; higher values (e.g., 4.615 for Littelfuse 217) indicate slower thermal response. Both are fast-blow fuses. Selection depends on circuit protection requirements and coordination with other protective devices.

Q: Which substitute part has the best inventory availability?

A: Littelfuse 021701.6MXP (main part) has the highest inventory at 50,040 pieces. Among substitutes, Littelfuse 061701.6MXP (2,654 pcs) and Bel Fuse 5SF 1.6-R (2,087 pcs) offer substantial availability.

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