Littelfuse 021306.3TXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 021306.3TXP is a 6.3 A, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package format. This component is designed for applications requiring overcurrent protection in industrial, consumer, and commercial equipment. The part is currently active in production with 1,069 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design optimization across compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	021306.3TXP
Manufacturer	Littelfuse Inc.
Series	213
Fuse Type	Cartridge, Glass
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	63 A
Melting I²t	600
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0095 Ohms
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 021306.3TXP are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following core parameters:

Current Rating: 6.3 A
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder
Fuse Type: Cartridge, Glass
Operating Temperature Range: -55°C to 125°C
RoHS Status: ROHS3 Compliant

Substitutes are differentiated by secondary parameters including series designation, breaking capacity, melting I²t, DC cold resistance, and approval agency certifications. These variations allow selection based on specific application requirements, regulatory compliance needs, and supply availability.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)	Product Status
021306.3TXP	Littelfuse Inc.	213	6.3	250	63	600	0.0095	1,069	Active
021306.3MXP	Littelfuse Inc.	213	6.3	250	63	600	0.0095	1,719	Active
021806.3HXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1,600	Active
021806.3MXBP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1,768	Active
021806.3MXF34P	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1,499	Active
021806.3MXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	2,743	Active
021806.3TXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	990	Active
021906.3MXABP	Littelfuse Inc.	219XA	6.3	250	150	1093.035	0.0117	1,551	Active
021906.3MXAP	Littelfuse Inc.	219XA	6.3	250	150	1093.035	0.0117	1,561	Active
061806.3MXP	Littelfuse Inc.	618	6.3	250	63	198.5	0.0076	1,753	Active
0034.3125	SCHURTER Inc.	FST 5x20	6.3	250	63	190	Not Specified	59,595	Active

Engineering Selection Recommendations

Selection among equivalent and substitute parts should be based on the following engineering criteria:

Series 213 (021306.3TXP, 021306.3MXP): These parts share identical electrical and thermal characteristics with melting I²t of 600 and DC cold resistance of 0.0095 Ohms. Both maintain full compliance with BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications. Selection between these two is based on packaging designation and inventory availability.

Series 218 (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP): These parts feature reduced melting I²t (198.5) and lower DC cold resistance (0.0076 Ohms) compared to Series 213. Certification coverage includes CCC, CE, CSA, PSE, SEMKO, UL, and VDE, with some variants including K-MARK or KC approval. These parts are suitable for applications where lower thermal mass and reduced resistance are advantageous.

Series 219XA (021906.3MXABP, 021906.3MXAP): These parts provide enhanced breaking capacity (150 A versus 63 A) and significantly higher melting I²t (1093.035). DC cold resistance is 0.0117 Ohms. These variants are appropriate for high-fault-current environments requiring superior arc suppression and breaking performance. Certifications include CCC, CE, CSA, PSE, SEMKO, and UL.

Series 618 (061806.3MXP): This Littelfuse variant offers melting I²t of 198.5 and DC cold resistance of 0.0076 Ohms, comparable to Series 218. Certifications include CCC, CE, CSA, UR, and VDE. This part is suitable for applications with moderate fault current requirements.

SCHURTER 0034.3125: This cross-manufacturer substitute from SCHURTER Inc. maintains the 6.3 A, 250 V AC/DC specification with 5mm x 20mm package format. Melting I²t is 190 and certifications include CCC, cURus, PSE/JET, and VDE. Extensive inventory availability (59,595 units) supports high-volume procurement. This part is suitable for applications where multi-source qualification is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute 021306.3TXP with any of the listed alternatives?

A: Yes, all listed parts maintain the core electrical specifications (6.3 A, 250 V AC/DC, slow-blow response, 5mm x 20mm package). Selection depends on application-specific requirements for breaking capacity, thermal characteristics, and regulatory certifications.

Q: What is the difference between Series 213 and Series 218?

A: Series 213 (021306.3TXP, 021306.3MXP) has melting I²t of 600 and DC cold resistance of 0.0095 Ohms. Series 218 variants have melting I²t of 198.5 and DC cold resistance of 0.0076 Ohms. Series 218 provides lower thermal mass and reduced resistance, suitable for applications with different thermal management requirements.

Q: When should I use Series 219XA parts?

A: Series 219XA (021906.3MXABP, 021906.3MXAP) should be selected for high-fault-current applications. These parts feature breaking capacity of 150 A and melting I²t of 1093.035, providing superior arc suppression compared to 63 A breaking capacity alternatives.

Q: Is the SCHURTER 0034.3125 fully compatible with Littelfuse parts?

A: The SCHURTER 0034.3125 maintains electrical and mechanical compatibility with all listed Littelfuse alternatives. It shares the 6.3 A, 250 V AC/DC rating and 5mm x 20mm package format. Certification differences (cURus, PSE/JET versus UL, K-MARK) should be verified against application requirements.

Q: What certifications are critical for my application?

A: Certification requirements depend on end-use geography and industry standards. All listed parts maintain ROHS3 compliance and VDE certification. Verify specific requirements for CCC (China), UL (North America), K-MARK (Korea), PSE (Japan), and other regional certifications applicable to your target market.

Q: Does DC cold resistance affect fuse selection?

A: DC cold resistance influences circuit behavior during normal operation and affects voltage drop across the fuse. Series 213 parts (0.0095 Ohms) have higher resistance than Series 218 and 618 variants (0.0076 Ohms). Series 219XA parts have the highest resistance (0.0117 Ohms). Select based on circuit design requirements and acceptable voltage drop specifications.

Q: What is melting I²t and why does it vary?

A: Melting I²t is the thermal energy required to melt the fuse element, expressed as amperes squared times seconds. Higher values indicate slower thermal response. Series 213 (600) responds more slowly than Series 218 (198.5), while Series 219XA (1093.035) provides the slowest response. Match melting I²t to application inrush current characteristics and protection requirements.

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