Littelfuse 0254.600M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0254.600M is a 500 mA board mount axial fuse rated for 125 V AC/DC operation. This component belongs to the PICO® II 253 series and is designed for through-hole PCB mounting applications requiring fast-blow protection. The part maintains active product status with full RoHS3 compliance and international approvals (CSA, PSE, TUV, UR). Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory optimization, or manufacturer preference while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0254.600M are classified based on electrical parameter equivalence and mechanical compatibility:

Parametric Equivalent (0254.600V): Identical electrical specifications including 500 mA current rating, 125 V AC/DC voltage rating, fast-blow response, and axial package configuration. Manufactured by Littelfuse Inc. within the same PICO® II 253 series. Differs only in packaging designation (bulk inventory variant).

Direct Manufacturer Substitute (7010.6340.13): SCHURTER Inc. part matching core electrical parameters: 500 mA current rating, 125 V AC/DC voltage rating, and fast-blow response. Mechanical differences include cartridge non-standard (axial) package format and slightly different physical dimensions. Operating temperature range limited to -55°C ~ 85°C. Breaking capacity specified at 300A versus dual ratings (50A AC, 300A DC) for Littelfuse variants.

Parameter Comparison

Parameter	0254.600M (Main)	0254.600V (Parametric Equivalent)	7010.6340.13 (Direct Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Current Rating	500 mA	500 mA	500 mA
Voltage Rating (AC)	125 V	125 V	125 V
Voltage Rating (DC)	125 V	125 V	125 V
Response Time	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Cartridge, Non-Standard (Axial)
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 85°C
Breaking Capacity @ Rated Voltage	50A AC, 300A DC	50A AC, 300A DC	300A
Melting I²t	0.0598	0.0598	0.1
DC Cold Resistance	0.28 Ohms	0.28 Ohms	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

0254.600V Selection: Use this parametric equivalent when Littelfuse PICO® II 253 series continuity is required and inventory sourcing from alternative packaging batches is acceptable. Electrical and thermal performance are identical to the 0254.600M. All regulatory approvals (CSA, PSE, TUV, UR) and RoHS3 compliance are maintained.

7010.6340.13 Selection: Use this SCHURTER substitute when cross-manufacturer sourcing is necessary and the application operating temperature does not exceed 85°C. The reduced upper temperature limit (-55°C ~ 85°C versus -55°C ~ 125°C) must be verified against circuit thermal requirements. The higher melting I²t value (0.1 versus 0.0598) indicates slightly different thermal response characteristics. Physical dimensions differ marginally (0.093" Dia x 0.315" L versus 0.103" Dia x 0.280" L), requiring PCB footprint verification. RoHS3 compliance is maintained.

All substitute parts carry active product status and meet the core electrical requirements of 500 mA at 125 V AC/DC with fast-blow response.

Frequently Asked Questions (FAQ)

Q: Can 0254.600V be used as a direct replacement for 0254.600M? A: Yes. Both parts are manufactured by Littelfuse within the PICO® II 253 series with identical electrical specifications, voltage ratings, current ratings, response time, and operating temperature range. The parts differ only in packaging designation.

Q: What are the limitations of using 7010.6340.13 as a substitute? A: The SCHURTER 7010.6340.13 has a reduced maximum operating temperature of 85°C compared to 125°C for Littelfuse variants. The melting I²t is higher (0.1 versus 0.0598), affecting thermal response. Physical dimensions are slightly different, requiring PCB footprint compatibility verification. Approval agencies are not specified for this part.

Q: Are all substitute parts RoHS3 compliant? A: Yes. Both 0254.600V and 7010.6340.13 are ROHS3 compliant and REACH unaffected, matching the compliance status of the 0254.600M.

Q: What is the significance of the melting I²t difference between 0254.600M and 7010.6340.13? A: Melting I²t (0.0598 versus 0.1) indicates the thermal energy required to melt the fuse element. The higher value for the SCHURTER part means it requires more thermal energy to operate, resulting in slightly different response characteristics under fault conditions. Circuit protection timing must be evaluated for the specific application.

Q: Can the 7010.6340.13 be used in applications requiring the full -55°C ~ 125°C temperature range? A: No. The SCHURTER part is rated only to 85°C maximum. Applications requiring operation above 85°C must use the Littelfuse 0254.600M or 0254.600V.

Q: Are there mechanical compatibility concerns with the 7010.6340.13 package? A: Yes. The 7010.6340.13 uses a cartridge non-standard (axial) package with dimensions of 0.093" Dia x 0.315" L, compared to 0.103" Dia x 0.280" L for the Littelfuse axial package. PCB footprint, lead spacing, and mounting hole dimensions must be verified before substitution.

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