Littelfuse 23012500021 Ceramic Fuse 2.5A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 23012500021 is an active ceramic cartridge fuse rated for 2.5A at 250VAC with fast-blow response characteristics. It is designed for applications requiring overcurrent protection in AC/DC circuits and operates within the -25°C to 70°C temperature range. The fuse requires a holder for installation and is housed in a 5mm x 20mm form factor. This part is currently in active production status with 803 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and functional characteristics align with the original specification.

Substiute Parts

23012500021

Littelfuse Inc.In Stock: 82023012500021 Datasheet

Current PartRFQ

0034.0905

SCHURTER Inc.In Stock: 12100034.0905 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 23012500021 are qualified based on the following mandatory electrical and mechanical parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)

The SCHURTER Inc. 0034.0905 meets all substitution criteria. Both parts share identical electrical ratings, ceramic construction, fast-blow characteristics, and 5x20mm mechanical form factor. Dimensional tolerances remain within acceptable limits for holder compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 23012500021 and SCHURTER 0034.0905 are active production parts with equivalent electrical and mechanical specifications. Selection between these parts should be based on the following factors:

The SCHURTER 0034.0905 offers ROHS3 compliance, which is required for applications subject to RoHS regulations. The Littelfuse 23012500021 is RoHS non-compliant and should be selected only for applications where RoHS compliance is not mandated.

The SCHURTER part provides a higher breaking capacity (1.5 kA versus 1 kA) and extended operating temperature range (-40°C to 85°C versus -25°C to 70°C), offering greater performance margins in demanding environments.

Both parts are mechanically compatible with standard 5x20mm fuse holders. Dimensional differences (5.20mm versus 5.10mm diameter) remain within typical holder tolerances.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 0034.0905 directly replace the Littelfuse 23012500021?

A: Yes. Both parts share identical current rating (2.5A), voltage rating (250VAC), fuse type (ceramic cartridge), response time (fast-blow), and mechanical form factor (5x20mm). They are mechanically and electrically interchangeable in standard fuse holders.

Q: What are the key differences between these two parts?

A: The SCHURTER part provides higher breaking capacity (1.5 kA versus 1 kA), extended operating temperature range (-40°C to 85°C versus -25°C to 70°C), ROHS3 compliance, and higher melting I²t value (1.06 versus 0.44). The Littelfuse part is RoHS non-compliant.

Q: Are there dimensional compatibility concerns?

A: Diameter tolerance is minimal (5.20mm versus 5.10mm). Both parts fit standard 5x20mm fuse holders. Length is identical at 0.787" (20.00mm) for both parts.

Q: Which part should be selected for RoHS-regulated applications?

A: The SCHURTER 0034.0905 is ROHS3 compliant and must be used for applications subject to RoHS directives. The Littelfuse 23012500021 is not RoHS compliant.

Q: Do these parts require different holders?

A: No. Both parts are designed for standard 5x20mm fuse holders and do not require different mounting hardware.