Littelfuse 1980100000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 1980100000 is a 100 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a holder for installation and is approved by CSA and UL standards. Substitute parts maintain the same electrical ratings and mechanical dimensions while offering active product status and expanded certification coverage.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Current Rating: 100 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in breaking capacity, melting I²t, DC cold resistance, and operating temperature ranges are permitted within the scope of substitution, as these parameters do not affect basic functional compatibility in holder-based installations.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage AC (V)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
1980100000	Littelfuse	198	100	250	Slow Blow	5x20mm	35	0.038	Obsolete	ROHS3 Compliant
0239.100MXP	Littelfuse	239	100	250	Slow Blow	5x20mm	35	0.055	Active	ROHS3 Compliant
0218.100HXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.0482	Active	ROHS3 Compliant
0218.100MXF4P	Littelfuse	218	100	250	Slow Blow	5x20mm	80	341.5	Active	ROHS3 Compliant
0218.100MXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.0482	Active	ROHS3 Compliant
0218.100TXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.079	Active	ROHS3 Compliant
0218.100VXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.079	Active	ROHS3 Compliant
0219.100MXAP	Littelfuse	219XA	100	250	Slow Blow	5x20mm	150	0.079	Active	ROHS3 Compliant
0034.3107	SCHURTER	FST 5x20	100	250	Slow Blow	5x20mm	35	0.107	Active	ROHS3 Compliant
0034.3762	SCHURTER	FSL 5x20	100	250	Slow Blow	5x20mm	35	0.128	Active	ROHS3 Compliant
0034.5033	SCHURTER	FTT 5x20	100	250	Slow Blow	5x20mm	35	0.14	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, addressing the obsolete status of the 1980100000. Selection among substitutes should be based on certification requirements and supply availability:

Littelfuse 0218.100MXP offers the widest certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) with 10,490 units in stock, making it the primary choice for applications requiring multi-regional compliance.

Littelfuse 0218.100HXP provides equivalent certifications with slightly lower inventory (787 units) and is suitable where specific approval agency requirements align.

Littelfuse 0219.100MXAP features elevated breaking capacity (150A) and is appropriate for applications requiring higher fault current withstand capability.

SCHURTER 0034.3107 (FST series) and 0034.3762 (FSL series) provide alternative manufacturer options with active status and appropriate certifications for regional markets.

SCHURTER 0034.5033 (FTT series) includes dual voltage rating (250V AC / 125V DC) for applications requiring DC voltage protection.

Frequently Asked Questions (FAQ)

Q: Can I use any substitute part listed in the parameter comparison table?

A: Yes. All listed parts meet the core electrical and mechanical requirements: 100 mA current rating, 250 V AC voltage rating, slow-blow response, 5mm x 20mm package, and cartridge glass type requiring a holder. Differences in breaking capacity and melting I²t do not affect compatibility in standard holder installations.

Q: What is the difference between Littelfuse and SCHURTER substitutes?

A: Both manufacturers provide equivalent electrical and mechanical performance. Selection depends on regional certification requirements, supply chain preferences, and approval agency approvals specified in your application standards.

Q: Does the melting I²t value affect substitution compatibility?

A: Melting I²t variations among substitutes reflect different thermal response characteristics but do not prevent functional substitution in holder-based circuits. The fuse will still operate at the specified 100 mA current rating and 250 V voltage rating.

Q: Can I substitute the 0218.100MXF4P with higher breaking capacity?

A: Yes. The 0218.100MXF4P (80A breaking capacity) is a valid substitute. Higher breaking capacity provides additional fault current withstand margin and does not compromise circuit protection at the 100 mA rating.

Q: Is the SCHURTER 0034.5033 suitable if my circuit uses DC voltage?

A: The 0034.5033 is rated for 250V AC and 125V DC, making it suitable for dual-voltage applications. Other substitutes are rated for AC/DC operation at 250V but do not specify separate DC voltage ratings.

Q: What certifications should I verify for my application?

A: Verify that the selected substitute part carries approvals required by your regional standards and end-use application. The 0218.100MXP offers the broadest certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE).

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