Littelfuse 0456030.ERG Surface Mount Fuse – Equivalent & Substitute Parts

Part Overview

The Littelfuse 0456030.ERG is a 30 A, 125 V AC / 72 V DC surface mount board fuse in the NANO²® 456 series. This fast-blow fuse is designed for circuit protection in compact, high-density applications requiring SMD mounting. The part is actively manufactured and widely stocked, making it suitable for production environments. Identifying equivalent and substitute parts ensures design flexibility, supply chain continuity, and compatibility with alternative packaging or procurement channels.

Key Parameters

Parameter	Value
Current Rating	30 A
Voltage Rating – AC	125 V
Voltage Rating – DC	72 V
Response Time	Fast Blow
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	2-SMD, Square End Block
Breaking Capacity – AC	100 A
Breaking Capacity – DC	500 A
Melting I²t	81
DC Cold Resistance	0.00132 Ohms
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.398" L × 0.123" W × 0.123" H (10.10 mm × 3.12 mm × 3.12 mm)
RoHS Status	ROHS3 Compliant
Approval Agencies	cULus, PSE

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0456030.ERG is determined by strict equivalence across the following critical parameters:

Current Rating: 30 A (exact match required)
Voltage Ratings: 125 V AC and 72 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 2-SMD, Square End Block (exact match required)
Breaking Capacity: 100 A AC, 500 A DC (exact match required)
Melting I²t: 81 (exact match required)
DC Cold Resistance: 0.00132 Ohms (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Regulatory Compliance: cULus, PSE approval (exact match required)

The substitute part 0456030.ER meets all these criteria and differs only in packaging configuration (Cut Tape and Digi-Reel® versus the standard packaging of the main part). Both parts are manufactured by Littelfuse Inc. and belong to the NANO²® 456 series.

Parameter Comparison

Parameter	0456030.ERG (Main Part)	0456030.ER (Substitute)	Match Status
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Identical
Series	NANO²® 456	NANO²® 456	Identical
Current Rating (Amps)	30 A	30 A	Identical
Voltage Rating – AC	125 V	125 V	Identical
Voltage Rating – DC	72 V	72 V	Identical
Response Time	Fast Blow	Fast Blow	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Identical
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	Identical
Breaking Capacity @ Rated Voltage – AC	100 A	100 A	Identical
Breaking Capacity @ Rated Voltage – DC	500 A	500 A	Identical
Melting I²t	81	81	Identical
DC Cold Resistance	0.00132 Ohms	0.00132 Ohms	Identical
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	Identical
Size / Dimension	0.398" L × 0.123" W × 0.123" H (10.10 mm × 3.12 mm × 3.12 mm)	0.398" L × 0.123" W × 0.123" H (10.10 mm × 3.12 mm × 3.12 mm)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Approval Agencies	cULus, PSE	cULus, PSE	Identical
Packaging Configuration	Standard	Cut Tape (CT) & Digi-Reel®	Different
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both the 0456030.ERG and 0456030.ER are active, production-grade components manufactured by Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts should be based on procurement and supply chain requirements:

0456030.ERG: Standard packaging configuration. Use when standard procurement channels and inventory management practices are in place.
0456030.ER: Cut Tape (CT) and Digi-Reel® packaging. Use when automated assembly processes require tape-and-reel format or when higher inventory availability is needed (11,100 pcs in stock versus 720 pcs for the main part).

Both parts carry cULus and PSE regulatory approvals, ensuring compliance with international safety standards. Both are ROHS3 compliant and suitable for applications requiring environmental regulatory adherence. The choice between these parts does not affect circuit protection performance, thermal characteristics, or electrical behavior.

Frequently Asked Questions (FAQ)

Q: Can 0456030.ER be used as a direct replacement for 0456030.ERG in production?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format. If your assembly process accommodates Cut Tape and Digi-Reel® packaging, 0456030.ER is a direct substitute.

Q: What does "Cut Tape (CT) & Digi-Reel®" packaging mean?

A: Cut Tape refers to components supplied on continuous carrier tape that can be cut to length. Digi-Reel® is Littelfuse's proprietary reel format for automated pick-and-place assembly. This packaging is standard for high-volume SMD production.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts have identical current ratings (30 A), voltage ratings (125 V AC / 72 V DC), response time (Fast Blow), breaking capacity (100 A AC / 500 A DC), melting I²t (81), and DC cold resistance (0.00132 Ohms).

Q: Do both parts meet the same regulatory standards?

A: Yes. Both 0456030.ERG and 0456030.ER carry cULus and PSE approvals and are ROHS3 compliant.

Q: Which part should I specify for a new design?

A: Specify based on your assembly process. For automated SMD assembly with tape-and-reel capability, specify 0456030.ER. For manual or mixed assembly processes, either part is acceptable. Consult your procurement and manufacturing teams for supply chain optimization.

Q: Is there a difference in operating temperature range?

A: No. Both parts operate across the identical temperature range of -55°C to 125°C.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity concerns during storage or handling.

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