3JQ 7 Equivalent & Substitute Parts

Part Overview

The 3JQ 7 is a fast-blow glass cartridge fuse rated at 7 A, 350 V AC, and 140 V DC, designed for through-hole mounting in 2AG package format (5mm x 15mm axial). This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and maintenance. The substitute part 3JQ 7-R provides electrical and mechanical equivalence while maintaining active product status.

Substiute Parts

3JQ 7

Bel Fuse Inc.In Stock: 11803JQ 7 Datasheet

Current PartRFQ

3JQ 7-R

Bel Fuse Inc.In Stock: 7483JQ 7-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3JQ 7-R qualifies as a direct substitute based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Current rating: 7 A (exact match)
• AC voltage rating: 350 V (exact match)
• DC voltage rating: 140 V (exact match)
• Fuse type and response time: Cartridge, Glass, Fast Blow (exact match)
• Package format: 2AG, 5mm x 15mm axial (exact match)
• Mounting configuration: Through Hole (exact match)
• Breaking capacity: 100A AC, 150A DC (exact match)
• Thermal characteristics: Melting I²t of 46 (exact match)
• DC cold resistance: 0.01 Ohms (exact match)
• Operating temperature range: -55°C ~ 125°C (exact match)

Parameter Comparison

Engineering Selection Recommendations

The 3JQ 7-R is the appropriate selection for applications currently using the 3JQ 7. The substitute part maintains identical electrical performance, thermal characteristics, and mechanical compatibility. The 3JQ 7-R carries active product status, ensuring continued availability and supply chain reliability. Additionally, the 3JQ 7-R meets ROHS3 compliance requirements, whereas the original 3JQ 7 does not, making the substitute preferable for new designs and systems subject to RoHS regulations. Both parts carry equivalent regulatory approvals (CE, CSA, cURus, PSE).

Frequently Asked Questions (FAQ)

Q: Can the 3JQ 7-R be used as a direct replacement for the 3JQ 7?

A: Yes. The 3JQ 7-R is electrically and mechanically identical to the 3JQ 7 across all specified parameters, including current rating, voltage ratings, fuse type, package format, and thermal characteristics. Direct substitution is valid without circuit modification.

Q: What is the difference between the 3JQ 7 and 3JQ 7-R?

A: The primary differences are product status and compliance. The 3JQ 7 is obsolete and RoHS non-compliant, while the 3JQ 7-R is active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: The 3JQ 7 is supplied in standard packaging, while the 3JQ 7-R is supplied in bulk packaging. Both parts use the identical 2AG, 5mm x 15mm axial cartridge format and are compatible with the same through-hole mounting footprints.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both the 3JQ 7 and 3JQ 7-R carry CE, CSA, cURus, and PSE approvals, ensuring compliance with applicable safety standards.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across the range of -55°C to 125°C, providing thermal stability across industrial and commercial temperature environments.