Littelfuse 0219.400M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0219.400M is a 400 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor, designed for applications requiring circuit protection with controlled response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility. Substitute parts must preserve the 400 mA current rating, 250 V voltage rating, slow-blow response time, and 5mm x 20mm package dimensions to ensure direct functional replacement.

Key Parameters

Parameter	Value
Manufacturer Part Number	0219.400M
Manufacturer	Littelfuse Inc.
Current Rating	400 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Product Status	Obsolete
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitute parts are qualified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Current Rating: 400 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 125°C (all substitutes maintain this range)
DC Cold Resistance: 0.535 Ohms (consistent across all alternatives)

All identified substitute parts meet these criteria. Differences in breaking capacity, melting I²t values, and approval agency certifications do not affect functional substitution for standard circuit protection applications, as these parameters are application-specific and determined by system design requirements.

Parameter Comparison

Part Number	Series	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	Product Status	RoHS Status
0219.400M	219	400 mA	250 V	Slow Blow	5mm x 20mm	150A	1.35	Obsolete	Non-compliant
0213.400MXBP	213	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.36	Active	ROHS3 Compliant
0213.400MXP	213	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.36	Active	ROHS3 Compliant
0213.400TXP	213	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.36	Active	ROHS3 Compliant
0218.400HXP	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	Active	ROHS3 Compliant
0218.400MXBP	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	Active	ROHS3 Compliant
0218.400MXP	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	Active	ROHS3 Compliant
0218.400TXP	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	Active	ROHS3 Compliant
0218.400VXP	218	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.325	Active	ROHS3 Compliant
0219.400MXABP	219XA	400 mA	250 V	Slow Blow	5mm x 20mm	150A	1.4	Active	ROHS3 Compliant
0219.400MXAP	219XA	400 mA	250 V	Slow Blow	5mm x 20mm	150A	1.4	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The 0219.400MXABP and 0219.400MXAP represent the most direct functional equivalents, maintaining the same series lineage (219XA evolution of 219), identical breaking capacity (150A), and active product status. Both are ROHS3 compliant and carry UL, CSA, and CE certifications. These parts are preferred when design specifications explicitly require 150A breaking capacity or when maintaining series consistency is a design requirement.

Secondary Substitutes (Functional Equivalents):

The 0213 series (0213.400MXBP, 0213.400MXP, 0213.400TXP) and 0218 series (0218.400HXP, 0218.400MXBP, 0218.400MXP, 0218.400TXP, 0218.400VXP) provide full electrical and mechanical compatibility with reduced breaking capacity (35A). These are suitable for applications where breaking capacity requirements do not exceed 35A. All are active products with ROHS3 compliance and comprehensive international certifications (CCC, CE, CSA, SEMKO, UL, VDE).

Compliance Considerations:

The original 0219.400M is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for new equipment designs and procurement. Certification coverage varies by series; verify specific approval agencies (UL, CSA, CCC, VDE, SEMKO, KC, K-MARK) against application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 0218 series fuse as a direct replacement for the 0219.400M?

A: Yes. The 0218 series maintains all critical electrical parameters: 400 mA current rating, 250 V voltage rating, slow-blow response, and 5mm x 20mm package. The primary difference is breaking capacity (35A versus 150A). If your application requires 150A breaking capacity, use the 0219.400MXABP or 0219.400MXAP instead.

Q: What is the difference between the 0213 and 0218 series?

A: Both series are functionally equivalent for the 400 mA, 250 V slow-blow specification. Differences lie in approval agency certifications and internal design characteristics. The 0218 series includes K-MARK and KC certifications; the 0213 series does not. Select based on your regional certification requirements.

Q: Why do some substitutes have different melting I²t values?

A: Melting I²t (1.325 to 1.4) represents the thermal energy required to melt the fuse element. These minor variations reflect design differences between series but do not affect functional substitution for standard circuit protection. Application-specific thermal analysis may be required for critical designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance status. The original 0219.400M is RoHS non-compliant. For new equipment designs subject to environmental regulations, use any of the listed substitutes.

Q: Can I mix different substitute part numbers in the same equipment?

A: Yes, provided all parts meet your application's electrical and mechanical requirements. However, for consistency and supply chain management, standardizing on a single part number is recommended.

Q: What does "Requires Holder" mean?

A: This fuse type is a cartridge that must be installed in a dedicated fuse holder. It is not a plug-in fuse. Ensure your equipment has the appropriate 5mm x 20mm fuse holder before substitution.

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